Table of Content

30 September 1989, Volume 7 Issue 3

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Articles

AN ELECTROSTATIC FIELD OF FOCUSING AND DEFLECTION IN THE SAME SPACE

WANG YANG, JIANG XIANGQI, HUA ZHONGYI

1989, 7(3):  189-193. 

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Until recently no electrode system can generate both electrostatic focusing field and deflecting field in the same space without any interference. Yet this can be done if some proper continuously varying potentials that satisfy two individual field requirements are applied on the boundaries of a closed structure. For instance, a new electrostatic quadrupole of square cross-section can be used as a focusing lens and for x-y deflection simultaneously. Preliminary results of the electron-optical experiment show that the proposed structure is correct.

THEORETICAL ANALYSIS AND CALCULATION OF BACKLASH FOR CENTER-ADJUSTABLE GEAR PAIR

ZHANG RONGXIN, GONG ZHENBANG

1989, 7(3):  194-200. 

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This paper introduced the mathematical model concerning gear ratios, strictly analyses the statistical characters of backlashes based on the stochastic process, theory, and then deduced the backlash calculation formulae for engineering designs and the parameters concerned:the coefficient of mean value, the coefficient of standard deviation, the coefficient of statistical value taken, and so on.

SIMULTANEOUS DETERMINATION OF SUBSTRATEOPTICAL CONSTANTS AND FILM PARAMETERSBY MULTIPLE ANGLE OF INCIDENCEEL LIPSOMETRY

ZHOU QINGCHU, XU NAIXIN, SHIH SHENGTAI

1989, 7(3):  201-206. 

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The dependence of the uniqueness in simultaneous determination of substrate optical parameters and film parameters by multiple angle of incidence ellipsometry on the correlation among these unknown parameters was discussed. A general guide to the selection of angle of incidence was proposed. The first derivatives of △ and ψ with respect to n_s, k_s, n_f, k_f, d and angle of incidence φ₀ were computed for Si-SiO₂ and stainless steel-passive film systems. The correlation among the unknown parameters was examined. A random simplex method was developed to obtain results for these two systems.

THE ACCURATE SOLVING PROCESS OF LINEAREQUATIONS AND ITS APPLICATION IN EXTREMUM OF FUNCTIONAL

ZHANG KECUN

1989, 7(3):  207-212. 

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In the process of engineering optimum, a group of special linear equations of order n have been obtained from the abstract mathematical model and the analytic expressions for the solutions have also been. derived. By means of the analytic expressions for the solutions, a new approach for solutions has been provided to a type of conditional extremum of functional. Noticeable achievements have been made with the application of this approach in optimum engineering designs.

SOLUTION OF THREE DIMENSIONAL ELECTROSTATIC PROBLEM BY BOUNDARY ELEMENT METHOD

WU WANCHUN, WEN GEYI, LIU XUEGUAN

1989, 7(3):  213-218. 

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A detail discussion for the solution of the three dimensional electrostatic problem by using the boundary element method is presented in this paper. The boundary element solutions for the capacitance of several isolated conductors are given. Results show that the method is quite effective, as it is precise and requires less computation time.

A NEW METHOD FOR CALCULATING THE NOISE PARAMETERS OF MESFET

CAI CHUNQING, CAI SHUZHEN, RUAN GANG, WANG JIANWEI

1989, 7(3):  219-224. 

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In this paper a new method for calculating the noise parameters of MESFET is presented. Using this method, noise parameters can be calculated not only from structure parameters or S parameters of MESFET separately, but also from the structurc parameters and S parameters simultaneously. This method possesses higher precision than those methods in common use. In this method noise parameters are calculated by using the rigorous network theory and lead inductances are included in the equivalent circuit of MESFET, so this method can be used up to a higher frequency range than Fukui's. Program MESNOC realizes these ideas. It is very useful for research and development of new device as only the nodes of the equivalent circuit and the values of the elements are required when unning MESNOC. The values of minimum noise figure calculated by using MESNOC agree with the values measured.

MAGNETOOPTIC SPECTRUM IN LPE FILMS OF BISMUTH SUBSTITUTED IRON GARNETS

WANG LIXUAN, ZHOU DIANQING, YIN BANGYONG, YI XIMEI

1989, 7(3):  225-230. 

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The growth technology of LPE is studied for the films of Bismuth substituted iron garnets. At the wavelengths between 0.40μm and 0.80μm,the saturated Faraday rotation spectrum and optical absorption spectrum have been obtained at room temperature for (Bi, Y, Lu)₃(Fe, Ga)₅O₁₂ LPE films with different Bismuth contents. Results indicate that in the vicinity of wavelength 0.5μm, there are the peaks of the rate of the specific Faraday rotation θ_F and optical absorption coefficient α, thus proving the existence of a strong magnetooptic active transition in this region. The microscopic causes of the transition are discussed.

THE STABILITY OF PHOTIC ANODE OF SINGLE CRYSTAL n-CdTe AND PHOTOPASSIVATION

YANG JUN, DENG XUNNAN

1989, 7(3):  231-235. 

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The stability of single crystal n-CdTe in aqueous solution and the photopassivation behaviour have been investigated. The changes of the surface composition and shape are examined by means of the solid surface analyses. The stability of n-CdTe photoelectrochemical cell is apparently improved by selecting the suitable redox couple or modifying the photoelectrode surface.

THE EFFECT OF SENSITIZERS ON IRRADIATION CROSSLINKING OF POLYVINYL CHLORIDE (PVC)USED AS WIRE AND CABLE

WANG MINGJUN, YIN MING, CHANG YUNZHI, ZHAO MINGLI, ZHANG SHIJIE, ZHANG HEKANG

1989, 7(3):  236-242. 

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Generally, pure PVC can not be irradiation crosslinked by electron beams or α-rays; crosslinking agents (or sensitizers) must be used in the irradiation crosslinking of PVC. The effect of the different sensitizers on irradiation crosslinking of PVC has been investigated. The kind of sensitizer and its content in PVC influence the thermal stability, mechanical properties and electrical properties of XLPVC. Experimental results show that TMPTMA is a better sensitizer for irradiation crosslinking of PVC. Also, the effect of different sensitizers on the relationship.between the sol fraction (S) and dose (R) is discussed. It is found that the logarithmic value of sol fraction (InS) is proportional to the sensitizer content in PVC.

THE SYNTHESIS AND ADSORPTION PROPERTIES OF MACRO-POROUS CHELATE RESIN PHNVA

CHEN XINGQI, WU YAOXUN, CAI XIAOPEI, BING QIANFAN

1989, 7(3):  243-249. 

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We have synthesized a new macro-porous Schiff-base chelate resin, which has never been reported in literature before. The name of the resin should be poly-N-(2-Hydroxy-Naphthmethylene) Vinyl Aniline. In this paper, it is simply written as PHNVA. The systhesis structure and chelating properties of PHNVA are studied. It is shown that trace copper ion (Cu²⁺)in the nickel electroplating solution and trace copper (Cu²⁺) in the effluent of acidic copper electroplating solution can be removed and (or) recovered with the resin.

STUDY ON THE SYNTHESES OF α-SUBSTITUTED POLYOLEFINE IMPROVED ROOM TEMPERATURE VULCANIZED SILICONE RUBBERS

ZHOU CAFHUA, WANG LIXIAO, LIN SICONG

1989, 7(3):  250-254. 

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The syntheses of grafted copolymers composed of α, ω-dihyroxyl-terminated dimethylpolysiloxanes and α-substituted polyolefines were reported. High strength room temperature vulcanized silicone rubbers were prepared and the relation ship between their structures and physical performances was studied.

A MÖSSBAUER SPECTROSCOPY STUDY OF THESTRUCTURAL PHASE TRANSITION OF BAINITICSPHEROIDAL GRAPHITE CAST IRON AFTER STRAIN

ZOU LUFAN, YAO KAILUN, ZHOU SUNXAN, SUN YAOQING, XIE ZHONGWEI

1989, 7(3):  255-259. 

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The structural phase transition of the bainitic spheroidal graphite cast iron is studied by Mössbauer spectroscopy. We find that the structural phase transition occurs after the applied s rain, that the more the strain, the more the transition of ehe retained austenite, and that the amount of decrease of the retained austenite is tqual to the amount of increase of bainite, which is about 6% for the strain of 9.8%. It seems that there exist two bainitic structures for the bainitic spheroidal graphite cast iron.

TECHNOLOGY OF REACTIVE ION BEAM ETCHING OF BLAZED GRATINGS

FU XINDING, FANG HONGLI, CHEN GUOMING, ZOU SHICHANG

1989, 7(3):  260-262. 

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The holographic blazed gratings have been microfabricated on a quartz substrate by using the relief grating mask and the reactive ion beam etching technique which has both the advantages of reactive ion beam etching and ion beam milling.
The diffraction efficiency of the first etched gratings is up to 75% with an area of 45×45mm² and a space frequency of 1200 lines/mm.

ADSORPTION OF SOME SURFACETANTS ON SURFACEOF-γ-Fe₂O₃ AND DISPERSIBILITY OF THE γ-Fe₂O₃ PARTICLES IN TOLUNE-BUTANONE

WANG PING, YU SHUHUA, GUO HONGYOU, HUANG YULI

1989, 7(3):  263-266. 

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The authors made a research on the dispersibilities of γ-Fe₂O₃ treated by three kinds of surfacetants. The characters of adsorption of the surfacetants are studied by thermogravimetry-differential thermal analysis. It is found that the temperature,enthalpy, and energy of activation of phase transition from γ-Fe₂O₃ to α-Fe₂O₃ distinctly change after desorption of different surfacetants from γ-Fe₂O₃. Thus this phenomenon can be used to judge between chemical and physical adsorption. We find that two kinds of surfacetants of chemical adsorption can improve the dispersibility of γ-Fe₂O₃ in toluene-butanone.

PROBE INTO POWER WINDOW OF CWAr⁺ LASER RECRYSTALLIZATION OF POLYSILICON

HUANG XINFAN, BAO XIMAO, CHEN JIAN, LIANG MEILONG

1989, 7(3):  267-270. 

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The poly-crystalline silicon films deposited on an insulating substrate by LPCVD are recrystallized by CWAr⁺ laser irradiation. According to the relations between the average crystal-grain size and the laser power, we can divide the recrystallizing process into three stages, called solid phase crystallization, liquid phase crystallization and saturated crystallization. There exists a power window restricted by the recrystallized grain size, the properties of the interface between the polysilicon and SiO₂ layer as well as the irradiation damages. In this paper we analyse the mechanism of the formation of the irradiation damage and propose to diverge the laser beam and increase the thickness of SiO₂ in order to widen the power window.

TWO-OPTICAL-PATH MEASUREMENT OF THE EQUILIBRIUM PRESSURE OVER COMPOUND AND ALLOY MELTS

ZHOU SHUQUAN, SANG WENBIN, XIE MIN, WU WENHAL

1989, 7(3):  271-274. 

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This paper presents the two-optical-path measurement, by means of which the partial pressures over the compounds and alloys at high temperatures and high pressures can be determined. Real time comparisons and digital display of results were adopted in the measuring system. The influences caused by varying the light source, environment, and other factors were found to be reduced.

THE APPLICATION OF DIGITAL FILTERING TECHNIQUE TO THREE-DIMENSIONAL SURFACE TOPOGRAPHY MEASUREMENT

LOU HUAZHOU, ZHANG E

1989, 7(3):  275-279. 

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The problem of the filtering technique for three-dimensional surface topography is dealt with in this paper. The frequency characteristic of the two-dimensional digital filter which is used to filter the three-dimensional surface topographic signal is analysed and derived. The corresponding high pass and low pass digital filters are designed. Finally, a grinding surface is measured and the topographic signal is filtered respectively with high pass and low pass filters.Thus,the three-dimensional roughness and waviness are obtained.

FABRICATING CLEAN CRYO-CONDENSED FILM

ZHANG KAIDA

1989, 7(3):  280-282. 

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Cryo-condensed films are thermal evaporated onto cool base plate in a small ultrahigh vacuum ampoule immersed in LHe. The tungsten filament evaporator is typically 0.2mm in diameter and the base temperature is about 10K. After the films have been made, their resistance-temperature relationship is measured in the original apparatus.
Using this method, we have fabricated clean cryo-condensed films.