Table of Content

30 June 1984, Volume 2 Issue 2

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Articles

ON THE ORIGIN AND OUTLOOK OF TECHNOLOGICAL REVOLUTIONS

HOFF LU

1984, 2(2):  95-105. 

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A brief historical review of technological revolutions and inventive innovations in the industrial science is given, leading to the realization that the inventions and developments of sream engines, internal combustion engines and electric motors and generators in a period of decades spanning the eighteenth and nineteenth centuries truly constituted the past industrial revolution and that the current development of micro-computer controlled modern robots may be anticipated to give rise to a future industiral revolution in the tirst few decades of the coming century. Special emphasis is laid on the indispensable role played by basic experimental and theoretical scientific research which has led to epoch-making inventions and discoveries. It is pointed out and illustrated that recent history of industiral science has shown that adequate system of organizational structure and proper selection of scientific and administrative per-sonel will make possible spectacular progress exceeding records of predecessors. Finally, rudimentary remarks are made regarding our understanding and synthesis of the rapidly evolving controversies in technological knowledge.

NUMERICAL SIMULATION OF TWO-DIMENSIONAL, TWO-PHASE STEFAN PROBLEMS

XIN XIAOKANG, E. VAROGLU

1984, 2(2):  106-120. 

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Using the method of line and the variable domain finite element method, the numerical simulation of 2-D., two-phase Stefan problems has been carried out successfully. The advantage of the method is that two boundary conditions on the moving boundary are simultaneously satisfied. Honce, it has a higher precision even for the coarse meshes.
A melting problem of a square ice will be as a typical calculating example. For the different parameters (the thermal diffusivity, the latent heat of melting etc.and two types of the boundary condition, the numerical results of the temperature distribution and the position of the interface have been obtained. For the degenerated one-phase case, our results are compared with Meyer's results[7]. The agreement is quite good.

NUMERICAL SOLUTION OF MULTIMEDIUM FLOW WITH VARIOUS DISCONTINUITIES

WU XIONGHUA, ZHU YOULAN

1984, 2(2):  121-129. 

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Because the equations of state are different, many difficulties will occur when we treat multimedium flow with general difference methods. Such problem has been successfully solved with the singularity-separating method. The main idea of the method is that we take all discontinuity lines, including the boundary lines between two mediums, as internal boundaries. A mixed scheme is used in each subregion. The values on the boundaries can be precisely determined. Not only can the difficulties caused by multimedium be overcome, but also the precision of the solution is high.

DESIGN OF MICROWAVE DIELECTRIC RESONATOR AND ITS APPLICATION IN X BAND FREQUENCY-STABILIZEDSOLID STATE OSCILLATORS

TANG PENGQIAN

1984, 2(2):  130-139. 

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A practical method for designing microwave dielectric resonator is proposed. It can conveniently be used with sufficiently high accuracy for engineering applications (calculated resonate frequency error is less than ±1.5%).
A compact, low cost, highly stabilized 11.48 GⅡz Gunn oscillator using one kind of China-made dielectric resonator is described in detail. The frequency drift is less than ±0.45 MHz for a-20-+50℃ temperature range, better than that of a stabilized Gunn oseillator using conventional bulky and high cost Invar cavity. This oscillator can widely be used as a local oscillator in 12 GHz home TV receiver for satellite-relayed programs.

THE CALIBRATION OF BINDING ENERGIES AND THE DETERMINATION OF ATOMIC SENSITIVITY FACTORS FOR THE X-RAY PHOTOELECTRON SPECTROMETER

YU MINGREN, PANG YANWAN, CHENG SHINING, WANG XUN

1984, 2(2):  140-149. 

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The binding energy zero of an X-ray photoelectron spectrometer has been calibrated by the XPS signal of nickel 3d valence band, and the binding energy scale between 84 and 932 eV has been checked by the XPS peaks of gold and copper. In deing so the core level binding energies of several metals could be determined precisely. The CIS peak shift of adventitious carbon on metal surfaces to a value of leV has been found which might be attributed to the existence of different chemical states of carbon. By measuring the XPS intensities of some pure netil samples and using the theoretical values of photoionization cross section and escape depth, we obtained an apparent transmission function for our spectrometer, from which the relative atomic sensitivity factors of various elements could he derived. The results of our experimental measurements on several compound samples have shown that the accuracy within 20% could be reached by using these atomic sensitivity factors, which is much better than that obtained by using the theoretically calculated sensitivity factors onto our spectrometer. Although all of the above mentioned experiments have been done on an ESCALAB 5 type electron spectrometer, the same approach is supposed to be applicable to other typa XPS machines.

A STRUCTURAL MODEL OF THE DILUTE LIQUID SODIUM AMALGAM

KUO CHUKUN, SUN CHENGWEN

1984, 2(2):  150-154. 

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The podium activity and its composition and temperature dependences can be satisfactorily accounted for by a structural model of the melt for the compositions of x=0.00002-0.02568 in Na_xHg_1-x and in the temperature interval 303. 15 K-383. 15 K. The calculation of tentative equilibria suggests that the structural species in the liquid amalgam of low sodium content may possibly be dominated by the following chemical equilibrium.

THE COHERENT RADIATION POWER CHARACTERISTIC OF JOSEPHSON ARRAY UNDER CAVITY COUPLING

ZHU YUN, NI GUONGJIONG

1984, 2(2):  155-161. 

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On the previous Work[1]. We have researched microscopically the coherent radiation power characteristic of Josephson array under cavity coupling taking into account the dissipative effect in the presentation of Anderson's quasispin. The results have been compared with those of "RSJ" Model.

FUNCTIONAL TESTING FOR MICROPROCESSORS

MIN YINGHUA, S. Y. H. SU

1984, 2(2):  162-169. 

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Three proceduces for testing register decoding, instruction decoding, data transfer, data storage and data manipulation function faults in microprocessors are described step-by-step in this paper. Each procedure is used for testing several types, instead of one type, of functional faults to simplify the testing. In addition, WRITE and READ decoding faults are tested separately, the proceduees presented in this paper thus have high fault coverage and efficiency.

TRANSMISSION INTERFERENCE METHOD FOR MEASURING THE THICKNESS OF THIN SOS FILMS

CAI XIJIE, CHEN QINGGUI, SHI RIHUA, WANG QIMIN

1984, 2(2):  170-174. 

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By appling the principle of optical transmission interference, a method for measuring the thickness of SOS films in submicron range has been proposed. After comparing it with the methods of reflection interference in different wavelength range and of direct determining the thickness by SEM, it is concluded that this transmission method for measuring thin thickness of SOS films is more simple and applicable than reflection interference method, however, both accuracies are the same.

A THEOREM OF LIAPUNOV STABILITY WITH EQUALITY AND INEQUALITY CONSTRAINTS

GUO QIANRONG

1984, 2(2):  175-177. 

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A theorem of Liapunov stability with equality and inequality constraints is established for practical application.

THE PREPARATION OF HIGH ACTIVITY ALKALIN PHOSPHATASE FROM CALF INTESTINAL MUCOSE

JIANG YIZHONG, QIOU YAOJIU, YANG YANZHONG, QUO CHUNXIANG

1984, 2(2):  178-183. 

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This paper presents a method for the preparation of alkaline phosphatase (EC 3.1.3.1) from calf intestinal mueose. The method involves extraction of the mucose with butanol, fractionation with acetone and then (NH₄)₂SO₄, DEAE-cellulose ion-exchange column chromatography and Sephadex-gel filtration. The specific activity of the enzyme preparation was about 845 units mg of protein. The recovery of activity was 29%. Only one activity band was shown by the polyacrylamide gel electrophoresis.

MAGNETO-OPTIC SINGLE CRYSTAL FILMS OF (BiTm)₃ (FeGa)₅O₁₂

LIU XIANGIN, WANG HONGXIANG, RUAN YUANJI

1984, 2(2):  184-188. 

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Liquid phase epitaxy and magneto-optic properties of the films of (BiTm)₃(FeGa)₅O₁₅ are described in this paper. The influence of epitaxy on the growth rate and the magneto-optic properties of the films was studied. The high magneto-optic figure of merit, θ_F/α, of 2.9 deg dB has been obtained. The magnetic domain structures and the defects of the films were observed. We have conducted an experiment of modulation for low frequency on the magneto-optic modulator with fairly good results.