Table of Content

31 March 1991, Volume 9 Issue 1

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Articles

GEOMETRIZATION NUMBER THEORY ELIMINATINGSINGULARITY APPROACH TO THE THEORYOF ELECTROMAGNETISM (I) The Theoretical Formulation of GNES Approach

DAI XIANXI

1991, 9(1):  1-7. 

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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.

A CLASS OF MULTIPLEXED SEQUENCES CONTROLLED BY A CLOCK

LI XIANGANG

1991, 9(1):  8-16. 

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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.

THE HEAT GENERATION FUNCTION ANDCONTROL EQUATION OF TEMPERATUREFIELD IN VISCOELASTIC MATERIAL

C. OUYANG, Xu ZHENGYI

1991, 9(1):  17-23. 

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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.

SIMILARITY FOR LOSSY ELECTROMAGNETIC SYSTEMS

SHI ZHENDONG

1991, 9(1):  24-28. 

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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.

THE METHODS TO CONSTUCT THE ITERATIVE FUNCTIONS

ZHANG HONGZHI

1991, 9(1):  29-42. 

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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.

ADHESION IMPROVEMENT INDUCED BY6MeV F IONS FOR THIN METAL FILMS ON TEFLON SUBSTRATES

LIU ZHENGMIN, YANG YING

1991, 9(1):  43-48. 

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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.

THE PREDICTION OF ELECTROMAGNETIC CHARACTERISTICS OF COATING TYPE WAVE-ABSORBING MATERIALS

JIA BAOFU, LIU SHUZHANG, LIN WEIGAN

1991, 9(1):  49-54. 

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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.

DEVELOPMENT OF SMOKE SENSOR OF SINGLE-SOURCE AND DUAL-IONIZATION CHAMBERS

BI QINGHUA, RONGQIAN

1991, 9(1):  55-60. 

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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.

THE INVESTIGATION OF ELECTRICAL CHARACTERISTICS OF Al-Ti/W-PtSi-Si SYSTEM

LI SIYUAN, ZHANG TONGJUN, WANG XIAOGANG, JIA XIAOTIAN

1991, 9(1):  61-68. 

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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.

CALCULATION OF THE BASE DISPERSE RESISTANCE OF PHOTOTRANSISTOR

FANG LONGSEN

1991, 9(1):  69-78. 

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This paper first gives the calculating method that includes the analysis formula, that is,
R_outer=R_S·L·(L_E²+2L_EW-W²·L_n(L_E/W))/(N·(W-L_E))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.

A STUDY ON CURING PROPERTIES OF LIQUID TERPENE-MALEIC ANHYDRIDE ADDUCTS FOR EPOXY RESIN

GAO NAN, JIN QILIANG, HUANG CHEN, SHEN JIANGHUA

1991, 9(1):  79-85. 

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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.

Research Notes

EMPERATURE DEPENDENCE OF CYCLOTRON MASS OF AN ELECTRON IN A SEMICONDUCTOR QUANTUM WELL

ZHAO XUNJIE, GU SHIWEI

1991, 9(1):  86-90. 

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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.

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

1991, 9(1):  91-94. 

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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.