February, Issue 02

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1 February, 2010

A MONTHLY HOUSE BULLETIN OF DEFENCE RESEARCH & DEVELOPMENT ORGANISATION

February 2010

Vol. 30 No. 2

Naval Materials Research Laboratory (NMRL) Ambernath, in association with Naval Research Board, has organised an International Symposium and Exhibition on ‘Fuel Cell Technologies:FUCETECH 2009’ at Nehru Centre, Worli, Mumbai, during 11 -13 November 2009.

Dr J Narayana Das, CC R&D(NS& HR), DRDO HQrs and Chairman, FUCE-TECH 2009 delivered the welcome address to the dignitaries, dele-gates and participants. The Symposium was inaugurated by Dr K Kasturirangan, Mem-ber Planning Commis-sion and presided over by Dr VK Saraswat, Scientific Adviser to Raksha Mantri, Secretary, Defence R&D and Director General, DRDO.

DRDO Takes a look at Global Fuel Cell Technologies FUCETECH-2009

Recent DRDO DevelopmentsFOX-7 Pilot Plant Anti-thermal Anti-laser Smoke Grenade

Manpower Development ActivitiesCourses, Workshops, Symposia, Awards

Visits

in this issue

FUCETECH 2009

DRDO Takes a Look at Global Fuel Cell Technologies

Dr K Kasturirangan lighting the lamp

Dr VK Saraswat, SA to RM delivering the presidential address

DRDO Newsletter

2February, 2010

DRDO Newsletter

Dr Saraswat, in his presidential address, stated that DRDO’s programme on fuel cell is aimed at comprehensive development of indigenous technologies for major defence-oriented projects. He elaborated that NMRL has done commendable work in developing the phosphoric acid fuel cell technologies, power conditioning systems, hydrogen generation systems. He also mentioned that NMRL has evolved a strong laboratory-industry partnership base across the country in past 3-4 years. The pioneering efforts made by the laboratory will help India to achieve clean power technologies that have low impact on environment. SA to RM felt the requirement of formation of a Fuel Cell Society that will undertake focused research on fuel cell development and promoting them by involving multiple agencies like academia, laboratories and industries.

Dr K Kasturirangan, in the inaugural address, expressed his happiness about the assemblage of eminent Scientists, Professors and Researchers from premier orgnisations in India and abroad for this important and very timely event at the International Symposium on Fuel Cell Technologies. He congratulated the organiser Naval Material Research Laboratory and sponsors, Naval Research

Board and International Association for Hydrogen Energy for the noble quest for clean and efficient alternate source of electrical power, the fuel cells. Dr Kasturirangan stated that organising such Symposium and exhibition is timely in the sense that the issue of climate change has emerged as the central theme of development globally. He further emphasised that the increasing demand of electrical power need to be met, despite critical technological challenges, from multi-energy systems and sources with efficiency as the

critical tool, and certainly, the renewable energy sources such as Solar photovoltaic, biomass, wind, hydrogen and Fuel Cells, being environmentally benign, will have to play part in a very significant manner.

The other prominent dignitaries who graced the dias in the Inaugural Session were Prof P Ramachandra Rao (Chairman, Naval Research Board), Dr R Krishnan (former CC R&D DRDO HQrs), Vice Admiral DSP Varma, PVSM, AVSM, VSM, DG Special Projects, DRDO and Vice Admiral Ganesh Mahadevan, AVSM, VSM, Chief of Materials (HQrs, MOD, Navy). The inaugural ceremony concluded with vote of thanks by Dr TK Chongdar. More than 425 delegates from 145 institutions and industries from India and abroad attended the event comprising 24 sessions in three halls, ran in parallel. 115 technical papers were presented including 15 poster papers. The topics covered comprised Hydrogen energy and technologies, Fuel cell modelling and designing, Solid oxide fuel cells, Proton exchange membrane fuel cells, Phosphoric acid fuel cells, Power conditioning systems, Direct alcohol fuel cells, Microbial fuel cells, Alternative fuel cells, Fuel cell components, and Fuel cell applications.

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TECH

2009

Dr K Kasturirangan delivering the inaugural address


3 February, 2010

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Fox-7 Pilot Plant

High Energy Materials Research Laboratory (HEMRL), Pune has developed FOX -7 Pilot Plant. FOX-7 Pilot Plant is the only facility for the preparation of 1,1- diamino-2,2-dinitroethene FOX-7 in India which is capable to meet the inhouse requirement of FOX-7 for various applications trials. FOX-7, a insensitive high explosive (IHE) material has gained significant importance due to its better stability to shock, friction, heat, etc. and higher performance compared with cyclotrimethylenetrinitramine (RDX). Due to good thermal and chemical stability of FOX-7, it is envisaged as futuristic IHE and potential candidate to replace RDX. Major applications of FOX-7 include: IHE warheads, rocket and gun propellant formulations, insensitive munitions booster, etc. It is compatible with plasticisers, polymers, and isocyanates commonly used for explosive formulations. It is quite insoluble in common

solvents like acetone, ethanol, cyclohexane, etc. unlike RDX, which also indicates its chemical inertness.

HEMRL, Pune has also developed Anti-thermal, Anti-laser smoke grenade. Anti-thermal, Anti-laser smoke grenade is effective against second-and-third-generation laser finders, laser target designators, laser beam riding

missiles, passive night vision

devices, and thermal imagers operating in 8 -14 µm range. It is electrically fired from the launchers fitted on the tank. The infrared screening smoke is produced at a distance giving visual as well as IR screening effects, particularly at the long wavelengths on which IR detectors operate. An 81 mm caliber anti-thermal; anti-laser smoke grenade based on red phosphorus has been developed by HEMRL to obscure visibility in the visible and IR regions and defeat laser range finders. The smoke grenade is of world standard. The grenade is mounted on either side of the turret of tank and electrically actuated from the MBT grenade launcher. The grenade forms a white dense smoke screen on bursting above the ground, which is capable of providing obscuration in the visible and IR ranges, for more than 20 s. The smoke screen is capable of defeating the thermal imagers and Nd-YAG laser range finders.

RECENT DRDO DEVELOPMENTS

Reactor Control Room Hydrolyser Filtration Acid storage Acid

81 mm Anti-thermal, Anti-laser Smoke Grenade

DRDO Newsletter

4February, 2010

POPULAR SCiENCE ARTiCLE

IPv6 Low Power Wireless Personal Area Networks (6LoWPAN) is a protocol defining flow of Internet Protocol Version 6 (IPv6) packets over a resource-constrained, low-power and short-range wireless network. Low-power wireless personal area networks are based on IEEE 802.15.4 standard. 6LoWPAN aims at extreme network scalability and providing IP-based connectivity even to the smallest of sensors and actuators that have a requirement to communicate amongst each other or with the external world over the Internet. Internet Engineering Task Force (IETF) established the 6LoWPAN Working Group in 2004 to use IPv6 in formulating a standard for LR-WPAN. The motive of this Group was to use IEEE 802.15.4 at the bottom layers and introduce IPv6 at the network layer of LR-WPAN. It relies on the compression of the IPv6 packets to make it suitable for battery, memory, and throughput- restrained network. IEEE 802.15.4 defines two types of nodes – Full Functional Device (FFD) and Reduced Functional Device (RFD). However, in case of LoWPAN, the nodes are distinguished as the LoWPAN Hosts, LoWPAN routers, and LoWPAN mesh nodes.

An IPv6 packet cannot fit in an IEEE 802.15.4 frame as the Maximum Transmission Unit (MTU) of IPv6 packet is 1280 bytes. IEEE 802.15.4 can support a maximum frame size of 127 bytes at physical layer. Thus, an intermediate adaptation layer is required

to support this. The primary functions of the adaptation layer are the TCP/IP header compression, handle packet fragmentation and reassembly, support routing in edge node, neighbour discovery and multi-cast support. The gateway architecture in IETF Internet Draft on 6LoWPAN routing supports i n t e r o p e r a b i l i t y between 6LoWPAN and the external IPv6 networks. Some other

major researches reported in the field of 6LoWPAN interoperability are between 6LoWPAN and NEMO, ZigBee, and IPv4.

There is an increasing market demand for the IEEE 802.15.4 chips. More than 7 million IEEE 802.15.4 chips were shipped in 2007 and this number is expected to rise to 100 million units in 2012 with an annual growth rate of 20-30 per cent. The 6LoWPAN has applications in the field of industrial automation, structural monitoring for strength and security, healthcare, wireless hospital monitoring, wireless patient care, convenient home, childcare, vehicular telematics, agricultural monitoring, real-time energy metering, situational awareness, smart soldier and weapon system, wearable PAN and precision asset tracking for defence or fire fighting and environmental monitoring and sensing. The applications running over 6LoWPAN should be ensured integrity, confidentiality, and authentication. The network should be free from malicious nodes and active as well as passive attacks like denial of service, spoofing, man-in-the middle attack. 6LoWPAN utilises the AES-based link layer security of IEEE 802.15.4. However the protocol does not specify any details about key management or security in higher layers.

(Contributed by Shri Sumit Goswami, Sc D, Dte of MIST, DRDO HQrs)

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5 February, 2010

MANPOWER DEVELOPMENT ACTiViTiESGTRE, Bangaluru

Gas Turbine Research Establishment (GTRE), Bangaluru, organised a five day Course on ‘Basic Automobile Engineering’ for Drivers, Technicians and Technical Assistants working in the field of Automobiles during 14 - 18 December 2009. The Course was attended by 30 participants from various DRDO labs / estts.

The major topics covered during the Course Introduction to Automobiles, Concepts of IC Engines, Fundamentals of Automatic Transmission, Basic concepts of Gas Turbines and their Application in Automobiles, Preventive Maintenance in Vehicles, Repairs and Overhaul of Vehicles, Fuel Injection System in Petrol Vehicles, Diesel Fuel Injection, Control Systems, Special Features of Two-stroke Engines, Vehicular Problems at High Altitudes and Possible Solutions, Art of Safe Driving, Safety Aspects in Handling Vehicles, Testing Procedure, etc.

Shri MS Sundar, Officiating Director inaugurated the Course and presided over the

Valedictory programme. Shri N Prabhakaran, Sc F was the Course Director.

iNMAS, Delhi

A course on `Chemical Biological, Radiological and Nuclear Disasters’ was organised by Institute of Nuclear Medicine & Allied Sciences (INMAS), Delhi, during 9-13 November 2009. Twenty four participants from various DRDO labs/estts attened the course. Brig. Anil Harnal, DDG PP NBC HQrs MoD (Army), delivered the keynote address giving an overview of CBRN Disasters.Faculty was drawn from DRDO, Armed Forces Medical Services, Ministry of Health & Family Welfare, FICCI and NOMA. Dr Rakesh Kumar Sharma, Sci F was the Course Director. Dr RP Tripathi, Director, INMAS delivered the valedictory address and distributed Certificates to the participants.

SAG, Delhi

The 10th International Conference on Cryptology – INDOCRYPT 2009 – was jointly organized by Scientific Analysis Group (SAG), DRDO and Delhi University under the aegis of

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A view of the inaugural session of the INDOCRYPT - 2009

DRDO Newsletter

6February, 2010

DRDO Newsletter

Cryptology Research Society of India (CRSI) during 13-16 December 2009 at the I N S A

Auditorium, New Delhi. Dr PK Saxena, OS & Director SAG was the General Chair whereas Prof Bimal Roy, ISI, Kolkata and Nicolas Sendrier, INRIA, France, were the Program Chair for the Conference.

The Conference was inaugurated by Dr R Sreehari Rao, OS & Chief Controller R&D (ECS), was attended by more than 250 persons including delegates, invited guests and guest speakers. More than 50 persons from abroad participated in the Conference.

More than 100 submissions were received from all over the world. Finally 28 research papers were selected based on very strict review process meeting the international standards. The first day of the Conference was dedicated to two tutorials which were delivered by two eminent crypto-researchers – Willi Meier and Nicolas Sendrier. In the next three days, three invited talks and 20 research papers were presented. The invited talks were delivered by Daniel Bernstein, Marc Girault and Thomas Johansson.

The proceedings of the conference were published by Springer under Lecture Notes in Computer Sciences which was distributed to delegates at the time of conference.

VRDE, AhmednagarVehicles Research and Development

Establishment (VRDE), Ahmednagar participated in XXI National Conference on IC Engines and Combustion (NCICEC)–2009 held at Bapuji Institute of Engineering & Technology, Davangere, Karnataka, during 10-12 December 2009 under the auspices of The Combustion Institute–Indian Section. Dr VK Saraswat, SA to RM inaugurated the Conference and technical exhibition.

The Conference provided a unique forum for engineers and scientists from academic institutions/Industries, both from within India and abroad to meet and exchange technical information on new developments in the field of IC Engines, Combustion and Propulsion. During this event, VRDE had set up a stall and

exhibited indigenously developed 55 Hp Wankle type rotary engine and variants of two-stroke engines for UAV application along with display system comprising VRDE products.

scientific meetings/conferences abroad

Dr TV Karthikeyan of Adavnced Systems Laboratory (ASL), Hyderabad was selected by the DST to be a part of 30 member delegation of Scientists from various disciplines to visit labs/institutions in Israel during 1-7 November 2009.

Shri JC Kapoor, Director CFEES, Vice Chainnan of Asia Fire-Protection Inspection Council (AFIC) was deputed for its 5th Annual Meeting, hosted by ‘Japan Fire Equipment Inspection Institute’, Japan during 01-04 December 2009. AFIC is a body of Fire

Protection Organisations of Asian countries for promotion of technical exchange and fostering of cooperation for development of Asian fire protection technologies and inspection.

Shri Bhaskar Burman, Addl Director of the Office of the Scientific Adviser to Chief of Naval Staff has been deputed to Kuala Lumpur, Malaysia during 28-30 September 2009 to attend the GIS Defence Asia Pacific Conference and also deliver Keynote Address at the Conference.

Dr R Sreehari Rao, OS & Chief Controller R&D (ECS) lighting the lamp


7 February, 2010


Defence Research & Development Organisation (DRDO) was adjudged awarded as the “Exhibitor of the Year “during 97th Indian Science Congress (Science & Technology Challenges of 21st Century-National Perspective) held at University of Kerala, Thiruvanthapuram, Kerala during 3-7 January 2010.

awards

Dr A Subhananda Rao, DS & Director, HEMRL and Shri B Bhattacharya, Associate Director, were conferred “Honorary Professorship of Rocket Motors Chair “ by Altai State Technical University, Russia. The Awards were presented on 09 December 2009 during HEMCE 2009 at Pune.

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Shri B Bhattacharya, Assoc. Director receiving Honorary Professorship of Rocket Motors Chair

Dr A Subhananda Rao, DS & Director, HEMRL receiving Honorary Professorship of Rocket Motors Chair

higher Qualification achievediNMAS

Shri R Kumar Swamy, SRF, Institute of Nuclear Medicine & Allied Sciences (INMAS) has been awarded the Gold Medal under the “Maniben Kirtilal Mehta Endowment” by the Bharathiar University at its 25th Convocation held on 24 November 2009 for his PhD thesis entitled ’Role of Mitochondria and Antiapoptotic Micro RNAs in Cell Death Regulation of Lepidopteran Insect Cells’. The thesis has been completed under the guidance of Dr Sudhir Chandna, Sc E, INMAS, Delhi.

DRDO Newsletter

8February, 2010

DRDO

DFRL, Mysore

Defence Food Research Laboratory (DFRL) celebrated 49th Lab Raising Day on 28 December 2009. Cultural programmes, community lunch and award distribution ceremony were organized on this occasion. Welfare Chairperson welcomed each all to the function. Prof VG Talwar, Vice Chancellor, University of Mysore was the Chief Guest of the function and Dr AS Bawa, OS & Director, DFRL

distributed various awards to the staff for their outstanding R&D contributions made during 2008.

These awards w e r e ` T e c h n o l o g y Group Award’ Dr (Mrs) PremavaIIi, Sc F & Team and Dr (Mrs) Farhath Khan, Sc E & Team, `Laboratory Scientist of the Year Award’ (Dr K Radhakrislma and Dr Joseph Kingston), `Laboratory Award for DRTC Cadre’ (Shri. MR Kumarswamy, TO-’C’ and Shri S Pandit Srihari, STA-’C’), `Laboratory award for Admin & AIIied Services’ (Shri V Srikantamurthy, PS’A’ and Smt S Sukanya,

PA’B’), `Best Research/ Review Paper Awards’, `DRDO Cash Awards’ (Non DRDS Staff), `All Rounder Award’, `Director Special Awards’, etc., Prizes were given to the winners of various sports events and also Incentive prizes were given to the children of DFRL Staff members, who have passed in PUC, and SSLC Exams during 2008-2009. Staff members who had completed 25 years of services were also felicitated.

iTR, Chandipore

Integrated Test Range (ITR), Chandipur, celebrated its 27th Raising Day on 6 December 2009 with gaiety and fervor. Shri Srikant Kumar Jena, Minister of State for Chemicals and Fertilizers, Government of India inaugurated the function as Chief Guest. Many local MPs of Balasore attended the function. The Chief Guest conveyed his greetings to the employees of ITR for their significant contribution towards testing and evaluation of flight

vehicles for the last two decades and achieving self-reliance. He also stressed upon involvement of ITR to live in harmony with nature and its surroundings.

Lab level Awards, Merit Scholarship to children of ITR employees, Awards for best articles of in-house magazine Casuarina, felicitation of employees completing 25 years of glorious service, prizes for sports and cultural events to the employees and their family members were some of the highlights of the celebrations.

Prof VG Talwar, Vice Chancellor, University of Mysore lighting the lamp

RAiSiNG DAy CELEBRATiONS


9 February, 2010

Shri SP Dash, Director, ITR, Dr SN Banerjee, Chairman, Raising Day and Shri GR Panda, Chairman, Works Committee also addressed the

gathering. A cultural programme was also organized on the occasion.

VRDE, Ahmednagar

Vehicles Research and Development Establishment (VRDE), Ahmednagar celebrated its 39th Annual Day on 03 December 2009. Shri B Rajagopalan, OS & Director VRDE, inaugurated the annual function in the morning, which was

followed by distribution of awards under DRDO Incentive Scheme. Sports and Hindi awards were also presented during the function. In-house Hindi magazine ‘Gatisheel’ was released on the occasion. Felicitation of VRDE employees children for their outstanding achievements in academics were also felicitated on the occasion of Annual Day.

Karnataka Rajyotsava – 2009 CelebrationDefence Avionics

Research Establishment, Bangaluru has celebrated the 53rd Karnataka Rajyotsava on 20 November 2009. Eminent literary luminaries Prof GS Siddalingaiah and Prof. KP Putturaya graced the occasion and delivered enlightening speeches.

Shri S Jena, Hon’ble Minister of State for Chemicals & Fertilizers addressing the ITR community

A view of the Karnataka Rajyotsava - 2009 Celebration

DRDO Newsletter

10February, 2010

Annual Subscription Details Indian ForeignIndividual Rs 450 $ 100 Institutions Rs 1000 $ 240

Subscriptions are payable in advance by bank draft drawn in favour of Director, DESIDOC by bank draft payable at any bank at Delhi.

Defence Science Journal is a bimonthly international peer-reviewed defence-related multidisciplinary research journal from India covering a wide spectrum of subjects, viz., aeronautics, applied physics, armaments, biomedical sciences, chemistry, computers, electronics, explosives, materials science, missile technology, naval science, etc. It reports theoretical, laboratory and field test results, and new techniques and application of the existing techniques in defence environment.Indexed/abstracted/full-text available at Cambridge Scientific Abstracts, Chemical Abstracts, Indian Science Abstracts, International Aerospace Abstracts, HW Wilson Co. full-text databases (Omnifile Full-text Mega, Omnifile Full-text Select, and NTIS database). DSJ

For further information, please contact:Director, Defence Scientific Information and Documentation Centre, Metcalfe House , Delhi-110 054, Indiae-mail: [email protected], [email protected]: http://publications.drdo.gov.in/ojs/index.php, Tele: 23902463-66

15% Discount is available for booksellers and vendors

announcement

Defence Research and Development OrganisationStudents Robotics Competition

Autonomous Ground Vehicle For Low Intensity Conflict

Problem Definition

Conduct of the Competition

To build an autonomous off road robotic platform which can navigate a rough terrain and avoid natural & man made obstacles in the shortest amount of time. The robot should complete a closed loop obstacle course of 500m consisting of various hurdles within an anticipated time of 20 min using Autonomous Navigation at a maximum speed of 10 KMPH with a maximum payload of 20 KG.

The competition will be conducted in two stages as under:

(a) Stage I (Preliminary Design): A design approach paper to be submitted by 31 Mar 2010 for the Stage1 evaluation, which will be evaluated from the point of view of approach to the problem, innovation, originality, technical feasibility etc. Ten best design solutions will be selected to take part in Stage2 of the competition.

(b) Stage II (Prototype): A suitable prototype based on the Stage1 approach paper, along with detailed design document will have to be submitted for design evaluation and demonstration trials on the day of the final competition.

Awards/ Prize Money (a) Stage 1: Ten prizes of Rs 1,00,000/- each. (Total Rs 10,00,000/-)(b) Stage 2: Prizes of Rs 2 Lakh, 1 Lakh and 75 Thousand will be awarded to the entries adjudged 1st,2nd and 3rd respectively.(c)Theme Prize: Prizes of Rs 25 Thousand each will be awarded for: Innovation, Kinematics, Multi-sensor data fusion, Algorithm & software and Fault tolerant architecture.

Time plan and schedule.(a) Last Date for submission of Stage I entries : 31 Mar 2010(b) Announcing of results of Stage I : 31 May 2010(c) Conduct of Final Competition : 27–29 Sep 2010

Details including the rules of the competition can be viewed at the DRDO Website : http://www.drdo.gov.in/The entry forms and formats for declarations can also be downloaded from the site.


11 February, 2010

SPORTS NEWS

DRDO North Zone Football Tournament

DRDO North Zone Football Tournament was organised by Defence Electronics Application Laboratory (DEAL), Dehradun during 4-6 November 2009. Football teams from DEAL; IRDE, Dehradun; DL, Jodhpur; DMSRDE, Kanpur; LASTEC, Delhi; DRDO HQrs; CFEES and DTRL, Delhi participated in the tournament. DEAL lifted the trophy by defeating LASTEC by 1 – 0 in the finals during ‘sudden death’ round.

CABS, Bangaluru

Centre for Airbome Systems (CABS) following officers have won medals in the South Zone Shuttle Badminton Tournament held at Bangaluru during 16 - 18 November 2009:

Ladies Singles (Silver Medal)Ms Priyanka Meena, Sc CLadies Doubles (Silver Medal) Ms B Divya, and Ms Priyanka Meena, Sc C

DRDO iNTRA ZONAL BASKET BALL TOURNAMENT 2009

Vehicles Research & Development Establishment (VRDE), Ahmednagar, organised the DRDO Intra Zonal (West Zone) Basket Ball Tournament 2009 during 15-17 December 2009. Teams from Pune region, i.e. ARDE, HEMRL, R&DE(E) and VRDE participated in the tournament. HEMRL emerged as the Winner while VRDE was the Runner-up. Dr SB Singh, Offg Director, VRDE

inaugurated the event and Shri B Rajagobalan, OS & Director VRDE gave away the Trophies and Medals, on culmination of the Tournament.

DRDO North Zone Volley Ball Tournament

Defence Electronics Application Laboratory (DEAL) lifted the Runner-up Trophy in DRDO North Zone Volley Ball Tournament organised by IRDE, Dehradun, during October 2009. DMSRDE, Kanpur was the Winner of the Tournament.

HEMRL, Pune and VRDE, Ahmednagar teams with Winner’s and Runner’s up trophies

Director DEAL with DEAL Football Team

DRDO Newsletter

12February, 2010

iSSN:0971-4391

ViSiTS TO DRDO LAB/ESTTS

Lt Gen SP Singh VSM DGIS, interacting with the senior scientists of CAIR

Lt Gen SP Singh VSM DGIS on 23 December 2009

Vice Admiral Shekhar Sinha, AVSM NM & Bar DCIDS (Ops) on 14 December 2009

CAiR, Bangaluru

Dr R Sreehari Rao, OS & CCR&D (ECS) on 18 December 2009

Dr R Sreehari Rao, OS & CCR&D (ECS) interacting with the scientists of CAIR

RCi, Hyderabad

Smt Rekha Gupta, Dy. CAG & Shri Gautam Guha, DG, Audit on 3 November 2009.

VRDE, Ahmednagar

Dr VK Saraswat, SA to RM and Dr R Chidambaram Principle SA to Govt of India on 10 December 2009

Dr VK Saraswat, SA to RM and Dr R Chidambaram Principle SA to Govt. of India being briefed by Dv Radahakrishna, Sc ‘F’ of

VRDE about UAV Engines

Editors are thankful to DRDO NEWSLETTER Correspondents for their inputs

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-110 054: 011-2390 2471; : 011-2381 9151

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Documents

February, Issue 02