1994 Vol.12

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THE FOURIER PSEUDOSPECIRAL METHOD FOR FLUID FLOW WITH LOW MACH NUMBER ABDUR RASHID, CAO WEIMING, GUO BENYU Journal of Applied Sciences    1994, 12 (1): 1-12.   Abstract （413）      PDF（pc） （756KB）（74）       Knowledge map    Save A Fourier pseudospectral scheme with a restraint operator is developed for solving fluid flow with low Mach number.The generalized stability and convergence are proved.Numerical results are presented also. Related Articles | Metrics | Comments（0）

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A NEW METHOD TO CALCULATE THE VIBRATIONAL DENSITY OF THE AMORPHOUS STATE Inverse Matrix Equation of Motion Method GAO ERZHEN, GU SHIWEI Journal of Applied Sciences    1994, 12 (1): 13-17.   Abstract （317）      PDF（pc） （268KB）（61）       Knowledge map    Save On the basis of the equation of the motion method,a new method to calculate the vibrational density of the amorphous state:the inverse matrix equation of motion method is developed.This method is more precise and faster than the old one. Related Articles | Metrics | Comments（0）

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ANALYSIS OF THE ELECTROMAGNETIC SCATTERING CHARACTERISTICS FROM AN FSS WITH MULTILAYERED DIELECTRIC SUBSTRATE BY THE METHOD OF LINES HONG WEI Journal of Applied Sciences    1994, 12 (1): 18-24.   Abstract （324）      PDF（pc） （441KB）（72）       Knowledge map    Save Based upon Floquet's theorem,the method of lines is first applied to the analysis of electromagnetic scattering characteristics from a frequency selective surface (FSS) with multilayered dielectric substrates. The formulation is suitable to the FSS with arbitrarily-Shaped elements. Numerical results are in agreement with the experimental data,which verifies the validity of this technique. Related Articles | Metrics | Comments（0）

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THE EIGEN PERMEABILITY AND EIGEN WAVE IN UNRECIPROCAL MEDIUM LIANG CHANGHONG, CUI TIEJUN, LI RUNQI Journal of Applied Sciences    1994, 12 (1): 25-31.   Abstract （393）      PDF（pc） （370KB）（108）       Knowledge map    Save The eigen permeabilities and eigen waves of the basic transmission modes are deduced,which play intrinsical roles in the propagation of plane waves in an unreciprocal medium. The eigen permeability correspond to the propagation coefficient of eigen waves,and all transmission modes can be considered as the linear combinations of these eigen waves.It is also demonstrated that the eigen wave is of ellipfical polarizati in general. Related Articles | Metrics | Comments（0）

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COMPUTATION OF EM SCATTERING FROM 2-D ASYMMETRICALLY ANISOTROPIC CYLINDRICAL MEDIUM BY USING BOUNDARY ELEMENT METHOD ZHANG MING, ZHANG WENXUN Journal of Applied Sciences    1994, 12 (1): 32-40.   Abstract （412）      PDF（pc） （530KB）（88）       Knowledge map    Save In this paper,the electrical field boundary integral equations for the arbitrary shaped two-dimensional homogeneous asymmetrically anisotropic cylindrical medium are derived based on Green's theorem. On applying the pulse-function expansion and,the point-matching technique,the integral equations can be converted into liner algobraical equations.The monostatic and bistatc radar cross sections of asymmetrically anisotropic circular,square and trianglar cylinders are calculated. Related Articles | Metrics | Comments（0）

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THE CRITERIA OF FINITE TIME THERMODYNAMICS ON THE PARAMETER SELECTION OF A HEAT ENGINE OPERATING BETWEEN TWO FINITE HEAT SOURCES YAN ZIJUN, CHEN JINCWN Journal of Applied Sciences    1994, 12 (1): 41-45.   Abstract （310）      PDF（pc） （306KB）（76）       Knowledge map    Save The fundamental optimum formula,the relation between the maximum power output and efficiency,of a heat engine operating between two finite heat sourecs and the criteria of finite time thermodynamics on the parameter selection of the engine are derived.Moreoyer, some wrong conclusions in the related literature are pointed out. Related Articles | Metrics | Comments（0）

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MOMENT EXCITER AND ITS APPLICATION TO EXPERIMENTS OF STRUCTURE-BORNE SOUND QIU SHUYE, B. M. GIBBS Journal of Applied Sciences    1994, 12 (1): 46-52.   Abstract （328）      PDF（pc） （410KB）（83）       Knowledge map    Save In this paper the performances of the moment exciter which is composed of two magnetostrictive rods (Tb0.3Dy0.7Fe1.95) have been discussed.Both simple theory and experiments indicate that the performances of the moment exciter do not basically influence the measurement results of the moment mobilities, but do affect the efficiency for exciting the rotation. The efficiency for exciting the rotation has also been calculated in this paper. Related Articles | Metrics | Comments（0）

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MERCURY SENSOR WITH BI-WAFER OF PIEZOELECTRIC CRUSTAL LI GUANGYUN, LU XINGEN, WANG KEFENG, DU GENDI Journal of Applied Sciences    1994, 12 (1): 53-56.   Abstract （328）      PDF（pc） （279KB）（65）       Knowledge map    Save A new type of piezoelectric crystal sensor detector is designed. The reference wafer and the sensitive wafer are in touch with the detected gases directly at the same time. The mercury vapor response and the interference influence of moisture are tested using the piezoelectric crystal mercury sensor with a double wafer.Results show that in a wide range mercury vapor detection is not influenced by the sensor,when the reference wafer touches the detected gases. Moreover the interference of moisture or any other gas can be greatly decreased. Related Articles | Metrics | Comments（0）

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ON THE STABILITY OF TIME-VARYING INTERVAL MATRIX SUN JITAO Journal of Applied Sciences    1994, 12 (1): 57-60.   Abstract （310）      PDF（pc） （230KB）（83）       Knowledge map    Save In this paper,we suggest the stability concept for the time-varying interval matrix and have obtained sufficient conditions of stability of the time-varying interval matrix. As an example,the results in paper[1] are extended and improved. Related Articles | Metrics | Comments（0）

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SEPARATION AND PROPERTY OF ISOMERS OF α-PINENE-MALEIC ANHYDE ADDUCT GAO NAN, PAN PENGCHEN, YU WEN Journal of Applied Sciences    1994, 12 (1): 61-66.   Abstract （356）      PDF（pc） （368KB）（79）       Knowledge map    Save The separation of isomers of α-pinene-maleic anhydride adduct was studied.The high pure samples of α-terpinene-maleic anhydride (3) and dipentene-maleic anhydride (6) were obtained.The solvability,the activity of cyclic anhydride and the thermostability of (3) were investigated by comparing with those of (6). Related Articles | Metrics | Comments（0）

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NEW Q-ENHANCED SALLEN-KEY'S SC LOWPASS FILTER WU JIE Journal of Applied Sciences    1994, 12 (1): 67-72.   Abstract （411）      PDF（pc） （378KB）（55）       Knowledge map    Save A new Q-enhanced SC second order lowpass filter is presented.The circuit is derived from the Sallen-Key's active RC circuit with a unity-gain amplifier. The optimal design of the minimun capacitor spread for the circuits proposed.Pole ω0 and pole Q sensitivities as well as gain-bandwidth product effects of the SC circuit are also investigated.Computation shows that the capacitor spread for the proposed circuit can be significantly reduced.The validity for the circuit is verified by the experiment with discrete elements. Related Articles | Metrics | Comments（0）

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MICROSTRIP HIGH VOLTAGE SHAPED PULSE GENERATOR WU KEQIN, CHEN SHILING, BAO JIASHAN, ZHI TINGTING, CHEN LANRONG, GU GUANGQING Journal of Applied Sciences    1994, 12 (1): 73-77.   Abstract （366）      PDF（pc） （304KB）（86）       Knowledge map    Save In this paper,the design of the microstrip high voltage shaped pulse generator is described and an integrated system with the high voltage shaped laser pulse generator and the Pockels cell is developed. Related Articles | Metrics | Comments（0）

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FAST SEPARATION ALGORITHM OF BI-LEVEL IMAGES SUPERIMPOSED ON HALFTONE IMAGES YANG JINGAN Journal of Applied Sciences    1994, 12 (1): 78-82.   Abstract （411）      PDF（pc） （239KB）（85）       Knowledge map    Save This paper proposes a fast separation algorithm of bi-level images superimposed on halftone images.The technique used in the algorithm can separate bi-level images superimposed on halftone images correctly.Therefore it can be used to process and analyse facsimile effectively. Related Articles | Metrics | Comments（0）

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THE POSSIBILITY OF IMPROVEMENT IN PERORMANCE OF DIFFUSED JUNCTION SILICON SOLAR CELLS BY MAKING DEEPER DIFFUSION AND ETCHING THE SURFACE ZHANG XIUMIAO Journal of Applied Sciences    1994, 12 (1): 83-87.   Abstract （290）      PDF（pc） （318KB）（69）       Knowledge map    Save Assuming the diffused impurity profile to be Gaussian,a resolution of the minority carrier continuity equation for the diffused region thinned by etching the surface has been given. On the basis of that, computations and analyses have been made for some practical examples. It has been shown that in order to increase the short circuit current contributed by the n+ diffused region, besides the lower surface recombination velocity and lower built-in field gradient,the higher built in field itseif is also important.In the present work it has also been shown that making deeper diffusion and etching the surface are effective to increase short circuit current contributed by the n+ diffused region only if the deeper diffusion is made together with the higher surface impurity concentration. Related Articles | Metrics | Comments（0）

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STUDY OF OPTIMAL PROCESSING FORXH-REP-2 POSITIVE ELECTRON-BEA MRESISTS WANG GUOQUAN, LOU TENGJIAO, WANG QINMEI, WU YULI Journal of Applied Sciences    1994, 12 (1): 88-91.   Abstract （351）      PDF（pc） （281KB）（101）       Knowledge map    Save This paper describes briefly the principle and characteristics of electron-beam lithography.The mechanism of the interaction of energetic electrons with resist materials is also described.The whole processing of XH-REP-2 positive electronbcam resists discussed in detail. We have found a group of optimal parameters of XH-REP-2 positive electron-beam resists and come to the conclusion that XH-REP-2 positive electron-beam resists have high resolution and sensitivity. Related Articles | Metrics | Comments（0）

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STUDY ON THE APPLICATIONS OF RING-SULFONATED POLYANILINE ZHANG GUIPING, GONG KECHENG Journal of Applied Sciences    1994, 12 (1): 92-94.   Abstract （393）      PDF（pc） （182KB）（82）       Knowledge map    Save The potential applications of ring-sulfonated polyaniline (SPANI) have been studied.A kind of easily-made SPANI/PVA composite film has developed and its potential applications are pointed out.The results show that SPANI has the advantages over PANI in elecotrochemical activity and in the application of the battery with zine used as the negative electrode. Related Articles | Metrics | Comments（0）

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EXPERIMENTAL STUDIES ON THE THERMAL EXPANSION BEHAVIOUR OF SINGLE CRYSTAL TELLURIUM DIOXIDE LU CHANGWEI XI TONGGENG LU CHANGWEI, XI TONGGENG, CHEN YUNXIAN, YANG XUEHUA, XU YIBIN, PU ZHIFEN Journal of Applied Sciences    1994, 12 (2): 95-100.   Abstract （406）      PDF（pc） （408KB）（85）       Knowledge map    Save In this paper,the thermal expansion behaviour of the TeO2 single crystal is studied experimentally by the push-rod dilatometery Tg-DTA and X-Ray diffraction methods.It is the first time to measure the thermal expension coefficient of the TeO2 single crystal along a and c axes in the temperature region of 370~500℃ by the push-rod dilatometer method.Furthermore,the anisotropy of the thermal expansion of the TeO2 single crystal is studied according to the structure and the characteristic of cleavage as well as the comparison of the chemical bonding strength of a and c axes. Related Articles | Metrics | Comments（0）

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THE INFLUENCE OF CHEMICAL SURFACE MODIFICATION ON CHARGE STORAGE STABILITY IN THE THERMALLY CROWN SiO2 FILM ELECTRET LIN HUAMAO, XIA ZHONGFU, DING HAI, SHEN SHAOQUN Journal of Applied Sciences    1994, 12 (2): 101-108.   Abstract （443）      PDF（pc） （547KB）（90）       Knowledge map    Save In this paper,the influence of chemical surfaee modification on charge Storage stability in the thermally grown SiO2 film electret is studied.A hydrophobic protective layer is formed on the surface of the SiO2 film electret by an appropri-ate chemical surface modification (using HMDS or DCDMS).Generally,this hydrophobic layer prevents water absorption on the surface of SiO2 and makes the SiO2 electret an excellent electret.During the permanent charge captue and storage in the SiO2 film electret,an electrochemical reaetion takes place and water is produced.The hydrophobic layer formed after chemical surface modification sometimes obstructs the excess water from diffusing out of the electret.In this condition,an unusual phenomenon occurs:the charges stored in the SiO2 electret modified by HMDS or DCDMS decay faster than surface. Related Articles | Metrics | Comments（0）

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ANALYSIS OF INTERNAL DECAY OF CHARGES IN PP ELECTRETS OUYANG OUYANG YI, XIE XISHUN Journal of Applied Sciences    1994, 12 (2): 109-112.   Abstract （817）      PDF（pc） （260KB）（165）       Knowledge map    Save In this paper,the charge-decay of polyproplene (PP) film electrets is analysed.It is shown that the hopping of intrinsic carriers impelled by internal field is the main reason for potential-decay.The average hopping stop-distance calculated from the test data is about the order of 10-8 m. This result has been demonstrated by the X-ray diffraction of the film recently. Related Articles | Metrics | Comments（0）

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CALCULATION OF TRANSIENT RESPONSE OF A TWO-DIMENSIONAL CONDUCTING CAVITY USING MARCHING-ON-IN-FREQUENCY METHOD PENG ZHONGQIU Journal of Applied Sciences    1994, 12 (2): 113-119.   Abstract （413）      PDF（pc） （449KB）（74）       Knowledge map    Save The integral equation is handled using the method of momentes in the complex-frequency domain,the space discretization is fixed for all frequencies and the resulting matrix equation is solved by the conjugate gradient method. The condition of the system matrix is improved in the complex-frequency domain. Good initial estimates are obtained using an extrapolation scheme based on error minimization,thereby the conjugate gradient method converges very fast. The transient response is obtained by carrying out the inverse Laplace transfo rmation by an FFT algorithm. The results of a rectangular cylindrical cavity verify the effectiveness of the new method. Related Articles | Metrics | Comments（0）

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STUDY OF LEUKOCYTE FEATURES IN PERIPHERAL BLOOD FOR AUTOMATIC CLASSIFICATION YANG XIAOMIN YANG XIAOMIN, LUO LIMIN, WEI YU Journal of Applied Sciences    1994, 12 (2): 120-126.   Abstract （440）      PDF（pc） （488KB）（128）       Knowledge map    Save For each cell,a total of 35 features in three kinds are extraeted from the automatic classification system of peripheral blood leukocytes.They are:7 morpho-logic features,12 optical densiey features and 16 texture features.The testing for 1200 leukocytes indicates that using these three kinds of features is better thanjust using the first 2 kinds,and the accuracy rate is approximately 90%. The result is discussed. Related Articles | Metrics | Comments（0）

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AN APPLICATION OF BIPATITE CONNECTIONIST MODEL IN VLSI HIERARCHICAL GLOBAL ROUTING SHEN TAO, GAN JUNERN, YAO LINSHENG Journal of Applied Sciences    1994, 12 (2): 127-132.   Abstract （400）      PDF（pc） （318KB）（79）       Knowledge map    Save The application of the Bipatite Connectionist Model in global routing on 2×2 cells was studied in this paper. The structure of the network was given along with its simulation algorithm. Related Articles | Metrics | Comments（0）

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CIRCUIT STATISTICAL OPTIMIZATION TECHNIQUE UNDER SEQUENTIAL CONVEXITY OF FUNCTIONS HAO YUE Journal of Applied Sciences    1994, 12 (2): 133-139.   Abstract （818）      PDF（pc） （488KB）（77）       Knowledge map    Save Based on the unitized model of design centering for maximum manufacturing yield,optimal toleraneing design, optimal tuning design and design of minimized manufacturing costs of integration,an efficient method of solving DCTT is given under the conditions of sequential convexity of functions in this paper. The method combines the deterministic optimization technique with the orthogonal optimal experiment method to change the 2n vertices of the tolerance region into (n+1) constraint conditions,and uses nondifferentiable optimization to solve the DCTT problem directly. Therefore,the method can solve large scale IC statistical optimization problems. Related Articles | Metrics | Comments（0）

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MOS PHOTO-ELECTRONIC SWITCH IC CHEN DONGFANG, ZHAO GUOZHU, CAI RENKANG, GU MING, WANG LIANG Journal of Applied Sciences    1994, 12 (2): 140-144.   Abstract （410）      PDF（pc） （337KB）（73）       Knowledge map    Save The principle of photo detection by accumulation and the design of MOS photo-electronic switch IC are introdueed.The advantages of the IC are:low cost,low power consumption and multiple functions. Some applications of the IC transducer are presented. Related Articles | Metrics | Comments（0）

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A PIEZOELECTRIC STEP MOTOR WITH SUBMICROMETER STEP SIZE WANG ZHAOQIU, ZHANG JIE, ZHANG SHUYI Journal of Applied Sciences    1994, 12 (2): 145-149.   Abstract （382）      PDF（pc） （285KB）（84）       Knowledge map    Save The operation condition and scanning velocity of a piezoelectric step motor have been studied. It is found that the up and down slopes of the pulsed voltage applied to the piezoelectric step motor not only limit the maximum velocity of the stepper, but also determine the operation condition. In our system,the mechanical and electronie components of the stepper are compact and simple,and the electromagnetic noise has been reduced by taking a shield shape. Related Articles | Metrics | Comments（0）

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FADING RECURSIVE FILTERING AIDED SPECTROSCOPY An Optimal Adaptive Algorithm LI ZHILIANG, YU BANMEI, QIAN FENG, SHI LEMING, PAN ZHONGXIAO, NIE SHENGZHE Journal of Applied Sciences    1994, 12 (2): 150-158.   Abstract （319）      PDF（pc） （547KB）（69）       Knowledge map    Save The fading Kalman recursive optimal filtering is studied for spectroscopic resolution,Based on the nature of Kalman filter that the residual sequenees are not correlated when the optimal gain is obtained, a new fading filtering-optimal adaptive algorithm is proposed and utilized. Through the on-line and adaptive adjustment of the fading or forgetting factor,the convergency and optimality of Kalman filtering are improved using measured outputs or estimated results, even when there exist model errors and/or when the system is affected by unmeasurable external disturbances.The algorithm developed is applied to overlapped peak resolution with good results. Related Articles | Metrics | Comments（0）

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STUDY AND DESIGN OF FLEXURE HINGE PRECISE POSITIONING SYSTEM HAVING RELATIVE WIDE RANGE ZHU FENG, ZHANG HONGHAI, CHEN RIYAO, HUANG QIKUI Journal of Applied Sciences    1994, 12 (2): 159-164.   Abstract （389）      PDF（pc） （375KB）（75）       Knowledge map    Save In this paper,the design of the flexure hinge positioning system having a relative wide range is studied.The paper gives the calculation and formulas for designing the flexure hinge. The flexure hinge mechanism amplified by a two step lever is achieved. It is shown by experimental results that the resolution of the precise positioning system is higher than 0.5μm and that the adjusting range is 180μm,In addition,the paper also discusses the driving property of a piezo-electric actuator used in the flexure hinge machanism. Related Articles | Metrics | Comments（0）

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THE PRINCIPLE OF HARDWARE OPERATED AT THE SAME FREQUENCY IN DIFFERENT PERIODS FOR REAL一TIME FUZZY REASONING PANG FUSHENG Journal of Applied Sciences    1994, 12 (2): 165-170.   Abstract （427）      PDF（pc） （359KB）（74）       Knowledge map    Save The principle of the hardware for real-time fuzzy reasoning is introduced in this paper. The reasoning unit,though it consists of a few fuzzy logical devices,can draw a simple inference at high speed.The membership functions of the engine are regarded as the waves scanned with the same frequency.Three operations needed by the inference are aceomplished in two periods. Related Articles | Metrics | Comments（0）

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METHODS OF IMPROVING THE EVENNESS OF MAGNETIC FIELD XU SHUJUN, XU YOUPENG, JIN BIANJUN, ZHANG YIBING, SHI TAIHUA, LU YUQING Journal of Applied Sciences    1994, 12 (2): 171-178.   Abstract （622）      PDF（pc） （521KB）（101）       Knowledge map    Save A NMR-CT magnet model with scale 1/6 is now being assembled at our laboratory.3.5kG central field is generated by permanent magnet and evenness of field within the cylinder of 0.02083m radius is 1426×10-6. In order to improve the field evenness,we changed the shape of magnetic pole,increased the iron content at the edge of pole face. Consequently,the evenness of field in the same range increases by a factor of 16.5,i.e. 86.4×10-6 is obtained.Comparing with other methods,it is very simple and showes a significant improvement in the evenness. Related Articles | Metrics | Comments（0）

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FINITE ELEMENT METHOD FOR MISCIBLE DISPLACEMENT OF MULTIPHASE FULLY COMPRESSIBLE FLOW YANG DANPING Journal of Applied Sciences    1994, 12 (2): 179-188.   Abstract （401）      PDF（pc） （582KB）（68）       Knowledge map    Save A standard finite element method for miscible displacement of multiphase fully compressible flow with dispersion is given and optimal error estimate in H1-norm is derivedIn order to enhance the approximate accuracy,a modified finite element method,whose working quantity is almost the same as that of the stsndard method but whose convergent rate in L2-norm is optimal,is proposed. Related Articles | Metrics | Comments（0）

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NONPROPAGATING SOLITONS IN NONLINEAR LATTICE SYSTEMS LIANG CHANGHONG, GUAN BORAN Journal of Applied Sciences    1994, 12 (3): 189-195.   Abstract （267）      PDF（pc） （368KB）（77）       Knowledge map    Save The phenomenon that the nonpropagating soliton is a form of soliton existing in the nonlinear lattice system is discussed in this paper. The concept of collision of solitons is used to explain the phenomenon. The pure nonpropagating lattice soliton condition is presented,and the examples of numerical simulation are glven. Related Articles | Metrics | Comments（0）

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STUDIES ONN PASSIVATING A P2S5/NH4OH-TREATED GaAs SURFACE ZONG XIANGFU, WENG YUMIN, LID KEIFENG, FAN ZHINENG, LI CHAN, PAN ZONGWEI Journal of Applied Sciences    1994, 12 (3): 196-202.   Abstract （453）      PDF（pc） （407KB）（76）       Knowledge map    Save The effect of P2S5/NH4OH treatment on the (100) surface of GaAs was studied by X-ray photoelectron spectroscopy (XPS),Auger electron spectroscopy (AES) and photoluminescence (PL).The results show that after passivation the native oxide of GaAs Surface is completely removed and a passivation layer mainly composed of As-Sand Ga-Sbonds forms on the sample surface,and prevents the adsorption of oxygen. This concluson has been supported by results of PL experiments.The PL intensity and its contrast obtained on GaAs surface depend on the surface recombination and they are controlled by passivation. The results of PL experiments show the reduction of surface recombination and of the density of surface states P2S5/NH4OH treatment is more stable than the others,such as Na2S. Related Articles | Metrics | Comments（0）

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INFLUENCE OF THE MICROSTRUCTURE OF Nb2O5-DOPEDNiZnNc FERRITES ON THE ELECTRICAL AND MAGNETIC ROPERTIES OF THE FERRITES CHEN YAJIE, GAO WEIJIAN, JIN ZONGHING Journal of Applied Sciences    1994, 12 (3): 203-208.   Abstract （347）      PDF（pc） （388KB）（67）       Knowledge map    Save This paper investigates the effects of dopant on sintering and the properties of NiZnCu ferrite. There are marked changes in the microstructures of Ni0.3Zn0.7Cu0.04Fe2.04O4+δ doped with various Nb2O5 contents.It is possible that the change in the microstructure is the main reason for the variations of other properties.The-experiments reveal that Nb2O5 can improve the sintering process and protect the-grain from enormous growth, Nb5+ ion can influence the lattice parameter,resistivity, density, initial permeability and magnetic loss. Related Articles | Metrics | Comments（0）

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SYNTHESIS OF AL AND AL-Y FILMS BY IBED TO IMPROVE THE OXIDATION-RESISTANCE OF 304 STAINLESS STEEL LI HUALONG, HUANG YUANWEI, ZHANG YUNSRU, LIU XIANGHUAI Journal of Applied Sciences    1994, 12 (3): 209-217.   Abstract （406）      PDF（pc） （515KB）（96）       Knowledge map    Save Al and Al-Y films were synthesized on the surface of 304 stainless steel by ion-beam-enhanced deposition (IBED).The isothermal oxidation behavior of the Al and Al-Y deposited 304 stainless steel was studied in air at 950℃and 1050℃,and their cylcling oxidation behavior was studied in air at 950℃.The experi-mental results indicated that the synthesized films enhanced remarkably the oxidation-resistance of the 304 stainless steel,and that the addition of Y improved further the eycling oxidation-resistance of the steel.SEM,AES,EPMA,and X-ray diffractions were employed tO characterize the oxidation products.On the basis of the results,the beneficial effects of Al,and in particular,of Y werebriefly discussed. Related Articles | Metrics | Comments（0）

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RESEARCH ON COUPLING LOSS BETWEEN THE SINGLE MODE OPTICAL FIBER AND THELINbO3 WAVEGUIDE SHEN QISHUN, GONG XIAOSHENG, QU WENYONG Journal of Applied Sciences    1994, 12 (3): 218-222.   Abstract （400）      PDF（pc） （283KB）（86）       Knowledge map    Save In this paper we investigated the influence of mismatch between the fiber and waveguide modes on the fiber-waveguide coupling loss. We measured the wavegu-ide mode width and depth versus the metal Ti strip width.By determining the appropriate waveguide parameters,it is found that the coupling loss between the fiber and waveguide is very low. Related Articles | Metrics | Comments（0）

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RAMAN SPECTRUM ANALYSIS OF STRESS DUE TO SILICON DIRECT BONDING HUANG QINGAN, ZHANG HUIZHENG, CHEN JUNNING, TONG QINYI Journal of Applied Sciences    1994, 12 (3): 223-226.   Abstract （471）      PDF（pc） （254KB）（85）       Knowledge map    Save A method of measuring the stress in silicon with the Raman spectrum is introduced. The stress due to silicon direct bonding is studied using the spectrum.It has been shown that there exists local tensile or oompressive stress in bonded silicon after high temperature bonding.The stress is as large as 7.5×103N/cm2. Related Articles | Metrics | Comments（0）

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RESEARCH ON FORMING THE FILM OF AMORPHOUS SUPERLATTICE MULTILAYER STRUCTUREAND ITS PHOTOPROPERTIES WU DINGXIANG, XU KEXI Journal of Applied Sciences    1994, 12 (3): 227-232.   Abstract （302）      PDF（pc） （385KB）（57）       Knowledge map    Save In this article the photochemical reaction is introduced by using ArF excimer laser of wave length 193nm to decompose the feed gases Si2H6 and C2H2 for fabricating the a-Si:H/a-SiC:H film of the amorphous superlattice multilayer structure. The photoproperties of the quantum size effect,the ultraviolet absorption,etc of such a film are discussed. Related Articles | Metrics | Comments（0）

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THE STRUCTURE AND STABILITY OF LAMELLAR LIQUID CRYSTAL WITH SHORT CHAIN ALCOHOL GUO RONG, YAN PENGQUAN, ZHU XIASHI, SHEN MING Journal of Applied Sciences    1994, 12 (3): 233-238.   Abstract （626）      PDF（pc） （350KB）（56）       Knowledge map    Save We found it possible to form the lamellar liquid crystal using alcohol with short chains as a cosurfactant in SDS/CnOH/H2O systems,the stability of the lamellar liquid crystal increased with the chain length of alcohol.The increase of interlayer spacing d with the chain length of alcohol was related to the d0 value and the penetration of solvent in the lamellar liquid crystal. Related Articles | Metrics | Comments（0）

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STUDY ON THE FORMING PRINCIPLE AND CONTROL TECHNOLOGY OF FORWARD BURR WANG GUICHENG Journal of Applied Sciences    1994, 12 (3): 239-245.   Abstract （440）      PDF（pc） （406KB）（100）       Knowledge map    Save This paper classified the forms of forward burrs in metal cutting on the basis of the cutting motion and tool outting edges.The principles of forming and the main influencing factors of forward burr are studied,and the related theories are analyzed.Thus a clear understanding of the types, and the forming process of the burrs is obtained. The physical quantity of determiuing the tear of forward burr-limit depth of cut αpr-is given. A oertain number of measures and new restraining methods to control and decrease the forward burrs are advanced. Related Articles | Metrics | Comments（0）

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THE CONNECTION METHOD WITH EQUALITY FOR AUTOMATED THEOREM PROVING MIAO HUAIKOU, WU MAOKANG Journal of Applied Sciences    1994, 12 (3): 246-252.   Abstract （357）      PDF（pc） （439KB）（70）       Knowledge map    Save This paper diseusses the connection method with equality in automated theorem proving.The formal definitions are given. The theorem that a logic formula with equality is eq-valid if and only if it has a complementary formal matrix of a compound instance is proved,and several algorithms about the connec-tion method with equality are designed. Related Articles | Metrics | Comments（0）

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