1986 Vol.4

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THE PRINCIPLE OF FEL OPERATION IN A LONGITUDINAL UNIFORM MAGNETIC FIELD CHENG GANZHEN Journal of Applied Sciences    1986, 4 (1): 1-7.   Abstract （335）      PDF（pc） （467KB）（89）       Knowledge map    Save This article discusses the principle of FEL operation in a longitudinal uniform magnetic field for the main problems in the development of FEL. A new approach of energy compensation is presented as a new basis for the development of FELresearch. Related Articles | Metrics | Comments（0） Cited: Baidu(3)

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THEORY AND COMPUTATIONS FOR 3-DIMENSIONAL PROBLEMS OF MULTI-CRACKS (Ⅱ) NUMERICAL COMPUTATIONS AND EXAMPLES OUYANG CHANG, XU LINLIN Journal of Applied Sciences    1986, 4 (1): 8-15.   Abstract （322）      PDF（pc） （419KB）（72）       Knowledge map    Save This is Sec. Ⅱ of the paper "Theory and Computations for 3-Dimensional Problems of Multi-Cracks",[1]. With the method and formulations given in[1], here we give numerical results for examples of two parallel oraoks with the same radius but in different planes. Detailed results are ghiven for various oases which indicate the interaction between cracks. It is shown that the method proposed here is quite workable, and the results obtained enlarge the contents of "Handbook of Stress Intensity Factors"[2, 3]. Related Articles | Metrics | Comments（0）

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A STUDY ON THE SPACE CHARGE SCATTERING CENTERS IN UNDOPED VPE GaAs SHAO JIUAST, ZHOU YUAKXI, PENG RUIWU Journal of Applied Sciences    1986, 4 (1): 16-21.   Abstract （351）      PDF（pc） （403KB）（73）       Knowledge map    Save In this paper, the product of space charge density and scattering cross section has been calculated from the measured room temperature mobility by the use of Matthiessen's rule. A linear relationship between NSCA and ND has been found. On the basis of this relationship, the space charge center presented in undoped VPE GaAs epilayers is postulated to be a complex of the SiGa (O1, V1) type. Besides, an in site sulpher remover has been designed and used in the AsCl3-Ga-H2 epitaxial system for the first time, and found to be quite effective in depressing the carrier concentration of the epilayers. Related Articles | Metrics | Comments（0）

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THE EFFECT OF PRESSURES ON THE DIFFUSE PHASE TRANSITIONS OF POLYCRYSTAL FERROELECTRIC PbMg1/3Nb2/3O3 JIN BIANJUN, ZHONG FAN, WANG XIANGQTJAN, SHEN JIAQI Journal of Applied Sciences    1986, 4 (1): 22-27.   Abstract （359）      PDF（pc） （381KB）（80）       Knowledge map    Save The behaviour of the dielectric constant s of polyerystal ferroelectric PbMg1/3 Nb2/3O3 was measured in the temperature range -196℃-50℃ at the different pressures and the ε-P relation was obtained. The results were analysed by the statistical model of diffuse phase transition and the effect of pressures on diffuse phase transitions was discussed. Related Articles | Metrics | Comments（0）

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THE INPUT IMMITTANCES OF COUPLED ANTENNAS OF ARBITRARY-SHAPED WIRES ZHANG WENXUN Journal of Applied Sciences    1986, 4 (1): 28-35.   Abstract （330）      PDF（pc） （436KB）（101）       Knowledge map    Save In this paper the simultaneous integro-differential equations of two arbitrary-shaped thin-wire antennas with point-exitation are given. The formulas to determine the input self-and mutual-immittances are derived using the moment method. These formulas can be simplified by means of rational selection of basis functions and weighting functions. The mutual impedances of parallel circular-loops and coplanar dipoles are calculated as examples respectively, which are found to agree with the experimental data. Related Articles | Metrics | Comments（0）

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COUPLING COEFFICIENTS FOR DISTRIBUTED FEEDBACK LASERS CAO ZHANGQI, FANG JUNXIN Journal of Applied Sciences    1986, 4 (1): 36-42.   Abstract （555）      PDF（pc） （382KB）（119）       Knowledge map    Save We have analysed and calculated the coupling coefficients for TE mode of the periodic structure in distributed feedback lasers by the method of characteristic matrix. Simple analytic results of coupling coefficients expressed as functions of film corrugation shape, height and film thickness are here presented. Equations for various corrugation shapes such as rectangular, sinusoidal, symmetrical-triangular and sawtooth are evaluated. It is shown that the accuracy of the formulae we derived is quite good. Related Articles | Metrics | Comments（0） Cited: Baidu(1)

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SINGLE-MODE FIBER DISPERSION MEASUREMENTS AT 1.3μm WAVELENGTH REGION YAO HUIHAI, CHEN JUNFU Journal of Applied Sciences    1986, 4 (1): 43-48.   Abstract （561）      PDF（pc） （1962KB）（100）       Knowledge map    Save The principle of operation, design, construction and measured results of time-domain measurement system using pulse spreading are presented in this paper. All of the elements and devices used in this system are made in China. The system can be used to measure single-mode fiber dispersion at longer wavelength (1.3μm). It is shown by the measured results and analyses that the system is applicable to multi-mode fiber dispersion measurement and photodeteotor response time measurement with high accuracy. For single-mode[fiber dispersion measurement, the relative error can be better than 3% if the test fiber is longer than 10km. When the test fiber is shorter, the relative error becomes worse. However, it is still applicable to identify whether a single-mode fiber meets the dispersion specification of 6ps, kru-nm at 1.3μm wavelength region. Related Articles | Metrics | Comments（0）

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IMPULSE RESPONSE MEASUREMENT THE ELECTROMECHANICAL COUPLING FACTOR kt OF THICKNESS MODE PIEZOELECTRIC RESONATOR WANG XIAOGUANG Journal of Applied Sciences    1986, 4 (1): 49-53.   Abstract （380）      PDF（pc） （1036KB）（79）       Knowledge map    Save The pulse response voltage of a piezoelectric circular disk resonator excited by an external voltage is discussed. The voltage is the superposition of a pulse exponential decay resulted principally from the discharging of the clamped capacity of the resonator through R, the resistance of the circuit, and a decaying high frequency oscillation resulted from the piezoelectric effect of the resonator by the applied pulse voltage.lt is shown that the amplitude of the high frequency oscillation is dependent on the electromechanical coupling factor K of the resonator when adequately adjusting the width of the initial pulse voltage and R, the resistance of the circuit. A new method for measuring thickness model electromechanical coupling factor kt of the piezoelectric resonator is presented.The advantages of this method are simpler equipments and exact results. It is found that the measuring results of some samples using this method are in good agreement with the data obtained from measuring with the conventional method. Related Articles | Metrics | Comments（0）

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FAST ALGORITHMS FOR TRANSPOSING LARGE MATRICES USING MICROCOMPUTER OR MINICOMPUTER YU RENKANG, LIU CHONGQING Journal of Applied Sciences    1986, 4 (1): 54-60.   Abstract （462）      PDF（pc） （413KB）（67）       Knowledge map    Save The purpose of this paper is to present three algorithms for transposing large matrices of whnich data are larger than main memory available. The data can be stored on external storage device, such as disk or magnetic tape. The transposing operations using 128*256 matrices have been carried out on PDP11/24 minicomputer. Experimental results demonstrated that tie algorithms could realize a speed advantage. Related Articles | Metrics | Comments（0）

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XPS ANALYSIS OF Ag AND T1 IN ION MIGRATION LINBO3 OPTICAL WAVEGUIDES ZHANG XIAOYANG, LI CHUAN, CHEN GUANGMENG, CHEN YIXIN Journal of Applied Sciences    1986, 4 (1): 61-65.   Abstract （393）      PDF（pc） （324KB）（57）       Knowledge map    Save In this paper the X-ray Photoeleotron Spectroscopy (XPS) analysis on the LiNbO3 waveguide samples is reported. The samples were prepared by ion migration enhanced by electric field. The elements such as Ag, Tl, Nb and O in the different mode number waveguide planes on both the positive and the negative sides were measured. The depth profile of Ag and Tl ions in the waveguide layer was analysed. The results show that the Nb+5 in the LiNbO3 samples prepared by this method has no change of valency. The concentration of Ag+ on the positive guide side increases with the salt-bath time, but there isn't similar rule on the negative guide. The results of depth profile analysis show that the migration depth of Ag+ and Tl+ ions is about 500~2500Å. The ion distribution in the positive guide layer presents a step, then decreases as a complementary error function. Whereas the ion distribution in the negative guide layer is a complementary error function. Compared with the calculated results of optical measurement, the migration depth of the Ag+ and Tl+ ions is less than the 1/10 depth of the waveguide layer. Related Articles | Metrics | Comments（0）

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MEASUREMENT ACCURACY ANALYSIS OF THE GROUND SCATTEROMETER YU SHUNDI, ZHU WEIZHONG, XU SAIQING Journal of Applied Sciences    1986, 4 (1): 66-71.   Abstract （344）      PDF（pc） （401KB）（74）       Knowledge map    Save The measurement accuracy of the groud scatterometer is discussed in this article. Various factors -which can give rise to measurement error of this instrument are analysed. And it is pointed out that the stability of the following radar para-meters is very important for ensuring the measurement accuracy:transmitter power, gain of the receiver, wavelength, pointing corner of the beam, sidelobe levels, and nonlinear sweeping frequency. A method used to define the error which is caused by nonlinear sweeping frequency is developed. Related Articles | Metrics | Comments（0）

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AN APPROXIMATE CALCULATION OF THE CAPACITANCE OF AN IDT OVER A PIEZOELECTRIC LAYERED STRUCTURE YUAN JINGHONG, LIU XIAOXIA Journal of Applied Sciences    1986, 4 (1): 72-78.   Abstract （456）      PDF（pc） （443KB）（135）       Knowledge map    Save To calculate the interelectrode capacitance, two approximate formulas of an IDT on a piezoelectric layered structure are obtained by assuming a simple potential function and a simple electric charge density function on the intersurface of IDT. For the different values of the electrode width factor a, i. e. When a<3/8, S/8<a< 6/8 and a>5/8, the approximate values of the calculated capacitance are very good. Related Articles | Metrics | Comments（0）

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A NEW CRYSTAL BaO·Nd2O3·Al2O3·6B2O3 AND ITS CRYSTALLOGRAPHIC STUDY KONG HUASHUANG, HE CHONGFAN, WANG PEILING, LI DEYU Journal of Applied Sciences    1986, 4 (1): 79-83.   Abstract （318）      PDF（pc） （1658KB）（83）       Knowledge map    Save We have found a new crystal whose composition is BaO·Nd2O3·Al2O3·6B2O3 while studying the miorolaser crystal NAB[NdAl3 (BOs) 4]. The crystal is in sheet shape and is light purple. It possesses hexogonal symmetry. The unit cell parameters are a=4.566 (2) Å, c=24.93 (1) Å. This paper describes its growth conditions and crystallographio study. Under convergent polarized light, the interference pattern of its uniaxial crystal was observed, and the crystal was determined to be positive light crystal. Fluorescence spectrum was also measured at room temperature Related Articles | Metrics | Comments（0）

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AN INVESTIGATION OF MBS RESIN YE JINYONG, WANG WEI, SHEN HONG Journal of Applied Sciences    1986, 4 (1): 84-89.   Abstract （445）      PDF（pc） （1211KB）（80）       Knowledge map    Save Poly-cis-1, 4-butadiene was dissolved in methyl methacrylate and styrene, the bulk polymerization was carried out at 110℃ An impact transparent MBS resin was obtained. The relationship between the shear rate in bulk polymerization and the morphology of rubber phase, impact strength, gloss, fluidity and transparency of MBS resin had been investigated. The effect of M. W. of matrix on the impact strength was discussed. A new regulator, a-methyl styrene dimer had a similar effect as text-dodeoyl meroaptan in bulk-suspension poly-merization of MBS resin. Related Articles | Metrics | Comments（0）

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A NEW CHART FOR TRANSFORMATION FROM LAUE PHOTOGRAPH TO STEREOGRAPHIC PROJECTION OF CRYSTAL WEI GOANGPU Journal of Applied Sciences    1986, 4 (1): 90-92.   Abstract （416）      PDF（pc） （202KB）（73）       Knowledge map    Save A new char t for transformation from Laue photograph to storeographic projection of crystal and its principle were described. This chart can be used to transmission or back-reflection Laue photographs. Related Articles | Metrics | Comments（0）

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GLOBAL OPTIMIZATION OF A CLASS OF DISCONTINUOUS FUNCTIONS ZHENG QUAN Journal of Applied Sciences    1986, 4 (1): 93-94.   Abstract （607）      PDF（pc） （132KB）（89）       Knowledge map    Save In this letter the concepts of robust set and a class of discontinuous functions are introduced. The global optimality contions and algorithm for finding global minima of this kind of functions are given. Related Articles | Metrics | Comments（0）

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A MATHEMATICAL MODEL FOR MICROBIAL MUTAGENESIS AND THE DESIGN OF MUTAGENIC BREEDING LIU CHUIYU Journal of Applied Sciences    1986, 4 (2): 95-104.   Abstract （325）      PDF（pc） （740KB）（77）       Knowledge map    Save The expression of mutagenesis on polygenic system which controls a quantitative character of microbe can be represented by a mixed distribution. A mathematical model for microbial mutagenesis on populational level is a uniform-mutagenic distribution (i. e. a mixed distribution of two normal distributions). Related Articles | Metrics | Comments（0） Cited: Baidu(1)

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THE FUNCTION AND PROPERTIES OF SYNCHRONOUS PRECESSING ELECTRO-MAGNETIC FIELD IN FEL IN LONGITUDINAL UNIFORM FIELD CHEKG GANZHEN Journal of Applied Sciences    1986, 4 (2): 105-110.   Abstract （367）      PDF（pc） （372KB）（76）       Knowledge map    Save In this paper, an actual and effective realization of the principle of the FEL operation in a longitudinal uniform magnetic field is discussed. It recommends a synchronous spiral quasi-static electro-magnetic field and a synchronous spiral resonant cavity electro-magnetic field to be used as two kinds of energy compensation of FEL in a longitudinal uniform magnetic field, and a synchronous spiral static-electric field as a starting gyration and tapering gyration for electron beam. A brief description is given to their function, characteristics and feasibility. Related Articles | Metrics | Comments（0）

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MATHEMATICAL MODELS OF ROUNDNESS ERROR ASSESSMENT AND THEIR SOLUTION XIAO DONG, LUO XINHONG, ZHU XUNSHENG Journal of Applied Sciences    1986, 4 (2): 111-117.   Abstract （462）      PDF（pc） （460KB）（153）       Knowledge map    Save This paper discusses how to determine, according to the profile of a circular workpiece, the roundhesa errors with, respect to different kinds of reference circles. The mathematical models of these reference circles are strictly denned. The roundness error results are obtained by making use of the optimization technique. Some related problems are also discussed. Related Articles | Metrics | Comments（0） Cited: Baidu(4)

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1-D IMAGING BY REFLECTION OF ACOUSTIC WAVE IN SEISMIC EXPLORATION HUANG GUANGYUAN, XU WENTIAN, FU GUOHUA, QIU ZONGFANG, YANG BAOZHE Journal of Applied Sciences    1986, 4 (2): 118-125.   Abstract （394）      PDF（pc） （486KB）（85）       Knowledge map    Save In this paper we present a new method to solve the inversion of 1-D wave equation for seismic exploration. This method is based on the principle of pulse variation given by Ref. 5 and is more efficient than the one given by Refs.3-4 Some examples show its feasibility. Related Articles | Metrics | Comments（0） Cited: Baidu(4)

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THREE CATHODES OF TANTALUM COMPOUNDS FOR FIELD-EMISSION GUNS JIANG XIANGQI, KATO TAKEO Journal of Applied Sciences    1986, 4 (2): 126-131.   Abstract （339）      PDF（pc） （2573KB）（92）       Knowledge map    Save Tantalum tips with radius 0.1-0.5μm had been prepared by electrochemical etching, and then field-emission cathodes of tantalum nitride (Ta2N) tantalum carbide (Ta C), and tantalum carbide-nitride (TaNxCy) with Ta-core were prepared by solidgas reaction on the surface of Ta tips. Typical field-emission patterns and work functions Regarding fild-emission characteristics were given. It is shown that tantalum compounds are promising materials for field emitters. Related Articles | Metrics | Comments（0）

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BOUND ELECTRON PAIRS IN ELECTRON BEAM YE LUNYAN Journal of Applied Sciences    1986, 4 (2): 132-138.   Abstract （315）      PDF（pc） （424KB）（102）       Knowledge map    Save This paper gives a quantum mechanical analysis of the interaction between the electromagnetic field and the electron beam of free electron stimulated emission devices or linear electron accelerator. It is believed that the electron structure of electron beam consists of bound electron pairs with zero spin and the electron pair has some properties of the boson. Related Articles | Metrics | Comments（0） Cited: Baidu(1)

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THE INTERMODULATION CHARACTERISTIC AND THE OPTIMUM OPERATING POINT FOR SATELLITE TRANSPONDERS YAN FANG Journal of Applied Sciences    1986, 4 (2): 139-149.   Abstract （413）      PDF（pc） （644KB）（82）       Knowledge map    Save In this paper, a few recurrence formulas of the three-order mnltioarrier/total intermodulation-power ratio for different number of carriers through a satellite communication transponder are given. Thus, a programme-calculated method for the optimum operation point is put forward. Some engineering design charts under the condition of different parameters of satellite communications are given. By means of the charts, the designers of the overall system can focus their attention tin analysis and comparison without being involved in complicated calculations. Some examples are given for confirmation and application. Related Articles | Metrics | Comments（0）

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SOLUTION TO THE SURFACE IMPEDANCE PROBLEMS OF THE PERIODIC NOTCHED PLANAR STRUCTURE USING THE WIENER-HOPF METHOD FENG ZUWEI Journal of Applied Sciences    1986, 4 (2): 150-157.   Abstract （450）      PDF（pc） （451KB）（76）       Knowledge map    Save In this paper, the basic property of the electro-magnetic wave propagation on a periodic notched planar structure is analysed and is pointed out that it is often necessary to simplify this kind of problems into boundary value problems in the boundary impedance condition. The key to the problem is to determine the surface impedance, when the period of the structure is not too long and the notch wall sufficiently thin, we can define equivalent surface reactance by reference to the reflection of the plane wave, and the problem of periodic notched structure can be approximately solved according to the condition of the uniform surface reactance. The approach of normal component of the electrical field on the periodic notched structure being expanded into the Fourier integral has been used and the functional equations are set up according to the boundary condition. Using the Wiener-Hopf method, expressions of the secondary field and reflection coefficients are obtained, and Finally the expression of the surface reactance is found. The measured results are in good agreement with those found by theoretical methods. Thus, it is of practical value to simplify analytic and calculating methods of electromagnetic propagation and scattering on the periodic notched planar structure. Related Articles | Metrics | Comments（0） Cited: Baidu(1)

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PERTURBATION OBJECTS FOR MICROWAVE FIELD STRENGTH MEASUREMENT GU MAOZHANG Journal of Applied Sciences    1986, 4 (2): 158-164.   Abstract （321）      PDF（pc） （414KB）（74）       Knowledge map    Save Resonant frequency shift of a cavity perturbed by spherical, prolate or oblate objects with dielectric materials or materials having a permeability different from μ0 is presented. Metal perturbators could be considered as perturbatorg with|εr|→ ∞ and|μr|→0. Related Articles | Metrics | Comments（0）

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MEASURING THE TERRAIN SCATTERING COEFFICIENT WITH AN X-BAND GROUND-BASED SCATTEROMETER XU SAIGING, ZHU WEIZHONG, YU SHUNDI Journal of Applied Sciences    1986, 4 (2): 165-170.   Abstract （356）      PDF（pc） （338KB）（74）       Knowledge map    Save A method for measurment of terrain scattering coefficient is presented. In addition, a calculable method of effective illumination area for microwave scatterometer is discussed. Related Articles | Metrics | Comments（0） Cited: Baidu(6)

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THE EXPERIMENTAL DETERMINATION OF THE GAIN CHARACTERISTIC CURVES OF ELECTRON MULTIPLIER HOU XIAOYUAN, YU MINREN, WANG XUN Journal of Applied Sciences    1986, 4 (2): 171-174.   Abstract （473）      PDF（pc） （266KB）（68）       Knowledge map    Save The gain vs electron energy characteristic curves of an electron multiplier have been measured in an electron spectrometer by changing the pass energy of its energy analyser to introduce the Ni3p photoelectrons with different energy into the electron multiplier. It is found that the gain character varies with different multiplier voltages. The effect of this character On the measurement of AES peak-to-peak heights has been investigated. Related Articles | Metrics | Comments（0）

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EFFECT OF SOLID PARTICLES ON RHEOLOGICAL PROPERTIES IN CONCENTRATED SUSPENSIONS ZHU WANZHANG Journal of Applied Sciences    1986, 4 (2): 175-181.   Abstract （360）      PDF（pc） （443KB）（78）       Knowledge map    Save The effects of the volume fraction of solid particles, φ, the ratio of particle diameters, R, and the volume fraction of small particles in solid amount, φs, on rheological properties in concentrated suspensions were studied. Commercial ammonium perchlorate and aluminium powder were used as dispersed phase, and a polyether diol as continuous phase. In bimodal dispersed systems the viscosity of the systems is minimum at φs=0.30, and decreases as R decreases. The influence of small particles is shown to be very important in the pseudoplastic behavior of concentrated suspensions. With the increase of small particle content or the decrease of particle diameter ratio in suspension, the pseudoplastio extent of the system increases. The effects of φ and φs on system become stronger when non-spherical particles exist in suspension. In bimodal system with wide distribution of spherical particle size the effect of φ on the pseudoplasticity of the system is less than that in the system with narrow distribution. Related Articles | Metrics | Comments（0）

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AUTOMATIC SENSITIVE METHANE SEMICONDUCTOR WARNER ON MINER'S LAMP WANG CHUNGJI, LI PEIDE, ZHANG SHUXIAN, HAN ZHONGYI, LI XIAOYUN, SUN YUXIANG Journal of Applied Sciences    1986, 4 (2): 182-185.   Abstract （348）      PDF（pc） （252KB）（71）       Knowledge map    Save The CH4 sensitive semiconductor material was prepared from a high purity uonstoichiometrio n-type β-SnO2-x. A ceramic CH4 sensor was made from In, Pd-doped SnO2-x. The CH4 sensor was mounted on a miner's lamp, and the miner's lamp battary was used as the power supply. A new automatic methane warner has thus been developed and tested in some mines. When the CH4 sensor on the warner contacts with CH4 of over 1% concentration, the lamp automatically gives successive flash warnings. Related Articles | Metrics | Comments（0） Cited: Baidu(2)

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TWO IMPROVED ALGORITHMS OF CONSTRUCTING RSNF LIU YONGCAI Journal of Applied Sciences    1986, 4 (2): 186-188.   Abstract （323）      PDF（pc） （158KB）（72）       Knowledge map    Save J. E. Savage has developed an algorithm of constructing Boolean function's ring-siim normal form (RSNF),which is based on disjunction normal form (DNF). In this paper the complexity of Savage's algorithm ≤ 2·3n-2n-1 is obtained (the upper bound can be achieved) and two direct algorithms of constructing BSNF are given. The complexities of the two direct algorithms are the same, being 3n -2n. Related Articles | Metrics | Comments（0）

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Thermodynamical Theories Survey and Comoparison W. MUSCHIK Journal of Applied Sciences    1986, 4 (3): 189-200.   Abstract （424）      PDF（pc） （804KB）（63）       Knowledge map    Save Each survey of a field is based on a subjective choice and valuation of the subject which can not be undertaken without any arbitrainess. Related Articles | Metrics | Comments（0）

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LOW ALTITUDE PERFORMANCE OF DOPPLER NAVIGATION RADAR ANALYSIS AND CALCULATION LIU KUOTING, WANG YINGJUN Journal of Applied Sciences    1986, 4 (3): 201-206.   Abstract （355）      PDF（pc） （402KB）（67）       Knowledge map    Save The paper is in 2 parts. The first part is the analysis of why the low altitude is limited in frequency modification continuous wave Doppler navigation radar. It demonstrates that the radar works at zero altitude when J1 (M1) side frequencies are adopted. Here, J1 (M1) is the first order of Bessel function. Otherwise, there is a limitation in minimum altitude. The calculation method for this minimum working altitude is deduced. The second part is the analysis of why there is a low altitude limitation in pulse Doppler navigation radar and a simple and direct method for calculating the minimum working altitude is deduced. This method is used to calculate the minimum working altitude of AN-APN-220C Doppler navigation radar. It is found that the result is in agreement with the value measured by TELEDYNE RYAN Co. in U. S. A. Related Articles | Metrics | Comments（0）

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SINGLE-BEAM PHOTOACOUSTIC SPECTROSCOPE SYSTEM QIU SHUYE, ZHANG SHUYI, HU CHUNNIAN, WEI LANHUA Journal of Applied Sciences    1986, 4 (3): 207-212.   Abstract （422）      PDF（pc） （397KB）（73）       Knowledge map    Save A single-beam photoaooustio spectroscope system with the spectrum normalized by means of a microcomputer is described. The evaluation of the system is done by analyzing the spectrum of Ho2O3. Photoacoustio spectra for several samples, such as different types of iron oxides crystallines, abnormal bloods and some chomioal materials are obtained. These preliminary applications show that photoaooustic technique is a very useful tool for research and analysis work in the fields of physics, chemistry and medical sciences. Related Articles | Metrics | Comments（0） Cited: Baidu(20)

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STUDYING THE STRUCTURE OF NaY ZEOLITE WITH VARYING DEHYDRATION LEVEL USING X-RAY POWDER DIFFRACTION YU YINLIANG, ZHENG PCIU, XU ZISHENG, CHENG MINGQIN, WANG BOY Journal of Applied Sciences    1986, 4 (3): 213-218.   Abstract （324）      PDF（pc） （416KB）（78）       Knowledge map    Save The four samples with varying water content were kept in double layer plastic bag. The intensity data up toS (H2+K2+L2)=384 were collected on a 12kW powerful rotating anode X-Ray diffraotometer in step scan mode. The coordinates and occupancy factors of sodium ions and water molecules were determined by F0 and △F syntheses. The structure was refined by least-square method. The values of R were below 0.16. The bond lengths and bond angles derived from coordinates fell in normal ranges. This study has shown the following results. On removal of water molecules, sodium ions in superoages migrate toward β cages and hexagonal prisms. In addition, sodium-water interactions decrease and sodium-oxygen interactions increase in dehydration process. Related Articles | Metrics | Comments（0）

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THE DRAWING METHOD OF THE TRAJECTORIES OF INCIDENT ELECTRONS WITH GAUSS DISTRIBUTION IN SOLIDS BY MONTE CARLO SIMULATION HE YANCAI, CAO LIQUN Journal of Applied Sciences    1986, 4 (3): 219-225.   Abstract （351）      PDF（pc） （1810KB）（77）       Knowledge map    Save The trajectories of incident electrons with Gauss distribution in solids were calculated and drawn by Monte Carlo simulation in this paper. The flow chart of the calculating and drawing program was given. Related Articles | Metrics | Comments（0） Cited: Baidu(1)

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EFFECT OF PHONON DISPERSION ON EXCITON GU SHIWEI Journal of Applied Sciences    1986, 4 (3): 226-230.   Abstract （409）      PDF（pc） （317KB）（65）       Knowledge map    Save In this paper, the dispersion of the longitudinal optical phonon is considered in a parabolic approximation. The effective Hamiltonian is derived by the use of a perturbation method. It is found that the more the phonon dispersion, the larger is the effective mass, and the smaller the screening radius of electron-hole effective interacting potential. Related Articles | Metrics | Comments（0） Cited: Baidu(2)

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PROJECTION TYPE MOIRE TOPOGRAPHY AND ITS APPLICATIONS ZHANG FUBAO Journal of Applied Sciences    1986, 4 (3): 231-236.   Abstract （385）      PDF（pc） （1216KB）（86）       Knowledge map    Save The contour lines are the best forms to describe the geometry of a three dimensional object. With the theory of modern optics, this paper derives the oomputed formula of the contour Moire fringes of a shape of a three dimensional object, i. e. Related Articles | Metrics | Comments（0）

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METHODS AND RESULTS OF MEASURING SURFACE HEAT LOSS OF STEAM PIPES WITH IR THERMOMETER ZHANG CAIGEN, WANG HONGXI, WU YINSHEN Journal of Applied Sciences    1986, 4 (3): 237-241.   Abstract （439）      PDF（pc） （330KB）（85）       Knowledge map    Save In this paper, we present a method and results of measuring the surface heat loss of steam pipes with IR thermometer. Data demonstrate that the measured results are in good agreement with that obtained using enthalpy potential method. Related Articles | Metrics | Comments（0）

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A FURTHER STUDY ON MULTIPLEXED SEQUENCRS CHEN LIDONG Journal of Applied Sciences    1986, 4 (3): 242-249.   Abstract （447）      PDF（pc） （457KB）（65）       Knowledge map    Save The paper investigates the pseudorandom properties of multiplexed sequences and gives the shift equivalent conditions of multiplexed sequences for fixed LSR1 and LSR2 tinder distinct injeotive maps γ and distinct choices of stages Aτ0, Aτ1, …,Aτk-1. Finally, the results of multiplexed sequences extended on GF (p) is given. Related Articles | Metrics | Comments（0）

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ON THE RELATIONSHIP BETWEEN THE EIGENVALUES OF TRIDIAGONAL MATRIX AND OF ITS SUBMATRICES MU DINGYI Journal of Applied Sciences    1986, 4 (3): 250-257.   Abstract （370）      PDF（pc） （435KB）（66）       Knowledge map    Save Suppose tridiagonal matrixthree problems will be considered in this paper: (1) Estimate the upper bound for dl (λ)=min|μi-λ|. Related Articles | Metrics | Comments（0）

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