1985 Vol.3

Please wait a minute...


For Selected: Download Citations EndNote Ris BibTeX Toggle Thumbnails

Select

FINITE DEFORMATION ANALYSIS FOR STRESS CONCENTRATION AROUND A FREE NOTCH AND STRESS SINGULARITY AROUND A DEEP NOTCH OUYANG CHANG, TANG GUOAN Journal of Applied Sciences    1985, 3 (1): 1-5.   Abstract （366）      PDF（pc） （310KB）（75）       Knowledge map    Save The expressions of stresses in finite deformation of an elliptic or parabolic notch in infinite elastic plane has been obtained by incremental analysis. Such expressions are functions of loads, notch shape and material behavior. The stress singularity for a deep notch has especially been discussed, and it is found that this singularity could be related with the stress intensity factor in linear fracture mechanics, but the order of this singularity has been changed from 1/√ρ to α ln 1/√ρ, ρ being the curvature radiu of the notch root, α a material constant. The new result here explains the difference between the cases of plane strain and plane stress. Related Articles | Metrics | Comments（0）

Select

GROUND-STATE ENERGY OF A STRONG-COUPLING EXCITON IN PIEZOELECTRIC CRYSTAL GU SHIWEI, ZHOU YUKUI Journal of Applied Sciences    1985, 3 (1): 6-12.   Abstract （397）      PDF（pc） （412KB）（69）       Knowledge map    Save In this paper, some properties of a strong-coupling exciton in piezoelectric crystal are studied. An effective Hamiltanian of the exciton is obtained by the method of a linear-combination operator and a simple unitary transformation. The self-energy could be written as a series in α-1, the first term being proportional to α, the coupling constant. The interaction potential induced by the interaction of the electron-hole with the phonons is related to coupling constant and sound speed etc. Related Articles | Metrics | Comments（0） Cited: Baidu(2)

Select

AGING OF PIEZOELECTRIC CERAMIC PARAMETERS AND DETERIORATION OF TRANSDUCER PERFORMANCES HUANG DANNI, WANG ZHICHAO, SHOD XINMIN, ZHENG ZHONGYOU, WANG HONG Journal of Applied Sciences    1985, 3 (1): 13-19.   Abstract （1265）      PDF（pc） （1185KB）（241）       Knowledge map    Save The variations of parameters of piezoelectric ceramics Fe1.5 and corresponding high power transmitting transducers with the logarithm of time have been examined separately with normal specimens and a certain type of vibrator under defined temperatures (room temperatures, 60℃ and 100℃), pressure (30 kg/cm2) and electrical power densities (0.3W/cm3·KC and 0.5W/cm3·KC) in this paper. Experimental results show that the causes of aging of ε33T and kp are not all the same. The varying tendency of the properties of ceramic elements after the cumulative action of the electrical power density of 0.3W/KC·cm3 is different from that of the normal specimens under each single condition. Both the value of kp and ε33T are some what increased. It was considered that this aging behaviour was related to the internal bias electrical field of the ceramic material selves. We would conclude that the aging of properties of piezoceramics under the given temperature, pressure and electrical power density is not serious enough to cause the deterioration of performances of transducer. The appropriate heat treatment will be favourable to stabilizing the performances of ceramic materials and transducers. Related Articles | Metrics | Comments（0）

Select

MICROSCOPIC QUANTUM THEORY OF THE OPTICAL WAVEGUIDE SUN HONG, PENG QIANJUEN, FANG JUNXIN Journal of Applied Sciences    1985, 3 (1): 20-28.   Abstract （389）      PDF（pc） （589KB）（121）       Knowledge map    Save The present article takes the Frenkel exciton in a crystalline planar waveguide as a model to set up a microscopic quantum theory of the optical waveguide. Related Articles | Metrics | Comments（0） Cited: Baidu(6)

Select

A NEW METHOD FOR MEASURING THE BIREFRINGENCE OF SINGLE-MODE FIBERS WITH SHORT BEAT-LENGTH OR NONUNIFORMITY HUANG SHANGYUAN, LIN ZONGQJ Journal of Applied Sciences    1985, 3 (1): 29-37.   Abstract （346）      PDF（pc） （559KB）（57）       Knowledge map    Save A birefringence formula of single-mode optical fiber in terms of the positions of the highest peak and its adjacent valley on the curve of the measured polarization ellipticity via the fiber twist is proposed and the distortion of the measured curves for the fibers with nonuniform birefringence is discussed. The new measuring process which is based on null measurement is simple and reliable. Related Articles | Metrics | Comments（0）

Select

SOME CHARACTERISTICS OF Si-DOPED GaAs BULK CRYSTALS MO PEIGEN Journal of Applied Sciences    1985, 3 (1): 38-45.   Abstract （593）      PDF（pc） （583KB）（175）       Knowledge map    Save In this paper, a study has been made of the compensation ratio (θ), the minority carrier diffusion length (Lp) and the dislocation density of Si-doped GaAs crystals grown by the horizontal Bridgman method. The study on compensation ratio shows that tie donor can be self-compensated through a defect equilibrium due to the formation of the SiGaVGa complex, when the carrier concentration is greater than 1017cm-3. Some relationships between Lp, dislocation density and θhave been found. The Lp decreases with the θ increasing and changes abruptly at around θ=0.3, while the θ found for dislocation-free and low dislocated crystals is greater than 0.38 with the carrier concentration in the range of 1~2×1018cm-3. It may be suggested that the Lp and dislocation density are related to SiGaVGa in some way, which is formed through the interaction between SiGa and VGa, and with VGa created in turn from Si and O, by the removal of Si from Ga sites. In general, the θ could be used as a satisfactory guide to the quality of Si-doped GaAs crystals. Related Articles | Metrics | Comments（0） Cited: Baidu(1)

Select

THE PHOTOELECTROCHEMICAL PROPERTIES OF LIQUID JUNCTION SOLAR CELLS COMPOSED OF N-CdTe FILM ELECTRODES DENG XUNNAN, PANG RENDE, GAN SHAOXIN Journal of Applied Sciences    1985, 3 (1): 46-51.   Abstract （271）      PDF（pc） （412KB）（108）       Knowledge map    Save The elementary photoelectrochemical properties of liquid junction solar cells composed of N-CdTe film electrotrodes are reported in this paper. The cell could be represented as N-CdTe/1M Na2S, 1M S. 1M NaOH/C The electrode potential-current curves, voltage-current curves of the cells have been measured. The relationship between the irradiation intensity and the photovoltage, photocurrent and conversion efficiency have been determined. Under the irradiation of 60mW/cm2, the energy conversion efficiency is 1~2%. The band gap of the electrode is 1.43eV. The flatband potential of -1.1~-1.2V (VS·SCE)is determined by the measurement of the differential capacitance and the maximum open-circuit photopotential. Furthermore, the influence of the counter electrodes and electrolytes on the conversion efficiency have been tested. Related Articles | Metrics | Comments（0）

Select

DETERMINATION OF DEEP LEVER CENTERS ON GaAs MESFET BY CONDUCTANCE DLTS SHENG CHI, ZHAN QIANBAO Journal of Applied Sciences    1985, 3 (1): 52-56.   Abstract （315）      PDF（pc） （242KB）（73）       Knowledge map    Save A conductance DLTS is developed to detect traps in epitaxial grown and ion-implanted GaAs MESFETS. The trap of EV+0.91eV which is generally regarded as Cr level and the trap of EV+0.52eV exist in both devices. Besides, a level of EV 4-0.71eV exists only in ion-implanted devices with large noise. A large and wide energy band at EV+0.2~EV+0.5eV is attributed to interface state which exists only in epitaxial large-noise FET and degraded devices. The trap in ion-implanted GaAs FET can be decreased to a level of the best-quality epitaxial FET. Related Articles | Metrics | Comments（0）

Select

ANALYSIS OF WEIGHTED FILTERING ZHANG RONGXIN Journal of Applied Sciences    1985, 3 (1): 57-64.   Abstract （322）      PDF（pc） （513KB）（60）       Knowledge map    Save In this paper, different fading memory filters have been discussed and a new technique to get weighted Sequences is given by using weight function sequence. This makes it possible to choose weight sequence according to majorization of some result functions. Related Articles | Metrics | Comments（0） Cited: Baidu(1)

Select

AN IMPROVED PROGRAM USED FOR SEARCHING AND MATCHING OF X-RAY POWDER DIFFRACTION PATTERNS LIN TEINHUI, ZHANG SAIZHU, CHEN LIJUN, CAIXINXING Journal of Applied Sciences    1985, 3 (1): 65-73.   Abstract （290）      PDF（pc） （666KB）（67）       Knowledge map    Save A program used for searching and matching of X-ray powder diffraction patterns was written and a library for this purpose was built by using FORTRAN-IV language. The program has been tested by using it to sdarch tens of patterns. Generally, all the existing phases can be searched out and the number of missearchings is not so large. In comparison with other programs, briefly, two major improvements have been made in the present program:(1) a so-called 'substance-type-discrimination' was introduced into the searching process which can reduce missearching remarkably; (2) a new method for quantitative intensity-matching was proposed, based on the least square method. It can give better results than the Frevel's method and provide more information to discriminate the canditates further. Related Articles | Metrics | Comments（0） Cited: Baidu(2)

Select

SYNTHESIS OF POLYSULFONE-(OR POLYETHERSULFONE) EPOXY RESINBLOCK COPOLYMERS DIKG YOUJUN, LEI YUQING, WANG XINRONG Journal of Applied Sciences    1985, 3 (1): 74-81.   Abstract （374）      PDF（pc） （490KB）（85）       Knowledge map    Save Polysulfone (or Polyethersulfone)-epoxy resin was synthesized by the interaction of dihydroxyl-terminated polysulfone (or polyethersnlfone) oligomers with epoxy resin. The block copolymers have excellent adhesive properties with metals such as Al, Cu and Pe at high temperature (150℃). Related Articles | Metrics | Comments（0） Cited: Baidu(1)

Select

FOCUSING METHOD FOR NONDESTRUCTIVE MEASUREMENT OF OPTICAL FIBER AND PREFORM INDEX PROFILE XU KUODA, ZHANG ZHAONAN, HOU YUANGQINQ Journal of Applied Sciences    1985, 3 (1): 82-87.   Abstract （374）      PDF（pc） （1053KB）（108）       Knowledge map    Save The focusing method is a nondestructive one for obtaining the refractive-index profile of fibers and preforms of different sizes. An uniform incoherent collimated light beam is passed transversely through the fiber or preform immersed in an index matching oil and the light intensity distribution is directly detected by a CdS photo conductive detector, or recorded on an X-Y recorder with the aid of silicon vidicon camera and sampling line oscilloscope. The refractive-index profile is finally computed by means of a microcomputer. This paper relates briefly the principle of the method and experimental details and also gives the quantitative results and conclusions. Related Articles | Metrics | Comments（0）

Select

DISPERSION MEASUREMENT IN SINGLE-MODE FIBERS HUANG ZHAOMING, YAO SHOUQUAN, ZHANG GUFAN Journal of Applied Sciences    1985, 3 (1): 88-91.   Abstract （437）      PDF（pc） （1827KB）（63）       Knowledge map    Save We have measured dispersion of single-mode fibers by means of time domain and frequency domain methods at 0.82μm. Since single-mode fibers designed for longer wavelengths have 2 or 3 modes at this wavelength, it is necessary to separate ntermodal dispersion from singlemode dispersion. The two methods gave the same iresult. Related Articles | Metrics | Comments（0）

Select

THE APPLICATION OF THE BOUNDARY ELEMENT METHOD TO SOLVING FREE BOUNDARY PROBLEMS ZHENG JIADONG Journal of Applied Sciences    1985, 3 (1): 92-94.   Abstract （417）      PDF（pc） （170KB）（85）       Knowledge map    Save In this paper the free boundary problems are solved with boundary element method. The practical free surface of.seepage flow of an earth dam is calculated successfully. Related Articles | Metrics | Comments（0）

Select

SUPER MODE CONCEPT AND APPLICATION HUANG HUNG-CHIA Journal of Applied Sciences    1985, 3 (2): 95-99.   Abstract （566）      PDF（pc） （311KB）（142）       Knowledge map    Save Analytic study of optical waveguide characteristics may be much facilitated by a judicious choice of the types of modes (ideal modes, local modes, super modes) for field expansion. The present note will provide examples to illustrate this viewpoint, which seems not to have received sufficient attention. Related Articles | Metrics | Comments（0）

Select

QUANTUM ELECTRODYNAMICAL MODEL THEORY OF PLANAR WAVEGUIDE SYSTEM——NON-SPATIAL DISPERSION CASE ZHENG HANG, FANG JUNXIN Journal of Applied Sciences    1985, 3 (2): 100-107.   Abstract （340）      PDF（pc） （507KB）（119）       Knowledge map    Save A reasonable quantum electrodynamical model is introduced in the present article for the interacting system of a planar waveguide and the electromagnetic field. The response to external electromagnetic perturbations of this interacting system is discussed using the linear response theory, and is proved to be fully determined by the physical properties of the intrinsic elementary excitations guided-wave polaritons of the system. The theory is useful for discussions of propagation, transmission, reflection, scattering and absorption of electromagnetic waves as well as the propagation of external electric-, magnetic-or acoustic-perturbations in the planar waveguide. Related Articles | Metrics | Comments（0）

Select

CLOSED-LOOP OPTIMAL SOLUTION TO QUADRATIC BOUNDARY CONTROL OF HYPERBOLIC SYSTEMS YOU YUNCHENG Journal of Applied Sciences    1985, 3 (2): 108-113.   Abstract （296）      PDF（pc） （342KB）（70）       Knowledge map    Save In this paper, closed-loop synthesis to an optimal problem with respect to quadratic criterion is proved for mild solution of hyperbolic boundary control systems of Dirichlet, Neumann or mixed type. Feedback operators are characterized by solution of linear Fredholm operator integral equations. Related Articles | Metrics | Comments（0） Cited: Baidu(2)

Select

ON AUTOMATIC DIVIDING OF CHINESE WORDS WANG YUNGCHENG Journal of Applied Sciences    1985, 3 (2): 114-119.   Abstract （422）      PDF（pc） （429KB）（75）       Knowledge map    Save The present paper summarizes several well-known methods for autodividing Chinese words, and at the same time proposes a new method, which has been proved in practice to be both feasible and simple. Related Articles | Metrics | Comments（0） Cited: Baidu(1)

Select

SOLVING THREE CLASSES OF RECURRENCE EQUATIONS ZHU HONG, DUAN ZHENHUA, AN JIAPENG Journal of Applied Sciences    1985, 3 (2): 120-127.   Abstract （366）      PDF（pc） （408KB）（59）       Knowledge map    Save In this paper, we analyse three classes of recurrence equations by, means of harmonic series, binary trees and Pascal configuration. We get general expressions of their solutions. These recurrence equations and their solutions are useful for us to research in computer science. Related Articles | Metrics | Comments（0） Cited: Baidu(1)

Select

THE MODIFICATION OF BEAM DEFLECTIVE METHOD FOR MEASURING REFRACTIVE INDEX PROFILE OF A FIBER PREFORM LIAO YKNBIAO, TIAN QIAN, WU GENGSHENG Journal of Applied Sciences    1985, 3 (2): 128-132.   Abstract （361）      PDF（pc） （276KB）（68）       Knowledge map    Save In this paper, a modificatory beam deflective method, a method for nondestructive measurement of refractive index profile of a fiber preform, is described. Near matching fluid instead of accurate matching fluid is used in this method, the diameter of incident beam used being reduced at the same time. The experiments show that the measurement results are reliable. The measuring time can be saved and the accuracy promoted. Related Articles | Metrics | Comments（0）

Select

THE REVISION ABOUT THE LINEWIDTH FORMULA OF LASER YAN ZUQI Journal of Applied Sciences    1985, 3 (2): 133-136.   Abstract （374）      PDF（pc） （286KB）（46）       Knowledge map    Save In the literature[1], the calculating methods about the storage energy, the net power loss of coherent light in the cavity and the linewidth of laser light in accordance with such laser in which the distribution of light intensity was transverse nonuniform had been discussed. In this paper, the discussion is extended to the general laser in which the transverse and the longitudinal distribution of light intensity are all nonuniform, and the linewidth formula of laser light, which has been shown by Townes, Maitland, is revised. And the relative revised value resulted from the nonuniform distribution of light intensity is estimated with a cylindric laser of single mode. Related Articles | Metrics | Comments（0）

Select

FERROMAGNETIC RESONANCE IN ARBITRARY ORIENTED PLANE OF CUBIC CRYSTAL HE YUQUAN Journal of Applied Sciences    1985, 3 (2): 137-142.   Abstract （490）      PDF（pc） （390KB）（100）       Knowledge map    Save The ferromagnetic resonance (FMR) relations in magnetically anisotropic single-crystal ferrites with cubic symmetry have been reexamined. Detailed analyses are presented for idealized single-domain spherical specimens. The total free energy expression which includes the contribution of the first-and second-order cubic anisotropy was employed to derive general FMR formulas. The deviation between magnetization equilibrium direction and applied field direction is strictly taken into consideration. The theory of ferromagnetic resonance previously developed is extended to handle the case for the static magnetic field with an arbitrary orientation with respect to the orystallographic axes. The theory is applied to several practical examples and is found to yield results which are in good agreement with experimental data. On the basis of these methods, the cubic anisotropy constants and the effective gyromagnetic ratio for a material can be calculated from measurments in any crystal planes. Related Articles | Metrics | Comments（0）

Select

A THREE-DIMENTIONAL FIELD THEORY FOR A FERRITE LOADED CYCLIC H-PLANE WAVEGUIDE JUNCTION SONG YINSUO Journal of Applied Sciences    1985, 3 (2): 143-154.   Abstract （355）      PDF（pc） （683KB）（62）       Knowledge map    Save In this paper, Copplestone's method is extended to analyse a ferrite loaded cyclic H-plane waveguide junction. Solving and matching in the electromagnetic fields in each region and simplifying the field equation are developed. The internal problem (solving and matching in the e. m. field) of the junction is transformed into a scattering matrix by menas of the eigenvalues of junction. A three-dimentional field theory for the ferrite-loaded cyclic H-plane waveguide junction is thus established. For g=3, the computed values agree well with experimental results. Related Articles | Metrics | Comments（0） Cited: Baidu(2)

Select

A MEASUREMENT METHOD OF METAL-SEMICONDUCTOR CONTACT RESISTANCE WU YUNZHONG, SUN CHENGLONG Journal of Applied Sciences    1985, 3 (2): 155-160.   Abstract （463）      PDF（pc） （401KB）（133）       Knowledge map    Save The influence of spreading resistance and probe-metal film contact resistance on the contact resistance of metal-semiconductor is generally neglected in the conventional methods used for measuring metal-semiconductor contact risistance. Thus errors would be caused when one uses these methods to measure the metal-semi conductor contact resistance. In this paper, according to the radial transmission line mode of circular ring electrode, an equation bearing the quantitative relationship between metal-semiconductor contact resistance and spreading resistance of thin film, probe-thin metal film contact resistance, current and voltage is derived. Based upon the equation, a new mode for measurement of metal-semiconductor contact resistance using four-point probe method is proposed. The metal-semiconductor contact resistance is accurately measured and the error sources from this measurement are discussed. Related Articles | Metrics | Comments（0）

Select

MICROWAVE PARAMETER MEASUREMENTS FOR GaAs DUAL-GATE MESFET YANG XINMIN, WANG WEIYUAN, WANG WENQI Journal of Applied Sciences    1985, 3 (2): 161-168.   Abstract （391）      PDF（pc） （1286KB）（61）       Knowledge map    Save The microwave parameters minimum noise figure NFmin associated gain Ga and gain reduction GR of a low noise GaAs dual-gate MESFET for UHF applications were measured by means of the mid-frequency attenuation method in microstrip test circuits. The S parameters were measured by means of network analyser. From the experimental data, the best noise figure NF0 of 0.8dB was obtained. The Ga and GR amounted to 11.5dB and 48dB, respectively. It was shown by S parameters that the dual-gate MESFET was stable over 0.5-2GHz. Related Articles | Metrics | Comments（0） Cited: Baidu(2)

Select

THE MAGNETIC AND MOSSBAUER STUDY OF Y-Gd-Ca-V-In IRON GARNETS ZHANG PANLIN, LING QIFEN, GUO SHUJIAO, LI GUODONG, ZHANG YIAOXI, ZHANG LI Journal of Applied Sciences    1985, 3 (2): 169-175.   Abstract （401）      PDF（pc） （434KB）（58）       Knowledge map    Save The magnetic properties, ferromagnetic resonance (FMR) and Mossbauer effect of Y1.2Gd1.2Ca0.6V0.3InxPe4.7-xO12 with x=0, 0.2, 0.4, 0.6 and 0.8 were studied experimentally. Using Neel, Gilleo and Dionne theories, the magnetic moments and Curie points were calculated respectively. It is shown that the experimental results were well in agreement with the Gilleo (Curie points) and Dionne (saturation moments) theories. The linearly incresing dependence of FMR line width with frequency (3.6-17 GHz) were discussed in terms of phenomenal theory. The occupancy of V5+ and In3+ ions in tetrahedral (d) and octahedral (a) sites were determined indirectly from the paramagnetic Mossbiuer spectroscopy. Related Articles | Metrics | Comments（0）

Select

PROPERTY OF SOLITARY WAVE SOLUTIONS OF SOME NONLINEAR DISPERSION EQUATION XU BAOZHI Journal of Applied Sciences    1985, 3 (2): 176-180.   Abstract （357）      PDF（pc） （250KB）（74）       Knowledge map    Save This paper discusses the solitary wave solutions of nonlinear dispersion Equation: ut+(au+βu2)x+γuxxx=0 (1) Related Articles | Metrics | Comments（0）

Select

THE RELATION OF INPUT-COUPLING EFFICIENCIES TO INCIDENT WAVE PROPAGATION CONSTANTS FOR PRISM COUPLERS LI YUSHAN, JIN FENG, LIN SHENGQIANG Journal of Applied Sciences    1985, 3 (2): 181-183.   Abstract （344）      PDF（pc） （185KB）（99）       Knowledge map    Save For the coupled system of the glass prism and the glass waveguide formed by ion exchange, changes of the input-coupling efficiency η as the incident wave propagation constant βi have been measured by detecting reflective light intensity of the prism base at different coupling gaps. There by, physics paramete rsrelated to input-coupling have been determined. Related Articles | Metrics | Comments（0）

Select

78 K INFRARED ABSORPTION METHOD FOR MEASURING THE OXYGEN CONTENT IN SILICON LI YUEZHEN, SHEN JINYUAN, REN NING, WANG QIMIN Journal of Applied Sciences    1985, 3 (2): 184-185.   Abstract （420）      PDF（pc） （136KB）（80）       Knowledge map    Save A more accurate calibration curve at 78K for measuring the oxygen content in silicon single crystals has been established by the infrared absorption difference method. The resulting formula is N0=2.6α ppmA, or N0=1.3×1017α atoms/cm3 where α represents the IR absorption coefficient. Related Articles | Metrics | Comments（0） Cited: Baidu(3)

Select

IN SITU THE MEASUREMENT METHOD OF EMISSIVITY FOR 8-14μm LU SIHUA Journal of Applied Sciences    1985, 3 (2): 186-188.   Abstract （409）      PDF（pc） （173KB）（43）       Knowledge map    Save The method described in this paper provides an improvement on,T. K. Buettner's method. It is simpler and more rigorous than that of Buettners. The instrumental error and personal error are discussed in detail. No significant differences have been found between our results and the generally accepted data. Related Articles | Metrics | Comments（0）

Select

SURFACE EXCITONS IN A POLAR CRYSTAL GU SHIWEI, ZHANG JIE Journal of Applied Sciences    1985, 3 (3): 189-193.   Abstract （311）      PDF（pc） （299KB）（64）       Knowledge map    Save In this paper, the effective Hamiltonian in ground state of surface excitons is obtained by the linear combination operator method and some simple unitary transformations. Related Articles | Metrics | Comments（0） Cited: Baidu(3)

Select

INVESTIGATION OF IMPERFECTIONS IN CRYSTALS BY MEANS OF NUCLEAR QUADRUPOLE DOUBLE RESONANCE CHENG GUANGQIANG Journal of Applied Sciences    1985, 3 (3): 194-200.   Abstract （275）      PDF（pc） （494KB）（70）       Knowledge map    Save Field-Cycling-Technique has boon successfully used for nuclear quadrupole double-resonance to investigate imperfections in crystals, to raise the sensitivity of the measurements and to measure the imperfections in Li3N. Quadrupole splittings of the imperfections and the double-resonance process are analyzed in this paper. At the end of this paper, a brief discussions is given to the measured absorption lines of Li3N. Related Articles | Metrics | Comments（0）

Select

POLARITONS (TE MODE) IN A DIELECTRIC PLANAR WAVEGUIDE ZHOU LICHONG, ZHOU XIAOLING, FANG JUNXIN Journal of Applied Sciences    1985, 3 (3): 201-207.   Abstract （430）      PDF（pc） （476KB）（98）       Knowledge map    Save Polaritons (TE Mode) in a dielectric planar waveguide has been studied. Taking ionic crystal of CsCl type as an example and using tight-binding approximation, we consider only the Coulomb interaction between electrons in the conduction band and holes in the valence band for nearest-neighbor sites and prove that when we deal with light-matter interaction, the material system can be regarded as an ensemble of a series of polarization wave oscillators. Furthermore, the intensity of oscillators is calculated and the dispersion relation, of the polaritons in a dielectric planar waveguide is worked out. The result shows significant difference from classical single oscillator model. According to our microtheory, the distances between upper dispersion curves of the guided-wave polaritons are larger than those obtained by using classical single oscillator model for several types of dielectrics which have wider energy bands and weaker interaction between electrons. Related Articles | Metrics | Comments（0） Cited: Baidu(1)

Select

NUMERICAL COMPUTATIONS FOR COPLANAR CIRCULAR DISK-SHAPED CRACKS OUYANG CHANG, XU LINLIN Journal of Applied Sciences    1985, 3 (3): 208-216.   Abstract （382）      PDF（pc） （508KB）（85）       Knowledge map    Save In this paper, a computational method for coplanar disk-shaped cracks within an elastic infinite body is presented. The basic idea is to use the single crack solution and the expansions of the local coordinates to reduce the complicated problem into a set of linear algebraic equations. By solving this set of linear algebraic equations, we could obtain the solution of multi-cracks problem finally. Numerical examples for 2, 3, 4 cracks show that the method presented here is quite workable. Results contained in this paper extend the content of "Handbook of Stress-Intensity Factors" by G. C. Sih. Related Articles | Metrics | Comments（0）

Select

THE RESEARCH OF REGULATIVE METHOD ON ANGLE OF INCLINATION OF STRAIGHTENER LUO JIASHUN Journal of Applied Sciences    1985, 3 (3): 217-222.   Abstract （490）      PDF（pc） （349KB）（75）       Knowledge map    Save In this paper, the anthor investigates computational method on regulation of the angle of inclination by means of geometric characteristics on double envelope of cylindrical surface and the theory of degree of contact between the two curves. Some new results are obtained. Related Articles | Metrics | Comments（0） Cited: Baidu(3)

Select

CLOSE-LOOP OPTIMAL SOLUTIONS FOR SOME PARABOLIC SYSTEMS WITH POINT WISE CONTROL (n=2,3) YAO YUNLONG, YOU YUNCHENG Journal of Applied Sciences    1985, 3 (3): 223-232.   Abstract （323）      PDF（pc） （594KB）（68）       Knowledge map    Save Closed-loop syntheses of optimal control is proved for the quadratic optimal problem of some parabolic systems with pointwise control on two and three dimensional domains. Their state feedback operators can be characterized by solutions of linear resolvent equations or Riccati integral equation. Related Articles | Metrics | Comments（0）

Select

A FUNCTIONAL FAULT MODEL AND A TEST GENERATION PROCEDURE FOR DIGITAL SYSTEMS MIN YINGHUA, Stephen Y. H. Su Journal of Applied Sciences    1985, 3 (3): 241-248.   Abstract （270）      PDF（pc） （532KB）（66）       Knowledge map    Save This paper introduces a functional fault model for digital systems described by Register Transfer Language (RTL). A formal definition of standard statements in RTL is given, the functional faults are thug classified into eight types. A procedure for generating tests for any given functional fault is presented by using the inverse operation of the ETL description of the system under test. It is interesting to know that once the behavior of a digital system is described by RTL, similar ideas used in test generation for stuck-at faults can be pushed up to RTL level with each RTL statement as a "Component" of the system. Related Articles | Metrics | Comments（0）

Select

RADIOASTRONOMICAL MEASUREMENTS OF THE ATMOSPHERIC ABSORPTION AT THE CENTIMETER WAVELENGTH YUAN HUIREN, PEN YUNLOU, XUE YINZHANG, WEI SHUANGLIN, ZHOU FENGAN Journal of Applied Sciences    1985, 3 (3): 249-254.   Abstract （318）      PDF（pc） （356KB）（74）       Knowledge map    Save In this paper, we discussed the basic principles and methods for measuring atomspheric absorption at λ=2.5cm, 3.2 cm and 7.5 em by observing electromagnetic radiation of the moon and listed the results of measurements. We found that the results of measurements coincide with the theoretical value at λ=3.2cm. Related Articles | Metrics | Comments（0） Cited: Baidu(4)

Select

STUDIES IN OPTICAL DEVELOPMENT OF FREE RADICAL PHOTOGRAPHY ZHENG GUANGLIN, SHI DAOJUN, HUANG XIAOLAN Journal of Applied Sciences    1985, 3 (3): 255-261.   Abstract （478）      PDF（pc） （481KB）（53）       Knowledge map    Save A quantitative characterization parameter in. optical development of free radical photography Kmax is proposed and its significance and method of measurement are elucidated. Effects of the wavelength (used) on the optical development of Leuco crystal violet/CBr4 film and the effects of the adhesive medium and temperature on the rate of optical development have been studied. The activation energy is estimated at about 10kcal/mole. The induction period of optical development has also been interpreted. There are two different processes in optical development. In the induction period oxygen quenching of the excited dye molecules by the diffusion-control predominates while in the main period of the reaction energy transfer-control photochemical reaction predominates. Related Articles | Metrics | Comments（0） Cited: Baidu(2)

Select

A NEW WAY FOR IMPROVING THE CRYSTALLINE QUALITY OF SOS FILMS CHEN QINGGUI, SHI RIHUA, CAI XIJIE, WU YUNGZHONG, SUN OHENGLONG, PAN YAOLING Journal of Applied Sciences    1985, 3 (3): 262-266.   Abstract （355）      PDF（pc） （1125KB）（58）       Knowledge map    Save In this paper, a new method for improving the crystalline quality of SOS films is developed.lt consists of three steps:(1) A thin amorphous silicon layer is prepared by electron beam evaporation. (2) The wafer is annealed in a hydrogen atmosphere. (3) The required thickness (0.6-0.8μm) of SOS film is deposited by the standard OVD method on the thin silicon layer. The resulting SOS films are examined by reflection electron diffraction, Nomarski phase interference microscopy, carrier concentration measurement and optical absorption measurement. The results show that the crystalline perfection of the film is good,the optical absorption factor FA ≤ 140×106cm-2. The autodoping is expressed and the carrier concentration is lower than 1×1013cm-3. Related Articles | Metrics | Comments（0）

• page
• Page 1 of 2
• Total 56 records
• First page
• Prev page
• Next page
• Last page