期刊：
Nuclear Science and Engineering,2004年147(1):63-72 ISSN：0029-5639
通讯作者：
Fan, S
作者机构：
[Fan, S] Inst Atom Energy, Beijing 102413, Peoples R China.;Shanghai Univ, Shanghai Appl Radiat Inst, Shanghai 201800, Peoples R China.;Hunan City Univ, Dept Phys, Yiyang 413049, Peoples R China.;N China Elect Power Univ, Beijing 102206, Peoples R China.;NW Univ Xian, Dept Phys, Xian 710006, Peoples R China.
通讯机构：
[Fan, S] I;Inst Atom Energy, Beijing 102413, Peoples R China.
摘要：
To simplify the calculation, some assumptions are considered in the current work. The preequilibrium emission in the first step in the equilibrium process, which is characterized by exciton n = 3 and "never come back, " is considered in the preequilibrium emission process; the alpha emission is only completed with the neutron and proton emission, and the second particle emission is neglected. Under those assumptions, a semiempirical systematics of the cross section for the (n, a) reaction is obtained on the basis of the evaporation and exciton models for the energies ranging up to 20 Me V Within the nuclide mass region of 23 less than or equal to A < 209, a strong dependence on (N - Z + 1)/A and the incident neutron has been observed. The predictions of the semiempirical systematics with the global parameter of the excitation functions for the (n,alpha) reaction are in good agreement with the experimental data.
摘要：
We introduce a purely anharmonic lattice model with specific double-well on-site potential, which admits traveling compacton-like solitary wave solutions by the inverse method with the help of Mathematica. By properly choosing the shape of the solitary wave solution of the system, we can calculate the parameters of the specific on-site potential. We also found that the localization of the compacton is related to the nonlinear coupling parameter Cnl and the potential parameter V0 of the on-site potential, and the velocity of the propagation of the compacton is determined by the localization parameter q and the potential parameter V0. Numerical calculation results demonstrate that the narrow compacton is unstable while the wide compacton is stable when they move along the lattice chain.
作者机构：
[Xia, QL] Cent S Univ, Sch Phys Sci & Technol, Changsha 410083, Peoples R China.;Hunan City Univ, Dept Phys & Elect Sci, Yiyang 413049, Peoples R China.
通讯机构：
[Xia, QL] C;Cent S Univ, Sch Phys Sci & Technol, Changsha 410083, Peoples R China.
关键词：
非线性克莱茵-高登方程;类结致密子;非简谐格子;对称势
摘要：
We study the moving compacton-like kink in the system of a purely anharmonic lattice with symmetric onsite potential by a direct algebraic method. It is found that the localization of the compactons is related to the nonlinear coupling parameter Cnl and the potential barrier height V0 of the double well potential, and the velocity of the propagation of the compacton is determined by the localization parameter q and the potential barrier height V0. Numerical calculation results demonstrate that the compacton is stable when it moves along the lattice chain.
作者机构：
Hunan City Univ, Dept Phys, Yiyang 413049, Peoples R China.;Hunan Normal Univ, Dept Phys, Changsha 410081, Peoples R China.;Hunan Normal Univ, Inst Nonlinear Phys, Changsha 410081, Peoples R China.;[Jiaren Y.; Guanghui Z.] Physics Department, Institute of Nonlinear Physics, Hunan Normal University, Changsha 410081, China;[Liuxian P.] Department of Physics, Hunan City University, Yiyang 413049, China
通讯机构：
[Liuxian, P.] D;Department of Physics, Hunan City University, China
关键词：
KdV-MKdV equation;soliton;perturbation
摘要：
The authors develop a direct approach to the soliton perturbation based on the separation of variables. With the aid of approach, the first-order effects of perturbation on a KdV-MKdV soliton are derived, both the slow time-dependence of the soliton parameters and the first-order correction are obtained.
摘要：
We have obtained the parameter-phase diagram, which unambiguously defines the parameter region for the use of InAs/GaAs quantum dot as two-level quantum system in quantum computation in the framework of the effective-mass envelope function theory. Moreover, static electric field is found to efficiently prolong decoherence time. As a result, decoherence time may reach the order of magnitude of milli-seconds as external static electric field goes beyond 20 kV/cm if only vacuum fluctuation is taken as the main source for decoherence. Our calculated results are useful for guiding the solid-state implementation of quantum computing.
关键词：
Coupled MKdV equation;Coupled KdV equations;Exact solutions;Trigonometric function transform method
摘要：
In this Letter, more exact solutions for a new coupled MKdV equations are obtained by using a direct and efficient trigonometric function transform method based on the idea of the homogeneous balance method. The corresponding exact Solutions for a coupled KdV equations are obtained by Miura transformation, with the aid of Mathematica. (C) 2002 Elsevier Science B.V. All rights reserved.
摘要：
More new exact solutions for a class of nonlinear coupled differential equations are obtained by using a direct and efficient trigonometric function transform method based on the idea of the homogeneous balance method. (C) 2002 Elsevier Science B.V. All rights reserved.
作者机构：
[Pan, LX] Hunan Normal Univ, Dept Phys, Changsha 410081, Peoples R China.;Hunan Normal Univ, Inst Nonlinear Phys, Changsha 410081, Peoples R China.;Yiyang Teachers Coll, Dept Phys, Yiyang 413049, Hunan Province, Peoples R China.;China Ctr S Univ, Dept Appl Phys, Changsha 410083, Peoples R China.
通讯机构：
[Pan, LX] H;Hunan Normal Univ, Dept Phys, Changsha 410081, Peoples R China.
关键词：
diamond-structure lattice;nonlinear gap modes;quasi-contimuum approximation
摘要：
We analytically study the nonlinear localized gap modes in a one-dimensional atomic chain with uniform atomic mass but two periodically alternating force constants between the nearest neighbors by means of a quasi-continuum approximation. This model simulates a row of atoms in the (111) direction of a diamond-structure type of crystals or molecular crystals with alternating double and single bonds. For this lattice system, rye find that the harmonic plus quartic anharmonic terms of inter-site potential produce a new type of nonlinear localized gap modes with a slightly asymmetry distribution of atomic displacements. These localized gap modes are somewhat different from widely studied localized gap modes with a symmetry atomic displacement distribution in diatomic ion lattices.
摘要：
We report on the theoretical study of the interaction of the quantum dot (QD) exciton with the photon waveguide models in a semiconductor microcavity. The InAs/GaAs self-assembled QD exciton energies are calculated in a microcavity. The calculated results reveal that the electromagnetic field reduces the exciton energies in a semiconductor microcavity. The effect of the electromagnetic field decreases as the radius of the QD increases. Our calculated results are useful for designing and fabricating photoelectron devices.
作者机构：
[Zhou, GH] Hunan Normal Univ, Dept Phys, Changsha 410081, Peoples R China.;Yiyang Teachers Coll, Dept Phys, Yiyang 413049, Peoples R China.;Chinese Acad Sci, Int Ctr Mat Phys, Shenyang 110015, Peoples R China.
通讯机构：
[Zhou, GH] H;Hunan Normal Univ, Dept Phys, Changsha 410081, Peoples R China.
摘要：
We numerically study the intrinsic localized vibrational modes in a diatomic chain with different masses and alternating force constants between nearest neighbors. This model simulates a row of atoms in the [111] direction of sphalerite-structure crystal. We found that the harmonic and quartic anharmonic terms in the nearest-neighbor interaction potential produce the intrinsic localized modes with frequencies above the optical branch or in the gap of the linear spectrum, the distribution patterns of atom amplitudes are asymmetry with a form of quasi-even or quasi-odd-parity, and the inclusion of cubic term in the potential lowers the frequencies of the modes and introduces static displacements for the atoms.
作者机构：
[Hai, WH] Hunan Normal Univ, Dept Phys, Changsha 410081, Peoples R China.;Chinese Acad Sci, Wuhan Inst Phys & Math, Lab Magnet Resonance & Atom & Mol Phys, Wuhan 430071, Peoples R China.;Yiyang Teachers Coll, Dept Phys, Yiyang 413049, Hunan Province, Peoples R China.
通讯机构：
[Hai, WH] H;Hunan Normal Univ, Dept Phys, Changsha 410081, Peoples R China.
关键词：
Josephson effect;control;chaos;stability
摘要：
The models of rf-driven Josephson junctions are investigated as the perturbed systems. It is shown that the heteroclinic orbits corrected by perturbations are stable if some relations between the initial constants and system parameters are satisfied, which leads to Melnikov chaos: To stabilize chaos one has to make the control parameters fitting the relations. The result is compared with the previous numerical work and a good agreement is found.
摘要：
Based on not only the ideas of phenomenological investigations about the internal friction of crystalline materials but also the studies on the internal friction laws of noncrystalline materials during structural relaxation processes in recent years, the method of making relaxation cell is put out. In the method, traditional mechanics parameter model and two-level model are unified, so phenomenological studies on the internal friction of noncrystalline materials during structural relaxation processes are made and a new relaxation law is formed.
期刊：
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE,1994年142(2):K59-K64 ISSN：1862-6300
通讯作者：
SHUI, JP
作者机构：
[CHIAO, CL; SHUI, JP] YIYANG TEACHERS COLL,DEPT PHYS,YIYANG 413049,PEOPLES R CHINA.;[SHUI, JP] ACAD SINICA,INST SOLID STATE PHYS,INTERNAL FRICT & DEFECTS SOLIDS LAB,HEFEI 230031,PEOPLES R CHINA.
通讯机构：
[SHUI, JP] A;ACAD SINICA,INST SOLID STATE PHYS,INTERNAL FRICT & DEFECTS SOLIDS LAB,HEFEI 230031,PEOPLES R CHINA.
摘要：
Information concerning the effect of pre-heat treatments upon the internal friction behaviour of amorphous palladium silicon alloys during multiple isothermal annealing at different or same temperatures was presented. The reversible behaviour of structural relaxation was observed experimentally.
