1987 Vol.5

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STRESS INTENSITY FACTORS FOR PERIODIC STIFFENED STRIPS WITH RANDOM CRACK AND/OR HOLE OUYANG CHANG, ZHOU XIAOKANG Journal of Applied Sciences    1987, 5 (1): 1-15.   Abstract （365）      PDF（pc） （807KB）（74）       Knowledge map    Save This paper diseusses periodio stiffened strips made with two different kinds of materials and each strip with a random oraek or hole. The strueture is under extension along the longitudinal direction. Stress intensity factors at the craek tips are computed by complex variable functions and perturbation method and formulas are given in power series forms. For applied structures in engineering, numerical tables and figures are given for stress intensity factors. These results extend further the contents of "Handbook of Stress Intensity Factors". Related Articles | Metrics | Comments（0）

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LASER SCANNING PHOTOELECTRIC MICROSCOPE ZHANG SHXIYI, CHEN LI, XU JIANSHENG Journal of Applied Sciences    1987, 5 (1): 16-21.   Abstract （386）      PDF（pc） （2651KB）（74）       Knowledge map    Save Using the photoelectrie effect of semiconductors (materials and devices), a new imaging detection system, photoelectric microscope, has been established. Some static and dynamic photoelectric imagings of several integrated circuits have been obtained by the microscope. Thee results show that the photoelectric microscope can be used not only to detect the static defects of various integrated circuits (including large scale integrated circuits), but also to search the logic levels and charges distributions in integrated circuits. It provides a convenient and effective, non-contacting and nondestructive technique that can be used in normal atmospheric circumstances for integrated circuits failure analysis. Related Articles | Metrics | Comments（0）

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EXPERIMENTS AND APPLICATIONS OF X-BAND FM-CW RADAR SYSTEM ON SEMI-SUBMERGED DRILLING WELL PLATFORMS ZHOU NANSHAN, TANG WEI Journal of Applied Sciences    1987, 5 (1): 22-29.   Abstract （411）      PDF（pc） （2441KB）（94）       Knowledge map    Save Introducing the design scheme and analysing the experimental results, the paper proves that the X-band liquid level guage made according to the FM-CW principle can be used on semi-submerged drilling well platforms. The theory and practice indicate that the operating distance to sea level is more than 30 meters for all weathers. Three static parameters:the water depth, the transversal and longitudinal dip angles are measured above waving sea using appropriate automatic data processing and the accurancy of the measurement is satisfying. Related Articles | Metrics | Comments（0）

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pn JUNCTION ANALYSIS WITH TRANSMISSION LINE EQUIVALENT CIRCUIT MODEL RUAN GANG, RONG MENGTIAN Journal of Applied Sciences    1987, 5 (1): 30-36.   Abstract （890）      PDF（pc） （437KB）（97）       Knowledge map    Save In this article, we analyse the pn junction injected by deep level impurity based on an exact transmission-line equivalent circuit model. We put forward the sche mes of program by modifying the model according to different pn junction, conducting mechaaism under various kinds of working status. The input parameters are doping profile, SRH coefficients of recombination centers and geometric parameters of pn junction. The program can provide pn junction ac and do characteristics and inner information such as density of carriers. The experiments show that the simulation results agree quite well with one of the measurements. Related Articles | Metrics | Comments（0）

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A STUDY ON α-COPPER PHTHALOCYANINE EVAPORATED FILM TRAP——AN ISOTHERMAL DECAY CURRENT SPECTRUM QIAN RENYUAN, ZHOU SHUQIN, JIN XIANGFENG, WAN ZENGQI, JIANG SHOUREN Journal of Applied Sciences    1987, 5 (1): 37-40.   Abstract （334）      PDF（pc） （250KB）（67）       Knowledge map    Save An investigation of Isothermal Decay Current (IDC) method on determining trap parameter has been made on the α-copper phthalocyanine evaporated films at different temperatures and electric fields. It shows that the trap behaves like a distributed trap of depth 0.58 eV and attempt-to-escape frequency 1.7×108 s-1. The field dependence of IDO current indicates a field assisted detrapping probably in the sense of Poole-Frenkel mechanism. Related Articles | Metrics | Comments（0）

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THE DIFFERENCE BETWEEN METAL IONS EXTRACTED FROM THE R. F. ION SOURCE BY APPLYING PLASMA CHEMISTRY REACTION AND NON-PLASMA CHEMISTRY REACTION BAI GUIBIN Journal of Applied Sciences    1987, 5 (1): 41-48.   Abstract （491）      PDF（pc） （455KB）（92）       Knowledge map    Save The paper introduces the difference between using plasma chemistry reaction and non-plasma chemistry reaction to draw metal ions from the E. F. ion source. Plasma chemistry reaction is applied to the E. F. ion source and the implanter successfully. The effect, having its own characteristics, is very satisfying. By means of plasma chemistry reaction combined with physics, metal ion beams, especially the beams of high volatility temperature, are obtained easily. These ions are:Re+, W+, Mo+, Y+, Nd+, Pd+, Au+, Ta+, Ti+, Cr+, Ce+, Ag+, Fe+, Cu+, V+, Al+, Be+, Li+, Si+, Ga+, In+, Bi+ and so on. Related Articles | Metrics | Comments（0）

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APPLICATION OF SIGNIFICANT STRUCTURE THEORY IN EVALUATION OF THERMODYNAMIC PROPERTIES OF LIQUIDS YAN WENHSING, SUN YAPING Journal of Applied Sciences    1987, 5 (1): 49-55.   Abstract （383）      PDF（pc） （415KB）（91）       Knowledge map    Save By modifying Eyring's significant structure theory, thermodynamic properties-molar volumes, entropies, molar heat capacities at constant pressure and constant volume——of liquid ethylene, ethane, hydrogen cyanide, carbon disulfide and pyridine are calculated. It is found that the results are in good agreement with experimental values. Related Articles | Metrics | Comments（0）

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SYNTHESIS AND PROPERTIES OF SEGMENTED POLYETHER URETHANEUREAS EXTENDED WITH WATER HUANG ZUXIU, FENG XINDE Journal of Applied Sciences    1987, 5 (1): 56-60.   Abstract （408）      PDF（pc） （1210KB）（79）       Knowledge map    Save Segmented polyether urethaneureas (SPEU-W) were synthesized from 4, 4'-diphenylmethane diisocyanate (MDI), polytetramethylene glycol (PTMG, Mn=1100) and water as chain extender by two-step solution polymerization. The physical properties and anticoagulant activity of the polymers prepared were measured. The experimental results showed that the extent of phase separation and the anticoagulant activity of SPEU-W were almost the same as those of polyether urethaneureas based on MDI, PTMG and ethylenediamine chain extender and better than those of polyether urethanes based on MDI, PTMG and butanediol chain extender. Related Articles | Metrics | Comments（0）

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A STUDY OF RADIATION DAMAGE IN (Hg·Cd)Te CRYSTAL BY HREM SONG XIANGYUN, WEN SHULIN, MA KEJUN Journal of Applied Sciences    1987, 5 (1): 61-65.   Abstract （365）      PDF（pc） （2198KB）（58）       Knowledge map    Save The microstructure of (Hg. Od) Te crystal was studied by HREM. An electron radiation damage was found along the[110] direction of the crystal. A further study of EDAX, HREM and electron diffraction showed that the CdTe phase could be segregated from (Hg. Od) Te crystal by electron radiation, and structure disordering could occur in some areas due to the radiation. Moreover, atom displacements were occurred in the (Hg. Od) Te crystal due to the electron radiation, resulting superlattice phenomenon in the crystal. Related Articles | Metrics | Comments（0）

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RF SPUTTERING OF InP FILMS LI XIQIANG Journal of Applied Sciences    1987, 5 (1): 66-71.   Abstract （338）      PDF（pc） （2156KB）（66）       Knowledge map    Save The present paper is a report on the deposition of InP films on different substrates by sputtering. Using SEM, AES, X-ray diffractions, RED and infrared spectrophotometer, we have studied the topography, composition, crystal orientation, absorption edge spectrum etc. Related Articles | Metrics | Comments（0） Cited: Baidu(1)

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RESEARCHES ON InP OHMIC CONTACT WU DINGFEN, WANG DENING, ZHANG JUN Journal of Applied Sciences    1987, 5 (1): 72-78.   Abstract （578）      PDF（pc） （482KB）（120）       Knowledge map    Save The values of specific contact resistance (p0) for both Au/n-InP and Au/p-InP have been calculated theoretically based on the carrier transport study of metal-semiconductor systems. The results, which are presented graphically, show the dependence of p0 on impurity concentration from 1018 to 1021cm-3, and the barrier height from 0.3~1.0 eV. It is found that the Schottky barrier height (φB) would not be changed with annealing temperature below 350℃ in 3 min. When the annealing temperature is higher than 350℃, a poor ohmic contact will be formed in the case of Au/n-InP system, but for Au/n-InP system, only a reduction of φB will be observed. It is determined that an obvious alloying takes place at about 350℃. The computed theoretical results are used to interpret the experimental data of Au Zn/p-InP ohmic contact published in the literatures and the problems exist in our p-type ohmio contact technology are discussed. Related Articles | Metrics | Comments（0）

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GENERATING ALL NONISOMORPHIC ROOTED TREES AND ALL NONISOMORPHIC TREES LLU JLAZHUANG Journal of Applied Sciences    1987, 5 (1): 79-84.   Abstract （673）      PDF（pc） （367KB）（74）       Knowledge map    Save In the present paper, the representative sequence of path lengths of a rooted tree and that of a tree is defined. It is found that between the treeg (resp. rooted trees) of order n-1 and that of order n, there exist simple relations between their sequences of path lengths. Making use of the relations, we obtain algorithms which generate the sequences of path lengths of all nonisomorphio rooted trees and all nonisomorphio trees. The storage required is less than that of the algorithm in[1], and the computer time required is less than that of the algorithm in[2]. Related Articles | Metrics | Comments（0） Cited: Baidu(1)

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MEASUREMENT OF XPS LINE SHAPE WIDENING FUNCTION XU ZHIZHONG, DONG SHUZHONG Journal of Applied Sciences    1987, 5 (1): 85-88.   Abstract （365）      PDF（pc） （235KB）（71）       Knowledge map    Save The transmission function of the electronic energy spectroscope can be obtained from XPS core level speotra by the deconvolution method. Making convolution of the frequency distribution function of X-ray source with it, we have calculated the XPS line shape widening function. The result agrees well with that obtained from the valence level speotra of transition metals. Related Articles | Metrics | Comments（0）

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MARCHUK MODEL AND RECOVERY FROM DISEASES SHAO JIAN Journal of Applied Sciences    1987, 5 (1): 89-91.   Abstract （320）      PDF（pc） （173KB）（56）       Knowledge map    Save Regarding the simple mathematical model of a virus disease suggested by G. I. Marchuk, a problem of time of recovery from diseases is suggested in this paper, We use the technique of dynamic programming for this problem. It is shown that the immunological level of plasmacytes in the organism must reach the suboptimal state in order that one may be recovered from virus diseases in a minimum amount of time. Related Articles | Metrics | Comments（0）

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RAPID MONOESTERIFICATION OF ADIPIC ACID AT A LOW TEMPERATURE GUI WEIZHI Journal of Applied Sciences    1987, 5 (1): 92-94.   Abstract （421）      PDF（pc） （187KB）（72）       Knowledge map    Save A new process of rapid monoesterification of adipio acid at a low temperature is introduced.It is found that the esterification can be carried out very economically for it can be carried out at a temperature as low as that of 80 C and can be heated up by evaporation of water, not necessarily by electrothermal. Moreover, corrosion can be avoided since catalysts of strong aoid and strong alkali are substituted by resin catalysts. And monoesterification can be fulfilled in half the time spent on ordinary processes. Related Articles | Metrics | Comments（0） Cited: Baidu(1)

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TRANSIENT EM FIELD SHEN HAOMING Journal of Applied Sciences    1987, 5 (2): 95-103.   Abstract （430）      PDF（pc） （640KB）（93）       Knowledge map    Save An introduction on transient EM field and EM pulse is presented. The application, properties, contents and methods of transient field are summed briefly. Related Articles | Metrics | Comments（0） Cited: Baidu(3)

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STRESS INTENSITY FACTORS FOR AN ELLIPTICAL CRACK UNDER ARBITRARY NORMAL LOADINGS OUYANG OHANG, XU LINLIN Journal of Applied Sciences    1987, 5 (2): 104-107.   Abstract （426）      PDF（pc） （215KB）（70）       Knowledge map    Save In this paper, the stress intensity factors of an elliptical crack under arbitrary normal loadings are given with the expansions of displacement potentials in Lame functions. Related Articles | Metrics | Comments（0）

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INTERPRETATION OF 4.2 K PL SPECTRA OF CERTAIN DEFECTS IN GALLIUM ARSENIDE ZOU ZHONGJI, ZOU YUANXI Journal of Applied Sciences    1987, 5 (2): 108-112.   Abstract （619）      PDF（pc） （369KB）（104）       Knowledge map    Save We suggest an empirical method for interpreting the 4.2.K PL spectra of certain complex defects. The essence of this method is assuming a constant k to take care of the difference in photoluminescenoe efficiency of certain coexisting defects. Some useful results have been obtained by applying this method to the interpretation of the 0.65eV and 0.80eV bands in the PL spectra of undoped, SI LEO GaAs reported in the recent literature. It is shown that the use of this method helps to shed some light on the nature of the defects involved. This success reflects the reasonableness and usefulness of the proposed method in interpreting 4.2 K PL spectra of certain semiconducting compounds, especially GaAs. In addition, the present results also support the common origin hypothesis for EL2 and the arsenic antisite AsGa as well as the strain model for EL2 proposed by one of the authors in two previous papers. Related Articles | Metrics | Comments（0）

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FARADAY ROTATION IN MONOMODE FIBRES WITH AXIALLY VARYING MAGNETIC FIELD QIAN JINGREN Journal of Applied Sciences    1987, 5 (2): 113-116.   Abstract （361）      PDF（pc） （257KB）（88）       Knowledge map    Save The Faraday rotation is studied using the coupled-mode theory and a simple integral formula is derived for calculating the total Faraday rotation in a monomode optical fibre produced by an axially varying magnetic field. It is also found that Miller's method is particularly useful in calculating the Faraday rotation produced in a fibre with periodic couplings. Related Articles | Metrics | Comments（0）

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A SIMPLE AND CONVENIENT METHOD OF MEASURING COMPOSITION OF LiNbO3 CRYSTAL LIU SIMIN, ZHANG GUANGYIN, EONG FANG, WU SIJIA, KANG WIE, LIU QIUXIANG Journal of Applied Sciences    1987, 5 (2): 117-122.   Abstract （377）      PDF（pc） （1317KB）（63）       Knowledge map    Save The birefringence of LiNbO3 crystals is measured using the method of laser "cone light" interference.. The precision is up to +0.001. Solid composition of LiNbO3 crystal is then obtained directly by using the "birefringence-solid composition" curve of LiNbO3 given by Oarruthers et al. It is found that this method is simple and convenient and is easy to practise. The precision is about an order of magnitude higher than that of chemical method. Related Articles | Metrics | Comments（0）

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ANALYSIS FOR DETERMINING DRAIN PIPE LOCATION AND SCALES ON MODEL MADE CRUCIBLES OF OPTICAL GLASS LIQUID WU JUNPENG, YANG WENXIONG, YU NAIHUA Journal of Applied Sciences    1987, 5 (2): 123-130.   Abstract （474）      PDF（pc） （488KB）（73）       Knowledge map    Save According to fluid mechanics, molecular diffusion and heat conduction, the paper offers a new theoretical analysis for determining the drain pipe location and its scales at a model-made crucible. This is very important in getting optical glass liquid of good quality. By calculating the glass liquid flow of a model-made crucible, we can determine the location of the drain pipe at the bottom of the crucible for eliminating "stripes" in the products.By computing the temperature field in the drain pipe, the paper yields the relationship among the minimum value of the length Lm, diameter D, Reynolds number Re and Prandtl number Pr of the glass liquid and offers a foundation for determining the length of the drain pipe. A calculation example and a formula for determining the diameter D of the drain pipe are given in the paper.It is believed that the analysis and calculation given here are of some value to designing mixers in chemical engineering industry. Related Articles | Metrics | Comments（0）

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APPLICATION OF SIGNIFICANT STRUCTURE THEORY TO THE STUDY OF THE TERNARY SYSTEM:BENZENE-CYCLOHEXANE-CARBON TETRACHLORIDE YEN WENHSING, SUN YAPING Journal of Applied Sciences    1987, 5 (2): 131-137.   Abstract （355）      PDF（pc） （420KB）（53）       Knowledge map    Save By its successful application to the study of binary system, the significant, structure theory was advanced to the study of the ternary system, benzene-cyclohexane-oarbon tetraohloride, in the evaluation of excess volumes, excess enthalpies and excess Gibbs free energies. The result agrees well with the published and calculated data. Related Articles | Metrics | Comments（0）

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EFFECT OF POLYSULFONE SEQUENCE LENGTH AND CONTENT ON THE PROPERTIES OF POLYSULFONE NYLON 6 BLOCK COPOLYMERS DING YOUJUN, QIAN JINXIN, JI GUIJUN, XIONG WEI Journal of Applied Sciences    1987, 5 (2): 138-146.   Abstract （402）      PDF（pc） （1511KB）（57）       Knowledge map    Save A series of rigid-rigid polysulfone-nylon 6 (PSF-N6) block copolymera containing polysulfone and nylon 6 segments of varying molar composition have been synthesized. The effect of PSF equence length and content on the prooessibility, heat-resistance, water-absorption and mechanical properties of the PSF-N6 block copoly-mers were studied. It has been shown that the processibility of the copolymer decreases when the amount and M. W. of PSF increases in the copolymers, and the glass transition temperature increases monotonically as a function of polysulfone content. As the polysulfone content increases, water-resistance of the copolymer increases, and the modulus decreases.Due to the semi-crystalline nature of PSF-N6 block copolymer, the solvent and environmental stress crack resistance of the copolymers are significantly improved comparing with that of the polysulfone homopolymer. The copolymers are more formic acid resistant than N6, presumably due to the introduction of polysulfone segments. Related Articles | Metrics | Comments（0） Cited: Baidu(1)

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EDTERMINATION OF PHASE DIAGRAM IN LOW LITHIUM REGION OF Li-Fe-S TERNARY SYSTEM BY ELECTROCHEMICAL TECHNIQUE WEN TINGLIAN, W. WEPPNER Journal of Applied Sciences    1987, 5 (2): 147-151.   Abstract （410）      PDF（pc） （357KB）（61）       Knowledge map    Save A solid state galvanic cell has been employed to determine the phase diagram of the ternary system Li-Fe-S in the temperature range from 360 to 550℃. Li4SiO4 +40m/o Li3PO4 was used as an electrolyte. According to the general principle to investigate the phase diagram with electrochemical coulometrio titration, the samples do not have to be quenched and only electrical quantities are required to be measured. Thus, the partial phase diagram of ternary system Li-Fe-S for the region of lithium content lower than 10 atom% and Fe:S atomic ratio bigger than 47:53 has precisely been constructed. Related Articles | Metrics | Comments（0） Cited: Baidu(1)

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MAGNETIC PROPERTIES AND THERMAL STABILITIES OF AMORPHOUS (Fe1-xNbx)84.5B15.5 ALLOYS SHEN BAOGEN, ZHAN WENSHAN, ZHAO JIANQAO, CHEN JINCHANG Journal of Applied Sciences    1987, 5 (2): 152-158.   Abstract （296）      PDF（pc） （452KB）（46）       Knowledge map    Save The ribbons of amorphous (Fe1-xNbx) 84.5B15.5 (x=0,0.02, 0.04, 0.06, 0.08, 0.1) alloys were produced by melt spinning. The saturation magnetization at 12 K Oe were measured with magnetic balance in the temperature range of 77-1200 K. Experimental results show that the curie temperature, Tc, linearly diminishes with increasing Nb content of the alloy, the rate of which is about l7.6 K/at% Nb. Related Articles | Metrics | Comments（0）

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ELECTRICAL SWITCHING EFFECT IN SOME TCNQ-ION-RADICAL SALT POWDER COMPACTIONS GUO DING, YE CHENG, YANG DALIN, QIAN RENYUAN Journal of Applied Sciences    1987, 5 (2): 159-163.   Abstract （414）      PDF（pc） （304KB）（74）       Knowledge map    Save Among 31 TONQ-ion-radical salts, electrical switching has been observed in powder compactions of Li-TONQ, Mn (TONQ) 2·3H2O, Cu-TCNQ, Cu (TCNQ) 2, Zn (TONQ) 2.xH2O and Ag-TONQ. These TONQ-ion-radical salt powder compactions were of 5 or 8mm diameter and approximately 300-600 μm in thickness with evaporated On and Al electrodes. The current-voltage characteristics revealed an abrupt decrease in resistance from 104-105 to 102-103 at a threshold voltage of 5-8 V. The ratio of Roff/Ron is tens to thousand times. Related Articles | Metrics | Comments（0）

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THE MEASUREMENT OF MINORITY CARRIER DIFFUSION LENGTH IN N LAYER OF N/P EPITAXIAL SILICON WAFER YANG HENQING, WANG ZHIWEI, BAO ZENGMING Journal of Applied Sciences    1987, 5 (2): 164-171.   Abstract （513）      PDF（pc） （487KB）（68）       Knowledge map    Save Using the photovoltaic spectral response of epitaxial P-N junction, the paper suggests a method of determining the minority carrier diffusion length in N layer of N/P epitaxial silicon wafer. The authors made a group of diagrams which contained the information of minority carrier diffusion lengths in the epitaxial layer and the substrate according to the theoretical analysis. When there is a thermal SiO2 thin film on the surface of the sample, the photovoltage of the sample depends on the characteristics of the epitaxial P-N junction. Related Articles | Metrics | Comments（0）

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THE MANUFACTURE OF ALCOHOL-SENSITIVE ELEMENT HUANG GUOFANG, CHEN WEIKANG Journal of Applied Sciences    1987, 5 (2): 172-175.   Abstract （290）      PDF（pc） （254KB）（58）       Knowledge map    Save By means of CVD method, the thin film of tin diohloride doped with a single foreign ion is deposited on the purified ceramic substrate. The raw material of the element is anhydrous tin tetrachloride doped with single foreign ion. The range of working temperature of the element is 250 to 360℃. In this range of temperature, the element can detect the existence of alcohol vapor of concentration 2r/ml in the air. The element is non-ohmic contact element. Its response time is about six minutes and its life time longer than 1,000 hours. Related Articles | Metrics | Comments（0）

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A NEW METHOD OF ELIMINATING WRONG ANSWERS FOR COMPUTER INDEXING THE LAUE PARTTERNN——THE ZONE RIGHT-HANDED METHOD GAO XIANGHONG Journal of Applied Sciences    1987, 5 (2): 176-179.   Abstract （633）      PDF（pc） （1155KB）（44）       Knowledge map    Save The zone right-handed method is proposed. An example of application of this method to eliminating wrong answers for computer indexing the Laue partternn is presented. It is found that this method is more simple than Hart's method[1]. Related Articles | Metrics | Comments（0）

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A METHOD FOR FITTING ASYMMETRIC DIFFRACTION LINE PROFILE AND SEPARATING Κα DOUBLET GUO CHANGLIN, LIU YUNJI Journal of Applied Sciences    1987, 5 (2): 180-184.   Abstract （524）      PDF（pc） （311KB）（74）       Knowledge map    Save Generally, the X-ray diffraction line profile is asymmetrical. A method for fitting the asymmetric diffraction line profile and separating the asymmetric Κα doublet is presented in this paper. According to the diffraction line profile fitting experiments for various functions, a method of a weighted Gauss-Oauchy combination function for asymmetric X-ray diffraction line profile is suggested. It has been proved by practical calculations that when the asymmetric profile function is employedin fitting practical diffraction line, the method is simple and convenient with sati-sfaetorily precise results. Related Articles | Metrics | Comments（0）

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ON-LINE MEASUREMENT OF PAPER MOISTURE USING INFRARED MOISTURE METER WANG JINSAN, YE ZENHUA Journal of Applied Sciences    1987, 5 (2): 185-188.   Abstract （720）      PDF（pc） （1194KB）（68）       Knowledge map    Save The infrared moisture meter (Model HWS) is an instrument for on-line measurement of moisture in paper. The absorption of two beams in the infrared range are compared using the infrared measuring method. The energy of one beam of wavelength 1.93 μm is absorbed by water molecules and is compared with the energy of a reference one of wavelength 1.78μm uninfluenced by water content. As the pathes of both rays through the tested material are the same, the ratio of the energies arriving at the detector is in direct relation to the moisture content of the material tested. The infrared moisture meter has been operating continuously for two years with an aocurancy better than 0.5% H2O. Related Articles | Metrics | Comments（0）

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TRANSIENT EM FIELD SHEN HAOMING Journal of Applied Sciences    1987, 5 (3): 189-196.   Abstract （417）      PDF（pc） （536KB）（86）       Knowledge map    Save An introduction on transient EM field and EM pulse is presented. The application, properties, contents and methods of transient field are summed briefly. Related Articles | Metrics | Comments（0） Cited: Baidu(3)

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SOME NEW APPROACHES TO DETERMINING MATERIAL FRINGE VALUE OUYANG CHANG, YE NING Journal of Applied Sciences    1987, 5 (3): 197-202.   Abstract （616）      PDF（pc） （1264KB）（90）       Knowledge map    Save In this paper, after a research for Photometric Compensation Methods on the-determination of non-integer isoohoromatio fringe order, two methods:Darkest Method and Intensity Method, to determine material fringe value are developed with a Digital Picture Computer. Here, authors deduced the fringe order formulas in Intensity Method, and established a Material Fringe Value Fast Determination System (YES system). Besides, another method, Gray Method, was also presented. With an axial tension plate, a pure bending beam and a diametral loaded disk as models, the determination of each material fringe method was performed. It takes only 3 to 4 minutes to make one determination with this system and the precision is high. This lays a foundation for Eeal Time Photoelasticity. Related Articles | Metrics | Comments（0）

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RESOLVING POWER OF DIFFRACTION LINES ON THE EQUATOR OF MONOCHROMATIC X-RAY FOCUSSING PHOTOGRAPH GUO CHANGLIN Journal of Applied Sciences    1987, 5 (3): 203-211.   Abstract （387）      PDF（pc） （1471KB）（87）       Knowledge map    Save In this paper, the various factors affecting the reselving power of diffraction lines on the equator of monochromatic X-ray focussing photograph are analyzed in detail. The relationship equations and calculated results of the broadening of diffraction lines caused by wavelength dispersion of X-ray characteristic spectra, wavelength difference of Kα-doublet, quality and inexact focussing of monoohro-mator, specimen thickness and grain size are given. According to the calculated and experiment results, the synthetic factor affecting the resolving power of diffraction line is discussed. Related Articles | Metrics | Comments（0）

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BRILLOUIN SCATTERING IN PIEZOELECTRIC SEMICONDUCTOR CRYSTAL ZnO ZHENG HAOPING, ZHAO MINGZHOU Journal of Applied Sciences    1987, 5 (3): 212-219.   Abstract （519）      PDF（pc） （480KB）（106）       Knowledge map    Save The derivation of the acoustic wave equation which is valid for piezoelectric semiconductor crystals of any symmetry and for any acoustic propagating direction is presented. Three mechanisms contributing to Brillouin scattering in high resistivity ZnO crystal are analysed. They are the elasto-optic effect, rotational contribution of shear wave and the electro-optic effect induced by the aocompaning potential. Thermal Brillouin scattering in ZnO crystal is performed. All of five independent elastic constants of ZnO crystal in high frequency range at room temperature are measured and the values are smaller than those reported in lower frequency by about 4.5%. Four photoelastio coefficient relations are given and the curve of the reciprocal velocity of quasi-longitudinal acoustic wave in x-z plane 10 depicted. Related Articles | Metrics | Comments（0）

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INVESTIGATIONS OF ELECTRICAL PROPERTIES OF m-NITROANILINE (m-NA) CRYSTAL SHI ZIKANG, HUANG GONGPAN, SU GENBO Journal of Applied Sciences    1987, 5 (3): 220-224.   Abstract （328）      PDF（pc） （326KB）（63）       Knowledge map    Save The m-nitroaniline crystal is a new polar crystal material. Single crystal samples with dimentions of 50×40×30mm3 have been grown in our laboratory. Its electrical properties such as the dielectric constant, dc-, ac-resistivity, loss angle in the orientation of no-polar axes, and pyroelectric character near melting point are investigated and cited for the first time. Related Articles | Metrics | Comments（0）

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A STUDY OF MAGNETIC PROPERTIES AND FERROMAGNETIC RESONANCE OF (Co0.95-xFe0.05Nbx)74B18Si8 AMORPHOUS ALLOYS LI DEXIN, LI GUODONG, ZHANG WUXIN, TANG WEIZHONG Journal of Applied Sciences    1987, 5 (3): 225-230.   Abstract （339）      PDF（pc） （411KB）（82）       Knowledge map    Save The paper investigates the effect of a small quantity of Nb on amorphous alloys CoFeBSi using magnetic measurement and differential thermal analysis. Using a ferromagnetic resonance method, magnetic properties of anisotropies are studied and so is the effectss of heat treatment on the anisotropies. Related Articles | Metrics | Comments（0）

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DESIGN AND MANUFACTURE OF WAVEGUIDE ELECTROOPTIC BRAGG GRATING LENSES XU ZHENGQUAN, LIU ZITING Journal of Applied Sciences    1987, 5 (3): 231-237.   Abstract （405）      PDF（pc） （2948KB）（89）       Knowledge map    Save This paper hag probed into a new type of waveguide lenses which may be called the waveguide eleotrooptio Bragg grating lens. According to the eleotrooptio effect of eleotrooptio-crystal and the principle of diffraction of Bragg grating, the refractive index change can be induced in the waveguide under an aluminum electric pole when a suitable do voltage is applied to it and the chirped grating with inclined stripes is formed. The pole is a chirped interdigital one with inclined stripes made with conventional lithographical technique. The grating diffracts and focuses the incident light beam and acts as a lens. This type of lenses has the advantages of being simple in manufacturing and easy in integrating with other components of integrated optics. Our grating has a 40mm focal length and 14μm diameter focal spot. Related Articles | Metrics | Comments（0）

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MODULATION TRANSFER FUNCTION MEASUREMENT OF TV PICTURE TUBE SHEN GUOHUA, PAN YULIAN, WANG MINGLUE, FAN CHENGSHAN Journal of Applied Sciences    1987, 5 (3): 238-243.   Abstract （377）      PDF（pc） （417KB）（114）       Knowledge map    Save A new instrument for modulation transfer function (MTF) measurement of TV picture tube has been designed. It can measure MTF of different areas on screens under different conditions with precision up to +3%, and the resolution is measured in accordance with the standards issued by the National Bureau of Standards, the People's Republio of China. A way to avoid false resolution phenomenon when using a compression method is given in the paper. Related Articles | Metrics | Comments（0）

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NUMERICAL MODELING OF SUPERSONIC FLUORINE/HYDROGEN COLD FLAME IN LAMINAR MIXING REGIME ZHUANG QI, FENG HAO, LI MU, LI ZHONGYUAN Journal of Applied Sciences    1987, 5 (3): 244-248.   Abstract （361）      PDF（pc） （291KB）（88）       Knowledge map    Save By using a two-dimensional boundary layer model, the temperature, HF(v) concentrations and Mach number profiles of the cold flame, as well as the relation of flame length to the lateral diffusion distance are obtained. The calculations were performed on a Nord 500 digital computer. The Fortran code is programmed by using Gear's automatic numerical integration method. Related Articles | Metrics | Comments（0）

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