Table of Content

30 September 1993, Volume 11 Issue 3

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Articles

TRENDS OF THE DEVELOPMENT OF ELECTRONICS TECHNOLOGICAL REVOLUTION IN THE TRANSCENTURY PERIOD

LUO PEILIN

1993, 11(3):  189-198. 

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The status and trends of the development of the ELECTEONICS TECHNOLOGICAL EEVOLUTION in the trans-century period are depicted. The ever culminating fast trend towards great concentration, integration, distribution and pervasion is most prominent, and the ADVANCED (ELECTRONICS) CULTURE INFORMATION TECHNICAL SYSTEM is completing its process of integration into the entirety. This is indeed another great technological revolution since the appearance of the printing machine during the Renaissance, but far more penetrating, pervasive and sophisticated. This very trend is illustrated by examples of automation in contemporary industrial practice, in the advance in tele-communication and in the Gulf War. As a consequence, the author asserts that it is a great technological revolution in both material civilization and spiritual civilization spheres.
In the development, microelectronics and microfabrication are now attaining new height of the state of the art. "Hard" and "soft" basic elements necessary for the development of electronics are being given imperative priority. Processes, materials, man-machine interface and computer aids to every facet are stressed.It may therefore be said that electronics is currently reaching the adulthood.Numerous contemporary achievements and subjects of the development are mentioned.

MILLIMETER-WAVE RADAR TECHNIQUE FOR MEASURING CHARGE LEVEL IN BLAST FURNACES

DING YIYUAN

1993, 11(3):  199-205. 

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The paper describes a new millimeter-wave real-time three dimensional FMCW imaging radar system used to obtain the image of charge level in the blast furnace. The imaging principle, design idea and characteristics of the radar system are expounded, and some successful results of system testing on a simulation blast furnace are presented. This technique is the first ever applied to the testing of the charge level in blast furnaces at home and abroad.

STUDY ON FUZZY RECOGNITION AND FUZZY OPERATING NETWORK ALGORITHM

ZHENG DELING, XIONG QIANG

1993, 11(3):  206-212. 

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In this paper, we present a fuzzy recognition method; the original fuzzy set is expressed in the distributed fuzzy sets. A new mechanism for knowledgerepresentation and inference——the fuzzy operating network——is proposed. Itcan be used to represent fuzzy knowledge conveniently and to process knowledge rapidly. The result in the intelligent control is very satisfactory.

THE ELECTROMAGNETIC SIMILITUDE OF THE OBJECT CONTAINING LOSSY MATERIALS AND THE RCS SCALED-DOWN RELATIONSHIPS OF THE COATED PLATE

ZENG XUEGANG, LIN WEIGAN, EUAN CHENGLI

1993, 11(3):  213-218. 

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The electromagnetic similitude conditions of the object containing lossy materials and the scaled-down relationships of the variables considered are derived in this paper. As an example, the RCS scaled-down relationship of a coated plate is studied here.

PARALLEL PROCESSING IN THE SIMULATION OF COMMUNICATION NETWORKS

ZHU TAO, CHENG SHIXING

1993, 11(3):  219-225. 

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Parallel simulation is a practical technique to boost up the efficiency of simulation. The probability to apply this technique to the simulation of communication network is discussed in this paper. A centralized asynchronous scheme of parallel simulation on communication under the Transputer/OCCAM environment is presented, the control mechanism and working flow chart are given in detail, and methods to analyse the performance of parallel simulation are discussed.

THE STUDY ON A 150 MHz INTELLIGENT REFLECTION SCANNING ACOUSTIC MICROSCOPE AND ITS IMAGE PROCESSING FUNCTION

CHEN GELIN, HU SIZHENG, LUO SHUYUN, ZHANG KEQIAN, SHEN ZHONGMING, XU ZHENGYTIAN

1993, 11(3):  226-234. 

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Tne intelligent 150 MHz SAM is described in this paper. A current microcomputer is used as the central control part, the image being displayed on the terminal. The instrument has a high resolution on the surface and in the deep region of a structure, thus a structure of 20μm lateral dimension located at 5.1 mm from the surface can be observed. The microscope also possesses the function of image processing and of analysing specimen parameters. These facts show that the microscope is of practical value.

THE STUDY ON FUNCTIONAL DIFFERENTIAL EQUATIONS IN HIGH SPEED MECHANISMS

ZHANG OHANGBO, YU YUANHONG

1993, 11(3):  235-240. 

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In this paper we consider the functional differential equations of second order
(r(t)x'(t))'+a(t)x^a(t-τ(t))=f(t) (A)
where 0 < α < 1 and α is a ratio of odd integers. The equations have extensive applications to high speed mechanisms. Several sufficient conditions have been found to ensure that all oscillatory solutions of (A) approach zero asymptotically.

KNOWLEDGE REPRESENTATION BASED ON FUZZY SET THEORY AND NEW PLAUSIBLE INFERENCE ALGORITHMS PMLIFS-I AND PMLIFS-Ⅱ

WANG SHITONG

1993, 11(3):  241-247. 

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In this paper, the knowledge representation based on the fuzzy set theory is investigated, and a new plausible inference algorithm PMLIFS-I is presented. Then in terms of the new concept of λ-composition, the improved algorithm PMLIFS-Ⅱ of algorithm PMLIFS-I is presented. Both algorithms are useful and significant.

TEMPERATURE DEPENDENCE OF THE EFFECTIVE DOPING DISTRIBUTION IN THE EMITTER OF BIPOLAR TRANSISTORS

ZHENG JIANG, WANG YAN, HUANG QIN, WU JIN, WEI TONGLI

1993, 11(3):  248-252. 

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In this paper, the relation between the effective doping distribution N_Eeff and the doping concentration N_E in the emitter of silicon bipolar transistors at different temperatures is studied theoretically. The results indicate that N_Eeff increases as N_E rises at room and high temperatures; however, N_Eeff will decrease as N_E rises at low temperatures; and N_Eeff shows no relation to N_E at a particular temperature. These results will provide the design foundation of bipolar transistors for low temperature operation.

THERMAL STABILITY OF SIMULTANEOUSLY FORMED TiN_xO_y/TiSi₂ FOR SHALLOW JUNCTION DEVICE APPLICATIONS

CHEN CUNLI, SONG HAIZHI, HUA WENYU

1993, 11(3):  253-257. 

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A TiN_xO_y/TiSi₂ bilayer structure is formed simultaneously for Ti film on Si by rapid thermal annealing at 900℃ for 15s in highly pure NH₃. The effectiveness of TiN_xO_y as a diffusion barrier layer for Al has been studied. Eesults show that the Al/TiN_xO_y/TiSi₂/Si contact system has good thermal stability, when Bintered in N₂, up to 550℃ for 30min.

NUCLEATION AND GROWTH MECHANISMS OF DIAMOND FILM ON SILICON SUBSTRATE

TU YUQIANG, XIA YIBEN, WANG HONG

1993, 11(3):  258-264. 

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Diamond crystallites have been grown on silicon substrates of different surface conditions by hot-filament method using alcohol. The nuoleation and growth mechanisms of the diamond film have been discussed. CH₃ is considered to be the main gas species of diamond nucleation; hydrogen atoms play an important role in nucleation and growth; and it is easier for diamond to nucleate on a silicon substrate of comparatively rough surface than on the one of a glossy surface.

DESIGN OF THE MAGNETIC DEVICE FOR NUCLEAR MAGNETIC RESONANCE IMAGING INSTRUMENT USED IN MEDICINE

SHI TAIHUA, XU SHUJUN, LU YUQING

1993, 11(3):  265-270. 

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The magnetic device is the key part of the nuclear magnetic resonance imaging instrument (NMR-CT). We designed this device by computer aided design and then constructed the imitative device. Experiments show that the difference between the calculation and measurement is only 5.1%, and the field homogeneity is about 2088×10^-6.

OPTICAL PROPERTIES OF GRANULAR Sn FILMS WITH Al COATING

WU GUANGMING, QIAN ZHENGXING

1993, 11(3):  271-276. 

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The optical properties of the granular Sn films coated with Al films are studied. The experimental results indicate that the Al coating strongly affects the optical properties of the granular Sn films, enhancing the spectrum selectivity of solar energy in the visible region and the reflectance near the IR region. The filling factor Q of granular Sn films obviously influences the optical properties of the films system. Based on the installed structure model and the Maxwell-Garnett theory, the reflective spectra are calculated. The calculated results agree with the experimental cnes. It is also found that the Al coated granular Sn films have various kinds of reflective colors, thus they may be used as decorative mirrors for many purposes.

DYNAMIC STUDIES FOR ADSORPTION AND DESORPTION OF(C₂H₅)₂NH ON DIFFERENT ZEOLITES BY TPD

DUAN XUE, ZHU YALING, WANG ZHOUXIN

1993, 11(3):  277-282. 

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In this paper, the adsorption and desorption of (C₂H₅)₂NH, as a cross linked agent, on different zeolites are studied by temperature programmed desorption (TPD). It is shown that (C₂H₃)₂NH can be strongly adsorbed on the surface of the zeolites and the capabilities of the adsorption are different when the acid characteristics on the surface of the zeolites are different. The effective sites of adsorption for the cross linked agent, are the sites of weak chemical adsorption. By kinetic calculation, it is found that there is a crystal diffusion in the desorption and the apparent activation energies of the desorption are 75.4kJ/mol(for5A), 51.5kJ/mol(for 13X), 23.2kJ/mol(for a nature zeolites), 35.6kJ/mol(for NaY) and 56.9kJ/mol(for ZSM-5).