1991 Vol.9

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GEOMETRIZATION NUMBER THEORY ELIMINATINGSINGULARITY APPROACH TO THE THEORYOF ELECTROMAGNETISM (I) The Theoretical Formulation of GNES Approach DAI XIANXI Journal of Applied Sciences    1991, 9 (1): 1-7.   Abstract （439）      PDF（pc） （447KB）（77）       Knowledge map    Save In order to realize highly accurate calculations for the theories of eleotromagnetism(e. g., microwave directive coupler et. al), the "geometrization number theory eliminating singularity approach" is suggested. This paper, the first one in the paper series, gives a general theoretical formulation of the GNES approach. And a fairly general class of exact, asymmetric, non-Hermitian, singular integral equation systems is formulated, with the aid of the Ω-series theory developed by us. The general formal solutions, the details of the GNES approach, techniques and numerical results will be presented in the succeeding papers. Related Articles | Metrics | Comments（0） Cited: Baidu(11)

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A CLASS OF MULTIPLEXED SEQUENCES CONTROLLED BY A CLOCK LI XIANGANG Journal of Applied Sciences    1991, 9 (1): 8-16.   Abstract （416）      PDF（pc） （550KB）（72）       Knowledge map    Save This paper is actually a note and a proof about the results in paper (1). At present, most of the clock-controlled sequences discussed by researchers are interleaving structures of some m-sequences which are shift-equivalent. Paper(1)tries to give a pseudo-random interleaving structure of some m-sequences which are not shift-equivalent. We call the sequences generated by it multiplexed sequences controlled by a clock and investigate their minimum polynomials under some simple conditions. Thus the complexities and periods of this class of sequences are found. Related Articles | Metrics | Comments（0）

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THE HEAT GENERATION FUNCTION ANDCONTROL EQUATION OF TEMPERATUREFIELD IN VISCOELASTIC MATERIAL C. OUYANG, Xu ZHENGYI Journal of Applied Sciences    1991, 9 (1): 17-23.   Abstract （539）      PDF（pc） （414KB）（78）       Knowledge map    Save For the homogeneous, linear, time-temperature equivalence viscoelastic material, the heat generation function and approximate control equation of the temperature field are derived from the basic laws of irreversible thermodynamics. The heat generation function is expressed as the simple function of loss modulus and strain amplitude for cyclic deformation. The arbitrary cyclic shape is approximated by Fourier series. The function and equation derived here are suitable for anisotropic, orthotropic and isotropic viscoelastic materials. They can be used to calculate the energy dissipation and temperature field of viscoelastic body, such as steel-cord tire, etc. Related Articles | Metrics | Comments（0） Cited: Baidu(4)

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SIMILARITY FOR LOSSY ELECTROMAGNETIC SYSTEMS SHI ZHENDONG Journal of Applied Sciences    1991, 9 (1): 24-28.   Abstract （344）      PDF（pc） （334KB）（76）       Knowledge map    Save Models of electromagnetic systems have been widely used for studies of wave radiation, scattering and transmission. The similarity between the model system and the full-scale system for the lossless electromagnetic system is well-known. In this paper, we introduce their similarity for lossy electromagnetic systems and discuss the similarity for bounded regions, which is useful to modeling measurements and scaling calculations before designing some electromagnetic systems. Related Articles | Metrics | Comments（0） Cited: Baidu(9)

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THE METHODS TO CONSTUCT THE ITERATIVE FUNCTIONS ZHANG HONGZHI Journal of Applied Sciences    1991, 9 (1): 29-42.   Abstract （621）      PDF（pc） （812KB）（91）       Knowledge map    Save In this paper we give the following results: 1. A point type of constructive theorem; 2. An interval type of constructive theorem; 3. A convergent type of constructive theorem; 4. An accelerative formula. They have the following characteristics:1. these methods are simpler and more convenient than the methods which had been given; 2. the iterative functions which are constructed to use the methods are always convergent; 3. the methods are the new parts of constructive theorems on the iterative function. Related Articles | Metrics | Comments（0） Cited: Baidu(1)

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ADHESION IMPROVEMENT INDUCED BY6MeV F IONS FOR THIN METAL FILMS ON TEFLON SUBSTRATES LIU ZHENGMIN, YANG YING Journal of Applied Sciences    1991, 9 (1): 43-48.   Abstract （420）      PDF（pc） （1305KB）（93）       Knowledge map    Save The enhanced adhesion of In, Sn, Al, Pd, Cu and Ni films on Teflon substrates under 6 MeV F ion irradiation was studied. The adhesion threshold doses for the films were measured using the Scotch tape test and found to be proportional to the ratio of the film material modulus of elasticity to the electronic stopping power. A possible mechanism of enhanced adhesion is presented based on our experiments. Thus some phenomena in the ion beam enhanced adhesion area, which have not been understood before, are explained, using this mechanism. Related Articles | Metrics | Comments（0）

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THE PREDICTION OF ELECTROMAGNETIC CHARACTERISTICS OF COATING TYPE WAVE-ABSORBING MATERIALS JIA BAOFU, LIU SHUZHANG, LIN WEIGAN Journal of Applied Sciences    1991, 9 (1): 49-54.   Abstract （582）      PDF（pc） （981KB）（133）       Knowledge map    Save Based on the formulas of effective permittivity and permeability of granular media derived from the strong fluctuation theory, the influence of the shapes of wave-absorbing particles was discussed. From the theory, the optimum shape of wave-absorbing particles was recommended and the prediction formulas of permittivity and permeability for ferrite wave-absorbing materials were given. It has been found that the experimental results are in good agreement with theoretic. The work would be helpful to the design of antiradar coating materials. Related Articles | Metrics | Comments（0） Cited: Baidu(3)

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DEVELOPMENT OF SMOKE SENSOR OF SINGLE-SOURCE AND DUAL-IONIZATION CHAMBERS BI QINGHUA, RONGQIAN Journal of Applied Sciences    1991, 9 (1): 55-60.   Abstract （479）      PDF（pc） （418KB）（134）       Knowledge map    Save This paper expounds the characteristics of the smoke sensor having single-source and dual-ionization chambers. It can be made very small, compact, highly sensitive and efficient for smoke detection. Measured data indicate that under the condition of 9 volts,we can obtain output signals over 1.5 volts as long as the rate of eliminating light is 0.5%/m. The signals are then processed by an amplifier and a control system composed of a CMOS medium-scale integrated circuit. Thus, a highsensitive smoke detector is formed. The smoke detector, when undergoing high and low temperature (+50~-20) tests for 96 hours under conditions of relative humidity in the 90~95% range, has not shown obvious variations in volt-ampere characteristics. The amplification and control systems are normal, with no misalarm phenomenon. The results demonstrate that the smoke sensor of single-source and dual-ionization chambers can be widely used for the prevention of fire and the detection of smoke contamination. Related Articles | Metrics | Comments（0） Cited: Baidu(3)

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THE INVESTIGATION OF ELECTRICAL CHARACTERISTICS OF Al-Ti/W-PtSi-Si SYSTEM LI SIYUAN, ZHANG TONGJUN, WANG XIAOGANG, JIA XIAOTIAN Journal of Applied Sciences    1991, 9 (1): 61-68.   Abstract （544）      PDF（pc） （1231KB）（62）       Knowledge map    Save In this paper, the electrical characteristics, especially the ohmic contact and electromigration properties of the Al-Ti/W-PtSi system were studied. The surface components, interface profile and the variation of surface morphology with the annealing treatment conditions of this system were observed by AES and SEM methods. The activation energy of the electromigration process was also presented. Surther, We investigated the application effects of the system Al-Ti/W-PtSi for SIT devices and 10, and got excellent effects. Finally, the action mechanism concerned with these effects were discussed. Related Articles | Metrics | Comments（0） Cited: Baidu(1)

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CALCULATION OF THE BASE DISPERSE RESISTANCE OF PHOTOTRANSISTOR FANG LONGSEN Journal of Applied Sciences    1991, 9 (1): 69-78.   Abstract （632）      PDF（pc） （634KB）（177）       Knowledge map    Save This paper first gives the calculating method that includes the analysis formula, that is, Router=RS·L·(LE2+2LEW-W2·Ln(LE/W))/(N·(W-LE))3 and Gummul numbers from SEDAN. Results show that the resistance relates to the area of the photo-excited region, the side length of the emitter region, the position of the emitter region, and the emitter current. We also find that the optimizing position of the emitter region in the square photo-excited region is in the center; and that the optimizing ratio of the side length of the photo-excited region W to the side length of the emitter region is 7.578425:1. These results will be used to design low noise, high frequency phototransistors. Related Articles | Metrics | Comments（0）

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A STUDY ON CURING PROPERTIES OF LIQUID TERPENE-MALEIC ANHYDRIDE ADDUCTS FOR EPOXY RESIN GAO NAN, JIN QILIANG, HUANG CHEN, SHEN JIANGHUA Journal of Applied Sciences    1991, 9 (1): 79-85.   Abstract （734）      PDF（pc） （419KB）（100）       Knowledge map    Save By using DSO and TGA, the curing properties of the novel liquid terpenemaleic anhydride (T-M) for epoxy resin are investigated by comparing with that of methyltetrahydrophthalic anhydride (MTHPA). The curing and the thermofis-sion mechanisms of T-M are discussed. It is found that T-M is storable and thermostable, and has slow and low liberation of heat in the curing process. Related Articles | Metrics | Comments（0） Cited: Baidu(4)

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EMPERATURE DEPENDENCE OF CYCLOTRON MASS OF AN ELECTRON IN A SEMICONDUCTOR QUANTUM WELL ZHAO XUNJIE, GU SHIWEI Journal of Applied Sciences    1991, 9 (1): 86-90.   Abstract （447）      PDF（pc） （316KB）（64）       Knowledge map    Save We have studied the temperature dependence of the electron self-energy for the Landau levels of n=0 and n=1, and the cyclotron mass of an electron in a semiconductor quantum well, the interactions between electron-Lo and electron-So phonons included. Related Articles | Metrics | Comments（0）

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THE EFFECTS OF THE IMPURITY COMPENSATION RATIO IN THE CRYSTALLINE SILICON ON THE VOLTAGE CHARACTERISTIC OF THE TRANSISTOR WITH HIGH POWER AND HIGH BREAKDOWN VOLTAGE Wu ZHONGCHI, QIAN YOUHUA, ZHANG WEIKUAN, Luo ZHENHUA Journal of Applied Sciences    1991, 9 (1): 91-94.   Abstract （406）      PDF（pc） （252KB）（75）       Knowledge map    Save Experimental results indicate that for the crystalline silicon substrates with basically the same resistivity the lowering of the impurity compensation ratio can effectively raise the breakdown voltage and the end product ratio of the transistor. The empiric formula, which expresses the dependence of the maximum breakdown voltage of the transistors made in a single N-Si wafer on the impurity compensation ratio, is obtained from the experiment. A preliminary analysis is also obtained here. Related Articles | Metrics | Comments（0）

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SIMILARITY OF NONLINEAR RLC CIRCUITS TO THE INTRINSIC OPTICAL BISTABLE SYSTEM LIU CUIHONG, WU TINGWAN, ZHANG XIAODONG, OU FA Journal of Applied Sciences    1991, 9 (2): 95-103.   Abstract （473）      PDF（pc） （572KB）（79）       Knowledge map    Save This paper reveals in dynamical equations the similarity of the nonlinear ELC circuits to the intrinsic optical bistable system (OBS) The bistability and the related transient behaviors of the RLC circuits of ferromagnetics are studied, through the imitative permeability function which is obtained by the least-square method according to some experimental data. Related Articles | Metrics | Comments（0）

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MÖSSBAUER SPECTROSCOPIC STUDIES OF THE OXIDATION OF IRON IMMERSED IN HYDROCHLORIC ACID AND ANTI-OXIDATION OF CORROSION INHIBITOR ZHOU SUNXUAN, ZHENG JIAXIN Journal of Applied Sciences    1991, 9 (2): 104-108.   Abstract （560）      PDF（pc） （348KB）（73）       Knowledge map    Save The oxides of iron immersed in hydrochloric acid and the antioxidation of the inhibitor have been studied by the Conversion Electron Mössbauer Spectroscopy (OEMS). The oxides of iron immersed in hydrochloric acid are β-FeOOH and γ-FeOOH, the latter being the dominant composition. The inhibitor in hydrochloric acid slows down the oxidation progress of iron immersed in hydrochloric acid. Furthermore, the better the inhibition ability of the inhibitor for iron in bydrochloric acid, the slower the oxidation progress of iron in the air. At the end of this paper, the anti-oxidation mechanism of the inhibitor is discussed. Related Articles | Metrics | Comments（0）

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STUDIES ON THE BLENDING OF POLYCARBONATE WITH STYRENE-MALEIC ANHYDRIDE COPOLYMER YE JINYONG, LUO HUIZIONG Journal of Applied Sciences    1991, 9 (2): 109-116.   Abstract （634）      PDF（pc） （3089KB）（185）       Knowledge map    Save The compatibility of polycarbonate (PC) with styrene-maleic anhydride copolymer (SMa) varies according to the Ma content of SMa, good compatibility being achieved when the Ma content of SMa is about 26-28 mole%. Results from DSC, FTIR, 13C-NMR and SEM studies indicate a graft copolymerization takes p]aoe between PC and SMa during the process of melt blending. Related Articles | Metrics | Comments（0） Cited: Baidu(16)

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INVESTIGATION OF ALUMINIUM NITRIDE THIN FILMTRANSDUCERS LIUFU De, LIANG ZINAN Journal of Applied Sciences    1991, 9 (2): 117-122.   Abstract （415）      PDF（pc） （432KB）（84）       Knowledge map    Save A one-dimension longitudinal model microwave transducer made with high quality piezoele otric aluminium nitride thin films is reported in this paper. These films are deposited by d. o. planar magnetron sputtering on a z-LiNbO3 propagation medium. With these films, a microwave bulk acoustic wave delay line is fabricated which has a time delay of 1.83 μs, insertion loss of 22 dB, and bandwidth (3 dB) of 13% under the central frequency of 2.21 GHz. For such piezoelectric films used in the microwave frequency, the electromechanical coupling coefficient (kt) of 0.13 is obtained by the comparison of theoretical input admittance values of the transducer with the measured values. This kt is smaller than that of the bulk material which may be mainly caused by the derivation and inversion of c-axis orientation in crystallites. The experimental results also show that there is an equivalent series resistance in the, transducer that may illustrate why the tuned and matched transducer has losses. Related Articles | Metrics | Comments（0） Cited: Baidu(3)

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SUPERLOW-PASS FILTER FREQUENCY RESPONSE TEST BY MICROCOMPUTER XU CHENGTANG Journal of Applied Sciences    1991, 9 (2): 123-128.   Abstract （437）      PDF（pc） （393KB）（92）       Knowledge map    Save This paper introduces how to best the frequency response of a superlow-pass filter by a microcomputer. The customary signal exciting the filter is a slowly swept sine. Due to the development of digital signal processing algorithms and especially the efficient implementation of the discrete Fourier transform (DFT) with the fast Fourier transform (FFT), it becomes possible to use more complex input signals. Instead of exciting the filter under test frequency by frequency, it is possible to generate arbitrary waveform with a broadband spectrum, using a digital-to-analog (D/A) converter, to gather all the spectral information in one measurement. In many applications, the prescribed spectral shape is a flab spectrum. One waveform that has such a flat spectrum is a sharp impulse, but in this case all the power is concentrated at one point in time, leading to a maximum peak power. This results in an important reduction of the measurement time, bub also in an undesired accuracy loss of the measurement results if no spacial precautions were taken. According to Schroeder's method a waveform that is the sum of a number of harmonically related cosine waves with equal amplitudes and with modulated phases for reducing the peak-factor has been generated. The data file, which is discretely calculated by the microcomputer according to one period of the waveform, has been created. While the filter is tested, the data file will be read into the memory of the microcomputer. By interrupting the CPU of the microcomputer at regular intervals, the waveform is sent to the filter through the digital-to-analog converter.At the same time, the output of the filter is collected by the microcomputer through an analog-to-digital converter. The frequency response of the filter can be obtained by FFT for the output. Thus the test can be performed in a shorter time with better accuracy. Related Articles | Metrics | Comments（0）

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ENERGY BAND STRUCTURES OF CsC8 Guo JIANQING, Lu DONG Journal of Applied Sciences    1991, 9 (2): 129-134.   Abstract （521）      PDF（pc） （404KB）（55）       Knowledge map    Save The band structures of cesium graphite intercalation compound CsC8 is calculated with the method put forward by Ohno, Nakao and Kamimura. The band bottom of 6S electrons of cesium lies 3.6eV above the Fermi level. Hence all the valence electrons of the cesium atom layer transfer to the antibonding π band of graphite carbon layers. The obtained band structure is in good agreement with that of other calculations. Related Articles | Metrics | Comments（0）

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THE PHONON DISPERSION CURVES OF DIAMOND, Si, Ge and α-Sn Zi JIAN, ZHANG KAIMING Journal of Applied Sciences    1991, 9 (2): 135-139.   Abstract （1365）      PDF（pc） （293KB）（551）       Knowledge map    Save The phonon dispersion curves of diamond, Si, Ge and α-Sn are calculated using the six-parameter Born-von Karman model. Except for the TA modes of Si, Ge and αSn, the calculated results are in good agreement with the experimental data. Related Articles | Metrics | Comments（0）

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A REAL TIME STATISTICAL ANALYSIS METHODOLOGY AND APPLICATION FOR INTEGRATED CIRCUIT PROCESS He YIE Journal of Applied Sciences    1991, 9 (2): 140-144.   Abstract （474）      PDF（pc） （312KB）（89）       Knowledge map    Save A real time statistical analysis methodology of IC manufacturing process in combination with an experimental design is presented. The modelling analysis results of the real CMOS and NMOS IC indi cate that the most possible process step which is responsible for the unusual device or circuit performance stribution can be found using the methodology to analyze the measurementl diresults obtained from chips in the process line. Related Articles | Metrics | Comments（0） Cited: Baidu(1)

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FINITE DIFFERENCE METHODS FOR ENHANCED OIL RECOVERY SIMULATION OF CHEMICAL FLOODING YUAN YIRANG, WANG WBNQIA Journal of Applied Sciences    1991, 9 (2): 145-153.   Abstract （405）      PDF（pc） （538KB）（67）       Knowledge map    Save A two-dimensional, multiphase, compressible, compositional reservoir simulator has been developed, and applied to micellar/polymer flooding. The mathematical model for the two-dimensional enhanced oil recovery simulation can be described by a system of nonlinear partial differential equations. We put forward a class of finite difference scheme. The estimates obtained are the best possible. Related Articles | Metrics | Comments（0）

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CALCULATION OF BEST AFFINE APPROXIMATIONS OF SYMMETRIC FUNCTIONS Wu CHUANKuN Journal of Applied Sciences    1991, 9 (2): 154-160.   Abstract （579）      PDF（pc） （424KB）（80）       Knowledge map    Save This paper presents an efficient algorithm for calculating the best affine approximations of symmetric functions by using spectral techniques. Related Articles | Metrics | Comments（0）

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A CLASS OF INVERSE PROBLEMS OF ORDINARY DIFFERENTIAL EQUATION IN MECHANICS WU XlNYUAN Journal of Applied Sciences    1991, 9 (2): 161-168.   Abstract （626）      PDF（pc） （462KB）（120）       Knowledge map    Save This paper puts forward a class of inverse problems of ordinary differential equations in mechanics, and gives a numerical method for dealing with them. Related Articles | Metrics | Comments（0）

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BOOLEAN METHOD FOR SOLVING DECI SION PROCESSES LIU YONGCAI Journal of Applied Sciences    1991, 9 (2): 169-176.   Abstract （461）      PDF（pc） （477KB）（77）       Knowledge map    Save In the enormous number of decision processes of scientific experiments, engineering tests, medical diagnoses, environment monitoring, etc., we usually meet, such problems:how can the objective laws be deduced from the limited number of trials and how onn the inherent cause-effect relationships be revealed? In this paper, a Boolean method for solving such problems is given. Related Articles | Metrics | Comments（0）

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DECOMPOSITION OF RECOGNIZABLE STRONG CODES QIU WEIDE, ZHANG LING Journal of Applied Sciences    1991, 9 (2): 177-181.   Abstract （454）      PDF（pc） （363KB）（64）       Knowledge map    Save In this paper we give the following results:(1)Every group is a syntactic monoid of language X* with X being a maximal strong code; (2) Recognizable strong code X can decompose into two recognizable strong codes iff there is a proper congruence in the minimal automaton recongnizing X*; (3)the maximal strong code, whose syntactic monoid is a simple group, is called a simple maximal strong code. Any recognizable strong code can decompose into a finite number of simple recognizable strong codes. Related Articles | Metrics | Comments（0） Cited: Baidu(5)

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GROWTH AND OPTICAL PROPERTIES OF SCINTILLATION CRYSTAL CdWO4 Xu JUN, MA XIAOSHAN, Wu GUANGZHAO, SHEN YAFANG, ZHANG XINMIN, Gu JI Journal of Applied Sciences    1991, 9 (2): 182-184.   Abstract （557）      PDF（pc） （991KB）（94）       Knowledge map    Save Large size crystal CdWO4 has been successfully grown with the CZ method heated by a high-frequency inducing generator. We find that the oxygen vacancy and Fe3+ impurities are the main reasons for crystal colouration. The luminescence spectra of crystal CdWO4 have also been measured. Related Articles | Metrics | Comments（0）

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X-RAY DIFFRACTOMETRY OF THE STRUCTURE OF InxGa1-xAs/GaAs SUPERLATTICE CHONG FUMIN, CHEN JINGYI Journal of Applied Sciences    1991, 9 (2): 185-188.   Abstract （465）      PDF（pc） （251KB）（119）       Knowledge map    Save A conventional X-ray diffractometer is used to analyse the structure of InxGa1-x As/GaAs superlattice. Kinematical approximation is employed in the analysis. The results are similar to those got by double-crystal diffractometry The differences between the two methods are also discussed. Related Articles | Metrics | Comments（0）

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DIRECTION OF ENERGY FLOW OF MAGNETOSTATIC SURFACE AND VOLUME WAVES IN FERRIMAGNETIC FILM WANG QI, BAo JIASHAN Journal of Applied Sciences    1991, 9 (3): 189-195.   Abstract （474）      PDF（pc） （449KB）（130）       Knowledge map    Save The magnetostatio surface and volume waves are dispersive in ferrimagnetio film wave guide and exhibit wave vector anisotropy go that, in general,the energy flow and wave veotor are noncollinear. Theoretical investigation is made in this paper of variations of the direction of energy flow of magnetostatio surface and volume waves with the changes of the direction of the biasing magnetic field. Related Articles | Metrics | Comments（0） Cited: Baidu(1)

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A RECURSIVE ALGORITHM FOR GENERATING CURVES YANG ZHENGroNG, YAO LINGSHENG, GAN JUNREN Journal of Applied Sciences    1991, 9 (3): 196-200.   Abstract （509）      PDF（pc） （289KB）（84）       Knowledge map    Save A recursive algorithm for generating curves is presented here This algorithm is simple and easy to implement. It is a part of the GDL system, which is a Found and optic device's graph processing system developed by us, and has been verified with the running of the system. Related Articles | Metrics | Comments（0）

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GEOMETRIZATION NUMBER THEORY ELIMINATING SINGULARITY APPROACH IN THE THEORY OF ELECTROMAGNETISM(Ⅱ) Reduced Charge Distribution, General Formal Solution and Number Theory Eliminating Singularity Theorem DAI XIANXI, XU XINWEN, LI HONGFANG, ZHONG WANGHEN, HUANG JINGYI Journal of Applied Sciences    1991, 9 (3): 201-208.   Abstract （642）      PDF（pc） （459KB）（94）       Knowledge map    Save This paper is the second one of the paper series on GNES approach. In this paper the concept of reduced charge distribution is suggested and its applications are discussed. The formal solutions of the general basic integral equation systems are given, which express the coefficients of capacity by the geometric parameters of the device directly. The number theory eliminating singularity theorem is also given. It provides a scheme, which simultaneously applies the number theory and naturally cancels the diagonal singularities of the integral kernels without introducing any adjustable parameters. Related Articles | Metrics | Comments（0）

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ON THE OSCILLATION CONDITION OF SECOND ORDER SYSTEM ZHANG CHANGBO Journal of Applied Sciences    1991, 9 (3): 209-214.   Abstract （638）      PDF（pc） （355KB）（76）       Knowledge map    Save This paper will give conditions of second order system oscillation. We will make a farther study on the conditions of the oscillation of the non-linear system (3) having deviation variable on the basis of that of system (2) which improves some of the results having published at home and abroad. Related Articles | Metrics | Comments（0）

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ARC CURRENT CONTROL SYSTEM OF ION SOURCE BASED ON SINGLE CHIP MICROCOMPUTER ZHAI QIGANG, YU GUANGYI, XU LINMU, CHEN WEIMING Journal of Applied Sciences    1991, 9 (3): 215-221.   Abstract （569）      PDF（pc） （503KB）（83）       Knowledge map    Save A control system of arc current of ION source has been designed and constructde by using a single chip microcomputer. This system transmits the information of the ION source by optical fibers from the very high voltage side to the ground voltage side. By optical communication, the part of the control system located on the ground voltage side is insulated from the very high voltage. This control system can be used to control the arc current of two different types of ION sources:the direct heating ION source and indirect heating ION source. The stability of the arc current of the ION source using this control system is less than ±1% (F. S.). Related Articles | Metrics | Comments（0）

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SCATTERING OF ELASTIC WAVE (SH) BY PERIODICALLY ARRAYED CRACKS AT THE INTERFACE OF TWO BONDED DISSIMILAR ELASTIC HALF-SPACES ZOU ZHENZHU, ZHANG ZIMAO, MA XINGRUI Journal of Applied Sciences    1991, 9 (3): 222-232.   Abstract （430）      PDF（pc） （669KB）（85）       Knowledge map    Save Recently the scattering of elastic waves by a single crack has been studied in considerable detail. In this paper, the interaction of elastic waves (SH) with periodically arrayed cracks at the interface of two bonded dissimilar elastic half-spaces is considered. Using the Finite Fourier Transform technique, the solution of the mixed boundary value problem for a typical strip is reduced to a first kind of singular integral equation with a singular kernel of ctg π/(2l)(u-x), where l is the width of the periodical strip. By means of the Chebyshev polynomial, the numerical calculation of the integral equation is concluded. And finally, the variation of the stress intensity factor at the crack rim and the magnitude of scattering displacement at the far-field with the frequencies of the incident wave have been given numerically. Related Articles | Metrics | Comments（0） Cited: Baidu(2)

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MULTIPLE-CRITERION OPTIMIZATION FOR CMOS INVERTER CHAIN WITH YIELD MAXIMIZATION HAO YUE Journal of Applied Sciences    1991, 9 (3): 233-242.   Abstract （473）      PDF（pc） （597KB）（107）       Knowledge map    Save In this paper, the mathematical model of the CMOS inverter chain for multiple-criterion optimization and the procedure of building objective functions are given. An algorithm of asynchronous statistical optimization is suggested in which objective functions of yield and others are optimized with different steps. The analytic descriptions of calculating the circuit yield can be obtained. At last, an example of the CMOS design with multiple objectives is given with numerical analysis, and the feasibility of the algorithm is demonstrated based on the simulation results. Related Articles | Metrics | Comments（0） Cited: Baidu(1)

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THE FIELD DISTRIBUTION OF MAGNETIC HEAD-MEDIUM SYSTEM CHEN JIANYONG, XU SHUJUN Journal of Applied Sciences    1991, 9 (3): 243-250.   Abstract （385）      PDF（pc） （466KB）（89）       Knowledge map    Save In this paper, a computer simulation using FEM is described for the head-medium system of numerical magnetic recording. The field and the vector magnetization distributions of the model which takes the head and the medium as one body are given. The vector magnetic hysteresis model is used as the magnetization process of the medium and the measured values of the head material are used as the head's hysteresis model. Related Articles | Metrics | Comments（0）

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DESIGN AND FABRICATION OF DISPERSION-FLAT QUADRUPLE-CLAD FIBERS XIAO TIANPENG, CHEN XIHAO Journal of Applied Sciences    1991, 9 (3): 251-257.   Abstract （402）      PDF（pc） （466KB）（103）       Knowledge map    Save Dispersion-flat fibers are very attractive for long distance high-bit optical fiber communication systems. This paper discusses the theory of the quadruple-clad single-mode fibers, and describes their design and performance. The initial experimental results, concerning a fiber with low dispersion over the 1.3μm -1.55μm wavelength interval are presented. Related Articles | Metrics | Comments（0）

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NEW MATERIAL FOR VLSI-FORMATION OF WSi2 BY RAPID THERMAL ANNEALING CHEN cUNLI, cAO MINGSHU, HUA WENYU Journal of Applied Sciences    1991, 9 (3): 258-262.   Abstract （513）      PDF（pc） （1098KB）（161）       Knowledge map    Save In this paper, the behaviors of WSi2 formed from cosputtering W-Si film after rapid thermal annealing in vacuum for 15 sec. are investigated by Raman scattering, SEM, XRD, AES and resistivity measurements. There are two characteristic Raman peaks of WSi2 at 331 and 450cm-1. Crystallization of WSi2 increases with the increase in temperature of rapid thermal annealing. It is found that a W5Si3 phase exists in WSi2, but its behavior is still WSi2 character. Related Articles | Metrics | Comments（0）

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THE SEGREGATION OF METAL IMPURITIES IN SILICON AND ITS APPLICATION TO DEVICE TECHNIQUE ZHENG GUOXIANG, ZHOU SHOUTONG, WU JIANGEN, WANG cHANGPING, QU FENGYUAN, DING ZHIFA Journal of Applied Sciences    1991, 9 (3): 263-268.   Abstract （619）      PDF（pc） （437KB）（116）       Knowledge map    Save Heavy metal gettering in silicon devices has been investigated. The mechanisms of phosphorus diffusion gettering are generally attributed to induced dislocations or phosphide. It is shown in this work that the final annealing at low temperature is able to produce gettering action. The new gettering mechanism with segregation annealing is also discussed here. The segregation coefficients between phosphorus doped silicon and intrinsic silicon Suggest that the segregation bemperature must be as low as possible, but compatible with gold mobility. The segregation annealing technique can be used to obtain a dark current of less than 10pA/mm2 in making photoelectric detectors. The general applicability of the technique is also described. Related Articles | Metrics | Comments（0） Cited: Baidu(1)

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A STUDY ON THE LEANED BURR FORMATION IN METAL CUTTING WANG GUICHENG, KAZUO NAKAYAMA, MINORU ARAI Journal of Applied Sciences    1991, 9 (3): 269-275.   Abstract （572）      PDF（pc） （1269KB）（127）       Knowledge map    Save On the basis of the process of metal cutting, a model for the leaned burr formation in metal cutting is made. Then the principle of forming the leaned burrs is studied, and the related theories are analyzed, thus a clear understanding of the forming process and the influencing factors of the burrs is obtained. Furthermore, a certain number of measures to prevent the burrs are advanced in order to control and decrease the formation of the machining burrs, guarantee and improve cutting quality, and develop new methods to restrain the machining burrs. Related Articles | Metrics | Comments（0） Cited: Baidu(17)

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