1986年, 第5卷, 第3期　
刊出日期：1986-04-30

  

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  THE DIELECTRIC FUNCTION OF AN ELECTRON GAS IN A PERIODIC STRUCTURE: RPA THEORY

  薛登平, 卢德馨, 蔡建华

  理论物理通讯. 1986, 5(3): 187-193.

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  The dielectric function of a classical electron gas in a periodic superlattice structure is calculated within the linear response regime undel RPA and the assumption that the equilibrium density of electrons differs slightly from its average value.Numerical results are given for the plasmon dispersion and the longitudinal dielectric function in the case of sinusoidally modulated suprlattice structure.
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  RANDOM WALK WITH QUATERNION TRANSFER PROBABILITY Of A BCC LATTICE

  R. Conte, 符洪, 郝柏林

  理论物理通讯. 1986, 5(3): 195-211.

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  We present the exact solution of a random walk problem with quaternion transfer probability on a 3-dimensional "anisotropic" body centered cubic lattice.It provides a closed-form approximation for the 3-dimensional Ising model on a bcc lattice.
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  THE HEDGEHOG SCLUTICN OF CHIRAL BAG

  靳学敏, 马中玉, 卓益忠

  理论物理通讯. 1986, 5(3): 213-224.

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  The hedgehog shape is assumed to have the spherically symmetric solutions both for linear and nonlinear hybrid bag models in the zero-loop approximation.The hedgehog solu-tions are obtained for all versions of the chiral bag.The variations of the energy with the bag radius are discussed.
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  REPULSIVE CORE STRENGTH OF THE NUCLEON-NUCLEON INTERACTION

  钟毓澎, 杨新华, 程檀生

  理论物理通讯. 1986, 5(3): 225-233.

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  The contributions to the repulsive corestrength of the N-N force from both the quarkpion and quark-gluon interactions in the Chiral(or Cloudy) Bag Model are calculated. These contributions are about several hundred MeV,a great part of which comes from the quark-pion interactions. It is found that when self-energies due to both gluon and pion exchange are considered,the contribution from the self-energy due to pion exchang is more important than that from the direct and exchange energy of guarkpion interactions.
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  THE CROSS-FIELD STREAMING INSTABILITY WITH ANISOTROPIC TEMPERATURE

  王中天, 赵怀国

  理论物理通讯. 1986, 5(3): 235-242.

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  A general dispersion relation is derived.for the plasma with unmaqnetized ions and magnetized electrons with anisotropic temperature.Numerical results are presented for the case in which the relative electron-ion cross-field velocity exceeds greatly the Alfven speed of the plasma.The threshold of the instability becomes lower when the ratio of the parallel electron temperature to the perpendicular one increases slightly about unity.The peak growth rates can be considerably larger for the anisotropic temperature.
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  COLLISIONAL EFFECTS IN CLOUD-IN-CELL SCHEME

  张家泰, 刘成海, 梁华湘, 余淑珍, 张书贵, 许林宝

  理论物理通讯. 1986, 5(3): 243-252.

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  In this paper, a physical model and numerical method in cloud-in-cell(C1C) scheme for simulation of weak collisional effects are proposed.Collisions are introduced at reconstruction time in terms of a one-dimensional Fokker-Planck operator., The friction term of the collision,operator is equivalent to the introduction of a velocity-dependent acceleration a(u)=-uy(u) into the equation of motion of the particles. The diffusion term is represented by finite differences over the nonuniform velocity grid. Col lisional relaxation of two Maxwellian beams is studied.The numerical results are in good agreement. with the analgtical values.
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  RECENT DATA ON P(p)p SLOPE PARAMETER AND NATURE OF POMERON TRAJECTORY

  FAZAL-E-ALEEM, MOHAMMAD SALEEM

  理论物理通讯. 1986, 5(3): 253-258.

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  It is shown that nonlinear trajectory is not imperative to explain the behaviour of the slope parameter for p(p)p elastic scattering.The slope parameter,including the most recent data at collider energies,is explained by assuming a linear pmeron trajectory.The predictions of the mdel at √s=2,5 and 40 TeV are also given.
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  A SEMIPHENOMENOLOGICAL FORMULA FOR THE π-MESON FORM FACTOR FROM LOW TO HIGH Q²

  黄涛, 孔繁梅, 罗马

  理论物理通讯. 1986, 5(3): 259-263.

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  We present an improved semiphenomenological formula for the π-meson form factor. It synthesizes the vector dominance mosels, the frozen coupling constant and perturbative prediction from low Q² to high Q².
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  ON LOCALIZATION IN DISORDERED ELECTRON SYSTEMS

  韩福祥, 林建成, 周光召

  理论物理通讯. 1986, 5(3): 265-271.

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  The field theory of Anderson localization of disordered electron systems is formulated in the framework of closed time path Green's functions (CTPGF). The properties of the mobility edge are studied by the renormalization group method and the density of states is found to be zero at the mobility edge.
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  ANSWERS TO Mr.TON'S COMMENTS

  朱重远

  理论物理通讯. 1986, 5(3): 273-274.

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  1. The first point of Ton's comments is to say the formula(11) of my paper. 2. Tong's second comment,i.e.,"The derivation rules'of … compound functions … in general do not hold … " 3. When I write.
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  仝道荣

  理论物理通讯. 1986, 5(3): 275-279.

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  Mr.ZHU Zhong-yuan discussed the connection between Lie supergroups and Lie superalgebras in his paper entitled "On Three Theorem of Lie Supergroups and Lie Supperalgebras^[1].