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25 December 1997, Volume 14 Issue S1 Previous Issue    Next Issue

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NUMERICAL SIMULATION OF OIL-WELL PERFORATOR Hang Yihong, Chen Xianlin, Dong Zhen, Yu Zhilu, Fan Zhongbo, Geng Hunan 1997, 14(S1): 404-406.  Abstract ( )   PDF (173KB) ( )   A hybrid computational method and the corresponding software for simulating oil well perforator are described.A good agreement has been obtained between computational results and experiments.This research indicates that the software has a higher ratio of effectiveness over cost.

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SOME METHEMATICAL PROBLEMS IN COMPUTATIONAL PETROLEUM GEOLOGY Wu Shengchang, Yuan Yirang, Bai Donghua 1997, 14(S1): 407-409.  Abstract ( )   PDF (132KB) ( )   It outlines some mathematical problems in computational petroleum geology and puts forward the methods for solving them.

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A NUMERICAL INVESTIGATION OF THE STABILITY OF COMPRESSIBLE PLANE MIXING LAYERS Wang Qiang, Fu Dexun, Ma Yanwen 1997, 14(S1): 413-416.  Abstract ( )   PDF (192KB) ( )   The stability of temporally evolving compressible plane mixing layers is investigated numerically by solving the three dimensional compressible linear disturbance equations.A high order finite difference method is used.The effects of key parameters such as convective Mach number and Reynolds number on the stability characteristics of compressible mixing layers are analyzed.The comparsions between two and three dimensional,viscous and inviscid disturbances are presented.Part of the numerical results obtained here are in agreement with those of relative literature.

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NUMERICAL SIMULATION OF PHOTOCURRENT RESPONSE OF SEMICONDUCTOR DEVICES TO IONIZING RADIATION Huang Liuxing 1997, 14(S1): 417-418,416.  Abstract ( )   PDF (132KB) ( )   The description of production and transient of photocurrent in semiconductor devices in ionzinong radiation environment is of great importance for Transient Radiation Effects on Electronics Systems(TREES). Physical models of generic description of photocurrent in semiconductors are proposed hare, photocurrent of an actual pn junction has been simulated numerically, and the simulation results are also presented.

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NUMERICAL STUDY OF THERMAL INSTABILITY OF D T BURNING PLASMA Long Yongxing, Shi Bingren, Mu Zongze 1997, 14(S1): 419-420.  Abstract ( )   PDF (93KB) ( )   The strong dependence of fusion reaction rate on ion temperature leads to a thermalinstability of D T burning plasma.Mathematical qualites are discussed for the non-linear differential equations describing the steady state power balance of a D T burning plasma.Shooting method is used to obtain equilibrium solution and eigenvalue of the linearized equation about temperature pertubation around equilibrium.How ever,the solution obtained by the above method can be different from the time-dependent one for t→∞.This provides a typical example of a kind of unsolved non-linear mathematical problem.

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THEORETICAL STUDY OF X RAY LASER HOLOGRAPHY Li Jinghong, Peng Huimin, Zhang Guoping, Lei Guangyu 1997, 14(S1): 421-423.  Abstract ( )   PDF (144KB) ( )   Based on the theoretical study of spatial coherence of laboratory x-ray lasers, a principle setup is proposed for x-ray laser holography, and corresponding theoretical simulation is performed for the recording and reconstruction of the lenseless Fourier transform hologram.

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SOLUTION OF TRANSIENT HEAT CONDUCTION PROBLEM BY ONLY BOUNDARY ELEMENT METHOD Yao Shouguang 1997, 14(S1): 424-425,423.  Abstract ( )   PDF (135KB) ( )   The boundary element method involving only boundary integrals and time dependment fundamental solutions is applied to solve a two-dimensional linea transient heat conduction problem. The numerical results show a good agreement between the numerical and the analytical solutions.

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PROPAGATION OF PULSED HIGH POWER LASER GENERATED SHOCK-WAVE IN THE TARGET Cai Zongliang, Zhang Jianquan, Liu Feng, Qiang Xiwen 1997, 14(S1): 426-428.  Abstract ( )   PDF (137KB) ( )   A numerical method and an analytical method for study creation and decay of laser generated shock-wave in the target are presented on the basis of one-dimensional hydrodynamic model.The ablation presure is used as boundary condition.These methods permit the caculation of the three stages of shock-wave evolution.Three kinds of solid state material,such as Al,Cu and C/Ph are caculated.The maximum presure and shock-wave profile of each material are given out.

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A NEW NODAL GREEN'S FUNCTION METHOD FOR CYLINDRICAL GEOMETRY Hu Yongming, Zhao Xianfeng 1997, 14(S1): 429-430.  Abstract ( )   PDF (100KB) ( )   A nodal Green's function method for cylindrical geometry for multidimensional neutron diffusion calculation is developed.First,the neutron diffusion equation is converted to three coupled one-dimensional partial flux equation through transverse integration.For the radial partial flux equation,the differential term is decomposed to a diffusion term plus a modified term,which is called modified source.Therefore,the three equations show the same form as for slab geometry.Second,by way of the second kind boundary condition Green's function for slab geometry,the three equations are integrated to obtain the integral equations.For the modified source term,it can be converted to Green's function's differentiation term through partial integration.At last,the equations are solved by source iteration method.Through benchmark computation,this method shows high speed and high extent of accuracy.It is a effective method for reactor design of three dimensional cylindrical geometry and for nuclear fuel management calculation.

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NOTE ON STEP-BY-STEP NORMALIZATION CORRECTION FOR THE NORM OF WAVE FUNCTION Zhou Zhongyuan, Wu Chengxun, Ding Peizhu 1997, 14(S1): 431-432.  Abstract ( )   PDF (108KB) ( )   A simple example is computed by using R-K approach and step-by-step normalization correction.It is shown that the norm of wave function can be preserved by using this method,However,other physical quantities,such as energy of the system and population probabilities on the states,are still not reasonable,even worse.

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COMPUTING CLASSICAL TRAJECTORIES OF N2 SYSTEM BY SYMPLECTIC ALGORITHM Shi Aimin, Mu Yingkui, Ding Peizhu 1997, 14(S1): 433-434.  Abstract ( )   PDF (107KB) ( )   Classical trajectories of diatomic system N2 are calculated by means of both Symplectic and R-K algorithms.It is shown that Symplectic algorithm keeps Symplectic structure of the system and its intrinsic qualities unchanged and consistent with the theory and experiment. R-K approach is not the case.

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THE EFFECT OF GAIN ON THE PROPAGATION OF X-RAY LASER Wu Jianzhou 1997, 14(S1): 435-437.  Abstract ( )   PDF (145KB) ( )   The propagation of x-ray laser in plasma is studied on the assumption that x-ray propagates rectilinearly. In H-like C plasma, the absorption regions in gain curves don't seriously affect the propagation of x-ray laser unless there are disorder ones in the ray trajectories.

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THE APPLICATION OF NUMERICAL MODEL OF DIFFUSION OF ATMOSPHERE POLLUTION IN TWO DIMENSIONAL MOUNTAIN DISTRICT WITH THE MULTI-LEVEL METHOD Zhou Zhenzhong, Chen Lishu 1997, 14(S1): 438-439,437.  Abstract ( )   PDF (131KB) ( )   With some improvements,the model of Interior Boundary Layer in heating power of Sea wind.Can simulate not only the field of sea wind,but also the flow field of river valley.The numerical computational results are consistent with the values of observation.This paper also brings the discussion on practical application of the preconditional Conjugate Gradient Method (PCG) that is most frequantly used in Multi-level Methods to solve the linear algebra equations,which result from the numerical approximation of Interior Boundary Layer in heating power of sea wind.The Computational time has been shown reduced considenablely.

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STUDY ON THE TIME RESOLUTION CURVE OF ULTRASHORT PULSE DFWM Chen Mouzhi, Yu Li, Huang Wenda 1997, 14(S1): 440-442.  Abstract ( )   PDF (140KB) ( )   The time resolution curve (TRC) of ultrashort pulse DFWM is studied theoretically.Using Guassian shaped pulse,the time resolution curves of two types of grating are calculated respectively and their influences in measurement are discussed.

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GAUSS NUMERICAL INTEGRATION FOR SOLVING THE GENERALIZED ABEL EQUATION Mu Yingku, Wang Yi, Ding Peizhu 1997, 14(S1): 443-444,442.  Abstract ( )   PDF (134KB) ( )   Gauss numerical integration is applied to compute the radial emission coefficients in Optically-Thick,Cylindrically-Symmetric Plasmas.Using the integration,the generalized Abel equation is separated into a system of linear algebraic equations and the coefficient matrix of the system is an upper triangular matrix,so the interpolation,which has second order of accuracy,is very simple to compute and less computation time is required.

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THE STREAMLINE-MIXED FINITE ELEMENT SIMULATION FOR TWO-DIMENSIONAL IMCOMPRESSIBLE FLUID WITH ZERO-VISCOSITY Chen Huanzhen, Zhang Huaiyu 1997, 14(S1): 445-447.  Abstract ( )   PDF (165KB) ( )   Based on the stream function-vorticity expression a discrete procedure is employed to approximate the imcompressible fluid with zero viscosity,in which the vorticity is approximated by finite difference along its streamline,the velocity field and the stream function are approximated simultaneously by a mixed finite element.The analysis shows that the procedure possesses both high accuracy and good stability which are not shared by standard methods.

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THE CALCULATION OF NEMATIC ORDER IN LIQUID CRYSTALS WITH AN EXTERNAL MAGNETIC FIELD Zhang Zhidong, Shao Xibin, Huang Ximin 1997, 14(S1): 448-449,447.  Abstract ( )   PDF (133KB) ( )   The calculations of nematic order in liquid crystals with an external magnetic field are made based on the cell theory.By taking account of the molecular short range correlations,the dependences of order parameter and internal energy on magnetic strengty are in close agreement with those of the simulation.

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A BISECTION METHOD AND ITS MODIFICATION FOR SOLVING THE EIGENVALUE PROBLEM OF SYMMETRIC BAND MATRICES Luo Xiaoguang, Li Xiaomei, Chen Jianhua 1997, 14(S1): 450-452.  Abstract ( )   PDF (169KB) ( )   A bisection method is presented for solving the eigenvalue problem of symmetric band matrices.This method is especially suitable for the case where only a few eigenpairs are needed. Further more,a modified strategy is also presented.The main idea is that firstly using the bisection for some steps to obtain an approximate eigenvalue,then Rayleigh Quotient Iteration is applied to extract the eigenvalue to a predifined accuracy.

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A NUMERICAL METHOD FOR DYNAMIC TEMPERATURE RISE OF ASYNCHRONOUS MOTOR Li Danong, Ma Zhiyun 1997, 14(S1): 453-454,452.  Abstract ( )   PDF (129KB) ( )   The dynamic temperature rise of the enclosed asynchronous motor is computed by solving heat conduction equation. Numerical results show the same order of accuracy as in practical calculation for steady temperature rise.

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NUMERICAL SIMULATION OF ELECTRICAL CAPACITANCE TOMOGRAPHY Chang Hongsen, Bao Zongti 1997, 14(S1): 455-457.  Abstract ( )   PDF (151KB) ( )   It describes the finite element model of electrical capacitance tomography system for two-phase flows and the numerical simulation method based on back-projection algorithm.The flow element distribution image pertinent to the typical stratified regime is reconstructed.

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FLOW SIMULATIONS FOR POWERED ENGINES USING EULER EQUATIONS Li Jie, E Qin, li Eengwei 1997, 14(S1): 458-459,457.  Abstract ( )   PDF (178KB) ( )   A simulation method has been developed for the analysis of powered engines,whose components include the outer cowl,spinner,fan face,fan exit plane,and core cowl geometry.In the simulation,either the mass flux or the static pressure can be prescribed at the fan face.The total pressure,total temperature,flow direction and the bypass ratio are specified at the turbine or fan exit plane,and the exhaust plume emerges naturally as part of the global solution.Comparison of numerical results with test data shows a very good agreement.

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NUMERICAL SIMULATION OF ELECTRICAL HEATING OIL RESERVOIR Guan Jiteng, Wang Diansheng, Huang Liubin 1997, 14(S1): 460-462.  Abstract ( )   PDF (146KB) ( )   The r-z power model of electrical heating oil reservoirs is described for evaluating the temperature distribution and the production response.Based on the numerical results,the effects of formation conductivity on the oil-sand temperature and the effects of electrical power on the cumulative oil production are also discussed.

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MONTE-CARLO CALCULATION OF DIRECTIONAL DIFFUSION CURRENT IN PERIODIC POTENTIAL Bao Jingdong 1997, 14(S1): 463-464.  Abstract ( )   PDF (137KB) ( )   A stable and accurate integral closed algorithm is presented, which is used to solve multiplicative Langevin equation describing the directed motion of a particle in a periodic potential.

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STUDY OF THE RANDOM THICKNESS OF PARTICULATE MATTER BY MONTE CARLO METHOD Wang Zhongqi 1997, 14(S1): 465-466.  Abstract ( )   PDF (97KB) ( )   The random thickness of particulate matter is treated by Monte-Carlo Method.It is an improtant part of the Monte-Carlo study of the random geometry.Three kinds of the random thickness of Raschig Ring are studied here.

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DEVIL STAIRS IN THE COUPLED EQUATION OF J-J TYPE WITH AC-CURRENT Zhou Tianshou 1997, 14(S1): 467-468.  Abstract ( )   PDF (100KB) ( )   The numerical Computation displays some staircases and indacates existence of DEVIL STAIRS during the chaotic motions in the coupled equation of J-J type with ac-current.

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ALGEBRAIC MULTIGRID METHOD FOR QUEUEING NETWORKS Chang Qianshun, Ma Shuqing, Lei Guangyao 1997, 14(S1): 469-471.  Abstract ( )   PDF (131KB) ( )   A modified algebraic multigrid (AMG) method for queueing networks is presented.The method keeps the singularing of queueing networks by modifying the restriction operators.Numerical results indicate that this method is more efficient and robust than conventional AMG method.

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CALCULATIONS OF FACTORIZED MULTIPLICITIES CLASSIFIED BY QUASISPIN,ISOSPIN AND ANGULAR MOMENTUM FOR j-SHELL NUCLEONS Chen Jianhua, Li Chengzu 1997, 14(S1): 472-474.  Abstract ( )   PDF (129KB) ( )   According to the group chain[SO(5)⊃U(1)DⓧSU(2)T]ⓧ[Sp(2j+1)⊃O(3)],the coupling states of j-shell nucleons are classified by D=(n-2 j-1)/2,isospin T,angular momentum J and generalized quasispin[s,t],where s is generalized siniority and t is reduced isospin;the multiplicities classified are products of SO(5)⊃U(1)DⓧSU(2)T and Sp(2j+1)⊃O(3) group reduction multiplicities.The explicit formulas for the two group reduction multiplicities are presented,and some results calculated are listed.

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COMPUTER SIMULATION FOR ONE DIMENSIONAL AGGREGATION GROWTH Wu Fengmin, Zhu Qipeng, Wu Ziqin 1997, 14(S1): 475-476.  Abstract ( )   PDF (115KB) ( )   Taking account of the influence of diffusion and consistency of particles,a computer simulating model is presented based on random successive nucleation growth(RSNG) model of one-dimensional aggregation growth.A series of patterns and their fractal dimensions under nearest-neighbor and next-nearest neighbor conditions have been obtained.

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FULLY RELATIVISTIC DISTORTED-WAVE ELECTRON IMPACT EXCITATION THEORY AND CALCULATION Chen Guoxin, Qiu Yubo 1997, 14(S1): 477-479.  Abstract ( )   PDF (132KB) ( )   A fully relativistic distorted-wave Born theory for calculating electron impact excitational cross sections of highly charged ions is presented. Some calculation results are also given and compared with other calcultions.

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COMPUTATION ELECTRICAL CONDUCTANCE OF CABLE WITH COMPLICATED CROSS SECTION BY THE MULTIPOLE THEORY Zheng Qinhong, Xie Fuyao, Li Ming, Li Jingtian, Ou Jiaming, Wang Ruili 1997, 14(S1): 480-482.  Abstract ( )   PDF (141KB) ( )   Based on the MT(Multipole Theory),a new method is presented for calculating the electrical conductance of cables with complicated cross-section.By analyzing two examples, it is proven that the calculating accuracy of the MT is much better than that of the BEM(Boundary Element Method).

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APPLICATION OF WAVELET ANALYSIS IN PARASITIC PARAMETER EXTRACTION Gu Jiangchun, Wang Zeyi, Hong Xianlong 1997, 14(S1): 483-484,482.  Abstract ( )   PDF (132KB) ( )   A wavelet analysis method is applied to solve the system of linear equations generated by the 3-D boundary element method.The dense matrix is converted into a sparse one through data compression.The calculation speed is improved while solving the system of linear equations with the same coefficient matrix and several different right hand sides.

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COMPUTATION AND ANALYSIS OF A MAGNETIC SEXTUPOLE SYSTEM FOR CORRECTION OF SPHERICAL ABERRATION Zhou Qing, Chen Ergang, Hu Zonggao 1997, 14(S1): 485-486.  Abstract ( )   PDF (95KB) ( )   The spherical aberration of electron lens is always the principal factor which limits the resolution of electron microscope.An analysis and computation of magretic sextupole corrector to correct spherical aberration in a round lens is presented.The numerical results show that resolution of electron microscope can be improved by using the present system.

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THE KELLER BOX METHOD OF NUCLEAR EXPLOSION MANY GROUP γ-EMP Yin Wenhua 1997, 14(S1): 487-489.  Abstract ( )   PDF (140KB) ( )   It outlines the electromagnetic pulse induced by γ-ray radiated from nuclear explosion bomb and the Keller box method for solving Maxw ell equation.Comparison of results calculated from γ-EM P program with those from SHARP program is given as well.

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AN DYNAMIC CLUSTER MODEL OF SATELLITE CLOUD PICTURE CLASSIFICATION Yang Yuekui, ZhangFangyou, Liu Yuling 1997, 14(S1): 490-492.  Abstract ( )   PDF (127KB) ( )   On the basis of the characteristics of satellite cloud picture, this paper gives one automatic classification method of satellite cloud image:Iterative Self Organizing Data Analysis Techniques Algorithm (ISODATA). The satellite data used are from two channels of GMS 5. One channel is of 10.5-11.5μm, the other is of 0.55-0.9μm. The calculation shows:while the cloud image is classified as surface, high cloud, middle and low cloud, deep cloud, good results have been achieved.

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NUMERICAL SIMULATION OF TRANSONIC FLOW OVER AN ADVANCED TWIN ENGINE TRANSPORT AIRCRAFT E Qin, Li Jie, Li Fengwei, Liu Jilun, Yu Jianzhong 1997, 14(S1): 493-495.  Abstract ( )   PDF (170KB) ( )   A body-fitted orthogonal grid around complex configurations including wing,body,pylon and nacelle has been suc-cessfully generated by applying the multi-block grid technique and the method of solving elliptic and parabolic partial differential e-quations.The transonic flow field and aerodynamic characteristics of the advanced twin engine transport aircraft are also simulated numerically by using finite volume methods to solve the Euler equations with high efficiency,and the viscous effect of wing bound-ary layer is considered.Results of the calculation show that pylon and nacelle have significant effect on the supercritical wing aerody-namic characteristics.the numerical results are in good agreement with the experimental wing surface pressure distribution data.

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NUMERICAL STUDY OF WAVE STRUCTURE OF ROCKET JET FLOW Yang Hongwei, Ma Dawei, Zhang Fuxiang 1997, 14(S1): 496-498.  Abstract ( )   PDF (144KB) ( )   According to the MUSCL scheme with some modifications, the flow field structure of jet is numerically simulated. The results show that the present scheme has high resolution of shock wave, nonoscillation and high efficiency.

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MONTE CARLO METHOD AND ENERGY DISSIPATION DISTRIBUTION IN LOW-ENERGY ELECTRON BEAM LITHOGRAPHY Tan Zhenyu, He Yancai 1997, 14(S1): 499-501.  Abstract ( )   PDF (154KB) ( )   A Monte-Carlo method on low-energy electron (LEE) scatttering in multilyer and polybasic medium is proposed. The Mott cross-section applies for discribing the elastic scattering of LEE, and the idea of mean cross section is suggested to simulate LEE elastic scattering in polybasic medium; the modified Bethe formula in polybasic medium is used for calculating energy loss of LEE inelastic scattering. The energy dissipation distributions of LEE in PMMA have been obtained.

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AN APPLICATION OF VISUALIZATION TECHNOLOGY IN QUANTUM MECHANICS Wang Wudi, Li Xiaomei, Chen Jianhua, Hu Qingfeng 1997, 14(S1): 502-504.  Abstract ( )   PDF (122KB) ( )   Visualization In Scientific Computing (VISC) is a rapidly developing application of computer graphics. This paper introduces a Visualization System In Quantum Mechanics-VISQUM, and discusses some methods and techniques used in this system.

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A symptotic Stability of the Implicit Miltein Scheme for Linear Complex-valued Stochastic Jump-diffusion Equations Liu Xiaoqing, Li Zhenhua, Wu Shengchang 1997, 14(S1): 505-506.  Abstract ( )   PDF (110KB) ( )   The paper gives a necessary condition of asymptotic mean square stability for the implicit Milstein scheme for linear complex-valued stochastic jump-diffusion equations and shows how the stability depends on the implicitness of the scheme.

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DQ SEMI-ANALYTIC METHOD SOLVING DYNAMIC RESPONSE PROBLEMS ON THIN CIRCULAR PLATE Peng Jianshe, Zhang Jingyu, Yang Jie 1997, 14(S1): 507-509.  Abstract ( )   PDF (131KB) ( )   A computational method is proposed on the basis of controling partial differential equation of thin circular plate.It takes differential quadrature method in space domain and series in time domain,adopts DQ linear equations for solving all parameters of the displacement field by adding time points.

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COMBINED METHODS FOR A CLASS OF PARTITIONED STIFFLY LARGE SYSTEMS Chen Lirong, Liu Degui 1997, 14(S1): 510-511,509.  Abstract ( )   PDF (134KB) ( )   The combined RK-Rosenbrock(CRKR) methods are presented for a partitioned systems of stiffly large differential equations.Nonstiff and stiff subsystems are integrated in parallel on two processors by an explicit RK method and a Rosenbrock method respectively.Their construction,convergence and numerical stability are studied,and the numerical simulation experiments are conducted on a personal computer and a parallel computer.

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AN IMPROVED WEIGHTING LEAST SQUARES ALGORITHM FOR MATERIAL BLENDING PROBLEM Zhang Chenghui, Zhang Tiande, Tan Zhenyu 1997, 14(S1): 512-514.  Abstract ( )   PDF (128KB) ( )   This paper improves the identification algorithm given in[1] for raw material blending process. The improved algorithm is very suitable for the time varying process and can track the time varying parameter with high accuracy in time. Actual computation examples are provided. Compared with the results of algorithm[1], the new algorithm has a higher identification accuracy, more rapid convergence.

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A KIND OF INVERSE EIGENVALUE PROBLEM FOR REAL BI-SYMMETRIC PERIODIC JACOBI MATRICES Kong Cuifang, Lu Tongxing 1997, 14(S1): 515-517.  Abstract ( )   PDF (121KB) ( )   A kind of inverse eigenvalue problem is proposed for real bi symmetric periodic Jacobi marices. The sufficient condition for the problem to have unique solution has been apecified. When the condition holds, the calculating formula derived here can be used.

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THE STUDY OF THE SOLITON SOLUTIONS OF A CLASS OF GENERALIZED SCHRÖDINGER EQUATIONS Cao Qingjie, Zhang Tiande, Price G W, Djidjeli K, Twizell E H 1997, 14(S1): 518-520.  Abstract ( )   PDF (135KB) ( )   Soliton solutions of a class of generalized nonlinear Schrödinger equations are discussed analytically and numerically.This is achieved by using the travelling wave method to formulate soliton solution and the finite difference method for numerical solutions of the equations.

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USING THE EFFECTIVE POTENTIAL METHOD TO STUDY A CI TRANSITION MODEL Xu Aiguo, Wang Guangrui, Chen Shigang 1997, 14(S1): 521-523.  Abstract ( )   PDF (138KB) ( )   A generalized FK model is presented for treating phase transition problem with double-well interatomic interactions and a perturbed sinusoidal external potential,in which the interatomic interaction is of realistic significance.The effective potential method is used to study its phase diagram and a series of novel,complex but regular phase structures have been found.

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THE RESEARCH OF IMPROVED QUASI-STATIC METHOD IN REACTOR KINETICS Xu Yunlin, Jing Xingqing, Li Junli 1997, 14(S1): 524-526.  Abstract ( )   PDF (166KB) ( )   To solve the three-dimensional transient problems,the Improved Quasi Static Method(IQS) is adopted to deal with the temporal problem,and an improvement of synthesis method(YN) is also introduced.By factorizing the neutron flux,the time step of this method is enlarged so as to decrease the number of spatial calculations.For spatial calculations,Nodal Green's Function Method(NGFM) is used to determine the distribution of shape function,so the spatial mesh of IQSYN/NGFM can be about twenty times as large as that of finite difference method.

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ELECTRON ENERGY DISTRIBUTIONS, TRANSPORT COEFFICIENTS FOR CO2 LASERS EXCITED BY HIGH FREQUENCY DISCHARGE Wang Xinbing, Xu Qiyang, Liu Erwu, Xie Minjie, Li Zaiguang 1997, 14(S1): 527-529.  Abstract ( )   PDF (149KB) ( )   The Boltzmann equation is applied for the CO2 lasers excited by high frequency switching power,it has been solved numerically using cross-section-data available in the literature.The influences of frequency on the electron energy distributions and transport coefficients are also studied.

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A STUDY OF SIMPLIFIED FLUX-VECTOR SPLITTING ALGORITHM Ma Handong, Wu Liyi, Li Suxun 1997, 14(S1): 528-529,531.  Abstract ( )   PDF (150KB) ( )   A hybird scheme is constructed by Steger-Warming Splitting and its modified algorithm.The enlargment factor of pressure difference is used to prompt ability of flow field resolution.Meanwhile,a special matrix splitting method is adopted and makes matrices very easy to compute.Three examples of two-dimensional fluid flows containing shocks and/or boundary layer demonstrate the efficiency and accuracy of this new scheme.

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COMPUTATION AND ANALYSIS ON THE WARHEAD DETECTION Wu Jun, Liu Chengan, Ren Jie 1997, 14(S1): 530-534.  Abstract ( )   PDF (142KB) ( )   The γ ray transport process in some pits of warhead models has been studied.Since the penetrating γ ray spectra are different for different models,the feasibility of using the γ ray from fissile materials as the fingerprint of the warhead has been analyzed.By comparing the characteristics of γ ray's intensities,the thickness of bare ball of Wg.Pu can be estimated if its thickness is less than 1.5 cm.

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MONTE CARLO STUDY FOR ORIENTATIONAL TRANSITION IN SOLID C60 Liu Ying, Nie Xiangfu 1997, 14(S1): 535-536,534.  Abstract ( )   PDF (142KB) ( )   The orientational transition,heat hysteresis and pressure induced transition in crystal C60 have been simulated by the Monte-Carlo method.The numerical results are in agreement with those of experiment on the whole.

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PARALLEL PROCESSING IN THE METHOD OF INCREMENT FOR NONLINEAR FINITE ELEMENT STRUCTURAL ANALYSIS Zhou Shuquan, Peng Lidong 1997, 14(S1): 537-539.  Abstract ( )   PDF (129KB) ( )   Parallel processing in the famous method of increment for nonlinear finite element structural analysis is given.Some numerical examples are tested on multiprocessor Challenge-L.

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CALCULATING ANALYSIS FOR THE MONITOR HOLES IN THE REACTOR Zhong Wenfa, Zhou Quan 1997, 14(S1): 540-541,539.  Abstract ( )   PDF (131KB) ( )   Calculating model and method for the reactor physics design of the disposition of monitor holes are presented.The calculated results with this model show that the disposition of monitor holes increases the neutron flux andγflux out of the containment and concrete shell,and their effects in the shielding design should be accounted for.

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VALENCE-BAND OFFSETS OF TERNARY ALLOY HETEROJUNCTIONS (AlP)x(Si2)1-x/GaP AND (GaP)x(Si2)1-x/GaP Cai Shuhui, Zheng Jincheng, Wang Renzhi, Zheng Yongmei 1997, 14(S1): 542-544.  Abstract ( )   PDF (137KB) ( )   The valence band offsets ΔEv(x) as a function of the alloy compositon x of two typical lattice matched ternary alloy heterojunctions (AlP)x(Si2)1-x/GaP and (GaP)x(Si2)1-x/GaP are studied by using the average bond energy theory in conjunction with the cluster expansion method.It is shown that the variations of ΔEv(x) at (AlP)x(Si2)1-x/GaP and (GaP)x(Si2)1-x/GaP are nonlinear and non monotonous.The calculated results of ΔEv are in very good agreement with the data previously reported.

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NUMERICAL SIMULATION OF CONVECTIVE INSTABILITY IN THE IRON CORE OF SUPERNOVAE Zhang Suochun 1997, 14(S1): 545-546.  Abstract ( )   PDF (100KB) ( )   The(0.74-0.91)M⊙ of the iron core of Supernovae is a very important region of convective instability,which is found through the present numerical simulation.

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EFFECTS OF IRON CORE MASS OF SN Ⅱ ON PROMPT EXPLOSION Wang Yiren, Xie Zuoheng, Wang Weizhong, Zhang Suochun 1997, 14(S1): 547-549.  Abstract ( )   PDF (134KB) ( )   Energy cost that bounce shock wave on its propagation through outer iron core must pay for dissociation of heavy nuclei is considered as an adjusted parameter. Based on this, the method of artificial prompt explosion model is proposed to research effects of iron core mass of SN Ⅱ on prompt explosion. Range of iron core mass of presuperonva models which can produce prompt explosion is estimatd. The preliminary investsgation shows that iron core mass of presupermova models of WW(1993) is too large to produce prompt explosion.

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HE PRELIMINARY STUDIES OF THE COUPLED OCEAN-ATMOSPHERE DYNAMICS Jiang Dayong, Ji Liangda, Yang Dasheng 1997, 14(S1): 550-552.  Abstract ( )   PDF (146KB) ( )   Several global and limited area climatic models (including atmosphere models, ocean models, and coupled ocean-atmosphere models) are improved and developed according to the observational facts of coupled atmosphere ocean system and the theorem of coupled air-sea dynamics, The numerical studies of short-range climatic variation (i.e.monthly, seasonal, interannual) caused by atmosphere-ocean interaction are done by using observational data and Coupled Global Climatic Models (CGCMs).

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NUMERICAL SIMULATION STUDY FOR 3D GAS FLOW IN ENGINE CYLINDER BY ALE METHOD Liang Shuqing, Zhang Zhaoqun, Wei Defu, Tian Dongfeng 1997, 14(S1): 553-555.  Abstract ( )   PDF (145KB) ( )   It is an important research program based on numerical simulation for studying gas flow in engine cylinder to find a reasonal way of arranging gas flow efficiently. In this paper, a 3D Arbitrary Lagrange Euler (ALE) method is studied for this problem by developing KIVA Ⅱ. Some numerical simulation results are given for an example.

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NUMERICAL SIMULATION OF THE INTERACTION BETWEEN DAM-BREAKING LONG WAVE WITH OBSTACLE Wang Ruyun, Fang Guohong 1997, 14(S1): 556-557,555.  Abstract ( )   PDF (150KB) ( )   A numerical method is presented for solving the shallow water equation with TVD scheme. Comparison of the numerical solution with analytic solution shows that the method can well specity situation and shape of discontinuous surface. Further, numerical simulating studies about the interaction of a dam breaking long wave with an obstacle have also been done with reasonable results.

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THE FINITE DIFFERENCE METHOD OF THE BENDING PROBLEM OF PLATES THEIR EDGES THRENGTHENED BY BEAMS Qu Xiaogang 1997, 14(S1): 558-560.  Abstract ( )   PDF (131KB) ( )   Starting from the principle of minimum potential energy, a difference scheme is constituted for solving the bending problem of plates with their edges threngthened by beams,numerical results are presented, and the law of interaction between the plates and the boundary beams is investigated qantitatively.

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PROBABILITY DISTRIBUTION OF THE RADIUS OF GYRATION OF UNIFORM STAR POLYMERS Wang Zhihu, Luo Mengbo, Xu Jianmin 1997, 14(S1): 561-561,560.  Abstract ( )   PDF (134KB) ( )   A normal random walk(NRW) on the simple cubic lattice is used to simulate uniform star polymers with Monte-Carlo technigue.The probability distribution of gyration radius of uniform star polymers is investigated with various total segment number N and functionality f(number of branchs),and some properties about the distribution of uniform star polymers are illustrated.

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APPLICATION OF FINITE DIFFERENCE METHOD ON QUENCHING OF CrNi STEEL Cheng Heming, Guo Rongxin, Wang Honggang 1997, 14(S1): 562-565.  Abstract ( )   PDF (132KB) ( )   The explicit finite difference method is used to the quenching of CrNi steel, the relationship between surface heat transfer coefficients and temperature is determinated by means of solving the inverse problem of heat conduct equation.

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RANDOM SAMPLING TECHNIQUES OF THE NORMAL DISTRIBUTION Gong Ye 1997, 14(S1): 566-568.  Abstract ( )   PDF (133KB) ( )   T his paper assesses several sampling techniques for the normal distribution.A comparison of various techniques is given for practical applications.

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THE APPLICATION OF THE FINITE ELEMENT NUMERICAL METHOD TO CRITICAL PROBLEM OF TWO DIMENSIONAL HEXAGONAL ASSEMBLY CORE Chen Changyou 1997, 14(S1): 569-571.  Abstract ( )   PDF (129KB) ( )   The critical calculation of Few-group neutron diffusion problem for Two-dimensional Hexagonal assembly core Using finite element numerical method is studied.

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PROPAGATION REGULARITY OF BLAST WAVE ALONG THE 3D MULTISTAGE DIFFUSING-TUNNEL Hao Baotian, Zhang Haibo 1997, 14(S1): 572-573,571.  Abstract ( )   PDF (160KB) ( )   In 3D FLIC methods,an investigation has been done for the propagating process and regularity of shock-wave along the multistage diffusing tunnel.

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THE ELECTRONIC STRUCTURE OF QUASI-ONE DIMENSIONAL DISORDERD SYSTEM Xu Hui 1997, 14(S1): 574-576.  Abstract ( )   PDF (132KB) ( )   The electronic structure of quasi-one-dimensional disordered system is studied by the computation of the density of electronic states with the help of the negative eigenvalue theory. The localization of electronic states and the distribution zone of the system energy are discussed to the parameters of system size and the disordered degree of diagonal and non-diagonal elements. The electronic localized states are increased with the enhancing of the diagonal disordered degree and the distribution zone of the system energy is widened with the enhancing of the non-diagonal disordered degree.

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A MUILT-CYCLE OPTIMIZATION APPROACH AND PROGRAM SYSTEM FOR LOW-LEAKAGE CORE Cheng Pingdong, Shen Wei, Qian Huifu 1997, 14(S1): 577-578.  Abstract ( )   PDF (98KB) ( )   A multi cycle optimization approach and program system is developed for a low-leakage in-corefuel management. In this system, the multi cycle optimization process is achieved in three stages:At first, use a linear programming method to find an optimum power sharing distribution and optimum cycle length distribution for the successive several cycles. which yields maximum multi cycle total cycle length. Secondly, detenmine the optimum fuel arrangment on the basis of the Former stage results by employing a linear programming method or directly search method for successive every one of the multi cycle. In the third stage, optimize the burnable poison assignment by Flexible Tolerance Method (FTM).

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THE LIMIT CYCLE PHENOMENA IN RESPONSES OF AIRPLANE WINGS WITH SEPARATED VORTEX Ye Zhengyin, Yang Yongnian 1997, 14(S1): 579-580,578.  Abstract ( )   PDF (152KB) ( )   The aeroelastic behaviour of wings with different types of separated vortex at high incidences is investigated.The unsteady aerodynamic equations and the equations of motion are solved simultaneously in the time domain.The separated vortices shed-ding from the leading-edge and/or side-edge of wings are taken into account by an improved Nonlinear Vortex-Lattice Method.The equations of motion are integrated by Runge-Kutta Method.Wings with different planforms at different basic incidences are consid-ered.It is found that (1) the separated vortex shedding from the leading-or side-edges results in the critical flutter speed of the wing lower,and the higher the basic incidence,the lower the critical flutter speed.(2) the smaller the sweep of wing,the smaller the in-fluence of separated vortex on the aeroelastic characteristics.(3) at certain flight speeds and basic incidences,stable limit cycles ap-pear,and the amplitudes of limit cycles even keep constant when the initial distu rbances of response vary.

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THE STRUCTURE OF GAS OUTFLOW DURING THE OUTBURSTS FROM VO332+53 Mi Guozhu, Shen Jinying 1997, 14(S1): 581-583.  Abstract ( )   PDF (130KB) ( )   A hybrid model consisting of a gas disc plus a slowly accelerating wind is used to calculate the X-ray light curves in a Be and neutron star binary.The observational data of VO332+53 are coincident with some of them.

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A LATTICE BOLTZMANN MODEL WITH 2 SPEED 3 ENTROPY LEVEL FOR EULER EQUATIONS Yan Guangwu, Hu Shouxin, Shi Weiping 1997, 14(S1): 584-586.  Abstract ( )   PDF (131KB) ( )   A new lattice Boltzmann model is proposed for treating Euler equations. The numerical example shows that it can be used to simulate shock wave and contact discontinuity. The results are comparable with those obtained by traditional methods.

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LATTICE MODELS FOR LINEAR AND QUASI-LINEAR PARABOLIC EQUATIONS Li Yuanxiang, Kang Lishan 1997, 14(S1): 587-589.  Abstract ( )   PDF (134KB) ( )   Lattice method is a new method of numerical simulation for fluid dynamics developed recently.Its essential idea is the model-rebuilding.Based on this method two models are composed for linear and quasi-linear parabolic equations.Several typical numerical examples are studied using the models and satisfactory results are achieved.

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THE NUMERICAL CALCULATION OF TRANSONIC UNSTEADY VISCOUS FLOWS AROUND THE OSCILLATING WING Guo Guangli, Yang Yongnian 1997, 14(S1): 590-591,589.  Abstract ( )   PDF (139KB) ( )   A numerical method is presented for calculating the unsteady transonic viscous flows around oscillating aerofoil and wing based on the unsteady Navier-stokes equations.It adopts an implicit NND algorithm and Baldwin-Lomax turbulence model in solving procedure.The computational grid is C and C-H types in a body-fitted coordinate system generated by an algebraical method. The transonic viscous flows around the NACA 0012 aerofoil and M6 wing with pitching oscillation have been calculated.Numerical results are in good agrement with experimental data.

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AN ALGORITHM FOR THE IDENTIFICATION OF OSCILLATORY COMPONENTS IN CHAOTIC SIGNALS Liu Jianwen, Dong Peiming, Li Yaodong, Wang Bingren, Jing Weiming 1997, 14(S1): 592-594.  Abstract ( )   PDF (143KB) ( )   The Singular Spectrum Analysis method,especially on the fundamental property of identifying the oscillatory compo-nents,is described.It is applied to a 30-year surface temperature series of east-southem china with a windows length of 100 days.Two main low-frequency oscillations with period of 35-40day and about 20 days are found to be robust,accounting for about 90% of total variance in the relevant frequency band.

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NUMERICAL CALCULATION OF FLOW FIELDS IN PULVERIZED COAL BOILER Wang Jian, Liu Tuanjie, Fan Weicheng 1997, 14(S1): 595-596,594.  Abstract ( )   PDF (148KB) ( )   By applying different schemes of meshes, the calculations of flow fields in pulverized coal boilers are discussed.The results show that false diffusion may be tremendous when using meshes generated in a normal method.Consequently, the error of results is very high.Meanwhile, acceptable results may be obtained when using properly generated meshes.

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MONTE-CARLO STOCHASTIC METHOD AND INTEGRAL INTERPO-LATION METHOD FOR SOLVING GROUNDWATER FLOW PROBLEMS Cui Xiu, Wu Fei 1997, 14(S1): 597-599.  Abstract ( )   PDF (136KB) ( )   The integral interpolation method and Monte-Carlo stochastic method are adopted to study groundwater flow problems theoretically, and the Monte-Carlo Stochastic Difference Method (M.C.S.D.M.) is also developed.The calculating patterns and treatments of boundary conditions for the two kinds of methods are deduced and analyzed; For a two-dimension confined stable groundwater flow mathematical model.We compared its analytical solutions with the results of M.C.S.D.M.They concide very well.

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THE NUMERICAL SIMULATION FOR PRECURSOR OF AN EARTHQUAKE USING THE MODIFIED BURRIDGE-KNOPOFF MODEL Xiao Jiaxin, Lin Jiati, Zheng Ximing 1997, 14(S1): 600-602.  Abstract ( )   PDF (142KB) ( )   Two meaningful modifications,nonlinearity and inhomogeneity,for Rurride-Knopoff model are provided.The precursor of an earthquake is simulated by using the fourth order Runge-Kutta method.The results obtained are similar to the Tangshan M7.8 earthquake.

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A NEW INTERPRETATION TO LEVINTHAL'S PARADOX Wei Guangchuan, Lin Jiati, Xiao Jiaxin 1997, 14(S1): 603-604,602.  Abstract ( )   PDF (135KB) ( )   The influence of interaction between residues on Levinthal's paradox in the course of protein folding is discussed.The results show that the paradox is caused by:(1) no considering the relationship between transition rate and energy difference;(2) no accounting for the influence of interaction energies between residues.

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COMPUTER SIMULATION IN THE FORMATION PROCEDURE OF TWO DIMENSIONAL MOULDS Li Jianshi, Chen Tianjian, Mei Guangqian 1997, 14(S1): 605-607.  Abstract ( )   PDF (132KB) ( )   It discusses a mechanical model as well as its contact-searching method and dynamic explicit algorithm used for formation procedure of two dimensional moulds.A specific example of an electrical mould for applicaiton interest is also presented.

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A COMPUTER PACKAGE FOR IBM-2 IN THE F-SPIN FORMALISM Zhang Jinyu, Long Guilu, Sun Hongzhou, Han Qizhi 1997, 14(S1): 608-610.  Abstract ( )   PDF (133KB) ( )   A computer package for the neutron-proton interacting boson model is presented.It used the F-spin symmetric U(5) limit wavefunction as its basis states.Hamiltonian and other operators are written in terms of F-spin tensorial form.In the input,in addition to the hamiltonian forms in terms of neutron and proton bosons indices,F-spin tensorial formalism is also provided.B(M1) and B(E2) can also be calculated in the package.

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A NEW METHOD OF THE CONSTRUCTION OF HIGH-ORDER COMPACT SCHEME FOR THE STEADY CONVECTION-DIFFUSION EQUATION Tian Zhenfu 1997, 14(S1): 611-613.  Abstract ( )   PDF (129KB) ( )   On the steady convection-diffusion equation,a new method is developed for construction of high-order compact finitedifference scheme.First,the two-dimensional equation are transformed into the two equations,which are similar to the form of onedimensional equation,and are subsequently discretized by utilizing compact difference formula proposed for the one-dimensional equation in[6].Then,a compact difference scheme that is O(h4+h2k2+k4) on the nine-point 2-D stencil for the steady convectiondiffusion equation is established.Finally,numerical example is given to illustrate the present method.

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PARAMETERS OF LASER-GENERATED PLASMA AND ENHANCED COUPLING EFFECT Zhang Jianquan, Liu Feng, Chen Ronghua, Qiang Xiwen 1997, 14(S1): 614-616.  Abstract ( )   PDF (141KB) ( )   By means of a hydrodynamic model in which electrons and ions have different temperature and same isothermal expanding velocity,it deals with interaction process of the intense pulse laser with the target,and gives scaling relationships between the plasma parameters and the laser or the target behaviour,in which include equilibrium absorption and radiation in the plasma.

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RECONSTRUCTION OF PIN POWER IN HEXAGONAL GEOMETRY Chen Chao, Zhu Guangning, Wang Kan 1997, 14(S1): 617-618,616.  Abstract ( )   PDF (138KB) ( )   A reconstruction method is described for hexagonal assemblies. The program named JXJS has been encoded based on the model; The JXJS results are compared with calculated results by solving the equations in reference[1](61tri/hexagonal assembly) and analysis of error has been also performed.

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PARALLEL HOMOTOPY CONTINUATION ALGORITHM FOR NONSYMMETRIC GENERALIZED EIGENVALUE PROBLEM Xue Changfeng, Zhou Shuquan 1997, 14(S1): 619-621.  Abstract ( )   PDF (131KB) ( )   Parallel computation for the nonsymmetric generalized eigenvalue problem is one of the fundamental problems in large scale engineering computation.A homotopy continuation algorithm is proposed to deal with parallel computation for this eigenvalue problem.Numerical results show that it has advantages of high parallel efficiency and fast convergence speed.

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USING IMPROVED RAY TRACING METHOD TO ANALYZE THE APPARENT SPECTRAL EMISSIVITY OF A BODY OF SEMI-TRANSPARENT MEDIUM HAVING SOME DIFFUSE SURFACES Xia Xinlin, Yu Qizheng, Tan Heping 1997, 14(S1): 622-623,621.  Abstract ( )   PDF (147KB) ( )   Combined with the radiosity intensity of diffusely reflecting surfaces,the improved ray tracing method is reversely employed to analyze the apparent spectral emissivity of a body of semi-transparent medium having some diffuse surfaces.The radiosity intensities of a diffusely reflecting surface are obtainde by iteratively solving the energy balance equations of all discrete zones and using the ray tracing method reversley.The apparent emissivity results obtained by this method are separately compared with the exact solutions of the semi-transparent slabs and the numerical values of disc bodies of semi-transparent medium gained by Monte-Carlo method,and the apparent emissivity of a disc body is investigated.

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NUMERICAL SIMULATIONS OF DIPOLE INTERACTIONS IN METAL NANOCOMPOSITES Yao Duanzheng, Xiong Guiguang 1997, 14(S1): 624-626.  Abstract ( )   PDF (136KB) ( )   The dipole in teractions in nanocomposites are described by means of coupled-dipole equation.The relationships of spectral variable and the decay constant against wavelength for Ag,Cu particles in water and Au particles in silicon have been obtained and analysed.

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NUMERICAL STUDY ON THE STRUCTURE OF REFLECTIVE-TYPE-SEMICIRCULAR OPTICAL FIBRE Li Yingjun, Teng Aiping, Zhang Guangcai, Peng Hansheng 1997, 14(S1): 627-628,626.  Abstract ( )   PDF (149KB) ( )   The best coupling structure of the reflective-type-semicircular-optical fiber probe has been studied by using the method of numerical simulation. Distributive curve of the intensity of the reflective light on the incident plane of the light is given by computer simulation to the different radii of optical fiber cores which are separately 3μm, 5μm, 10μm, 15μm. and the radius of the optical fibers are totally 20m. The results show that the best coupling radius of the reflective type semicircular optical fiber probe satisfies the formula. ρmax=R-0.01004a3+0.37429a2-3.38095a+16.85714(μm).

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SOLVING ELECTROMAGNETIC SCATTERING FROM MEDIA WITH AN ARBITRARY NUMBER OF PLANAR LAYERS WITH FAST FOURIER TRANSFORM (FFT) Hu Jun, Nie Zaiping 1997, 14(S1): 629-631.  Abstract ( )   PDF (138KB) ( )   For electromagnetic scattering and inverse scattering problem in inhomogeneous media,calculating Hankel transform rapidly,accurately is often required in order to perform efficient forward calculation.Here,fast Fourier transform is used to finish the calculation of Hankel transform in case of a dipole exciting in arbitrary planar layer-media.

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AN ALGORITHM AND APPLICATION FOR INVERSE EIGENVALUE PROBLEM OF 5-DIAGONAL MATRIX Sun Herming, Lü Tongxing, Zhao Chunsheng 1997, 14(S1): 632-634,631.  Abstract ( )   PDF (205KB) ( )   An algorithm for constituting 5-diagonal real symmetrical matrix fDrom spectral data is given.The application to an inverse problem of vibrating beam is also presented

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BOUNDARY ELEMENT METHOD FOR THE DIFFRACTION OF ELASTIC WAVE Chen Guorong, Jiang Hongdao 1997, 14(S1): 635-637.  Abstract ( )   PDF (125KB) ( )   The diffraction of elastic wave is studied by using Boundary Element Method, and the formulation about elastic wave diffraction is given. For caculating singular integral, a improved numerical method which divides dynamic fundamental solution into singular part and regular part is proposed. Finally examples of P wave and SV wave scatter against circular hole and ellipse hole are discussed.

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COMPUTER SIMULATION OF THE ARC DEFLECTION AND ITS CONTROL IN DC ARC FURNACE Hong Xin, Zhu Shoujun, Xie Shuyuan, Liu Junjiang, Fu Runsheng, Luo Jianjiang 1997, 14(S1): 638-640.  Abstract ( )   PDF (150KB) ( )   Based on the principle of mutual action of micro electric currents in DC arc column and dynamic balance of electromagnetic forces in an arc region caused by spatial current loading wires, mathematical models of numerical simulation are proposed for DC arc deflection, arc deflection control by multi-botton-electrodes and by inclination of top electrode. Computer simulations are performed to investigate the deflection phenomenon and its control.

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A FAST EFFICIENT METHOD OF CONVERGING DIVERGENT FOURIER SERIES Yu Huidan 1997, 14(S1): 641-642,640.  Abstract ( )   PDF (134KB) ( )   A fast efficient method is presented for converging fourier series,which comes from Bensimon equation.As an example,the simulation is given for the evolution of nonsingular saffman-Taylor finger in the presence of surface-tension.

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SIMULATION OF INRUCH CURRENTS IN TRANSFORMERS USING FIELD-CIRCUIT COUPLED Xiao Hongjie 1997, 14(S1): 643-645.  Abstract ( )   PDF (161KB) ( )   It aims carry out a two-dimensional non linear, time stepped Finite-Element simulation of inrush currents in sinale phase transformers. The model couples the finite element electromagnetic equations with the electrical circuit equations. the saturation and hysteresis characteristics of the core material in transformers are taken into account.

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NUMERICAL CALCULATION OF THE BLOWOFF IMPULSE INDUCED BY IRRADIATING OF ELECTRO-BEAM AND THE COMPARISONS WITH EXPERIMENTALS Ding Sheng, Zhou Nan 1997, 14(S1): 646-648.  Abstract ( )   PDF (132KB) ( )   Using Monte-Carlo method, the electon transport and energy deposition in material are calculated. Combining with the elastic plastic hydrodynamic equations, numerical results cover the thermal mechanical effect and the blowoff impulse on Ly-12 Al induced by irradiating of the impulsive electrobeam which caused by ‘FLASH Ⅱ’-an impulsator of relativistic electron beams. these results are compared with the experimental data.

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THE APPLICATION OF SYMPLECTIC ALGORITHM ON NUMERICAL RESEARCH OF THE ORBITAL EVOLUTION OF THE NEAS Liu Lin, Liao Xinhao, Ji Jianghui 1997, 14(S1): 649-651.  Abstract ( )   PDF (133KB) ( )   The numerical research about the orbital evolution of NEAs has been made by adopting the improved explicit Symplectic Algorithm. For the mechanic model, Post-Newtonian effect has also been taken into account, apart from considering the gravitational perturbations of major Planets, while for the algorithms the investigation focuses on the applicable prospect that the Symplectic Algorithm would be suitable for the study of the orbital evolution of the NEAs, especially for the effectiveness of the Symplectic Algorithm in the case that the NEAs close approach a major planet.

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THE VECTOR ALGORITHM OF HENYEY SCHEME FOR THE CALCULATION OF STELLAR STRUCTURE AND EVOLUTION Luo Guoquan, Huang Runqian 1997, 14(S1): 652-654.  Abstract ( )   PDF (131KB) ( )   On the basis of the differential equations of stellar structure and its boundary conditions,the difference equations are obtained in the form of vector functions.The New ton-Raphson method allows transfering the difference equations in to a matrix equation in vector algorithm which is solvable.

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ON THE COUPLING FIELD WITH CHANGING PHYSICAL PROPERTY AND WITH COMBINATIVE BOUNDARY CONDITION Yan Guiqing 1997, 14(S1): 655-656,654.  Abstract ( )   PDF (136KB) ( )   An approximaive solution is given of the equation of hot elasticity with changing physical property and with coupling effect,under the thermal shock,within the framework of the orthogonal isotropic body.It develops the discussion in recen tyears on the coupling field with constant physcial property.

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THE EXPERIMENT AND STUDY FOR THE ELIMINATE “NEGATIVE MOISTURE” Ge Xiaozhen, Li Feng 1997, 14(S1): 657-659.  Abstract ( )   PDF (155KB) ( )   The second order moment conservation and Bottadvection schemes that are responsible for being positive definite and high accurate are introduced into the MM4(meso scale model) for moisture advection.When separately used with the MM4 with observed windfields available a range of scenarios have been subjected to theoretical test and numerical experiments done with more than one rainstorm event.Nurnerical results show that the improvement of calculation accuracy of model moisture advection is the key link of raising the prediction of weather calamities like heavy rain.

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A STUDY ON THE APPLICATION OF CLOUD MODEL IN AVIATION Wang Bingren, Jin Weiming, Li Yaodong, Wang Hongfang, Liu Jianwen, Dong Peiming 1997, 14(S1): 660-662.  Abstract ( )   PDF (239KB) ( )   With the mesoscale model being used as the dynamical frame, and coupled with the cloud model of explicit scheme, a numerical simulation is conducted on the macro parameters of cloud fields, water vapour of cloud and size-distribution of the spectrum of cloud particles, based on which the application of cloud model in aviation is also investigated.

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AN IMPROVED LATTICE BOLTZMANN METHOD FOR THE SHALLOW WATER LONG WAVE EQUATION Shi Weiping, Hu Shouxin, Yan Guangwu 1997, 14(S1): 663-665.  Abstract ( )   PDF (131KB) ( )   Based on the equivalence between the aerdynamical Euler equation and the shallow water long wave equation, the equilibrum distribution function of the orginal LBM is improved, and hence the macrodynamical equation of shallow water long waves is derived. The resoults of one dimentional numerical test are compaired with those obtained by discrete velocity model.

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THIRD-ORDER ACCURATE RECONSTRUCTION WITH UPWIND COMPACT DIFFERENCE IN CURVILINEAR COORDINATE AND ITS APPLICATION Wang Baoguo, Guo Yanhu, Shen Mengyu 1997, 14(S1): 666-668.  Abstract ( )   PDF (137KB) ( )   A new reconstruction method for the difference of primitive function derivation is developed on structure meshes.Such a scheme is based on a finite volume discretization.It achieves 3-order spatial accuracy with upwind compact difference.Numerical experiment of transonic channel flow is presented and discussed.

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STRUCTORE PROPERTY AND QUANTOM CHEMISTRY CALCVLAION OF FERRO-ALUMIHVATE OF CEMEN MINERALS Min Xinmin, Deng Zhiping, CaiKefeng, Li Jiayu 1997, 14(S1): 669-670,668.  Abstract ( )   PDF (139KB) ( )   Structures, properties and chemical bonds and of ferro aluminates of cement minerals are studied by SCF-Xα-DV method, one of the molecular orbital calculating method in quantum chemistry. The calculated results show that the net charge of Al is higher than that of Fe, the covalent bond of Al-O is weaker than that of Fe-O, and with the increase of Al element content, the net charge of Al becomes higher, the covalent bond of Al O shows weaker, and the energy level of the lowest unoccupied molecular becomes lower, those are just the reason that with the increase of Al element, there is superior hydration activity of ferro aluminates.

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LATTICE-BOLTZMANN MODELS FOR MASS DIFFUSION Sun Chenghai, Wang Baoguo, Shen Mengyu 1997, 14(S1): 671-673.  Abstract ( )   PDF (154KB) ( )   A multispecies,multispeeds lattice Boltzmann model is presented to study the mass diffusion properties.The diffusion equations are derived by the Chapman-Enskog method.The one dimensional simulations for the sinusoidal concentration distributions are compared with the theoretical results,showing good agreement.The numerical simulations for 2-D convection diffusion problems are also presented.

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NUMERICAL SIMULATION OF PLASMA COLLISIONAL SHEATH FOR CYLINDRICAL TARGET IN PSⅡ Yu Jiong, Gong Ye 1997, 14(S1): 674-676.  Abstract ( )   PDF (129KB) ( )   The evolution of the plasma collisional sheath in cylindrical geometry has been numerically simulated using a collisional fluid dynamic model.The numerical simulation method is easy to be performed,and the convergence velocity is rapid.A good agreement is obtained for collisional sheath evolution in cylindrical geometry between the fluid dynamic model and the analytic model.

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NOTES ON TRANSPIRATION CONTROL EQUATIONS Yang Xueshi 1997, 14(S1): 677-679.  Abstract ( )   PDF (131KB) ( )   It presents the characteristics of some parameters and physical problems which are described in three kind of transpiration control equations,and provides a part of the numerical simulation results.

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USING MONTE-CARLO METHOD TO CALCULATE THE STRAY LIGHT OF AN INFRARED OPTICAL SYSTEM Xia Xinlin, Tan Heping, Yu Qizheng, Wang Pingyang 1997, 14(S1): 680-681,679.  Abstract ( )   PDF (138KB) ( )   The Monte-Carlo method is applied to calculate the stray light of an infrared optical system.The system's geometrics tructure and the physical kinds of its elements are standardized.Some relevant probability models are established and a ray tracing approach is employed which can speed the calculation effectively.On the basis of those,an universal computer program is developed,and the stray light of an infrared camera has been analyzed.

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NUMERICAL SIMULATION FOR THE EFFECTS IN IMPACT DYNAMIC INDUCED BY PULSE POWER LASER Chen Ronghua, Zhang Jianquan, Li Banggu, Liu Feng, Qiang Xiwen 1997, 14(S1): 682-683.  Abstract ( )   PDF (106KB) ( )   The one-dimensional ideal elastic-plastic fluid hydrodynamical model with finite difference method is used to study the processes of formation and decay of the shock waves induced by laser irradiation to solid targets and effects of dynamic fracture.

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CALCULATION OF RADIATION PRODUCTION OF HIGH SPECIFIC ACTIVITY ISOTOPES 192Ir AND 60Co Zhou Quan, Zhong Wenfa, Xu Xiaolin 1997, 14(S1): 684-686.  Abstract ( )   PDF (127KB) ( )   The high specific activity isotopes:192Ir and 60Co in the high neutron flux reactor are calculated with the method of reactor physics.The results of calculation are analyzed in two aspects:the production of isotopes and the influence to parameters of the reactor,and hence a better case is proposed as a reference to the production.

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THE NUMERICAL RESULTS FOR THE NONLINEAR LOCALIZED EXCITATION IN DNA Yang Xianjun, Wang Zhongqi, Zhuo Yizhong 1997, 14(S1): 687-689.  Abstract ( )   PDF (185KB) ( )   A simple model for DNA molecules is proposed.The dynamical mechanism of the nonlinear localized excitation is studied by Runge-Kutta method.The large amplitude motion is simulated for N coupling base pairs of DNA molecules.The physical picture of the nonlinear localized excitation and its stable propagation can be emerged by means of adopting suitable parameters of Hamiltonian and time stpe.The nonlinear interaction on the beather effect is also discussed.

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WEAKLY INTERACTING BOSE-EINSTEIN CONDENSATION IN A HARMONIC POTENTIAL TRAP Zheng Jincheng, Yan Zijun, Lin Zhongjin, Chen Lixuan 1997, 14(S1): 690-692.  Abstract ( )   PDF (134KB) ( )   The critical temperature and the ground state fraction of weakly interacting Bose-Einstein condensation in a harmonic potential trap are calculated with numerical method. The result indicates that both are decreasing with the scattering length increasing. But, there is only a difference about 0.4% between it and that of ideal case.

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A SOLUTION OF MULTI-DIMENSIONAL TRANSIENT INVERSE HEAT CONDUCTION PROBLEM USING THE LEAST SQUARE METHOD Bai Bofeng, Guo Liejin, Chen Xuejun 1997, 14(S1): 696-698.  Abstract ( )   PDF (143KB) ( )   The inverse problem of multi dimensional transient heat conduotion is studied with the least square method to determine the unknown boundary condition.The numerical tests show that this method has advantages of simple calculating, high precision and les effect of the measurement error.

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COMPUTATIONAL METHOD OF THE TWO POINT SCHEME FOR A KIND OF ORDINARY DIFFERENTIAL EQUATIONS WITH BOUNDARY VALUE CONDITIONS Tan Zhihai, Wu Xionghua 1997, 14(S1): 699-701.  Abstract ( )   PDF (123KB) ( )   A two point scheme with high order accuracy on arbitrary mesh is presented for a kind of singular perturbation problems based on the idea of[1].Some improvements about boundary treatment and keeping stability are also given.Numerical examples found the method more convenient and efficient for singular perturbation problems.

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CONSERVATION QUANTITIES OF THE EXPLICIT SYMPLECTIC SCHEMES FOR SEPARABLE AND LINEAR HAMILTONIAN SYSTEMS Wu Chengxun, Zhou Zhongyuan, Ding Peizhu 1997, 14(S1): 702-704.  Abstract ( )   PDF (145KB) ( )   The scheme-conservation quantities of the 1-and 2-order explicit symplectic schemes are found according to the quadric-form conservation quantities for Separable and linear Hamiltonian Systems.It can be shown that so long as the time-step is properly small the norm and the energy can keep conservied in certain accuracy.

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RESEARCH OF ADVANCED BURNING ECTINIDE SUB-CRITICAL BREEDER Wu Yu 1997, 14(S1): 705-707.  Abstract ( )   PDF (146KB) ( )   Sub-critical breeder fuelling actinide series and driven by D-T fusion neutrons can use uranium source effectively.Due to keff less than 1 and low blanket power density,it has good safety quality.Because of the strong neutron breeding capability,the breeder can be driven by a small neutron source.With a 50~100 M Wt fusion core,the reactor can produce 1 GWe energy,1000 kg fertile to support 3~4 PW Rs as the same power,and burn actinides produced by 3~4 PW Rs.At the same time,the reactor blanket can also produce sufficient tritium for fusion reaction.

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THE INTERPOLATING MATRIX METHOD FOR NONLINEAR MULTIPOINT BOUNDARY VALUE PROBLEMS Niu Zhongrong, Wang Xiuxi 1997, 14(S1): 708-710.  Abstract ( )   PDF (136KB) ( )   The fundamental theory of interpolating matrix method is eatablished for solving mixed order systems of nonlinear multipoint boundary value problems of ODEs.A general purpose solver IVMMS of ODEs is written based on this know ledge,and which can support the finite element method of lines for solid mechanics.

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THE PARALLEL NUMERICAL SIMULATION OF TRANSONIC FLOW THROUGH PLANE CASCADE Xie Le, Dai Jiazun 1997, 14(S1): 711-713.  Abstract ( )   PDF (132KB) ( )   A parallel algorithm is proposed for calculating transonic flow through plane cascade with the improved relaxing schemes[1].The numerical results in Jiang-Nan Ⅱ-multi processor have been obtained.

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DISTURBANCE MODEL FOR EDDY CURRENT TESTING Duan Yaoyong, Chen Ronghua, Sheng Jianni, Chen Yusheng 1997, 14(S1): 963-695.  Abstract ( )   PDF (146KB) ( )   According to the conductor's skin effect in low frequency electromagnetic field and the characteristic of comparatively small excitement coil in the benchmark model for eddy current testing, a perturbation model is proposed by combining the axisymmetric field and the 3-dimensional field, in which the disturbed field due to crack in the conductor allows being solved.