Table of Content

30 September 1992, Volume 10 Issue 3

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Articles

MYOCARDIAL INFARCTION MATHEMATICAL MODELLING AND CLINIC

O. M. BELOTSERKOVSKII, A. V. VINOGRADOV, A. S. GLAZTJNOV

1992, 10(3):  189-198. 

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This paper describes the formation and growing mechanism of Myocardial Infarction (MI), and discusses the MI Diffusion Model and the MI Dynamics Model of a Biochemical I'ferment in the Blood. The clinical valuations of these models have been proved through experiments.

A STUDY OF DEFECTS FROM ELECTRON IRRADIATION IN N-TYPE LPE AND VPE-GaAs LAYERS

HU YUSHENG

1992, 10(3):  199-205. 

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In this paper, using deep-level transient speotroacopy (DLTS) and surface photo voltage (SPV), the defects induced by different doses of electron irradiation with 1 MeV of energy in the N-type LPE and VPE-GaAs layers, and their isochronal annealing behavior at temperatures ranging from 400 K to 550 K have been systematically studied. The variations of defect concentration N_T are discussed as the electron radiation dose increases and after isochronal annealing takes place. And it is shown that the main recombination centre level among all the defect levels induced by electron radiation can be identified according to the L²/D-N_T^-1 graph.

GEOMETRIZATION NUMBER THEORY-ELIMINATING SINGULARITY APPROACH IN THE THEORY OF ELECT ROM AGNETISM (Ⅲ) Symmetry Analysis and the Analytic Expressions of Capacity and Induction Coefficients for Cylindric Symmetry Model

DAI XIANXI, LI HONGFANG, LL XINQI, ZHENG YIZHUANG, ZHONG WANHENG, HUANG JINYI, DAI JIQIONG

1992, 10(3):  206-214. 

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In this paper a systematic symmetry analysis is made for the ONES approach. It is pointed out that for the configurations possessing up-down and left-right symmetries simultaneously, the number of independent matrix elements will foe reduced to 1/8 of the original. In this paper the exact analytic expressions of the capacity and electrostatic induction coefficients in the oylindrio Symmetry model for the directive coupler are also given. These expressions can be used as the primary approximation and numerical calculation standard of the GNES approach.

THE STUDY OF PREPARATION OF SPINDLE-TYPE HEMATITE PARTICLES

ZENG HUANXING, REN FUMIN

1992, 10(3):  215-220. 

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This paper studied the effective factors for the preparation of spindle-type hematite particles by forced hydrolysis of ferric nitrate at elevated temperatures. A small quantity of phosphate ions were added into such a system before ageing. It was found that spindle-type hematite particles could be obtained in high ferrio nitrate concentration within a shorter preparation time, which is advantageous for the realization of the production of NP magnetic particles by a new preparation way.

RESEARCHES ON AND APPLICATIONS OF BLANKING DEFORMATION MECHANICS OF METAL SHEET

LU XLANFBNG

1992, 10(3):  221-226. 

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In this paper, the newest research results on the blanking deformation mechanics of metal sheets are simply and systematically introduced. We measured a real blanking curve, found the blanking deformation mechnical process to be composed of 6 stages, and obtained a formula of function between a unit blanking pressure and sheet metal hardness. Their applications are reported.

THE STUDIES OF POLARIZATION BEHAVIOR ON SEMICONDUCTOR ELECTRODES

TANG MINGWEI, XU MIN, ZHANG HENGHUA

1992, 10(3):  227-232. 

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The theoretical concepts of polarization behavior of the Fe (ON)₆^4-/Fe(ON)₆^3- redox couple on semiconducting electrodes in a boric acid/sodium borate buffer solution are discussed in this paper. The concentration polarization is considered to determine the overpotential parameters of the redox couple through a study of polarization curves of a semiconducting electrode polarized by linear. sweep potential. It is found that a part of the overpotential occurs in colored films on stainless steel. In addition, the mechanism by which the charge transfer reaction proceeds on films is also approached.

THEORY OF ISOTHERMAL CHARGE AND DIRECT DETERMINATION OF TRAP DISTRIBUTIONS IN SOLID DIELECTRICS

YANG BAITUN, TU DEMING, LIU YAONAN

1992, 10(3):  233-240. 

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In this paper, an equation of isothermal charge is derived for the direct determination of trap distribution in solid dielectrics according to the model of first-order trapping. Based on the configuration of distribution of space charges in solid dielectrics formed by the field emission, a method is suggested for distinguishing the electron from hole traps in the dielectric by using the surface potential technique. Therefore, the information of a single carrier trap is acquired. The parameters of traps in the dielectric PP is obtained by integrating theory with experiment. The theory and the testing method are of importance for studying the traps in solid dielectrics.

INVESTIGATION ON PREPARATION OF p-n JUNCTION OF LARGE AREA BY IRRADIATION DOPING AI OR Sb IN Si USING 10.6 μm INFRA RED LASER

ZHONG TAO, LIN LIBIN, PAN ANFU

1992, 10(3):  241-246. 

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The preparation of p-n junctions of large area (maximum area φ20 mm) by irradiat ion doping Al and Sb in N and P type crystals Si respectively using high-energy pulse infra-red laser (wavelength=10.6 μm) is carried out. It is found that there is a threshold energy density in laser doping, and distributions of dopant density an d depth have relation to preheat temperature and plating layer thickness of the impurities. Volt-ampere characteristics, thin-layer resistance and photvoltage of the p-n junction are measured.

COEFICIENTS ACQUISITION IN DATABASE SYSTEM

WU XINDONG, WANG HAO

1992, 10(3):  247-251. 

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This paper introduces the coefioients acquisition and processing module (CP) in the KESHELL Ⅱ system. The regression, fitting and other mathematical methods are adopted to acquire the function expression of numeric attributes from the object database. The DBA can describe the virtual numeric attributes in explicit functions by the OP module.

THE STUDY OF PHASE CONFIGURATION OF M2 HIGH SPEED STEEL BY BACKSCATTERING MOSSBAUER EFFECT

ZHANG HENGHUA, MA RUZHANG, SU SHIZHANG, JIN HUIJIAN, CHANG RUQIN, XU GUIQIN

1992, 10(3):  252-258. 

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The phase configuration of M2 high speed steel was studied by the Mossbauer effect in backscattering X-ray geometry. It was shown that the effect of substitutive alloy atoms in the near shell in the high speed steel on the effective ferromagnetic field can approximately be considered to be identical. So there are only four kinds of iron surroundirgs in mertensjte based on the alcove results, i.e., there are four kinds of iron surroungings corresponding to 0,1,2 and 3 substitutive alloy atoms in the nearest two shells respectively. The carbon atom in the retained austenite of M2 high speed steel is located at,the octahedral site and w ill segregate to the retained austenite phase during high temperature quenching.

STUDY ON THEORY FOR ECCENTRIC CIRCLE AND LEAST SQUARE CIRCLE

ZHU XUNSHENG, XUE BINYUAN

1992, 10(3):  259-264. 

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A strict equation of eccentric circle is offered in this thesis. Using this equation we get the expression of the coordinates of the least square circle center which is similar to the conventional formula, and the expression of the least square circle radius which is more precise than the conventional formula. Furthermore a formula of the value of roundness is offered in the sense of least square statistics and it is verified that it has nothing to do with the D. 0 component and the primary harmonic wave of the curve.

RESEARCH ON THE REPRESENTATION STRUCTURE OF KNOWLEDGE-BASE AND SOLVING ALGORITHM IN THE REAL-TIME CONTROL EXPERT SYSTEM

ZHENG DELING, LIU HONGCAI, XU GUANGXIN

1992, 10(3):  265-272. 

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This paper introduces an expert system in the real-time control for the after-blow operation in converter steelmaking with oxygen. Special attention is paid to the research on the representation structure of the knowl edge-base and the relative inference algorithm.
A two-time mapping model for the solution is formed. An improved opportunity inference approach in the problem is employed, instructed by the means-end analysis with heuristic information and metarules. In this way, the production system has parallel processing performance, and the expert system has a high adaptability.

Research Notes

STEADY RESPONSE OF AN ANNULAR CRACK IN AN INFINITELY LONG HOLLOW CYLINDER WITH ELASTIC WAVES

ZHANG ZIMAO, ZHOU ZHENZU, WANG DUO

1992, 10(3):  273-278. 

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In this paper, an analysis of the interaction of steady longitudinal waves with an annular part through a oraok located in an infinitely long hollow cylinder has been investigated. Using the integral transform technique, the problem is reduced to a second kind of Fredholm integral equation, which is then solved numerically. And finally, the feature of displacements at the far-field has been discussed in detail.

METHOD AND ANALYSIS FOR THE ROLLING CONTACT PROBLEM OF A VISCOELASTO CYLINDER

TANG GUOAN, PU KUIYING

1992, 10(3):  279-282. 

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The rolling contact problem of a visooelastic cylinder is studied in the paper. This problem is governed by a variational inequality equation, (K_g, r-g) ≥ 0 for any r in convex set K⊂Rⁿ. Unlike that in the case of elastic media, the stiffness matrix K is composed of a positive definite matrix and an anti-symmetric matrix. The authors first prove some useful properties about the solution of the equation, and then provide a numerical solution scheme to solve this equation.