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25 March 1999, Volume 16 Issue 2 Previous Issue    Next Issue

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The fast calculation of free surface wave green function and its derivatives Zhou Qingbiao, Zhang Gang, Zhu Lingsheng 1999, 16(2): 113-120.  Abstract ( )   PDF (296KB) ( )   Fast evaluation of frequency domain free surface Green Function with sufficient accuracy is the key of frequency domain approach for solving hydrodynamic problems.In this paper,the fast caculation of free surface Green Function and its derivatives (frequency domain,infinite depth) is investigated and discussed.This approach is shown to be applicable and efficient.

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A variational iteration method to duffing equation He Jihuan 1999, 16(2): 121-127.  Abstract ( )   PDF (245KB) ( )   The forced oscillation of Duffing equation is studied by a variational iteration method. As a result, a uniformly valid asymptotic approximation in the entire region (0 < ε < ∞) is obtained, the maximal relative error of the period obtained is less than 5.66%, and the obtained primary resonance and superharmonic resonances are also uniformly valid in the entire region.

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Phonon dispersion and surface relaxation for fcc metals: an analytical embedded atom potential calculations Cai Jun, Liu Shaojun, Ye Yiying, Wang Renhui 1999, 16(2): 128-134.  Abstract ( )   PDF (306KB) ( )   A simple analytical embedded atom potential model is developed.The potential is used to calculate phonon dispersions,surface energies,surface relaxation,structure stability,and total energy curve of fcc metals:Al,Ag,Au,Cu,Ni,Pt,Pd.The results are in agreement with the experiments or the first principle calculations.In additions,compared with the previous non analytical potentials,this simple analytical form can make calculations more convenient and more efficient.

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The calculation for pendant drop used in monoloyer film Pu Xiaoyun, Wan Jun, Liu Qingju, Zhang Zhongmin, Lin Lizhong 1999, 16(2): 135-140.  Abstract ( )   PDF (283KB) ( )   The globe model for studying pendant drop in monolayer film has been established.Based on this model,the distributions are calculated for dipole intensity of fluorescent surfactant molecules,for surfactant molecular density and for fluorescent intensity along the observed direction.The calculation results are discussed and compared with the experiment on Octadecyl Rhodamine B(ODRB) molecules.

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The application of solid crystallization=process in optimization algorithm Lu Wei, Tao Fengxiang, Mu Yaoming, Chen Xiaoshuang, Li Ning, Liu Xingquan, Liu Jingjiao, Shen Xuechu, Lu Hong 1999, 16(2): 141-144.  Abstract ( )   PDF (164KB) ( )   It investigates the application of solid crystallization process in the optimization algorithm.A special way is also proposed for the parameter "stirring" for the target function to get minimum value of the target function in the whole parameters' region.Meanwhile,the optimization algorithm is independent on the initial value of parameters without the larger calculation time.

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Numerical studies on the model of the energy transport in protein induced by exciton exciton interaction Huang Yanzhao, Zhang Wen, Xiao Yi 1999, 16(2): 145-150.  Abstract ( )   PDF (384KB) ( )   A model is proposed to study numerically the dynamics for the energy transportion of amide Ⅰ vibrations in proteins.The results show that there exists static and moving localized models in the mode and thus it may provides alternative mechanism of the energy transport in protein molecules.

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Application of mapping invariant distribution to calculating measure theoretic entropy Xu Jianxue 1999, 16(2): 151-156.  Abstract ( )   PDF (233KB) ( )   An improvement of constituting Markov partition is proposed for calculating measure theoretic entropy by computing invariant distribution of nonlinear mapping instead assuming equal likelihood for all points over a interval; and the formulations and the iteration forms of invariant distribution of logistic map are derived.It is shown that the better result can be obtained through several iterations and the amount of computation is not larger.

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The calculation of sgemp response in various ranges of x ray fluence Zhou Hui, Li Baozhong, Wang Lijun, Chen Yusheng 1999, 16(2): 157-161.  Abstract ( )   PDF (237KB) ( )   The System generated electromagnetic pulse (SGEMP) generated by X rays in various ranges of fluence have been numerically studied.Certain trends about the electric and magnetic field and their distribution as a function of fluence are abtained and discussed.

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Numerical simulation of indirectly driven high convergence implosions Fu Shangwu, Huang Shuke, Li Yunsheng 1999, 16(2): 162-166.  Abstract ( )   PDF (211KB) ( )   The indirectly driven high convergence implosions is numerically simulated using 2D Lagrangian code named Lared Ⅰ.These implosions were characterized by a variety of measurements,and computer models are in good agreement with the measurements.

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Application of rkdg in solution of n-s equation Su Mingde, Zhang Jingming 1999, 16(2): 167-176.  Abstract ( )   PDF (388KB) ( )   The RKDG method, proposed by Cockburn & Shu (1988), is developed into solution of N-S equation, and the results are compared with exact solution of Burger equation with viscousity. The result of 2D problem has been also compared with the one obtained by solving Euler equation.

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Study of nuclear safety parameters of uranium zirconium hydride pulsed research reactor core Chen Wei, Jiang Xinbiao, Xie Zhongsheng, Chen Da 1999, 16(2): 177-182.  Abstract ( )   PDF (239KB) ( )   By using lattice calculation code WIMS-D/4,hexagonal nodal diffusion code SIXTUS and the WIMS-N1/N2 library which include the data of the nuclide H in ZrH,Er-166 and Er-167,nuclear safety parameters are analyzed of uranium zirconium hydride pulsed reactor core,power peaking factor and fuel temperature coefficient.

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Numerical simulation of implanted electrons transport in the materials Zhang Chunlin, Wu Keyong, Hu Cuiying 1999, 16(2): 183-191.  Abstract ( )   PDF (354KB) ( )   Based on the model of the electron beam irradiating the matter having only single kind of atom and the elctron multiply scattering theory,this paper has constructed a scattering unit model mirroring the structure of the amprphous materials which have the characteristic of short range order but long range disorder.The electron energy loss distributions are calculated by means of Monte Carlo simulation and transport equation in the scattering unit model.In addition,the structure property of materials including several kinds of atoms are took into account.The calculatd results are given and discussed.

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Simulation of the fp jte planar junction termination with a boundary element method Wu Zilu, Luo Jinsheng 1999, 16(2): 192-198.  Abstract ( )   PDF (284KB) ( )   A 2-D boundary element method is introduced for the simulation of high-voltage Junction termination.With the concept of critical electric field,this method does not need to perform ionization integral.The effect of interface charge to the breakdown voltage of FP-JTE junction termination has been analyzed.The result shows that the breakdown voltage almost linearly depends on the density of interface charge,and the field plate can suppress the breakdown voltage sensitivity to interface charge.

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An artificial scattering iteration method for calculating multigroup radiation transfer problems Feng Tinggui, Lai Dongxian, Xu Yan 1999, 16(2): 199-205.  Abstract ( )   PDF (275KB) ( )   Some difficulties are analyzed for solving problems of multigroup radiation transfer coupled with material,and an artificial-scattering iteration method is presented by splitting electron energy equation into two equations.The computing method is described and compared with other method.Numerical examples are given.

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Self memorial model of climate prediction and its preliminary application Cao Hongxing, Feng Guolin, Wei Fengying, Gao Xiang 1999, 16(2): 206-210.  Abstract ( )   PDF (216KB) ( )   By virtue of non adiabatic thermodynamic and the moisture balance equations of the atmosphere, a mathematical model is presented for the short range climate, which is composed of difference-integration equations with variables: surface temperature, precipitation and height at 500 hPa, on the basis of the self-memorization principle of the atmosphere. The memorial coefficients in the model are estimated by utilizing the meteorological data in summer (June, July, August)in 1951 to 1985. This model was used to give the hindcasts of the temperature and precipitation in summer for the lead time 1986 to 1992.

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Line method with high order accuracy for convection-dominated diffusion equations Wu Xionghua, Tan Zhihai 1999, 16(2): 211-216.  Abstract ( )   PDF (204KB) ( )   The line method with high order accuracy for a kind of one dimension convection_diffusion equations is presented by discretizing locally partial differential equations (PDE), which is based on the high order accurate solver-SEV ORD for ordinary differential equations (ODE) with boundary value problems. By using local one dimension method, the alternate direction line algorithm with high order accuracy is given for two dimension convection_diffusion problems.

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Spectral method for the flow between two concentric rotating spheres Cai Jiangang, Huang Aixiang 1999, 16(2): 217-224.  Abstract ( )   PDF (319KB) ( )   Viscous incompressble flow between two concentric rotating spheres is simulated numerically by the spectral Galerkin method,in which the eigenfunctions of Stokes operator are used as basis functions.Model systems similiar to Lorenz's system are presented.The existence of attractor and the stability of model systems are obtained.