Table of Content

31 March 1987, Volume 5 Issue 1

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Articles

STRESS INTENSITY FACTORS FOR PERIODIC STIFFENED STRIPS WITH RANDOM CRACK AND/OR HOLE

OUYANG CHANG, ZHOU XIAOKANG

1987, 5(1):  1-15. 

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This paper diseusses periodio stiffened strips made with two different kinds of materials and each strip with a random oraek or hole. The strueture is under extension along the longitudinal direction. Stress intensity factors at the craek tips are computed by complex variable functions and perturbation method and formulas are given in power series forms. For applied structures in engineering, numerical tables and figures are given for stress intensity factors. These results extend further the contents of "Handbook of Stress Intensity Factors".

LASER SCANNING PHOTOELECTRIC MICROSCOPE

ZHANG SHXIYI, CHEN LI, XU JIANSHENG

1987, 5(1):  16-21. 

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Using the photoelectrie effect of semiconductors (materials and devices), a new imaging detection system, photoelectric microscope, has been established. Some static and dynamic photoelectric imagings of several integrated circuits have been obtained by the microscope. Thee results show that the photoelectric microscope can be used not only to detect the static defects of various integrated circuits (including large scale integrated circuits), but also to search the logic levels and charges distributions in integrated circuits. It provides a convenient and effective, non-contacting and nondestructive technique that can be used in normal atmospheric circumstances for integrated circuits failure analysis.

EXPERIMENTS AND APPLICATIONS OF X-BAND FM-CW RADAR SYSTEM ON SEMI-SUBMERGED DRILLING WELL PLATFORMS

ZHOU NANSHAN, TANG WEI

1987, 5(1):  22-29. 

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Introducing the design scheme and analysing the experimental results, the paper proves that the X-band liquid level guage made according to the FM-CW principle can be used on semi-submerged drilling well platforms. The theory and practice indicate that the operating distance to sea level is more than 30 meters for all weathers. Three static parameters:the water depth, the transversal and longitudinal dip angles are measured above waving sea using appropriate automatic data processing and the accurancy of the measurement is satisfying.

pn JUNCTION ANALYSIS WITH TRANSMISSION LINE EQUIVALENT CIRCUIT MODEL

RUAN GANG, RONG MENGTIAN

1987, 5(1):  30-36. 

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In this article, we analyse the pn junction injected by deep level impurity based on an exact transmission-line equivalent circuit model. We put forward the sche mes of program by modifying the model according to different pn junction, conducting mechaaism under various kinds of working status. The input parameters are doping profile, SRH coefficients of recombination centers and geometric parameters of pn junction. The program can provide pn junction ac and do characteristics and inner information such as density of carriers. The experiments show that the simulation results agree quite well with one of the measurements.

A STUDY ON α-COPPER PHTHALOCYANINE EVAPORATED FILM TRAP——AN ISOTHERMAL DECAY CURRENT SPECTRUM

QIAN RENYUAN, ZHOU SHUQIN, JIN XIANGFENG, WAN ZENGQI, JIANG SHOUREN

1987, 5(1):  37-40. 

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An investigation of Isothermal Decay Current (IDC) method on determining trap parameter has been made on the α-copper phthalocyanine evaporated films at different temperatures and electric fields. It shows that the trap behaves like a distributed trap of depth 0.58 eV and attempt-to-escape frequency 1.7×10⁸ s^-1. The field dependence of IDO current indicates a field assisted detrapping probably in the sense of Poole-Frenkel mechanism.

THE DIFFERENCE BETWEEN METAL IONS EXTRACTED FROM THE R. F. ION SOURCE BY APPLYING PLASMA CHEMISTRY REACTION AND NON-PLASMA CHEMISTRY REACTION

BAI GUIBIN

1987, 5(1):  41-48. 

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The paper introduces the difference between using plasma chemistry reaction and non-plasma chemistry reaction to draw metal ions from the E. F. ion source. Plasma chemistry reaction is applied to the E. F. ion source and the implanter successfully. The effect, having its own characteristics, is very satisfying. By means of plasma chemistry reaction combined with physics, metal ion beams, especially the beams of high volatility temperature, are obtained easily. These ions are:Re⁺, W⁺, Mo⁺, Y⁺, Nd⁺, Pd⁺, Au⁺, Ta⁺, Ti⁺, Cr⁺, Ce⁺, Ag⁺, Fe⁺, Cu⁺, V⁺, Al⁺, Be⁺, Li⁺, Si⁺, Ga⁺, In⁺, Bi⁺ and so on.

APPLICATION OF SIGNIFICANT STRUCTURE THEORY IN EVALUATION OF THERMODYNAMIC PROPERTIES OF LIQUIDS

YAN WENHSING, SUN YAPING

1987, 5(1):  49-55. 

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By modifying Eyring's significant structure theory, thermodynamic properties-molar volumes, entropies, molar heat capacities at constant pressure and constant volume——of liquid ethylene, ethane, hydrogen cyanide, carbon disulfide and pyridine are calculated. It is found that the results are in good agreement with experimental values.

SYNTHESIS AND PROPERTIES OF SEGMENTED POLYETHER URETHANEUREAS EXTENDED WITH WATER

HUANG ZUXIU, FENG XINDE

1987, 5(1):  56-60. 

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Segmented polyether urethaneureas (SPEU-W) were synthesized from 4, 4'-diphenylmethane diisocyanate (MDI), polytetramethylene glycol (PTMG, M_n=1100) and water as chain extender by two-step solution polymerization. The physical properties and anticoagulant activity of the polymers prepared were measured. The experimental results showed that the extent of phase separation and the anticoagulant activity of SPEU-W were almost the same as those of polyether urethaneureas based on MDI, PTMG and ethylenediamine chain extender and better than those of polyether urethanes based on MDI, PTMG and butanediol chain extender.

A STUDY OF RADIATION DAMAGE IN (Hg·Cd)Te CRYSTAL BY HREM

SONG XIANGYUN, WEN SHULIN, MA KEJUN

1987, 5(1):  61-65. 

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The microstructure of (Hg. Od) Te crystal was studied by HREM. An electron radiation damage was found along the[110] direction of the crystal. A further study of EDAX, HREM and electron diffraction showed that the CdTe phase could be segregated from (Hg. Od) Te crystal by electron radiation, and structure disordering could occur in some areas due to the radiation. Moreover, atom displacements were occurred in the (Hg. Od) Te crystal due to the electron radiation, resulting superlattice phenomenon in the crystal.

RF SPUTTERING OF InP FILMS

LI XIQIANG

1987, 5(1):  66-71. 

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The present paper is a report on the deposition of InP films on different substrates by sputtering. Using SEM, AES, X-ray diffractions, RED and infrared spectrophotometer, we have studied the topography, composition, crystal orientation, absorption edge spectrum etc.

RESEARCHES ON InP OHMIC CONTACT

WU DINGFEN, WANG DENING, ZHANG JUN

1987, 5(1):  72-78. 

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The values of specific contact resistance (p₀) for both Au/n-InP and Au/p-InP have been calculated theoretically based on the carrier transport study of metal-semiconductor systems. The results, which are presented graphically, show the dependence of p₀ on impurity concentration from 10¹⁸ to 10²¹cm^-3, and the barrier height from 0.3~1.0 eV. It is found that the Schottky barrier height (φ_B) would not be changed with annealing temperature below 350℃ in 3 min. When the annealing temperature is higher than 350℃, a poor ohmic contact will be formed in the case of Au/n-InP system, but for Au/n-InP system, only a reduction of φ_B will be observed. It is determined that an obvious alloying takes place at about 350℃. The computed theoretical results are used to interpret the experimental data of Au Zn/p-InP ohmic contact published in the literatures and the problems exist in our p-type ohmio contact technology are discussed.

GENERATING ALL NONISOMORPHIC ROOTED TREES AND ALL NONISOMORPHIC TREES

LLU JLAZHUANG

1987, 5(1):  79-84. 

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In the present paper, the representative sequence of path lengths of a rooted tree and that of a tree is defined. It is found that between the treeg (resp. rooted trees) of order n-1 and that of order n, there exist simple relations between their sequences of path lengths. Making use of the relations, we obtain algorithms which generate the sequences of path lengths of all nonisomorphio rooted trees and all nonisomorphio trees. The storage required is less than that of the algorithm in[1], and the computer time required is less than that of the algorithm in[2].

MEASUREMENT OF XPS LINE SHAPE WIDENING FUNCTION

XU ZHIZHONG, DONG SHUZHONG

1987, 5(1):  85-88. 

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The transmission function of the electronic energy spectroscope can be obtained from XPS core level speotra by the deconvolution method. Making convolution of the frequency distribution function of X-ray source with it, we have calculated the XPS line shape widening function. The result agrees well with that obtained from the valence level speotra of transition metals.

MARCHUK MODEL AND RECOVERY FROM DISEASES

SHAO JIAN

1987, 5(1):  89-91. 

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Regarding the simple mathematical model of a virus disease suggested by G. I. Marchuk, a problem of time of recovery from diseases is suggested in this paper, We use the technique of dynamic programming for this problem. It is shown that the immunological level of plasmacytes in the organism must reach the suboptimal state in order that one may be recovered from virus diseases in a minimum amount of time.

RAPID MONOESTERIFICATION OF ADIPIC ACID AT A LOW TEMPERATURE

GUI WEIZHI

1987, 5(1):  92-94. 

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A new process of rapid monoesterification of adipio acid at a low temperature is introduced.It is found that the esterification can be carried out very economically for it can be carried out at a temperature as low as that of 80 C and can be heated up by evaporation of water, not necessarily by electrothermal. Moreover, corrosion can be avoided since catalysts of strong aoid and strong alkali are substituted by resin catalysts. And monoesterification can be fulfilled in half the time spent on ordinary processes.