ICPS 2017 - AISF · Booklet. ii. Welcome Address Dear participant, With nearly 200 contributions, the 32nd International Con-ference of Physics Students boasts one of the richest

ICPS 2017AbstractsBooklet

ii

Welcome Address

Dear participant,

With nearly 200 contributions, the 32nd International Con-ference of Physics Students boasts one of the richest scientificprograms ever.

We are very excited to get to know you and to hear aboutyour cutting-edge research, which spans nearly every subfieldof physics. ICPS is the perfect setting to talk to your peersabout the results of your studies and research in an environ-ment where scientific rigor is expected but formalities are set toa minimum. For many, an ICPS is the first occasion to presentresults outside of their research group. If this is indeed thecase, cherish the moment and go all out!

We are sure you’ll find many talks and poster presentationswhich will stimulate your interest and curiosity. Don’t forget tofollow up with questions and discussions, maybe at dinner oversome delicious food and wine! The exchange and discussion ofideas is of paramount importance for any scientific undertakingand it is at the very heart of ICPS too. During the 32nd edition,we hope to reach new highs in terms of intellectual engagementand participation.

You’ll make that happen!

The XXXII ICPS Organizing Committee

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Practical Information

Talks

Parallel sessions dedicated to oral presentations will take placein the morning (9:30-11:00) of August 10, 12 and 13 as wellas in the afternoon (15:00-16:30) of August 13. During eachtime slot, five different parallel sessions, i.e. five different pre-sentations, will be taking place. Each presentation will last12 minutes, with 3 extra minutes allocated for questions. Theparallel sessions will take place in rooms A1, A2, A3, B1 andB2. The specific location of the rooms can be seen on the mapbelow. You can find information about the time and locationof any presentation both in the table on the following pagesand next to each abstract in this booklet. At the end of thisbooklet you’ll also find an author index which should help youretrieve quickly information about presentations you would liketo attend.

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Poster Presentations

Two formal poster sessions will take place on August 8 (11:30-13:00) and on August 13 (17:00-19:00).

Every student presenting a poster should illustrate theirwork during both sessions. This is to ensure that your workhas the highest possible visibility and at the same time to al-low other participants to explore different concepts and ideasin depth.

In fact, the posters will hang in the Main Hall and adja-cent corridors throughout the week (from the beginning of thefirst poster session until the end of the second), thus allowingmultiple iterations of observation and analysis.

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Talks Timetable

On the following pages you’ll find a detailed timetable of alloral presentations.

You will notice that your presentations have been organizedaccording to their subfield. As any classification procedure, thisorganization is rather rigid and we were forced to make a choicefor many abstracts which sit at the edge of different areas. Insome instances the choice was dictated by organizational aswell as scientific purpose.

If you have any questions or concerns please do not hesitateto get in touch with us at [email protected].

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12

Contents

Welcome Address 1

Practical Information 3

Talks . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Poster Presentations . . . . . . . . . . . . . . . . . . 5

Talks Timetable 7

August 10, 9:30-11:00 . . . . . . . . . . . . . . . . . 8

August 12, 9:30-11:00 . . . . . . . . . . . . . . . . . 9

August 13, 9:30-11:00 . . . . . . . . . . . . . . . . . 10

August 13, 15:00-16:30 . . . . . . . . . . . . . . . . . 11

Talks 29

Astrophysics and Space Physics 31

Concept of Volatile Organic Compounds Analyzerfor ISS Atmosphere Monitoring (Anastasiya An-nenkova) . . . . . . . . . . . . . . . . . . . . . 31

Overview of the State of Research in the Field of Ex-oplanets (Erik Johnson) . . . . . . . . . . . . . 32

HabSim (Habitability Simulator) (Ozgur CanOzudogru) . . . . . . . . . . . . . . . . . . . . . 33

Photonic Lanterns: a breakthrough in spectrographdesign (Fraser Pike) . . . . . . . . . . . . . . . 34

Use of Virtual Reality applications in astronautstraining and other space-related activities(Alexandru Nistorescu) . . . . . . . . . . . . . . 35

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Temporal Evolution of Sunspot Groups (GabriellaZsidi) . . . . . . . . . . . . . . . . . . . . . . . 36

Looking for precessing quasar jets using high-resolution VLBI observations (Kristof Rozgonyi) 37

Sub-MCh white dwarfs as SN Ia progenitors (SabrinaGronow) . . . . . . . . . . . . . . . . . . . . . . 38

Investigation of the limb darkening coefficients bymodelling the transit light curves of eclipsing bi-nary stars (Sandor Kunsagi-Mate) . . . . . . . 38

Gamma-Ray Astronomy in the Lecture Hall (Jacque-line Catalano) . . . . . . . . . . . . . . . . . . . 39

Fluctuations in the early universe (Greg Anderson) . 40

Complexity in Various Inertial Reference Frames(Nikola Stupar) . . . . . . . . . . . . . . . . . . 41

The Gaia satellite (Jussi Hedemaki) . . . . . . . . . 42

Probing inflation with gravitational waves (PhilipSørensen) . . . . . . . . . . . . . . . . . . . . . 42

Biophysics and Medical Physics 45

Signatures of Mutational Processes Operative in Hu-man Cancer (Judit Borcsok) . . . . . . . . . . . 45

G-Quadruplex as an evolving target for cancer ther-apy (Lia Meladze) . . . . . . . . . . . . . . . . 46

Free Electron Dynamics in Biological Tissue (AdrianSalo) . . . . . . . . . . . . . . . . . . . . . . . . 47

Analysis of micro-dosimetric distributions usingmicro-pattern silicon devices (Juan Prieto-Pena) 48

Identifying Functional Cluster of Genes from EnergyLandscapes in Autoencoders for PersonalizedTherapy in Medicine (Jenny Yang) . . . . . . . 48

Fiber Optic Dosimeter: Study in Current and Count-ing Mode (Ana Jorge Goncalves) . . . . . . . . 49

Causality Analysis of Epileptic Signals (Ildiko Stark) 50

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Time-Resolved Photoion Yield Spectroscopy of Non-Volatile Biological Analogues (Stuart Crane) . 51

Observation of gaseous biomarkers concentrationsfound in human breath samples using photoa-coustic spectroscopy (Oana Daciana Botta) . . 52

The bioelectrical signals of the brain (Evelin Berekmeri) 53

Radical pairs and magnetosenses (Ana Milinovic) . . 53

Complex Systems 55

Kolmogorov complexity, the measure of understand-ing. (Andras Saradi) . . . . . . . . . . . . . . . 55

Criticality in natural systems and human activities(Shahab Bahreini Jangjoo) . . . . . . . . . . . . 56

Death and revival of chaos in dynamical systems(Balint Kaszas) . . . . . . . . . . . . . . . . . . 57

The Entropy of Economics: Calculating Economic In-equality through Statistical Mechanics (AnmolLamichhane) . . . . . . . . . . . . . . . . . . . 58

Computational Physics 59

Lattice Boltzmann Methods: First Clash (GrzegorzLukas) . . . . . . . . . . . . . . . . . . . . . . . 59

Numerical Integration in Physics - Parallelization Al-gorithms with OpenMP and CUDA (Robert Poe-naru) . . . . . . . . . . . . . . . . . . . . . . . 60

Developing and applying an effective implicit methodfor discrete dislocation dynamics simulations(Gabor Peterffy) . . . . . . . . . . . . . . . . . 60

Machine Learning in the CMS Experiment (JoonaHavukainen) . . . . . . . . . . . . . . . . . . . 61

Improved Model for Electron-surface Interactions inPIC/MCC Simulations of Capacitively CoupledPlasmas (Benedek Horvath) . . . . . . . . . . . 62

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Environmental and Atmospheric Physics 65

LEDs and their efficiency challenge (Wiebke Hahn) . 65

Effect of Geomagnetic Super Substorm at Low Lati-tude Stations (Binod Bhattarai) . . . . . . . . . 66

Thermo-graphic image processing on FPGA to testand characterize solar panels/photovoltaic mod-ule (Issam Bouganssa) . . . . . . . . . . . . . . 67

Fluid Dynamics 69

Soft body model for real time droplet simulation(Tomasz Bonus) . . . . . . . . . . . . . . . . . 69

CFD simulation to detect the pressure variationcaused by the propagation of a ship in shallowwater. (Abhishek Gupta) . . . . . . . . . . . . . 70

The role of compressibility in the velocity shear-induced self-heating mechanism (Giorgi Tsereteli) 70

Materials and Solid State Physics 73

Ab initio study of magnetic and magneto-opticalproperties of doped CdTe (Abderrahim Ait Raiss) 73

Preparation and Analysis of YIG Nanostructures(Maximilian Paleschke) . . . . . . . . . . . . . 74

Moire Method for Nanometer Instability Investiga-tion of Scanning Hard X-ray Microscopes (Jan-nis Dickmann) . . . . . . . . . . . . . . . . . . 75

Ultrafast Magnetic Imaging Using High HarmonicRadiation (Christina Nolte) . . . . . . . . . . . 75

Longterm developement of transient networks in anexperiment with dipolar hard spheres (Tom Du-mont) . . . . . . . . . . . . . . . . . . . . . . . 76

Dissipative stabilization of a dark soliton in an elon-gated Bose-Einstein-Condensate (Rene Ham-burger) . . . . . . . . . . . . . . . . . . . . . . 77

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Topological Chern number for Bose-Einstein Conden-sate (Tomasz Szo ldra) . . . . . . . . . . . . . . 78

Lowest-Lying Collective Frequencies of a Photon BECin Presence of Temporally Retarded Interaction(Enrico Stein) . . . . . . . . . . . . . . . . . . 78

Bosonic Systems in Optical Lattices (Marko Shuntov) 79

Plasmonic excitations in Au induced atomic wires onvicinal Si(hhk) (Zamin Mamiyev) . . . . . . . . 80

Surface Plasmon Polaritons in Topological Insulators(Dewan J. Woods) . . . . . . . . . . . . . . . . 81

Two and a Half Quasicrystal – the search for an oxidicthin-film quasicrystal from SrTiO3 on Pd(111)(Bettina Leibundgut) . . . . . . . . . . . . . . . 82

Investigation of 2-dimensional electron gases, a pos-sibility of generating conduction in insulators(Jacqueline Marie Borgers) . . . . . . . . . . . 83

2D materials in sustainable technology (Veera Jun-tunen) . . . . . . . . . . . . . . . . . . . . . . . 84

On the 3D Topological Insulator: Bi2Te3 thin films(Sofia F. Teixeira) . . . . . . . . . . . . . . . . 85

RF Sputtering and PECVD - a comparison(Octavian-Gabriel Simionescu) . . . . . . . . . 86

Determination of the atom-surface interaction Poten-tial for a Topological Insulator: 3He-Bi2Te3(111)(Michael Pusterhofer) . . . . . . . . . . . . . . 87

Simulation of high energy XPD-patterns for structuredetermination of surface and interlayer struc-tures of solids (Robert Rauter) . . . . . . . . . 88

Nonlinear acoustic wave generation due to thermo-electric effect in organic conductors (BiljanaMitreska) . . . . . . . . . . . . . . . . . . . . . 88

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Magnetic Field as a Tool to Control Transmission andPolarization Transformation in Layered Super-conductors (Tetiana Rokhmanova) . . . . . . . 89

Retroreflection from a Superconductor (Viktor Konye) 90Ultrafast Lasers & Femtochemistry or: How we can

make “Movies” of Molecules in Motion (SaschaRanftl) . . . . . . . . . . . . . . . . . . . . . . . 91

Betatron Radiation from Cryogenic Clustertargets(Andre Sobotta) . . . . . . . . . . . . . . . . . . 91

Modelling optical line shapes with multidimensionalTaylor Series (Nikodem Stolarczyk) . . . . . . . 92

Modeling Conductive Domain Walls by means of Ran-dom Resistor Networks (Benjamin Wolba) . . . 93

In-Plane Electronic Speckle Interferometry And Us-age in Shearography (Adrian Costa Boquete) . 94

Microstructure and mechanical properties ofultrafine-grained aluminum consolidated byhigh-pressure torsion (Peter Nagy) . . . . . . . 94

Designing Mechanical Metamaterials (Freek Broeren) 95

Nuclear Physics 97Products of exotic nuclei decay (Joanna Peszka) . . 97

Other Interesting Topics 99The story of Newton’s laws (Raimundo Sieso Ortiz ) 99The Medieval Trebuchet (Yannick Linke) . . . . . . 100It is two and a half minutes to midnight (Cecilia

Meneses-Ponce) . . . . . . . . . . . . . . . . . 100Calculating the simple pendulum’s period with the

given amplitude using the Gauss’ hypergeomet-ric function (Sarolta Cako, Olivera Vujinovic) . 101

Diamagnetism and Levitation (Bellona Bles) . . . . 102The Centripetal and Centrifugal Forces (Bishal Ban-

jara) . . . . . . . . . . . . . . . . . . . . . . . . 102

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From undergraduate student to PostDoc researcher;A(n) (un)typical evolution and development inscience (Dominik Utz ) . . . . . . . . . . . . . . 103

The Vulcanus in Japan Programme (Monika Schied) 104

Particle Physics 105Designing a particle accelerator - conditioning of cop-

per electrodes high-voltage dc pulses (Anton Sa-ressalo) . . . . . . . . . . . . . . . . . . . . . . 105

The problem of vacuum metastability within theStandard Model (Goran Jelic-Cizmek) . . . . . 106

Supersymmetric Beasts and Where to Find Them(Baptiste Ravina) . . . . . . . . . . . . . . . . . 107

The Large next-to-leading order Electroweak Correc-tion to e+e− → tt (Bianka Mecaj ) . . . . . . . 107

Anisotropic flow in heavy ion collisions (AlexandraNeagu) . . . . . . . . . . . . . . . . . . . . . . . 108

Scintillating Bolometer Monte Carlo for Rare ParticleEvent Searches (Nicholas Deporzio) . . . . . . 109

Coulomb-dissociation at Samurai detector (DavidHegedus) . . . . . . . . . . . . . . . . . . . . . . 109

Search for Z ′ in the dimuon channel with the CMSexperiment (Saverio Mariani) . . . . . . . . . . 110

Study of the CMS Phase 1 Pixel Pilot Blade Recon-struction (Tamas Almos Vami) . . . . . . . . . 111

Search for fully reconstructed decays of the W boson(Timo Eckstein) . . . . . . . . . . . . . . . . . 112

Navigating the Hidden Sector: Designing the SHiPExperiment at CERN (Oliver Lantwin) . . . . 112

Detector Fabrication for the Dark Matter in CCDs(DAMIC) Experiment (Ariel Matalon) . . . . . 113

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Physics Education 115

Activities of FYKOS for High School Students andits Educational Benefits for Participants (KarelKolar) . . . . . . . . . . . . . . . . . . . . . . . 115

Usage of digital technology instruments at educa-tional laboratories (Maria Katsiampa) . . . . . 116

Holograms teach you Physics (David Jacome) . . . . 117

Plasma Physics 119

Experimental examination of the effect of ResonantMagnetic Perturbation on the edge-plasma tur-bulence in fusion devices (Lilla Vano) . . . . . 119

Plasma facing materials in thermo nuclear fusion re-actors: retention of nuclear fuel (Bogdan Butoi) 120

Quantum Physics and Technology 121

Introduction to quantum correlations (Maria Gieysztor)121

The Components of an Integrated Quantum OpticsNetwork (Marco Canteri) . . . . . . . . . . . . 122

On-Chip Quantum Optics in One-Dimension: Sin-gle Molecules coupled to a Dielectric Nanoguide(Dominik Rattenbacher) . . . . . . . . . . . . . 122

Quantum Optics and Plenoptic Imaging (GiovanniScala) . . . . . . . . . . . . . . . . . . . . . . . 123

Optical space-time duality in quantum applications(Filip Sosnicki) . . . . . . . . . . . . . . . . . . 124

Squeezed light: Going beyond the quantum noise(Lamborghini Sotelo) . . . . . . . . . . . . . . . 125

Applications of ac+dc driven Frenkel-Kontorovamodel (Sonja Gombar and Nemanja Micic) . . 126

Asymmetric Quantum Systems in Strong Electromag-netic Fields as Terahertz Radiation Sources (Pi-otr G ladysz ) . . . . . . . . . . . . . . . . . . . . 126

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Microscopic System For High Power Laser Sport Di-agnose Using The Third Harmonic (PetrisorGabriel Bleotu) . . . . . . . . . . . . . . . . . . 127

Measuring the Intensity Profile of a Laser Focusby the Fluorescence of Quantum Dots (TobiasMesser) . . . . . . . . . . . . . . . . . . . . . . 128

Theoretical Physics 131Special Theory of Relativity and the Isotropy of the

Speed of Light (Micha l Dragowski) . . . . . . . 131Time, simultaneity and synchronization (Adrian Soly-

mos) . . . . . . . . . . . . . . . . . . . . . . . . 132Geometric description of Hamiltonian-constrained

systems (Aleksandra Sroda) . . . . . . . . . . . 133Ghost free actions in multimetric gravity (Daniel Blixt)133Causal Dynamical Triangulations Quantumgravity

(Daniel Nemeth) . . . . . . . . . . . . . . . . . 134The Hypothesis of Perpendicular Time (Manik Dawar)135The uncertainty principle for energy and time (Kasia

Budzik) . . . . . . . . . . . . . . . . . . . . . . 136Multipartite entanglement using matrix product state

approach (Mihaly Mate) . . . . . . . . . . . . . 136Symmetries and integrable systems (Mikheil

Sokhashvili) . . . . . . . . . . . . . . . . . . . . 137An introduction to supersymmetry (Jan Peter

Carstensen) . . . . . . . . . . . . . . . . . . . . 138Polyakov Loop extension to Yang-Mills Thermody-

namics (Valeriya Mykhaylova) . . . . . . . . . . 138Physical applications of Poisson and symplectic re-

ductions (Julia Lange) . . . . . . . . . . . . . . 139

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Poster Presentations 141

Astrophysics, Cosmology and Space Physics 143

Hα Categorization and Radial Velocities of Low MassStars (Erik Johnson) . . . . . . . . . . . . . . . 143

Probing inflation with gravitational waves (PhilipSørensen) . . . . . . . . . . . . . . . . . . . . . 144

An observational study on the origin of cosmic rays(Yigit Sonmez ) . . . . . . . . . . . . . . . . . . 144

Study of efficiency of the ORTEC Detective-EX-100T(Maria-Larisa Ganea) . . . . . . . . . . . . . . 145

X-ray Investigation of SNR Tycho Using ChandraAnalysis (Mustafa Bozkurt) . . . . . . . . . . . 146

Excitation of a Type-II radio bust during the earlyexpansion phase of a solar eruption (FedericaFrassati) . . . . . . . . . . . . . . . . . . . . . . 147

Spectrum of cosmological Stromgren spheres (AgnesKis-Toth) . . . . . . . . . . . . . . . . . . . . . 148

Automatic processing of gamma ray spectra(Alexandru-Ferencz Filip) . . . . . . . . . . . . 149

The Magellanic Group (Cristina Mier Gonzalez ) . . 150

The non-linear relation between X-ray and UV lu-minosity of Quasars: a new “standard candle”(Viola Gelli) . . . . . . . . . . . . . . . . . . . 151

Reheating after primordial inflation (Daniel Lozano) 152

XMM-Newton Study of Abell2597 (Isil Selcuk) . . . 152

Brightness Variation of Seven Young Sun-likeStars from Ground-based and Space Telescopes(Gabriella Zsidi) . . . . . . . . . . . . . . . . . 153

Biophysics and Medical Physics 155

Photoacoustic Imaging (Photoacoustic Image Forma-tion) (Cengiz Humeyra, Demirtas Dogu) . . . . 155

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Implantation of depth electrods in stereoencephalog-raphy (Felicia Mihai) . . . . . . . . . . . . . . 156

Numerical model of lysozyme protein nucleation andgrowth kinetics (Andrey Sokolovskiy) . . . . . . 157

Magnetic field reduction and its consequences. Ther-apy with magnets (Maria-Alexandra Nacu) . . 158

Identifying Functional Cluster of Genes from EnergyLandscapes in Autoencoders for PersonalizedTherapy in Medicine (Jenny Yang) . . . . . . . 159

Computational Physics 161Determining the structural properties of model fluids

by numerical solution of the equations of mo-tion for the Fourier coefficients of density fluc-tuations. (Bohdan Opryshko) . . . . . . . . . . 161

Effects of maximum node degree on computer virusspreading in scale-free networks (Omar Ba-maarouf ) . . . . . . . . . . . . . . . . . . . . . 162

C# as alternative language for computational physicsprojects development. (Bartosz Fidera) . . . . 162

Environmental and Atmospheric Physics 165Studying saharan dust intrusions using ceilometer

and satellite data over Romania (Daniela Zaharia)165The downburst phenomenon (Eetu Rimo) . . . . . . 166

Fluid Dynamics 167Pressure variation caused by the propagation of a

boat in shallow water. (Abhishek Gupta) . . . . 167

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Materials and Solid State Physics 169

Triple conducting oxides - synthesis, properties andapplications (Iga Lewandowska) . . . . . . . . . 169

Laser-induced Breakdown Spectroscopy on Contami-nated Soil Samples (Petrisor Gabriel Bleotu) . 170

Attosecond Pulse Generation Driven by IntenseChaotic Light (Anton Komarov, AnastasiiaVukolova) . . . . . . . . . . . . . . . . . . . . . 170

Laser-Interferometric Position Measurement for Scan-ning X-ray Microscopy (Valerija Music) . . . . 171

Magnetic properties and phase transition in transi-tions metal doped semiconductor (Younes Sbai) 172

CdTe nanowires: preparation and properties (Mela-nia Loredana Onea) . . . . . . . . . . . . . . . 173

Physical properties of proton irradiated MgB2 (AlinaMarinela Ionescu) . . . . . . . . . . . . . . . . 174

Development of a laser lithography system (AlvaroNodar Villa) . . . . . . . . . . . . . . . . . . . 174

Physical properties of NbSeI compound (Marta Roman)175

Floquet-Bloch description of non-adiabatic radiationdamage processes (Nicolo Forcellini) . . . . . . 176

Functionalized gold nanorods at air-water interface(Agnieszka Wiciak) . . . . . . . . . . . . . . . . 177

Comparative study of the effects of rare earth ionsdoped BiSrFeO3 nanomultiferroic (Maha Ayman) 178

Ferromagnetic nanoparticle of Ising spin-1 with a Ru-bik’s cube structure: Monte Carlo simulations(Kadiri Abdelmajid) . . . . . . . . . . . . . . . 179

Ultrathin colloidal CDSE nanoplatelets for black lightemitting devices (Tatiana Kormilina) . . . . . 179

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Synthesis, Characterization, Electronic and Opti-cal Properties of The New Double PerovskiteBaSrMgWO6: Theoretical and ExperimentalStudy (Abderrahman Abbassi) . . . . . . . . . . 180

Memories based on ion migration effect (Tomas Hrbek)181

Production and characterization of galwanotechnich-nical layers on the basis of chlorides and metalsblock D (Joanna Jab lonska) . . . . . . . . . . . 182

Synthesis and Characterisation of Metal-Silicon Ox-ides (Ewelina Nowak) . . . . . . . . . . . . . . 183

An Enhancement Of Photoluminescence From PbSQuantum Dots By LSPR In SemiconductorNanocrystals (Anton Babaev) . . . . . . . . . . 184

III-V racetrack microlasers with InAs/InGaAs quan-tum dot active region (Ildar Nabiullin) . . . . . 185

Dual Active Galactic Nuclei in Merging Galaxies(Gerard Valentı Rojas) . . . . . . . . . . . . . . 186

Band bending at surfaces and interfaces: metal-semiconductor contact. (Andreea Serban) . . . 187

Crystal growth and properties of binary intermetallicZrBi2 (Zuzanna Sobczak) . . . . . . . . . . . . 187

Assemblies of Thermoresponsive polymers moleculeshydroxypropylcellulose and methylcellulose in-vestigated by means of dielectric relaxation spec-troscopy (Andrii Ostapchuk) . . . . . . . . . . . 188

Fabrication of Ni(1.5 nm)/Cr(x nm)/Fe(2 nm) Mag-netic Multilayers by PVD and investigation onCr spacer thickness in oscillation exchange cou-pling (Kimiya Pakravanan) . . . . . . . . . . . 189

Structural Properties & Metal Distributions on Abell754 and Abell 520 (Oguzhan Colkesen) . . . . . 189

Current driven domain wall creation in ferromagneticnano-wires (Nils Sommer) . . . . . . . . . . . . 190

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Split & Delay Photon Spectroscopy with Visible Light(Verena Markmann) . . . . . . . . . . . . . . . 191

Materials in flatland: beyond graphene (AleksandraBojar) . . . . . . . . . . . . . . . . . . . . . . . 192

Linear dynamics for superfluid vortex formation: thecase of the “snake” instability of a grey solitonin a two-dimensional Bose-Einstein condensate(Alexej Gaidoukov) . . . . . . . . . . . . . . . . 193

Spectroscopic characteristics of metalloorganic com-plexes from the Fetriazole family of compounds(Ma lgorzata Rudnicka) . . . . . . . . . . . . . . 194

Scanning electron microscopy methods in study of mi-cro objects (Iuliana Taran) . . . . . . . . . . . 195

Density of states calculation with Wang-Landau al-gorithm (Ana Milinovic) . . . . . . . . . . . . . 196

Concept of Volatile Organic Compounds Analyzerfor ISS Atmosphere Monitoring (Anastasiya An-nenkova) . . . . . . . . . . . . . . . . . . . . . 196

Nuclear Physics 199Absolute differential cross section for elastic electron

scattering on Argon atom (Jelena Vukovic) . . 199

Other Interesting Topics 201The amazing life of Physics students in Portugal

(Melissa Serra) . . . . . . . . . . . . . . . . . . 201Classical musicians and Physics students: one pas-

sion, two worlds (Alfonso Lopo) . . . . . . . . . 202The Entropy of Economics: Calculating Economic In-

equality through Statistical Mechanics (AnmolLamichhane) . . . . . . . . . . . . . . . . . . . 202

Aramis: data science applied to cyber security (Da-vide Bernardi, Federica Bisio, Pierangelo Lom-bardo, Alan Perotti) . . . . . . . . . . . . . . . 203

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A multidimensional graph approach to workplace an-alytics (Davide Bernardi, Claudio Borile, Ric-cardo Rinaldi, Anna Velyka) . . . . . . . . . . . 204

Particle Physics 205

Navigating the Hidden Sector: Designing the SHiPExperiment at CERN (Oliver Lantwin) . . . . 205

Scintillating Bolometer Monte Carlo for Rare ParticleEvent Searches (Nicholas Deporzio) . . . . . . 206

Λb → J/ψφΛ decay and search for the exotic hadrons(Julia Tena Vidal) . . . . . . . . . . . . . . . . 206

Analysis of tt background production in H →W+W− → l+l−νν processes in the CMS ex-periment at LHC (Rudy Ceccarelli) . . . . . 207

Solar Neutrino Oscillations (Valentina Biancacci) . . 208

Physics Education 209

Physics Brawl, Online Physics Brawl and its Influenceon the Physics Education (Daniel Dupkala) . . 209

Quantum Physics and Technology 211

Basic Circuits of a Quantum Optics Network (MarcoCanteri) . . . . . . . . . . . . . . . . . . . . . . 211

Ultrafast Dynamics in a Quantum Fluid Environment(Sascha Ranftl) . . . . . . . . . . . . . . . . . . 212

Open quantum systems dynamics and measurementprocess (Guido Giachetti) . . . . . . . . . . . . 213

Bell’s inequality (Alessandra Beni) . . . . . . . . . . 214

Theoretical Physics 215

Minimal configuration in simplical quantumgravitywith toroidal topology (Daniel Nemeth) . . . . 215

Semiclassical descritpion of the triaxial rigid rotor(Robert Poenaru) . . . . . . . . . . . . . . . . . 216

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Constructive gravity in a nutshell (Florian Wolz ) . . 216The A-square problem and its relevance in the Dicke

superradiance (Francesco Bollati) . . . . . . . . 217

Author Index 219

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Talks

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Astrophysics and SpacePhysics

Concept of Volatile Organic Compounds Analyzerfor ISS Atmosphere Monitoring 12 Aug

10:15amA3Anastasiya Annenkova

Moscow Institute of Physics and Technology

International Space Station (ISS) Atmosphere is an isolatedand regenerated, as a result atmosphere contains many volatileorganic compounds (VOC). For example, compounds such asammonia, Freon or formaldehyde have a great negative im-pact on astronaut’s health. Therefore, a lot of timely controlon them in the atmosphere is required. Nowadays, astronautshave special absorbents for accumulation of harmful substanceswhile they are in the ISS. After the homecoming of astronauts,the absorbents were explored in the specialized laboratoriesusing gas chromatography and mass spectrometers. The ac-curacy of these methods is high, but their complexity and theneed for maintenance don‘t allow them to be used in the or-bit. The aim of this paper is the development of the ISS at-mosphere monitoring system. Spectrometric methods are themost useful for solving this problem. The main problem isthat the spectra of heavy organic molecules are not resolvedand overlapped. Therefore, it‘s necessary to provide a widespectral range (8-11µ) to effectively identify individual com-pounds. Usually this task is solved by Fourier spectrometers.

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But Fourier spectrometers, which can be used in the orbit,has too low spectral resolution (0,5 cm−1) to resolve individualnarrow spectral features. In this paper we propose to use cav-ity enhanced laser spectroscopy method using cavity quantum-cascade laser (EC-QCL). Modern quantum-cascade lasers canprovide a wide spectral range (8-11µ) for hundreds of millisec-onds. The laser line width doesn’t exceed a few megahertz,which provides a high spectral resolution (<0,001 cm−1). Itis also important to accurately measure the absorption of thecontinuum due to the overlapping of the compounds spectrumsover the entire spectral range. These are the reasons we aregoing to use cavity ring-down spectroscopy (CRDS) with aneffective optical path of 140-280 meters depending on the spec-tral range. It is early stage project and we present an opticaland general scheme of spectrometer, sensitivity estimates anddynamic range on the conference.

Overview of the State of Research in the Field ofExoplanets12 Aug

10:30amA3 Erik Johnson

University of Gottingen

In the last 20 years, since the discovery of the first exoplanetaround a main sequence type star, there has been a great pe-riod of discovery of new planets. Many of these planets areof types that had not even been considered before their dis-covery and do not exist within our own solar system. Someof these, such as Hot Jupiters, exist in areas of their systemsthat they could not have formed in and has resulted in ad-ditional research and understanding of how planetary systemsform. These planets have been discovered by an ever increas-ing variety of methods. The first, and still most used, method

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was that of high precision radial velocity measurements of theplanet’s parent star. The second, most popularized by NASA’sKepler mission, is the transit method. This method observesa star for a long period of time to see the periodic luminositydecrease of a planet moving in front of the star. Other meth-ods include gravitational microlensing, direct imaging and as-trometry. Each method has a particular set of planets thatis ideal for detection and reveals differing information aboutthese planets once discovered. Additionally each of these meth-ods can be affected by differing characteristics of the observedstar such as stellar activity influence on precision radial veloc-ity measurements. Taken together these factors have lead toa very informative distribution of discovered planets that stillhas significant observational biases. It is the hope of everyonein the field that upcoming missions and surveys, such as GAIA,JWST and CARMENES, will help to close some of these gapsand give us a better picture of the planetary distribution inour galaxy. Additionally in the last year there have been somemajor discoveries concerning potentially Earth-like planets inthe solar neighborhood.

HabSim (Habitability Simulator) 12 Aug10:45amA3Ozgur Can Ozudogru

Middle East Technical University

In this study, we have written a program which determines therange of the habitability zone of a star when given the StarType as an input. Program shows the range of the Habitabil-ity region and also when the user introduces planets revolvingaround the star that stated, before, our program plots the lo-cation and the 2D simulation of that star system and showshow many planets are in the region of Habitability. We have

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designed it to be an open source program so that future workcan be done by others.

Photonic Lanterns: a breakthrough inspectrograph design13 Aug

9:30amA3 Fraser Pike

Heriot-Watt University

As telescopes continue to increase in size, the need for fibre fedspectrographs is strengthened. High precision measurementssuch as the radial velocity technique can be affected by modalnoise in the fibre, causing lower than ideal resolving power. Thehybrid reformatter is a device, containing a photonic lantern,which takes the multimode point spread function of the tele-scope and converts it into a diffraction-limited slit of singlemodes, where modal noise should be absent. Unfortunately,this is not the case, and I will demonstrate the spectrograph Ihave constructed to characterise the modal noise. This spec-trograph can also show how agitation of the fibre can decreasethe level of noise.

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Use of Virtual Reality applications in astronautstraining and other space-related activities 13 Aug

09:45amA3Alexandru Nistorescu

University of Pitesti

In the last few years, the use of virtual reality technology devel-oped in an accelerated rhythm from one day to another and inthe present it offers new viewpoints on training and education.What the new visual immersive VR concept is actually doingis to place a person in a simulated environment that looks andreacts, up to a point, as the real world. Astronauts always re-ported disorientation and spatial memory difficulties while inspace, mainly because they orientation in space is based mostlyon visual, because the usual terrestrial cues to the vestibularorgans are absent. As a result they usually routes as a se-quence of memorised landmarks and turns but this methodfails in case of reduced visibility. Using VR and a 3D repre-sentation of the spacecraft subjects train in different visibil-ity conditions in order to be able to develop new orientationskills under new conditions. Another use of VR headset is tocounteract space motion sickness reported by astronauts dur-ing spaceflight, which is another effect of orientation difficultiesand vestibular system. In the present, what we are trying todo, using immersive VR and EEG headset is to place the sub-jects in different hazardous situations on the spacecraft andrecord their brain activity and capability to react in a properway and control the situation. This type of exercise can servein the future as a selection tool for space missions in order toidentify the suitable subject for the task.

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Temporal Evolution of Sunspot Groups13 Aug10:00am

A3 Gabriella Zsidi

Eotvos Lorand University

Sunspots are regions in the solar photosphere which havereduced temperature compared with their surroundings, mak-ing them appear dark when viewed in white light. A sunspotgroup typically consists of one or more compact spots. I usedthe daily records of sunspot groups from the last 150 years inorder to examine their temporal evolution, but I only includeddata when they satisfied the preset selection criteria. The vari-ation of the sunspot groups’ area was approximated with theskew normal distribution and I examined the relationship be-tween the paramters of the distribution. The parameters of thebest fit model were determined with the Marcov-Chain MonteCarlo method. The results show that the value of the n param-eter, that indicates the asymmetry of the evolution of sunspotgroups, is zero or around zero in the most cases, i. e. the evolu-tion is nearly symmetric. In the case of asymmetric evolution,the majority of the n values are positive, i.e. the tail on thedecay side is longer than on the growth side. The examina-tion of the temporal variation of the n parameter shows thatthere is no preferred period or location of appearance, wherethe symmetric evolution is more frequent.

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Looking for precessing quasar jets usinghigh-resolution VLBI observations 13 Aug

10:15amA3Kristof Rozgonyi


The innermost structure of radio-loud active galactic nuclei(AGN) can be directly studied with the technique of very longbaseline interferometry (VLBI). High-resolution VLBI imagingobservations reveal the geometry and the physical propertiesof relativistic jets emanating from the vicinity of the accretingcentral supermassive black holes. The physics of the jets isnot fully understood yet, thus the discovery of kinematicallyspecial, new sources is required to better understand the natureof jets.

Complementary VLBI observations of geodetic surveys areproviding many sources with unique, long-term observationalhistory. The International Celestial Reference Frame (ICRF)currently has nearly 300 defining objects which are mainlyquasars. The ICRF was redefined in 2009 (ICRF2) and itslist was extended with new sources. However, there were 39defining objects of ICRF1 which were left out from the sec-ond realization as they showed long-term positional instability.Nevertheless the VLBI observations of some of these sourceshave never been examined in the framework of jet kinematics.

In my presentation I will show the results of my analysis ofthe astrometric data of the 39 special handling sources and thekinematic analysis of the VLBI imaging observations for oneselected source.

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Sub-MCh white dwarfs as SN Ia progenitors13 Aug10:30am

A3 Sabrina Gronow

University of Heidelberg

Supernovae are the main contributers of iron in our galaxyand influence the galactic chemical evolution. The movingmesh code AREPO allows a parallel treatement of the occur-ing hydrodynamics and a nuclear network. It is used to simu-late the double detonation of a sub-Chandrasekhar mass whitedwarf as a possile progenitor of a Type Ia supernova. Differentinitial models are analysed for their evolution and final abun-dances in one and three dimensional simulations. An explosionin a double detonation scenario can lead to spectra and lightcurves that are in agreement with observations and thereby itcan give an insight into the origin of the elements in our galaxy.

Investigation of the limb darkening coefficients bymodelling the transit light curves of eclipsing

binary stars13 Aug10:45am

A3 Sandor Kunsagi-Mate


The so-called transit method is one of the most powerfultools of the exoplanet research. During a transit the planetcauses a decrease in the light intensity of its host star whatwe can measure directly. Nevertheless a lot of other factorscan also cause a change in the intensity-time diagram. Such afactor is the limb darkening, which is related to the intensitydistribution of the star. To reconstruct this phenomenon therewere created many stellar atmosphere models. However therewas found that the light intensity predictions of them don’t

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match to the observations, and they often contradict to eachother. These uncertainties can significantly influence the pa-rameters of exoplanets derived from transit method. The errorof the derived radius of the planet can be even 20%!

Regarding to these inconsistencies, the need has arised tospecify the limb darkening laws. During my work I have mod-elled the transit light curves of eclipsing stars observed byCoRoT space telescope, and I have determined the limb darken-ing coefficients for some binary systems using the four-parameterlimb darkening law. The final goal of the project is to createan empirical law that reconstructs the correct behaviour of thelimb darkening.

Gamma-Ray Astronomy in the Lecture Hall 13 Aug3:00pmB1Jacqueline Catalano

Friedrich-Alexander-Universitat Erlangen-Nurnberg

Cosmic ray physics became increasingly more advanced sinceits discovery by Viktor Hess in 1912. Very high energeticgamma-ray radiation is produced by cosmic rays arising from anumber of different sources in the universe. Examples for suchsources are active galactic nuclei or supernova remnants. Giv-ing students the unique opportunity to get experience handlinga gamma ray telescope and its data, a special and innovativelecture was introduced. Like this, the students get the chanceto work with an instrument that is used in research. The lec-ture includes observation nights with the FACT-telescope lo-cated on La Palma controlling the telescope remotely from thelecture hall. Following this, the students learn how to han-dle and analyze real data taken at the observation nights withmodern analysis techniques. Writing a report in the style of ascientific publication was a nice closure of the one-week block

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seminar. In this talk, I will review all the way from the intro-duction to ground based gamma ray astronomy with imagingair Cherenkov telescopes over analyzing steps to the interpre-tation of the data.

Fluctuations in the early universe13 Aug3:15pm

B1 Greg Anderson


In the very early stages of our universe there were tiny en-ergy fluctuations which led to the evolution and formation ofthe universe as we see it today. During the inflationary pe-riod when the universe expanded at an enormously large rate,the quantum fluctuations were stretched out past their eventhorizons where they appear to stop oscillating. When many ofthese fluctuations built up it created an energy landscape thatwas eventually responsible for the creation of stars and galax-ies. This talk will explain the origin and effect of the quantumfluctuations, and show simulations and models of the evolutionof the energy field during the inflationary period of time.

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Complexity in Various Inertial Reference Frames 13 Aug3:30pmB1Nikola Stupar

University of Banja Luka

In this paper, a new view on accelerated expansion of theuniverse is presented. Computational experiment was per-formed to simulate oscillator which was observed in two inertialreference frames (Σ and Σ′). Oscillator is a representation ofrotational motion of celestial bodies in one dimension. Oscil-lator’s equilibrium point is still in system Σ′. System Σ′ ismoving away from system Σ. Velocity is velocity of oscillator’sequilibrium point in system Σ. Velocity of oscillator’s equi-librium point in system Σ was calculated by using relativisticaddition of velocities. In our approximation, velocity is increas-ing in steps, so that there are time intervals in which systemΣ′ is inertial one. Cmp complexity defined by permutation andlinear combination is calculated for this series of velocity valuesin system Σ. Multiple plots are showing Cmp complexity forvarious oscillator’s parameters. Cmp complexity in system Σincreases when velocity between systems increases up to speedof light c, where it peaks. Accelerating expansion of the uni-verse is linked with arrow of time. Increasing Cmp complexityis consistent with direction of arrow of time, and it can beconcluded that the universe is expanding at accelerated rate.The special case was also observed in which velocity of oscilla-tor in system Σ was greater than speed of light c. If universeexpansion would be greater than speed of light c, time and co-ordinates in system Σ′ would become imaginary, and time insystem Σ would change it’s direction.

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The Gaia satellite13 Aug3:45pm

B1 Jussi Hedemaki

University of Oulu

In my talk I will discuss about the Gaia satellite, which waslaunched in 2013. The primary goal for the Gaia mission is tomake the most precise 3D-map of our galaxy. Over the durationof its 5-year mission, Gaia will survey over one billion stars, andgather important information from them. The data gatheredcan be used to study the formation of our galaxy, back whenit was young. Among many things, Gaia will help us find newplanets, brown-dwarfs, quasars and supernovae. First batch ofdata gathered was released late in 2016, and some of it hasbeen processed. I will use some of the data in my Bachelor’sdegree, and will talk about that too. I will also briefly discusshow the Gaia mission improved upon the Hipparcos mission,which launched in 1989. I have included an illustration of Gaia,which shows the modules and the sunshield.

Probing inflation with gravitational waves13 Aug4:00pm

B1 Philip Sørensen

University of Southern Denmark

We will investigate how precise models of inflation can be probedthrough the imprint of primordial gravitational waves in theCosmic Microwave Background (CMB). Gravitational wavesare generated by quantum fluctuations during inflation, withan amplitude proportional to the energy scale of inflation, andsubsequently imprinted in the polarisation of the CMB. Theaim of this presentation is to understand how precise measure-ment of the CMB polarisation can teach us about the energy

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scale of inflation, and to understand the precise physics in-volved in how gravitational waves gets imprinted in the polar-isation of the CMB. The presentation is based on a bachelorthesis written by Philip Sørensen and supervised by Martin S.Sloth of the Centre of Cosmology and Particle Physics, SDU.

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Biophysics and MedicalPhysics

Signatures of Mutational Processes Operative inHuman Cancer 10 Aug

9:30amB1Judit Borcsok

Eotvos Lorand University, Budapest

Today the individual fields of science do not terminate sharplyfrom each other, rather support each other. We can use theircombined knowledge and methods for tackling a wide varietyof problems, for instance carcinogenesis. In this field of studyphysicists work arm-in-arm with biologists and computer scien-tists to handle and analyse a large amounts of data gained fromDNA sequencing and to get a better insight into the patho-genetic mechanism underlying all cancers. The genome of acancer cell bears somatic mutations that are the cumulativeconsequences of the DNA damage and repair processes oper-ative during the cellular lineage from the fertilized egg to thefull-fledged cancer cell. Global sequencing initiatives are pro-viding catalogs of somatic mutations from thousands of can-cers, thus opening the door to decipher the signatures of mu-tational processes operative in human cancer. Through thecharacterization of mutational signatures, we may shed lightto the mechanisms and agents conducing to and protectingagainst cancer formation, which may be useful in preventionand development of more efficient treatment strategies. The

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talk wishes to summarize our current understanding of muta-tional patterns and mutational signatures and to briefly presentthe analytical method of deciphering the signatures of muta-tional processes.

G-Quadruplex as an evolving target for cancertherapy10 Aug

9:45amB1 Lia Meladze

Free University of Tbilisi

It is known that effectiveness on G-quadruplex DNA forma-tion at physiological conditions depends on ligands, which rec-ognize such sequences that form quadruplexes at presence ofmonovalent ions, the most effective one of which is K+. Thestructure of DNA G-quadruplex in vivo is determined not onlyby oligonucleotide sequence but also by monovalent ions andligand-recognizing molecules. In this work spectrometric CDand absorbtion methods were used to study the influence ofanticarcinogen compound TOEPyP4 porphyrin and Co ionson a thermodynamic stability of G-qudruplex-firming sequenceGGG(TGGG)3 . It was shown that by adding the slowlyincreasing concentration of TOEPyP4 porphyrin to the G3-quadruplex, it gets more thermally stable. On the other handCo ions unfold G-quadruplex and lessen its thermal stability.Van-Hof enthalpy at various concentrations of TOEPyP4, K+

and Co2+ has been determined for individual porphyrins, met-als and DNA, as well as their complexes.

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Free Electron Dynamics in Biological Tissue 10 Aug10:00amB1Adrian Salo


The dynamics of a cloud of interacting free electrons in abiological medium is currently poorly understood. Such anelectron cloud is known to generate free radicals which causesbiodamage, or the so-called secondary electrons might bind toproteins and molecules in the nearby cells and disturb theirfunctions. It occurs as one of the intermediary effects in ionbeam cancer therapy (IBCT), but primarily it is the subsequenteffects that have been investigated and modeled. In our bache-lor’s project, we aim to assemble and formulate a model for de-scribing the dynamics of free electrons in a medium, specificallybiological tissue. We explore what numerical codes are avail-able, and to what extend they may provide the features neededfor properly modeling the complexity arising from electron-electron interactions, and possibly electron-molecule interac-tions. The physics that govern the dynamics of the plasma(the electron cloud) covers a broad spectrum of fields such asmedical physics, i.e. in the form of IBCT, plasma physics, bio-physics, with its direct effects on cells and tumors, and com-putational physics.

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Analysis of micro-dosimetric distributions usingmicro-pattern silicon devices10 Aug

10:15amB1 Juan Prieto-Pena

University of Santiago de Compostela

The techniques of treating cancer using protons and heavyions are especially effective in radio resistant tumors. The char-acterization of the hadron beams’ radiobiological effects de-pends deeply on the knowledge of the microdosimetric energydeposition distributions associated to the trace structure of theionizing beam particles. By understanding such distributionsat cellular level the radiobiological efficiency or radiobiologicalaveraged dose required for treatment planning can be calcu-lated. New manufacturing techniques permit the constructionof silicon micrometre-scale instruments for the measurement ofthose distributions.

Identifying Functional Cluster of Genes fromEnergy Landscapes in Autoencoders for

Personalized Therapy in Medicine10 Aug10:30am

B1 Jenny Yang

University of British Columbia

In the pursuit of personalized medicine within oncology,growing attention is being given to machine learning for can-cer diagnostics and treatment. Because machine learning is atthe interface of theoretical physics and high-dimensional statis-tics, the accuracy and success of a model may not depend oncomputational power or algorithm complexity. Instead, it candepend on comprehensively understanding the theoretical dy-namics and energies of the data system itself. Our goal is to an-alyze the energy landscape of our autoencoder model, for pur-

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poses of determining which genes carry the most predictive in-formation in classifying different cancer types. We are trainingan autoencoder to perform dimensionality reduction on a set of17,688 genes in the human genome. The learning process findsweights over the training dataset that minimize a loss function.The loss function, derived from statistical physics, representsthe energy of the model. The training process aims to find aglobal energy minimum of the system. Looking at which hiddennodes have the strongest output signal, and performing pertur-bation analysis of these nodes against the input genes will helpus interpret predictive and discriminatory genes. While train-ing, we adjust the activation functions (e.g. sigmoid, standardnormal) and loss functions (e.g. cross-entropy, mean-squared)to better understand the energy landscape of our model, aswell as the characteristics of the training dataset. Understand-ing the theoretical underpinnings of our autoencoder model iscentral to determining which genes carry the most predictiveinformation for classifying different cancer types. This is a fun-damental task in our current research towards implementingpersonalized therapies in cancer.

Fiber Optic Dosimeter: Study in Current andCounting Mode 10 Aug

10:45amB1Ana Jorge Goncalves

University of Aveiro

In radiotherapy techniques, treatment quality is essential,which can be achieved by using in vivo dosimetry. In thissense, a prototype dosimeter can be used for brachytherapeu-tic applications, particularly for prostate cancer treatments.The dosimeter uses scintillating optical fibres, coupled with apolymethyl methacrylate (PMMA) optical fibre that guides the

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scintillation light toward the silicon photomultiplier. To assessits viability for dosimetry applications, we analysed compo-nents of the dosimeter and its overall behaviour. Initially, westudied the attenuation of PMMA fibres with the wavelengthof the scintillation light, results of which suggested that using ascintillating optical fibre with emission in the blue region is op-timal for configuring the dosimeter prototype. One advantageof this dosimeter is to permit its attachment to brachythera-peutic needles. By extension, we assessed the extent of the at-tenuation of BrachyStarr needles (by Bard Medical) and theirqualitative composition. We evaluated the dosimeter response,in current mode and counting mode, whose behaviour was lin-ear with the dose. On the other hand, we calibrated the dosime-ter using a commercial dosimeter (RaySafeTM Xi). We alsoconcluded that the dosimeter prototype has a higher energydependence for the current mode and the counting mode is amore reliable and precise method.

Causality Analysis of Epileptic Signals12 Aug9:30am

B1 Ildiko Stark


Epileptic seizures can cause epileptic seizures in other cells andbrain areas. Sometimes surgeries depend on which area is thesource and which are only affected by it. My presented work ad-dresses this question. An introduction to the Sugihara causalityanaysis is given, then a model of epileptic seizures is described,finally results of both simulated and measured data are shown.

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Time-Resolved Photoion Yield Spectroscopy ofNon-Volatile Biological Analogues 12 Aug

9:45amB1Stuart Crane


Gas-phase spectroscopic techniques provide a valuable insightinto the fundamental dynamics of biological chromophores fol-lowing ultraviolet (UV) absorption, free of intermolecular andsolvent effects. These rapid and efficient energy redistribu-tion processes are believed to be vital to the understanding ofbiological photoprotection. Many large molecules of interest,however, have low vapour pressures, with a tendency to decom-pose under vigorous heating, making gas-phase spectroscopydifficult. This talk introduces a soft thermal desorption tech-nique, incorporated within a time-of-flight mass spectrometer(TOFMS), facilitating studies of the UV-photoprotection innon-volatile model biological chromophores. Back irradiationof a thin metallic foil by a CW laser produces neutral plumesof the molecule of interest. Numerous biologically relevantmolecules will be discussed, including preliminary studies onuracil and thymidine.

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Observation of gaseous biomarkers concentrationsfound in human breath samples using

photoacoustic spectroscopy12 Aug10:00am

B1 Oana Daciana Botta

University Politehnica of Bucharest

Breath sampling has recently gained popularity amongst thetechniques used for monitoring disorders and diseases, as it is anon-invasive procedure and completely painless to patients. Ef-ficient breath analysis techniques include various spectroscopymethods, where the signals obtained can be used for molecu-lar identification and quantification. Studies have shown thatthere is a dependency between the concentrations of volatile or-ganic compounds(VOCs), found in exhaled air, and the patho-physiological status of the body. In this paper, the chosenmethod is photoacoustic spectroscopy (PAS), a technique inwhich the analysis of elemental concentrations is directly linkedto the detection of acoustic waves produced in the gas. Theprinciple of the effect is that an absorbent gas can produceacoustic waves, when it is subjected to an incident light beam.The PAC method will specifically be used for determining theconcentrations of the biomarkers ammonia and ethylene in breathsamples provided by patients suffering from type 2 diabetes.

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The bioelectrical signals of the brain 12 Aug10:15amB1Evelin Berekmeri


The functioning of the brain - as the muscle and heart func-tions as well - is accompanied by electrical signals. Nerve cells’membrane currents are going through the intercellular spaceand these potential changes can be measured on the body sur-face by electrodes - this is the base of electroencephalography.My research aims to examine the brain’s electrical activity inthe manner above. The signals of the experimental subjectsgenerated by various stimuli are recorded by an Emotiv Epoc+detector. Thus, information is obtained in a non-invasive way,mainly from the territory of the cortex and hippocampus.

Radical pairs and magnetosenses 12 Aug10:30amB1Ana Milinovic

University of Vienna

First a short overview of magnetosenses in animals willbe given. Secondly, ornithological indications for a photon-simulated magnetosensor in birds will be presented. Followingthis introduction, relation to quantum optics and entanglementwill be revealed. The idea of a radical pair mechanism willbe described, with proposed molecular system, and systemsdemonstrated as magnetosensors. How can this be studied onthe single-molecule level in matter-wave interferometry will bediscussed.

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Complex Systems

Kolmogorov complexity, the measure ofunderstanding. 10 Aug

9:30amA2Andras Saradi


Kolmogorov complexity also known as algorithmic entropyof a string or any mathematical object is the length of theshortest possible description of the object in some fixed univer-sal description language. The precise definition of a descriptionis given by an universal Turing machine. The existence of anupper limit of Kolmogorov complexity gives us a chance to ap-proximate this quantity even though determine this quantityis an uncomputable problem in general. After a brief introduc-tion to Kolmogorov complexity I will present its connection tothe scientific method and the application of this term in thetheory of data analysis and machine learning methods. I willdiscuss the misconceptions in the interpretations of Occam’srazor and how can we replace it with this more precise term toform a useful tool in our apparatus to understanding of nature.

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Criticality in natural systems and humanactivities10 Aug

9:45amA2 Shahab Bahreini Jangjoo

Shiraz University

What is criticality? Why is it important in many parts sys-tems? Criticality would be exposed in such systems that minordisturbances get replied by catastrophic events. In mathemat-ical point of view, when power-law scaling behavior appearedin a dynamical systems it is known as critical behavior. Thisbehavior is well defined by second-order phase transitions andcritical points in statistical physics. But what about naturalsystems like brain, weather, societies etc.? During the last cen-tury a lot of efforts and investigations have been done aroundthe complex systems and a large amount of clues on criticalityhave been reported in this area; But the missing part in naturalmechanisms was lack of external tuning control value. Natu-ral systems are self-organized to criticality which is known asSOCs. On the other hand, so far criticality is the only knowngeneral mechanism in complex systems. Inflation in markets,human brain activities and amount of CO2 releases in an area,etc. follows power-law distribution, which is the significantsign of criticality. This talk would be around the importanceof criticality in complex systems and its clues in natural onesespecially human brain and human behaviors.

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Death and revival of chaos in dynamical systems 10 Aug10:00amA2Balint Kaszas


We investigate the death and revival of chaos under the im-pact of a monotonous time-dependent forcing that changes itsstrength with a non-negligible rate. Starting on a chaotic at-tractor it is found that the complexity of the dynamics remainsvery pronounced even when the driving amplitude has decayedto rather small values. When after the death of chaos thestrength of the forcing is increased again with the same rateof change, chaos is found to revive but with a different his-tory. To characterize these dynamics, the concept of snapshotattractors is used, and the corresponding ensemble approachproves to be superior to a single trajectory description. Thedetails of this chaosnonchaos transition depend on the ratio ofthe characteristic times of the amplitude change and of the in-ternal dynamics. It is demonstrated that chaos cannot die outas long as underlying transient chaos is present in the param-eter space. These observations need to be taken into accountwhen discussing the implications of ”climate change scenarios”in any nonlinear dynamical system.

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The Entropy of Economics: Calculating EconomicInequality through Statistical Mechanics13 Aug

4:15pmA1 Anmol Lamichhane

Earlham College, USA

Have you heard of the 1%? Can we use thermodynamics andstatistical mechanics to predict and understand economic orother socio-political inequalities that leads to the creation ofthe 1% class? I present various statistical mechanics modelsthat could be used to better understand such inequalities.

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Computational Physics

Lattice Boltzmann Methods: First Clash 13 Aug3:00pmA2Grzegorz Lukas

University of Wroc law

Lattice Boltzmann methods (LBM) is a type of methodsfor fluid simulation used in computational physics. LBM usessimple dwo-step algorithm. In first step it calculates colli-sions while the second step is responsible for calculating propa-gation of the fluid. Currently theoretical base for LBM is pro-vided by Boltzmann kinetic theory. There is a substential num-ber of methods that belong to LBM type. The most widely usedis BGH (named after Bhatnagar, Gross and Krook, the threescientists who introduced it in 1954). Its success is caused bysimplic- ity and intuitiveness. A simple application of BGHwill be shown, as well as theoretical background and compari-son with other methods.

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Numerical Integration in Physics - ParallelizationAlgorithms with OpenMP and CUDA13 Aug

3:15pmA2 Robert Poenaru

University of Bucharest

Numerical integration is one of the most important topics inNumerical Analysis and also a must-have tool for physicistswhich work on various problems. It consists in finding numer-ical values for functions which can be very hard or even im-possible to integrate in an analytical fashion. There are manymethods for integration, each with its typical advantages anddisadvantages like complexity, time execution on the machineand so on. Parallelizing these programs can help reducing theamount of time required for computation, and also can helpto simplify the algorithm itself. In this work, few methods arepresented together with the developed code in C++, OpenMPand CUDA.

Developing and applying an effective implicitmethod for discrete dislocation dynamics

simulations13 Aug3:30pm

A2 Gabor Peterffy


Crystalline materials deform plastically due to the move-ment of linear dislocations in the crystal. The way how thesedislocations move or get stuck explains work hardening, sizeeffects, creep and several other technologically important phe-nomena, hence this is an actively investigated and developedsubfield of materials science.

Dislocations exhibit complex spatiotemporal dynamics dueto their long-range mutual interactions via their induced stress

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fields. The mathematical description of this system leads tostiff differential equations. Solving them with explicit meth-ods on long time scales is computationally rather demanding.Nonetheless, all the currently applied algorithms are based ondifferent explicit methods both in 2 and 3 dimensions. Al-though implicit methods are generally more suitable for suchproblems, because of the long-range interactions, the comput-ing cost can be even higher for a large number of simulateddislocations.

We developed a new implicit method, which decreases thesimulation run time efficiently in 2 dimensions with reducingthe complexity of the mathematical system using physical prin-ciples. Our in-depth analysis showed that, while keeping thesame numerical precision, the run time decreased with severalorders of magnitude. It is expected that it will facilitate simu-lations of larger specimens in the future.

Machine Learning in the CMS Experiment 13 Aug3:45pmA2Joona Havukainen

University of Helsinki

While the experiments at the Large Hadron Collider are collect-ing unprecedented amounts of particle collision data, the meth-ods of data analysis become increasingly important. Machinelearning algorithms offer a way to perform multivariate analysisin many different problems encountered in experimental highenergy physics. The amount of data and sophisticated simula-tion framework for the particle collision experiments gives anideal setting for various machine learning approaches. In thistalk I will present different examples of the analysis done inthe CMS Collaboration where machine learning plays a role.Starting from reconstructing the flight paths of the particles

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in the detector to selecting events that potentially contain newparticles beyond the Standard Model, the use of multivariateanalysis techniques that learn directly from the data and simu-lations offers a way of improving the accuracy and effectivenessof particle physics experiments.

Improved Model for Electron-surface Interactionsin PIC/MCC Simulations of Capacitively Coupled

Plasmas13 Aug4:00pm

A2 Benedek Horvath


Particle-in-Cell/Monte Carlo Collisions (PIC/MCC) sim-ulations provide a self-consistent kinetic description of capaci-tively coupled plasmas (CCPs), with which the spatio-temporaldistributions of various plasma parameters can be observedefficiently. The electron-surface interaction has a remarkableinfluence on the plasma parameters such as electron density,electron heating and ionization dynamics in CCPs. Despitethis, it is still common to describe this process in PIC/MCCsimulations in a simplified way by assuming that all electronsare absorbed after hitting the electrode or defining a constantprobability for electron reflection.

In this work I implement a realistic model for the electron-surface interaction based on Vaughan’s theory and previouslyapplied by Sydorenko. In this model four different processes aretaken into account when an electron hits the electrode: elasticreflection, inelastic reflection, true secondary electron emissionand absorption. Their probabilities are all energy and angulardependent.

I investigate CCPs in argon between SiO2 electrodes at lowpressure (0.5 Pa). I compare the results of simulations using

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the improved model with the ones assuming a constant 0.2elastic reflection coefficient. I also highlight the effect that thevariation of the voltage and the ion-induced secondary electronemission has on the discharge characteristics.

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Environmental andAtmospheric Physics

LEDs and their efficiency challenge 12 Aug9:30amA3Wiebke Hahn

TU Dortmund

Taking a look at today’s electricity consumption lighting ac-counts for approximately 20% depending on the country’s to-tal consumption. To enable significant reduction in electricityproduction and to gain maximum energy savings, solid-statelighting (SSL) is required to perform at the physical limitsof electricity-to-light conversion efficiency. That is one of thereasons why the pioneers Isamu Akasaki, Hiroshi Amano andShuji Nakamura were jointly rewarded with the 2014 Nobelprize in physics “for the invention of efficient blue light emit-ting diodes which has enabled bright and energy-saving whitelight sources”. However, nitride LEDs exhibit such high effi-ciency performances only when operated at low current densi-ties. But to penetrate the market delivering maximum energysavings with lower lamp costs (→ cost of ownership), LEDshave to work at high carrier injection. Operating at high car-rier injection causes a non-linear phenomenon, the so-calleddroop, which diminishes the internal quantum efficiency (IQE).So far, the fundamental causes of this efficiency droop have notbeen fully understood since there are several processes such asquantum-confined stark effect, Auger recombination and elec-tron overflow, where it could origin from. Additionally, to those

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processes Yuh-Renn Wu et al. showed in 2012 that the Indiumcontent inside the quantum well (QW) of LEDs fluctuates,which leads to strong disorder and localisation effects whichmight also decrease the IQE.

Effect of Geomagnetic Super Substorm at LowLatitude Stations12 Aug

9:45amA3 Binod Bhattarai

Tribhuwan University

Several phenomena like solar energetic particles, geomagneti-cally induced currents and ionospheric disturbances that cancause frequent radio and radar scintillations, failure of powergrids, disruption of navigation by magnetic compass and au-roral displays at much lower latitudes than normal in earthare associated with geomagnetic storms. Substorm occur morefrequently during a geomagnetic storm and one substorm mayfollow the previous before its completion. The geomagneticNorthward component (X) field of the four stations in the equa-torial and low latitude region were taken to study their vari-ations during super substorm events of April 05 2010, August24 2005 and November 24 2001. The location of stations ex-tends from Asia to South America across Africa. We studiedthe storm time (Dst) variations in the Northward component(X) of geomagnetic field at low latitude stations during supersubstorm events and to substantiate the results, wavelet trans-form and cross correlation techniques were used. We checkedthe correlation of Northward component (X) with Dst, SYM-H,Bz, X, Y and Ey individually to show that geomagnetic effectduring the super substorm events at low latitude is significant.The power regions with the maximum fluctuation were ana-lyzed using the continuous wavelet transform.

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Thermo-graphic image processing on FPGA totest and characterize solar panels/photovoltaic

module 12 Aug10:00amA3Issam Bouganssa

Mohammed V University

The importance of operating temperature solar/photovoltaicmodule for its electrical performance is well known, and theneed for fast and reliable in-situ monitoring techniques for PVfleet efficiency. Nowadays, these techniques are based notablyon ”data acquisition” classical measurement principles. Theseare time consuming and unreliable are when measuring equip-ment is not suitable and certified. The challenge for in situ reli-able, fast and accurate technique to adequately estimate a per-formance of the PV module is more than obvious. This paperexamines the relevant correlation between the operating tem-perature of an in situ PV module and its electrical performancerelative, they characterize by heat treating graphic pictures onFPGAs. The advantages and disadvantages of this techniqueare discussed in an effort to facilitate the process/maintenancemonitoring in applications of solar energy.

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Fluid Dynamics

Soft body model for real time droplet simulation 10 Aug10:15amA2Tomasz Bonus

University of Wroc law

Fluid simulations are complicated and computationally inten-sive, making them difficult to perform in real-time. Using ex-isting soft body model we can get a result which is very closeto the lifelike behaviour of single droplets. The main advan-tage of this method is that we perform simulation in real time,which makes easier to make changes in parameters of simula-tion without time-consuming calculations. This is achieved bybasing the model on simple thermodynamic laws and use ofClausius-Clapeyron equation to calculate pressure forces.

PV = nRT

Concept of this method is to use the pressure force acting oneach face of a closed surface of the model. Combining thisapproach with existing springmass engine we can simulate thebehaviour of single droplets in real time. I will present my im-plementation of the soft body model and test its basic physicalproperties. This can be used to quick simulations of the dropletin a porous medium, droplet bouncing on membrane vibratingwith variable frequencies or vein and artery problems causedby high-pressure blood flow

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CFD simulation to detect the pressure variationcaused by the propagation of a ship in shallow

water.10 Aug10:30am

A2 Abhishek Gupta

Institute Superior Tecnico, Lisboa

Intrusion detection is a vital problem for the border surveil-lance especially in shallow water. Underwater sensor networks(UWSNs) are the enabling technology for the intrusion detec-tion. The propagation of a ship creates a disturbance in thesurrounding region which causes the pressure variation. Thisvariation is the key to detect the ship. Using the ANSYS Fluentwe have designed an intrusion detection system by distinguish-ing the ship generated pressure fields. Simulation of ship flowin a river has been done with the non-linear shallow water waveequations which yields the potential function with which thepressure is calculated.

The role of compressibility in the velocityshear-induced self-heating mechanism10 Aug

10:45amA2 Giorgi Tsereteli

University of Tbilisi

In the present research we study the influence of compress-ibility on non-modally induced self-heating mechanism. Forthis purpose we study the set of equations governing the hydro-dynamic system. In particular, we consider the Navier-Stokesequation, the continuity equation and the equation of state,linearize them and analyze in the context of non-modal insta-bilities. Unlike previous studies in the Navier-Stokes equationwe include the contribution of compressibility, thus the bulk

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viscosity. By analyzing several typical cases we show that un-der certain conditions the second viscosity might significantlyreduce self-heating efficiency even if the mentioned viscosity issmall compared with the normal viscosity of a fluid.

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Materials and SolidState Physics

Ab initio study of magnetic and magneto-opticalproperties of doped CdTe 10 Aug

9:30amB2Abderrahim Ait Raiss


On the basis of ab-initio calculations, the magnetic propertiesof CdTe doped with transition metals Mn, Fe and co-dopedwith both, which make this material a possible candidate forspintronic applications, have been investigated. Moreover, thedensity of states (DOS) for different dopant concentrationshave been calculated and plotted with the energy diagram, westudied the experimental results of the doping of CdTe and de-termined which one is responsible of the magnetism appearing,Mn or Fe ,then we observed the effect of the co-doping with Mnand Fe. We found that the iron Fe does not contribute stronglyin the magnetism but affect the optical properties of the DMS,so in experimental work we find that a low concentration of Feimproves well the Faraday rotation, which is a magneto-opticalproperty. Furthermore, we have found that the studied sys-tem is either ferromagnetic or anti-ferromagnetic, according tothe difference in energy between the Disordered Local Moment(DLM) and the Ferromagnetic (FM) states. We also study theelectronic structure and the density of states, as to investigatethe microscopic behavior of electrons.

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Preparation and Analysis of YIG Nanostructures10 Aug9:45am

B2 Maximilian Paleschke

Martin Luther University Halle-Wittenberg

Everyone uses electronic devices to store and modify informa-tion, which are operated by an electric current. The generalapproach of reducing power consumption of these devices capi-talizes on reduced feature sizes. But this procedure is reachingits physical limits. One promising solution is the developmentof spintronic devices which transport information with the elec-tron’s spin rather than electron’s charge. Many different ma-terials are investigated around the world. The spin damping isone of their key restrictions. If the damping is low enough, aspin wave can propagate over long distances through such a ma-terial. An interesting candidate is Yttrium Iron Garnet. Thegroup for nanostructured materials at Martin Luther Univer-sity Halle-Wittenberg has developed an easy way of depositingYIG onto Gadolinium Gallium Garnet at room temperature us-ing Pulsed Laser Deposition. Heating the samples afterwardsyields to highly ordered YIG layers. The aim is now to createfree standing bridges of YIG in which a coupling between themagnons and phonons may occur. Foremost, this research re-quires an understanding of the spin dynamic in small rectangu-lar nanostructures. The talk will focus on the preparation andanalysis of such nanostructured samples. Additionally, spinwave simulations via mumax3 will be discussed.

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Moire Method for Nanometer InstabilityInvestigation of Scanning Hard X-ray Microscopes 10 Aug

10:00amB2Jannis Dickmann

TU Darmstadt

The resolution of scanning hard x-ray microscopes is definedby the synchrotron beam brilliance and available x-ray optics,which limit the ability to focus the beam. Today’s systems al-low a focal diameter of 10 nm and below. To achieve an equiv-alent resolution of this magnitude, the beam optics must bestable at few-nanometers with respect to the sample. At KTHRoyal Institute of Technology in Stockholm, a Moire methodwas developed to allow stability measurements. Using simpleoptical components and visible light, the technique can mea-sure the relative position of two reference points at several cen-timeter distance and with nanometer precision. The functionalprinciple behind the Moire method displacement measurementwill be presented as well as proof-of-concept stability measure-ments and applications for 3D nanotomography.

Ultrafast Magnetic Imaging Using High HarmonicRadiation 10 Aug

10:15amB2Christina Nolte

University of Gottingen, Germany

Images are an important tool in scientific research and provein an intuitive way the existence of the object or the physics dis-played. We perform magnetic imaging to investigate the mag-netic properties of thin films, heterostructures and nanoscalefeatures. In contrast to methods like magnetic force microscopy(MFM) we aim to perform magnetic imaging with nanometer

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spatial resolution and high femtosecond temporal resolution.We demonstrate the first nanoscale magnetic imaging employ-ing high harmonic radiation with circular polarization.

To obtain magnetic information in the recorded image, weexploit X-ray magnetic circular dichroism as a contrast mech-anism. The circularly polarized photons transmit through themagnetic sample. The sample modifies the magnitude and thephase of the electric field of the penetrating light depending onthe magnetization of the sample and the light helicity. Thus,we are able to image the local out-of plane magnetization ofthe sample only by transmission of the photons and recordingof the far-field diffraction pattern.

For this we need photons with circular polarization in theextreme-ultraviolet (EUV). High harmonic generation is a non-linear optical process which enables us to generate femtosecondEUV pulses by focusing an ultrashort laser pulse on gas atoms.

Longterm developement of transient networks inan experiment with dipolar hard spheres10 Aug

10:30amB2 Tom Dumont

Universitat Bayreuth

Permanent magnetic dipoles may self-assemble to linear chainsand rings. This has been investigated for nano-sized particlesin ferrofluids; Similar aggregates have also been observed in amixture of glass beads and magnetized steel spheres, which areshaken in a vessel. In the present contribution I focus on thestatistical longterm developement of transient networks in thissystem, when quenching the amplitude of the vibrations. Theobserved evolving networks are compared with the computersimulations of the Kantorovich Group, University of Vienna.

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The results can be useful in new nano-scale experiments on thecondensation of polymer materials.

Dissipative stabilization of a dark soliton in anelongated Bose-Einstein-Condensate 12 Aug

9:30amB2Rene Hamburger

Technische Universitat Kaiserslautern

A soliton is a stable solution of a non-linear time dependentwave equation in 1D for example the Gross-Pitaevskii equation(GPE) with the special property to maintain its intrinsic shapeand propagating with constant velocity. The GPE provides thetime evolution of a Bose Einstein Condensate (BEC) wherereduced local particle density is called gray soliton or in caseof zero particle density at its center, is called dark soliton witha phase jump of π. In our experiment we work with a BEC ofrubidium 87 of which we obtain a real space density image byusing the built-in scanning electron microscope (SEM). We tryto create a dark soliton with its characteristic phase jump ofπ, by exposing half of the BEC with a flattop optical potentialwhich we generate using a digital mirror device. Alternativelywe make use of the SEM to remove a certain amount of atomsfrom one half of the BEC since its wavefunctions time evolutiondepends on its chemical potential. The challenge to address isa solitons instability in 3D due to transverse excitation. Ouridea is to stabilize the soliton by local dissipation at its positionby utilizing the SEM.

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Topological Chern number for Bose-EinsteinCondensate12 Aug

9:45amB2 Tomasz Szo ldra

Jagiellonian University in Krakow

We show how to obtain the topological Chern number of thetopologically non-trivial Bose-Einstein Condensate trapped inan optical lattice. Time-of-flight atomic density distributionimages after release from trap are used for calculations withGerchberg-Saxton Phase Retrieval Algorithm. The analysis onsimulated data reveals that the method needs only a few mea-surement points for initial system momenta in the first Bril-louin zone, making it convenient for experimental use.

Lowest-Lying Collective Frequencies of a PhotonBEC in Presence of Temporally Retarded

Interaction12 Aug10:00am

B2 Enrico Stein

University of Kaiserslautern

Usually, collective mode frequencies of BECs are theoreticallydescribed for an instantaneous two-particle interaction betweenthe bosons. Recent experiments on photon BECs show, how-ever, that the effective photon-photon interaction is signifi-cantly influenced by memory effects which are presumably dueto diffusion processes. Therefore, we analyse the lowest-lyingcollective modes of a two-dimensional BEC in presence of atemporally retarded interaction by solving the underlying Gross-Pitaevskii equation with a variational approach. We find thatthe frequencies for both the breathing and the quadrupolemode are shifted for a few percent with respect to a non-retarded two-particle interaction. Furthermore, we find the

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same order of magnitude for the violation of the Kohn the-orem, i.e. the dipole-mode frequency differs from the trapfrequency. Finally, we discuss how these retardation effectscan be enhanced in an anisotropic harmonic confinement. Allthese findings are essential for determining the photon-photoninteraction strength from measuring the lowest-lying collectivefrequencies of the photon BEC.

Bosonic Systems in Optical Lattices 12 Aug10:15amB2Marko Shuntov

“Ss. Cyril and Methodius” University

This work explores the behavior of many-body bosonic sys-tems in optical lattices. The significance of the optical latticesin the study of many-body quantum theory, their construc-tion and their interaction with atoms are presented, along withsome current researches in the field. The Bose-Hubbard modelis presented, and the hopping (J) and interaction (U) termsare calculated as a function of the lattice potential depth (V0)for isotropic and anisotropic square lattices using the quan-tum harmonic oscillator approximation. The hopping term Jis calculated for different sites of the lattice and a comparisonbetween lattices of different dimensions are given. A simplemodel of two spin zero bosons in two sites is presented. Agood qualitative agreement between the presented model andthe references is obtained.

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Plasmonic excitations in Au induced atomic wireson vicinal Si(hhk)12 Aug

10:30amB2 Zamin Mamiyev

Leibniz Universitat Hannover

Metal-induced atomic wires obtained by self-organization onregularly stepped Si surfaces have attracted great interest be-cause of their potential to study exotic quantum phenomenain 1D physics, such as charge density-waves, non-Fermi liquidbehavior as well as plasmonic excitations. Depending on themisorientation against high symmetry directions, regular ar-rays of straight steps and narrow terraces of well-defined widthare generated, while the geometry of steps and metal concen-tration allow the formation of a single or double atomic chainper terrace. The collective electronic behavior undergoes a dra-matic change when the geometry is restricted to quasi-1D andelectrons in such systems are strongly correlated. Here we il-lustrate the variability of these systems by a study plasmonicexcitations in Au wires on Si(553) and Si(557) surfaces. SPA-LEED was used to control the long-range order of these sur-faces. Then plasmonic excitations were investigated via EELSwith an instrument that provides both high energy and mo-mentum resolution. During my talk, I will give more insightinto effects of every structural building block on plasmon dis-persions.

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Surface Plasmon Polaritons in TopologicalInsulators 12 Aug

10:45amB2Dewan J. Woods

Purdue University

Surface Plasmon Polaritons (SPPs) are localized electromag-netic wave excitations that travel along a metal-dielectric in-terface. Excitation of such waves is heavily dependent uponthe form of the dielectric permittivity functions of the respec-tive materials. This theory-based talk will be dedicated to anoverview of SPPs in different interface configurations and theassociated boundary conditions. Discussions will also includehow the properties of SPPs change when we consider the inter-face of Dirac materials, topological insulators (Tis) in particu-lar. A TI is a quantum material that behaves as an insulatorin its interior, but possesses conducting surface states – thusthe electrons are confined to move only along the surface. SPPpropagation in this exotic material has great promise for po-tential applications in quantum plasmonics devices and it isexpected to give great insight into the field of topology as itrelates to the growing field of photonics

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Two and a Half Quasicrystal – the search for anoxidic thin-film quasicrystal from SrTiO3 on

Pd(111)13 Aug9:30am

B2 Bettina Leibundgut

Martin-Luther Universitat Halle

Ultra-thin perovskite films exhibit extraordinary complex struc-tures on Pt(111) in the two-dimensional limit. Upon reduc-tion by UHV annealing, two-dimensional oxide quasicrystal orclosely related periodic approximant structures have been re-ported for BaTiO3 and SrTiO3 on Pt(111). Here we reporton the formation of similarly complex structures from SrTiO3

on Pd(111). The films are grown by reactive molecular beamepitaxy from a Nb-doped SrTiO3 single crystal and a Ti rod.In the evaporation process we have noticed the necessity of aTiO2 precursor. We have characterised this structure and com-pared it to the well-known TiO2 structures on Pt(111). Whenapproaching stoichiometric SrTiO3 films, several large unit cellsuperstructures are observed, that will be discussed with re-spect to aperiodic structures.

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Investigation of 2-dimensional electron gases, apossibility of generating conduction in insulators 13 Aug

9:45amB2Jacqueline Marie Borgers

Peter Grunberg Institute, Forschungszentrum Julich GmbH, Julich,Germany

By the formation of a 2-dimensional electron gas (2DEG) atthe interface of two electrically insulating oxide thin-films a 2-dimensional conducting channel is created. This can be usedfor e.g. for transistor components.I investigate the interface between LaAlO3 and SrTi03. Thereason for the formation of the 2DEG is different if the lay-ers are crystalline or amorphous. In both cases LaAlO3 isdeposited on SrTiO3 by pulsed laser deposition (PLD). Crys-talline films are deposited while using high temperature (700◦C),which makes it possible to grow atomic layer by layer, whichcan even be observed in real time by electron diffraction (RHEED).In case of crystalline films the formation of the 2DEG is a con-sequence of electrical reconstruction at the interface. Apartfrom that, in the amorphous case, the formation is based onlattice defects in the SrTiO3, which can be created by oxygenvacancy defects.The aim of my master thesis is to understand the depth profileof this lattice defects in the amorphous case. Various experi-mental techniques are used for example Hall-measurements toanalyse the electrical properties (even at 2K) or AFM and XRDfor the crystal structure.

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2D materials in sustainable technology13 Aug10:00am

B2 Veera Juntunen

University of Oulu

We are living in the turning point of technology. First two-dimensional material was found in 2004, and since then thisresearch field has grown enormously. Two-dimensional materi-als are one atom thick layers which can be easily removed fromlayered materials. Layered materials are classified by extendedcrystalline planar structures held together by in-plane covalentbonds and out-of-plane van der Waals forces.

Material’s properties change as their size approaches nanoscale.Thus, many of known 2D materials have interesting properties.Now we are able to build new types of quantum heterostruc-tures by stacking dissimilar 2D layers. We can choose thoseproperties what we want to have and adjusting the angle be-tween two atomic lattices can result in structures with differentproperties.

2D materials span the full range of electronic propertiesand we have the possibility to build various electronic deviceswith high performance and low power consumption. Theoret-ical analysis has shown that the skin effect is diminished inmultilayered graphene, and semiconducting TMDs have manydesirable properties for low-power devices.

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On the 3D Topological Insulator: Bi2Te3 thinfilms 13 Aug

10:15amB2Sofia F. Teixeira

University of Porto

Topological insulators (TI) appeared as a new type of ma-terials, characterized by an insulating bulk with a protectedmetallic state on their surface. 3D topological insulators haverecently been the focus of researchers due to their exotic the-oretical interest and possible applications. One of the recentlydiscovered 3D TI was Bi2Te3, which has a single Dirac coneon its surface. To study the TI properties of Bi2Te3, the fab-rication of epitaxial and impurity free thin films is essential.The transport properties of TI are also of great interest, dueto the difficulty in observing the protected metallic state innormal measurements. In this presentation, an overview of themultifunctional properties of Bi2Te3 will be presented, with fo-cus on the recent development and study of its TI properties.The fabrication of Bi2Te3 thin films is going to be discussedand how to measure its TI properties through transport mea-surements is being presented. Finally, preliminary results oftransport properties of Bi2Te3 thin films will be presented.

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RF Sputtering and PECVD - a comparison13 Aug10:30am

B2 Octavian-Gabriel Simionescu


Thin film deposition techniques have evolved greatly in thelast century and their diversity grew exponentially. Each de-position technique has its own advantages and disadvantages.They are divided into two large categories. There is Chemi-cal Vapor Deposition (CVD) and Physical Vapor Deposition(PVD). For CVD we have a wide array of techniques: atomiclayer deposition/atomic layer epitaxy (ALD/ALE), chemicalbeam epitaxy (CBE), metal-organic chemical vapor deposition(MOCVD), metal- organic vapor phase epitaxy (MOVPE) andplasma enhanced chemical vapor deposition (PECVD). For thePVD we have: Cathodic Arc Deposition, Electron beam phys-ical vapor deposition, Evaporative deposition, Pulsed laser de-position, Sputter deposition and Sublimation sandwich method,the most common used being Thermal Evaporation and Sput-tering. We will concentrate our attention on RF MagnetronSputtering and PECVD, which are fundamentally a PVD pro-cess and, respectively, a CVD process. The main depositedfilm that we focus on is SiO2 on a Si wafer. Regardless that weare talking about deposition time, film uniformity, depositiontemperature and so on, both deposition techniques have theirstrengths and weaknesses, and they are presented as found,either observed during the process or after it through a char-acterization method.

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Determination of the atom-surface interactionPotential for a Topological Insulator:

3He-Bi2Te3(111) 13 Aug10:45amB2Michael Pusterhofer

Graz University of Technology

Materials with peculiar electronic surface effects such as thenovel group of topological insulators pose an especially inter-esting topic for truly surface sensitive measurement methodssuch as helium atom scattering (HAS). Since the diffractiveinteraction of low-energy atoms with surfaces depends on amultitude of parameters, the total interaction profile betweenthe helium atom and the surface under investigation must beknown with a high degree of certainty. Although several atomscattering experiments have been performed on topological sur-faces, surface preparation of complicated layered materials isdifficult at best and angular scattering spectra are therefore of-ten too noisy to gather important surface parameters. Recent3He diffraction experiments from in-situ cleaved single crys-tals of Bi2Te (111) revealed a multitude of distinct resonancefeatures in between the diffraction peak maxima. Using the an-gular positions of these features and an extended analysis overseveral measurement cycles, we were able to identify ten dis-tinct bound-state energies of the 3He-Bi2Te3 (111) interactionpotential. Using these eigenvalues as the source for a potentialfit, a full three-dimensional interaction profile can be fitted toan azimuthal scan via an extended close-coupling (CC) calcu-lation. Modelling the scattering intensities via an elastic CCcalculation provides a quantum mechanically accurate way oftesting a provided interaction profile against measured inten-sity data. With our fitting procedure we obtain an accuratethree-dimensional 3He-Bi2Te3 (111) interaction profile whichwill pave the way for a better understanding of topological in-

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sulator surfaces.

Simulation of high energy XPD-patterns forstructure determination of surface and interlayer

structures of solids13 Aug3:00pm

B2 Robert Rauter

TU, Dortmund

Photoelectron diffraction (XPD) is a powerful tool to exam-ine surface and interlayer structures of solids. In order to ex-tract the structural information from the experimental data,simulated XPD patterns are compared to experimental XPDpatterns. For determining the correct structure a multiplic-ity of different surface and interface layer structures must beconsidered within the simulation. Reducing the quantity ofsimulations is achieved by utilizing a genetic algorithm.

Nonlinear acoustic wave generation due tothermoelectric effect in organic conductors13 Aug

3:15pmB2 Biljana Mitreska

Ss. cyril and methodius university

We investigate the nonlinear electromagnetic-acoustic transfor-mation (EMAT) in a quasi-two-dimensional organic conduc-tors arising from the thermoelectric effect. Magnetic field andangular dependencies of the generated acoustic wave are ob-tained under the condition of a normal skin effect when a sourceof thermoelastic stresses is the time dependent Joule heating.When an electromagnetic wave of frequency ω is incident onthe surface of the conductor, whose symmetry axis does not

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coincide with the normal to the surface, nonuniform tempera-ture oscillations appear due to the thermoelectric effect whichinduce acoustic oscillations with double frequency 2ω in theconductor. A comparison with the inductive mechanism ofEMAT is made in order to determine the conditions at whichthe thermoelectric mechanism is dominant over the inductiveone in the presence of a magnetic field. This will allow new im-portant information on the electronic structure of the organiclayered conductors to be obtained.

Magnetic Field as a Tool to Control Transmissionand Polarization Transformation in Layered

Superconductors 13 Aug3:30pmB2Tetiana Rokhmanova

O.Ya. Usikov Institute for Radiophysics and Electronics

Layered superconductors represent periodic materials, inwhich thin superconducting layers are separated by the thickerinsulator ones and are electrodynamically related to each otherby means of intrinsic Josephson effect. Such structures sup-port propagation of waves of terahertz frequency range, whichmakes them interesting for terahertz electronics. On the otherhand, studying the interaction of strong terahertz pulses withlayered superconductors may reveal new possibilities for high-temperature superconductive state control. The talk presentsboth general information about layered superconductors fam-ily and a specific problem solved for such structures. In theproblem, the effect of the external static magnetic field on theelectromagnetic waves transmission and transformation in lay-ered superconductors is studied. It is shown that even weakmagnetic field can change significantly the conditions for thewaves propagation in layered superconductors. Because of this,

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changing the DC magnetic field, one can vary the transparencyof the sample in a wide range or switch the sample from thestate with partial polarization transformation to the state withtotal polarization transformation, and vice versa.

Retroreflection from a Superconductor13 Aug3:45pm

B2 Viktor Konye


At an interface between a superconductor and a normal metalthe so called Andreev retroreflection can occur. This is a chargetransport process where two normal electrons are transferred tothe superconductor as a Cooper pair. After the charge transfera hole is retroreflected from the interface. The talk will out-line the theoretical aspects of understanding the phenomenain the framework of the Bogoliubov-de Gennes model. Afterthat numerical results will be shown calculated using the kernelpolynomial method.

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Ultrafast Lasers & Femtochemistry or: How wecan make “Movies” of Molecules in Motion 13 Aug

4:00pmA3Sascha Ranftl

University of Technology, Graz

In 1999 Ahmed Zewail won the Nobel Prize for the very firstdirect observation of a molecules’ dissociation using laser pulsesof a few hundred femtoseconds. In this talk I will give a shortintroduction into ultrafast lasers: how a so-called FROG usesautocorrelation and the diffraction of the laser with itself totake a “picture” of the pulse, why we need a sophisticated ex-perimental setup to access sub-picosecond time scales and howwe can use it to directly observe quantum particle dynamics,i.e. shooting a “movie”, demonstrated with an example ondissociation dynamics in acetone.

Betatron Radiation from Cryogenic Clustertargets 13 Aug4:15pmA3Andre Sobotta

Heinrich Heine Universitat, Cologne

Batatron radiation can be produced in tabletop experimentsfrom wakefields in Laser Plasma interaction, which in futurecan be a affordable alternative to big accelerator facilities, mak-ing hard X-rays acessible at university laboratories. Masslim-ited Targetmaterials such as nanometer sized cryogenic Clus-ters can be used to increase conversion efficency. Simulationsand an experimental setup for from my current PhD work willbe presented.

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Modelling optical line shapes withmultidimensional Taylor Series13 Aug

9:30amB1 Nikodem Stolarczyk

Nicolaus Copernicus University

One of the most important branch of molecular spectroscopyis modelling of spectral line shapes. Not only it is useful forscience itself, like testing if the theoretical descriptions of theway the molecules interact are correct or creating spectroscopicdatabases , but also can be applied to analyse human breath-ing, atmospheric measurements of the distant planets or ultra-accurate meteorology, e.g., exact determination of the Boltz-mann constant. The more exact results are demanded, themore accurate models need to be implemented. In general,the molecular collisions should be taken into account whichmakes the line shapes enormously complex. It is describable bythe transport-relaxation equation, nevertheless, it is extremelycomplicated to solve it exactly because of multidimensional in-tegrals, making numerical attempts either time demanding ornot accurate enough. The goal of the talk is demonstratinganother way of solving the transport-relaxation equation. Inopposite to brute-force methods, the new way to tackle thisproblem is to calculate the value of function and its derivativesonly once and expand this into a global solution using Taylorseries. Despite having some drawbacks, the method is very ef-ficient and has a potential for a wide implementation in futureresearch.

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Modeling Conductive Domain Walls by means ofRandom Resistor Networks 13 Aug

9:45amB1Benjamin Wolba

TU Dresden

A random resistor network is an electrical network of ohmic re-sistors, for which the electrical resistivity of a single resistor israndomly determined according to a certain resistance distribu-tion. They are not only intrinsically interesting from the elec-trotechnical point of view. Moreover they are also quite usefulfor modeling electronic transport in systems with phase sep-aration, like in composite media or in manganites undergoingan insulator-metal-transition, as well as in lower dimensionalsystems such as graphene or even DNA-strings. Here the ran-dom resistor network approach has been employed to model theconductivity of domain walls in uniaxial ferroelectrics, such aslithium niobate LiNbO3. Recently the inclination angle distri-bution of a domain wall in lithium niobate has been measuredlocally by Godau et al., using a Cerenkov second-harmonic gen-eration method for 3-dimensional domain wall mapping. Thisdata has been used as experimental input for a random resis-tor network model - addressing the electronic transport alongthe domain wall for different boundary conditions. The sim-ulation results are directly compared to local-scale transportmeasurements conducted by means of conductive atomic forcemicroscopy

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In-Plane Electronic Speckle Interferometry AndUsage in Shearography13 Aug

10:00amB1 Adrian Costa Boquete


This project is focused on certain shearing interferometrytechniques, derived from speckle interferometry. First, thespeckle phenomenon and some of its most important charac-teristics will be introduced. The next point will be the furtherexamination in speckle interferometry and its application inthe direct measure of displacement derivatives (shearography).Then the experiment performed, in which a shearing interfer-ometer is implemented, will be explained. The ease to pick thedirection in which the strains in a tense flexible membrane canbe measured will be shown. Last, the size of the speckle grainwill be calculated using results extracted from the experiment.

Microstructure and mechanical properties ofultrafine-grained aluminum consolidated by

high-pressure torsion13 Aug10:15am

B1 Peter Nagy

ELTE

Coarse-grained aluminum powder with 99.95 wt.% purity wasconsolidated by high-pressure torsion (HPT) technique at roomtemperature using a low carbon steel powder holder. In thisprocess, the powder experiences a semi-constrained conditionbecause the internal wall of powder holder can expand underthe load applied during HPT. After 4 turns of HPT a rela-tive density of 99.83% was achieved. The microstructure wascharacterized by electron backscatter diffraction and X-ray line

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profile analysis. It was found that the grain size decreased whilethe dislocation density increased with both increasing the dis-tance from the disk center and the number of HPT turns. Thesmallest grain size and the maximum dislocation density withthe values of 0.41µm and 6.8 × 1014m−2, respectively, wereachieved at the periphery of the disks processed for 4 turns.Tensile tests showed that consolidation of Al powder by 4 turnsof HPT yielded a high ultimate tensile strength and a good duc-tility (∼ 373 MPa and ∼ 22%, respectively). It turned out thatdislocations are the main reasons of the high yield strength inthe present Al samples. This study demonstrates the capabilityof HPT technique for processing consolidated Al powder withhigh strength and good ductility.

Designing Mechanical Metamaterials 13 Aug10:30amB1Freek Broeren

Delft University of Technology

Recently, there has been an increasing interest into materialswith mechanical properties that can be tailored no by changingthe chemical composition, but by applying a microstructure. Inthis way, material properties can be achieved that are not foundin nature, such as negative Poisson’s ratios, vanishing shearandbulk moduli or highly anisotropic elastic moduli. A great num-ber of these materials have been investigated and published,but up to now, the design of these structures seems to relymostly on intuition. In this talk, I will present an approach todesigning mechanical metamaterials using pseudo-rigid body(PRB) models. These models allow the designer to design thekinematics of the materials without having to consider all theelastic properties of their constitutive materials. This leadsto an analytically solvable system that can be iterated quickly,

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without the need for finite element simulations. By adding tor-sional springs to these models, even the stiffness of the eventualmaterial can be modeled and tuned to the required behavior.By using PRB models to design mechanical metamaterials, thedesigner can use the well-established toolbox used in the designof linkages, enabling a more rational design approach.

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Nuclear Physics

Products of exotic nuclei decay 13 Aug10:45amB1Joanna Peszka

Wroc law University of Science and Technology

Interesting issue in the field of nuclear physics of low-energy isstudy of exotic decays. Exotic nuclei are the artificially pro-duced isotopes, which lie near the border of stability and be-cause of the considerable disparity between the number of pro-tons and neutrons in the nucleus they decay by β+ channel.Created nucleus could be in excited state and after proceed toa lower energy state by emission of a proton. Such a reactionis called β-delayed proton emission. Usually the reactions arefound by detection of γ quanta, but in the case of decay of ex-otic nuclei, where radiation is not emitted, a different techniquemust to be used. The detection of delayed proton system iscalled OTPC (Optical Time Projection Chamber), it is a driftdetector with an optical readout. During the speech mecha-nism of β-delayed proton emission and the construction andoperating principle of the detector OTPC will be discussed.

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Other InterestingTopics

The story of Newton’s laws 10 Aug9:30amA1Raimundo Sieso Ortiz

UNED

Galileo and Newton were the parents of modern science but it issaid that both stood on the shoulders of giants. So, who werethose giants? From Aristotle to Newton, there is a fascinat-ing voyage though the sea of Physics and Philosophy. Aristotlebegan with his Looney Tunes-like world and the medieval schol-ars used this as a starting point to develop their ideas. We willlearn about William of Ockham and his forma fluens and aboutBuridan and his flux formae. Furthermore, the latter inventedthe idea of impetus, a very similar concept to the modern lin-ear momentum! We will finish with the Merton calculators andwith Oresme, who developed a system to draw qualities, theancestor of the cartesian axes

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The Medieval Trebuchet10 Aug9:45am

A1 Yannick Linke

Dasy

The trebuchet is a battle machine used in the Dark Ages tolaunch heavy payloads at enemies. It was preferred over acatapult due to larger range and higher accuracy. However, dueto its many components, the physical description is surprisinglyrich and complex.

It is two and a half minutes to midnight10 Aug10:00am

A1 Cecilia Meneses-Ponce

Universidad Autonoma Metropolitana (Campus Iztapalapa),Mexico.

Throughout the history of humanity, physics has given usthe greatest discoveries, creations and hopes for a better world.However, the development of physics also gave us a few yearsago (after World War II) one of the most important life lessonsfor humanity, and it was the understanding of the fragility oflife on our planet. When scientists responsible for the creationof atomic bomb noticed the destructive potential of nuclearweapons and their consequences, many of them came togetherto demonstrate against their use, so they created the Bulletin ofthe Atomic Scientists in whose front page the famous Dooms-day clock first appeared, with the passage of time has changedthe place of the hands with respect to the position of the mid-night, reminding us how close we could be to terminate with“everything”. Other parameters like climate change, biosecu-rity, nuclear energy and others are also currently considered toadvance or delay the time of the clock. So if the development

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of science was part of all this, it is also part of the solution andof course physics represent a wonderful opportunity to improveour world.

Calculating the simple pendulum’s period withthe given amplitude using the Gauss’

hypergeometric function 10 Aug10:15amA1Sarolta Cako, Olivera Vujinovic

University of Novi Sad

It is well-known that in many structures in nature, a systemsettles at a minimum of energy and undergoes oscillations orvibrations about it. Pendulum is seemingly a very humble andsimple device. It represents a great example of rotational mo-tion of a mass hanging from a fix point by a taught masslessstring of certain length. In the equation of motion of this sys-tem it is usually assumed that sin θ is small enough to makethe substitution sin θ = θ. This means that the width of thependulum’s swing – amplitude must be very small. But, whatif our pendulum wants to experience some freedom and excite-ment? Since we do not want to cut the string, the only thingthat can be done in order to accomplish this is to let the pendu-lum have bigger amplitude. Consequently, the aforementionedapproximation cannot be used. Luckily, Gauss’ hypergeometricfunction is there to save the day!

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Diamagnetism and Levitation10 Aug10:30am

A1 Bellona Bles


Throughout time people have always been intrigued whitevery form of flying and still are trying to bring it to reality, indifferent forms. Thus as the ultimate form of flying levitationwas indeed mysterious and as a phenomenon it can be explainedand put in applications today. In my 12 minuets I would liketo explain the physics behind real levitation witch comes formthe diamagnetic property of the material and why we call thisform of levitation a “real levitation” as well.

The Centripetal and Centrifugal Forces10 Aug10:45am

A1 Bishal Banjara

Tribhuwan University

It has been long time (nearly three centuries), when IsaacNewton had first derived the only and only existence of cen-tripetal acceleration/force in circular motion within the uni-form magnitude of tangential velocity, in his book “Principia”.This brought a controversial issue in different experiments andrejected to use the term “centrifugal” acceleration/force in suchcircular motion, presuming that all that sort of force is only thefictitious, not real force discarding our daily life experiences.But due to lack of proper mathematical framing, such physicalexperiences remained just as a fictitious or a pseudo experi-ence. This paper is all about the validation of ω2r (V 2/r)as a real mathematical as well the physical form that corre-sponds to both radial centripetal acceleration, ω2rr and realtangential acceleration, ω2rθ (a simple step derivation, but ascientific breakthrough) in circular motion within the uniform

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magnitude of tangential velocity, verifying the real existence ofcentrifugal acceleration/force but varying in both magnitudeand direction scale.

From undergraduate student to PostDocresearcher; A(n) (un)typical evolution and

development in science 13 Aug3:00pmA1Dominik Utz

Karl-Franzens University

After uncountable many ICPS participations it might havecome the time to give some review about the personal andscientific evolution over a period of more than 10 years. Thuswe will have a look not only into the science of the solar mag-netism, and here especially on small-scale features known asmagnetic bright points (MBPs), but also mix this interestingscientific research with some annecdotes of personal develop-ment, travelling, fun, and hopefully some hints of how to makea living in science and research.

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The Vulcanus in Japan Programme13 Aug3:15pm

A1 Monika Schied

University of Graz

In the framework of Vulcanus in Japan (ブルカヌス・イン・ジャパン), a scholarship programme for European stu-dents of engineering and science, I have been living in Japanfor one year, learning the language and working at NTT BasicResearch Laboratories.Of course, moving abroad is a big challenge and therefore in-convenient; the prospect of having to learn a language likeJapanese even frightening (it is easier than you expect). Ex-changing your familiar surroundings with a country where youcannot even read the labels in the supermarket needs a hugeamount of courage.However, the EU-Japan Centre for Industrial Cooperation or-ganising the Vulcanus programme offers reliable support in allimportant aspects of your life in Japan. Furthermore, sincethere are tens of other participants with the same schedule,the same problems, and the same questions, you are not alone.Therefore, the adventure loses its threat and you can fully en-joy your new life.Studying the language, working in a company and exploringthe country in the spare time provides a unique insight intothe rich Japanese culture. Looking back, I can highly recom-mend a stay abroad. Keep in mind:井の中の蛙大海を知らず – A frog in a well does not know thegreat sea.

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Particle Physics

Designing a particle accelerator - conditioning ofcopper electrodes high-voltage dc pulses 10 Aug

10:45amB2Anton Saressalo


The lifetime and new discoveries of the Large Hadron Colliderin CERN will come to an end during the 2020’s, and its replace-ments are already being designed. One of the main competitorsis a Compact LInear Collider, CLIC - an over-50-km-long lin-ear structure accelerating electrons to high energies. As CLICuses large radio-frequency electric fields of over 300 MV/m toaccelerate the electrons, the accelerating structures need to beable to sustain high stresses. Finding the right materials forthis task has been challenging. Currently, copper is the mostpromising material, but electrical breakdowns between copperblocks have been causing problems. This work aims to un-derstand the atomic scale phenomena behind the breakdowns,and to find the correct conditioning and treatment methods tominimize their amount. Discrete Dislocation Dynamics simu-lations are run in parallel with experimental DC pulsing mea-surements to allow connection of the microscopic phenomenato the macroscopic observations.

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The problem of vacuum metastability within theStandard Model12 Aug

9:30amA2 Goran Jelic-Cizmek

University of Geneva

With the recent discovery of the Higgs boson at the LHC, theStandard Model of particle physics has been completed. As-suming that no new physics emerges between the electroweakscale (∼ 100 GeV) and the Planck scale (∼ 1019 GeV), it hasbeen shown that the Standard Model effective potential ex-hibits an instability at energy scales higher than ∼ 1011 GeVdue to renormalization group flow of the Higgs quartic couplingλ. This seems to indicate that our current vacuum state couldbe a false vacuum, separated by an energy barrier from a truevacuum. Owing to quantum tunneling however, the currentstate could only be metastable, and may in fact one day decayto the true vacuum. While the idea of false-vacuum tunnel-ing has been explored in the past, with the absence of any newphysics at current high-energy experiments, it has been gainingnew attention in the recent years. It has been suggested thatcertain high-energy phenomena in the early universe, such asinflation and primordial black holes, could trigger the decay. Inthis talk, I will briefly go over the effective potential calculationfor the Standard model to show how the instability arises inthe large-field regime, and describe its main features, followedby an overview of the semiclassical theory behind vacuum de-cay in flat as well as curved spacetime. Finally, I will presentthe numerical results obtained for the decay rate in a curvedbackground for some simple geometries, with and without anon-minimal coupling of the Higgs field to gravity.

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Supersymmetric Beasts and Where to Find Them 12 Aug9:45amA2Baptiste Ravina

University of Sheffield

In this (hopefully) accessible talk, I’ll give insights as to howwe do experimental particle physics, by looking at the exampleof the search for the supersymmetric partner to the top quarkin hadronic final states at the ATLAS experiment. But what issupersymmetry? How does a detector work? How do we lookfor things we cannot see? What are the latest news from Run2 of the LHC? – these are the questions I’ll try to answer, andmore.

The Large next-to-leading order ElectroweakCorrection to e+e− → tt 12 Aug

10:00amA2Bianka Mecaj

University of Paris-Saclay

In this work we address the subject of large next-to-leadingorder (NLO) electroweak correction to the process e+e− → tt.We try to understand the origin of this large contribution byusing the GRACE-loop software to perform the NLO calcu-lations. Our technique of approaching the problem consists inanalyzing the differential cross section angular distributions fordifferent initial and final state polarizations and in addition in-vestigating contributions from different Feynman diagrams. Inthe first task we extract the cosine dependence of the angulardistributions when NLO corrections are included and comparethem with the tree-level angular distributions. Secondly weseparate the diagrams in a gauge-invariant way and seek tounderstand from which group of diagrams the large correctioncomes from. A particular attention is given to the box diagram

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when the W boson is in the loop. Our work is of special interestfor the future International Linear Collider (ILC) where polar-ized initial states will be accessible and the process e e+e− → ttcan be studied in details to confront the findings of our work.

Anisotropic flow in heavy ion collisions12 Aug10:15am

A2 Alexandra Neagu


Heavy ion collisions at relativistic energies are an experimen-tal method to study the structure of the matter and its be-havior under extreme conditions of temperature and density.Nowadays, one of the main goals of nucleus-nucleus collisionsat high energies is to study the quark gluon plasma in whichthe quarks and gluons are no longer confined. One observablewhich is used to characterize the properties and the evolutionof this new created medium is the anisotropic flow. In thiswork I present the measurements of different coefficients of theanisotropic flow for inclusive particles in nucleus-nucleus colli-sions using simulated data.

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Scintillating Bolometer Monte Carlo for RareParticle Event Searches 12 Aug

10:30amA2Nicholas Deporzio

Northeastern University

This study uses the Geant4 physics simulation toolkit to char-acterize various scintillating bolometer constructions for poten-tial experimental commissioning. Emphasis is placed on detec-tor sensitivity to neutrinoless double-beta decay. Constructionsminimally include a scintillating source material for the decayand an absorber material. Tellurium, Selenium, Germaniumand other candidate isotopes are studied as source materials.Various background discrimination techniques are analyzed in-cluding reflective housings and anti-reflective coatings upon thesource material. Different geometric optimizations are consid-ered. Ability to discriminate incident alpha and beta radiation,as well as photon detection efficiency for each construction ispresented.

Coulomb-dissociation at Samurai detector 12 Aug10:45amA2David Hegedus

Eotvos Lorand Tudomanyegyetem

In my presentation I present the first part of the evaluation ofan experiment of the Samurai detector system of the RIKENabout the Coulomb-dissociation of 15C. The Coulomb-dissociationis a much studied electromagnetic interaction which has a sig-nificant role the research of astrophysical processis and in thestructure of exotic nuclies. I detail what preparations areneeded from the detailed understanding of the detector systemto the final physical datas that can be used in the evaluation.

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The main goal was precise analysis of the relative momentumvector between the fragment and the emitted neutron.

Search for Z ′ in the dimuon channel with theCMS experiment13 Aug

9:30amA2 Saverio Mariani

Universita degli studi di firenze

Nowadays, describing the fundamental fermions constituing mat-ter and the bosons carrying forces, the Standard Model (MS)is the most complete theory of our knowledge. Nevertheless,some theoretical evidences and sperimental results convince usit is not complete and an extension is required. Among themodels proposed, some introduce vectorial bosons’ copies atthe TeV mass scale called Z ′ and W ′. Previous searches dur-ing the LHC Run 1 in the dimuon Z ′ → µ+µ− and dielectronZ ′ → e+e− channels gave some exclusion limits to the process’cross section. Now, with the improvement of the collisions’energy from 7-8 TeV to 13 Tev, more mass’ intervals can bestudied, even if the integrated luminosity is low. The follow-ing work presents a search for Z ′ using data collected by theCMS experiment during 2015 for a total integrated luminosityof Lint = 2.67fb−1. The pp collisions correspond to a

√s = 13

TeV energy in the centre of mass system. Then, two models areused to data’s interpretation: the narrow width approximation,where the Z ′’s width is thought negligible, and the full widthapproximation, where it is linear with its mass. In the secondcase, some Z ′ particles are produced off shell, i.e. with dif-ferent masses from the expected. So, considering the dimuonchannel, in this thesis I chose events with the dimuon mark(respecting some request on isolation and transverse impulse)

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and reconstruct the invariant mass, so that the signal is dis-tinguishable from background. Then data are compared withMonteCarlo simulations for the signal at different Z ′ massesand exclusion limits are calculated. In particular, the signalis obtained from a smearing procedure according to the CMS’efficiency and resolution curves. The events’ counting indeed isdone in a 2σ interval, being σ the experimental resolution, cen-tered on the mass points. Finally, using Poissonian statistics,the definitive exclusion limits are obtained. At 95% confidencelevel, Z ′ is excluded for masses lower than 3023 GeV.

Study of the CMS Phase 1 Pixel Pilot BladeReconstruction 13 Aug

9:45amA2Tamas Almos Vami


The Compact Muon Solenoid (CMS) detector is one of twogeneral-purpose detectors that reconstruct the products of highenergy particle interactions at the CERN LHC. The siliconpixel detector is the innermost component of the CMS track-ing system. The Phase 1 Pixel Upgrade is in preparation forinstallation after the LHC Run in 2016. During Long Shut-down 1 a third disk was inserted into the present forward pixeldetector with eight pilot blades constructed using the new dig-ital Read-Out Chip and a prototype readout system. Testingthe performance of these pilot modules enables us to gain expe-rience with the CMS Pixel Phase 1 Upgrade modules. In thisessay the simulation and the data reconstruction of these newmodules is presented.

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Search for fully reconstructed decays of the Wboson13 Aug

10:00amA2 Timo Eckstein

Friedrich-Alexander-Universitat Erlangen-Nurnberg

Currently only the leptonic decay channel of the W boson isused for its mass reconstruction. This is mainly the case due tothe comparable clear discrimination criteria as well as branch-ing fraction of ≈ 30%. In this work we look into pure-hadronicelectronically charged low-multiplicity W boson decays. Wefound in the conducted simulation that they are as rare as 1pb and only applicable via the usage of many channels. Thuswe determine that they won’t become stochastically relevantfor the LHCb data before the end of 2018 when the stochasti-cal error will be 15 MeV. Despite this, the aforementioned veryspecific decay class might nevertheless be interesting in the fu-ture because of its full re-constructibility while the HL-LHCupgrade can make them statistically better accessible.

Navigating the Hidden Sector: Designing theSHiP Experiment at CERN13 Aug

10:15amA2 Oliver Lantwin

Blackett Laboratory, Imperial College of Science, Technology &Medicine, London

Particle physics is stuck at an impasse: We have found noth-ing but the Higgs, and Supersymmetry (SUSY) is nowhere tobe found. But the neutrino masses, dark matter and the factmatter overcame anti-matter to create the universe, prove thatthere has to be new fundamental physics, and that there haveto be new particles, somewhere. But they have not been foundat the Large Hadron Collider (LHC), nor has anything been

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seen by direct detection experiments for dark matter nor byprecision tests of the standard model (SM). And without anenergy scale to target the justification for any new collider isweak. So where else can we look? The Search for Hidden Par-ticle (SHiP), is a proposed experiment to study a wide range ofmodels invisible to our current experiments. To test these mod-els with super-weakly interacting particles we need to solve anexperimental contradiction: We need to achieve an extremelylow background environment, while working at extremely highintensities. How we can overcome this experimental challengeand is the main topic of this talk

Detector Fabrication for the Dark Matter inCCDs (DAMIC) Experiment 13 Aug

10:30amA2Ariel Matalon

University of Chicago

There is clear evidence for non-baryonic dark matter, whichcomprises about 25% of the energy density of the universe.One of the major candidates for dark matter is the WIMP,or Weakly Interacting Massive Particle, which is yet to be de-tected. Dark Matter in CCDs (DAMIC) is an experiment de-signed to directly detect WIMPs by utilizing the bulk silicon ofscientific-grade charge-coupled devices (CCDs) as target massfor coherent elastic scattering. The current phase of the ex-periment consists of 675 µm-thick CCDs developed at LBNLbased on a design for the Dark Energy Survey Camera. Thedetectors have a low energy threshold and ability for particleidentification, as well as 3D position reconstruction of eventsdue to lateral spread of charge diffusion. The next phase ofthe experiment will require increased target mass to scale upthe overall exposure of the detector and carve out additional

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parameter space of WIMP cross section in the low mass range.One of my primary efforts is to design and fabricate CCDsof record-thickness at the Pritzker Nanofabrication Facility atthe University of Chicago. I will present initial results from theongoing efforts to develop such devices.

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Physics Education

Activities of FYKOS for High School Studentsand its Educational Benefits for Participants 13 Aug

3:30pmA1Karel Kolar

Charles University

This contribution shows a wide range of activities for highschool students organized by FIKOS. It describes its goals andachievements and benefits of its activities for participants withspecial emphasis on the core FYKOS activities (correspondencecompetition and camps). FYKOS is the only Czech memberof IAPS. Organizers (= members) of FYKOS are universitystudents. Participants are mostly high school students, some-times even younger gifted pupils. FYKOS can be translatedas Physics Correspondence Competition. This is the first andcore activity of our group which has been organized for 30 yearsnow. The correspondence competition consists of six series ofeight problems each school year. Organizers release problemsassignments (in Czech and in English) on the web pages ofFYKOS. Participants have time to solve these tasks. Partici-pants send solutions by online upload or by post. Organizerscorrect solutions, send them back to participants and releasethe list with awarded points to participants. The best partic-ipants are invited to camps. Camps are held twice a year fora week. Such week consists of rich expert program concerningphysics, mathematics and related topics. Camps are also fullof informal program many different games for development ofdifferent key competences.

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Usage of digital technology instruments ateducational laboratories13 Aug

3:45pmA1 Maria Katsiampa

University of Crete

This talk presents a research on digital and analog educationallaboratory instruments, and their importance to university stu-dents and researchers. Based on their technological properties,there are two types of instruments that can find application inan educational electricity laboratory, analog and digital. Whenanalysing analog and digital technology, we refer to the signalsthat each type of instrument uses. To compare these two typesof instruments we measured the voltage of an RLC circuit usingan electric oscilloscope of both technologies. In this experimentthe importance of high quality digital laboratory instrumentsis obvious, as analog instruments fail to reproduce the laws ofphysics accurately. It is important for students and researchersto be able to understand the way their experiment works andprocess their data at any time. Beyond university laboratoriesit is even more important for research centres to have mea-surement instruments with high accuracy, low energy drawingand big data processing possibility, as these instruments arein charge of producing measurements that can lead to newdiscoveries and verification of laws of physics, making microelectronics field popular and a key factor for new, innovativelaboratory technologies.

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Holograms teach you Physics 13 Aug4:00pmA1David Jacome

Saint Peter’s University

The way we communicate with each other is changing each day.We have gone from face to face interactions using the WorldWide Web on Desktop computers, to using smart phones forSkype or Facetime, and recently having watches send replies toeach other in a matter of seconds. If we traveled back in timeto the 1950s and spoke directly to people about the future,they would probably respond by saying, I would never expecta person to see another person live on a television screen. Evengrowing up watching Willy Wonka and the Chocolate Factory,nobody would have imagined during the scene when TV boy istransported to a small screen disappearing in front of everyone.Today, I will tell you a story of how outreach and physics edu-cation will be done in 2020. Just imagine sitting in a classroomby yourself, with no classmates or even a professor.

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Plasma Physics

Experimental examination of the effect ofResonant Magnetic Perturbation on the

edge-plasma turbulence in fusion devices 13 Aug4:00pmB2Lilla Vano


The tokamak is so far the most developed type of the magneticconfined fusion devices. In a tokamak, the fuel is in plasmastate. Special periodic plasma instabilities, the so-called EdgeLocalized Modes (ELMs) exist in high confinement operationalmode. During an ELM significant amount of energy and parti-cle is lost which cause large damage on the plasma facing com-ponents. But the ELMs also have advantages, such as throwingout impurities. Thus mitigating the ELMs and their negativeeffect is crucial for a future fusion reactor, like ITER.

There are some methods that are considered to fulfill thistask in a tokamak. One of these methods is the ResonantMagnetic Perturbation, during which the magnetic field at theedge of the plasma is perturbed. Previous experiments andstudies have shown that it can decrease the amplitude of theELMs or even suppress them in some configurations. However,the effect of the RMP on the turbulence of the plasma is neededto be examined more to understand it. This is crucial for itsoptimization for ELM mitigation. In my work I examine howit changes the density fluctuations at the edge of the plasma inboth low and high operational mode.

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There is a 2D turbulence imaging spectroscopy diagnos-tic for magnetic confined fusion devices, called Beam EmissionSpectroscopy, where the measured data is proportional to thelocal density. Thus its results are suitable for researching thedensity fluctuations and the turbulence. Data from this diag-nostic was examined mostly.

Plasma facing materials in thermo nuclear fusionreactors: retention of nuclear fuel13 Aug

4:15pmB2 Bogdan Butoi


Nuclear fusion has been found to be one of the most promis-ing methods of creating clean energy, in order to satisfy futureneeds both in terms of a clean environment as well in energygeneration and consumption. Scientists for the XX centurysaid nuclear fusion will be ready for public use very soon andalthough we came a far way and succeeded in creating fusiondevices, there are still big problems in maintaining the reac-tions needed to have a energy output. In this paper, some ofthe physics and engineering problems found in tokamak fusionreactors are presented, such as the use of materials that couldwithstand the harsh environment inside the reactor as well asmethods used to simulate processes that occur. Using differ-ent deposition methods, we investigate material depositions (asfound in the reactor) to determine solutions for cleaning the re-actor and desorbing the nuclear fuel trapped in the walls.

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Quantum Physics andTechnology

Introduction to quantum correlations 10 Aug9:30amA3Maria Gieysztor

Uniwersytet Wroc lawski

Considering composite quantum systems one can ask whetherthe system behaves in a quantum or classical way. This isrelated to the kind of correlations between their subsystems.In my presentation I will start with introducing the classifica-tion of composite quantum systems and in the following partsI will elaborate mainly on the quantum correlations. I willexplain the notion of quantum discord as a measurement in-duced informational measure of quantum correlations and dis-cuss its properites. Moreover the geometric approach to quan-tum discord will be presented along with its properties andconsequences

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The Components of an Integrated QuantumOptics Network10 Aug

9:45amA3 Marco Canteri

University of Trento

This talk will introduce the elements of an integrated quantumoptics network, with an emphasis on the basic blocks such aswaveguides and microresonators. In particular I will focus onmicroresonators where the electric field is enhanced and a lotof energy is stored inside. This feature can be exploited inorder to produce a wide range of interesting and useful non-linear optical effects which will be described as well as theirapplications in the field of quantum technologies.

On-Chip Quantum Optics in One-Dimension:Single Molecules coupled to a Dielectric

Nanoguide10 Aug10:00am

A3 Dominik Rattenbacher

Friedrich Alexander University Erlangen-Nuremberg

Over the past two decades conventional light-matter interfacesas optical high-finesse cavities, plasmonic field confinement orhigh NA-objectives have been used to study the interactionbetween photons and quantum emitters down to the singlequantum level. There is much interest to extend the currenttechniques in order to assemble networks out of several cou-pled quantum emitters, since they would give access to study awide range of interesting quantum many-body phenomena, e.g.the Luttinger liquid of photons, quantum phase transitions inphotons or a quantum-optical Josephson interferometer. How-ever, the controlled assembly of more complex quantum optical

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networks poses many experimental challenges. Here, subwave-length waveguides (nanoguides) with a highly confined guidedmode provide a one-dimensional optical bus for coupling manyquantum emitters to the same photonic mode. Through theirhigh quantum efficiency and their stable spectral propertiesorganic dye molecules are ideal components of an optical net-work. We will introduce the spectroscopy of single moleculesand discuss the coupling of molecules to a nanoguide. Recentexperimental results concerning the coupling strength and thetuning capabilities will be presented. Furthermore we will givean outlook for further experiments containing nanoguides withadditional resonators or Bragg mirrors.

Quantum Optics and Plenoptic Imaging 10 Aug10:15amA3Giovanni Scala

University of Bari

The main area is Quantum Optics, specifically some appli-cations in plenoptic imaging. For example, such could im-prove some technical specifics of field cameras, focusing on somemathematical tools, such as correlation functions, which are ap-plied in experimental requests. This is an example of how ourparadigma to do science is not before theory and then experi-ment, or viceversa, but it is a superposition of them. Managingentaglement and quantum measurement we can “kill two birdswith one stone”, but let me say “save a couple of lovers thatwere breaking up”. But, don’t tattoo it, please!

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Optical space-time duality in quantumapplications10 Aug

10:30amA3 Filip Sosnicki

University of Warsaw

Optical space-time duality arises from the mathematical equiv-alence between paraxial diffraction of beams confined in spaceand the temporal dispersion of optical pulses during propaga-tion in dielectric media. Going beyond the immediate parallelsof diffraction and dispersion, the duality indicates that manyspatial optical elements, for example a lens, have temporalcounterparts realized by applying appropriate phase shifts tothe waveform in the time domain. Temporal imaging has pre-dominantly been applied to the measurements of ultrafast op-tical waveforms by distorsionless magnifying or Fourier trans-forming the waveform and thus allowing to probe its temporalor spectral features with slow electronic measurement devices.Beyond waveform characterization, temporal imaging systemshave the potential to achieve lossless spectral bandwidth con-version of single-photon wavepackets. It is an important ele-ment, necessary to realize optical connections between quan-tum system with a wide variety of characteristic bandwidths.For example, between a wavelength-division-multiplexed chan-nel with a 50 GHz bandwidth, and atomic quantum memorieswith absorption lines of single MHz bandwidths. During thispresentation I will derive the optical space-time duality andpresent a realistic implementation of time lenses and results ofsimulations of the single-photon bandwidth converter.

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Squeezed light: Going beyond the quantum noise 10 Aug10:45amA3Lamborghini Sotelo

Universidad Autonoma de Baja California

What is a squeezed state of light? We know that a coherentstate of light is that which holds the lowest indetermination inthe measurement of its quadrature (position and momentum)according to Heisenberg’s uncertainty principle. This meansthat both of the variances if its quadrature have the same valueand their product gives us:

∆x∆p =1

2

1

2=

1

4. (1)

We then say that a state is squeezed if the variance of a quadra-ture is below the variance of a coherent state (or the vacuumstate) at the expenses of an increment in the variance of theconjugate quadrature. In order to characterize this kind ofstates we appeal to homodyne detection. Homodyne detectionconsists on using a strong and well known local oscillator whichis combined with the state under study by using a beam split-ter. Then by subtracting the intensities registered from twophotodetectors and using photon statistics we can reconstructthe density matrix of the state under study. It is of great in-terest to our group to generate and characterize non-classicalstates of light, particularly squeezed states. For this purposewe are working on the implementation of a homodyne detec-tion system that will allow us to have a full characterizationof the states implemented in our laboratory: squeezed statesgenerated through Spontaneous Four Wave Mixing (SFWM)in optical fibers and hybrid continuous entangled states.

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Applications of ac+dc driven Frenkel-Kontorovamodel13 Aug

3:00pmA3 Sonja Gombar and Nemanja Micic


The Frenkel-Kontorova (FK) model is a simple discrete model,in which competition between interactions determines groundstate energy. When FK model is subjected to external driver,it has a wide range of applications in physical systems suchas charge and spin density wave systems, irradiated Josephsonjunction arrays, vortex matter etc. In this work some gener-alization of this model will be used in order to match experi-mental results in mentioned type of systems.

Asymmetric Quantum Systems in StrongElectromagnetic Fields as Terahertz Radiation

Sources13 Aug3:15pm

A3 Piotr G ladysz

Nicolaus Copernicus University

In the last couple of years, technologies based on terahertzradiation have become increasingly interesting due to their nu-merous applications in fields such as medicine, biotechnology,material engineering and even history of art. For all of theseapplications, it is essential to use efficient and tunable sourcesof terahertz frequencies. This presentation is about quantumsystems with broken inversion symmetry subject to a strongelectric field, which can be used as sources of terahertz radia-tion. A two-level quantum system characterized with inversionsymmetry and coupled to a classical electromagnetic field un-dergoes so-called Rabi oscillations where the population flips

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between the ground and excited levels. I will discuss how thedynamics is modified if a system of broken inversion symmetryis exploited instead. Then, the eigenstates are characterizedwith an extra electric dipole moment originating from the po-larisation of charges, which plays a significant role. Apart fromRabi oscillations between the energy levels, additional effectiveoscillations of eigenenergies of these levels can be identified. Iwill demonstrate how this leads to radiation emission not onlyat the transition frequency of the system but also with themodified Rabi frequency. The latter could reach the terahertzdomain if the quantum system is driven by strong electromag-netic fields, e.g. at close vicinity of plasmonic nanostructures.Final goal is to propose a plasmonic device that could be ex-ploited to implement the above-descibed scenario.

Microscopic System For High Power Laser SportDiagnose Using The Third Harmonic 13 Aug

3:30pmA3Petrisor Gabriel Bleotu

University ’Politehnica’ of Bucharest

The technology for developing high power lasers (> 10 TW)and the future state of the art facilities such as Extreme LightInfrastructure-Nuclear Physics 10 PW (ELI), must be able torespond to all the problems which may occur in such types oflasers, such as the amplification or beam propagation. One ofthe studied problems is the monitoring and diagnosing of thebeam profile using the intensity pattern of the focal spot gener-ated at the interaction with a target. This procedure providesinformation which can be used to check the maintenance ofbeam quality and also its focusability. The generated inten-sity can belong to 1019 Wcm−2 - 1024Wcm−2 hence, makingit impossible to use a CCD camera or other devices. Here we

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present a method for characterizing the spatial profile of sucha laser focal spot by imaging the interaction of the beam witha solid target using the third harmonic (3ω). The third har-monic is very useful because it preserves the intensity patternof the fundamental wavelength while allowing the informationto be collected by a conventional camera. The experimentalsetup includes: a femtosecond laser, the solid target, filters forthe fundamental wavelength, two parabolic mirrors, an opti-cal setup designed to collect and magnify the laser beam anda CCD camera. Due to the large diameter of the laser beam(approx. 550 mm), two parabolic mirrors with different focallengths, positioned at a specific angle, are used to collect, redi-rect and narrow the beam, such as it can be collected by amagnifying optical system and then by a CCD camera henceobtaining the intensity pattern of the focal point which is prop-erly analyzed in order to get the right experimental setup forfuture experiments.

Measuring the Intensity Profile of a Laser Focusby the Fluorescence of Quantum Dots13 Aug

3:45pmA3 Tobias Messer

Karlsruhe Institute of Technology

3D printing is an emerging field both in the macro and thenano scale. Especially while working in the nano scale, thereare a lot of limiting factors for resolution. One thing to im-prove is the usage of two-photon absorption followed by thecombination of two-photon absorption with the STED mech-anism we know from high resolution microscopy. This meansthere is one first laser with a common gaussian focus which ex-cites the photoresist via two photon absorption followed by adelayed second laser with a different wavelength. The phase of

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the second laser is modified the way that for example a donutshaped focus arises. In this case, one of the limiting factorsconcerning resolution is the shape of the intensity profile of thesecond laser focus. Therefore, we are proofing the widely usedmethod of measuring the profile via reflection on gold beads (∼100 nm) as well as setting up a new one. In this new method,we are measuring the profile by measuring the fluorescence sig-nal of quantum dots (6 nm) with a confocal microscope. In mytalk, I will show you disadvantages of the old method togetherwith results of the measurements.

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Theoretical Physics

Special Theory of Relativity and the Isotropy ofthe Speed of Light 13 Aug

9:30amA1Micha l Dragowski


The assumption of constancy and isotropy of the speed oflight was laid by Einstein at the foundation of the special the-ory of relativity. This assumption corresponds to one particularclock synchronization procedure, while an equivalent descrip-tion of relativistic phenomena may be achieved using other con-ventions. A common misconception regards the possibility ofexperimental verification of this assumption. It can be easilyshown that it is impossible to measure the one-way velocityof light using the direct (time-of-flight) method, as it can onlybe measured over a closed path. The lack of understanding ofthe above described concepts leads to a wrong interpretation ofthe results of Michelson-Morley type experiments, which willalso be discussed. Finally, taking advantage of the freedom tochoose a clock synchronization convention, a synchronizationprocedure resulting in absolute simultaneity will be presented,following the work of J. Rembielinski. Such formalism is com-pletely compatible with the Einstein’s formulation (i.e., givesthe same description of physical phenomena), while providingthat events simultaneous in one reference frame remain simul-taneous in other reference frames. Such formulation not onlyallows for a convenient description of many relativistic phe-nomena, but is also fully consistent with the quantum theory

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owing to the fact that the spatial position does not participatein the time component transformation between two referenceframes.

Time, simultaneity and synchronization13 Aug9:45am

A1 Adrian Solymos


Time is a fundamental feature in almost all physical theoriesand models. We treat time as if it was a self-evident, intuitivestructure of our reality: We talk about time points and time in-tervals without properly differentiating between them. There isproper time (local) and synchronization (global), notions thatmay seem interchangeable. We also measure the speed of lightbetween two different points in space to be constant without re-alizing that instead of making a measurement we are acceptinga convention: the Einstein synchronization. The talk wishes toclear up these concepts and if possible may cover some para-doxes that arise from the ill-definedness of these. A mathemat-ical model of flat spacetime developed in the book ’SpacetimeWithout Reference Frames’ by Tamas Matolcsi will be used asthe framework of the talk. The non-relativistic and the specialrelativistic case will be presented.

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Geometric description of Hamiltonian-constrainedsystems 13 Aug

10:00amA1Aleksandra Sroda


In General Realativity Theory, evolution of systems in whichgauge transformations are given by the Hamiltonian requiresadditional structure apart from the one formulated within thestandard framework. The aim of the talk is to present geomet-ric description of Hamiltonian-constrained systems and showapplications of analysis of sample physical problems. Two ex-amples are analyzed: the dynamics of a free particle in theMinkowski spacetime (in both inertial and noninertial referenceframe) and the de Sitter spacetime (in two and three dimen-sions).

Ghost free actions in multimetric gravity 13 Aug10:15amA1Daniel Blixt

Stockholm University

There are spin-2 field theories with an action structure contain-ing more than one metric and these theories might challengegeneral relativity. These theories are called multimetric grav-ity or multigravity (bimetric gravity and bigravity when theaction contains exactly two metrics). I will give an overviewof actions which are, or might be ghost free. The multimet-ric gravity theories contains more than one propagating spin-2field. I will briefly talk about the cosmological implications wecan get from these theories.

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Causal Dynamical Triangulations Quantumgravity13 Aug10:30am

A1 Daniel Nemeth

Eotvos Lorand Science University

Causal Dynamical Triangulations (CDT) is a non-perturbativequantum field theory of gravity via a lattice regularization,based on Regge Calculus and Wilsonian renormalization group.The theory bypassing the usual renormalizational problems ofgravity with a very elegant way. It is also specific for the theory,that in 2 dimensions it forms an analitically solvable theory,while in higher dimensions only numerical simulations, such asMonte-Carlo, can lead to results. The basics of the theory isquite simple. In d-dimension (usually 2,3,4) d-dimensional sim-plices filling the Manifold (universe), so triangles, tetrahedronsand pentachorons creating a Triangulation. As a counter toother theories, time playes a different role, not as a parame-ter, but as a foliation of the d-1 dimensional spatial Triangula-tions. During the Monte-Carlo simulations these triangulatedManifolds as configurations can be examined. Analyzing theconfigurations information connected to the Einstein-HilbertAction can be extracted. The CDT theory has a very specificphasestructure of the bare coupling constants, that seems tobe independent from the topology of the Universe.

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The Hypothesis of Perpendicular Time 13 Aug10:45amA1Manik Dawar

Amity University

Based on two assumptions, the consequences on the relativemotion of a system’s constituents as a function of its uniformvelocity are discussed. The system is similar to a “box andideal gas” system. The first assumption is the existence of amaximum speed at which the constituents of the system cantravel relative to any observer at a given instant. The secondassumption is that v/l = v′/l′. v is the velocity, which a givenconstituent (initially at rest) of the system attains when it isacted upon by a given impulse. l is the speed limit, the exis-tence of which has been assumed. v′ is the velocity attainedby the same object (constituent), initially travelling at a con-stant, non-zero velocity relative to the observer, but at restrelative to the frame of the system, when it is acted upon bythe same amount of impulse. l′, for a given direction, is themaximum speed which any constituent of the system can at-tain relative to the system, but measured by an observer whois not stationary relative to the system. From the equation ofthe second assumption, two expressions v/v′ are obtained, thepossible implications of which are then discussed.

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The uncertainty principle for energy and time12 Aug9:30am

A1 Kasia Budzik


The Heisenberg uncertainty principle is a mathematical state-ment that gives the lower bound on the accuracy with whichtwo observables, like x and p, with non-commuting operatorscan be measured. One would hope for a similar relation forenergy and time. We have an energy operator, the Hamilto-nian, however, there is no time operator, since it’s existencewould have non-physical implications. Nonetheless, the uncer-tainty relations between energy and time appear frequently inphysics, for example in the relation between the lifetime andthe energy spread of a state. I would like to talk about dif-ferent ways to derive and interpret such uncertainty principles,for example by defining particle’s arrival time distribution.

Multipartite entanglement using matrix productstate approach12 Aug

9:45amA1 Mihaly Mate


Due to the Nobel prize in phyisics in 2016 the Haldane phasehas became focused in the field of topological phases and stronglycorrelated systems. The simplest model showing the propertiesof this special phase is the widely studied bilinear-biquadraticmodel in a given range of the phase space.

H = cos θ∑i

SiSi+1 + sin θ∑i

(SiSi+1)2

At a special point this model, known as Valence Bond Solid orAKLT model (after Affleck, Kennedy, Lieb and Tasaki), is inte-grable and its ground state gives the simplest structure among

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matrix product states (MPS). Analysing these kind of quantumsystems the most powerful method is the density matrix renor-malisation group (DMRG) algorithm which inherently repre-sents the structure of MPS. Pair correlation and entanglementof spins are fundamental notions to study in strongly corre-lated systems, however, multipartite correlations can offer amuch more essential and evident framework. In my work thebilinear-biquadratic and the J1−J2 Heisenberg model is inves-tigated with the methods of multipartite correlations and en-tanglement using analytical techniques and DMRG algorithms.The exponents for multipartite correlation are determined inthe different intervals of phase space (e.g. critical-, dimerised-,Haldane phase).

Symmetries and integrable systems 12 Aug10:00amA1Mikheil Sokhashvili

University of Tbilisi

This talk is about importance of symmetries. I will present2 different potentials and will investigate the motion with clas-sical mechanics and quantum theory as well. One of this poten-tials just reflect particles, in second case (deformed oscillator)we get oscillation. Symmetries help to construct conservedquantities also called, dynamical integrals (DI). In quantumtheory using symmetries we can solve Schrodinger equation.My goal is to introduce fermionic degrees of freedom and de-scribe a supersymmetric extension of this model and of itshigher dimentional analogs. I have not done this part yet, butI am working on it and it will be ready for the conference.

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An introduction to supersymmetry12 Aug10:15am

A1 Jan Peter Carstensen

Hamburg University/DESY

The purpose of this talk is to give a quick introduction to su-persymmetry. I will focus on mathematical and formal aspectsrather than phenomenological ones. Building on this I willmotivate why supersymmetry is an interesting topic to studyregardless of whether it is realised in nature.

Polyakov Loop extension to Yang-MillsThermodynamics12 Aug

10:30amA1 Valeriya Mykhaylova

University of Wroclaw

Effective Polyakov-loop models are known as macroscopic ap-proaches to pure SU(3) gauge theory. Such an extension ofYang-Mills theory gives thermodynamics which has a goodagreement with lattice gauge theories. The main goal is toderive the thermodynamic potentials in the SU(3) pure Yang-Mills theory in the presence of a uniform gluon field withinthe background field method. An effective gluon potential isformulated in terms of the Polyakov loop. During the presen-tation I will show that in extended Yang-Mills theory at lowtemperature an unphysical thermodynamics of gluons appearsand therefore a hybrid approach is needed. The results for morerealistic description of QCD thermodynamics with quarks willbe also discussed.

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Physical applications of Poisson and symplecticreductions 12 Aug

10:45amA1Julia Lange


This talk is aimed to be an introduction to Poisson and sym-plectic geometry. Special attention shall be paid on describingthe so-called Poisson reduction, which allows us to project aPoisson structure with certain symmetries onto a new Poissonstructure on a quotient manifold. As an application, we willaddress the use of Poisson and symplectic structures and theirreductions to systems of physical interest, e.g. a particle in amagnetic field.

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Poster Presentations

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Astrophysics,Cosmology and Space

Physics

Hα Categorization and Radial Velocities of LowMass Stars

Erik Johnson

University of Gottingen

Low-mass stars are the most numerous stars in the galaxyand are very promising candidates for exoplanet surveys. Thesestars, however, are subject to a radial velocity jitter that hasproven problematic for these surveys. It is thought that sincethese stars tend to have high levels of stellar activity that thestellar activity caused the radial velocity jitter. When we wereinvestigating this, using Hα as an activity indicator, there wasno evidence for a stellar-activity induced radial velocity jitter.However, we found that the spectra of the 176 CARMENESstars surveyed could be placed into four categories ? absorptive,neutral, intermediate and active. The exact ordering of theactivity levels between these categories are still in question.

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Probing inflation with gravitational waves

Philip Sørensen


We will investigate how precise models of inflation can be probedthrough the imprint of primordial gravitational waves in theCosmic Microwave Background (CMB). Gravitational wavesare generated by quantum fluctuations during inflation, withan amplitude proportional to the energy scale of inflation, andsubsequently imprinted in the polarisation of the CMB. Theaim of this presentation is to understand how precise measure-ment of the CMB polarisation can teach us about the energyscale of inflation, and to understand the precise physics in-volved in how gravitational waves gets imprinted in the polar-isation of the CMB. The presentation is based on a bachelorthesis written by Philip Sørensen and supervised by Martin S.Sloth of the Centre of Cosmology and Particle Physics, SDU.

An observational study on the origin of cosmicrays

Yigit Sonmez

Koc School

In this study, the origin of cosmic rays is studied by perform-ing Chandra and XMM-Newton analyses of supernova remnantCassiopeia A (Cas A). In order to point out the origins of cos-mic rays, I also explained steps of stellar evolution. With theorigins of high-energy cosmic rays still in doubt, I hypothe-sized that the sources of these high-energy cosmic rays are atthe shells of supernova remnants. X-ray images are createdusing Chandra and XMM-Newton observations of Cas A. Ds9

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tool of HEASARCH is used make extensive structural analysisand emission from inner and outer regions of the SNR. Shellsites are investigated in detail and spectra for selected regionsare extracted and commented upon. Cas A is analyzed at dif-ferent X-ray energies from 0.2 to 8 keV and comparison of im-ages is done accordingly. Comparisons clearly show that shellregion of Cas A is responsible for hard X-ray emission whichprovide mechanisms to accelerate cosmic ray particles throughthe universe. Also, these possible mechanisms are discussedand related with the results.

Study of efficiency of the ORTECDetective-EX-100T

Maria-Larisa Ganea


Gamma-Ray Spectrometry is a fundamental measuring tech-nique commonly used to obtain experimental information onunambiguous nuclear structure. Its advantage lies on the factthat is a non-destructive technique. In order to identify theunknown radioactive nuclides, the process requires instrumentswith excellent resolution and also reasonable efficiency. Gamma-Ray Spectrometry with HPGe detectors are used for the deter-mination of the radioactive concentration of the radionuclidesthat can be found in the environment. We investigated theefficiency of the ORTEC Detective-EX-100T using standardgamma-point sources set composed by 133Ba, 152Eu and 137Cs.The main advantage of the detector it’s the performance inthe rapid identification of radioisotopes. Futher, the efficiencycalibrations were performed for three different geometries: 10,15 and 20 cm distances from the end cap of detector. Thestudy revealed that significant deviations in the efficiency are

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depending on the source-detector distance and photon energy.

X-ray Investigation of SNR Tycho Using ChandraAnalysis

Mustafa Bozkurt

Bogazici University

Supernova remnants are high energy sites in the universe. Inthis study, a shelllike SNR Tycho are analyzed using its Chan-dra observations. X-ray study of Tycho is performed usingCiao 4.7 and XSpec softwares. Inner and other regions of Ty-cho are studied at three different energy bands which are 0.2 -1.5 keV (soft), 1.5 - 2.5 keV (medium) and 2.5 - 8 keV (hard)respectively. Shell sites of the SNR show hard X-ray dominatedobservational properties. Inner regions of Tycho reveal a highsoft X-ray profile in which spectral analyses show sharp Si andFe lines. Also, comparison of the selected region is done atdifferent energies and possible sources for high-energy particleswith effect of inverse Compton and Synchrotron emissions arestudied.

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Excitation of a Type-II radio bust during theearly expansion phase of a solar eruption

Federica Frassati

University of Torino

The formation of coronal shock waves is usually observation-ally identified by the presence of a Type-II radio burst; never-theless, the association between shocks and different possibledrivers (flares and/or expanding eruption fronts) is not fullyunderstood. In this work we investigate the early expansionphases of a limb Coronal Mass Ejection (CME) in order torelate the inferred kinematical properties with the observedType-II radio bust. Background plasma densities were derivedin the lower corona with SDO/AIA EUV images analyzed withDifferential Emission Measure technique, and in the interme-diate corona with SOHO/LASCO VL images analyzed withinversion of polarized brightness. The same data were used toinfer the kinematical properties of the expanding CME front, inorder to compare the expansion speed with local Alfven speed.Results show that the shock is likely excited at the same timeat different inclination angles along the front, independently onthe front projected altitude, also in agreement with the Type-II bust timing. Possible implications for this result on SEPacceleration are also discussed.

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Spectrum of cosmological Stromgren spheres

Agnes Kis-Toth

Eotvos University

The epoch of cosmological reionization and the nature of theionizing sources bear fundamental cosmological importance,but are yet unknown. Our knowledge of the classical H IIregions around hot stars suggests how this process might havehappened. Ionizing sources, whether galaxies or quasars orsources of other nature, embedded in the neutral intergalac-tic medium (IGM) before cosmological reionization generatedseparate H II regions, and these regions eventually could haveoverlapped to ionize the whole universe. We derive the cosmo-logical generalization of the classical Stromgren sphere to tothe case of a quasar as an ionizing source in a comologicallyexpanding gas in a Friedmann-Robertson-Walker universe. Weestimate the recombination-line spectrum of these cosmologicalStromgren spheres emitted by hydrogen atoms that have beenformed by captures of electrons into excited levels and thatare cascading by downward radiative transitions to the groundlevel. We show that in the future we might will be able tomeasure these recombination lines, especially the Lyman alphaand beta lines, using the James Webb Space Telescope whichwill be launched in 2018.

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Automatic processing of gamma ray spectra

Alexandru-Ferencz Filip

University Politehnica of Bucharest

In recent years, the acquisition of gamma rays spectra has be-come a highly appreciated domain for its broad applications.Gamma ray spectrometry with Ge detectors is an excelent anal-ysis tool, used in many fields of physics, but not always is iteasy to obtain an accurate result. The spectrogram of an el-ement is composed of unique areas consisting of gamma raysphotopeaks, Compton scattering and the Compton Edge. Mostgamma rays spectra photopeaks are overlayed on top of eachother, making the reading of the spectra challenging and con-fusing. A manual calibration for the desired result can be doneby the user, but when working with numerous spectra this ac-tivity can be taken by an automatic processing application,thus calibrating the overlayed photopeaks and separating themfor a distinct reading. In this paper, the chosen programmingenvironment is IGOR PRO, a program that allows for a moredetailed and precise analysis through a code that can inter-pret ovarlaying photopeaks. This outcome is most helpful forinstances where the spectra that is registered is contaminatedwith another gamma ray spectrum from an additional element.

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The Magellanic Group

Cristina Mier Gonzalez

Universidad de Oviedo

The Magellanic group is formed by the famous MagellanicClouds, two dwarf galaxies which are surrounded by three maingaseous structures: The Magellanic bridge, the Magellanic streamand the leading arm. Its singular location, close to the MilkyWay, makes it a unique scenario for dwarf galaxy and satellite-host galaxy interactions studying. In this work I review ourcurrent knowledge of the Magellanic System and its compo-nents. The technological development of the last decades havemade possible the access to further information about the cloudsand the gaseous structures surrounding them. This have al-lowed the development of new theories about their interactions,formation and history. I also summarize the main scenarioswhich explain the proper motion of the clouds, the dispositionof the gaseous structures and the fate of the Magellanic group.In particular, I treat the main scenarios which explain the ori-gin of the Magellanic stream.

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The non-linear relation between X-ray and UVluminosity of Quasars: a new “standard candle”

Viola Gelli

Universita degli Studi di Firenze

Quasars are among the brightest sources observed in the uni-verse and they have a wide emission spectrum. There is anon-linear relation between monochromatic luminosity in X-rays (fixed at 2KeV) and UV (fixed at 2500 A) of Quasars. Inthis work I studied this relation, checking it and looking for itspossible applications in cosmology.

Observational cosmology is based on the study of stan-dard candles, i.e. sources characterized by a known luminosity.Through them it is possible to find the luminosity distanceDL (function of the redshift z ) and to study its trend (in theso called Hubble Diagram) obtaining important informationsabout the cosmological models. Such studies are generally per-formed by using Cepheids and Supernovae as standard candles.We wondered whether it is possible to use Quasars as standardcandles, taking advantage of the non-linear relation in the formlogLX = γ logLUV + β. They would in fact allow us to studythe Hubble Diagram at very high redshifts (up to z ∼ 6).

I performed an analysis with a sample of 2060 sources, test-ing this relation and concluding that Quasars represent a pow-erful tool to estimate the cosmological parameters and to checkthe models at long distances.

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Reheating after primordial inflation

Daniel Lozano

University of Barcelona

In this work, we analyze the hypothesis that the inflation fieldhas an incomplete decay during the inflation and nowadaysis the responsible of existence of the dark matter observed.We analyze the decay of a scalar field into photons pairs inthe known case of a quadratic potential, and we extend thisto the case of a quartic potential. We study the existence ofresonances in such models and we analyze their dependence onparameters. We obtain that the resonant momentum k in thequartic models is proportional to

√λφi where λ is the quartic

coupling and φi is the initial value of the inflation field. Thecoupling parameter f instead only affects to the strength of theresonance.

XMM-Newton Study of Abell2597

Isil Selcuk

Bogazici University

In this study, I present an analysis of XMM-Newton observa-tion of Abell2597 (RA :23h 25m 19.6s — Dec -12◦ 07’ 27.4”).It located in the local universe (z=0, 0852). Structural proper-ties of Abell2597 using archived data and XMM-Newton anal-ysis tools: SAS. Image analysis of the cluster is performed byDS9 tool of Heasoft and different energy band images are con-structed. The mosaic image of Abell2597 is performed by com-bining soft, medium and hard images. XSPEC tool of Heasoftis used spectral analysis of the cluster which reveals strong

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emission lines at the hot gas between the galaxies. Using spec-tra of Abell2597, emission lines at given redshift are investi-gated. I try to explain the effects of these abundances withincentral region on its environment in following states.

Brightness Variation of Seven Young Sun-likeStars from Ground-based and Space Telescopes

Gabriella Zsidi


Young stellar object are stars in the early stage of their evo-lution. They often show photometric variability, which may bedue to non-steady accretion from the circumstellar disk ontothe star, but other physical processes, such as rotating coldspots or the transit of a dust cloud can also change the observedbrightness of the star. Variability is well examined at opticalwavelengths, but nowadays more and more infrared data areavailable as well. The wavelength dependence of the variabil-ity carries information on the physical cause of the changingbrightness. Here, we examine seven T Tauri-type stars knownfor their large amplitude variability selected from the Cam-paign 13 field of the Kepler K2 mission. We use nightly moni-toring observations made with the 90 cm Schmidt telescope ofKonkoly Observatory. We construct B, V, R, and I-band lightcurves and investigated the brightness and color variations ofour targets, in order to establish the origin of the variabil-ity. In order to extend our wavelength coverage, cadence, andtemporal coverage, we will complement these data with high-cadence, single broad-band optical filter light curves from K2,and 3.6 and 4.5 micrometer infrared photometry obtained witha nightly cadence with the Spitzer Space Telescope.

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154

Biophysics and MedicalPhysics

Photoacoustic Imaging (Photoacoustic ImageFormation)

Cengiz Humeyra, Demirtas Dogu

Bogazici University

Photoacoustic imaging (optoacoustic imaging) is a biomedi-cal imaging modality based on the photoacoustic effect. In pho-toacoustic imaging, non-ionizing laser pulses are delivered intobiological tissues (when radio frequency pulses are used, thetechnology is referred to as thermoacoustic imaging). Some ofthe delivered energy will be absorbed and converted into heat,leading to transient thermoelastic expansion and thus wide-band (i.e. MHz) ultrasonic emission. The goal of PA imagingis to retrieve the local pressure rise p0 inside the tissue. If weknow the local optical fluence F, the absorption coefficient µacan then be calculated. In practice, the adjacent fluence F inthe tissue is usually comparable, but the absorption coefficientµa differs considerably. For example, blood in the visible lightregion has much stronger absorption than other components intissue. Thus, if F is assumed to be regionally homogeneous inanatomic PA imaging, then p0 can be used to directly map therelative absorption coefficient µa. For PACT, the light is ex-panded to illuminate the whole object to be imaged. PA signalsare acquired at multiple locations around the object, either by

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using a transducer array or by scanning a single-element trans-ducer to simulate an array. Next, back-projecting all the PAdata, similar to traditional computed tomography or positronemission tomography imaging, generates PA images of the ob-ject. Note that in order to detect PA signals from the sameobject at multiple locations, a transducer or transducer arraywith a large acceptance angle is desirable. Several methods arewidely used for PA image formation, such as universal back-projection (UBP) and time reversal.

Implantation of depth electrods instereoencephalography

Felicia Mihai


Stereoencephalography (SEEG) methodology is progressivelygaining popularity for the presurgical invasive evaluations ofdrug-resistant epilepsies. The SEEG implantation proceduresstill represent a challenge due to the intrinsic complexity of themethod and the number of depth electrodes required. Presur-gical evaluation of patients with drug-resistant epilepsy usingstereotactic implantation of depth electrodes is currently theonly method for delineating the epileptogenic network and lo-calizing the seizure onset in both zones and its projection ofthe cortical surface. This method allows to virtually access anycortical and subcortical area, but in order to achieve accuratethe 3D spatial sampling, a significant number of electrodes (be-tween 8 and 15, each having 5 to 18 contacts) have to be placedin functionally relevant structures. Those contacts enable usto find the areas where seizures start by connecting them toa device that function as an electroencephalograph. Using thesignal registrations taken on a maximum two weeks period, we

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can find the epilepsy centers and the neurosurgeon can erad-icate or sear the area. This methodology allowed successfulimplantation in all cases, with reduced errors, such as medianentry point localization error was 0.78 mm (range of 0.49-1.08mm) and the target point localization errors were 1.77 mm(range of 1.25-2.51 mm). SEEG is a safe and accurate proce-dure for the invasive assessment of the epileptogenic zone. Byknowing the coordinates of every location points (Arc, Ring,X, Y, Z), the implantation of depth electrodes enable us torecord the electrical activity from superficial and deep-seatedbrain structures, providing essential information in the mostcomplex cases of drug-resistant epilepsy.

Numerical model of lysozyme protein nucleationand growth kinetics

Andrey Sokolovskiy

St. Petersburg Academic University

The solution of many biomedical problems requires detailedinformation about chemical structures of biological molecules.The main way to obtain structural information about macro-molecules is growing crystals and their subsequent study byX-ray analysis.

To date, there is no model that satisfactorily describes theprocess of nucleation and crystal growth in the capillary. Thisresearch is applied for creating numerical model describing crys-tallization kinetics in the counter diffusion experiments. Themajor feature of the problem is the inability to use Fokker-Planck equation for the distribution function, like in most crys-tallization problems. This is due to the fact that we have seenin the experiment very small number of crystals and it’s pos-sible to describe crystallization kinetics for each protein crys-tal individually. In this research the artificial neural network

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with backpropagation algorithm has been used for predictingprotein solubility as a function of temperature, pH as well asprecipitant and buffer solution concentration.

The numerical model with good accuracy describes the pro-cesses of nucleation and growth of protein crystals for a longtime, as evidenced by a series of experiments. This numericalmodel may be used to predict the optimal conditions for crys-tallization of various proteins in the counter diffusion method.

Magnetic field reduction and its consequences.Therapy with magnets

Maria-Alexandra Nacu


There has been found a strong correlation between the mag-netic field variations and the changes in metabolic rate. It hasbeen noticed a considerable reduction of the geomagnetic com-ponent, which is a risk factor for health, generating functionaldisturbances of body systems. The aim of this paper is: re-searching functional effect induced by the interaction of livingsystems with magnetic field and revealing the methods of com-pleting the required magnetic field like magnetotherapy withNeodin (Nd).

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Identifying Functional Cluster of Genes fromEnergy Landscapes in Autoencoders for

Personalized Therapy in Medicine

Jenny Yang

University of British Columbia

In the pursuit of personalized medicine within oncology,growing attention is being given to machine learning for can-cer diagnostics and treatment. Because machine learning is atthe interface of theoretical physics and high-dimensional statis-tics, the accuracy and success of a model may not depend oncomputational power or algorithm complexity. Instead, it candepend on comprehensively understanding the theoretical dy-namics and energies of the data system itself. Our goal is to an-alyze the energy landscape of our autoencoder model, for pur-poses of determining which genes carry the most predictive in-formation in classifying different cancer types. We are trainingan autoencoder to perform dimensionality reduction on a set of17,688 genes in the human genome. The learning process findsweights over the training dataset that minimize a loss function.The loss function, derived from statistical physics, representsthe energy of the model. The training process aims to find aglobal energy minimum of the system. Looking at which hiddennodes have the strongest output signal, and performing pertur-bation analysis of these nodes against the input genes will helpus interpret predictive and discriminatory genes. While train-ing, we adjust the activation functions (e.g. sigmoid, standardnormal) and loss functions (e.g. cross-entropy, mean-squared)to better understand the energy landscape of our model, aswell as the characteristics of the training dataset. Understand-ing the theoretical underpinnings of our autoencoder model iscentral to determining which genes carry the most predictiveinformation for classifying different cancer types. This is a fun-

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damental task in our current research towards implementingpersonalized therapies in cancer.

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Computational Physics

Determining the structural properties of modelfluids by numerical solution of the equations ofmotion for the Fourier coefficients of density

fluctuations.

Bohdan Opryshko

University of Kyiv

The method of collective variables in the harmonic approxima-tion was investigated structural properties of two-dimensionalGaussian model fluid. Internal energy, system of many parti-cles and radial distribution function of model fluids in micro-canonical ensemble were evaluated with molecular dynamicsmethod. In order to ensure that the system established thermalequilibrium, the energy value observed at each time step. Fortwo-dimensional models of fluid particles with Gaussian inter-action Influence of harmonic approximation to the descriptionof structural properties.

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Effects of maximum node degree on computervirus spreading in scale-free networks

Omar Bamaarouf

Universite Mohammed V, Rabat

The increase of the use of the internet networks favors thespread of viruses. In this paper, we studied the spread of virusesin the scale-free network with different topologies based on theSusceptible Infected and External model (SIE). It is found thatthe network structure influences the virus spreading. We haveshown also that the nodes of high degree are more susceptibleto infection than others. Furthermore, we have determineda critical maximum value of node degree (Kc), below whichthe network is more resistible and the virus computer cannotexpand in the whole network. The influence of network size isalso studied. We found that the network with low size is moreeffective to reduce the proportion of infected nodes

C# as alternative language for computationalphysics projects development.

Bartosz Fidera

University of Wroclaw

C# is general purpose high level multi-paradigm object-oriented programming language created by Microsoft in 2000and currently is the 4th most popular coding language world-wide. In many programming fields it is said that C# canmatch or outperform languages commonly used in computa-tional physics like C++ or Java but even being as popularas it is, C# is rarely seen in science projects. The best wayto check statement about outperforming other languages is to

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benchmark them by trying the same simulation problem in foreach language and then comparing results in terms of execu-tion time, amount of code needed and used resources involvingtime required to master language enough to write efficient codeallowing for basic scientific usage. Then results can be shownin reader-friendly form that will allow for quick check if C#is really good alternative for scientific purpose as it has beensaid.

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164

Environmental andAtmospheric Physics

Studying saharan dust intrusions using ceilometerand satellite data over Romania

Daniela Zaharia


Atmospheric aerosols from both anthropogenic and natural sourcesintroduce large temporal and regional variabilities in the heatbalance of the Earth by scattering and absorbing solar radi-ation, absorbing and emitting terrestrial infrared radiation,and their ability to nucleate cloud droplets. Due to signifi-cant impacts on climate and the environment, desert dust isstill under scientific debate. This paper presents the resultsof three study cases of Saharan dust intrusions over southernpart of the Romania. For these studies the data base fromthe Ceilometers located at Magurele and Strejnicu was used.We study cases of aerosol long-range transport were selectedfor this work. Data for analysis was obtained based on themeasurements performed at the INOE measurement site, lo-cated in Magurele (44.35 N, 26.03E) in proximity of Bucharestand at INCAS Strejnicu research base (44.91 N, 25.95 E). Inorder to perform this study case we used complementary fore-cast and simulation models and ground based ceilometer mea-surements for both selected sites. The absence of rainfall inRomania was checked throughout the period, both with Hys-plit model, and the observations derived from wet deposition

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maps from DREAM. This type of study allows to scientists toconclude about the aerosol-cloud interaction and consequentlyabout regional atmospheric radiative budget, important for un-derstanding of climate change.

The downburst phenomenon

Eetu Rimo


In 1972 Japanese-American storm researcher Tetsuya TheodoreFujita was was asked to be a part of investigation team to helpthem find out why Eastern Air Lines Flight 66 crashed on ap-proach to New York’s John F. Kennedy International Airport.During his investigation, Fujita discovered that Flight 66 hadbeen a victim of extremely powerful yet unknown weather phe-nomenon that consisted of downward winds blowing at enor-mous speeds. Fujita named this phenomenon as the downburst.

Downbursts can appear all across the globe under the rightcircumstances. In my presentation I will tell about the down-burst formation more as well as the damage they can cause.I will also go more into detail about defining different typesof downbursts like what is the difference between a dry and awet downburst. Other terms associated with downbursts thatI’ll tell about include the small-sized microbursts, similar butlarger wind systems called macrobursts, derechos, that are se-ries of downbursts occurring on a long, straight path and theextremely rare and mysterious heat bursts that can rise tem-perature very rapidly in an instant.

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Fluid Dynamics

Pressure variation caused by the propagation of aboat in shallow water.

Abhishek Gupta

Institute Superior Tecnico, Lisboa

The propagation of a boat creates a disturbance in the sur-rounding region which causes the pressure variation. The pres-sure distribution caused by the moving boat is summarized inthe case of subcritical speed. A pressure measurement systemis established and the simulation has been performed. Thechange in the dynamic pressure coefficient along the length ofthe ship is obtained.

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168

Materials and SolidState Physics

Triple conducting oxides - synthesis, propertiesand applications

Iga Lewandowska

Gdansk University of Technology

Triple conducting oxides (TCOs) are materials that are ableto simultaneously conduct electrons (or holes) and at least twoionic spicies. This unique feature may be obtained only in avery specific crystallographic structures. The mechanism ofconductivity and the synthesis route of TCOs that conductH+,O2−,h+ (or e−) was shown. Electrical and structural prop-erties of this materials were characterized. TCOs have com-pelling applications in fuel cells, permeation membranes, sen-sors, electrolysis and electrofuels. In this work focus was puton application as the cathode in fuel cells.

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Laser-induced Breakdown Spectroscopy onContaminated Soil Samples

Petrisor Gabriel Bleotu

University ’Politehnica’ of Bucharest

Laser spectroscopy techniques are modern and competitive meth-ods for environmental analysis. Laser induced break downspectroscopy (LIBS), due to its advantages as noninvasive method,real time monitoring, selectivity, is a promising and suitabletool to measure metals in contaminated soils. In this respect,based on the well-known spectra of the heavy metals, a studyof the pollutants identification in soil was performed by LIBS.The results indicate the danger to use plants grown in contam-inated soils as food, for people but also for animals, but alsoopen the possibility to use specific cultures in contaminatedsoils as a method for decontamination and soil bioremediation.

Attosecond Pulse Generation Driven by IntenseChaotic Light

Anton Komarov, Anastasiia Vukolova

National Technical University Kharkiv Polytechnic Institute

We investigate the effect of noise perturbations on the elec-tron dynamics in the framework of semi-classical three-stepmodel by solving the time-dependent stochastic Schrodingerequation. We demonstrate that the harmonic noise can changethe transition probabilities substantially and that its impactdepends strongly on the characteristic frequency of the noise.We will demonstrate the conditions under which a resonance-like behavior emerges in the stochastic photoionization process.This noise induced phenomenon is studied for a variety of laser

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pulses, from a few optical cycles duration to very long ones,and of varying intensities. Furthermore we confirm that fora weak laser pulse which causes almost no ionization, an ad-dition of a Gaussian white noise to the pulse leads to a sig-nificantly enhanced ionization probability. Nevertheless, thegeneral efficiency of the coherent attosecond pulses generationis decreased. Let us consider the behavior of the moving elec-trons. The presence of the stochastic forcing term in the Hamil-tonian makes the quantum evolution nondeterministic. Thusan averaging over a large number of realizations of the stochas-tic force is required. Suppose that electrons move in phase withthe pondermotive wave, and, in the initial instant of time, theelectrons of choice realizations are uniformly distributed overphases.

Laser-Interferometric Position Measurement forScanning X-ray Microscopy

Valerija Music

DESY Hamburg

Modern X-ray nanoprobe beamlines probe local properties ofsamples with beamsizes below 100nm on a daily basis. Ad-vanced techniques such as ptychography allow to resolve single-digit nanometer features in realspace. Such local informationmust be attributed to the correct position on the sample. Posi-tioning on the nanometer scale can be corrupted by all sorts ofinfluences; thermal drifts and external vibrations are the mostcommon. We developed a sample position monitoring sys-tem using commercial laser interferometers and custom-builtball lens retroreflectors. The acquired positions can be usedin a feedback loop or for corrections in post-experiment dataprocessing. The fast sampling rate (up to MHz) allows us to

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monitor sample motion on all relevant time scales and identifysources of vibrations in our setup.

Magnetic properties and phase transition intransitions metal doped semiconductor

Younes Sbai

Mohammed V-Agdal University, Rabat, Morocco

On the basis of ab-initio calculations and Monte Carlo simula-tions the magnetic and electronic properties of Gallium nitride(GaN) doped with the transition metal Manganese (Mn) werestudied. The ab initio calculations were done using the AKAI-KKR-CPA method within the Local Density Approximation(LDA) approximation. We doped our Diluted Magnetic Semi-conductor (DMS), with different concentrations of magneticimpurities Mn and plotted the density of state (DOS) for eachone. Showing a half-metallic behavior and ferromagnetic stateespecially for Ga0.95Mn0.05N making this DMS a strong candi-date for spintronic applications. Moreover, the magnetizationand susceptibility of our system as a function of the tempera-ture has been calculated and give for various system size L tostudy the size effect. In addition, the transition temperaturewas deduced from the peak of the susceptibility. The ab ini-tio results are in good agreement with literature especially for(x = 0.05) of Mn which gives the most interesting results.

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CdTe nanowires: preparation and properties

Melania Loredana Onea


Nanostructures are of great interest due to many reasons. Byreducing the dimensions from bulk to nanostructures one canconsequently shrink the dimensions of a device and obtain abetter control of its proprieties and a reduction of the used re-sources. Among the nanostructures nanowires (quasi 1 dimen-sional structures) have remarkable characteristics derived fromtheir high surface to volume ratio which makes them more sen-sitive to surrounding stimuli. CdTe is a semiconductor whichhas applications ranging from solar cells to transistors. Elec-trodeposition is a suitable technique to obtain CdTe nanowires,one of the advantages of this method being the low cost, thecontrol the compositional characteristics and also the proper-ties of the material being similar to those in more expensivemethods. Polycarbonate ion track membranes were used astemplates to prepare CdTe nanowires. Morphological (SEM),optical (reflection) and structural (XRD) measurements wereperformed in order to assess the quality of the nanostructures.Further, in order to investigate the detector/transistor featuresof CdTe nanowires these were contacted using a combination ofmethods i.e. of electron beam lithography and photolithogra-phy. Thus, electrical properties were measured for individual,tailored CdTe nanowires.

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Physical properties of proton irradiated MgB2

Alina Marinela Ionescu


Magnetic properties, high field critical current density and pin-ning characteristics of a series of SPS-sintered MgB2 submit-ted to energetic proton (8.6-16 MeV) irradiation are presented.The critical temperatures show only negligible decrease withincreasing energy and fluence, whereas the Meissner fractionsignificantly decreases with increasing fluence and energy. Twocharacteristics are conspicuous after irradiation: a serious ex-tension of the temperature range where flux jumps are presentand an increase of the pinning energy of the irradiated samplesat high fields.

Development of a laser lithography system

Alvaro Nodar Villa


The photolithography – laser lithography – systems are be-coming a popular element concerning the manufacture of mi-cro and nanometric structures. This work will show the basisof this technique featuring the new Santiago de CompostelaUniversity photolithography system developed by the author.Additionally, this work will present the process of manufactur-ing bidimensional micrometric structures made with this samelithography system. This micrometric structures will be ap-plied to the confinement of light – integrated optics devices –and to the confinement of nanoparticles. Concluding this work,it will be shown measurements of the properties of this devices.

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Physical properties of NbSeI compound

Marta Roman


Although the crystallographic structure of NbSeI compound isknown from 30 years, its physical properties are still not de-scribed. NbSeI is an isostructural compound to the group of“defected” spinels AB4X8 (where A=Ga, Ge or Al; B=Mo, V,Ta, Cr or Nb; X=S, Se or Te). Characteristic feature of crystalstructure of these materials are tetrahedral, metallic clusters B4

determining their physical properties. Increase of correlationsbetween electrons are caused by mentioned unusual building ofcrystal structure and it leads to the occurrence of numerous in-teresting physical phenomena, such as structural and magneticphase transitions, superconductivity under pressure, colossalmagnetoresistance, multiferroism or electric-field-induced resis-tive switching (potential use in new class of memories – Resis-tivity RAM ). The occurrence of similar physical phenomenawas expected in NbSeI compound. Unusual crystal structureand similarity to the materials with interesting magnetic andtransport properties were a direct cause of a detailed examina-tion of the structure and physical properties of NbSeI. Repro-ducible synthesis method of NbSeI compound, the results ofpowder X-ray diffraction and the results of physical propertiesmeasurements (magnetic susceptibility, specific heat capacity)in the temperature range of 1.9 - 300 K will be presented here.

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Floquet-Bloch description of non-adiabaticradiation damage processes

Nicolo Forcellini

University of Cambridge

Damage caused by radiation is a major issue for structuralmaterials in fission and fusion reactors and in many other ap-plications. Understanding how radiation damage caused byhigh-energy particles occurs is a field of great interest in ma-terials physics, and most of this understanding has to comefrom reliable theoretical models: the timescale in which radia-tion damage processes take place is too short to be investigatedby experiments. Also, an explicit quantum mechanical treat-ment of the electrons is especially important for fast projectiles(E/W & 10 MeV). Starting from some simple and idealisedmodels, e.g. one-dimensional lattices perturbed by a fast pro-jectile, and by exploiting the symmetries of such systems, it ispossible to build a Floquet-Bloch description of non-adiabaticradiation damage processes. Such a general theory can be usedfor both a qualitative understanding of such processes and,hopefully, as an implementation to improve efficiency and reli-ability of existing simulation models such as TD-DFT.

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Functionalized gold nanorods at air-waterinterface

Agnieszka Wiciak

Poznan University of Technology

Gold nanoparticles deserve attention due to their unusual phys-ical properties. Characteristic for colloidal solution of goldnanoparticles is strong color, which is caused by the surfaceplasmon resonance. Gold nanorods (Au-NRs) were synthe-sized with seed mediated growth method described elsewhere.Cetyltrimethylammonium bromide-coated Au-NRs dispersionsare stable in aqueous solutions. The problem is to transferthem into organic solvents, because the layer structure of thesurfactant on the gold nanorod surface impedes the access ofphase transfer reagents to the surface. In this work we haveshown how to change nanoparticle properties to hydrophobicby silica coating. This method facilitates the manipulationof the Au-NRs, reduces aggregation and in addition preservestheir optical properties. In the next step we have produced andcharacterized thin films from functionalized Au-NRs dispersedin chloroform at air-water interface. For this aim, we used theLangmuir technique. This method allows organize and manip-ulate the materials organization at a molecular level.

Acknowledgments:This work was supported by the Ministry of Science & Higher Educationin Poland in 2017 year under Project No 06/62/DSPB/2171.

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Comparative study of the effects of rare earthions doped BiSrFeO3 nanomultiferroic

Maha Ayman

Ain Shams University

Nanomultiferroic materials have increased significantly over theyears in view of their projected potential applications in sensorsand recording media. Multiferroic materials are singlecompo-nent materials or composites exhibiting two or more ferroicfeatures such as ferromagnetism, ferroelectricity, or ferroelas-ticity effects. Recent resurgence of research interest for mul-tiferroic materials revived the possibility of strong couplingbetween the magnetic and ferroelectric order parameters ofsome promising materials and are likely to be used aroundroom temperature (RT) for possible device design and applica-tions. BiFeO3 (BFO) is the most interesting magnetoelectricmultiferroic compound and has attracted considerable atten-tion because of its ferroelectric and anti-ferromagnetic order-ing coexists in a single phase at room temperature. We arguedthat the addition of rare earth is likely to suppress the spiralspin modulation and at the same time increased the cantingangle which favors the enhanced ferromagnetism, that BSFOshowed antiferromagnetic behavior, but for the BSREFO ex-hibit a weak ferromagnetic behavior with remnant magneti-zation of highest value for Y3+ (Mr =0.43 emu/g).Electricalproperties were measuredand the temperature dependence onthedielectricconstant and temperature dependence onthe elec-trical conductivity (σac), at different frequencies ranging from100Hz to 100 kHz for undoped and doped nanomultiferroicswere recorded.A noticeable improvement in conductivity aftertheNd rare earth doping due to its higher transition tempera-ture for (Tσ =760 K) than the undoped BSFO sample.

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Ferromagnetic nanoparticle of Ising spin-1 with aRubik’s cube structure: Monte Carlo simulations

Kadiri Abdelmajid

Rabat University

Using Monte Carlo simulations, magnetic properties of the fer-romagnetic nanoparticle of Ising spin-1 are investigated in theframework of the Ising model. The system is assumed to havea Rubik’s cube structure where cubic structures blocks are fer-romagnetic systems having an equivalent exchange coupling,while, between blocks, the exchange coupling is considered tovary. On the one hand, size effects of cubic blocks, conse-quently, of the nanoparticle on phase diagrams of the systemare studied. On the other hand, the dependence of magneticbehaviors on system parameters is investigated. Thus, we fol-low variations of quantities such as the magnetization, the mag-netic susceptibility, the hysteresis loops and the critical tem-perature in order to explore phase diagrams of interest.

Ultrathin colloidal CDSE nanoplatelets for blacklight emitting devices

Tatiana Kormilina

ITMO University, St. Petersburg

While radiation sources based on colloidal semiconductor nanocrys-tals are currently a high demand, they do not cover the wholerange of possible applications due to insufficient spectral di-versity. Among these nanocrystals flat two-dimensional ones,called nanoplatelets have recently revealed a great potential asoptical gain media. Optical characteristics of nanoplatelets fa-vorably distinguish them from other nanocrystals by a narrow

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luminescence maximum and almost absent Stokes shift, whichmakes them promising for creating effective narrow-band lightemitters. Indeed, for platelets it is easy to obtain the radia-tion of the desired wavelength, this is achievable by low-costmethods, and the resulting colloidal solution is very conve-nient for insertion into matrices and the creation on their ba-sis of various multicomponent systems. The major drawbackthat prohibits for now the use of thinner nanoplatelets in theoptoelectronic applications is the fact of their optical proper-ties still being poorly understood, and, mainly, of the infor-mation about the kinetics of the relaxation of charge carriersin these platelets being insufficient. Therefore we developeda stable and repeatable synthesis procedure for obtaining ul-trathin nanoplatelets and studied their optical characteristicsto show that these nanocrystals will allow to broaden the lineof pure-colored semiconductor light emitters and enrich themwith devices operating in UV range, that would be extremelyuseful for medical lasers, as well as for integrating them in opti-cal fibers, microfabricated waveguides and lab-on-chip systems.

Synthesis, Characterization, Electronic andOptical Properties of The New Double Perovskite

BaSrMgWO6: Theoretical and ExperimentalStudy

Abderrahman Abbassi


The powder sample of double perovskite oxide BaSrMgWO6

has been elaborated by conventional solid-state reaction. Struc-tural and optical properties of this sample have been investi-gated. At room temperature crystal structure is face-centered

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cubic (space group Fm-3m with the unit cell a = 8.0173A).Using the diffuse reflectance UV-visible absorbance spectrum,the optical band gap of BaSrMgWO6 sample is 3.7 eV. Basedon Density Functional Theory (DFT), and using full Potential-linearized Augmented Plane Wave (FP-LAPW) method withthe Local Density Approximation and the Generalized Gradi-ent Approximation (GGA), implemented in the Wien2k pack-age, we have investigated electronic and optical properties ofsuch material. The optical band gap obtained with GGA ap-proximation is equal to 3.7 eV, which is in good agreementwith our experimental results. We found that transmittance Tis stable and reaches the average of 80% in both experimentaland theoretical studies.

Memories based on ion migration effect

Tomas Hrbek

Charles University, Prague

Current RAM memories, which are used for example in per-sonal computers, are at the edge of the limits of miniaturiza-tion. Thus there is a need of developing new memories thatare able break this limit. We are going to present CB RAMmemories chalcogenide. These memories are based on creat-ing and destroying of conductive filament in chalcogenide elec-trolyte between two electrodes. Firstly, we need to preparechalcogenide glass from the chosen materials. Usually we usesome combination of Ag, As, S, Se etc. The layer of the elec-trolyte has to be thin. To do so we can use various methodsas flash evaporation, vacuum evaporation, thermic evaporationetc. Advantages of this memories are for example higher den-sity of stored information due to possibility to store more thanone bit of information per one filament, no need of energy to

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keep written information written and higher resistivity againstradiation; as a consequence, there is an option of using themin space. Our goal was to prepare working sample and findout which combination of chalkogenide is most suitable for CBRAM memories. We tested samples which we’d created andwe compared the results of measuring with the theoretical pre-dictions.

Production and characterization ofgalwanotechnichnical layers on the basis of

chlorides and metals block D

Joanna Jab lonska


The world and society in accordance with the latest trendsstrives to minimize and exclusions of substances having a harm-ful effects on the environment and living organisms. Both,industry and science, not only search for new technological so-lutions, but also puts special attention on the implementationof the new standards in the case of commonly used techniques.Thanks to the analysis of the chemical composition of the elec-trolytic bath, conducting experiments to investigate the effectof chemical composition and concentration of the substanceused, it will be possible to extend the fictionalization of elec-trolyte and reduce the amount of harmful substances neededto obtain the layer. In view of the specific properties of alka-line electrolytic bath, there have been selected elements witha block D, like copper. These elements, which are also calledtransitional metals, are characterized by an incompletely filledshell d. For the manufacture of thin layers the process of elec-troplating was applied. Even in this day and age, electroplatingis one of the best opportunities to obtain the perfect shell. This

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process is used, inter alia, in the formation of coatings that pre-vent corrosion. One of the most commonly used metals duringelectroplating is chrome, which is primarily used for the coatingof tools used in the workshop. Protects metal surfaces chromefrom mechanical damage and significantly affects the reductionof adhesion of the tool.

Synthesis and Characterisation of Metal-SiliconOxides

Ewelina Nowak


Metal-silicon oxides complexes find more and more applica-tions in functional material engineering. One of the easiest wayto produce such material with nanometric precision is sol-gelmethod, which biggest advantage is its simplicity and relativelow process cost, what makes the method great for apply inmost fields of industry. Presented method consist stages suchas chemisorption of alkoxide, rinsing, hydrolysis and drying.Accordingly, fully crystallized ZnO2, AgO2 and TiO2 materialswere synthesized by replacing the hydroxyl group with methylsiloxyl. The main purpose of the work is to characterize the ob-tained materials in terms of chemical composition, crystallinebonds and crystal structure using Raman spectroscopy map-ping. For the analysis of physical properties, microscopic andspectroscopic measurements were carried out using AFM andSTM. Due to predicted semiconductor and magnetic propertiesmeasurement of I-V characteristic were performed.

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An Enhancement Of Photoluminescence FromPbS Quantum Dots By LSPR In Semiconductor

Nanocrystals

Anton Babaev

ITMO University

The Cu2-xSe nanocrystals (NC) and the PbS quantum dots(QDs) with close frequencies of the localized surface plasmonresonance (LSPR) and the exciton state were applied to ob-serve an enhance of QDs photoluminescence in various organicand inorganic matrices. An important advantage of QDs overorganic dyes is that we can use QDs of different sizes thus eas-ily changing the resonance conditions of the plasmon-excitonsystem. Thus, we observe the different states of the plasmon-exciton system in the strong couple regime. We achieve the21-times enhancement of the QDs photoluminescence in non-porous silicate matrix after plasmonic NC embedding. In ad-dition, we have observed the change in the shape and positionof the PL spectra as well as PL decay time reduction. Thenon-resonant excitation of this sample shows the same behav-ior with lower enhancement factor. We believe the change inthe spectra is related to the Rabi splitting arising in the strongcoupling regime or to the influence of LSPR on QDs radiativestates. Thus, our experiment proves the effectiveness of theusing plasmonic NC for practical applications and provides avaluable data for basic research.

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III-V racetrack microlasers with InAs/InGaAsquantum dot active region

Ildar Nabiullin

St Petersburg Academic University

To improve the coupling between the microring resonator andthe output waveguide, insertion of a straight section in thecoupling region is utilized (the so-called racetrack geometry).Racetrack microlasers with the radii less than 3.5 µm basedon InAs/InGaAs quantum dot active region are fabricated bymolecular beam epitaxy and studied under optical pumping bymicrophotoluminescence method. The influence of the race-track geometry (outer and inner radii and length of the straightpart) on emission spectra and lasing characteristics at roomtemperature are studied. We have found that FSR decreaseswith the increase of the straight part of the racetrack. Thethreshold power increases with the straight section length (L),but it remains quite comparable with microlasers with L=0.Thus, high-quality microlasers with small foot-print and lowthreshold currents optimized for coupling to bus-waveguidesare demonstrated.

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Dual Active Galactic Nuclei in Merging Galaxies

Gerard Valentı Rojas

Universitat de Barcelona

Within the modern paradigm of galaxy evolution through hier-archical structure formation, active galactic nuclei (AGN) arebelieved to be a natural outcome of binary mergers betweenmassive galaxies as they trigger mass accretion into their cen-tral supermassive black holes. However, the reported frequencyof dual AGN is surprisingly low compared to current estimateson the merger rates of galaxies. In this work, we use idealisedsimulations of major galaxy mergers to predict what wouldbe their observed fraction when the observational limitationsinvolved into their detection are taken into account. A keyingredient in this modelling is the evaluation of the mergertimescale, which can vary substantially with the orbits, halospins and mass ratios of the merging objects. We propose analternative analytical expression for this magnitude which, forpairwise mergers, leads to more accurate predictions than ex-isting formulas.

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Band bending at surfaces and interfaces:metal-semiconductor contact.

Andreea Serban


The growth mechanisms of Pt and Cu on clean Ge(001) sub-strates were investigated by using ultrahigh vacuum techniques.The crystallinity of the surface was studied via low energy elec-tron diffraction (LEED). LEED patterns do not exhibit longdistance ordering. X-ray photoelectron spectroscopy (XPS)was used to investigate the band bending effects at the in-terface of Ge with the metals. Both contacts presented Ohmicbehaviors. Two theoretical models, consisting in the effectivemass variation or the conduction band broadening have beencreated to explain the behaviour of Pt/Ge(001), and both ofthem were verified by the Cu/Ge(001) contact.

Crystal growth and properties of binaryintermetallic ZrBi2

Zuzanna Sobczak


Single crystals of ZrBi2 intermetallic compound were grownby the self-flux method. Phase identity of the crystals wasexamined using powder x-ray diffraction (PXRD) and pat-terns were analyzed by means of the Pawley method with theTopas software. Material adopts the TiAs2 structure typewith lattice parameters: 10.2334(15) A, b = 15.581(2) A andc = 3.9945(5) A. Crystals of ZrBi2 were studied by meansof magnetic susceptibility, specific heat, resistivity and mag-netoresistance measurements. ZrBi2 is reveals a metallic-like

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behavior (RRR = 30) with high magnetoresistance. The Som-merfeld coefficient obtained from specific heat measurementsequals γ = 1.59(16) mJ mol−1 K−2 and the Debye temperatureΘD = 178(2) K. Low-frequency Einstein mode with ΘD ∼ 40 Kis seen in specific heat.

Assemblies of Thermoresponsive polymersmolecules hydroxypropylcellulose and

methylcellulose investigated by means of dielectricrelaxation spectroscopy

Andrii Ostapchuk

Taras Shevchenko National University of Kyiv

Aqueous solutions of hydroxypropylcellulose and methylcellu-lose with different polymer concentrations are investigated us-ing dielectric spectroscopy in a frequency range of 103 Hz to 105

Hz at temperatures from 10◦ C to 70◦ C. Assemblies of Ther-moresponsive polymers molecules hydroxypropylcellulose andmethylcellulose have or lower bound to a temperature range ofpartial miscibility, that investigated and shown in the diagrams.Relaxation processes in the systems explained by changes in thestructure of molecules.

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Fabrication of Ni(1.5 nm)/Cr(x nm)/Fe(2 nm)Magnetic Multilayers by PVD and investigationon Cr spacer thickness in oscillation exchange

coupling

Kimiya Pakravanan

Ferdowsi University of Mashhad

Ni/Cr/Fe multi-layers were deposited with different thicknessof Cr as spacer in pressure of 2 × 10−6 mbar by PVD facility.Structural and magneto-optical properties were investigated.X-Ray diffraction measurement exhibits preferred orientationof Fe(1 1 0), Cr(1 1 0) and Ni(1 1 1) for the multi-layer andincreasing in crystallization by increasing in spacer thickness.XRR characterization emphasises the periodic structure of themulti-layers and shows increasing in roughness by increasingin the spacer thickness. Magneto-Optical Kerr Effect (MOKE)measurements indicate the oscillation exchange coupling be-tween Fe and Ni layers.

Structural Properties & Metal Distributions onAbell 754 and Abell 520

Oguzhan Colkesen

Koc School

Clusters of galaxies are one of the brightest X-ray resources inthe universe. They give pieces of evidence for the questions;how the universe is expanding, how matter is distributed inthe space, as well as how gravitational waves are produced.The main X-ray emission from cluster of galaxies is comingfrom hot gas at the intergalactic regions at the clusters. Inthis study, Chandra X-ray analysis of two merging clusters of

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galaxies, Abell 754 and Abell 520 is presented. X-ray structuralanalysis of these galaxy clusters show the behavior of hot gasbetween galaxies, which is the main X-ray source, and mighthelp to understand how gravitational waves are created. Theciao 4.7 tool of Chandra X-ray observatory is used to performthe analysis. Spectral analyses of the clusters are done withXSPEC tool of Heasarc. X-ray spectra of Abell 754 and 520are produced and line emissions are studied to reveal metaldistribution at the hot gas between the galaxies. Also in thisstudy, Chandra X-ray analysis of two merging clusters is stud-ied and presented to explain their structures by comparing soft,medium and hard X-ray properties.

Current driven domain wall creation inferromagnetic nano-wires

Nils Sommer

Johanes Gutenberg Universitat Mainz

A central topic in spintronics, i.e. the field in physics whereone exploits the spin of an electron in addition to its charge,is the manipulation of magnetic textures by currents. In a re-cent work it was predicted that magnetic domain walls can begenerated in a ferromagnetic nano-wire by means of an elec-tric current once there is an inhomogeneity. In particular theauthors focussed on a set-up where the magnetization of theferromagnetic wire was mainly aligned along the wire. Onlythe magnetization at one end of the wire was fixed along aperpendicular direction. It has been shown that above a cer-tain threshold current density domain walls are injected intothe nano-wire with a period that is controlled by the currentstrength.

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During my Bachelor research we have analysed the influenceof the orientation of the fixed magnetization at the end of thewire. We have shown that while reducing the tilting anglethe threshold current above which domain walls are shedded isincreasing. Decreasing the tilting angle to zero we were able torecover the ferromagnetic instability.

Split & Delay Photon Spectroscopy with VisibleLight

Verena Markmann

University of Hamburg

Conventional methods such as Dynamical Light Scattering (DLS)techniques are limited by the framerate of the detector. A dou-ble pulse approach for Photon Correlation Spectroscopy (PCS)presents a possibility to overcome this issue. With short pulsesprovided by an Acusto-Optic Modulator (AOM) determiningfast dynamics of colloidal systems becomes possible.

We aim for an automatized setup for double pulse corre-lation. A rotational motor stage for the detector has alreadybeen installed to provide the precision needed for determiningthe q-range of the measurements. Furthermore a mechanismfor additional temperature control of the sample is being de-signed to examine temperature dependent colloids, for exam-ple Poly(N-isopropylacrylamid) (PNiPAM), and other particleswith fast and/or complex dynamics.

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Materials in flatland: beyond graphene

Aleksandra Bojar


Two-dimensional materials exhibit much different propertieswith comparison to their bulk counterparts. Best-known 2Dmaterial – graphene – was first obtain via mechanical exfo-liation from bulk crystal (graphite) in 2004 by Andre Geimand Konstantin Novoselov. Scotch tape exfoliation technique,though not being a good method for scalable production, is stillthe best way to obtain highquality monolayer crystals for sci-entific research. Graphene, despite its outstanding electronicand mechanical properties, has limited applications due to itszero bandgap. This limitation can be overcome with semicon-ducting Transition Metal Dichalcogenides (TMDCs), which likegraphite are layered materials. Their bandgap can be tunedby changing the number of layers. They exhibit a transitionfrom indirect to direct bandgap when the number of layers de-creases down to one layer. This poster focuses on monolayermolybdenum disulphide, obtained via Scotch tape exfoliationmethod, and its properties characterisation by means of opticalmicroscopy, Raman spectroscopy and photoluminescence.

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Linear dynamics for superfluid vortex formation:the case of the “snake” instability of a grey soliton

in a two-dimensional Bose-Einstein condensate

Alexej Gaidoukov

Technische Universitat Kaiserslautern

The non-equilibrium formation of superfluid vortices in a di-lute Bose-condensed gas is a dramatic phenomenon, but itsexact description requires nonlinear quantum field theory (in-teracting quantum many-body dynamics in second quantiza-tion). The nonlinear classical dynamics of vortex formation canbe described within the Gross-Pitaevskii nonlinear Schrodingerequation, but quantum effects are difficult to compute beyondthe simple Bogoliubov-de Gennes linearization. Here we show,however, that vortex formation does not always require non-linear dynamics. If the vortices form in a region where thecondensate density is low, they may appear without significantnonlinear evolution, even though their appearance changes thecondensate wave function topologically. We confirm this by di-rectly comparing linearized and nonlinear classical evolution asvortices form from the so-called “snake” instability of a greysoliton in a two-dimensional condensate.

We find that linearized and fully nonlinear evolutions re-main close until well after vortices have appeared. This obser-vation opens the door to a fully quantum mechanical descrip-tion of superfluid vortex formation, within the easily quan-tized linear Bogoliubov-de Gennes theory of small perturba-tions around a background mean field.

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Spectroscopic characteristics of metalloorganiccomplexes from the Fetriazole family of

compounds

Ma lgorzata Rudnicka


A part of transition metal complexes with octahedral symme-try has the ability to switch the spin state of their central metalion. Such effect, called spin crossover phenomenon (SCO),can be achieved by applying external stimuli to those mate-rials. It can be caused by a change of temperature, pressure,electromagnetic radiation, electric or magnetic field. Eventu-ally, spin switching causes alterations in electronic frameworkof the whole complex, which explains different chemical andphysical properties between a low-spin (LS) and a high-spin(HS) state. Both states can be distinguished from one an-other by measuring their magnetic, optic and structural char-acteristics. Fe-triazole complexes are a specific type of com-pounds family exhibiting SCO effect. Their general formula isgiven as [Fe(Rtrz)3]A2·nH2O, where R – substratum other thaniron, trz – 1,2,4-triazole ligand or its derivative, A – opposedion. In this work three complexes with similar structure werestudied: [Fe(NH2trz)3](NO3)2, [Fe(Htrz)2trz]BF4 and [Fe(tert-trz)2(H2O)4]·2H2O. Raman and UV/VIS spectroscopy were usedto analyse samples. Raman spectra were obtained by applyinglaser light at 514 nm wavelength. Wavelength range for absorp-tion spectra was 200-900 nm. During the whole measurementprocess samples were in powdered state. The research con-firmed that at room temperature all three samples are in LSstate. Moreover, it helped to establish that the complex of[Fe(tert-trz)2(H2O)4]·2H2O belongs to the Fe-triazole family ofcompounds with SCO effect.

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Scanning electron microscopy methods in study ofmicro objects

Iuliana Taran


The investigation of different materials and objects in the mate-rial science and in other fields and technologies requires the useof scanning electron microscope (SEM). As example, it can beshown the use of SEMs in chemistry, material physics, biologyand nanotechnology. The aim of this work is the researchersacquaintance with scanning electron microscope and the studyof methods for investigating samples using the SEM. Duringthe process of using the SEM it is possible to observe thatthe samples consist of different materials. In case the non-conductive specimen is investigated it is necessary to cover itwith conductive layer. Electron microscopy is helpful for of-fering information regarding the elemental composition by col-lecting the X-Ray characteristic radiation spectrum. In thisposter it will be also shown some photos with samples like saltparticles, natural dark hair, blonde dyed hair, simple eyelash,mascara eyelash which was investigated with SEM and pho-tos with investigation of Z-contrast for different elements likecarbone tape, gold layer and copper band.

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Density of states calculation with Wang-Landaualgorithm

Ana Milinovic

University of Vienna

My aim was to try to replicate the results obtained in theoriginal paper. Ising 1D model was calculated first and checkedanalytically. Second, Ising 2D model was simulated and Wang-Landau algorithm was used to calculate the density of states.Poster will discuss the results and how they agree with theresults from the original paper. How algorithm converges willbe discussed. Ising 3D and Potts models and calculations willbe investigated.

Concept of Volatile Organic Compounds Analyzerfor ISS Atmosphere Monitoring

Anastasiya Annenkova

Moscow Institute of Physics and Technology

International Space Station (ISS) Atmosphere is an isolatedand regenerated, as a result atmosphere contains many volatileorganic compounds (VOC). For example, compounds such asammonia, Freon or formaldehyde have a great negative im-pact on astronaut’s health. Therefore, a lot of timely controlon them in the atmosphere is required. Nowadays, astronautshave special absorbents for accumulation of harmful substanceswhile they are in the ISS. After the homecoming of astronauts,the absorbents were explored in the specialized laboratoriesusing gas chromatography and mass spectrometers. The ac-curacy of these methods is high, but their complexity and the

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need for maintenance don‘t allow them to be used in the or-bit. The aim of this paper is the development of the ISS at-mosphere monitoring system. Spectrometric methods are themost useful for solving this problem. The main problem isthat the spectra of heavy organic molecules are not resolvedand overlapped. Therefore, it‘s necessary to provide a widespectral range (8-11µ) to effectively identify individual com-pounds. Usually this task is solved by Fourier spectrometers.But Fourier spectrometers, which can be used in the orbit,has too low spectral resolution (0,5 cm−1) to resolve individualnarrow spectral features. In this paper we propose to use cav-ity enhanced laser spectroscopy method using cavity quantum-cascade laser (EC-QCL). Modern quantum-cascade lasers canprovide a wide spectral range (8-11µ) for hundreds of millisec-onds. The laser line width doesn’t exceed a few megahertz,which provides a high spectral resolution (<0,001 cm−1). Itis also important to accurately measure the absorption of thecontinuum due to the overlapping of the compounds spectrumsover the entire spectral range. These are the reasons we aregoing to use cavity ring-down spectroscopy (CRDS) with aneffective optical path of 140-280 meters depending on the spec-tral range. It is early stage project and we present an opticaland general scheme of spectrometer, sensitivity estimates anddynamic range on the conference.

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198

Nuclear Physics

Absolute differential cross section for elasticelectron scattering on Argon atom

Jelena Vukovic

University of Belgrade

This paper presents the results from experimental research ofinteraction of electron with argon atoms. The goal of the ex-periment, whose results are presented in this study, was tomeasure the differential cross section for elastic electron scat-tering on argon atom in an angular range from 20◦ to 121◦, forincident electron energies 50eV, 100eV, 150eV and 200 eV. Themeasurements of differential cross section are performed in thefunction of scattering angle, at a fixed incident electron energy.Measured relative cross sections were brought to the absolutescale with the help of known referent absolute sections by us-ing relative flow method, where as the referent gas was usedhelium. The results, tabulated and graphically presented, werecompared with the results of other autors, where they observedgood match for almost all values of scattering angle. The pa-per describes the experimental settings of device: an electrongun and analyzing system, the experimental measurement pro-cedures for relative and absolute effective cross sections, wherespecial attention is given to the measurement of absolute crosssection using relative flow method.

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Other InterestingTopics

The amazing life of Physics students in Portugal

Melissa Serra

University of Lisbon

Portugal is now a top touristic destination since most of ourcoast is made of beautiful beaches and landscapes. We have agreat weather and nice people with different unique traditionsall over the country. We have a wide variety of fantastic tra-ditional food, our wine Vinho do Porto and the unique musicstyle Fado is worldwide recognized and prized. What aboutPhysics? And physics students? Our university life is also pe-culiar. We have the student welcome ceremony and activitiescalled Academic Praxe that are unique and do not exist in othercountries, academic weeks and a unique student spirit.

In this poster, we would like to discuss how is the physicsstudent university life in Portugal, and to answer the questionsof what drives Portuguese young students to follow physicsuniversity degrees, what are their main difficulties, interestsand hobbies, what is the branch of physics they are interestedin for future work, perspectives, etc. Overall, we are hopingto show and share the amazing life that we, physics students,have in Portugal, such a small country at the southwest cornerof Europe

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Classical musicians and Physics students: onepassion, two worlds

Alfonso Lopo

University of Lisbon

Can music be described as a packet of waves with different fre-quencies created by different instruments? Can we fully repro-duce a song with one computer? Being two classical musiciansand physics bachelor students, we are proposing to compose anoriginal song using our own instruments, a transverse flute anda cello, play it and recreate it using digital instruments. Ourmain goal is to show why machines cannot replace a musician,but can really help to better understand and improve our skillsand living. In this work, we will analyse the results given by thedigital methodologies in term of its spectral analysis and willprovide a scientific and artistic interpretation of the results.

The Entropy of Economics: Calculating EconomicInequality through Statistical Mechanics

Anmol Lamichhane

Earlham College, USA

Have you heard of the 1%? Can we use thermodynamics andstatistical mechanics to predict and understand economic orother socio-political inequalities that leads to the creation ofthe 1% class? I present various statistical mechanics modelsthat could be used to better understand such inequalities.

202

Aramis: data science applied to cyber security

Davide Bernardi, Federica Bisio, Pierangelo Lombardo, AlanPerotti

aizoOn - Technology Consulting

Data science techniques applied to the cyber security do-main allow for a novel approach to the detection of many typesof anomalies, such as attacks, malware, and users? abnormalbehavior; this approach offers new possibilities to better au-tomate the security process. The proposed framework, calledaramis (Aizoon Research for Advanced Malware IdentificationSystem), detects such anomalies by employing both a humandriven and a data driven point of view. The first is realisedthrough a set of advanced cyber security analytics, which au-tomate the analysis of cyber security experts, allowing to au-tomatically and exhaustively analyse companies network data;the latter is implemented via an unsupervised machine learningengine, which is able to build models of the normal behaviourof the network. The two approaches together allow to obtaina complete and detailed information about all kinds of anoma-lies in the network, thus leading to the detection of risks andthreats.

203

A multidimensional graph approach to workplaceanalytics

Davide Bernardi, Claudio Borile, Riccardo Rinaldi, AnnaVelyka

aizoOn - Technology Consulting

Statistical physics-based models have proven to be a veryeffective tool to study complex interdisciplinary problems. Aparticularly challenging and important question is to under-stand how to extract quantitative information and global pat-terns from the apparently unstructured and noisy interactionsbetween people in a society. Data-driven approaches and com-putational methods play a central role in these kind of analy-ses, due to the probabilistic nature of the underlying “micro-scopic” processes and the large amount of complex interactionsthat make analytical approaches impractical. Here we will con-sider the case of the “Enterprise Social Graph”, where we an-alyze the topological structure of the network of informal in-teractions and collaborations within the workplace consideredas an open system, combining computational sociology withstate-of-the-art quantitative methods to extract global and lo-cal properties (e.g. communities, individual roles, structuralbottlenecks and key players). All these aspects emerge fromthe global self-organization of all the interacting microscopicagents from simple and local interactions, naturally modeledas a time-dependent multidimensional graph (multiplex) ob-tained by experimental data from different sources like mailexchange datasets, organizational charts, and ad hoc surveys.

204

Particle Physics

Navigating the Hidden Sector: Designing theSHiP Experiment at CERN

Oliver Lantwin

Blackett Laboratory, Imperial College of Science, Technology &Medicine, London

Particle physics is stuck at an impasse: We have found noth-ing but the Higgs, and Supersymmetry (SUSY) is nowhere tobe found. But the neutrino masses, dark matter and the factmatter overcame anti-matter to create the universe, prove thatthere has to be new fundamental physics, and that there haveto be new particles, somewhere. But they have not been foundat the Large Hadron Collider (LHC), nor has anything beenseen by direct detection experiments for dark matter nor byprecision tests of the standard model (SM). And without anenergy scale to target the justification for any new collider isweak. So where else can we look? The Search for Hidden Par-ticle (SHiP), is a proposed experiment to study a wide range ofmodels invisible to our current experiments. To test these mod-els with super-weakly interacting particles we need to solve anexperimental contradiction: We need to achieve an extremelylow background environment, while working at extremely highintensities. How we can overcome this experimental challengeand is the main topic of this poster.

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Scintillating Bolometer Monte Carlo for RareParticle Event Searches

Nicholas Deporzio

Northeastern University

This study uses the Geant4 physics simulation toolkit to char-acterize various scintillating bolometer constructions for poten-tial experimental commissioning. Emphasis is placed on detec-tor sensitivity to neutrinoless double-beta decay. Constructionsminimally include a scintillating source material for the decayand an absorber material. Tellurium, Selenium, Germaniumand other candidate isotopes are studied as source materials.Various background discrimination techniques are analyzed in-cluding reflective housings and anti-reflective coatings upon thesource material. Different geometric optimizations are consid-ered. Ability to discriminate incident alpha and beta radiation,as well as photon detection efficiency for each construction ispresented.

Λb → J/ψφΛ decay and search for the exotichadrons

Julia Tena Vidal

Universitat de Barcelona

We study the weak decay of the Λb into J/ψφΛ states and thepossibility of exotic hadrons production in the final state in-teraction of J/ψΛ and J/ψφ hadrons. The elementary weaktransition at the quark level proceeds via the creation of a J/ψmeson and an excited sud system with I = 0, which uponhadronization leads to φΛ and KN pairs. These pairs un-dergo final state interaction in coupled channels and end up as

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an observed φΛ pair. The hidden-charm pentaquark Pc(4450)observed recently by the LHCb collaboration may be of molecu-lar nature, as advocated by some unitary approaches that alsopredict pentaquark partners in the strangeness S = −1 sec-tor. This strange hidden charm pentaquark can be producedvia ψΛ final state interaction in our reaction and, as we shallsee, such a state could be seen in Λb → J/ψφΛ decay as apeak in the MJ/ψΛ invariant mass distribution. On the otherhand, studying the Λb decay as a function of J/ψφ invariantmass, MJ/ψΛ, one can also observe the peaks corresponding toX(4140) and X(4274) exotic hadrons discovered by CDF andrecently reconfirmed in the B decay at LHCb.

Analysis of tt background production inH →W+W− → l+l−νν processes in the CMS

experiment at LHC

Rudy Ceccarelli


The discovery of a new boson, compatible with the Higgs bo-son expected by the Standard Model, has been announced byCMS and ATLAS collaborations in 2012. After the discov-ery, the properties of this particle have been studied in variousdecay and production channels, to verify the agreement withthe theory. From 2015 the energy of proton-proton collisionsat LHC has been increased to 13 TeV, so the higher statisticshave permitted a deeper study of the Higgs boson. The studymade by CMS in the decay channel is one of those activities.One of the most significant backgrounds of this channel is thett production, characterized by the presence of quark b in thefinal state: tt → W+W−bb. This work is about the study ofb-tag procedures, that is the algorithms that can distinguish

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the jet produced form quark b from those produced by lighterquarks or gluons.

Solar Neutrino Oscillations

Valentina Biancacci

University of Trieste

Today we know the neutrino is an elementary particle with-out charge, with spin 1/2, and it has very small but finitemass. Neutrinos interact only via weak interactions and be-cause of this they can be detected only with considerable dif-ficulty. They come in three flavors: electron neutrinos (νe),muon neutrinos (νµ), and tau neutrinos (ντ ), associated withthe electron, muon, and tau, respectively. The Standard Modelof particle physics (it explains the nature laws with a finitenumber of elementary particles and interactions) had assumedthat neutrinos are massless and have a definite flavor. However,if neutrinos had mass, they could change flavor, or oscillate be-tween flavors. This neutrino oscillation was the solution of theSolar Neutrino Problem. It consists in a discrepancy betweenmeasurements of the number of solar neutrinos flowing throughthe Earth and the real number of neutrinos produced by theSun. The theoretical models of the solar interior predicts thatthe Sun should emit only electron neutrinos as they are pro-duced by H-H fusion. The measured rate of electron neutrinoflux is much smaller than the expected rate and it was ex-plained by neutrino mixing. The neutrino flavour states νe, νµ,and ντ are linear combination of three mass states ν1, ν1, ν1.As a neutrino propagates in time, the phases of the three massstates become different due to the slight differences in the neu-trino masses. A different mixture of mass states correspondsto a different mixture of flavor states.

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Physics Education

Physics Brawl, Online Physics Brawl and itsInfluence on the Physics Education

Daniel Dupkala

Charles University

This contribution presents competitions in solving physics prob-lems organized by students of physics at Charles University.Physics Brawl is an international team competition for highschool students in solving physics problems. The teams consistof up to five high school students or sometimes even youngergifted pupils. The goal is to solve as many problems as possi-ble in time period of three hours. At the beginning, the teamgets 7 problems. For each one solved, the team gets a newone. The Online Physics Brawls is almost identical competi-tion, only difference is the online form. The age of contestantsinfluences coverage of physics topics used for tasks and thetheir difficulty. The best teams solve in average 40 of morethan 50 originally created problems. Mechanics covers almost50 percent of all problems as it is the main topic in high schoolphysics. Remaining problems are mostly from fields of electro-statics, optics, quantum and relativistic physics. The difficultyof task is raised by every new assignment and some of the lastproblems even cover the basics of college physics. Goal of thispresentation is to show the contribution of competitions to theeducation of Physics, its improvement and popularization.

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Quantum Physics andTechnology

Basic Circuits of a Quantum Optics Network

Marco Canteri

University of Trento

The poster will present some basic circuits of a quantum op-tics network. Some configurations of waveguides and microres-onators, where non linear optical effects occur, can be used asa source of energy-time entangled photons. Due to the low de-coherence effects to which photons are subjected, these circuitshave emerged as a leading approach to quantum informationprocessing.

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Ultrafast Dynamics in a Quantum FluidEnvironment

Sascha Ranftl

University of Technology, Graz

Based upon the works of Ahmed Zewail (Nobel Prize 1999),the field of femtochemistry is nowadays an established field ofscience, studying ultrafast dynamics in molecules and reactionsthat take place within femtoseconds. The development of ultra-short laser pulses enabled the direct observation of molecularprocesses, e.g. photodissociation. Apart from femtochemistry,cold droplets of noble gases provide a micro-solvation environ-ment for atoms and molecules, bridging from gas phase to liquidstate. The goal of our experiment is to observe ultrafast dy-namics not in molecules, but in doped droplets. On this poster Iwill present measurements on ultracold superfluid helium nano-droplets (0.37 K) doped with single indium atoms studied witha femtosecond pumpprobe setup and photo-electron time-of-flight spectroscopy

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Open quantum systems dynamics andmeasurement process

Guido Giachetti

Unversita degli studi di Firenze

Quantum mechanics require a postulate that describe theprocess of measurement (interaction with a macroscopic de-vice) through a postulate that introduce ad hoc interactionand breaks the deterministic structure of the theory. Our aimis to mend this sharp break between macroscopic and micro-scopic world by providing a quantum description of the mea-surement process. In our work the dynamical interaction be-tween the system and the measurement device, regarded asquantum object, is described by an effective hamiltonian: weshown that, in some particular settings, the macroscopic char-acter of the measurement device lead to a decoherence process,essential condition to connect the outcome of the device to thestate of the system, and allow the whole measurement process.In particular we used two different ideal measurement devices:one made up of a macroscopic number of a quantum two levelsub-devices, and one composed by a single spin s system, inthe limit of large s.

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Bell’s inequality

Alessandra Beni


The formalization of Quantum Mechanics challenges some hy-pothesis considered fundamental in classical physic. The ideathat a system could be simultaneously in many states is in con-trast with our common sense. Einstein supported the idea thatthe probabilistic nature of measurement processes arises froman incompleteness of our description. This idea was considereduseful to recognize Quantum Mechanics as a classical theory,although it was incomplete. The Bell’s Theorem’s demonstra-tion made possible to verify experimentally if this idea couldcorrespond to the reality or not: a violation of Bell’s inequalityexcludes the possibility of Quantum Mechanics to be a classicaltheory. In my work I gave an extremely general demonstrationof Bell’s Theorem, based on properties of probability distri-bution. I also showed how it is possible to verify a violationof Bell’s inequality, making local measurements of three spincomponents on two electrons in a singlet state, that were sentto two different apparatus. This is experimentally very hard torealize. For this reason I also gave a description of the logicalscheme of a new class of thought-experiment.

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Theoretical Physics

Minimal configuration in simplicalquantumgravity with toroidal topology

Daniel Nemeth

Eotvos Lorand Science University

Numerical methods are playing an important role in the mod-ern time’s science, without them many approaches and resultswould be unreachable. To understand the structure and be-haviour of the lattice-based systems (like CDT) one can userandom walks via Monte Carlo simulations and measure somereasonable observables with the help of it. The recent researchin CDT has shown that the choice of topology of the spacetimematters, and under toroidal condition we found an interest-ing behaviour of the system. After letting the system shrink,instead of reaching the minimal triangulation surprisingly itbecame smaller. This small system still keeps the attributes ofthe toroidal condition.

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Semiclassical descritpion of the triaxial rigid rotor

Robert Poenaru


A triaxial rotor Hamiltonian is treated by a time-dependentvariational principle, using a coherent state as a trial function.The critical points of the constant energy surface depend onthe ordering relations satisfied by the three moments of iner-tia. All three orderings are considered and to each of them aspecific wobbling frequency is derived. The transition betweentwo distinct phases is discussed in terms of a cranking Hamil-tonian. Four distinct pairs of complex canonical phase-spacecoordinates are pointed out. Each of them yields, after quanti-zation, a distinct boson expansion for the angular-momentumcomponents. The separation of the potential energy is treatedfor one of the four phase-space bases. One of the semiclassicaldescriptions is used for the yrast state energies of 158Er andan excellent agreement with experimental data is obtained upto very high angular momentum.

Constructive gravity in a nutshell

Florian Wolz

Friedrich-Alexander-University Erlangen Nuremberg

Since the 1970s it is clear that the laws of gravity can be de-rived merely by enforcing that the causality of geometry – thegravitational field – has to coincide with the causality of allmatter fields. Otherwise it would be impossible to consistentlydescribe measurements in a common, predictive setup. In re-cent years it was possible to extend this to arbitrary geome-tries. The resulting system of partial linear differential equa-tions, the gravitational construction equations, determine the

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coefficients of the gravitational Lagrangian as their solution.Recently, these equations have been used to construct a per-turbative solution beyond general relativity, allowing for thephenomenological effect of birefringence of light in vacuum. Wewill present some of the effects that arise in this setting andpossible influence on experimental measurements.

The A-square problem and its relevance in theDicke superradiance

Francesco Bollati

Universita degli Studi di Milano

The Dicke model is the simpliest model describing an ensembleof N two-level atoms, in an optical cavity, interacting with anear resonant mode of the electromagnetic field. One of themost interesting results regarding this model is that for a suffi-ciently large value of the coupling constant between the atomsand the field, the system undergoes a second-order phase tran-sition. Tuning the temperature below a certain critical tem-perature Tc the system converts from a normal phase, in whichthe intensity of the spontaneous emission of radiation is pro-portional to N , to a “superradiant” phase in which the sys-tem emits spontaneous coherent radiation with intensity pro-portional to N2. This phase transition is called superradiantphase transition (SPT). But if the A2 terms are included in theHamiltonian of the system, no-go theorems are proved that for-bid the SPT, hence the SPT appears as an interesting artifactarising solely from the absence of the A2 terms from DickeHamiltonian. In my poster I’m going to show how the problemof correctly deriving the Dicke Hamiltonian and justifying theexistence of the SPT have been faced in literature.

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218

Author Index

AbbassiAbderrahman, 180

AbdelmajidKadiri, 179

AllisonW., 87

AndersonGreg, 40

AnnenkovaAnastasiya, 31, 196

AntonKomarov, 170

AymanMaha, 178

BorcsokJudit, 45

Baba OuldA., 162

BabaevAnton, 184

Bahreini JangjooShahab, 56

BamaaroufOmar, 162

BanjaraBishal, 102

Beni

Alessandra , 214

Berekmeri

Evelin, 53

Bernardi

Davide, 203, 204

Bhattarai

Binod, 66

Biancacci

Valentina, 208

Bisio

Federica, 203

Bleotu

Petrisor Gabriel, 127,170

Bles

Bellona, 102

Blixt

Daniel, 133

Bojar

Aleksandra, 192

Bollati

Francesco, 217

Bonus

Tomasz, 69

Borile

219

Claudio, 204Botta

Oana Daciana, 52Bouganssa

Issam, 67Bozkurt

Mustafa, 146Broeren

Freek, 95Budzik

Kasia, 136Butoi

Bogdan, 120

CakoSarolta, 101

CanteriMarco, 122, 211

CarstensenJan Peter, 138

CatalanoJacqueline, 39

CeccarelliRudy, 207

Costa BoqueteAdrian, 94

CraneStuart, 51

DawarManik, 135

DeporzioNicholas, 109, 206

Dickmann

Jannis, 75Dogu

Demirtas, 155Dragowski

Micha l, 131Dumont

Tom, 76Dupkala

Daniel, 209

EcksteinTimo, 112

ErnstW.E, 87

Everschor-SitteKarin, 190

EZ-ZahraouyH., 162

FideraBartosz, 162

FilipAlexandru-Ferencz,

149Forcellini

Nicolo, 176Frassati

Federica, 147

G ladyszPiotr, 126

GaidoukovAlexej, 193

Ganea

220

Maria-Larisa, 145Gelli

Viola, 151Giachetti

Guido, 213Gieysztor

Maria, 121Gombar

Sonja, 126Goncalves

Ana Jorge, 49Gronow

Sabrina, 38Gupta

Abhishek, 70, 167

HumeyraCengiz, 155

HahnWiebke, 65

HamburgerRene, 77

HavukainenJoona, 61

HedemakiJussi, 42

HegedusDavid, 109

Horvath Benedek, 62Hrbek

Tomas, 181

IonescuAlina Marinela, 174

Jab lonskaJoanna, 182

JacomeDavid, 117

Jacqueline MarieBorgers, 83

Jelic-CizmekGoran, 106

JohnsonErik, 32, 143

KonyeViktor, 90

KarpinskiMicha l, 124

KaszasBalint, 57

KatsiampaMaria, 116

Kis-TothAgnes, 148

KolarKarel, 115

KormilinaTatiana, 179

KrausP., 87

Kunsagi-MateSandor, 38

LamichhaneAnmol, 58, 202

LamzabiA., 162

221

LangeJulia, 139

LantwinOliver, 112, 205

LeibungutBettina, 82

LewandowskaIga, 169

LinkeYannick, 100

LombardoPierangelo, 203

LopoAlfonso, 201, 202

LozanoDaniel, 152

LukasGrzegorz, 59

MateMihaly, 136

MamiyevZamin, 80

MarianiSaverio, 110

MarkmannVerena, 191

MatalonAriel, 113

Matti Alatalo, 84Mecaj

Bianka, 107Meladze

Lia, 46

Meneses-PonceCecilia, 100

MesserTobias, 128

MicicNemanja, 126

Mier GonzalezCristina, 150

MihaiFelicia, 156

MilinovicAna, 53, 196

MitreskaBiljana, 88

MusicValeria, 171

MykhaylovaValeriya, 138

NemethDaniel, 134, 215

NabiullinIldar, 185

NacuMaria-Alexandra, 158

NagyPeter, 94

NeaguAlexandra, 108

NistorescuAlexandru, 35

Nodar VillaAlvaro, 174

Nolte

222

Christina, 75Nowak

Ewelina, 183

OguzhanColkesen, 189

OneaMelania Loredana, 173

OpryshkoBohdan, 161

OstapchukAndrii, 188

OzudogruOzgur Can, 33

PeterffyGabor, 60

PakravananKimiya, 189

PaleschkeMaximilian, 74

PerottiAlan, 203

PeszkaJoanna, 97

PikeFraser, 34

PoenaruRobert, 60, 216

Prieto-PenaJuan, 48

PusterhoferMichael, 87

Rachadi

A., 162Raiss

Abderrahim Ait, 73Ranftl

Sascha, 91, 212Rattenbacher

Dominik, 122Rauter

Robert, 88Ravina

Baptiste, 107Rimo

Eetu, 166Rinaldi

Riccardo, 204Rokhmanova

Tetiana, 89Rokn Abadi

Mahmud Rezaei, 189Roman

Marta, 175Rozgonyi

Kristof, 37Ruckhofer

A., 87Rudnicka

Ma lgorzata, 194

SaradiAndras, 55

SørensenPhilip, 42, 144

SaloAdrian, 47

223

Saressalo

Anton, 105

Sbai

Younes, 172

Scala

Giovanni, 123

Schied

Monika, 104

Selcuk

Isil, 152

Serban

Andreea, 187

Serra

Melissa, 201, 202

Shuntov

Marko, 79

Sieso Ortiz

Raimundo, 99

Simionescu

Octavian-Gabriel, 86

Sitte

Matthias, 190

Sosnicki

Filip, 124

Sobczak

Zuzanna, 187

Sobotta

Andre, 91

Sokhashvili

Mikheil, 137

Sokolovskiy

Andrey, 157

Solymos

Adrian, 132Sommer

Nils, 190Sonmez

Yigit, 144Sotelo

Lamborghini, 125Sroda

Aleksandra, 133Stark

Ildiko, 50Stein

Enrico, 78Stolarczyk

Nikodem, 92Stupar

Nikola, 41Szo ldra

Tomasz, 78

TamtoglA., 87

TaranIuliana, 195

TeixeiraSofia F., 85

Tena VidalJulia, 206

TsereteliGiorgi, 70

UtzDominik, 103

Valentı Rojas

224

Gerard, 186Vami

Tamas Almos, 111Vano

Lilla, 119Velyka

Anna, 204Vujinovic

Olivera, 101Vukolova

Anastasiia, 170Vukovic

Jelena, 199

Wiciak

Agnieszka, 177Wolba

Benjamin, 93Wolz

Florian, 216Woods

Dewan, 81

YangJenny, 48, 159

ZahariaDaniela, 165

ZsidiGabriella, 36, 153

225

Documents

ICPS 2017 - AISF · Booklet. ii. Welcome Address Dear participant, With nearly 200 contributions, the 32nd International Con-ference of Physics Students boasts one of the richest