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Observation of RXJ1713.7-3946 by CANGAROO telescope

Astronomische Nachrichten 2001年第4‐5期320卷

作者： H. Muraishi T. Tanimori S. Yanagita T. Yoshida T. Kifune S.A. Dazeley P.G. Edwards S. Gunji S. Hara T. Hara J. Jinbo A. Kawachi H. Kubo J. Kushida Y. Matsubara Y. Mizumoto M. Mori M. Moriya Y. Muraki T. Naito K. Nishijima J.R. Patterson M.D. Roberts G.P. Rowell T. Sako K. Sakurazawa Y. Sato R. Susukita T. Tamura T. Yoshikoshi A. Yuki Faculty of Science Ibaraki University Mito Ibaraki 310-8521 Japan Department of Physics Tokyo Institute of Technology Meguro Tokyo 152-8551 Japan Institute for Cosmic Ray Research University of Tokyo Tanashi Tokyo 188-8502 Japan Department of Physics and Mathematical Physics University of Adelaide South Australia 5005 Australia Institute of Space and Astronautical Science Sagamihara Kanagawa 229-8510 Japan Department of Physics Yamagata University Yamagata 990-8560 Japan Faculty of Management Information Yamanashi Gakuin University Kofu Yamanashi 400-8575 Japan Department of Physics Tokai University Hiratsuka Kanagawa 259-1292 Japan STE Laboratory Nagoya University Nagoya Aichi 464-860 Japan National Astronomical Observatory Tokyo 181-8588 Japan Computational Science Laboratory Institute of Physical and Chemical Research Wako Saitama 351-0198 Japan Faculty of Engineering Kanagawa University Yokohama Kanagawa 221-8686 Japan

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X-ray observation of the supernova remnant/pulsar association – SNR G11.2-0.3

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Astronomische Nachrichten 2001年第4‐5期320卷

作者： K. Torii H. Tsunemi T. Dotani K. Mitsuda N. Kawai K. Kinugasa Y. Saito S. Shibata Space Utilization Research Program (SURP) Tsukuba Space Center (TKSC) National Space Development Agency of Japan (NASDA) 2-1-1 Sengen Tsukuba Ibaraki 305-8505 Japan Department of Earth and Space Science Graduate School of Science Osaka University 1-1 Machikaneyama-cho Toyonaka Osaka 560-0043 Japan Institute of Space and Astronautical Science (ISAS) 3-1-1 Yoshinodai Sagamihara Kanagawa 229-8510 Japan Cosmic Radiation Laboratory Institute of Physical and Chemical Research (RIKEN) Wako Saitama 351-0198 Japan Gunma Astronomical Observatory 6860-86 Nakayama Takayama Agatsuma Gunma 377-0702 Japan Department of Physics Yamagata University 1-4-12 Koshirakawa-cho Yamagata 990-8560 Japan

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Experimental Evidence for Crossover to Mean-Field Tricritical Behavior in a Concentrated Salt Solution

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physical Review Letters 2000年第11期85卷 2336-2336页

作者： M. A. Anisimov J. Jacob A. Kumar V. A. Agayan J. V. Sengers Institute for Physical Science and Technology and Department of Chemical Engineering University of Maryland College Park Maryland 20742 Department of Physics Indian Institute of Science Bangalore 560012 India

We have discovered a mean-field multicritical point on the critical locus in an aqueous solution of 3-methylpyridine and sodium bromide. Light-scattering measurements indicate Ising-like asymptotic critical behavior at the lower salt concentrations. However, the temperature range of Ising critical behavior shrinks with increasing salt concentration and the critical behavior becomes mean-field-like at a concentration of about 17% mass fraction of NaBr. Emergence of a new characteristic length scale diverging at this point and a simultaneous pronounced increase in the background scattering suggests mean-field tricritical behavior associated with the formation of a microheterogeneous phase due to clustering of ions and molecules.

关键词： Phase separation

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Superconductor-Insulator Transition in a Two-Dimensional Array of Resistively Shunted Small Josephson Junctions

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physical Review Letters 2000年第9期85卷 1974-1974页

作者： Yamaguchi Takahide Ryuta Yagi Akinobu Kanda Youiti Ootuka Shun-ichi Kobayashi Institute of Physics University of Tsukuba 1-1-1 Tennodai Tsukuba 305-8571 Japan CREST Japan Science and Technology Corporation 4-1-8 Honcho Kawaguchi 332-0012 Japan The Institute of Physical and Chemical Research (RIKEN) 2-1 Hirosawa Wako 351-0198 Japan

We have fabricated two-dimensional (2D) small-Josephson-junction arrays of which each Al−AlOx−Al junction is shunted by a Cr resistor. The arrays with large junction resistance and large charging energy show a transition from insulating to superconducting behavior when the shunt resistance is lowered below a critical value, which is close to 2RQ ( RQ≡h/4e2=6.45kΩ). The measured phase diagram is consistent with theories of quantum-fluctuation-driven and dissipation-driven phase transitions in the 2D Josephson-junction array with Ohmic shunt resistors.

关键词： Josephson junction devices

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Polarized parton distribution functions in the nucleon

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physical Review D 2000年第3期62卷 034017-034017页

作者： Y. Goto N. Hayashi M. Hirai H. Horikawa S. Kumano M. Miyama T. Morii N. Saito T.-A. Shibata E. Taniguchi T. Yamanishi RIKEN BNL Research Center Brookhaven National Laboratory Upton NY 11973 Radiation Laboratory The Institute of Physical and Chemical Research (RIKEN) Wako Saitama 351-0198 Japan Department of Physics Saga University Saga 840-8502 Japan Faculty of Human Development Kobe University Kobe 657-8501 Japan Department of Physics Tokyo Institute of Technology Tokyo 152-8551 Japan Department of Management Science Fukui University of Technology Gakuen Fukui 910-8505 Japan

Polarized parton distribution functions are determined by using world data from the longitudinally polarized deep inelastic scattering experiments. A new parametrization of the parton distribution functions is adopted by taking into account the positivity and the counting rule. From the fit to the asymmetry data A1, the polarized distribution functions of u and d valence quarks, sea quarks, and gluons are obtained. The results indicate that the quark spin content is ΔΣ=0.20 and 0.05 in the leading order (LO) and the next-to-leading-order (NLO) MS¯ scheme, respectively. However, if the x dependence of the sea-quark distribution is fixed at small x by “perturbative QCD” and Regge theory, it becomes ΔΣ=0.24–0.28 in the NLO. The small-x behavior cannot be uniquely determined by the existing data, which indicates the importance of future experiments. From our analysis, we propose one set of LO distributions and two sets of NLO ones as the longitudinally polarized parton distribution functions.

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The CANGAROO-III project

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AIP Conference Proceedings 2000年第1期515卷 485-491页

作者： Masaki Mori S. A. Dazeley P. G. Edwards S. Gunji S. Hara T. Hara J. Jinbo A. Kawachi T. Kifune H. Kubo J. Kushida Y. Matsubara Y. Mizumoto M. Moriya H. Muraishi Y. Muraki T. Naito K. Nishijima J. R. Patterson M. D. Roberts G. P. Rowell T. Sako K. Sakurazawa Y. Sato R. Susukita T. Tamura T. Tanimori S. Yanagita T. Yoshida T. Yoshikoshi A. Yuki 1Institute for Cosmic Ray Research University of Tokyo Tanashi Tokyo 188-8502 Japan 2Department of Physics and Mathematical Physics University of Adelaide South Australia 5005 Australia 3Institute of Space and Astronautical Science Sagamihara Kanagawa 229-8510 Japan 4Department of Physics Yamagata University Yamagata 990-8560 Japan 5Department of Physics Tokyo Institute of Technology Meguro Tokyo 152-8551 Japan 6Faculty of Management Information Yamanashi Gakuin University Kofu Yamanashi 400-8575 Japan 7Department of Physics Tokai University Hiratsuka Kanagawa 259-1292 Japan 8STE Laboratory Nagoya University Nagoya Aichi 464-8602 Japan 9National Astronomical Observatory Tokyo 181-8588 Japan 10Faculty of Science Ibaraki University Mito Ibaraki 310-8521 Japan 11LPNHE Ecole Polytechnique. Palaiseau CEDEX 91128 France 12Computational Science Laboratory Institute of Physical and Chemical Research Wako Saitama 351-0198 Japan 13Faculty of Engineering Kanagawa University Yokohama Kanagawa 221-8686 Japan

The CANGAROO-III project, which consists of an array of four 10 m imaging Cherenkov telescopes, has just started being constructed in Woomera, South Australia, in a collaboration between Australia and Japan. The first stereoscopic observation of celestial high-energy gamma-rays in the 100 GeV region with two telescopes will start in 2002, and the four telescope array will be completed in 2004. The concept of the project and the expected performance are discussed.

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The SNR W28 at TeV energies

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AIP Conference Proceedings 2000年第1期515卷 187-191页

作者： G. P. Rowell T. Naito S. A. Dazeley P. G. Edwards S. Gunji T. Hara J. Holder A. Kawachi T. Kifune Y. Matsubara Y. Mizumoto M. Mori H. Muraishi Y. Muraki K. Nishijima S. Ogio J. R. Patterson M. D. Roberts T. Sako K. Sakurazawa R. Susukita T. Tamura T. Tanimori G. J. Thornton S. Yanagita T. Yoshida T. Yoshikoshi 1Institute for Cosmic Ray Research University of Tokyo Tokyo 188-8502 Japan 2Fac. of Management Information Yamanashi Gakuin University Yamanashi 400-8575 Japan 3Department of Physics and Math. Physics University of Adelaide 5005 Australia 4Institute of Space and Astronautical Science Kanagawa 229-8510 Japan 5Department of Physics Yamagata University Yamagata 990-8560 Japan 8Solar-Terrestrial Environment Lab. Nagoya University Aichi 464-8601 Japan 9National Astronomical Observatory of Japan Tokyo 181-8588 Japan 10Faculty of Science Ibaraki University Ibaraki 310-8512 Japan 7Department of Physics Tokai University Kanagawa 259-1292 Japan 6Department of Physics Tokyo Institute of Technology Tokyo 152-8551 Japan 11Institute of Physical and Chemical Research Saitama 351-0198 Japan 12Faculty of Engineering Kanagawa University Kanagawa 221-8686 Japan

The southern supernova remnant (SNR) W28 was observed in 1994 and 1995 by the CANGAROO 3.8m telescope in a search for multi-TeV gamma ray emission, using the Čerenkov imaging technique. We obtained upper limits for a variety of point-like and extended features within a ±1° region and briefly discuss these results, together with that of EGRET within the framework of a shock acceleration model of the W28 SNR.

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Initial performance of CANGAROO-II 7m telescope

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AIP Conference Proceedings 2000年第1期515卷 313-317页

作者： Hidetoshi Kubo S. A. Dazeley P. G. Edwards S. Gunji S. Hara T. Hara J. Jinbo A. Kawachi T. Kifune J. Kushida Y. Matsubara Y. Mizumoto M. Mori M. Moriya H. Muraishi Y. Muraki T. Naito K. Nishijima J. R. Patterson M. D. Roberts G. P. Rowell T. Sako K. Sakurazawa Y. Sato R. Susukita T. Tamura T. Tanimori S. Yanagita T. Yoshida T. Yoshikoshi A. Yuki 1Department of Physics Tokyo Institute of Technology Meguro Tokyo 152-8551 Japan 2Department of Physics and Mathematical Physics University of Adelaide South Australia 5005 Australia 3Institute of Space and Astronautical Science Sagamihara Kanagawa 229-8510 Japan 4Department of Physics Yamagata University Yamagata 990-8560 Japan 5Faculty of Management Information Yamanashi Gakuin University Kofu Yamanashi 400-8575 Japan 6Department of Physics Tokai University Hiratsuka Kanagawa 259-1292 Japan 7Institute for Cosmic Ray Research University of Tokyo Tanashi Tokyo 188-8502 Japan 8STE Laboratory Nagoya University Nagoya Aichi 464-860 Japan 9National Astronomical Observatory Tokyo 181-8588 Japan 10Faculty of Science Ibaraki University Mito Ibaraki 310-8521 Japan 11LPNHE Ecole Polytechnique. Palaiseau Cedex 91128 France 12Computational Science Laboratory Institute of Physical and Chemical Research Wako Saitama 351-0198 Japan 13Faculty of Engineering Kanagawa University Yokohama Kanagawa 221-8686 Japan

CANGAROO group constructed an imaging air Cherenkov telescope (CANGAROO-II) in March 1999 at Woomera, South Australia to observe celestial gamma-rays in hundreds GeV region. It has a 7m parabolic mirror consisting of 60 small plastic spherical mirrors, and the prime focus is equipped with a multi-pixel camera of 512 PMTs covering the field of view of 3 degrees. We report initial performance of the telescope.

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Abstract

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Journal of chemical sciences 2000年第3期112卷 339-438页

作者： M. M. Balakrishnarajan Eluvathingal D Jemmis Sayan Gupta Shyamalava Mazumdar Pulakesh Mukherjee Tim Machonkin Jennifer L Dubois Adam P Cole Britt Hedman Keith O Hodgson Edward I Solomon T. D. P. Stack Herbert W Roesky P. T. Manoharan Sujoy Baitalik Kamalaksha Nag Sabyasachi Sarkar Ram Seshadri Claudia Felser John F Nixon Kattesh V Katti Nagavarakishore Pillarsetty Hideo Kamei Upasana Bora Mihir K. Chaudhuri Sidhartha S. Dhar Dipak Kalita B. N. Anand A. Ramanan Prasun Roy T. Duraisamy Sanjeev Sharma P. Ayyappan B. D. Gupta V. Vijai Kanth Veena Singh Eringathodi Suresh Kamla Boopalan Raksh Vir Jasra Mohan Madhav Bhadbhade G. A. Naganagowda K. V. Ramanathan V. Gayathri N. M. Nanjegowda P. Sengupta S. Ghosh Manish Bhattacharjee Shamayita Sen Gupta Riya Datta C. V. Sastri D. Easwaramoorthy Athi Lakshmi L. Giribabu B. G. Maiya P. Rabindra Reddy M. Radhika K. Florence Nightingale R. Srinivasan R. Venkatesan T. M. Rajendiran P. Sambasiva Rao P. Bhavana P. Bhyrappa M. Ravikanth Sudha Kumaraswamy Praveen Kommana G. Padmaja K. C. Kumara Swamy B. Mondal S. Chakraborty G. K. Lahiri Manabendra Ray Lawrence Que Anubhav Saxena N. Sampriya A. S. Brar Ravi Shankar B. B. Sahoo G. Panday A. A. Wasthi S. M. S. Chauhan Parvesh Wadhwani Deb Kumar Bandyopadhyay Ratna Bandyopadhyay Sudeb Biswas Ramgopal Bhattacharyya Vishwas Johis Dilip Kotkar Vinit S. Pathak V. Swayambhunathan Prashant Kamat Amitava Das Pushpito K. Ghosh Rajeev Gupta Rabindranath Mukherjee M. G. Walawalkar Sushanta K. Pal Anu Krishnan A. G. Samuelson Puspendu K. Das G. Anantharaman Kanhayalal Baheti R. Murugavel Gunjan Garg Ashok K. Ganguli M. Suresh A. V. Prasadarao S. Neeraj Srinivasan Natarajan C. N. R. Rao P. V. Vanitha P. N. Santhosh G. Girish Kumar N. Munichandraiah T. V. V. Ramakrishna Anil J. Elias Ashwani Vij Kajal Krishna Rajak Sankar Prasad Rath Sujit Dutta P. K. Bhattacharya P. Natarajan P. Paul T. Dhanasekaran H. Prakash N. Mangayarkarasi P. S. Zacharias A. Srinivasan Simi K Pushpan V. G. Anand T. K. Chandrashekar Punam Tripathi Abhigyan Som Parimal K. Bhar School of Chemistry University of Hyderabad Hyderabad India Department of Chemical Sciences Tata Institute of Fundamental Research Mumbai India Department of Chemistry Stanford University Stanford USA Stanford Synchrotron Radiation Laboratory SLAC Stanford USA University of Gottingen Gottingen Germany RSIC Indian Institute of Technology Chennai India Department of Inorganic Chemistry Indian Association for the Cultivation of Science Jadavpur Calcutta India Department of Chemistry Indian Institute of Technology Kanpur India Institut für Anorganische Chemie und Analytische Chemie Johannes Gutenberg-Universität Mainz Germany Solid State and Structural Chemistry Unit Indian Institute of Science Bangalore India School of Chemistry Physics and Environmental Science University of Sussex Brighton England Radiopharmaceutical Sciences Institute Departments of Radiology University of Missouri Columbia USA Radiopharmaceutical Sciences Institute Departments of Research Reactor University of Missouri Columbia USA Radiopharmaceutical Sciences Institute Departments of Chemistry University of Missouri Columbia USA Department of Surgery Aichi-Gakuin University Hospital Nagoya Japan Department of Chemistry Indian Institute of Technology Guwahati India Department of Chemistry Panjab University Chandigarh India Department of Chemistry Indian Institute of Technology New Delhi India Silicates and Catalysis Division Central Salt and Marine Chemicals Research Institute Bhavnagar India Sophisticated Instruments Facility Indian Institute of Science Bangalore India Department of Chemistry Central College Campus Bangalore University Bangalore India Department of Inorganic Chemistry Indian Association for the Cultivation of Science Calcutta India Department of Chemistry Indian Institute of Technology Kharagpur India Department of Chemistry Osmania University Hyderabad India Department of Chemistry Pondicherry University Pondicherry India Department of Chemistry I

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Synthesis and properties of poly(1-naphthylacetylene) and poly(9-anthrylacetylene)

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Journal of Polymer science 2000年第3期37卷

作者： Kazunari Nanjo S. M. Abdul Karim Ryoji Nomura Tatsuo Wada Hiroyuki Sasabe Toshio Masuda Department of Polymer Chemistry Kyoto University Kyoto 606-8501 Japan Core Research for Evolutional Science and Technology (CREST) JST and Frontier Research Program The Institute of Physical and Chemical Research (RIKEN) 2-1 Hirosawa Wako Saitama 351-0198 Japan

Polymerizations of 1-naphthylacetylene (1-NA) and 9-anthrylacetylene (9-AA) by various transition metal catalysts were studied, and properties of the polymers were clarified. 1-NA polymerized with WCl 6 -based catalysts to offer dark purple polymers in good yield. Especially, a binary catalyst composed of WCl 6 and Ph 3 Bi gave a polymer with high molecular weight ( M w = 140×10 3 ) and sufficient solubility in common solvents. The use of Mo and Rh catalysts, in contrast, resulted in the formation of insoluble red poly(1-NA)s. 9-AA gave insoluble polymers by both WCl 6 - and MoCl 5 -based catalysts in moderate to good yields. Copolymerization of 9-AA with 1-NA by WCl 6 –Ph 3 Bi provided a soluble copolymer which exhibited the largest third-order nonlinear optical susceptibilities (χ (3) (−3ω; ω, ω, ω) = 40×10 −12 ) among all the substituted polyacetylenes synthesized so far. © 1999 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 37: 277–282, 1999

关键词： metathesis polymerization poly(arylacetylene) conjugated polymer tungsten catalyst molybdenum catalyst nonlinear optical property

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