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Transverse magnetic defect modes in two-dimensional triangular-lattice photonic crystals

Physical Review E 2001年第5期64卷 056614-056614页

作者： N. Stojić J. Glimm Y. Deng J. W. Haus Department of Physics and Astronomy State University of New York at Stony Brook Stony Brook New York 11794-3381 Center for Data Intensive Computing Brookhaven National Laboratory Building 463B Upton New York 11973-5751 Department of Applied Mathematics and Statistics State University of New York at Stony Brook Stony Brook New York 11794-3600 Electro-Optics Program The University of Dayton Dayton Ohio 45469-0254

We present a numerical study of the localized transverse magnetic (TM) defect modes in a two-dimensional, triangular-lattice photonic crystal. The sample consists of an array of circular, air cylinders in a dielectric medium (GaAs). The defect modes were calculated by using a parallel version of the finite-difference time-domain method on the Yee mesh. To validate our computations the results for the transverse electric case were checked against experimental results and the numerical results using a different method. We study the spatial symmetry for TM modes, obtained by changing the dipole excitation frequency. Also, we vary the defect-cylinder radius to tune the resonant frequency across the band gap. The TM mode is found to be highly localized at the defect in the photonic lattice.

关键词： Electromagnetic wave propagation

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Reviews

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Metascience 2001年第1期10卷 50-149页

作者： Hugh Clapin Katherine Neal John Wennerbom Barbara Nunn Deborah Dysart Andy Pickering Lisa Featherstone Hiram Caton Dale Jacquette Laura Ruetsche William A. Turner Cornelia Lüdecke Birgit Lohmann James Ladyman Jonathan Coopersmith David Oldroyd Dennis Dean Michael Ruse Nicolas Rasmussen William N. Kaghan Martin Bridgstock Geoffrey Cocks Stephanie H. Kenen Ivan Crozier Sokhieng Au Desmond Barrett Mark Cortiula Ian D. Lawrie Department of Philosophy The University of Sydney Sydney Australia Unit for History and Philosophy of Science The University of Sydney Sydney Australia Philosophy Program Research School of Social Sciences Australian National University Canberra Australia Applied Linguistic Institute and Department of English University of Missouri Kansas City USA Department of Sociology University of Illinois Urbana USA Department of Modern History Macquarie University Sydney Australia Faculty of Arts Griffith University Nathan Australia Department of Philosophy Pennsylvania State University University Park USA Department of Philosophy University of Pittsburgh Pittsburgh USA LIMSI-CNRS Orsay Cedex France Institut für Geschichte der Naturwissenschaften Ludwig-Maximilians-Universität München Germany School of Science Griffith University Nathan Australia Department of Philosophy University of Bristol Bristol UK Department of History Texas A&M University College Station USA School of Science and Technology Studies The University of New South Wales Sydney Australia Evanston USA Philosophy Department Florida State University Tallahassee USA Technology Management and Technical Communications Sakson & Taylor Seattle USA Department of History Albion College Albion USA Department of History of Science Harvard University Cambridge USA History of Science and Technology University of California Berkeley USA Division of Science and Technology Museum of Applied Arts and Sciences Sydney Australia Department of Physics and Astronomy The University of Leeds Leeds UK

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Centrality Dependence of Charged Particle Multiplicity in Au-Au Collisions at sNN=130GeV

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Physical Review Letters 2001年第16期86卷 3500-3500页

作者： K. Adcox S. S. Adler N. N. Ajitanand Y. Akiba J. Alexander L. Aphecetche Y. Arai S. H. Aronson R. Averbeck T. C. Awes K. N. Barish P. D. Barnes J. Barrette B. Bassalleck S. Bathe V. Baublis A. Bazilevsky S. Belikov F. G. Bellaiche S. T. Belyaev M. J. Bennett Y. Berdnikov S. Botelho M. L. Brooks D. S. Brown N. Bruner D. Bucher H. Buesching V. Bumazhnov G. Bunce J. Burward-Hoy S. Butsyk T. A. Carey P. Chand J. Chang W. C. Chang L. L. Chavez S. Chernichenko C. Y. Chi J. Chiba M. Chiu R. K. Choudhury T. Christ T. Chujo M. S. Chung P. Chung V. Cianciolo B. A. Cole D. G. D'Enterria G. David H. Delagrange A. Denisov A. Deshpande E. J. Desmond O. Dietzsch B. V. Dinesh A. Drees A. Durum D. Dutta K. Ebisu Y. V. Efremenko K. El Chenawi H. En'yo S. Esumi L. Ewell T. Ferdousi D. E. Fields S. L. Fokin Z. Fraenkel A. Franz A. D. Frawley S.-Y. Fung S. Garpman T. K. Ghosh A. Glenn A. L. Godoi Y. Goto S. V. Greene M. Grosse Perdekamp S. K. Gupta W. Guryn H.-Å. Gustafsson J. S. Haggerty H. Hamagaki A. G. Hansen H. Hara E. P. Hartouni R. Hayano N. Hayashi X. He T. K. Hemmick J. Heuser M. Hibino J. C. Hill D. S. Ho K. Homma B. Hong A. Hoover T. Ichihara K. Imai M. S. Ippolitov M. Ishihara B. V. Jacak W. Y. Jang J. Jia B. M. Johnson S. C. Johnson K. S. Joo S. Kametani J. H. Kang M. Kann S. S. Kapoor S. Kelly B. Khachaturov A. Khanzadeev J. Kikuchi D. J. Kim H. J. Kim S. Y. Kim Y. G. Kim W. W. Kinnison E. Kistenev A. Kiyomichi C. Klein-Boesing S. Klinksiek L. Kochenda D. Kochetkov V. Kochetkov D. Koehler T. Kohama A. Kozlov P. J. Kroon K. Kurita M. J. Kweon Y. Kwon G. S. Kyle R. Lacey J. G. Lajoie J. Lauret A. Lebedev D. M. Lee M. J. Leitch X. H. Li Z. Li D. J. Lim M. X. Liu X. Liu Z. Liu C. F. Maguire J. Mahon Y. I. Makdisi V. I. Manko Y. Mao S. K. Mark S. Markacs G. Martinez M. D. Marx A. Masaike F. Matathias T. Matsumoto P. L. McGaughey E. Melnikov M. Merschmeyer F. Messer M. Messer Y. Miake T. E. Miller A. Milov S. Mioduszewski R. E. Mischke G. C. Mishra J. T. Mitchell A. K. Mohanty D. P. Morrison J. M. Moss F. Mühlbacher M. Muniru Vanderbilt University Nashville Tennessee 37235 Brookhaven National Laboratory Upton New York 11973-5000 Chemistry Department State University of New York–Stony Brook Stony Brook New York 11794 KEK High Energy Accelerator Research Organization Tsukuba-shi Ibaraki-ken 305-0801 Japan SUBATECH (Ecole des Mines de Nantes IN2P3/CNRS Universite de Nantes) BP 20722-44307 Nantes-cedex 3 France Department of Physics and Astronomy State University of New York–Stony Brook Stony Brook New York 11794 Oak Ridge National Laboratory Oak Ridge Tennessee 37831 University of California–Riverside Riverside California 92521 Los Alamos National Laboratory Los Alamos New Mexico 87545 McGill University Montreal Quebec H3A 2T8 Canada University of New Mexico Albuquerque New Mexico Institut für Kernphysik University of Münster D-48149 Münster Germany PNPI Petersburg Nuclear Physics Institute Gatchina Russia Institute for High Energy Physics (IHEP) Protvino Russia RIKEN BNL Research Center Brookhaven National Laboratory Upton New York 11973-5000 Iowa State University Ames Iowa 50011 Russian Research Center “Kurchatov Institute ” Moscow Russia St. Petersburg State Technical University St. Petersburg Russia Universidade de São Paulo Instituto de Física Caixa Postal 66318 Sào Paulo CEP05315-970 Brazil New Mexico State University Las Cruces New Mexico 88003 Bhabha Atomic Research Centre Bombay 400 085 India Institute of Physics Academia Sinica Taipei 11529 Taiwan Columbia University New York New York 10027 and Nevis Laboratories Irvington New York 10533 Institute of Physics University of Tsukuba Tsukuba Ibaraki 305 Japan Korea University Seoul 136-701 Korea Nagasaki Institute of Applied Science Nagasaki-shi Nagasaki 851-0193 Japan Kyoto University Kyoto 606 Japan RIKEN (The Institute of Physical and Chemical Research) Wako Saitama 351-0198 Japan Weizmann Institute Rehovot 76100 Israel Florida State University Tallahassee Florida 32306 Department of Physics Lund Uni

We present results for the charged-particle multiplicity distribution at midrapidity in Au-Au collisions at sNN=130GeV measured with the PHENIX detector at RHIC. For the 5% most central collisions we find dNch/dη|η=0=622±1(stat)±41(syst). The results, analyzed as a function of centrality, show a steady rise of the particle density per participating nucleon with centrality.

关键词： High energy physics

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Measurement of the Midrapidity Transverse Energy Distribution from sNN=130GeV Au+Au Collisions at RHIC

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Physical Review Letters 2001年第5期87卷 052301-052301页

作者： K. Adcox S. S. Adler N. N. Ajitanand Y. Akiba J. Alexander L. Aphecetche Y. Arai S. H. Aronson R. Averbeck T. C. Awes K. N. Barish P. D. Barnes J. Barrette B. Bassalleck S. Bathe V. Baublis A. Bazilevsky S. Belikov F. G. Bellaiche S. T. Belyaev M. J. Bennett Y. Berdnikov S. Botelho M. L. Brooks D. S. Brown N. Bruner D. Bucher H. Buesching V. Bumazhnov G. Bunce J. Burward-Hoy S. Butsyk T. A. Carey P. Chand J. Chang W. C. Chang L. L. Chavez S. Chernichenko C. Y. Chi J. Chiba M. Chiu R. K. Choudhury T. Christ T. Chujo M. S. Chung P. Chung V. Cianciolo B. A. Cole D. G. D'Enterria G. David H. Delagrange A. Denisov A. Deshpande E. J. Desmond O. Dietzsch B. V. Dinesh A. Drees A. Durum D. Dutta K. Ebisu Y. V. Efremenko K. El Chenawi H. En'yo S. Esumi L. Ewell T. Ferdousi D. E. Fields S. L. Fokin Z. Fraenkel A. Franz A. D. Frawley S.-Y. Fung S. Garpman T. K. Ghosh A. Glenn A. L. Godoi Y. Goto S. V. Greene M. Grosse Perdekamp S. K. Gupta W. Guryn H.-Å. Gustafsson J. S. Haggerty H. Hamagaki A. G. Hansen H. Hara E. P. Hartouni R. Hayano N. Hayashi X. He T. K. Hemmick J. M. Heuser M. Hibino J. C. Hill D. S. Ho K. Homma B. Hong A. Hoover T. Ichihara K. Imai M. S. Ippolitov M. Ishihara B. V. Jacak W. Y. Jang J. Jia B. M. Johnson S. C. Johnson K. S. Joo S. Kametani J. H. Kang M. Kann S. S. Kapoor S. Kelly B. Khachaturov A. Khanzadeev J. Kikuchi D. J. Kim H. J. Kim S. Y. Kim Y. G. Kim W. W. Kinnison E. Kistenev A. Kiyomichi C. Klein-Boesing S. Klinksiek L. Kochenda D. Kochetkov V. Kochetkov D. Koehler T. Kohama A. Kozlov P. J. Kroon K. Kurita M. J. Kweon Y. Kwon G. S. Kyle R. Lacey J. G. Lajoie J. Lauret A. Lebedev D. M. Lee M. J. Leitch X. H. Li Z. Li D. J. Lim M. X. Liu X. Liu Z. Liu C. F. Maguire J. Mahon Y. I. Makdisi V. I. Manko Y. Mao S. K. Mark S. Markacs G. Martinez M. D. Marx A. Masaike F. Matathias T. Matsumoto P. L. McGaughey E. Melnikov M. Merschmeyer F. Messer M. Messer Y. Miake T. E. Miller A. Milov S. Mioduszewski R. E. Mischke G. C. Mishra J. T. Mitchell A. K. Mohanty D. P. Morrison J. M. Moss F. Mühlbacher M. Mun Vanderbilt University Nashville Tennessee 37235 Brookhaven National Laboratory Upton New York 11973-5000 Chemistry Department State University of New York–Stony Brook Stony Brook New York 11794 KEK High Energy Accelerator Research Organization Tsukuba-shi Ibaraki-ken 305-0801 Japan SUBATECH (Ecole des Mines de Nantes IN2P3/CNRS Universite de Nantes) BP 20722-44307 Nantes-Cedex 3 France Department of Physics and Astronomy State University of New York–Stony Brook Stony Brook New York 11794 Oak Ridge National Laboratory Oak Ridge Tennessee 37831 University of California–Riverside Riverside California 92521 Los Alamos National Laboratory Los Alamos New Mexico 87545 McGill University Montreal Quebec Canada H3A 2T8 University of New Mexico Albuquerque New Mexico 87131 Institut für Kernphysik University of Münster D-48149 Münster Germany PNPI Petersburg Nuclear Physics Institute Gatchina Russia Institute for High Energy Physics (IHEP) Protvino Russia RIKEN BNL Research Center Brookhaven National Laboratory Upton New York 11973-5000 Iowa State University Ames Iowa 50011 Russian Research Center “Kurchatov Institute” Moscow Russia St. Petersburg State Technical University St. Petersburg Russia Universidade de São Paulo Instituto de Física Caixa Postal 66318 São Paulo CEP05315-970 Brazil New Mexico State University Las Cruces New Mexico 88003 Bhabha Atomic Research Centre Bombay 400 085 India Institute of Physics Academia Sinica Taipei 11529 Taiwan Columbia University New York New York 10027 and Nevis Laboratories Irvington New York 10533 Institute of Physics University of Tsukuba Tsukuba Ibaraki 305 Japan Korea University Seoul 136-701 Korea Nagasaki Institute of Applied Science Nagasaki-shi Nagasaki 851-0193 Japan Kyoto University Kyoto 606 Japan RIKEN (The Institute of Physical and Chemical Research) Wako Saitama 351-0198 Japan Weizmann Institute Rehovot 76100 Israel Florida State University Tallahassee Florida 32306 Department of Physics L

The first measurement of energy produced transverse to the beam direction at the Relativistic Heavy-Ion Collider at Brookhaven National Laboratory is presented. The midrapidity transverse energy density per participating nucleon rises steadily with the number of participants, closely paralleling the rise in charged-particle density, such that 〈ET〉/〈Nch〉 remains relatively constant as a function of centrality. The energy density calculated via Bjorken’s prescription for the 2% most central Au+Au collisions at sNN=130GeV is at least εBj=4.6GeV/fm3, which is a factor of 1.6 larger than found at sNN=17.2GeV ( Pb+Pb at CERN).

关键词： Particle beam extraction

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Suppression of Hadrons with Large Transverse Momentum in Central Au+Au Collisions at sNN=130GeV

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Physical Review Letters 2001年第2期88卷 022301-022301页

作者： K. Adcox S. S. Adler N. N. Ajitanand Y. Akiba J. Alexander L. Aphecetche Y. Arai S. H. Aronson R. Averbeck T. C. Awes K. N. Barish P. D. Barnes J. Barrette B. Bassalleck S. Bathe V. Baublis A. Bazilevsky S. Belikov F. G. Bellaiche S. T. Belyaev M. J. Bennett Y. Berdnikov S. Botelho M. L. Brooks D. S. Brown N. Bruner D. Bucher H. Buesching V. Bumazhnov G. Bunce J. Burward-Hoy S. Butsyk T. A. Carey P. Chand J. Chang W. C. Chang L. L. Chavez S. Chernichenko C. Y. Chi J. Chiba M. Chiu R. K. Choudhury T. Christ T. Chujo M. S. Chung P. Chung V. Cianciolo B. A. Cole D. G. D'Enterria G. David H. Delagrange A. Denisov A. Deshpande E. J. Desmond O. Dietzsch B. V. Dinesh A. Drees A. Durum D. Dutta K. Ebisu Y. V. Efremenko K. El Chenawi H. En'yo S. Esumi L. Ewell T. Ferdousi D. E. Fields S. L. Fokin Z. Fraenkel A. Franz A. D. Frawley S.-Y. Fung S. Garpman T. K. Ghosh A. Glenn A. L. Godoi Y. Goto S. V. Greene M. Grosse Perdekamp S. K. Gupta W. Guryn H.-Å. Gustafsson J. S. Haggerty H. Hamagaki A. G. Hansen H. Hara E. P. Hartouni R. Hayano N. Hayashi X. He T. K. Hemmick J. M. Heuser M. Hibino J. C. Hill D. S. Ho K. Homma B. Hong A. Hoover T. Ichihara K. Imai M. S. Ippolitov M. Ishihara B. V. Jacak W. Y. Jang J. Jia B. M. Johnson S. C. Johnson K. S. Joo S. Kametani J. H. Kang M. Kann S. S. Kapoor S. Kelly B. Khachaturov A. Khanzadeev J. Kikuchi D. J. Kim H. J. Kim S. Y. Kim Y. G. Kim W. W. Kinnison E. Kistenev A. Kiyomichi C. Klein-Boesing S. Klinksiek L. Kochenda V. Kochetkov D. Koehler T. Kohama D. Kotchetkov A. Kozlov P. J. Kroon K. Kurita M. J. Kweon Y. Kwon G. S. Kyle R. Lacey J. G. Lajoie J. Lauret A. Lebedev D. M. Lee M. J. Leitch X. H. Li Z. Li D. J. Lim M. X. Liu X. Liu Z. Liu C. F. Maguire J. Mahon Y. I. Makdisi V. I. Manko Y. Mao S. K. Mark S. Markacs G. Martinez M. D. Marx A. Masaike F. Matathias T. Matsumoto P. L. McGaughey E. Melnikov M. Merschmeyer F. Messer M. Messer Y. Miake T. E. Miller A. Milov S. Mioduszewski R. E. Mischke G. C. Mishra J. T. Mitchell A. K. Mohanty D. P. Morrison J. M. Moss F. Mühlbacher M. Mu Vanderbilt University Nashville Tennessee 37235 Brookhaven National Laboratory Upton New York 11973-5000 Chemistry Department State University of New York–Stony Brook Stony Brook New York 11794 KEK High Energy Accelerator Research Organization Tsukuba-shi Ibaraki-ken 305-0801 Japan SUBATECH (Ecole des Mines de Nantes IN2P3/CNRS Universite de Nantes) BP 20722-44307 Nantes-cedex 3 France Department of Physics and Astronomy State University of New York–Stony Brook Stony Brook New York 11794 Oak Ridge National Laboratory Oak Ridge Tennessee 37831 University of California–Riverside Riverside California 92521 Los Alamos National Laboratory Los Alamos New Mexico 87545 McGill University Montreal Quebec H3A 2T8 Canada University of New Mexico Albuquerque New Mexico 87131 Institut für Kernphysik University of Münster D-48149 Münster Germany PNPI Petersburg Nuclear Physics Institute Gatchina Russia Institute for High Energy Physics (IHEP) Protvino Russia RIKEN BNL Research Center Brookhaven National Laboratory Upton New York 11973-5000 Iowa State University Ames Iowa 50011 Russian Research Center “Kurchatov Institute” Moscow Russia St. Petersburg State Technical University St. Petersburg Russia Universidade de São Paulo Instituto de Física Caixa Postal 66318 São Paulo CEP05315-970 Brazil New Mexico State University Las Cruces New Mexico 88003 Bhabha Atomic Research Centre Bombay 400 085 India Institute of Physics Academia Sinica Taipei 11529 Taiwan Columbia University New York New York 10027 and Nevis Laboratories Irvington New York 10533 Institute of Physics University of Tsukuba Tsukuba Ibaraki 305 Japan Korea University Seoul 136-701 Korea Nagasaki Institute of Applied Science Nagasaki-shi Nagasaki 851-0193 Japan Kyoto University Kyoto 606 Japan RIKEN (The Institute of Physical and Chemical Research) Wako Saitama 351-0198 Japan Weizmann Institute Rehovot 76100 Israel Florida State University Tallahassee Florida 32306 Department of Physics L

Transverse momentum spectra for charged hadrons and for neutral pions in the range 1GeV/c<pT<5GeV/c have been measured by the PHENIX experiment at RHIC in Au+Au collisions at sNN=130GeV. At high pT the spectra f... 详细信息

Transverse momentum spectra for charged hadrons and for neutral pions in the range 1GeV/c

关键词： High energy physics

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Influence of short-range interference on ionization threshold law

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Physical Review A 1999年第1期61卷 014901-014901页

作者： Naoyuki Miyashita Shinichi Watanabe Michio Matsuzawa Joseph H. Macek Department of Functional Molecular Science The Graduate University for Advanced Studies Institute for Molecular Science 38 Nishigonaka Myodaiji Okazaki 444-8585 Japan Department of Applied Physics and Chemistry University of Electro-Communications 1-5-1 Chofu-ga-oka Chofu-shi Tokyo 182-8585 Japan Department of Physics & Astronomy University of Tennessee Knoxville Tennessee 37996-1501Oak Ridge National Laboratory P.O. Box 2008 Oak Ridge Tennessee 37831

Electron-impact ionization of the collinear Z=1/4 model atom is investigated in order to examine a nonclassical behavior of the ionization cross sections. Slightly above the ionization threshold, ab initio calculations reveal a distinctive dip due to short-range dynamics. The dip is a strongly energy-dependent feature in the usually smooth and structureless ionization cross section and is foreign to treatments based on classical, as well as semiclassical mechanics. The Z=1/4 model thus serves as a counterexample to the standard Wannier treatment of near-threshold ionization. The hyperspherical hidden-crossing theory is applied to identify the origin of the dip.

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Contributory presentations/posters

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Journal of Biosciences 1999年第1期24卷 33-198页

作者： N. Manoj V. R. Srinivas A. Surolia M. Vijayan K. Suguna R. Ravishankar R. Schwarzenbacher K. Zeth Diederichs G. M. Kostner A. Gries P. Laggner R. Prassl Madhusudan Pearl Akamine Nguyen-huu Xuong Susan S. Taylor M. Bidva Sagar K. Saikrishnan S. Roy K. Purnapatre P. Handa U. Varshney B. K. Biswal N. Sukumar J. K. Mohana Rao A. Johnson Vasantha Pattabhi S. Sri Krishna Mira Sastri H. S. Savithri M. R. N. Murthy Bindu Pillai Kannan M. V. Hosur Mukesh Kumar Swati Patwardhan K. K. Kannan B. Padmanabhaa S. Sasaki-Sugio M. Nukaga T. Matsuzaki S. Karthikevan S. Sharma A. K. Sharma M. Paramasivam P. Kumar J. A. Khan S. Yadav A. Srinivasan T. P. Singh S. Gourinath Neelima Alam A. Srintvasan Vikas Chandra Punit Kaur Ch. Betzel S. Ghosh A. K. Bera S. Bhattacharya S. Chakraborty A. K. Pal B. P. Mukhopadhyay I. Dey U. Haldar Asok Baneriee Jozef Sevcik Adriana Solovicova K. Sekar M. Sundaralingam N. Genov Dong-cai Liang Tao Jiang Ji-ping Zhang Wen-rui Chang Wolfgang Jahnke Marcel Blommers S. C. Panchal R. V. Hosur Bindu Pillay Puniti Mathur S. Srivatsun Ratan Mani Joshi N. R. Jaganathan V. S. Chauhan H. S. Atreya S. C. Sahu K. V. R. Chary Girjesh Govil Elisabeth Adjadj Éric Quinjou Nadia Izadi-Pruneyre Yves Blouquit Joël Mispelter Bernadette Heyd Guilhem Lerat Philippe Milnard Michel Desmadreil Y. Lin B. D. Nageswara Rao Vidva Raghunathan Mei H. Chau Prashant Pesais Sudha Srivastava Evans Coutinho Anil Saran Leizl F. Sapico Jayson Gesme Herbert Lijima Raymond Paxton Thamarapu Srikrishnan C. R. Grace G. Nagenagowda A. M. Lynn Sudha M. Cowsik Sarata C. Sahu S. Chauhan A. Bhattacharya G. Govil Anil Kumar Maurizio Pellecchia Erik R. P. Zuiderweg Keiichi Kawano Tomoyasu Aizawa Naoki Fujitani Yoichi Hayakawa Atsushi Ohnishi Tadayasu Ohkubo Yasuhiro Kumaki Kunio Hikichi Katsutoshi Nitta V. Rani Parvathy R. M. Kini Takumi Koshiba Yoshihiro Kobashigawa Min Yao Makoto Demura Astushi Nakagawa Isao Tanaka Kunihiro Kuwajima Jens Linge Seán O. Donoghue Michael Nilges G. Chakshusmathi Girish S. Ratnaparkhi P. K. Madhu R. Varadarajan C. Tetreau Molecular Biophysics Unit Indian Institute of Science Bangalore India Austrian Academy of Sciences Institute of Biophysics and X-ray Structure Research Graz Austria Faculty of Biology University of Konstanz Germany Institute of Medical Biochemistry University of Graz Austria Howard Huges Medical Institute Department of Chemistry & Biochemistry University of California La Jolla USA Department of Chemistry & Biochemistry University of California San Diego La Jolla USA Molecular Biophysics Unit India Department of Microbiology &Cell Biology Indian Institute of Science Bangalore India Macromolecular Structure Laboratory NCI - Frederick Cancer Research and Development Center ABL - Basic Research Program Frederick USA Department of Crystallography and Biophysics University of Madras Chennai Biochemistry Department Indian Institute of Science Bangalore India Condensed Matter Physics Division B.A.R.C. Trombay Mumbai Condensed Matter Physics Division Bhabha Atomic Research Centre Trombay Mumbai IMCB The University of Tokyo Tokyo Japan Mitsubishi Chemical Corporation Yokohama Research Center Yokohama Japan Faculty of Pharmaceutical Sciences Chiba University Chiba Japan Department of Biophysics All India Institute of Medical Sciences New Delhi India Department of Biophysics All India Institute of Medical sciences New Delhi India Institüt Physiologische Chemie Hamburg Germany Biophysics Department Bose Institute Calcutta India Slovak Academy of Sciences Institute of Molecular Biology Bratislava Slovakia Indian Institute of Science Bioinformatics Centre Bangalore Departments of Chemistry and Biochemistry Biological Macromolecular Structure Center USA Bulgarian Academy of Sciences Institute of Organic Chemistry Sofia Bulgaria Chinese Academy of Sciences Institute of Biophysics Beijing China Novartis Pharma AG Preclinical Research Basel Switzerland Department of Chemical Sciences Tata Institute of Fundamental Research Mumbai India Solid State Physics Div

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Behavior of Charge Density Waves in a One-Dimensional Organic Conductor Visualized by Scanning Tunneling Microscopy

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Physical Review Letters 1998年第15期81卷 3187-3187页

作者： Tetsuya Nishiguchi Masami Kageshima Norihiko Ara-Kato Akira Kawazu Department of Applied Physics Graduate School of Engineering The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan Frontier Research Program The Institute of Physical and Chemical Research (RIKEN) 2-1 Hirosawa Wako Saitama 351-0198 Japan

Charge density waves (CDW) in a tetrathiafulvalene-tetracyanoquinodimethane (TTF-TCNQ) single crystal have been studied with molecular resolution using a low temperature scanning tunneling microscope (STM). For the first time the periodicities of the CDW along both the a and b axes have been observed and were found to be coincident with those of the 2kF CDW. The influence of crystal singularities on the ordering of the CDW along the a axis was also revealed.

关键词： Organic conductors

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Estimating acoustic radiation from a Bernoulli-Euler beam using shaped polyvinylidene fluoride film

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JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 1997年第6期101卷 3475-3485页

作者： Scott, BL Sommerfeldt, SD Graduate Program in Acoustics Pennsylvania State University University Park PA 16802 United States Department of Physics and Astronomy Brigham Young University Provo UT 84602 United States

This paper examines numerically the use of arrayed shaped polyvinylidene fluoride film sensors to obtain an estimate of the far-field radiated power from a clamped-clamped Bernoulli-Euler beam excited by a sinusoidal point force. Distributed sensors are designed that are sensitive to the radiated power. Fourier analysis of point and distributed sensor outputs is used to estimate the beam's radiated power. The numerical results of the estimated power obtained from the point and distributed sensors are compared to those predicted by the theoretical model and the performance of the two sensor types is assessed. The results show that the shaped sensors provide a reasonable estimate of the strain transforms over the region of interest, when compared to the exact theoretical predictions, for the first five beam resonance frequencies and for frequencies located approximately midway between resonance frequencies. The distributed sensors also give consistently better predictions of the strain transforms for all frequencies considered when compared to the point sensor results. The power predictions using shaped sensors range from -1 to 3 dB relative to the exact theoretical results for most of the frequencies analyzed. This contrasts to the 36-68 dB range of relative power estimates using point sensors. (C) 1997 Acoustical Society of America.

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High-frequency analysis of radiation field excited by incident whispering-gallery mode over concave-to-convex boundary

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ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS 1996年第7期79卷 10-21页

作者： Goto, K Ishihara, T National Defense Academy Yokosuka Japan 239 Graduated in 1984 from the Department of Electrical Engineering National Defense Academy where he completed the graduate program in 1989. At present he is a Research Associate. He has been engaged in research on the propagation and scattering of the electromagnetic waves. Received his B.S. (equivalent) degree in Electrical Engineering from the National Defense Academy of Japan in 1970 his M.S. and Ph.D. degrees from the Polytechnic Institute of New York (presently the Polytechnic University) Farmingdale NY in 1975 and 1978 respectively and a Dr. of Eng. degree from Tohoku University Sendai Japan in 1983. From June to December 1978 he was a Research Fellow of the Polytechnic Institute of New York. From January 1979 to March 1982 he was with the Defense Research Center of the Defense Agency. In April 1982 he became a Lecturer at the National Defense Academy. From September 1984 through February 1985 he was a Visiting Scholar at the Polytechnic Institute of New York. In 1985 he became an Associate Professor at the National Defense Academy where he was promoted to Professor in 1990. He has been engaged in research on propagation and scattering of electromagnetic waves and acoustic waves. He is a member of the IEEE the Acoustic Society of Japan the Applied Physics Society and the Ocean Acoustic Society.

An asymptotic method of analysis is studied for the radiation field when the lowest-order whispering gallery (WG) modes propagating from the concave side of the concave-to-convex boundary with a variable radius of curvature are radiated into the free-space on the convex side. The modal ray congruences of the WG mode are radiated into the free space after being converted to geometrical rays. Both the caustics and the shadow boundaries are created in the space. As the expression of the radiated field near the caustic, the modal rays incident into the concave part are used for deriving the physical optics integral. By applying the high-frequency asymptotic analysis in the case of two saddle points closely spaced to the evaluation of the integral, the uniform asymptotic solution was derived. Also, as the radiating field on the sufficiently shadow side of the caustic, the complex ray solution was derived. On the other hand, as the radiating field in the transition region near the shadow boundary caused by the convex region, an asymptotic solution was derived in the form of an extension of the conventional UTD (Uniform GTD) to the case where the geometrical ray converted from the modal ray is incident to the boundary. The numerical results obtained by various asymptotic expressions are compared with the reference solution and the geometrical optics figure drawn by the modal ray tracing. The effectiveness of the asymptotic solution and the propagation and radiation phenomena of the WG mode were derived.

关键词： whispering-gallery mode concave-to-convex boundary radiating field high-frequency asymptotic analysis modal ray

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