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25 September 1986, Volume 3 Issue 3 Previous Issue    Next Issue

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ASED-MO STUDY OF ACTIVATION ENERGIES AND DIFFUSION COEFFICIENTS OF Cu ON Pt SURFACES Cao pei-lin, Shi Dan-hua 1986, 3(3): 255-262.  Abstract ( )   PDF (481KB) ( )   Using the ASED-MO method, the chemisorption and surface diffusion of Cu on Pt (111), (100), (110) are studied.The activation energies and the diffusion coefficients at 300K. of Cu atoms on these three Pt Surfaces are 0.167eV, 0.162eV, 0.667eV and 3.04×1010m2/s,3.69×10-10m2/s,2.42×10-18m2/s respectively. It is Shown that,the activation energies are rather small and Cu atomes have a high mobility on Pt (111) and (100) Surfaces;But on Pt(110),the activation energy is comparatively large and the diffusion eoefficient is small.

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THE DIFFUSION-SYNTHETIC ACCELERATION METHODS FOR THE ONE-DIMENSIONAL SPHERE GEOMETRY NEUTRON TRANSPORT EQUATION Zhao Yu-jun 1986, 3(3): 263-275.  Abstract ( )   PDF (656KB) ( )   An diffusion Synthetic acceleration equation and differencing scheme (DSA) for the diamond scheme of the one-dimensional sphere geometry steady neutron transport equation is introduced in this report.The acceleration methods can accelerate iteration solution for the transport equation of the diamond scheme. Some numerical results of several model are given.

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STUDY OF THE MAGNETIC EFFECT FOR RELATIVISTIC ELECTRON-BEAM INTERATION WITH HIGH Z PLASMA FOIL Wu Dang-shi, Jin Ru-bi, Wu Shang-qing, Wan Gui-rong 1986, 3(3): 276-286.  Abstract ( )   PDF (599KB) ( )   In this paper,using the reduced Fokker-Planck equation[1] with limited-flow diffusion and Morshak boundary condition[8] and conpled with fluid dynamical code,we studied Magnetic effect of Relativistic Electron-Beam interation with high Z plasma foil.which are in agreement with references[1],[2].

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INTERNAL ELECTROMAGNETIC PULSE PRODUCED BY PROMPT-γ PHOTONS WITHIN CAVITY OF THE CYLINDER Wang Tai-chun, Zhou Guang-yi, Wang Yu-zhi 1986, 3(3): 287-298.  Abstract ( )   PDF (641KB) ( )   In this Paper, we discussed Physical Priciple of the non-self-consistent methods, calculated and analyzed internal electromagnetic pulse produced by Prompt-γ photons within cavity of the cylinder under the conditions of nuclear explosion.

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THE APPROXIMATED SOLUTION OF ONE-WAY WAVE EQUATIONS BY FINITE ELEMENT METHOD Sun Che, He Bo-rong, Guo Xian-zhong, Yang Cheng-xin, Liu Qi-yin 1986, 3(3): 299-310.  Abstract ( )   PDF (1005KB) ( )   In this Paper the finite eclment-finite difference method is used to solve numerically two problems of 15-degree and 45-degree one-way wave equations For 15-degree one-way wave equation we have obtained the seismic profile when linear elements and quadratic elements are used, It has been proven that the linear element method is the Claerbout difference method.

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THE APPLICATION OF THE SYNTHESIS METHODS TO REACTOR PHYSICS ANALYSIS Luo Jing-yu, Znong Wen-fa 1986, 3(3): 311-323.  Abstract ( )   PDF (644KB) ( )   The synthesis method is presented in this paper, A synthesis eauation has been derived by the weighted residual method for the neutron diffusion equation in R-Z geometry, A approach for solving the synthesis equation is described. The reuslts have been shown that compared with the finit differential method, calculait time in synthesis method is decreased.

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LASER (I=1014-1015wcm-2,λ=1.06μm) PLASMA HEATING DUE TO PARAMETRIC LNSTABILITIES Zhang Jia-tai, Liu Cheng-hai, Li You-min, Xu Lin-bao, Zhang Shu-gui 1986, 3(3): 324-334.  Abstract ( )   PDF (614KB) ( )   In this paper we study the laser plasma turbulent heating due to parametric instabilities by the numerical simulation method based on one and a half-dimensional cloud-in-cell scheme.The computer simulation results show that linear growth rate of the parametric instabilities is in reasonable agreement withthe theoretical predic tion. We also give the computer simulation results on no-nlinear heating rate,the heated electron distribution function,the ripple surfaceof the critical density and the caviton, These results are discussed.

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THE ROTATION ABOUT A FIXED POINT OF THE DEFORMABLE BODY AND ITS NUMERICAL SOLUTION Li Zeng-ling, Gao yu 1986, 3(3): 335-344.  Abstract ( )   PDF (527KB) ( )   The rotation about a fixed point of the deformable body has been attented in the area of gymnastics and spacecrafts nowadys. It is the extension of the Rotation about a fixed point of the rigid body. In this paper first order differential equitions are derived from the genaral low of angular momentum, and the numerical solution and some graphic expressions of the motion are conveniently obtained with the help of the microcomputer. Two examples are used to expeain how the numerical methods are applicatod.

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FINITE ELEMENT METHOD FOR SOLVING FREDHOLM-Ⅱ EQUATION WITH CONTINUOUS KERNELS AND ITS APPLICATION IN LASER PHYSICS Zhang Guo-zhu, Wu Bai-shi 1986, 3(3): 345-354.  Abstract ( )   PDF (565KB) ( )   This paper puts forward the finite element method for solving the Fredholm-Ⅱ equation with continuous kernels. The numerical results of loworder modes obtained by applying this method to the practical problems of optical resonators with infinite strip plane mirrors, inclined strip plane mirrors and circular mirrors are same as that obtained by using the Fox and Li's method.Moreover,by applying this method, we have gbtained some unpublished field distributions and diffraction loss curves of many high-order modes.

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FITTING A MAGNETIC FIELD IN CYLINDRICAL COORDINATES Hu You-hua 1986, 3(3): 355-368.  Abstract ( )   PDF (692KB) ( )   This paper presents a model of a magnetic field in cylindrical coordinates. When BZ is measured on the boundary of the magnetic field, the magnetic field inside the cylinder can be computed to high precision by Fourier fit. The results obtained from the computing program based on this model agree with expe-remental measurements well.

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PROCEDURE FOR THE EVALUATION OF THE MULTIPLE INTEGRATION BY THEORY OF NUMBER Zhu Yong-kang 1986, 3(3): 369-374.  Abstract ( )   PDF (307KB) ( )   FORTRAN procedure for computing multiple integration by theory of number is compiled.More than one s-dimension integrals with same limit of integration (definite or varying limit) and defferent integrand (including discotinuous function) can be computed simultaneously.

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DEALING WITH THE PROBLEMS OF ION IMPLANTATION BY COMPUTATION PHYSICS METHOD(PART 1)——THE CALCULATION ON RANGE AND ENERGY DEPOSIT IN AMORPHOUS TARGETS Xu Huai-qi, Wei Mao-xin 1986, 3(3): 375-382.  Abstract ( )   PDF (456KB) ( )   A computation physics method is used here to deal with the problems of ion implantation.The Monte Carlo method is adopted as the simulated method.All complicated structure and component targets can be classified to three type of probability function formulations,Then, by direct Sampling method, ion implantation problems in those targets can be fransformed to the same problems in the simple average and single element targets,So, any type of complicated ion implantation problems can be calculated easely.A experienced formulation about how to determine the maximum impact parameter is also given here in this article.