1995 Vol.13

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OBSERVATIONO OF LB FILMS BY ATOMIC FORCE MICROSCOPY (AFM):FROM MICRON DOWN To MOLECULAR SCALES YANG XIAOMIN, GU ZHONGZE, WEI YU Journal of Applied Sciences    1995, 13 (1): 1-6.   Abstract （468）      PDF（pc） （451KB）（105）       Knowledge map    Save The atomic force microscopy (AFM) was used to observe the microscopic structure of stearic acid LB films deposited on solid substrate,the range being from micron down to molecular scales.The AFM images show the surface morphology of the film intermolecular arrays as well as film defects.By increasing the applied force from the AFM tip, we can make a pattern on LB films and directly measure the thickness of the monolayer. Related Articles | Metrics | Comments（0）

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THE ADJUSTING PROCESSING OF THE MEASURING OF FLATNESS AND ITS MICROCOMPUTER REALIZATION HOU BOJIE, XIONG YOULUN, LI XINSHENG, ZHOU HUIXING Journal of Applied Sciences    1995, 13 (1): 7-13.   Abstract （489）      PDF（pc） （375KB）（83）       Knowledge map    Save The method for the adjusting processing of the flatness error measurement is The flow chart of a high-LeveL microprogramming language foreveral indirect measurement methods is given. Related Articles | Metrics | Comments（0）

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MODEL RESEARCH OF THE FUSED TAPERED OPTICAL FIBER COUPLERS GU BIXGSHENG, ZHANG JIALUN, SHEN WENDA, LI QINGNING Journal of Applied Sciences    1995, 13 (1): 14-20.   Abstract （413）      PDF（pc） （423KB）（98）       Knowledge map    Save We Proved theoretically that the week guiding and weak coupling approximatlon must be untilized when our approximate parallel waveguide model takes the place of the original model of the fused tapered wide band coupler.According to the experiment on the weakly fused tapered coupler developed by us,we obtained that the fused tapered wide band coupler with a shape of dumb-bell satisfied the weak guiding and weak coupling conditions.Furthermore,according to the curve of the translation power versus the wavelenth,we obtained that not only the theoretical curve reflecting the wide band characteristic matched well with the experiment curve,but the coupling characteristic was very sensitive to the ratio of two fiber cores and fused length,a fact identical with the practical result. Related Articles | Metrics | Comments（0）

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CHARGE DYNAMICS OF SILICON DIOXIDE ELECTRETS XIA ZHONGFU, LU METAN, P Guenther, SHI LINSHENG Journal of Applied Sciences    1995, 13 (1): 21-28.   Abstract （389）      PDF（pc） （517KB）（104）       Knowledge map    Save In this paper,the transport rule of detrapped charges (either negative surface charges or positive surface and bulk charges) in the bulk of the silicon dioxide film electrets was systematically studied. The discharge behavior of silicon dioxide electret,the influence of chemical surface treatment on charge stability and the shift of charge layer in the bulk for SiO2 were investigated. The mean charge depth can be shifted from the near free surface into the bulk of SiO2 by control-ling the ageing temperature. The negative charges in the bulk of silicon dioxide have excellent stability,which is a very important result for the study being done about the improvement of quality for SiO2 micro-sensors. Related Articles | Metrics | Comments（0）

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MONTE CARLO SIMULATION OF ELECTRON BEAM SCATTERING TRAJECTORIES IN LB RESISTS AND SUBSTRATE AND THE SUPERIORITIES OF LB RESISTS FROM BACK-SCATTERED YIELD LU WU, GU NING, LU ZUHONG, WEI YU Journal of Applied Sciences    1995, 13 (1): 29-34.   Abstract （381）      PDF（pc） （387KB）（89）       Knowledge map    Save The actions between electrons and atoms of resistS or substrate in electron beam exposure are studied in this paper by applying the Monte Carlo method. The scatter trajectories of electrons in PMMA (polymethylmethacrylate) resists Prepared by Langmuir Blodgett (LB) techniques or spining cast on Si substrate or Si substrate covered with Cr film and the back-scattered yield have been calculated in different conditions. A refraction model of high-energy electron in multilayer medium has been put forward to describe the changes of scatter distance and scatter angle of the electron when it comes from one layer into another layer. The results prove that there is a smaller back-scattered yield in LB resists for electrons and the purpose decrease the proximity effect can be reached no matter whether lower or higher energy iS adopted in electron beam LB resist exposure. Related Articles | Metrics | Comments（0）

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AN INVESTIGATION OF PLASMA SPECTRUM IN THE PROCESS OF DIAMOND THIN FILM DEPOSITED BY MPCVD ZHOU MINGHUA, XI YIBEN, ZHANG XUBAI, WANG HONG Journal of Applied Sciences    1995, 13 (1): 35-38.   Abstract （427）      PDF（pc） （255KB）（78）       Knowledge map    Save The character of the average energy of the electrons in the plasma ball generated by microwaves is studied by observing the spectrum of the plasma ball under different depositing conditions.The mechanism of deposition is discussed by analyzing the collisions between electrons and hydrocarbon molecules and the change of the hydrocarbon radicals' energy. Related Articles | Metrics | Comments（0）

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X-RAY DOUBLE-CRYSATL DIFFRACTION SPECTRUM OF RAPID THERMAL ANNEALED Si+ IMPLANTED GaAs GU HONG, XIA GUANQUN, CHEN JINGYI, ZHU NANCHANG, SHENG HONGLIE, ZHOU ZHUYAO Journal of Applied Sciences    1995, 13 (1): 39-45.   Abstract （381）      PDF（pc） （463KB）（79）       Knowledge map    Save GaAs films are implanted with Si ions at 180 keV with doses of 5×1012/cm2~1015/cm2 and then rapid thermal annealing is Performed by incoheret light.The strain and doping mechanisms are studied by double-crystal diffractometry in connection with backscattering and Hall measurement.The compensation ratios are calculated by using the Mobility theory. The results suggest that when implanting at low doses,the amphoteric property of Si plays the main role in the activation effcieney, and that at high implanting doses the low electrical activation is caused by the presence of interstitial Si. Related Articles | Metrics | Comments（0）

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THE OPTIMAL DISCRETIZATION SCHEME FOR TWO-DIMENSIONAL CURRENT CONTINUITY EQUATION TENG ZHIMENG, HE YE, DING XINFANG, WEI TONGLL, TONG QINYI Journal of Applied Sciences    1995, 13 (1): 46-50.   Abstract （544）      PDF（pc） （297KB）（108）       Knowledge map    Save This paper presents a simple and novel finite difference scheme for the two-dimonsional current continuity equation, which can preclude nonphysical oscillations and effciently reduce the crosswind effect.In comparison with the classical multidimensional S-G scheme and the SUPG scheme the present scheme exhibits bettr numerical properties,so it can be applied in computer simulation of semiconductor devices. Related Articles | Metrics | Comments（0）

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A DIRECT COMPARATIVE INTERPRETATION FOR DIFFRACTION OF PARTIALLY COHERENT LIGHT E GUOGUANG Journal of Applied Sciences    1995, 13 (1): 51-62.   Abstract （366）      PDF（pc） （709KB）（76）       Knowledge map    Save Assuming paraxial approximation and quasi-monochromacy,the diffraction of Partially Coherent Light is investigated.It has been verified that the intensity distribution in the diffraction pattern is proportional to the convolution of the intensity distribution,due to a monochromatic point light source and a Fourier transformation of Mutual Coherence Function in the test plane.This result is valid in both diffraction cases:i,e,in the near field, as well as in the far field.Especially,the effect of the Mutual Coherence Function on the spectrum of intensity distribution of ideal diffraction is also discussed after the contrast function is introduced. Related Articles | Metrics | Comments（0）

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SOLIDIFICATION STUDY ON NON-HEAT-TREATMENT HIGH CARBON HIGH MANGANESE STEEL AND ITS APPLICATION PROSPECTS SHI ZHONGLIANG, LI SHAOXIONG, YIN YANSHENG Journal of Applied Sciences    1995, 13 (1): 63-68.   Abstract （341）      PDF（pc） （404KB）（107）       Knowledge map    Save Carbide formation and its morphology of high manganese steel have been further researched in the light of nonequilibrium solidification (liquid-quenching and casting).It has been found that carbide can be formed and its growth abides by the branohing cooperation growth mold.It is put forward that the carbide growth can be improved by modification treatment,the branching growth carbide can be turned into spheroidite,which is proved by the test of Si-Ca modification treatment of high manganese steel.The reason is that the content of active trace elements,surphur and oxygen,and their distribution have changed.The results will provide theoretical and practical bases for as-cast high carbon high manganese steel product development and application. Related Articles | Metrics | Comments（0）

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STUDY OF THE PROCESS OF COPPER-PLATING ON BASE-METAL IRON WANG CEAOMIN, FENG SHAOBIN Journal of Applied Sciences    1995, 13 (1): 69-73.   Abstract （475）      PDF（pc） （299KB）（112）       Knowledge map    Save In this paper,the process of copper metal electrodeposit in the electrolysis bath was studied by the constant current and the encircled volt-ampere methods.it was observed that the iron electrode surface was first activated and then the metal was separated out along with potential negative shifting.Thus the high strength combination between the plating deposit and the iron substrate is achieved. Related Articles | Metrics | Comments（0）

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THE TENSILE STRENGTH AND FRACTURE PROPERTIES OF THE COATED CARBON FIBERS CHU SHUANGJIE Journal of Applied Sciences    1995, 13 (1): 74-80.   Abstract （517）      PDF（pc） （498KB）（109）       Knowledge map    Save In the paper,with the help of the CVD method,the author acquired uniform SiC coating,C+SiC composite coating,Si coating and C-Si gradient coating on the surface of carbon fibers (CF);studied the influence of the coating on the tensile strength of CF; analysed the phase structure of the coating and studied the fracture process and fracture texture.Experimental results show that the tensile strength of the coated CF is lower than that of the acetone treated CF;that the sequence of the tensile strength magnitude of the coated CF is from the C-Si gradient coated CF to the C+SiC composite ccated CF,tO the SiC coated CF,and to the single Si coated CF;and that the phase structures of all coatings on the surface of CF are noncrvstalline,The author further proved "the turbostratic graphite structure" of the PAN Ⅱfiber,The characterizations of appearance of the fracture of PAN fiber are the step form wave form,buckle form, car arm form,etc,respectively.The appearance of the fracture of the C-Si gradient coated CF,the C+ SiC composite coated CF and the SiC coated CF is in the flat cutting form; the fracture mechanism is that the craze spreads throngh the CF. But the appearance of the fracture of the single Si coated CF is in the pull-out form; the fracture mechanism is that the craze spreads along the interface of the coating,the CF is split. Related Articles | Metrics | Comments（0）

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PARALLEL CORE CONSTANTS YAO KAIYI, SHEN JIANGGAN Journal of Applied Sciences    1995, 13 (1): 81-87.   Abstract （358）      PDF（pc） （358KB）（95）       Knowledge map    Save This paper introduces the definition of parallel core constants,and describes the necessity of the introduction of these constants,the source of these constants and their calculations.At the end of the paper,there are some examples for the application of these constants.The results consist extremely well with practice. Related Articles | Metrics | Comments（0）

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ANALYSIS OF HEAT AND MASS TRANSFER AND REFRIGERATING PERFORMANCE IN POROUS WINDOW ZHANG ZHE, LIU WEI, WANG CHONGQI, CHENG SHANGMO Journal of Applied Sciences    1995, 13 (1): 88-94.   Abstract （334）      PDF（pc） （462KB）（122）       Knowledge map    Save In this paper,from the macroscopic continuum approach,a set of general equations are established to describe the heat and mass transfer through unsaturated porous media.The SIMPLE method is adopted to solve the governing equations for the two-dimensional porous window model.The field distributions of variables in the porous bed and the heat flux between the porous window and the environment under different working conditions are obtained by numerical simulation.The results show that the mathematical model and the numerical method are reasonable and feasible,and that the heat taken out of room by the porons window is capable of meeting some air-conditioning needs.The relation between the environment parameters and heat-mass transport in the porous bed and the heat exchange capability of the porous window are also analyzed. Related Articles | Metrics | Comments（0）

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THEORETIECAL PRINCIP LES AND CONTROL TACTICS ON MECHANISMS OF ACTIVE VIBRATION CONTROL USING AN ELECTROMAGNETIC ACTUATOR ZHU MEILING, WANG FENGQUAN, YAN JINGPING, XU SHANGXIAN Journal of Applied Sciences    1995, 13 (1): 95-102.   Abstract （603）      PDF（pc） （472KB）（141）       Knowledge map    Save The mechanisms of active vibration control using an electromagnetic actuator are investigated in this paper.The system test model is built.The vibration transmissibility is derived from the model by means of transfer function analysis.To determine the limited gain values of various feedback variables,the stability analysis of the active control system is carried out The vibration-isolation characteristics of the active vibration control system of the single freedom degree are discussed using an electromagnetic actuator for various variables and various feedback gain valnes with computer simulation.It si shown by analysis results that the combined feedback variable method based on absolute position,absolut evelocity and relative position variables has an effective vibration isolation property even in the condition of the low and wide frequencies. Related Articles | Metrics | Comments（0）

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A PRECISE METHOD OF CALCULATING THE PARAMETER ε-THE MEAN STRAIN RATE IN ROLLING ZHAO DEWEN, TIE WEILIN Journal of Applied Sciences    1995, 13 (1): 103-108.   Abstract （609）      PDF（pc） （335KB）（162）       Knowledge map    Save With an accurate parametric equation of the contact arc,the kinematically admissible velocity and strain rate fields are established in this paper.A precise formula to calculate the average strain rate in rolling is dedued by the parametric integral and the integral mean value theorem.It is compared with the traditional formulas through an actual measured example. Related Articles | Metrics | Comments（0）

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A B-SPLINE METHOD FOR SMOOTHING TURBINE BLADE CONTOURS WEI YUANQIAN Journal of Applied Sciences    1995, 13 (1): 109-115.   Abstract （347）      PDF（pc） （399KB）（79）       Knowledge map    Save This paper chiefly researches on some conrete applications of a B-spline method for smoothing turbine blade contours. Related Articles | Metrics | Comments（0）

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THE EFFECT OF DIRECT COUPLING ON THE FMCW RADAR AND THE METHOD OF ELIMINATING THE EFFECT YU SHUNDE, ZHU WEIZHONG Journal of Applied Sciences    1995, 13 (1): 116-120.   Abstract （342）      PDF（pc） （320KB）（89）       Knowledge map    Save Thie article,using the spectrum analytic method,analyses the effect on the actual sensitivity of the receiving system of the FMCW radar.The effect is produced by the direct coupling of the transceive antenna,the feeder leak and the refiection of environmental objects.The method for the elimination of the effect is offered. Related Articles | Metrics | Comments（0）

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THE PROPERTIES OF COERCIVITY OF FRACTAL AGGREGATES FORMED BY MAGNETIC PARTICLES WANF QIAN, SAUN QIANG, DENG ZHAOJING Journal of Applied Sciences    1995, 13 (1): 121-126.   Abstract （344）      PDF（pc） （338KB）（66）       Knowledge map    Save In this paper, the effect of fractal dismension (D) in coercivity (H0) of single-domain particle aggregates is discused. Making use of dpole field approximation,an expression relatng D and H0 is derived,which states that H0 is a deoreasing function of D. By analyzing the relati n between D and packing density (p),it is found that th.obtained conclusion is consistent with the existing theoretical and experimental results. Related Articles | Metrics | Comments（0）

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COAL PARTICLE SURFACE CHARACTERISTICS AND SURFACE SMOOTH FACTOR THEORY IN COMBUSTION GU FAN, XU JINYUAN, SHEN HONHMEI Journal of Applied Sciences    1995, 13 (2): 127-135.   Abstract （328）      PDF（pc） （535KB）（73）       Knowledge map    Save The present paper experimentally and theoretically investigated the coal particle surfaee in combustion,The measurement system composed of an ESM and an image computer was developed and used.The particle surfaces were measured with the system for various kinds of coal in different burning ways. Based on the experiment,the particle surface smooth factor theory of coal combustion was put forward, The relationship between coal combustion and the particle surface smooth factor was established in the theory,The effects of combustion on the particle surface were discussed. Related Articles | Metrics | Comments（0） Cited: Baidu(3)

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OPTICAL TOMOGRAPHY AND IMAGE PROCESSING SYSTEM FOR MEASURING 3D ASYMMETRIC FLUID FIELD XIAO XUDONG, SHI DUFANG, CHEN SHAOHUA, HAN CAIYUAN Journal of Applied Sciences    1995, 13 (2): 136-142.   Abstract （340）      PDF（pc） （475KB）（59）       Knowledge map    Save In this paper,a simple holographic interferometric system that can obtain multi-directional interference fringe data in optical tomography is designed.The interferograms of the spreading heat air flow are processed and measured by means of the computer image analyzing and processing system. The temperature distribution of a section in the air flow is reconstructed, and compared with the temperatures by a thermal couple at three points. Related Articles | Metrics | Comments（0）

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DETERMIMATION OF THERMAL CONDUCTIVITIES OF ENERGETIC MATERIALS BY MICROCALORIMETRY HU RONGZU, LI NAN, CHU SHIJIN, CHEN XUELIN Journal of Applied Sciences    1995, 13 (2): 143-158.   Abstract （493）      PDF（pc） （1017KB）（83）       Knowledge map    Save A device of measuring the thermal conductivity of the pellets of propellsants and explosives has been constructed. A method and a calculation formula for determining the thermal conductivity of the pellets of propellants and explosives under the constant radial heat flow ceondition by the use of Peltier and Joule effects are presented. Using this device and inicrocalorimeter, type RD-496-Ⅱ,the instrument constant and coefficient of themal disequilibrium have been determined and the thermal conductivities of thirteen materials:quartz glass,plexiglass, teflon, polyethylene, DB propellant DB-2 (nitrocellulose (NC)/nitroglycerine (NG)/dinitrotoluene/dimethyl centralite/vaseline/PbI/CaCO3,59. 6/25/8.8/3/1.2/1.2/1.2), DB propellant SQ (NC/NG/diethyl phthalate (DEP)/binder, 59/29/7/5), DB propellant RHN-149 (NC/NG/triacetin (TA)/binder-Ⅰ,52.25/25/8/15),DB propellant RHN-190/NC/NG/TA/biuder-Ⅱ, 52/26/7/15). 2, 4,6-trinitrotoluene (TNT), composition B, desensitised (TNT/cyclotrimethylene-trinituramine (RDX)/polyquinone/mononitrotoluene (MNT)/wax, 40/60/0. 5/0. 4/0.5), explosive JH-9105 (RDX/binder/desensitiser, 95. 59/3. 92/0. 49), explosive JO-9159 (cyclotetramethylenetetranitramine (HMX)/binder-I/desensitiser, 95/4. 3/0. 7) and explosive JO-9185 (HMX/binder-Ⅱ/desensitiser, 95/4/1) at 298K are measured. Related Articles | Metrics | Comments（0）

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STUDY OF THE PLASMA PRODUCED BY YAG LASER ACTING UPON SILICON PHOTODIODE NI XIAOIWU, LU JIAN, HE ANZHI Journal of Applied Sciences    1995, 13 (2): 159-162.   Abstract （334）      PDF（pc） （283KB）（54）       Knowledge map    Save The plasma produced by the Q-switched YAG laser acting upon a silicon diode having a PIN junction has been investigated theoretically and experimentally.Mach-Zehnder interferograms of the plasma and related computed results have been obtained for the first time. Related Articles | Metrics | Comments（0）

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THE REDUCTION OF TRAVELLING WAVE SCATTERING BY MAGNETIC DIELECTRIC COATING LINZHISEN LIN ZHISEN, NI WEILI Journal of Applied Sciences    1995, 13 (2): 163-168.   Abstract （287）      PDF（pc） （376KB）（72）       Knowledge map    Save In this paper, polarized currents and conductive currents are used in the analysis of the scattering from magnetic dielectric coated objects, The relation between the electromagnetic property of the material and the travelling wave is studied. It shows that a thin layer of lossy magnetic coating is effective for reducing travelling wave scattering. Related Articles | Metrics | Comments（0）

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EXPERIMENT ON MAGNETO-OPTICAL DISK AGAINST ADVERSE CIRCUMSTANCES MIAO XIANGSHUI, LI ZUOYI, HU YONGSHI, LIN GENGQI Journal of Applied Sciences    1995, 13 (2): 169-173.   Abstract （400）      PDF（pc） （326KB）（61）       Knowledge map    Save The RE-TM magneto-optical recording film and protective film were prepared by RF sputtering or reactlve RF sputtering.By measuring from the film side and the substrate side,we studied the experiments of the magneto-optical disk material with protective films against adverse circumstances.The aging test and temperature dependence of these samples show that the TbFeCo films with AlN or AlSiN protective films have the excellent ability against adverse circumstances,and that thev can be used for magneto-optical disks with a wide temperature range. Related Articles | Metrics | Comments（0）

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STUDIES OF THE PULSED VUV RADIATION SOURCES WITH CONTINUOUS SPECTRUM ZHOU XIAOYONG, ZHU SHAOLONG Journal of Applied Sciences    1995, 13 (2): 174-178.   Abstract （761）      PDF（pc） （358KB）（93）       Knowledge map    Save The design and the investigations of a new vacunm ultraviolet (VUV) radiation source with continuous spectrum are presented.For enhancing the continuous spectrum intensity,the VUV source is designed to work under conditions of high pressure (0.2~0.9MPa) and short pulses.It is found from experiments that the breakdown voltage of the VUV source with a filling gas of hydrogen id about 8×103 V and the pulse width 1×10-7 sec,depending on the filling gas pressure and the electrode separation. The breakdown voltage is also theoretically calculated by the Meek breakdown criterion,and the pulse width by the discharge channel expansion theory,It is found that both are in reasonable agreement with the experimental results. Related Articles | Metrics | Comments（0）

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ARTIFICIAL NEURAL NETWORKS AS APPLIED TO QUANTITATIVE SPECTROSCOPIC ANALYSIS LI ZHILIANG, LIU SHUQIONG, SHI LEMING, PAN ZHONGXIAO, LOU MANTENG, LI MENGLONG, YU BANMEI Journal of Applied Sciences    1995, 13 (2): 179-183.   Abstract （348）      PDF（pc） （373KB）（73）       Knowledge map    Save The artificial neural networks (ANN) method is utilized in the analytical calibration and quantitative resolution for spectroscopy. The simulated and practical data are proeessed by using the multilayered perceptrons model and backpropagation (BP) algorithm. The results show that is practicable to adopt artificial neural networks to calibrate and resolve the spectroscopie data and peaks. Related Articles | Metrics | Comments（0） Cited: Baidu(2)

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LOCAL FIELD IN A SINGLE -MODE HELICAL FIBER CHEN GUANSAN Journal of Applied Sciences    1995, 13 (2): 184-188.   Abstract （345）      PDF（pc） （320KB）（69）       Knowledge map    Save Based on the wave equation,we directly analyse a single-mode helical fiber with a circular cross section and step profile of the refractive index in the local coordinate system. Withe the perturbation method,the analytical expressions of the fundamental mode field and the propagation constant are given,Two results are brought about:(1) the fundamental modes in a single-mode helical fiber are right-rotated and left-rotated circularly polarised modes. (2) the difference of propagation constants between the two modes iS 2τ.The theoretical results agree with those of the known experimental measurements. Related Articles | Metrics | Comments（0）

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DISTRIBUTION OF TOTAL EL2 CONCENTRATION AND ITS FERMI OCCUPANCY FUNCTION IN UNDOPED LECSI GaAs YANG RUIXIA, LI GUANGPING, WANG QIN Journal of Applied Sciences    1995, 13 (2): 189-194.   Abstract （442）      PDF（pc） （379KB）（76）       Knowledge map    Save The distributions of ionized and neutral EL2 concentrations are measured by the multiple wavelength infrared absorption method in the undoped LECSI GaAs.The distributions of the total EL2 concentration and its Fermi occupancy function are also obtained from the measurement of the distrbutions of the ionized and neutral EL2 concentrations.The results indicate that all of the distributions of the ionized EL2 concentration,neutral EL2 concentration,total EL2 concentra-tion, and EL2 Fermi occupallcy function are inhomogeneous;that both total and neutral EL2 concentrations radial distributions are W-shaped;and that the W-shaped radial distribution of the neutral EL2 concentration is not due to the fluctuation of the Fermi occupancy function. Related Articles | Metrics | Comments（0）

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STUDY ON THE PROCESSING NETHOD OF PERIODIC AND TENDENTIOUS SIGNAL IN TIME SERIES MODEL -BUILDING RUI XIAOJIAN, ZHONG BINGLIN, YAN JIGNPING, ZHANG YOUZHEN Journal of Applied Sciences    1995, 13 (2): 195-201.   Abstract （466）      PDF（pc） （440KB）（70）       Knowledge map    Save By using the Green Function formula of the autoregressive-move-average model (A RMA model),the describing problem of the periodic and tendentious signal iS discussed. Based on theory deduction and modelling practice,it is obtained that the above signals can be correctly expressed by an ARMA model or AR model.So in the model-building process of time series, it is unnecessary and improper to eliminate these signals.This viewpoint differs from the traditional one of this problem. The reason why the wrong view was developed is also discussed in this paper. Related Articles | Metrics | Comments（0）

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MATHEMATICAL MODEL ON THE DESIGN OF FUNCTIONALLY GRADICNT MATERIALS AND THERMAL STRESSES ANALYSIS OF FGM PLATES ZHANG XIAODAN, QI GUO'AN, WANG ZHAOXIA, GE CHANGCHUN Journal of Applied Sciences    1995, 13 (2): 202-208.   Abstract （481）      PDF（pc） （367KB）（95）       Knowledge map    Save In this paper, the analytical procedure for functionally gradient material (FGM) plates is developed based on the classical theory of laminated plates and the computational mathematical method.Temperature solutions are obtained for the steady state. Utilizing the material properties of each hypothetical layer,the effective properties are estimated and thermal stress distributions are caloulated. Related Articles | Metrics | Comments（0）

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FINITE-TIME THERMODYNAMIC OPTIMIZATION OF FINITE HEAT RESERVOIR STEADY-STATE HEAT ENGINE UNDER TWO KINDS OF RESTRAINING CONDITIONS YAO SHOUGUANG Journal of Applied Sciences    1995, 13 (2): 209-214.   Abstract （424）      PDF（pc） （386KB）（71）       Knowledge map    Save In this paper,the power and efficiency of the finite time steady-state heat engine operating between two reservoirs with finite heat-capacity rate are studied.The optimum power and efficiency of the finite time endoreversible Carnot heat engine under two kinds of restraining conditions and operating in two cyclic modes are derived analytically, and some new performance limits of the finite time thermodynamics are discussed. Related Articles | Metrics | Comments（0）

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NUMERICAL ANALYSIS AND APPLICATION OF SUPERPOSED DIELECTRIC RESONATIORS WANG JIANHAI, DAI JUN, FANG WEIDE Journal of Applied Sciences    1995, 13 (2): 215-220.   Abstract （352）      PDF（pc） （343KB）（62）       Knowledge map    Save This paper analysed numerically the superposed dielectric resonators by FDM. The numerical results are in very good agreement with the available published results and measured results. With this strueture,it is possible to determine the local complex permittivity of M. I, C substrates. Related Articles | Metrics | Comments（0）

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ON ALGORITHM OF COMBINING MULTIPLE NEEDLE MAPS FOP RECOVERING 3-D SURFACE DEPTH YANG JINGAN Journal of Applied Sciences    1995, 13 (2): 221-228.   Abstract （395）      PDF（pc） （514KB）（66）       Knowledge map    Save This paper proposes an algorithm of combining multiple needle maps for recovering 3-D surface depth. The algorithm can produce first a pair of the needle maps by the dual photometric stereo system and solve disparities between the corresponding areas in the two needle maps,then it combines the disparities correctly and matches them accurately, and finally it reconstructs the 3-D depth of the object surface. This method is very useful for us to conduct research on 3-D surface depth reconstruction and to recover scene structures. Related Articles | Metrics | Comments（0）

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A STUDY ON LONG CHAIN SINGLE-AXIS ORIENTATION OF PI MOLECULES IN PI LB FILMS BY AFM GU NING, YANG XIAOMIN, LU WU, LU ZHONG, WEI YU Journal of Applied Sciences    1995, 13 (2): 229-234.   Abstract （455）      PDF（pc） （426KB）（60）       Knowledge map    Save The microscopic molecular structure of a polyimide (PI) Langmuir-Blodgett (LB) film monolayer was studied by atomic force microscopy (AFM).An AFM image of a PI monolayer on highly oriented pyrolytic graphite (HOPG) showing clearly the polymer chains was observed. The measured parameters in situ,for example,the distance between oxygen atoms at successive bends is 1.4nm~1.9 nm and the bend angle is about 118 deg.,correspond with those from STM results by the others.The procedure in which the PA3S (polyamie acid alkyl amine salt) film was converted to polyimide film by either the heating method or the solution method is very important.The preliminary results of comparing these two technological processes observed by AFM indicated that the solution method is more suitable for this PI LB film preparation in the usage of the future liquid-crystal display devices. Related Articles | Metrics | Comments（0）

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THREE BASIC CONSERVATION LAWS OF EVOLUTION EQUATIONS YANG LING'E Journal of Applied Sciences    1995, 13 (2): 235-241.   Abstract （398）      PDF（pc） （348KB）（74）       Knowledge map    Save This paper gave the existence of at least three conservation laws for a class of evolution equations.The conservative densities and conservative flows of these conservation laws were also given. Related Articles | Metrics | Comments（0）

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THE STUDY OF LIGHT -INDUCED SYNCHRONOUS FLUORESCENCE SPECTRA OF HUMAN NORMAL TISSUE AND BENIGN TRMORS AND MALIGNANT TUMORS LIU JIAN, FU WEI, LI ANZHI, ZHANG GUANGYIN, LI ZHAO Journal of Applied Sciences    1995, 13 (2): 242-247.   Abstract （343）      PDF（pc） （400KB）（48）       Knowledge map    Save The synchronous fluorescence spectra of △λ=60 nm of normal tissues, benign tumors and malignant tumors of the human cervix, uterus and oarium tissues have been measured with an FlllAI fluoreseence spectrometer. The results revealed that the synchronous fluroescence spectra peak numbers, peak positions and peakintensity are very different;the peak intensity ratio I1/I4 (normal tissue) < I1/I4 (benign turmors) < I1/I4 (malignant tumors).It is expetcted that the synchronous fluroescence spectra will be a new,quick,exact and more valid means for the early detection of cancer. Related Articles | Metrics | Comments（0）

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π--12C INELASTIC SCATTERING AND NEGATIVE π-MESON THERAPY CHEN KEZHONG, GUO BINGYING Journal of Applied Sciences    1995, 13 (2): 248-252.   Abstract （343）      PDF（pc） （320KB）（66）       Knowledge map    Save The physical mechanism of therapy by negative π-meson shower is studied.The DWIA method is adopted to calculate π--12 inelastic scattering.Some characteristics and conclusions of the π-meson radiotherapy for cancer. are suggested. Related Articles | Metrics | Comments（0）

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FOURIER-CHEBYSHEV PSEUDOSPECTRAL APPROXIMATION WITH MIXED FILTERING FOR TWO-DIMENSIONAL VISCOUS INCOMPRESSIBLE FLOW GUO BENYU, LI JIAN Journal of Applied Sciences    1995, 13 (3): 253-271.   Abstract （339）      PDF（pc） （1069KB）（67）       Knowledge map    Save A Fourier-Chebyshev pseudospeotral scheme with mixed generalized Boohner fltering technique is proposed for e two-dimensional unsteady vorticity equation.The generalized stability and convergence are proved strictly.The numerical results are presented.The theoretical analysis in this paper provides a framework for error estimations of such mixed approximation. Related Articles | Metrics | Comments（0）

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CHAOS IN PERIODICALLY MISMATCHED NONLINEAR COUPLERS YIJIANG CHEN Journal of Applied Sciences    1995, 13 (3): 272-282.   Abstract （306）      PDF（pc） （781KB）（124）       Knowledge map    Save The existence of chaos in periodically mismatched twin core nonlinear couplers is demonstrated,using the Poincare map as a measure.A physical inteapretation for the mechanism of the onset of the chaos is also presented, based on coupling of the periodio modes of a periodic structure. Related Articles | Metrics | Comments（0）

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