1988年, 第10卷, 第3期　
刊出日期：1988-10-30

  

• 全选
  |

• Select
  FROM THREE-TORUS TO FRACTAL AND THEN TO CHAOS

  邹健, 胡岗

  理论物理通讯. 1988, 10(3): 251-259.

  摘要 ( ) PDF全文 ( )   可视化   收藏

  We use numerical methods to study the model x(n+l)=λx(n) (x(n)-1)+ef(θ(n),φ(n)),θ(n+1)=θ(n)+A, φ(n+1)=φ(n)+B. As e is small, we get doubled three-tori. Increasing e the tori become fractal three-tori, the dimension is not integer, while the trajectory does not diverge exponentially. Finally it changes into chaos. The critical parameter values.for chaos are approximately calculated. So one of the roads from three-tori to chaos is three-tqri→fractal three-tori (not chaos)→chaos.
• Select
  AN APPROACH TO RAYLEIGH MODEL OF EFFECTIVE CONDUCTIVITY TENSOR OF COMPOSITE

  顾国庆, 陶瑞宝

  理论物理通讯. 1988, 10(3): 261-268.

  摘要 ( ) PDF全文 ( )   可视化   收藏

  Using a new approach to Rayleigh model of composite, we obtain the complete solutions for many systems of orthorhombic., The evaluation of the effective conductivity tensor of the composite with anisotropic,structure,is also discussed in detail for the first time.
• Select
  THERMOSTIMULATED CONDUCTIVITY IN AMORPHOUS SEMICONDUCTORS WITH NON-EXPONENTIAL DENSITY OF LOCALIZED STATES

  许政一, 杨华光, 顾本源

  理论物理通讯. 1988, 10(3): 269-274.

  摘要 ( ) PDF全文 ( )   可视化   收藏

  We calculate the thermostimulated conductivity(TSC) in amorphous semiconductors with non-exponential density of Iocali:zed states (DOS) that has been obtained from the measurements of the field-effect by Weisfield et al .The calculated results are compared with the case of exponential density of localized states .It turns out that the low-T-peak in the TSC becomes higher than the high-T-peak when the non-exponential DOw is rapidly increased in the high energy region.Except for this point, the profile of TSC in these two cases does not exhibit substantial difference, but the results are quanfitatwely different.
• Select
  THE OCCUPATION FUNCTION OF LOCALIZED STATES IN AMORPHOUS SEMICONDUCTORS CALCULATED FROM THE ENTI RE TRANSIENT PHOTOCURRENT SPECTRA

  顾本源

  理论物理通讯. 1988, 10(3): 275-280.

  摘要 ( ) PDF全文 ( )   可视化   收藏

  The occupation function of localized states in amorphous semiconductors is calculated from the entire transient photocurrent spectra. We find that the occupation function does not exhibit any abrupt change for the observation time shorter and longer than the monoqlecular recombination lifetime τ_MR. This result is opposed to previous conclusion. Our'result is independent of the specific shape of. the density of localized states.
• Select
  INFLUENCE OF THE TEMPERATURE-DEPENDENCE OF RECOMBINATION LIFE-TIME OF FREE CARRIERS IN AMORPHOUS SEMICONDUCTORS ON THERMOSTIMULATED PHOTOCURRENT SPECTRA

  许政一, 顾本源, 董碧珍, 朱美芳

  理论物理通讯. 1988, 10(3): 281-289.

  摘要 ( ) PDF全文 ( )   可视化   收藏

  In previous theoretical analysis of ther-mostimulated conductivity (TSC) in amorphous semiconductors, for the sake of simplicity, we assumed that the recombination life-time τ of free carriers is a constant independent of temperature. In fact, this assumption is incomplete. The influence of the temperature-dependence of T on thermostimulated conductivity spectra is investigated in the present work. Under the consideration of T-dependence of τ, all the characteristic of TSC spectra indicated by the previous theoretical analysis still remain valid qualitatively, but the quantitative results are considerably changed. The effect of the relaxation parameters describing the behavior of τ(T) on the CSC spectra is also discussed.
• Select
  TIME-DEPENDENT SOLUTION OF FOKKER-PLANCK EQUATION FOR N DEGREES OF FREEDOM AND DYNAMICAL THRESHOLD FOR COMPOUND NUCLEUS FORMATION IN SYMMETRIC HEAVY ION REACTION

  王书暖, H. A. Weidenmuller

  理论物理通讯. 1988, 10(3): 291-302.

  摘要 ( ) PDF全文 ( )   可视化   收藏

  We generalized the time-dependent solution of the Fokker-Planck equation to n degrees of freedom.Using the solution we calculated the extra push energy ΔE from the view of Brownian motion as a diffusion process over a saddle point, which is caused by overcoming both repulsive Coulomb and dissipative forces to form a compound nucleus.It depends on the initial condition and the friction, other degrees of freedom acting as a heat bath of temperature T and causing thermal fluctuations.
• Select
  BARYON-MESON VERTEX STRUCTURE OF THE SYSTEM INCLUDING S QUARK

  余友文

  理论物理通讯. 1988, 10(3): 303-320.

  摘要 ( ) PDF全文 ( )   可视化   收藏

  Baryon-meson vertex structure of the system including s quark was studied from one-gluon- exchange quark-antiquark pair creation model. The theoretical coupling constants are in good agreement with the experimental data except for the cases including π meson, in which the theoretical results are not large enough in comparison with the measured values.
• Select
  ON THE SHORT RANGE INTERACTIONS AMONG SKYRMIONS

  何汉新, 曹林

  理论物理通讯. 1988, 10(3): 321-328.

  摘要 ( ) PDF全文 ( )   可视化   收藏

  A determination of the short range characteristics for the two-body and many-body interac-tions among Skyrmions is given, The effects of quantization is shown for the two-body interaction and the results are compared with those in the sixquark model.The sensitivity with respect to the pion mass is shown.
• Select
  SHORT RANGE N-N INTERACTION IN THE CHIRAL BAG MODEL

  杨新华

  理论物理通讯. 1988, 10(3): 329-337.

  摘要 ( ) PDF全文 ( )   可视化   收藏

  Using the chiral bag model a quark theory of N-N interaction is formulated. In terms of the Green's functions of quark, gluon and Goldstone boson('pion')fields in the model,the effective nuclear potentials have been calculated for the different (TS) channels.There is a repulsive core in the potentials.The strength is about several hundreds MeV.About one fourth of the repulsion is due to 'pion' exchange.
• Select
  A DESCRIPTION OF π⁺-π^- AND NUCLEON-ANTINUCLEON POTENTIALS DUE TO THE ANNIHILATION OF ONE GLUON

  刘波, 姜焕清, 潘玲君

  理论物理通讯. 1988, 10(3): 339-345.

  摘要 ( ) PDF全文 ( )   可视化   收藏

  We give a description of the short-range parts of π⁺-π^- and nucleon-antinucleon potentials by using the mechanism of annihilation annihilation of one gluon into the intermediate states.An attrac-tive contribution is found.
• Select
  SOME GEOMETRIC PROPERTIES OF STRINGS

  沈建民

  理论物理通讯. 1988, 10(3): 347-355.

  摘要 ( ) PDF全文 ( )   可视化   收藏

  Some local and global properties for the world sheet of string are discussed.The structural equations of closed surfaces imbedding in Rn are deduced by making use of moving coordinate frame.It is shown that for the case of constant curvature the Lionville theory, closely relates to the conformal field theory.
• Select
  MIGDAL SCHEME FOR THE EFFECTIVE COUPLINGS OF POLYAKOV LOOPS

  徐在新, 朱本源

  理论物理通讯. 1988, 10(3): 357-362.

  摘要 ( ) PDF全文 ( )   可视化   收藏

  The Migdal renormalization group(MRG) procedure is applied to the finite temperature SU(2) lattice gauge theory.With its effective action form in terms of the Polyakov Zoop we an-alyse the strong and weak coupling approximations of the evolution of renormalized couplings.The distribution of renormalization group trajectory is obtained and the critical coupling is measured.
• Select
  SOME REPRESENTATIONS FOR TIME-DEPENDENT HARMONIC OSCILLATOR

  范洪义, 井思聪

  理论物理通讯. 1988, 10(3): 363-369.

  摘要 ( ) PDF全文 ( )   可视化   收藏

  In terms of the IWOP (integration within ordered product) technique, we construct squeezed state formulatiion for the time-dependent harmonic oscillator.The formulation is based on the Lewis-Riesenfeld quantum theory.Some other representations are also found with the same technique.
• Select
  ENERGY LEVELS OF NUCLEI USING BOGOLIUBOV-VALATIN:TRANSFORMATIONS FOR THREE PARTICLE: INTERACTION

  Saifuddin

  理论物理通讯. 1988, 10(3): 371-373.

  摘要 ( ) PDF全文 ( )   可视化   收藏

  The calculation of energy Levels of nuclei in the presence of three-particle interaction is very involved.But using the Bogoliubov-Valatin transformations this calculation is considerably simplified.