1992 Vol.10

Please wait a minute...


For Selected: Download Citations EndNote Ris BibTeX Toggle Thumbnails

Select

ITERATIVE AND FINITE DIFFERENCE METHODS FOR SOLVING A SYSTEM OF NONLINEAR ELLIPTIC EQUATIONS GUO BENYTT, JOHN J. H. MILLER Journal of Applied Sciences    1992, 10 (1): 1-24.   Abstract （365）      PDF（pc） （1310KB）（120）       Knowledge map    Save Iterative and finite difference methods are proposed for a system of nonliear elliptic equations. The existence of solutions and error estimations of approximate solutions are proved. The numerical results support the.analysis. Related Articles | Metrics | Comments（0） Cited: Baidu(5)

Select

THE TEMPERATURE DEPENDENCE OF THE TWO-DIMENSIONAL POLARON EFFECTIVE MASS WANG ZONGGANG, GU SHIWEI Journal of Applied Sciences    1992, 10 (1): 25-30.   Abstract （458）      PDF（pc） （368KB）（116）       Knowledge map    Save The properties of a two-dimensional polaron in the polar crystal is discussed by means of a model which takes account of the atomicity of the lattice. The lattice vibration and the interaction between the electron and the lattice displacement are treated by the second quantization method. The self-trapped energy, the effective mass of the two-dimensional polaron, and the temperature dependence of the two-dimensional polaron effective mass are derived. Related Articles | Metrics | Comments（0）

Select

THE SAMPLING RULE FOR CALCULATING THE LEAST SQUARE REFERENCE CENTER AND ROUNDNESS ERROR ZHU XUNSHBNG, XUE BINYUAN, BEI JIYAO Journal of Applied Sciences    1992, 10 (1): 31-37.   Abstract （395）      PDF（pc） （431KB）（98）       Knowledge map    Save This paper discusses the number of sampling points necessary for representing the roundness error of a closed curve without distortion. Through mathematical deduction by the authors, the relationship between the center coordinates of a least square circle of a curve with statistical roundness error and its Fourier coefficients is obtained. Then the sampling rule which must be obeyed is acquired, and the verification results of the test problem and practical periphery are given. Related Articles | Metrics | Comments（0） Cited: Baidu(1)

Select

UNIQUENESS AND ACCURATE SOLUTION OF ROUNDNESS ERROR ACCORDING TO THE MINIMUM CONDITION MAO YOUGEN Journal of Applied Sciences    1992, 10 (1): 38-42.   Abstract （366）      PDF（pc） （300KB）（79）       Knowledge map    Save This paper makes an inquiry into the characteristics of the mathematical model for solving the roundness error according to the Minimum Condition. It is shown that the solution of the mathematical model is unique. And this paper also shows some different kinds of thinking and methods for solving the accurate solution. Related Articles | Metrics | Comments（0） Cited: Baidu(1)

Select

A NUMERICAL INVERSE METHOD FOR DETERMINING FILM PARAMETERS OF UNIAXIAL ANISOTROPIC FILM WITH ELLIPSOMETER ZHU KONG, WEI YU Journal of Applied Sciences    1992, 10 (1): 43-48.   Abstract （326）      PDF（pc） （375KB）（82）       Knowledge map    Save A numerical Inversion method of ellipsometry has been developed for determining optical constants and thickness of the uniaxial anisotropio film, the optical axis of which is perpendicular to the film surface. The method of changing film thickness has been proposed to obtain multiple independent ellipsometrio equations for the separate calculation of optical constants and thickness of the film, and reduce the three-parameter problem to a two-parameter one. A flow chart of the numerical inverse program is given and an example applied to L-B films is illustrated. Related Articles | Metrics | Comments（0）

Select

THE SYSTEM OF SOLID SPECIFIC HEAT MEASUREMENT WITH SCANNING METHOD AND ITS ANALYSIS ZHOU CHENGHAO, ZHANG YIBING, CH. SAJJAD AHMAD, EUAN MEIPING, JIN BIANJUN Journal of Applied Sciences    1992, 10 (1): 49-52.   Abstract （367）      PDF（pc） （262KB）（83）       Knowledge map    Save This paper introduced and analysed the experiment system for measuring solid specific heat with the scanning method. Using the experiment system, we measured the specific heat of the copper of 99.7% purity. Its data showed its deviation between 80K and 260K is less than,l% from the National Standard Reference Data System. Related Articles | Metrics | Comments（0） Cited: Baidu(4)

Select

THE THEORY OF SEPARATION EFFECT OF PLATE ELECTRODE GRADIENT FIELD YANG TIQIANG, LIANG DAOMING, LIANG YUNZHANG Journal of Applied Sciences    1992, 10 (1): 53-56.   Abstract （313）      PDF（pc） （246KB）（74）       Knowledge map    Save The article expounds in theory that the plate electrode gradient field has a remarkable separation effect on the mixtures of different electric oharaoters.lt is found that to use the plate electrode gradient field is an ideal and feasible eleotrio separation technique. Related Articles | Metrics | Comments（0）

Select

THE COLOR FOR TV AND THE COLOR VISION IN LOW BRIGHTNESS OUYANG XITONG, GAO SHUXIANG Journal of Applied Sciences    1992, 10 (1): 57-62.   Abstract （375）      PDF（pc） （426KB）（75）       Knowledge map    Save In this paper the approximate and brief spectral luminous efficiency curves and ohromaticity diagrams for mesopio vision are given. With these, it is easy and convenient to explain the main reasons for the color change of bodies and for the color distortion of TV in. low illuminance or low brightness. Related Articles | Metrics | Comments（0）

Select

THE SECOND ORDER BEAM OPTICS OF A DIPOLE MAGNET WITH A SYMMETRY PLANE HU NAIXIONG, XIMEN JIYB Journal of Applied Sciences    1992, 10 (1): 63-70.   Abstract （422）      PDF（pc） （428KB）（80）       Knowledge map    Save This paper gives the expression of the vector potential produced by a dipole magnet with a symmetry plane. The second order trajectory and second order aberration are obtained by using the variation theorem. It is verified that Liouville's theorem still holds under such circumstances. The beam ellipsoid deformed by second order aberration becomes a new ellipsoid after appropriate modifications, and still works according to first order transport theory. The seuond order beam optics is therefore established. Related Articles | Metrics | Comments（0）

Select

TWO-DIMENSIONAL NUMERICAL ANALYSIS OF THE NARROW-GATE EFFECT YANG BIAO, JI CHJAOREN Journal of Applied Sciences    1992, 10 (1): 71-77.   Abstract （332）      PDF（pc） （425KB）（79）       Knowledge map    Save The two-dimensional numerical analysis using constant approximation, obtained by Chung and Sah, has been improved by adopting the mobility model. It is found that the slope of the oonduotanoe-gate voltage curve changes from increase to decrease with increasing gate voltage, and the narrow-gate shift of the threshold voltage is larger than that obtained from constant mobility approximation. A new model is proposed here to predict the narrow-gate shift of the threshold voltage. When the conduotanoe-gate voltage characteristics of one narrow-gate MOSPET and one wide-gate MOSFET are got from 2-D numerical analysis or experimental measurement, the threshold voltage shift of any other.narrow-gate MOSFET can then be determined subsequently. This model is checked -and agrees well with the 2-D numerical and experimental results. Related Articles | Metrics | Comments（0）

Select

A SYSTEM FOR CHARACTERIZATION OF SEMICONDUCTOR MATERIALS USING SCANNING PHOTOLUMINESCENCE ZONG XIANGFU, WENG YUMIN, LIU SONG, QIN XI Journal of Applied Sciences    1992, 10 (1): 78-84.   Abstract （392）      PDF（pc） （2806KB）（82）       Knowledge map    Save In this study, the authors describe a computer-controlled scanning photoluminesoenoe (PL) system which has been designed for mapping PL intensities of semiconductor wafers or epitaxial layers up to 3 inches in diameter. Sample materials included Si, GaAs and so on. It can be used for investigation to detect defects and shallow impurities, and to show their distributions in semiconductor materials. PL is paiticularly sensitive for identifying impurities and mapping wafers to determine the distribution of defect densities over the surface of a wafer. Information from spectra and wafer maps is presented and discussed. The present scanning PL technique can be used as a simple, nondestructive, but sensitive tool in evaluating the uniformity of the near-surface layer of semioonduotor substrates and, therefore, is ideally suited for device characterization. Related Articles | Metrics | Comments（0） Cited: Baidu(1)

Select

CATALYST PRERATION OF POLYMER BOUND RUTHENIUM (Ⅲ) COMPLEXES CONTAINING BINUCLEAR LIGANDS AND ACTIVITY OF CATALYTIC HYDROGENATION ZHAO WEIJUN, WANG LING, ZHANG SHUJI, FANG YANQUAN Journal of Applied Sciences    1992, 10 (1): 85-94.   Abstract （336）      PDF（pc） （502KB）（81）       Knowledge map    Save With Chloromethylated polystyrene divinylbenzene as a support, the funotionalizened polymers containing N-P, N-0, or N-N binuelear ligand were pi-epared. These functionalized polymers were chemically bound with RuCl3 forming supported catalysts. Used in the hydrogenation of Diketo-alcohol the catalysts displayed high activity and selectivity. Related Articles | Metrics | Comments（0）

Select

GROWTH OF TITANIUM NITRIDE FILMS BY DYNAMIC ION BEAM MIXING AND INVESTIGATION OF THEIR PROPERTIES WANG XI, LIU XIANGHUAI, ZHENG ZHIHONG, HUANG WEI, ZOU SHICHANG Journal of Applied Sciences    1992, 10 (2): 95-100.   Abstract （467）      PDF（pc） （1831KB）（106）       Knowledge map    Save Titanium nitride films were prepared by simultaneous vacuum deposition of titanium and nitrogen ion beam bombardment with an ion energy of 40 KeV.RBS analysis showed that nitrogen ion bombardment could clearly reduce the oxygen concentration in the film. At the same atomio arrival ratio, the component ratio (N/Ti) in the films decreased with the increase of titanium deposition rate or sample temperature. This fact was considered to have arisen from the situation that the film composition was strongly affected by the adsorption of nitrogen. The films wore mainly TiN polyorystale. The preferred crystalline orientation of the film changed from <111> to <200> with the increase of the atomic arrival ratio (N/Ti). The titanium nitride films formed by dynamic ion beam mixing exhibited good and tear resistance and strong adhesion to the substrate. Related Articles | Metrics | Comments（0） Cited: Baidu(2)

Select

PYROELECTRIC EFFECT IN LIQUID CRYSTAL LANGMUIR-BLODGETT FILMS FANG JIYU, WEI YU, SUN ZHENQMIN Journal of Applied Sciences    1992, 10 (2): 101-105.   Abstract （402）      PDF（pc） （998KB）（82）       Knowledge map    Save The noncentrosymmetric liquid crystal LB films were prepared by the horizontal lifting method. Optical absorption spectra and morphological observation showed that aggregates of liquid crystal molecules were formed in the LB films. In order to observe the pyroeleotrio effect in the polar LB films, the Al LB film Al structure was fabricated. The static pyroeleotrio coefficient was of the order of 10-11.cm-2·K-1. The influence of the change of the LB film structure on the pyroeleotrio coefficient was discussed based on the experimental results. Related Articles | Metrics | Comments（0）

Select

COMPLEX RAY FIELD IN LOSSY MEDIA RUAN YINGZHENG, DU HUIPING Journal of Applied Sciences    1992, 10 (2): 106-112.   Abstract （344）      PDF（pc） （1075KB）（90）       Knowledge map    Save As an asymptotic solution of the wave equation at high, frequency, the complex ray field in lossy media is discussed in detail, and oompai'ed with the case of lossless ones. From these discussions, it is found that the Gaussian beam can also be effectively expressed by the complex ray field in lossy media, and the complex ray approaches developed in the lossless case can also be used in the lossy case. As an example, we give the ROS results obtained by both theoretical and experimental methods for a conducting flat plate with one surface coated with radar absorbing materials. Their good agreement shows the extension of complex rays from lossless media to lossy ones is reasonable. Related Articles | Metrics | Comments（0） Cited: Baidu(10)

Select

VARIATIONAL SOLUTION OF RESONANT CAVITY FILLING ANISOTROPIC PLASMA LIU KAI, ZHANG WENXUN, YING JIMIN Journal of Applied Sciences    1992, 10 (2): 113-120.   Abstract （316）      PDF（pc） （455KB）（68）       Knowledge map    Save In this paper, a universal variational equation for solving electromagnetic boundary problems is deduced from Maxwell's equations. It has the advantage that the trial functions are not restricted by the boundary condition. So it is especially useful in solving problems of anisotropio medium of irregular geometry. The resonant characteristics of plasma-filled cavities are analysed by using the Rayleigh-Ritz method. The numerical results in the case of rectangular cavity are in agreement with those from reference[3]. Besides, the resonant frequencies and Q values of quasi-TEm and quasi-TM011 modes are calculated as the functions of plasma parameters, which are of value in the industrial applications of plasmas. Related Articles | Metrics | Comments（0）

Select

NON-INVASIVE TECHNIQUE FOR DETECTION OF SHBE AND ITS EVALUATION FOR CLINICAL APPLICATION WANG BAOHUA Journal of Applied Sciences    1992, 10 (2): 121-127.   Abstract （536）      PDF（pc） （496KB）（80）       Knowledge map    Save The methods of surface detection of His bundle activity can be generally divided into two kinds. One method uses the technique of serial signal averaging which requires digital averaging of 50-100 sequential cardiac cycles. But it can not record the His bundle signal on a beat-by-beat basis and so it is not effective in clinical applications in that some diseases such as arrhythmia, AV block and less-then-oonstant RR intervals ooour intermittently instead of in every cardiac cycle. The other method can avoid the disad ventages of serial signal averaging by using multiple parallel inputs with amplifications. The real-time detection of the His bundle activity on a beat-by-beat basis can be achieved. Because of this advantage, the latter method deserves much attention.This paper describes the study of the His bundle activity detection based on the parallel averaging technique in the institute of BME of SUST, and its evaluation for clinical applications. Related Articles | Metrics | Comments（0） Cited: Baidu(1)

Select

EFFECTS OF INTERP ARTICLE INTERFERENCE IN SMALL-ANGLE X-RAY SCATTERING GUO OHANGLIN Journal of Applied Sciences    1992, 10 (2): 128-136.   Abstract （383）      PDF（pc） （590KB）（61）       Knowledge map    Save According to the small-angle X-ray scattering theory, it is always assumed that the scattering intensities of particles are simply added up to give the total diffraction pattern. This is true only for a very dilute particle system. However, with increasing concentration, some effects of interpartiole interference should be expected. Several models and theories of interpartiole interference have been presented but no rigorous solution can be given so far. In the practical case, the magnitude of the concentration effects can be seen by plotting the scattering curves of the various concentrated particle systems, normalized to unit concentration. Sometimes it is impossible to measure a series of concentrations in the applications of materials science, such as determining the size distribution of a mioro-inhomogeneous region, global droplets of spinodal decomposition, precipitation of the second phase, condensation of vacancies and defects in bulk materials. Therefore, it is of importance to find an empii-ical equation of the interference function. The intensities of ultrafine MoSs samples in several concentrations at different angles are determined in detail. The empirical equation of the interference Junction is deduced as:K-1=[1+2.5ω1.4+2θ° (15.4ω0.5-23.6ω2-1.3ω0.01)]-1. Related Articles | Metrics | Comments（0）

Select

THE TEMPERATURE EFFECT OF NiCr-NiCu THERMOCOUPLE UNDER PRESSURE HUANG TONGKAI, GU JINMO, CH. SAJJAD AHMAD, JIN BIANJUN Journal of Applied Sciences    1992, 10 (2): 137-140.   Abstract （354）      PDF（pc） （271KB）（76）       Knowledge map    Save The pressure effect on the NiGr-NiCu thermocouple was measured at room and liquid nitrogen temperatures up to 20 kilobar. The results showed that the pressure effect on the thermo-emf of this thermocouple was enhanced by the pressure. From 0 to 20 kilobar and in the accuracy of 0.1 Kelvin the pressuer effect on the thermo-emf did not affect the temperature measurement. Related Articles | Metrics | Comments（0） Cited: Baidu(1)

Select

ROSIM ROBOT SIMULATION SYSTEM AND ITS APPLICATION DENG JIANYI, ZHANG ZONGMINO Journal of Applied Sciences    1992, 10 (2): 141-147.   Abstract （672）      PDF（pc） （873KB）（75）       Knowledge map    Save With the increasing speed of the computer and its graphic development, CAD status is more and more outstanding in robot research. A number of studies and software of OAD are presented annually. These achievements have played an important role in robot research, design and so on. This paper deals with a robot simulation system EOSIM that runs on the miorooomputer. The system is not only a digital simulation, but also a 3D graphic one. The application of the software is divided into two levels to meet different needs. The design outline and structure about the simulation system and some typical examples are presented. Related Articles | Metrics | Comments（0）

Select

AN UPPER-BOUND THEORETICAL SOLUTION TO STRIP ROLLING ZHAO DEWEN, LI GUI Journal of Applied Sciences    1992, 10 (2): 148-154.   Abstract （306）      PDF（pc） （377KB）（64）       Knowledge map    Save The two-dimensional velocity and strain rate fields which are different from Avitzur's have been deduced in this paper. An analytical upper-bound power to strip rolling has been obtained by using the integral as a function of the upper limit and the integration which depends on a, parameter without any mathematical ^simplification. The solution is compared with Avitzur's cylindrical coordinate solution. Related Articles | Metrics | Comments（0） Cited: Baidu(6)

Select

APPLICATION OF PATTERN CLASSIFIED MAPPING TO MODELING IN INDUSTRIAL OPTIMIZATION LIXJ MIAOXIU, CHBNG ZHAONIAN Journal of Applied Sciences    1992, 10 (2): 155-160.   Abstract （285）      PDF（pc） （392KB）（73）       Knowledge map    Save In tkis paper the pattern classified mapping is applied to modeling technological processes in industrial optimization. A numerical example of carbonization process in an aluminium-making plant indicates that the PRESS (Prediction Error Sum of Squares) of the model from our method is lower than that from conventional regressions, and the predictor derived from the present work is more robust. Related Articles | Metrics | Comments（0） Cited: Baidu(1)

Select

GROWTH OF Zn1-xMnxSe FILMS BY HOT WALL EPITAXY ON GaAs SUBSTRATE WANG JIE, LU HONGQIANG, SHEN JUN, LI ZHESHEN, WANG JIANBAO, SHEN XIAOLIANG Journal of Applied Sciences    1992, 10 (2): 161-166.   Abstract （381）      PDF（pc） （333KB）（71）       Knowledge map    Save Zn1-xMnxSe films are grown on the (100) GaAs substrate by hot wall epitaxy. The films are studied by X-ray diffraction, Raman and AES. The results show thai Single crystal (100) Zn1-xMnxSe films have been gotten and that x can be up to 0.17. Related Articles | Metrics | Comments（0）

Select

A NEW MODEL FOR THE MECHANISM OF SILICON BIAS-DEPENDENT ETCHING AND HEAUILY DOPED ETCH-STOP LIN HAIAN, ZHANG JIAWEI, CHEN JIAN Journal of Applied Sciences    1992, 10 (2): 167-173.   Abstract （422）      PDF（pc） （434KB）（69）       Knowledge map    Save In this paper, the dependence of anisotropic silicon etching on bias-voltage and the influence of heavy doping are studied in detail. Two models of liquid-semiconductor contact energy band and transport of interface changes are set up. The concept of reaction implantation is put forward. Meanwhile, it is considered that the etching rate usually depends on the filling conditions of the interface state. The relations of experimental etching rate and bias-voltage are explained correctly. Finally, after considering the recombination of disequilibrium carriers, the etching rate carrier concentration formula is found to be in good agreement with experimental data. Related Articles | Metrics | Comments（0）

Select

THE CHARGE STORAGE AND TRANSPORT OF POLYTETRAFLUOROETHYLENE (PTFE) ELECTRET XIA ZHONGPU Journal of Applied Sciences    1992, 10 (2): 174-180.   Abstract （915）      PDF（pc） （469KB）（160）       Knowledge map    Save In this paper, the influence of heat-treatment on charge storage capability and the outstanding charge storage capability at elevated temperature for the PTFE electret were studied by means of constant voltage corona charging at RT and elevated temperature and the TSD experiment. The transport model of detrapping carriers of the PTFE electret which shifted towards the back electrode of the sample was investigated by means of the heat pulse technique, and the LIPP method in combination with the TSD experiment. Related Articles | Metrics | Comments（0） Cited: Baidu(14)

Select

THE TEMPERATURE DEPENDENCE OF THE TWO-DIMENSIONAL FRENKEL EXCITON EFFECTIVE MASS WANG ZONGGANG, GIT SHIWEI Journal of Applied Sciences    1992, 10 (2): 181-183.   Abstract （393）      PDF（pc） （175KB）（109）       Knowledge map    Save The properties of a two-dimensional Frenkel exoiton is discussed by means of a model which takes account of the atomicity of the lattice. The lattice vibration and the interaction between the exciton and the lattice displacement are treated by the second quantization method. The self-trapped energy and the temperature dependence of the effective mass of the two-dimensional Frenkel exoiton are derived. Related Articles | Metrics | Comments（0）

Select

GLOBAL ASYMPTOTIC STABILITY OF LARGE-SCALE NONLINEAR SYSTEMS WITH INFINITE DELAYS DENG FEIQI, ZHAO YUPENG Journal of Applied Sciences    1992, 10 (2): 184-188.   Abstract （294）      PDF（pc） （292KB）（59）       Knowledge map    Save In this paper, we discuss the global asymptotic stability of large-scale nonlinear systems with infinite delays by the Liapunov Function Method and some new skills. We have obtained some simple and direct criteria for the stability of the systems. Related Articles | Metrics | Comments（0） Cited: Baidu(1)

Select

MYOCARDIAL INFARCTION MATHEMATICAL MODELLING AND CLINIC O. M. BELOTSERKOVSKII, A. V. VINOGRADOV, A. S. GLAZTJNOV Journal of Applied Sciences    1992, 10 (3): 189-198.   Abstract （388）      PDF（pc） （617KB）（72）       Knowledge map    Save 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. Related Articles | Metrics | Comments（0）

Select

A STUDY OF DEFECTS FROM ELECTRON IRRADIATION IN N-TYPE LPE AND VPE-GaAs LAYERS HU YUSHENG Journal of Applied Sciences    1992, 10 (3): 199-205.   Abstract （375）      PDF（pc） （461KB）（89）       Knowledge map    Save 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 NT 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-NT-1 graph. Related Articles | Metrics | Comments（0）

Select

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 Journal of Applied Sciences    1992, 10 (3): 206-214.   Abstract （441）      PDF（pc） （530KB）（65）       Knowledge map    Save 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. Related Articles | Metrics | Comments（0）

Select

THE STUDY OF PREPARATION OF SPINDLE-TYPE HEMATITE PARTICLES ZENG HUANXING, REN FUMIN Journal of Applied Sciences    1992, 10 (3): 215-220.   Abstract （343）      PDF（pc） （1434KB）（94）       Knowledge map    Save 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. Related Articles | Metrics | Comments（0） Cited: Baidu(3)

Select

RESEARCHES ON AND APPLICATIONS OF BLANKING DEFORMATION MECHANICS OF METAL SHEET LU XLANFBNG Journal of Applied Sciences    1992, 10 (3): 221-226.   Abstract （298）      PDF（pc） （1120KB）（101）       Knowledge map    Save 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. Related Articles | Metrics | Comments（0） Cited: Baidu(2)

Select

THE STUDIES OF POLARIZATION BEHAVIOR ON SEMICONDUCTOR ELECTRODES TANG MINGWEI, XU MIN, ZHANG HENGHUA Journal of Applied Sciences    1992, 10 (3): 227-232.   Abstract （277）      PDF（pc） （370KB）（66）       Knowledge map    Save The theoretical concepts of polarization behavior of the Fe (ON)64-/Fe(ON)63- 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. Related Articles | Metrics | Comments（0）

Select

THEORY OF ISOTHERMAL CHARGE AND DIRECT DETERMINATION OF TRAP DISTRIBUTIONS IN SOLID DIELECTRICS YANG BAITUN, TU DEMING, LIU YAONAN Journal of Applied Sciences    1992, 10 (3): 233-240.   Abstract （326）      PDF（pc） （472KB）（96）       Knowledge map    Save 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. Related Articles | Metrics | Comments（0） Cited: Baidu(7)

Select

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 Journal of Applied Sciences    1992, 10 (3): 241-246.   Abstract （388）      PDF（pc） （1326KB）（119）       Knowledge map    Save 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. Related Articles | Metrics | Comments（0）

Select

COEFICIENTS ACQUISITION IN DATABASE SYSTEM WU XINDONG, WANG HAO Journal of Applied Sciences    1992, 10 (3): 247-251.   Abstract （373）      PDF（pc） （322KB）（57）       Knowledge map    Save 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. Related Articles | Metrics | Comments（0）

Select

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 Journal of Applied Sciences    1992, 10 (3): 252-258.   Abstract （290）      PDF（pc） （455KB）（68）       Knowledge map    Save 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. Related Articles | Metrics | Comments（0）

Select

STUDY ON THEORY FOR ECCENTRIC CIRCLE AND LEAST SQUARE CIRCLE ZHU XUNSHENG, XUE BINYUAN Journal of Applied Sciences    1992, 10 (3): 259-264.   Abstract （661）      PDF（pc） （338KB）（95）       Knowledge map    Save 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. Related Articles | Metrics | Comments（0）

Select

RESEARCH ON THE REPRESENTATION STRUCTURE OF KNOWLEDGE-BASE AND SOLVING ALGORITHM IN THE REAL-TIME CONTROL EXPERT SYSTEM ZHENG DELING, LIU HONGCAI, XU GUANGXIN Journal of Applied Sciences    1992, 10 (3): 265-272.   Abstract （258）      PDF（pc） （518KB）（71）       Knowledge map    Save 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. Related Articles | Metrics | Comments（0）

Select

STEADY RESPONSE OF AN ANNULAR CRACK IN AN INFINITELY LONG HOLLOW CYLINDER WITH ELASTIC WAVES ZHANG ZIMAO, ZHOU ZHENZU, WANG DUO Journal of Applied Sciences    1992, 10 (3): 273-278.   Abstract （325）      PDF（pc） （354KB）（56）       Knowledge map    Save 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. Related Articles | Metrics | Comments（0）

• page
• Page 1 of 2
• Total 55 records
• First page
• Prev page
• Next page
• Last page