1988年, 第10卷, 第4期　
刊出日期：1988-12-15

  

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  ELECTRODYNAMICS OF A QUASI-(1+1)DIMENSIONAL ELECTRON GAS

  胡嗣柱, 蔡圣善, 朱耘, 周世勋

  理论物理通讯. 1988, 10(4): 375-386.

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  A hydrodynamic model. is used to study the electrodynamics of a quasi-(1+1)-dimensional electron gas arranged in a periodic array and neutralized by rigid inert positive background The theory is applied to discuss a new model of quasi-(1+1)-dimensional electron gas with a complex unit cell and an analytical expression of the dispersion relation for this system is derived. The results are the same as. those der-ived caith the semi-classical theory dealing with collective excitations.
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  THREE-DIMENSIONAL POTENTIAL SURFACES FOR BRIDGED MIXED-VALENCE DIMERS

  彭景翠

  理论物理通讯. 1988, 10(4): 387-395.

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  A three-site model for bridged mixed-valence dimers was further developed in this paper.For the Creutz-Taube ion,the complex is delocalized with strong metal-bridge coupling.For deloca-lized complexes,we introduced a new set of bases (b,n,a) and derived a set of simpler, analytical expressions of three-dimens-onal potential sur-faces U_b,U_n and U_a by using the second-orderperturbation theory.The information of the absorption spectrum may be obtained directly from the potential surfaces.
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  THE CORRELATION AND RELAXATION OF A MULTIDIMENSIONAL SYSTEM DRIVEN BY QUADRATIC NOISE

  王辉先, 曹力, 吴大进

  理论物理通讯. 1988, 10(4): 397-411.

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  We discuss a multidimensional system driven by a non-Markovian quadratic a}oise.Using the MSR formalism and Novikov theorem, we derive approximately a lot of moments equations,the correlation functions and the relaxation times. As an illustration of our results we make con- Crete calculations for a Brownian bound oscillator system and for a liquid crystal model.
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  THE DYNAMICAL U(15/30)SUPERSYMMETRIES IN NUCLEI AND ITS SU(3)LIMIT

  沈洪清, 顾柏平

  理论物理通讯. 1988, 10(4): 413-423.

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  In this paper, g-boson is introduced into the interacting boson-fermion model (IBFM) of nuclei,and the single fermion is supposed to occupy 5 single-particle orbits with the angular j=1/2.3/2.5/2,7/2,9/2 individually.we find that there exist dynamical U(15/30) supersymmetries in nerclei. First the supersymmetry U(15/30) and its group chains obtained by its reduction to Spin (3) are studied and then two SU(3) limits are discussed in detail. Finally the two SU(3) limits are applied to nuclei ²³⁵₉₂U₁₄₃ and ¹⁸⁵₇₄W₁₁₁ respectively, the results are quite good.
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  THE SYMMETRIC STRUCTURE OF EXCITED STATES OF ¹³_ΛC AND INVESTIGATIONS OF THE ANGULAR DISTRIBUTIONS OF ¹³C(K^-,π^-)¹³_ΛC^*

  张奕定, 张宗烨

  理论物理通讯. 1988, 10(4): 425-436.

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  Based on the meth SU₃ × SU₂ supermultiplet classification,we studied the symmetric compon-ents of 10.4 and 16.4 MeV configuration of the ¹³_ΛC hypernucleus by calculating the hypernucleus by calculating the angular distribution of ¹³C(K^-,π^-)¹³_ΛC^* in the framework of DWIA, and analysed the effects of varying the parameters on the angular distributions.
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  THE Λ-Λ INTERACTION AND THE STRUCTURE OF THE Λ HYPERNUCLEI ΛΛ⁶ HE AND Λ⁹ BE

  惠维刚, 庄斐, 金星南

  理论物理通讯. 1988, 10(4): 437-443.

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  In this paper, sae found a form of Λ-Λ interaction which gives the correct binding energy of double Λ's in ΛΛ⁶He. The energy contours and density distributions of the hypernuclei ΛΛ⁶He and Λ⁹Be are given.
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  ANALYTICAL CALCULATIONS OF LARGE WILSON LOOP AVERAGES IN THE ABELIAN LATTICE GAUGE THEORIES

  薛社生

  理论物理通讯. 1988, 10(4): 445-467.

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  Using Schwinger-Dyson equations for large Wilson loop in Abelian lattice gauge theories, we evaluate the vacuum expectation values of the Wilson loop of size 1×2,2×2,2×3,and so on,from which string tension is extracted.
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  ELECTROSTATIC WAVE EXCITATION BY LITHIUM ION BEAM IN UPSTREAM RECION OF AMPTE LITHIUM RELEASES

  石秉仁, 吴京生

  理论物理通讯. 1988, 10(4): 469-483.

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  It is shown that the electron cyclotron harmonic waves and the ion acoustic broad band obsefved in the transition region and the upstream region of the two AMPTE lithium releases can be explained ,by the interaction of the lithium ion beams and the solar wind plasmas.The cycloidal motion of the freshly produced lithium ion in the solaz wind magnetic and electric fields is essential for these wave excitations.Two simplified models in ion velocity distribution are used in the dispersion relation analysis,one is an orientating ion beam, the other is an ion beam ring (the hollow beam).It is shown that the electron cyclotron. harmonics can be effectively excited by both of these beams if they are very cold. Satisfactory consistence of the theory with the observed results is obtained for the harmonic excitations.The strong Iow frequency (much less than the electron cyclotron frequency) noices might be multioriginal.It is also proposed that the interaction of the lithium ion beam and the solar wind protons provides a suitable mechanism for exciting these broad bands.
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  SYNERGETIC EFFECTS OF LHCD AND ECCD IN TOKAMAK PLASMA

  曹旭东, 王中天

  理论物理通讯. 1988, 10(4): 485-489.

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  Green function method is developed including LH waves just Like electric field. Ordinary and extraordinary electron cyclotron waves are in-jected into an LH-generated plasma respectively.Ray tracing technique is employed.The synergetic effects are significant in comparison with ECCD alone.Trapped particles are also taken into account,which reduce the generated current,especially, when the injection is from low field side.