EWGAE 2016

32nd European Conference on Acoustic Emission Testing

Prague, Czech Republic

September 07th - 09th, 2016

Proceedings

Volume 1

Czech Society for Non-destructive Testing

in cooperation with

Brno University of Technology

Edited by: Pavel MAZAL and Lubos PAZDERA

Copyright © 2016 Czech Society for NDT

All Rights Reserved

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II 32nd EWGAE

Scientific Committee / Reviewers

Ireneusz Baran Poland chairman

Zdenek Prevorovsky Czech Rep. co-chairman

Dimitrios Aggelis Greece Masayasu Ohtsu Japan

Anastasopoulos Athanasios Greece Kanji Ono USA

Petr Benes Czech Rep. Alain Proust France

Jürgen Bohse Germany Edoardo Proverbio Italy

Andreas Brunner Switzerland Rhys Pullin UK

Milan Chlada Czech Rep. Franz Rauscher Austria

Crescenzo Di Fratta Italy Bob Reuben UK

Sergey Elizarov Russia Markus Sause Germany

Antolino Gallego Spain Thomas Schumacher USA

Christian Grosse Germany Tomoki Shiotani Japan

Janez Grum Slovenia Thomas Thenikl Germany

Marvin Hamstad USA Pete Theobald UK

Catherine Herve France Peter Tscheliesnig Austria

Karen Holford UK Hartmut Vallen Germany

Lackner Gerald Austria Shuichi Wakayama Japan

Jean-Claude Lenain France Martine Wevers Belgium

Gerd Manthei Germany Yoshida Kenichi Japan

Marek Nowak Poland

Papers are reviewed by members of Scientific Committee

Local Organising Committee:

• Pavel Mazal chairman • Vaclav Svoboda co-chairman • Luboš Pazdera proceedings • Pavel Turek exhibition • Eva Svobodova member • Vendula Kratochvílová member • Daniela Turkova accommodation

Published by: Czech Society for Non-destructive Testing

in cooperation with Brno University of Technology

ISBN 978-80-214-5386-9 (printed version)

32nd EWGAE III

FOREWORD

This publication contains the papers presented at the 32nd European Conference on

Acoustic Emission Testing held in Prague, Czech Republic on September 7th - 9th

2016. This conference was organized by the European Working Group on Acoustic

Emission in cooperation with the Czech Society for Non-destructive Testing.

The primary objective of the 32nd European Conference on Acoustic Emission

Testing was exchange of information on research and industrial applications of

science and technology of Acoustic Emission (AE). The conference brought together

the expertise of scientists and engineers in academia and industry and covered

activities relevant to effective monitoring of infrastructures and technical systems.

European Working Group on Acoustic Emission (EWGAE) was founded in 1972

by a group of researchers and experts. The primary objective of the EWGAE is

exchange of information on acoustic emission method with particular emphasis on

scientific and technical development. Secondary objectives are a) Promoting the use

of standardised terminology in acoustic emission documentation, b) Providing

information about acoustic emission instrumentation, c) Providing information about

acoustic emission to interested parties outside the Group, and liaising with other

Groups having common interests and d) Development of common standards for

acoustic emission practice (see EWGAE Constitution - www.ewgae.eu/).

Czech Society for Non-destructive Testing (CNDT) is a non-profit public

organization whose main objective is to promote research, development, practical

use and other activities in the field of NDT/NDE of materials and structures in all

industrial areas. Through its diversified activity, the Czech NDT Society seeks to

assure quality and proficiency in the field of NDT/NDE. The contemporary Czech

Society for Non-destructive Testing (founded in 1993) continues a long-time tradition

of the antecedent Czechoslovak NDT Society, established already sixty years ago.

Traditionally, CNDT organizes every year the international “NDE for

Safety/Defektoskopie” conferences, accompanied by tradeshows and workshops.

The society organizes specialized international NDT events, e.g. traditional workshop

“NDT in PROGRESS”. Czech Society for NDT was the main organizer of the

successful 11th European Conference on NDT 2014 in Prague and 25th EWGAE

conference in 2002. More info: www.cndt.cz.

Proceedings are also published in digital form and papers are also presented at

www.NDT.net.

IV 32nd EWGAE

32nd EWGAE V

CONTENTS

Contributions can be found in alphabetical order according to the surname of the first author.

ALLEVATO Claudio AET MONITORING OF DAMAGED OR CRACKED CRITICALE QUIPMENT

UNTIL REPAIRS OR REPLACEMENT IS POSSIBLE

1

AUGUTIS Stasys V., MURAVIN Boris, VAŠTAKAS Edgaras APPLICATION OF WAVEGUIDES FOR THE CALIBRATION OF ACOUSTIC

EMISSION TRANSDUCERS

7

BARAN Ireneusz, LYASOTA Igor, SKROK Krzysztof ACOUSTIC EMISSION TESTING OF UNDERGROUND PIPELINES OF

CRUDE OIL OF FUEL STORAGE DEPOTS

15

BASHKOV Oleg, POPKOVA Alexandra, SHARKEEV Yurii, BASHKOVA Tatiana ACOUSTIC EMISSION DURING FATIGUE DAMAGE OF

NANOSTRUCTURED TITANIUM

27

BIRCK Gabriel, ITURRIOZ Ignacio A VERSION OF THE DISCRETE ELEMENT METHOD IN THE SIMULATION

OF THE ACOUSTIC EMISSION TESTING

35

BONIFACE Antoine, SBARTAÏ Zoubir M., SALIBA Jacqueline, RANAIVOMANANA Nary

COMPARISON OF LOCALIZATION STRATEGIES OF DAMAGE IN

CONCRETE BY ACOUSTIC EMISSION

45

BRUNNER Andreas J. CORRELATION BETWEEN ACOUSTIC EMISSION SIGNALS AND

DELAMINATIONS IN CARBON FIBER-REINFORCED POLYMER-MATRIX

COMPOSITES: A NEW LOOK AT MODE I FRACTURE TEST DATA

55

CALABRESE Luigi, GALEANO Massimiliano, PROVERBIO Edoardo, DI PIETRO Domenico, DONATO Angelo, CAPPUCCINI Filippo

ADVANCED SIGNAL ANALYSIS APPLIED TO DISCRIMINATE DIFFERENT

CORROSION FORMS BY ACOUSTIC EMISSION DATA

65

CALABRESE Luigi, GALEANO Massimiliano, PROVERBIO Edoardo, DI PIETRO Domenico, DONATO Angelo

MONITORING OF HYDROGEN ASSISTED SCC ON MARTENSITIC

STAINLESS STEEL BY ACOUSTIC EMISSION TECHNIQUE

75

CRESPO Saúl, CARRIÓN Francisco, QUINTANA Juan, SEPÚLVEDA Francisco, HERNÁNDEZ Jorge, GASCA Héctor

AE DEFECT EVALUATION OF THE UPPER ANCHORAGE ELEMENTS OF

A STAYED BRIDGE

85

DROUBI Mohamad G., FAISAL Nadimul H., STUART Alan, MOWAT John, NOBEL Craig, EL-SHAIB Mohamed N.

ACOUSTIC EMISSION TESTING OF COMPOSITE-TO-METAL AND METAL-

TO-METAL ADHESIVE BOND STRENGTHS

95

VI 32nd EWGAE

DUBOV A. A., SEMASHKO N. A., PRIVALOV V. Yu., KOLOKOLNIKOV S. M.

RESULTS OF STEEL 20 SPECIMENS TENSILE TESTING USING THE METAL

MAGNETIC MEMORY AND ACOUSTIC EMISSION METHODS

105

ELIZAROV Sergey, ALYAKRITSKY Alexander, TROFIMOV Pavel,

BUGANKOV Alexey

THE NEW HARDWARE FEATURES OF A-LINE 32D AE SYSTEMS

109

ELIZAROV Sergey, BARAT Vera, BARDAKOV Vladimir, CHERNOV Dmitry,

TERENTYEV Denis

FEATURES OF THE AE TESTING OF EQUIPMENT ON OPERATING MODE

115

EL-SHAIB Mohamed, KESHK Omar, SHEHEDA Mohamed

MONITORING OF DEEP GROOVE BALL BEARING DEFECTS USING THE

ACOUSTIC EMISSION TECHNOLOGY

125

EL-SHAIB Mohamed, RIAD Omar, SHEHEDA Mohamed

SEEDED FAULT DETECTION ON SPUR GEARS WITH ACOUSTIC

EMISSION

137

ENOKI Manabu, MUTO Yuki, SHIRAIWA Takayuki

EVALUATION OF DEFORMATION BEHAVIOR IN LPSOMAGNESIUM

ALLOYS BY AE CLUSTERING AND INVERSE ANALYSIS

145

FALLAHI N., NARDONI G., PALAZZETTI R., ZUCCHELLI A.

PATTERN RECOGNITION OF ACOUSTIC EMISSION SIGNAL DURING THE

MODE I FRACTURE MECHANISMS IN CARBON-EPOXY COMPOSITE

151

GADE Sebastian O., POTSTADA Philipp, ALACA Benjamin B., SAUSE Markus G. R.

MEASUREMENT OF ELECTROMAGNETIC EMISSION AS A TOOL TO

STUDY FRACTURE PROCESSES OF CARBON FIBRE REINFORCED

POLYMERS

163

GUENTHER Thomas, KROLL Andreas

LOCALIZATION OF COMPRESSED AIR LEAKS IN INDUSTRIAL

ENVIRONMENTS USING SERVICE ROBOTS WITH ULTRASONIC

MICROPHONES

173

HAMSTAD Marvin A.

MODELED TRANSVERSE SURFACE AE SIGNALS FROM BURIED DIPOLE

SOURCES IN A POLYMER ROD

183

HATA Yuto, MIZUTANI Yoshihiro, TODOROKI Akira, SUZUKI Yoshiro

DEVELOPMENT OF A METHOD FOR CLASSIFYING CFRP FRACTURE

MODES BY AE TESTING

193

CHERNOV Dmitry, ELIZAROV Sergey, BARAT Vera, VASILYEV Igor

FEATURES OF THE AE TESTING OF EQUIPMENT ON OPERATING MODE

201

CHLADA Milan, NOHAL Libor, PREVOROVSKY Zdenek

CONDITION MONITORING OF THRUST BALL BEARINGS USING

CONTINUOUS AE

211

ITO Kaita, ENOKI Manabu

HIGH SENSITIVITY DETECTION OF AE EVENTS IN NOISY ENVIRONMENT

USING STREAM RECORDING AND PARALLEL COMPUTATION

217

32nd EWGAE VII

JIANG Yu, YANG Zhong, XU Feiyun, XU Bingsheng, GALLEGO Antolino DAMAGE VISUALIZATION AND LOCATION IN METAL STRUCTURE FOR

CRANE BY ACOUSTIC EMISSION TOMOGRAPHY

223

JUNG Doyun, MIZUTANI Yoshihiro, TDOROKI Akira, SUZUKI Yoshiro CHANGE IN B-VALUE BY AE PROPAGATION LENGTH IN CFRP

231

JÜNGERT Anne, DUGAN Sandra, UDOH Annett ACOUSTIC EMISSION TESTING UNDER DIFFICULT CONDITIONS

239

KAMYSHEV Arkady, RAZUVAEV Igor, SUCHKOV Eugeny INVESTIGATIONS OF THE AE SIGNAL PROPAGATION IN THE VESSELS

AND TANKS IN-OPERATION

247

KOBAYASHI Yoshikazu, SHIOTANI Tomoki TWO-DIMENSIONAL Q-VALUE AE-TOMOGRAPHY AND ITS VERIFICATION

ON NUMERICAL INVESITIGATIONS

253

KRATOCHVILOVA Vendula, VLASIC Frantisek, MAZAL Pavel STUDY OF FATIGUE PROCESSES OF SELECTIVE LASER MELTING AND

CONVENTIONAL PRODUCED MATERIALS

263

LACKNER Gerald, TSCHELIESNIG Peter ACOUSTIC EMISSION TESTING ON LPG TANKS – DEFECT DETECTION

CASE STUDIES

271

LIU Zhidong, LIAO Hongqiang, LIU Yuan THE TIME SEQUENCE CHARACTERISTICS AND LOCATION METHOD OF

AE SOURCE INDUCED BY DEBRIS CLOUD

279

LIVITSANOS G., SHETTY N., VERSTRYNGE E., WEVERS M., Van HEMELRIJCK D., AGGELIS D. G.

CHARACTERIZATION OF FRACTURE MODE IN MASONRY BY ACOUSTIC

EMISSION

287

LOKAJÍČEK Tomáš, PŘIKRYL Richard, ŠACHLOVÁ Šárka, KUCHAŘOVÁ Aneta

ALKALI SILICA REACTIVITY STUDY OF ACCELERATED MORTAR BAR

BY MEANS OF ACOUSTIC EMISSION AND ULTRASONIC SOUNDING

297

LUO Sha, DIAMBRA Andrea, IBRAIM Erdin APPLICATION OF ACOUSTIC EMISSION ON CRUSHING MONITORING

OF INDIVIDUAL SOIL PARTICLES IN UNIAXIAL COMPRESSION TEST

305

MAHMOUD Houssam, VLASIC Frantisek, MAZAL Pavel, JANA Miroslav DAMAGE IDENTIFICATION OF PNEUMATIC COMPONENTS BY

ACOUSTIC EMISSION

315

MAZAL Pavel, MAHMOUD Houssam, DOSTAL Petr, CERNY Michal, SUSTR Michal, ZACAL Jaroslav

COOPERATION OF MENDEL UNIVERSITY AND BRNO UNIVERSITY

OF TECHNOLOGY IN THE FIELD OF BIOLOGICAL APPLICATIONS OF

AE METHOD

323

MIZUTANI Yoshihiro, MIKI Takehiro, TODOROKI Akira, SUZUKI Yoshiro MANUAL LAMB WAVE TOMOGRAPHY UTILIZING AE TECHNIQUE

333

VIII 32nd EWGAE

MURAVIN Boris, GOTTESMAN Tamara

ACOUSTIC EMISSION COMPARATIVE STUDY OF CARBON/EPOXY

COMPOSITES UNDER LOAD

343

NISHIDA Takahiro, SHIOTANI Tomoki, ASAUE Hisafumi, SAGRADYAN Artur

EVALUATION OF INTERNAL DEFECTS OF REINFORCED CONCRETE

COLUMNS BY MEANS OF AE TOMOGRAPHY

353

NOWAK Marek, LYASOTA Igor, BARAN Ireneusz

THE TEST OF RAILWAY STEEL BRIDGE WITH DEFECTS USING ACOUSTIC

EMISSION METHOD

363

OGURA Norihiko, YATSUMOTO Hitoshi, SHIOTANI Tomoki

INTERNAL CONCRETE INSPECTION AND EVALUATION METHODS FOR

STEEL PLATE-BONDED SLABS BY USING ELASTIC WAVES VIA ANCHOR

BOLTS

373

ONGPENG Jason Maximino C., ORETA Andres Winston C., HIROSE Sohichi

MONITORING DAMAGE IN REINFORCED CONCRETE STRUCTURE USING

SEESAW EFFECT THROUGH ACOUSTIC EMISSION TEST

383

PANEK Maciej, NOWAK Marek, BARAN Ireneusz, KONSZTOWICZ Krzysztof J.

ACOUSTIC EMISSION DETECTION OF DAMAGE INITIATION IN 1D CFRP

NCF COMPOSITES SUBJECTED TO BENDING

393

PAZDERA Lubos, TOPOLAR Libor, SMUTNY Jaroslav, MIKULASEK Karel,

CIKRLE Petr

ACOUSTIC EMISSION METHOD IN CIVIL ENGINEERING APPLIED TO

MONITORING THERMAL LOADING CONCRETE SPECIMENS BY A THREE-

POINT BENDING TEST

403

PETRUŽÁLEK Matěj, LOKAJÍČEK Tomáš, SVITEK Tomáš

ACOUSTIC EMISSION AND ULTRASONIC SOUNDING AS A TOOL FOR

MIGMATITE FRACTURING

409

RAVNIK Franc, GRUM Janez

IDENTIFICATION OF MACHINE COMPONENTS CRACKING WITH SOUND

EMISSION DURING STEEL QUENCHING

419

SAGASTA Francisco, MIZUTANI Yoshihiro, VALVERDE Ignacio,

SUAREZ Elisabet, RESCALVO Francisco J., GALLEGO Antolino

INFLUENCE OF ATTENUATION ON THE ACOUSTIC EMISSION B-VALUE

FOR DAMAGE EVALUATION OF REINFORCED CONCRETE SPECIMENS

433

SAUSE Markus G. R.

ACOUSTIC EMISSION SOURCE IDENTIFICATION IN LARGE SCALE FIBRE

REINFORCED COMPOSITES

441

SERRIS Eric, CAMEIRAO Ana, GRUY Frédéric

MONITORING INDUSTRIAL CRYSTALLIZATION USING ACOUSTIC

EMISSION

451

SHIOTANI Tomoki, NISHIDA Takahiro, ASAUE Hisafumi, MAESHIMA Takuya

QUANTIFICATION OF FATIGUE DAMAGE EVALUATION IN RC SLABS

DURING WHEEL LOADING TEST BY MEANS OF 3D AE TOMOGRAPHY

461

Václav, ŽEMLIČKA František

32nd EWGAE IX

343

AN Artur 353

363

373

chi 383

sztof J. 393

rel, 403

PETRUŽÁLEKMatěj LOKAJÍČEK 409

419

433

441

451

Takuya 461

SVOBODA Václav, ŽEMLIČKA František

CONTINUOUS MONITORING OF STORAGE TANK BY ACOUSTIC

EMISSION METHOD

471

ŠOFER Michal, CRHA Jan, ZENGERLE Hannah

FROM NEAR FIELD TO FAR FIELD AND BEYOND

475

TARASENKO Alexander, BOHAC Petr, JASTRABIK Lubomir

SURFACE ACOUSTIC WAVES IN THE LAYERED SYSTEMS

485

THENIKL Thomas, ALTMANN Daniel, VALLEN Hartmut

QUANTIFYING LOCATION ERRORS

495

TSCHELIESNIG Peter, JAGENBREIN Andreas, LACKNER Gerald

DETECTING CORROSION DURING INSPECTION AND MAINTENANCE

OF INDUSTRIAL STRUCTURES USING ACOUSTIC EMISSION

503

VALLEN Hartmut, THENIKL Thomas, TRATTNIG Horst

EN13477-2 VERIFICATION OF AE INSTRUMENTATION - STATUS AND

PROPOSALS FOR IMPROVEMENT

511

VALLEN Hartmut, THENIKL Thomas, TRATTNIG Horst

OBTAINING WAVE-PATH INFORMATION FROM PULSED SENSOR PAIRS

517

WILLEMS Fabian, BENZ Johannes, BONTEN Christian

DETECTING THE CRITICAL STRAIN OF FIBER REINFORCED PLASTICS

BY MEANS OF ACOUSTIC EMISSION ANALYSIS

525

YOSHIDA Kenichi, KINOUCHI Hiroyuki, YASUDA Takeshi

EXAMINATION OF DYNAMIC BEHAVIOR DUE TO AE METHOD OF

MARTENSITIC TRANSFORMATION DURING BENDING DEFORMATION IN

CU-AL-NI SHAPE MEMORY ALLOY SINGLE CRYSTAL

535

YU Fengming, OKABE Yoji¸ WU Qi, SHIGETA Naoki

DAMAGE TYPE IDENTIFICATION BASED ON ACOUSTIC EMISSION

DETECTION USING A FIBER-OPTIC SENSOR IN CARBON FIBER

REINFORCED PLASTIC LAMINATES

543

X 32nd EWGAE

INDEX OF AUTHORS

AGGELIS D. G. 287 ALACA Benjamin B. 163 ALLEVATO Claudio 1 ALTMANN Daniel 495 ALYAKRITSKY Alexander 109 ASAUE Hisafumi 353, 461 AUGUTIS Stasys V. 7 BARAN Ireneusz 15, 363, 393 BARAT Vera 115, 201 BARDAKOV Vladimir 115 BASHKOV Oleg 27 BASHKOVA Tatiana 27 BENZ Johannes 525 BIRCK Gabriel 35 BOHAC Petr 485 BONIFACE Antoine 45 BONTEN Christian 525 BRUNNER Andreas J. 55 BUGANKOV Alexey 109 CALABRESE Luigi 65, 75 CAMEIRAO Ana 451 CAPPUCCINI Filippo 65 CARRIÓN Francisco 85 CERNY Michal 323 CIKRLE Petr 403 CRESPO Saúl 85 CRHA Jan 475 DI PIETRO Domenico 65, 75 DIAMBRA Andrea 305 DONATO Angelo 65, 75 DOSTAL Petr 323 DROUBI Mohamad G. 95 DUBOV A. A. 105 DUGAN Sandra 239 ELIZAROV Sergey 109, 115, 201 EL-SHAIB Mohamed N. 95, 125, 137 ENOKI Manabu 145, 217 FAISAL Nadimul H. 95 FALLAHI N. 151 GADE Sebastian O. 163 GALEANO Massimiliano 65, 75 GALLEGO Antolino 223, 433 GASCA Héctor 85 GOTTESMAN Tamara 343 GRUM Janez 419

GRUY Frédéric 451 GUENTHER Thomas 173 HAMSTAD Marvin A. 183 HATA Yuto 193 HERNÁNDEZ Jorge 85 HIROSE Sohichi 383 CHERNOV Dmitry 115, 201 CHLADA Milan 211 IBRAIM Erdin 305 ITO Kaita 217 ITURRIOZ Ignacio 35 JAGENBREIN Andreas 503 JANA Miroslav 315 JASTRABIK Lubomir 485 JIANG Yu 223 JUNG Doyun 231 JÜNGERT Anne 239 KAMYSHEV Arkady 247 KESHK Omar 125 KINOUCHI Hiroyuki 535 KOBAYASHI Yoshikazu 253 KOLOKOLNIKOV S. M. 105 KONSZTOWICZ Krzysztof J. 393 KRATOCHVILOVA Vendula 263 KROLL Andreas 173 KUCHAŘOVÁ Aneta 297 LACKNER Gerald 271, 503 LIAO Hongqiang 279 LIU Yuan 279 LIU Zhidong 279 LIVITSANOS G. 287 LOKAJÍČEK Tomáš 297, 409 LUO Sha 305 LYASOTA Igor 15, 363 MAESHIMA Takuya 461 MAHMOUD Houssam 315, 323 MAZAL Pavel 263, 315, 323 MIKI Takehiro 333 MIKULASEK Karel 403 MIZUTANI Yoshihiro 193, 231, 333,

433 MOWAT John 95 MURAVIN Boris 7, 343 MUTO Yuki 145 NARDONI G. 151

32nd EWGAE XI

NISHIDA Takahiro 353, 461 NOBEL Craig 95 NOHAL Libor 211 NOWAK Marek 363, 393 OGURA Norihiko 373 OKABE Yoji 543 ONGPENG Jason Maximino C. 383 ORETA Andres Winston C. 383 PALAZZETTI R. 151 PANEK Maciej 393 PAZDERA Lubos 403 PETRUŽÁLEK Matěj 409 POPKOVA Alexandra 27 POTSTADA Philipp 163 PREVOROVSKY Zdenek 211 PRIVALOV V. Yu. 105 PROVERBIO Edoardo 65, 75 PŘIKRYL Richard 297 QUINTANA Juan 85 RANAIVOMANANA Nary 45 RAVNIK Franc 419 RAZUVAEV Igor 247 RESCALVO Francisco J. 433 RIAD Omar 137 SAGASTA Francisco 433 SAGRADYAN Artur 353 SALIBA Jacqueline 45 SAUSE Markus G. R. 163, 441 SBARTAÏ Zoubir M. 45 SEMASHKO N. A. 105 SEPÚLVEDA Francisco 85 SERRIS Eric 451 SHARKEEV Yurii 27 SHEHEDA Mohamed 125, 137 SHETTY N. 287 SHIGETA Naoki 543 SHIOTANI Tomoki 253, 353, 373,

461 SHIRAIWA Takayuki 145 SKROK Krzysztof 15 SMUTNY Jaroslav 403

STUART Alan 95 SUAREZ Elisabet 433 SUCHKOV Eugeny 247 SUSTR Michal 323 SUZUKI Yoshiro 193, 231, 333 SVITEK Tomáš 409 SVOBODA Václav 471 ŠACHLOVÁ Šárka 297 ŠOFER Michal 475 TARASENKO Alexander 485 TDOROKI Akira 231 TERENTYEV Denis 115 THENIKL Thomas 495, 511, 517 TODOROKI Akira 193, 333 TOPOLAR Libor 403 TRATTNIG Horst 511, 517 TROFIMOV Pavel 109 TSCHELIESNIG Peter 271, 503 UDOH Annett 239 VALLEN Hartmut 495, 511, 517 VALVERDE Ignacio 433 Van HEMELRIJCK D. 287 VASILYEV Igor 201 VAŠTAKAS Edgaras 7 VERSTRYNGE E. 287 VLASIC Frantisek 263, 315 WEVERS M. 287 WILLEMS Fabian 904 WU Qi 543 XU Bingsheng 223 XU Feiyun 223 YANG Zhong 223 YASUDA Takeshi 535 YATSUMOTO Hitoshi 373 YOSHIDA Kenichi 535 YU Fengming 543 ZACAL Jaroslav 323 ZENGERLE Hannah 475 ZUCCHELLI A. 151 ŽEMLIČKA František 471

XII 32nd EWGAE

32nd EWGAE XIII

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XIV 32nd EWGAE

32nd EWGAE XV

PAPERS

XVI 32nd EWGAE

NOTES