Table of Content

31 March 1996, Volume 14 Issue 1

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Articles

WAVE REFLECTION FROM THE MULTIPLESLAB-GENERALIZED FRACTAL LAYERS

CHEN LUJUN, LIANG CHANGHONG, SHI XIAOWEI

1996, 14(1):  1-6. 

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The reflection and tranEmiedon spectra of oblique-incident waves at a wultiple-slab-generalized fractal layer which consists of a fraotal set are studied.A generalized method,with self-similarity, is used for this purpose.The genemlized formulae as well as a new type of reflection and transmission spectra,i.e., the self-similar spectra, are obtained.This type of spectra may be used in electronic countermeasure, film optics and photoelectronic devices,and so on.

INTERLAYER EXCHANGE INTECRALS NEAR THE SURFACE OF A FERROMAGNET

WU XUEYUAN, GU SHIWEI, LI WEISHENG

1996, 14(1):  7-10. 

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THe in Inwhayer exchange Paramters near the surface of a ferromagnetic film have been calcuated;and they have been extended to the case of the semi-infinite sample.The results exhibit that the exchange interaction near the surfare is greater than that of the bulk.This confirms theoretically the assumption made by Mills.

THE BOUNDS OF EFFICIENCY AND POWER OFAN IRREVERSIBLE CARNOT ENGINE

YAN ZIJUN, TIAN XINQUAN

1996, 14(1):  11-15. 

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In this paper, the highest and the lowest bounds of the efficiency and power if an irreversible steady-state-flow Carbon engine with external thermal resistance and internal heat leak were studied. Some significant discussions were done.From this,two new criteria for the selection of the working parameters of the engine were provided.

AN EFFICIENT INEXACT REASONING ALGORITHM

LU ZHENGDING, HU HEPING, LI FAN

1996, 14(1):  16-25. 

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The paper presents an inexact reasoning algorithm based on fuzzy production rule matrix transformations, and interprets the inference process of the algorithm with examples.Furthemore the paper proves that the complexity Of the algorithm is O(n+1) for the knowledge system with n fuzzy production rules.

THE DEGENERATION OF FUNCTIONS OVER RING Z_k

FENG DENGGUO, XIAO GUOZHEN

1996, 14(1):  26-29. 

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The concept of the Ohrestenson spectrum over Ring Z_k is presented. in this paper;and the degeneration and the characteristic of linear structures of the functions over ring Z_k are discussed using the spectrum.

AN ENTROPY BASED 3D EDGE DETECTION METHOD

XIE XIAOHUA, LUO LIMIN, WEI YU

1996, 14(1):  30-34. 

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This paper proposes an exponential behavior based entropy operafor for 3D edge detection.The surface point can be located by the entropy of a local window and the orientation of the surface can be decided by the coordinates of the centroid of the window.A related fast algorithm is presented. The experimental results verify that the method is efficient for 3D medical images.

AN ALGORITHM FOR DECIDING QUADRATIC BOOLEAN FUNCTIONS BY COUNTING

DING ZUOLIU

1996, 14(1):  35-40. 

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An algorithm is proposed to decide whether a function of n variables is a quadratic Boolean function.If so, how can we obtain the quadratic terms? Different from the Quine-McOluskey method, our algorithm is based on the counting of values 0, and allows a high 1evel of parallelism.

THE OVERALL STABILITY OF SOME NONLINEARNON-FORCED NETWORKS AND ITS APPLICATION

LIU XIAOHE

1996, 14(1):  41-47. 

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In this paper,the overall stability of some nonlinear non-forced networks with the disposed parallel characteristic is studied. The anther puts foward some applied criterions for the overall asymptotic stability and overall exponential stability,and the example of continous Hopfield neural networks is discussed for the application.The result of the paper is applicable to the nonlinear non-forced network with nonreciprocal resistor and local active resistor.

APPLICATION OF MUTUAL INFORMATION TO ANALYSING TIME SERIES

ZHAO HONG, CHAI LU, WANG HAO, LIU SHUSHENG

1996, 14(1):  48-52. 

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According to the information Theory, we introduce a method with which we can quantitatively calculate the mutual information of two systems S and Q,i.e.I(S; Q)=∑P(s_i,q_j).log[P(s_i,q_j)/P(s_i)P(q_j)].The predictability of the data of a system was analyzed and the optimal prediction precision was obtained by the computing results of the mutual information between the one dimensional time series and its time delayed series from the time period systems,chaotic systems and random systems. The dissimilarity of the data of a system was estimated by the computing regular of the mutual information between the two dimensional time series from time period systems, chaotic systems and randoms systems,thus the waive of releasing the work could be avoided. Compared with the cross correlation function,the mutual information can quantitatively show the relation between the two time series.

REALIZATION OF OUTPUT DECOUPLING OF A PULSEREBALANCE LOOP FOR A STRAPDOWN TUNED GYRO

LI HONGSHENG

1996, 14(1):  53-59. 

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In strapdown systems, rebalance loops connected with tuned gyros are generally designed based on control decoupling, while output decoupling is realized by proceeding their output current data. This paper discusses the realization means of output decoupling in detail,establishes the computation equations,designs the hardware construction and software flow chart.Simulation shows that the effects of decoupling are satisfying. The described plan therefore is feasible.

CCⅡ-BASED-βRC CURRENT-MODE BIQUADRATIC FILTER DESIGN

XIAO GAOBIAO, WU JIE

1996, 14(1):  60-66. 

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A class of current-mode biquads using the -β current amplifier and RO components are presented in this paper.They are derived directly from the Salled-Key -kRO voltage-mode biquads by dual transformation.COⅡ devices are used as convenient current amplifiers here. These biquads can be cascaded directly.

CALCULATION OF EFFECTIVE EM PARAMETERS OFRANDOM MIXTURE CONTAINING ELLIPSOIDALPARTICLES WITH DIELECTIC COATING LAYERS

LIU SHUZHANG, QIU CAIMING

1996, 14(1):  67-72. 

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A new procedure is used to derive the extended electromagnetic mixing formulas.The corresponding formulas for the ellipsoidal particles having multilayered enclosure is obtained, and the effects of particles on the effective EM parameters are analyzed.

TRAPPING CHARACTERISTICS OF THE SHALLOW IMPURITY ENERGY LEVEL IN SILICON AT LOW TEMPERATURES

ZHENG JIANG, XIAO ZHIXIONG, WU JIN, WEI TONGLI

1996, 14(1):  73-77. 

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In this paper,the.trapping effect of the shallow impurity energy level in silicon at low temperatures is analyzed. The expression for the ratios of the injected electrons in the conduction band to the total electrons n_C/n_T at various injection levels in p-type silicon is given. The main. results indicate that the trapping effect of the shallow impurity energy level under the low injection condition will exert a tremendous influence on the frequency properties of bipolar devices at low temperatures, and it becomes neligible at the high injection level because the total injected electrons overwhelm the carrier trapping effect.

THE INyESTIGATION OF INTERFACIAL STABILITY DURING Te SOLUTION GROWTH OF SMSC Cd_1-xMn_xTe

MO YAOWU, WU WENHAI

1996, 14(1):  78-85. 

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Cd_1-xMn_xTe crystal films were grown in the OdTe seed crystal from Te solution,using the revolving liquid phase epitaxial(LPE) configuration designed by us. The crystal film, typically~0.4mm thick and 0.5cm² in area, stood at an angel wish the seed crystal plane.The stability of the interface between the solution and solid phases during the growth process was studied using the linear stability analysis proposed by Mullins and Sekerka.The influences of heterogeneity in interfacial energy and causes of forming the ripple morphology on the crystal film surface were analyzed. Oonditions for the stable liquid phase epitaxy were probed.

DEVELOPMENT OF A POLYIMIDE FILM CAPACITIVE GATE FET HUMIDITY SENSOR

LUO RUFANG, LU DEREN, LU YUPING

1996, 14(1):  86-90. 

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A micro HUMFET with a polyimide(PI) film humisensing capaoitor lying on the insulating gate was developed. It is an n-channel enhancement mode device with a meandering gage of 10μm in channel length and >8000μm in channel width and with a double insulating gate(SiO₂+Si₃N₄) of about 30nm.The hnmi-sensing capacitor lying on the insulating gate is an Au-PI-Al capacitor.
The structure design and operation principle of the PI-HUMFET were described.The measuring result of the characteristics of the device was reported and some relative problems were discussed.

STUDY ON THE PHOTOCROSSLINKED POLY (VINYL ALCOHOL)HYDROGELS AND PENICILLIN SENSITIVE BIOSENSOR

JIA DEMIN, PANG YONGXIN, GUO BOPING, LI HUI

1996, 14(1):  91-96. 

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A novel photocrosslinked poly(vinyl alcohol) hydrogel was prepared and applied to entrap β-lactam penicitllinase.The properties of the hydrogel and immobilized enzyme were thoroughly investigated. Results show that the hydrogel is very suitable for the immobllization of β-lactam penieillinase.The stabilities of the immobilized enzyme to PH value of the medium, temperature and storage are better than those of the free β-laotam penioilllnaee. Also the immobilized enzyme membrane is connected to a pH-sensitive field effect transistor to form a penieillin-sensitive biosensor. The specifications of the resulting biosensor are as follows:response time less than 60sec, sensitivity to penicillin larger than 3mV/mM,1inear response range of 0~16mM, and very good storage stability.When it is applied to determine the penicillin content of the fermenting mixture during the production process, the results are found to conform to those obtained by the conventional iodine titration.

MARTENSITIC TRANSFORMATION IN Fe-29WT% NiALLOY ULTRAFINE PARTICLES

CHEN YUNHONG, JIANG YUMEI, DENG GUICHANG, LU HUAIXIAN, LI GANG

1996, 14(1):  97-102. 

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The ultrafine particle samples of Fe-29 wt% Ni alloy with different average diameters(12 to 100nm) are prepared by the evaporation condensation method in the atmosphere of N₂.They are a mixture of martensitio α'(bcc) and the austenite γ(fcc).Each individual particle is a single crystal (bcc or fcc). The volume fraction of martensite increases evidently with the decrease of the average diameter. During heating, as the average diameter decreases, the temperature (Aa and Af) for α'-γ reverie martensitic transformation comes down, and the range(As-Af) of the transformation temperature becomes narrower. However, during cooling (up to 77K), we have not found the martensitic transformation. The stabilization of the austenite and the growth mechanism of the martensite and austenite are preliminarily discussed in this Paper too.

THE RESEARCH ON THE CUTTING EQUATION FORTHREE-DIMENSIONAL CUTTING

ZHANG WEIJI

1996, 14(1):  103-107. 

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The cutting equation for three-dimensional cutting is presented in this paper.The deduction of this equation agrees with our test results very well.

A NEW TYPE PHOSPHOR SrAl₂O₄:Eu WITH LONG AFTERGROW LUMINESCENCE

CHEN JIYAO, SONG QINGMEI

1996, 14(1):  108-112. 

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A new type phosphor SrAl₂O₄:Eu with long persistent aftergrow in the system of SrO-Al₂O₃ was reported in this paper.The phosphor was found in the SrAl₂O₄ monoclinic crystal structure as measured by X-ray powder diffraction.The luminescence of phosphor was the typical d-f transition of Eu²⁺, according to the excitation spectrum and emission spectrum. After excitation by the UV fluorescent lamp, the aftergrow luminescence of phosphor could last 10 h with a hyperbola type decay, showing the characteristic of recombination luminescence.The measurements of thermoluminescence spectra showed that there were two thermoluminescence peaks lying at 333°K and 378°K, reflecting that the electron traps existed in the Phosphor. furthermore,experiments exhibited that the impurity component Mg formed the electron traps and made the phosphor possess the long aftergrow luminescence property.

RELIABILITY LIFE CALCULATION AND EXPERIMENTALRESEARCH ON WEAR OF THE THRUST BEARING

ZHANG ZUMING

1996, 14(1):  113-118. 

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Based on the wear law and reliability theory of the thrust bearing,the mathematical model of reliability life calculation on the wear of the thrust bearing is derived. An on-line measuring device of the speeding up wear for the thrust bearing is developed. The wear rate of the parts is measured.We find the measured value conforms to the theoretical calculation, thus proving the correctness of the model. Furthermore,it is believed that the model can provide scientific theory,method and experimental data for the reliability life calculation on the wear of the thrust sliding bearing.

THE FORMING THEORIES OF ROTARY TOOLS ON FIVE-AXIS NUMERICALLY CONTROLLED GRINDER

LIU HURAN

1996, 14(1):  119-126. 

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This thesis researched the foraging theories of rotary cutting tools on the fiveaxis numerically controlled grinder,and deduced the nonlineal equation systems of the relative movement satisfied by the banding wheel and the work.The groove was formed in one awoke,while the normal rake angle remained constant.