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25 September 1988, Volume 5 Issue 3 Previous Issue    Next Issue

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A VARIATIONAL SOLUTION OF THE GEOMETRIC BUCKLING OF REACTOR FOR ELLIPSOID AND LTS APPLICATION Zhang Jun 1988, 5(3): 249-258.  Abstract ( )   PDF (527KB) ( )   The geometric buckling is of great value in application to criticality problem and analysis of dynamic process of supercritical system in fast fission reactor. The geometric buckling of bare reactor of homogeneous ellipsoid is solved analytically with variational method, and the deductive process is given in detail in this paper, We also apply the solution to bare reactor of inhomo-geneous ellipsoid and infinite reflected reactor. The analytical results agree quite well with the ones of 2 dimesion numerical simulation.

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THE FINITE ANALYTICAL SOLUTION OF 3-D LAPLACE AND POISSON EQUATION AND ITS APPLICATION Liu Han-Li 1988, 5(3): 259-268.  Abstract ( )   PDF (556KB) ( )   In this paper The exact Coefficients of The Finite analytical solution of Laplace and Poisson equation and The FAS of Laplace equation is given.The examples of computation of Heat transfer is prove d. agreement with BFET and than simple and accurate.

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THE NUMERICAL SIMULATION OF VORTEX GENERATION IN FLUID FLOW AROUND A FLAT PLATE AT LARGE ATTACK ANGLES Lu Jian-Qun 1988, 5(3): 269-275.  Abstract ( )   PDF (467KB) ( )   A class of new scheme is constructed on the basis of vortex blob method combined with finite element method and infinite similar element method. The numerical solution of Navier-Stokes equation is obtained over the entire unbounded domain. The scheme overcomes the difficulties induced by both singularity of the solution of the equation near a convex corner point on the boundary any infinite point. It is simulated that fluid flows around a flat plate at large attack angles and initial results are presented.

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PARTICLE SIMULATIONS OF CERENKOV RADIATORS USING A DIELECTRIC-LINED WAVEGUIDE Chang Wen-Wei, Zhang Li-fu 1988, 5(3): 276-288.  Abstract ( )   PDF (668KB) ( )   A stretched one and two halves dimensional relativistic electromagnetic particle code is used to simulate the Cerenkov emission process from a relativistic electron beam when it is passing through the hole of a dielectric-lined waveguide at a speed more than the speed of light in the dielectric. Simulation results show that Cerenkov process is a potential high-power source of short-wavelength radiation.

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HARTREE-FOCK FINITE ELEMENT CALCULATIONS FOR THE HELIUM-LIKE ION GROUND STATE Shi Sung, Ding Pei-Zhu 1988, 5(3): 289-301.  Abstract ( )   PDF (717KB) ( )   It is in the middle of 70's FEM has been used to obtain numerical solutions of atom and molecule problems. Little as the research work done is, it is shown that FEM is effective for one and two dimensions problems. But at least now it is impossible to use to problems of atom with n (≥ 3) electrons. A method (HFFEM) combined FEM with HF method is advanced and by using HFFEM the energy of the He-like ion ground state and mean value n> is computed on DP58. Compared the energy value obtained with one measured, the error lies between 0.3% and 0.03%. The HFFEM may be extended to applied to various atom and molecule problems.

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THE RELATIONSHIP OF TEMPERATURE DISTRIBUTION AND TIME DURING COOLING AND SOLIDIFICATION PROCESSING OF METAL DROP Pan Ming-xiang, Chen Xi-chen 1988, 5(3): 302-312.  Abstract ( )   PDF (580KB) ( )   The differental equation for the relationship of temperature distribution in solid, interface distance and time during cooling and solidificatian Processing of metal drop has been solved in one dimensional equation of heat conduction in spheriodal coordinate, and the relationships of tempertuer distribution in liquid and time during liquid cooling, and of solidification time at invariant temperature and spherical diameter are inferenced from the solution.

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AN ACCURATE METHOD FOR CALCULATING PROBABILITIES OF BOUND ELECTRONS UNDER LTE Lin De-wen, Zou Li-yao, Liou Guang-yu 1988, 5(3): 313-324.  Abstract ( )   PDF (570KB) ( )   Under the assumpation of the average ion model, this article gives the equations of probabilities of bound electrons in the n-th energy state of atoms.

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THE TWO DIMENSIONAL DISCONTINUOUS FINIT ELEMENT METHOD FOR SOLVING THE TRANSPORT PROBLEM WITH ANISOTROPIC SCATTERING Fu Shang-Wu 1988, 5(3): 325-338.  Abstract ( )   PDF (713KB) ( )   In this paper, We present a numerical method for solving the transport problem with anisotropic scattaring in one-dimensoional sphere geometry. Norm estimates of approximate solution are given Finally, some results are presented.

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VARIATIONAL OPTIMAL ALGORITHM FOR THE NUMERICAL COMPUTATION OF LIMIT CYCLE AND PERIOD OF THE BRUSSELATOR Zhang Suo-chun 1988, 5(3): 339-349.  Abstract ( )   PDF (604KB) ( )   In this paper, we have designed the variational optimal algorithm, and used it to compute simultaneously the limit cycle and period of the Brussela-tor.

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SOME METHODS OF TREATMENT AND THEIR COMPARISON ON SINGULARITY DUE TO SHARP TURNING POINTS OF SOLID BOUNDARY Sheng Chen-zhi, Zhang Yi-fei 1988, 5(3): 350-360.  Abstract ( )   PDF (552KB) ( )   An algorithm to compute vorticity of the micro area around the sharp turning points is developed. The comparison between the proposed method and the methods developed by Roache is given. The paper also presents the numerical tests on cavity model and the results show the efficiency of the proposed method in treatment of the singularity problem.

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NUMERICAL CALCULATION AND PHYSICAL ANALYSIS OF THE ELECTRON ENERGY DEPOSITION IN THE CYLINDRICAL KrF SYSTEM PUMPED TRANSVERSELY BY ELECTRON-BEAM Zhang Tian-Shu, Wang Zheng-Yan, Wang Xiao-Sha, Chen Dong-Quan 1988, 5(3): 361-369.  Abstract ( )   PDF (505KB) ( )   In this paper We calculated numerically the electron energy deposition in the cylindrical Ar/Kr/F2 mixtures Pumped transversely by electron-beam, using SANDYL code, Obtained the relations between energy deposition efficiency and total Pressure of the mixture, electron energy and mixture Composition ratio. Moreover, We made rough estimation of the energy deposition efficiencies of electron and proton by using the formula of the stopping power, and made the comparison of electron and Proton energy losses for the theorical simulation of Proton-beam Pumping.

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THE COEFFICIENTS OF HIGHER ORDER ADAMS FORMULAS Zhang Jia-ju 1988, 5(3): 370-374.  Abstract ( )   PDF (259KB) ( )   In this paper, the coefficients γi, γi,,βkp and βkp in the explicit and implicit Adams integration schemes (1) and (2) are calculated for 0 ≤ j,k ≤ 9 using REDUCE.lt is pointed out that there were some errors in the tabulated values of β5p in Refs.[1] and[2].

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MARLOWE——A COMPUTER S/MULATION PROGRAM IN THE BCA AND IT'S APPLICATION Zhou Peng, Pan Zheng-ving, Huo Yu-kun 1988, 5(3): 375-379.  Abstract ( )   PDF (393KB) ( )   MARLOWE is a computer program for simulation of atomic-displacement cascades in a variety of solids based upon binary-collision approximation. This paper briefs the program including it's theoretical background, approximation adopted, features and applicable scope.In addition, we outline a number of physical problems we studied with this code.