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25 December 1986, Volume 3 Issue 4 Previous Issue    Next Issue

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UNIVERSAL MEASURE OF ONE DIMENSIONAL UNOMODAL MAPS Wang You-qin, Chen Shi-gang 1986, 3(4): 387-393.  Abstract ( )   PDF (429KB) ( )   In this paper, the computaional method proposed in[1] is argued further and is used to compute the universal chaos measure (fraction) mc and the relation bretween the universal measure and the power of mops, Based on the results described in this paper, a simple computational method for chaos meacure is sugested.

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THE NUMERICAL SOLUTION OF QUASILINEAR FOKKERPLANCK EQUATION OF THE TOROIDAL EFFECTS Jian Guang-de, Wang Zhong-tian 1986, 3(4): 394-400.  Abstract ( )   PDF (371KB) ( )   In this paper, the quasilinear F-P equation is numerically solved by amultiple shooting method with the toroidal effects included. The plasma current density per unit power density J/Pd is calculated on the basis of the solution obtained above. Our numerical results are in qualitative agreement with those obtained from physical analysis.

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DISJOINT TREE-A NEW APPROACH FOR QUANTITATIVE ANALYSES OF NETWORK SYSTEM AND FAULT TREE Xu Han-ming 1986, 3(4): 401-408.  Abstract ( )   PDF (458KB) ( )   An approach to construct a disjoint tree for an event set is presented, in which the total number and order of terms of a cut set (path set) are decreased rapidly through the separation of independent terms and the collection of common factors. All of the branches of the disjoint tree are disjoint to one another, consequently,the occurrence probability of the top event can be obtained straightforwords. Application examples are given. The extension of the approach to the multistate systems and the approximate calculation method are discussed.

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THE WEAK-COUPLING INTERFACE POLARONS Yang Bing-chu, He Zong-qiang 1986, 3(4): 409-414.  Abstract ( )   PDF (339KB) ( )   The temperature dependence of weak-coupling interface polarons is diss-cussed by means of Bogolyubov's inequality.It is shown that the effective masses and binding energies of weak-coupling interface polaron are related to temperature, and that it only can exist in the dielectric of smaller static dielectric constant ε0 When β→0, Beril's conclusions can be obtained.

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THE COMPUTER MONTE CARLO SIMULATION IN ELECTRON BEAM EXPOSURE Wei Mao-xin, Wang Jian-kun, Qiao Yi-zeng 1986, 3(4): 415-423.  Abstract ( )   PDF (504KB) ( )   The spatial distribution of the energy deposition in polymer resist PMMAby lateral tcattering electrons is simulated with Monte Carlo method. The combination of the scattering mean free path and the constant step value is proposed, for making a compromise between the physics concept and the computer runtime.A new approch that whether or not an elastic scattering event occurs on the boundary is determined by a randum number is utilized. The graphs of both forward scattering energy deposition and backward energy deposition have been given in the present paper.

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THE MODIFIED PST ITERATIVE SCHEMES OF SOLVING THE INVERSE PROBLEMS OF WAVE EQUATION Tang Lung-ji 1986, 3(4): 424-430.  Abstract ( )   PDF (421KB) ( )   The modified PST iterative sclremes of solving the inverse problem are proposed in this papar.It is found that the modified PST dose give satisfactory results,and its computational work is less than the PST[2] iterative Schemes. Finally, the results of the numerical experiments are given.

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A ONE-DIMENSIONAL SYSTEM-GENERATED ELECTROMAGNETIC PULSE Wang Yu-zhi, Wang Tai-chun 1986, 3(4): 431-441.  Abstract ( )   PDF (555KB) ( )   In the paper, one dimensional Boltzmann equation is soluted by method of ordinary difference. Total current contained primary and second current are obtained. At the same time, numerical results of one-dimensional MP are given.

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A TWO-DIMENSIONAL SYSTEM-GENERATED ELECTROMAGNETIC PULSE Wang Tai-chun, Wang Yu-zhi 1986, 3(4): 442-454.  Abstract ( )   PDF (652KB) ( )   In this paper, relations between IE,lP (Internal Electromagnetic Pulse) and SGE MP(System-Generated Electromagnetic Pulse) are discussed.Numerical results of SGE MP are oStained under the conditions that the objects are exposed to x-rays.

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THE APPLICATION OF THE LEAKAGE ITERATIVE METHOD TO SQLIVING THE NEUTRON DIFFUSION EQUATION Zhong Wen-fa, Luo Jing-yu 1986, 3(4): 455-460.  Abstract ( )   PDF (344KB) ( )   A leakage iterative method for solving the neutron diffusion equation and its iterative process is presented in this paper. At first "analytical boundary condition" is explained. Then the metho is used in the kcalculation of reactor design. The results have been shown the leakage iterative method is satisfied in the reactor physics design.

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AN APPLICATION OF THE RTCIPROCITY METHOD TO CALCULATION OF THE RADIOACTIVE PROBLEM PRODUCED BY LINEAR ACCELERATOR Gong Ye 1986, 3(4): 461-466.  Abstract ( )   PDF (293KB) ( )   The reciprocity method is applied to the calculation of the radioactive problem produced by linear accelerator. The practical calculation indicates that the results is better than other methods. TIt is useful for the accele ration of Monte Carlo calulations, hence the method is time-saving.

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METHOD OF GREEN'S FUNCTIONS APPLIED TO LUBRICATION THEORY Han Qing-shu, Yang De-quan 1986, 3(4): 467-472.  Abstract ( )   PDF (296KB) ( )   In this paper, A method of Green's functions is used to simulate the lubrication problem of bearings numerically. Cylindrical bearing and bearing with other shaps are calculated as. examples. The numerical results are compared with analytic solutions. It is shown that the accuracy is satisfied.

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THE MONTE CARLO SIMULATION OF PRE-AMPLIFICATIVE MECHANISM OF MSAC ON THE MICROCOMPUTER Cheng Jin-rong, Zhu Hui 1986, 3(4): 473-480.  Abstract ( )   PDF (455KB) ( )   In this paper the simulation of pre-amplificative mechanism of MSAC with Monte Carlo Methods and the Method on the analogy of the actual process of physics by a microcomputer are described in detail.It provides a valuable reference for the application of microcomputers.

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APPLICATION OF CUMULANT EXPANSION IN EXAFS DATA ANALYSIS Wan Jun, Lu Kun-quan 1986, 3(4): 481-486.  Abstract ( )   PDF (342KB) ( )   It is more reasonable and accurate to use cumulant Expansion in EXAFS data analysis In this paper, the formula of cumulant expansion. for structural parameter determination is given, and the result of EXAFS data analysis on GeO2 glass is reported and compared with that obtained by conventional method.

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CONVERGENCE OF PRECONDITIONED CONJUGATE GRADIENT METHODS Hu Jia-gan, Wang Bang-rong, Chen Chuang-fei, Lin Xing-ping 1986, 3(4): 487-495.  Abstract ( )   PDF (549KB) ( )   In this paper,we analyse the rate of convergence of some precontditionedonjugate gradient methods,namely ICCG method ILUCG(k) method, ILUCG (p)method and so called "TCG method" with a number of splittings for preconditioning the coefficient matrix A of the system of linear algebraic equation to be solved under the condition that A is diagonally dominant. Several numeriical examples are given to illustrate our analysis.

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THE NUMEIRCAL CALCULATION OF DYNAMIC STRESS OF HUNGSNG CONDUCTIVE LINE IN SHORT CIRCUIT CONDITION Zhou Zheng-zhong 1986, 3(4): 496-504.  Abstract ( )   PDF (480KB) ( )   This paper used the method of distributive parameter's dynamic in[1]、[2] to calculate the phase-to-phase stress of conductive line in short circuit condition(i. e. dynamic stability). This method strictly according to the facts that conductive line as a thin beam, it's quality elasticity, resistance all was distribution. Therefore, it could depite the dynamic feature of conductive line more precisely In[3] one considered many step、elastic constrain、inner-resistance (inner friction of Aluminium material)、extra-resistance (atmospheric resistance) e. t.al. This paper considers a horizontal stress based on[3], may calculate stress of dynamic state and inverse stress of dynamic state of fulcrum.The mathematical problem, which was depicting above physical problem, was a partial differential equation of parabolic type in five orders. This paper get a numerical solution that could use difference method. Numerical results shows:when the conductive line in short circuit condition was increasing a little horizontal stress, (constract with other quatity), the numerical results only has a little shift.This paper also analyze the computational stability condition of explicit difference schme. It's results shows:when increasing a horizontal stress, the computational stability condition as same as before.