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    31 March 1997, Volume 15 Issue 1
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    Articles
    GEOMETRIZATION-NUMBER THEORY-ELIMINATINGSINGULARITY APPROACH IN THE THEORY OFELECTROMAGNETISM(IV)
    Yu QUAN, LI XINQI, ZHANG CHENG, LI HONGFANG, DAI XIANXI
    1997, 15(1):  1-8. 
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    In this paper, the GNES approach is applied to calculate the capacities of directional couplers. The high precision calculation of matrix elements and accuracy analysis are discussed.The numerical results of its capacities for different configurations(the symmetric and asymmetric,coaxal and non-coaxial double-cylinders and double elliptic cylinders) inner conductors are presented.The practical calculation shows that the GNES approach is successful in high accurate calculation with bigh speed and is the one of the best modern approaches.
    DIFFERENCE EUATIONS CONSTRUCTIONIN COMPLEX MEDIA AND APPLICATIONTO ELECTROMAGNETIC SCATTERING
    CHEN ZHINING, HONG WEI, QIAN ZUPING, ZHANG WENXUN
    1997, 15(1):  9-18. 
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    To find solutions of electromagnetic scattering in nonuniform complex media is complex and difficult. This paper establishes difference equations of elec-tromagaetic scattering problem in complex media by integral interpolation me-thod to partial differential equation. The process of modeling and FDE's constru-citron applied in electromagnetic scattering problems in anisotropic and rotary wave zaedia are given. We also analyse in terception errors of difference equations. Numerical results of typical problems show that this method is valid.

    BASIC SIGNAL BEAM SYNTHESIS OF COMPLEX SOURCE PULSED BEAM FORMED BY ARBITRARY SYMMETRIC SINGLE-PEAK TRANSIENT WAVE
    DENG SHUHUI, YIN HONGCHENG, RUAN YINGZHENG
    1997, 15(1):  19-26. 
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    This paper presents the complex source pulsed beam formed by the arbitrary symmetric single-peak transient signal of normal high-order derive-tives at the peak as the sum of basic complex source pulsed beam about series of basic signals including retangular,triangular,and half-elliptical signals of mul-tiple power function. And it uniforms the analysis formulas of the complex source pulsed beams of symmetric single-peak transient signals. And it is compared with the expression of the complex pulsed source beam diffident by the single-side fou-rier transform.
    HDTV CHANNEL CODING USING ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING
    MA JUN, WANG SHUOZHONG, ZHANG ZHAOYANG
    1997, 15(1):  27-33. 
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    This paper discusses orthogonal frequency division multiplexing(OF-DM) as a channel coding scheme for terrestrial HDTV broadcasting. The pecfor-mance of OFDM in additive white Gauissian noise, multipath and co-cbannel interference environments is studied through computer simulation. Methods for reduction of the system's bit error rate are considered.
    POLE ITERATION METHOD-A FAST AND ACCURATE ALGORITHM FOR CALCULATING FLATNESS ERROR
    LIU ZHENGSHI, ZHOU YIFANG
    1997, 15(1):  34-40. 
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    A new algorithm for minimum condition flatness error is proposed in this paper based upon the references[3] and[5].Only a few poles of every row are iterated in main computation procedure of the algorithm.Therefore,the efficiency of computation of this method is higher than those by using other methods, and it is suitable to deal with more complex problems especially.
    STUDY ON SPHERICITY MEASUREMENT AND EVALUATION OF A SPHERE BY FITTING A QUTARATIC EQUATION SPHERE
    ZHU XNUNSHENG, REN XINSHENG, LIU GUOLIANG, XUE BINGYUAN
    1997, 15(1):  41-47. 
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    This paper indicates that LSS (least square sphere) sphericity error doesn't keep invariant with respect to coordinates translation but QES (quadratic equation sphere) sphericity error can. Method which can efficiently eliminate the twice positional error as a result of turning over the sphere for its full shape test has been firstly. proposed, and the formula of QES sphericity error has been esta-blished by means of QES fitting.
    A THEORETICAL ANAL YSIS TO RECTANGULAR WORKPLACE OF THREE-DIMENSIONAL DRAWING THROUGH PARABOLIC DIE
    ZHAO DEWEN, LI GUIFAN
    1997, 15(1):  48-54. 
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    A three-dimensional kinematically admissible continuous velocity field bas been established for drawing rectangular workplace through a parabolic die. Then, applying the in tegral as a function of the upper limit and the curved surface integral, an upper bound analytical-solution of the dra wing stress has been obtained.
    THE STUDY OF SPEECH RECOGNITION USING SOM NEURAL NETWORK
    HU GUANGRUI, WU SUO
    1997, 15(1):  55-60. 
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    An optimal self-organization learning algorithm is presented in this paper. A new speech recognition system, which is based on the basis of SOM/HMM principles, bas been provided. In the system, the SOM networks are used as vector quantifier (VQ). After trained by the optimal self-organization algorithm, the SOM networks are adjusted by K-means clustering algorithm. experimental results showed that the new speech recognition method introduced in this paper can raise the recognition accuracy of the system.
    RESEARCH ON ACTUATOR ASSIGNMENT IN VIBRATION CONTROL SYSTEM
    ZHU MEILING, ZHAO CHUNSHENG, WANG FENGQUAN
    1997, 15(1):  61-66. 
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    In this paper, a method is presented for determination of actuator numbers and locations for the active vibration modal control of flexible structures. This method is based on the complex modal analysis and dynamic sensitivity analysis. It is thought that the actuator assignmentin in vibration coatrol systems should depend on natural properties of systems, but should not depend on a particular choice of initial conditions or control laws.
    RESEARCH ON THE MOTION BEHAVIOR OF IMMERSED PARTICLES IN DISCRETE MEDIUM USING STOCHASTIC DYNAMICS
    CHEN CHANGLE, YIN XINQIN
    1997, 15(1):  67-74. 
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    The motion behaiviour of difficult-to-melt particle immersed in plasma. is studied with stochastic dynamics in this paper. The Kolmogorov equation is presented and solved under reflecting -boundary condition in one-dimension half infinite space. The result conforms to the experiment data obtained at present.
    DEVELOPMENT OF A NOVEL MICRO FLOW-THROUGH CELL Ph-ISFET INTEGRATED SENSOR
    NIU NENGNIAN, DING XINFNG
    1997, 15(1):  75-81. 
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    Based on the normal IC process, micro machining technology and bonding technology, a novel micro flow-through cell pH-ISFET integrated sensor has been developed, which comprises micro flowthrough cell, four pair long-armed ISFET/REFET sensor (differential measurement) and Ti/Au film pseudo-reference electrode. The chip area and micro flow-through cell's Volumeare 8×6mm2 and 0.7×5.0×0.3mm3, respectively. The integrated sensor together with extra peristaltic pump, injection valve and measurement circuits consists of micro flow-through cell pH-ISFET FIA (flow-injection analysis) system,Experimental results show that the integrated sensor and FIA system have fast response, small sample consumption, and other features and its stability and reliability are also ameliorated.
    OPTIMIZA TION DESIGN OF TWO-POLY SILICON FLOTOX EEPROM CELL
    YU ZONGGUANG, Xu JUYAN, WANG HONGBIN, WEI TONGLI
    1997, 15(1):  82-88. 
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    In this paper, the model of two-polysilicon folotox EEPROM threshold voltage model has been established. Then, the relatioa between erase/write tbredbold voltage and erase/write time, programing voltage, tunnel area, folox thickness have been studied based on this model. Tbe two-polysilicon fotox EEPROM cell has beea designed The experiment reaults are approximately-concordant with the sizaulation results. So, the thresbold model can be used as a fast, sim ple, actual ruler for EEPROM cell optimization deaign.
    COKE DEGRADATION IN B. F WITH ULTRA COAL INJECTION RATE
    LI JZAXIN, MI KEQIN
    1997, 15(1):  89-95. 
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    According to the theory of carbon balance, it is shown that the cha-racteristic parameters of the grid coke in B. F are deteriorated with the increase of coal injection rate. lnvestigations into the effect of coke quality, solution loss, insititu-reduction and coke-melt reactions on the coke beat strength as well as increasing the ore preneduction degree and using new charging technic to restrain the coke degradtion are intraduced. With the above aim, the optimum of B. F operation under an ultra coal injection rate is discussed.
    THE ADVANTAGE OF STREAMLINE-UPWIND PETROV-GALERKIN FINITE ELEMENT METHOD FOR HYPERBOLIC SYSTEMS
    WANG LIGANG, HUA LU
    1997, 15(1):  96-100. 
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    The conventional Glalerkin finite element metbod is only applicable to discretizing elliptic equations. In many flow or heat-transfer problems, the governing equations may change type; they become hyperbolic because convection is dominating. The solutions are often corrupted by node-to-node oscillations or ‘wiggles’ the Streamline-Upwind Petrov-Galerkin finite element method can inbibit the crosswind. diffusion and improve the computational accuracy. Two aumerical exarnples are given:the flow of Oldroyd-B fluid around a sphere in a tube and the nonisothermal agitating flow When the Weissenberg number or the Peclet umber is high, the Ga]erlkin method produces,wiggles' while SUPG method yields good results.
    THE SINGLE MACHINE SCHEDULING PROBLEM WITH NUMBER OF TARDY JOBS AND CONTROLLABLE PROCESSING TIMES
    SUN SHIJIE, R J KIBET
    1997, 15(1):  101-106. 
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    For the single machine scheduling problem with number of tardy jobs and controllable processing times, Daniels and Sarin gave some results for con-trucking the tradeoff curve between the number of tardy jobs and the total crashing times, but they had not developed such an algorithm. Under the condition of all wj equal to one, this paper analyses some results given in their paper, proves the number of efficient values in the tradeoff curve. Basing on considering only on the number of tardy jobs and the method given by Daniela and Sarin, the peper develops also an algorithm for constracting such a tradeoff curve.
    INVESTIGATION OF THE PROPERTIES OF SMSC Cd1-xMnxTe CRYSTAL FILMS GROWNRFOM Te-RICH SOLUTION
    MO YAOWU, WU WENHAI
    1997, 15(1):  107-111. 
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    The receptivity, conductive type, Hall mobility and photoluminescence (PL) of semimagnetic semiconductor (SMSC) Cd1-xMnxTe crystal films grown from Te-ricb solution were measured. All these results showed that the quality and stability of crystal films grown were better than Cd1-xMnxTe bulk crystal grown by Bridgeman technique. The cause of absorptive edge existing within 0.85~1.5 μm range in infrared transmittance spectrum was investigated based on the viewpoint that the first excited state (4T1) of Mn2+3d in tetrahedral crystal field appeared in the bandgap of Cd1-xMnxTe crystal.
    HYDROTHERMAL BaTiO3 THIN FILM AND ITS MICROSTRUCTURE ANALYSES
    XU HUAPING, XIN HUOPLNG, LIN CHENGLU, JIANG FUMING, YIN QINGRUI, MENG FANDE
    1997, 15(1):  112-116. 
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    Polycrystalline BaTiO3 thin film has been synthesized on Ti-covered silicon substrate at low temperature of 160℃ by hydrothermal method. lts micr-ostructure was dense and homogeneous, with average grain size of about 100 nm by scanning electron microscopic (SEM) observations. It can be found that a multi-laver sructure has, been formed according to the comparisons on X-ray diffraction. (XRD) patterns, SEM morphologies and spread resitance profiles of the samples before and after rapid thermal annealing. And the multilayer structure of cubic BaTiO3 (a-BT)/amorphous BaTiOx (a-BT)/TIOx/Ti/Si has evolved into tetragonal BaTiO3/TiOx/Ti/TiSi/Si after annealing.
    CREEPING WAVE IN THE LOSSY MATERIAL
    WANG XILIANG, FENG YONGCHENG, SHEN LIYING, QING XIANMING
    1997, 15(1):  117-120. 
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    A new method for computing propagation constan ts kn and amplitudes an of creeping wave-modes in the lossy matrial is preseated in the paper. Tbe method combines eigenfuaction solutions of creeping wave currents with Prony method and solves the numerical computation of kn, an. For the losses material, propagation constants obtained by the method are in good agreement with those in reference[3].
    A SIMPLE METHOD FOR CALCULA TING RADIATION PATTERN OF THE RING FOCUS ANTENNA
    QI LINGFEI, YAO DEMTAO
    1997, 15(1):  121-126. 
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    The aperture field distribution of the ring focus antenna is reviewed in view of the energy conservation law, and the simple formula for calculating its radiation pattern is deduced. The method has the characteristics of clear con-cept, simple calculation formula and easy programming. lt is suitable for enginee-ring calculation and analysis of the ring focus antenna.
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Bimonthly, Founded in 1983
Editor-in-Chief:Wang Tingyun
ISSN 0255-8297
CN 31-1404/N