著者

Junichiro MAKINO Akio MORITA Department of Natural and Artificial Systems College of Arts and Sciences University of Tokyo Department of Chemistry College of Arts and Sciences University of Tokyo

雑誌

Progress of theoretical physics = Progress of theoretical physics (ISSN:0033068X)

巻号頁・発行日

vol.73, no.5, pp.1264-1267, 1985-05-25

被引用文献数

6

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It is shown by carrying out numerical calculations based on the stochastic Verhulst equation that the average value of the pupulation gives only a single peak, which contradicts with the previous result with several peaks.

著者

Sigenobu SUNAKAWA Department of Physics Osaka University

雑誌

Progress of theoretical physics = Progress of theoretical physics (ISSN:0033068X)

巻号頁・発行日

vol.14, no.3, pp.175-197, 1955-09

被引用文献数

13

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The time-dependent theory of scattering is reformulated. In §1, it is developed on the basis of a new limiting process which is self-consistent, and the equivalence is shown of Heisenberg's S-matrix and Dyson's one, when the total Hamiltonian permits the existence of bound states. In §2, a theory of scattering of wave packet is proposed in conformity with the physical picture. The damping factor e^<-ε│t│> is derived from the amplitude of the wave packet. In §3, the rearrangement scattering is treated on the basis of the wave packet formalism.

著者

Ichiro TSUDA Edgar KOERNER Hiroshi SHIMIZU Bioholonics Research Project Research Development Corporation of Japan Bioholonics Research Project Research Development Corporation of Japan Faculty of Pharmaceutical Sciences Department of Biophysics University of Tokyo

雑誌

Progress of theoretical physics = Progress of theoretical physics (ISSN:0033068X)

巻号頁・発行日

vol.78, no.1, pp.51-71, 1987-07-25

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A model which can perform learning, formation of memory without teacher for successive memory recalls is presented. The philosophical background of the study is summarized. The investigated network consists of two sets both composed of asynchronously firing model neurons. One set of neurons is responsible for the field effect, and the other is introduced as an input/output module. The field effect is given in the form of the system's self-response. It is shown that positive end negative global feedbacks by the field effect play an essential role in the successive recall of stored patterns. The possibility that these proposed mechanisms are implemented in the brain is discussed. We obtained a quasi-deterministic law on the level of a macrovariable concerning a random successive recall of memory representations by taking a Lorenz-plot of this macrovariable. We show that this macroscopic order is deterministic chaos steming from collapse of tori and this type of chaos can be an effective gadget of memory traces.

著者

Persides S. Ioannides I. Department of Astronomy University of Thessaloniki Department of Astronomy University of Thessaloniki

出版者

Published for the Research Institute for Fundamental Physics by Physical Society of Japan

雑誌

Progress of theoretical physics = Progress of theoretical physics (ISSN:0033068X)

巻号頁・発行日

vol.58, no.3, pp.829-841, 1977-09-25

被引用文献数

5

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The behavior of asymptotically flat Einstein-Maxwell fields is studied in generalized coordinates u, r, θ and φ that become null-spherical only at infinity. The field equations satisfied by the metric and the electromagnetic tensors are derived in the first and second approximations, i.e., for the first and second non-zero powers of r^<-1> in the Einstein and Maxwell equations. The peeling property of the tetrad components of the Weyl and the electromagnetic tensors is established for arbitrary tetrad. From the Landau-Lifshitz complex the energy and linear momentum radiated per unit time by the gravitational and the electromagnetic fields are expressed in terms of the gravitational and electromagnetic news functions in the generalized coordinates. Finally the transformations which preserve the form of the metric are examined.

著者

FermilabE653Collaboration USHIDA N. MOKHTARANI A. PAOLONE V.S. VOLK J.T. WILCOX J.O. YAGER P.M. EDELSTEIN R.M. FREYBERGER A.P. GIBAUT D.B. LIPTON R.J. NICHOLS W.R. POTTER D.M. RUSS J.S. ZHANG C. ZHANG Y. JANG H.I. KIM J.Y. KIM T.I. LIM I.T. PAC M.Y. BALLER B.R. STEFANSKI R.J. NAKAZAWA K. CHUNG K.S. CHUNG S.H. KIM D.C. PARK I.G. PARK M.S. SONG J.S. YOON C.S. CHIKAWA M. ABE T. FUJII T. FUJIOKA G. FUJIWARA K. FUKUSHIMA H. HARA T. TAKAHASHI Y. TARUMA K. TSUZUKI Y. YOKOYAMA C. CHANG S.D. CHEON B.G. CHO J.H. KANG J.S. KIM C.O. KIM K.Y. KIM T.Y. LEE J.C. LEE S.B. LIM G.Y. NAM S.W. SHIN T.S. SIM K.S. WOO J.K. ISOKANE Y. TSUNEOKA Y. AOKI S. GAUTHIER A. HOSHINO K. KITAMURA H. KOBAYASHI M. MIYANISHI M. NAKAMURA K. NAKAMURA M. NAKAMURA Y. NAKANISHI S. NIU K. NIWA K. NOMURA M. TAJIMA H. YOSHDA S. ARYAL M. DUNLEA J.M. FREDERIKSEN S.G. KURAMATA S. LUNDBERG B.G. OLEYNIK G.A. REAY N.W. REIBEL K. SIDWELL R.A. STANTON N.R. MORIYAMA K. SHIBATA H. KALBFLEISCH G.R. SKUBIC P. SNOW J.M. WILLIS S.E. KUSUMOTO O. NAKAMURA K. OKUSAWA T. TERANAKA M. TOMINAGA T. YOSHIDA T. YUUKI H. OKABE H. YOKOTA J. ADACHI M. KAZUNO M. NIU E. SHIBUYA H. WATANABE S. OHTSUKA I. SATO Y. TEZUKA I. BAHK S.Y. KIM S.K. Aichi University of Education Aichi University of Education University of California (Davis) University of California (Davis) University of California (Davis) University of California (Davis) University of California (Davis) Carnegie-Mellon University Carnegie-Mellon University Carnegie-Mellon University Carnegie-Mellon University Carnegie-Mellon University Carnegie-Mellon University Carnegie-Mellon University Carnegie-Mellon University Carnegie-Mellon University Chonnam National University Chonnam National University Chonnam National University Chonnam National University Chonnam National University Fermi National Accelerator Laboratory Fermi National Accelerator Laboratory Gifu University Gyeongsang National University Gyeongsang National University Gyeongsang National University Gyeongsang National University Gyeongsang National University Gyeongsang National University Gyeongsang National University Kinki University Kobe University Kobe University Kobe University Kobe University Kobe University Kobe University Kobe University Kobe University Kobe University Kobe University Korea University Korea University Korea University Korea University Korea University Korea University Korea University Korea University Korea University Korea University Korea University Korea University Korea University Korea University Nagoya Institute of Technology Nagoya Institute of Technology Nagoya University Nagoya University Nagoya University Nagoya University Nagoya University Nagoya University Nagoya University Nagoya University Nagoya University Nagoya University Nagoya University Nagoya University Nagoya University Nagoya University Nagoya University The Ohio State University The Ohio State University The Ohio State University The Ohio State University The Ohio State University The Ohio State University The Ohio State University The Ohio State University The Ohio State University The Ohio State University Okayama University Okayama University University of Oklahoma University of Oklahoma University of Oklahoma University of Oklahoma Osaka City University Osaka City University Osaka City University Osaka City University Osaka City University Osaka City University Osaka City University Science Education Institute of Osaka Prefecture Science Education Institute of Osaka Prefecture Toho University Toho University Toho University Toho University Toho University Utsunomiya University Utsunomiya University Utsunomiya University Wonkwang University Wonkwang University

出版者

Published for the Research Institute for Fundamental Physics by Physical Society of Japan

雑誌

Progress of theoretical physics = Progress of theoretical physics (ISSN:0033068X)

巻号頁・発行日

vol.89, no.3, pp.679-696, 1993-03-25

被引用文献数

3

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We report on the characteristics of 9 bb^^- pair events produced by a 600 GeV/c π^- beam and detected in the hybrid emulsion spectrometer of Fermilab experiment E653. The measured lifetimes for samples of 12 neutral and 6 charged beauty hadrons are τ_<b^0>=0.81^<+0.34+0.08'>_<-0.22-0.02> ps, and τ_<b^±>=3.84^<+2.73+0.80>_<-1.36-0.16> ps.