Table of Content

30 September 1983, Volume 1 Issue 3

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Articles

RELATIONSHIP BETWEEN FUNDAMENTAL SCIENCES, APPLIED SCIENCES,AND PRODUCTIVE TECHNOLOGY

MENG CHAOYING

1983, 1(3):  189-192. 

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From the viewpoint of production, the task of productive technology may be considered as the study aimed at solving productive problems of "today"; the task of applied sciences, that of "tomorrow"; and the task of fundamental sciences, that of "day after tomorrow". The first is of paramount importance because it involves the immediate well-being of the whole people, therefore the main force should be allotted. However, without research in applied sciences, means of production will soon become obsolete. So enough effort should be applied to it. The task of fundamental sciences is to study the ultimate nature of the universe, matter, and life. Most of the fruits of its research have no direct connection with production, but some findings thereof may open up entirely new means and directions, so it should not be neglected either.

SOME NEW PROPERTIES OF SPLINE FUNCTIONS IN A CONVEX SET

GUAN LUTAI

1983, 1(3):  193-202. 

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In this paper, "outer projection set" and "projection face" are defined and some new characterization theorems, unioity theorems and necessary conditions of spline functions in a convex set are obtained. We introduce theorem 7 as follows:if there exist unique σ and σ₁ satifying.

ON STABILIZATION FOR A CLASS OF LINEAR RETARDED CONTROL SYSTEMS

YOU YUNCHENG

1983, 1(3):  203-210. 

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In this paper, stabilization of linear retarded control system on Banach spaces
>dx (t) /dt=Ax (t) +∑_i=0^k (B_iu (t-r_i)) +∫₁⁰ (B (θ) u (t+θ) dθ,t ≥ 0, (0=r₀ < r₁ < … < r_k=r<∞)).

TRANSLUCENT ALUMINA CERAMIC ARC TUBE

ZENG SHAOXIAN, FU XIREN, ZHU HUIGING, WEN HEGEN

1983, 1(3):  211-220. 

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The strict size of polycrystalline translucent alumina ceramic are tube is paramount importance for the production of long life high, pressure sodium lamp, while lamp efficacy is affected by transmittanoe of light in the ceramic are tube. The present paper studied the processing of alumina tube formed by isostatio pressing. The effect of the characteristics of starting materials, additives and heating condition on the miorostruoture and light transmittance of the alumina arc tube obtained were investigated. Arc tubes with strict size, uniformly sized grains and a total light transmittance of 94~95% are now fabricated in mass production.

STUDY OF MÖSSBAUER EFFECT, FERROMAGNETIC RESONANCE AND COERCIVE FORCE OF COLUMNAR CRYSTALLINE Fe-Cr-Co-Mo-Ti AND ALNICO 5 PERMANENT MAGNET

LI DEXIN, LIN WENGUI, LI GUODONG, YAN YONG, SHAO HANRU, CHEN MINGYAY, WANG HUIJUAN

1983, 1(3):  221-226. 

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The orientation of magnetic moments of columnar crystalline (CO) Fe-Cr-Oo-Mo-Ti permanent magnet is investigated by means of Mossbauer effect (ME) at room and low temperatures, and by means of ferromagnetic resonance (FME.) at room temperature (RT). The result is compared with that of CC Alnioo 5. The orientation of CC samples is better, and higher coercive force H_o may be obtained. The H_o variation between RT and 77K is measured, with H_o reduced with decreasing temperatures. This fact is duo to the transition to ferromagnetic phase from paramagnetic phase and to the reduction of the difference of magnetization. It appears that the mechanism of reverse magnetization is agreement with the model of rotation of single-domains.

C-H BOND DISSOCIATION ENERGIES AND STRETCHING FREQUENCIES

JIN ZUQUAN

1983, 1(3):  227-234. 

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In this paper, correction between C-H bond dissocition eneries and average stretching vibration frequencies is discussed. The C-H bond dissociation energies may be calculated by.

THE GROWTH AND CHARACTERICS OF S-DOPED LOW DISLOCATION InP SINGLE CRYSTALS

FANG DUNFU, WANG XIANGXI, XU YONGQUAN, MIAO HANYING, MOU PANJIAN

1983, 1(3):  235-242. 

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Low dislocation InP crystals in a<111>P direction were pulled with a liquid encapsulated Czochralski technique by impurity doping procedure. Grown-in dislocations were diminished when the sulfur or sulfide was doped. The impurity effect on the dislocation density was examined. Dislocation density was obviously decreased when sulfur concentration exceeded 2×10¹⁸ cm^-3 with compensation ratio in the range of 0.1~0.3. The coefficient of effective distribution of sulfur in InP grown by LEC is 0.68.
Since S-doped InP crystals have better radial and longitudinal homogeneity than Sn-doped ones, it will bring about stabilization in device fabrication and improvement in material applicability.

A NEW METHOD FOR SELECTIVE ETCHING OF GaAs

LU FENGZHEN, DING YONGQING, PENG RUIWU

1983, 1(3):  243-248. 

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A new electrochemical method has been developed for selective etching of semi-insulating QaAs (gallium arsenide) using citric acid-hydrogen peroxide-water system. The effects of electrolyte composition, etching time and current density on the etching rate are studied. The etched surfaces are also examined by SEM. The experimental results show that a smooth surface and flatbottomed holes can be obtained with this method. Based on simple faradic analysis, it is found that the effect of DO current is to make the surface smooth, but the dissolution mechanism of GaAs in electrochemical etching is, probably, mainly due to chemical reaction.

MEASURING TECHNIQUES AND APPLICATION IN BIOMECHANICS

WANG YIJIN, WAKG GONGLIN

1983, 1(3):  249-256. 

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The performance of biomechanical problems in the skeletal system associated with the problem of employing suitable experimental methods is discussed in this paper, since such experimentation is very important in the implants of bones and the replacement of joints. At the same time, the changes in mechanical strength cf compact bone tissue and the mechanical problem in clinical orthopaedics have found.

FLUCTUATING LIFT FORCE ON CASCADE MOVING THROUGH A SMALL SHEAR FLOW

ZHANG BAODONQ

1983, 1(3):  257-266. 

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The behaviour of rotor blades moving through the wake flow coming from stator departs from one which is designed by the potential flow theory, for example, the lift force on the blades is fluctuating. Hence the total pressure in flow is changeable. Based on the vortex theory, the present paper deduces an expression of the fluctuating lift force on cascade moving through a small shear flow, and presents a simple computational method by using the suggestion given in Ref.[4]. Comparison with the experimental results of Ref.[9] is satisfactory. Our method helps the rotor designer to adjust the design parameters selected.

A STUDY FOR THE PARAMETERS OF CHINA-MADE SOLAR CELLS

CAO ZECHUN, AN QILIN, HUAN JIAMET

1983, 1(3):  267-269. 

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Several silicon solar cells made by factories in China have been examined. Based on series resistance measurements and illuminating I-V curves, ‘A’ factor and reverse saturated current I₀ can be calculated. From analysis of these data it is seen that the main factor causing efficiency drop of solar cells is the leakage current.

SEPARATION OF HYDROGEN ISOTOPES BY USING A TEA CO₂ LASER WITH A LONG FWHM

MUO GUOXIONG, LI CHANGLIN, CHIN CHITSUNG

1983, 1(3):  270-272. 

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FWHM 300ns TEA CO₂ laser was used for separating hydrogen isotopes. The enrichment coefficient was about 2.5 which tallies with the extrapolated value by Marling's experiment. The relation of FWHM and the enrichment coefficient was given as.

THE INFLUENCE OF Cr-DOPED S.I-GaAs SUBSTRATE ON THE ELECTRICAL CHARACTERISTICS OF IMPLANTED LAYERS

SHAO YONGFU, CHEN ZIYAO, PENG RUIWU

1983, 1(3):  273-276. 

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The carrier concentration and mobilities profiles of implanted layers on the Cr-doped S. I-GaAs after annealing depend on the substrate qualities. In many oases, the departure of carrier concentration profiles from the L. S. S. curve is due to the presence of high background impurities in the substrates, while the Hall mobility profiles of implanted layers are influenced by the residual stress from radiation damage.

PATTERN RECOGNITION OF DYNAMIC PROCESS

DAO KUNSEN

1983, 1(3):  277-278. 

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The technique of image processing is being widly used. This paper studies pattern recognition of a random peocess and describes a random process processing using feature matrix.
The wirter uses Discrete Fourier Transform to reduce the amount of data. In decision process he utilizes the minimum distance classifier. Finally he also discusses error probability in classification.

THE EFFECT OF HCI EXTRACTION ON CERTAIN MATALLIC CONTENTS EXTRACTED FROM ANIMAL TISSUES

TU CHENMEI, WEN YONGHXJANG

1983, 1(3):  279-282. 

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A simplified method of using 1N hydrochloric acid in extracting of animal tissue samples before being checked by atomic absorption and flame spectrometry has been tried and tested successfully. It oan be used specially in the determination of certain metailic contents, such as that of K, Na, Ca, Mg, Ou, Zn, Fe and Mn, in the animal tissues from pork, beef, chicken, fowl eggs, powdered fishes, powdered milk, and the blood of chicken.
The deta of there teats, in compared with that of conventional method of HNO₃-HClO₄, show a striking resemblances except for Fe. If an average relative deviation wich comes within 5% with absolute deviation within 0.05% are allowed, thss method may be suggested to put into practical use.