Table of Content

31 March 1989, Volume 7 Issue 1

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Articles

OPTIMAL PERFORMANCE OF THREE-HEAT-SOURCEHEAT PUMP

YAN ZIJUN, CHEN JINCAN

1989, 7(1):  1-6. 

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In this paper, we investigate a class of three-heat-source heat pumps, in which the only irreversible process is heat conduction. It is shown that the endoreversible three-heat-source heat pump is the most optimal one. Moreover,the relation between the optimal coefficient of performance and the rate of heating is induced. Thus the fundamental effect of thermal resistance on the optimal performance of a three-heat-source heat pump is expounded.The conclusions in this paper are more realistic than those in classical thermodynamics.

ANALYSIS OF THE PROPAGATION CHARACTERISTICS FOR FINLINES WITH NARROW SLOTWIDTHS ANDTHICK FINS

XU SHANJIA

1989, 7(1):  7-12. 

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In this paper, we present an analytical method of the propagation characteristics for the finlines with extremely narrow slotwidths, the effect of fin thickness being taken into account also. The dispersion and impedance characteristics are calculated by the present method for the unilateral and bilateral finlines. The numerical analyses show that the method avoids the convergence problems mob with in computing the finlines with extremely narrow slotwidth by other numerical techniques, and justify that this method possesses the advantages of rapidity, effectiveness and simplicity.

EXPERIMENTAL MEASUREMENT OF ELECTRICALPROPERTIES OF A NEW POLAR CRYSTAL——TRIS(HYTROXYMETHYL) AMINOMETHANE (TAM)

SHI ZIKANG, LI ZHENGDONG, SU GANBO

1989, 7(1):  13-18. 

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We systematically investigated the electrical properties of the tris (hydroxymethyl) aminomethane crystal, a new type of pyroelectric crystal material. The properties studied are the dielectric constant, AC-and DC-resistivity, loss angle, and the phase transition character in the orientation of non-polar axes as well as transparence. The p/ε₀ is about 10^-10. It may be expected that it would be useful in the application to infrared pyroelectric detectors.

A RECURSIVE OPTIMAL (LSE) ALGORITHM OF DECONVOLUTION

HUANG ZHONGPING, NI CHONGKUANG, XIE YUN

1989, 7(1):  19-24. 

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Extracting the reflection coefficients of layers from seismic signals is important to the lithologic analysis and the success rate of drilling in finding the oil-gas-bearing structure. In this paper, an algorithm of deconvolution for the extraction of reflection coefficients is presented. The estimator got from this algorithm has the smallest variance of error among all linear estimators of reflection coefficients. The algorithm requires only a few computations and memory cells because of its recursive, in-place computation. Results of simulation indicate that, if the NSE (noise-to-signal ratio)is less than 30%, the algorithm is better in precision than Levinson's algorithm; if the NSR condition is worse, the two algorithms approximately have the same error curve.

THEORETICAL AND EXPERIMENTAL INVESTIGATION ON SLOW WAVE TYPE MICROWAVE SENSOR

YAN XIAOHONG, ZHANG ZHAOTANG

1989, 7(1):  25-29. 

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The Karp type slow wave structure loaded with dielectric is described in theory, and a general dispersion equation is obtained.The effect of the dimensions of Karp structure and the effect of the permittivity of the loaded dielectric on dispersion characteristics are calculated by computer. The results thus obtained show the significance of Karp structure as a slow wave type moisture content sensor.
As is proved by theory and experiment, this type of microwave sensor has special advantages and will come into use in the microwave measurement technique of nonelectric quantities.

INVERSE SCATTERING FOR STRATIFIED ANISOTROPICDIELECTRIC

CHEN XIAOAN, ZHANG WENXUN

1989, 7(1):  30-34. 

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The problem of inverse scattering for stratified anisotropic dielectric is investigated in this paper. The reconstruction of permittivity tensor for both stratified-homogeneous and stratified-inhomogeneous anisotropic lossless and lossy dielectric is studied. The method to determine the orientation of the principal dielectric axis and the principal permittivities is provided.

Hg 6¹P₁ EXCITED STATE DENSITIES AND 185.0 nm SURFACE IRRADIANCES IN Ar-Hg DISCHARGE COLUMNS

ZHU SHAOLONG, ZHENG LI, CAI ZUQUAK

1989, 7(1):  35-40. 

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A spectral line absorption method was used to determine the Hg 6¹P₁ excited state densities in low pressure mercury vapour discharge columns of various diameters. Two spectral lines, 576.96nm (transition between 6³D2 and 6¹P₁) and 579.07nm (transition between 6¹D₂ and 6¹P₁), were separately chosen for the measurements. The results obtained were in good agreement. From, the 6¹P₁ state density data, we calculated the 185.0nm irradiance on the inner surface of various fluorescent lamps, using the resonance radiation imprisonment theory. It was concluded that the irradiance on the inner surface of the newly developed compact fluorescent lamps was one order larger than that of conventional fluorescent lamps, which seggested that highly stable phosphors to 185.0nm radiation or some method to re-duce the 185.0nm irradiance on phosphors was preferable in those new lamps.

MEASUREMENT OF INTERNAL STRESSES OF THREE DIMENSIONS IN RUBY SINGLE CRYSTALS

LI LIQUAN, FAN DEPEI, QIU DIRONG

1989, 7(1):  41-46. 

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Internal strains in eight different directions in ruby single crystals are measured from the reflection pseudo-Kossel pattern. By solving the corresponding average strain and stress tensors, the internal stresses of three dimensions in the crystals can be calculated. Since internal stress is an important parameter for appraising the quality of rudy, the method mentioned above is recommendable.

TANTALUM BOAT USED AS SOURCE HEATER INVACUUM EVAPORATION OF PURE METALALLOYS AND SILICIDE FOR LSI

ZHANG YIPING, XU YUANSEN

1989, 7(1):  47-51. 

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The pure tantalum boat used as a source heater for vacuum evaporation of pure Al, Cr, Si, Ti, Al-Si and TiSi₂ films is developed. This resistor heater method is attractive because it is simple and inexpensive, there is no ionization radiation and no mobile ion contamination from the heater, and the composition and properties can be controlled. Now this method is incorporated in our LSI development.

THE ELECTRICAL CHARACTERISTICS OF GaAs-SiO INTERFACE FABRICATED RY LOW TEMPERATURE PROCESS

SHENG CHI, REN YUNZHU

1989, 7(1):  52-56. 

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A low-temperature process for producing the GaAs MIS structure based on the slow evaporation of powder SiO on the room-temperature GaAs substrate is developed. The as-grown GaAs-SiO MIS has a low interface state density of 8×10¹¹/cm²·eV and a low hysteresis. No frequency dispersion of the accumulation capacitance is found, as explained by the frequency-dependent permittivity of SiO.

ENHANCED ANNEALING EFFECT OF DOUBLE ION IMPLANTED Si-SUBSTRATE

ZHU JINLIANG, CHENG DONGFANG, WANG LIANG, CAI RENKANG

1989, 7(1):  57-60. 

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The enhanced annealing effect resulting from argon and boron implantation in silicon is described. The small sheet resistance value is obtained by the four-probe measurement at about 500℃. It is observed by SEM and Raman spectroscopy that the radiation damages of crystalline lattices are well recovered.

THE MEASUREMENT OF SPECIFIC CONTACTRESISTANCE OF M-S BY PROBE HEADSOF THE IN-LINE FOUR PROBES

CHEN CUNLI, HUA WENYU

1989, 7(1):  61-64. 

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In this paper, a simple method to measure the specific contact resistance of metal-semiconductor ohmic contact is developed, using the probe heads of the inline four probes. The equations to measure the specific contact resistance for a thin semiconductor layer have been derived. The experimental results are in good agreement with the in-line geometry transmission line model.

PbO₂/MnO₂ SEMICONDUCTING THIN FILM TECHNOLOGY AND ITS ESCA/AES STUDY

YU ZHIZHONG, HU NANSHAN, CAI BINGCHU

1989, 7(1):  65-70. 

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The PbO₂/MnO₂ semiconducting thin film is deposited by RF bias sputtering, doping PbO₂ with MnO₂. This film, on account of its good properties at high and low temperatures, can be used to fabricate large capacity film capacitor TLMM. The MnO₂ thin film, which can be employed to manufacture the multiplier phototube, is sputter-deposited directly from powder MnO₂, its composition and chemical aspect approaching standard MnO₂. ESCA and AES techniques are used to monitor the ratio of PbO₂/MnO₂ and the composition of manganese oxide of the semiconducting thin film. In this way, the sputtering parameters are determined.

STUDY AND DESIGN OF CMOS SMOKE DETECTOR CIRCUIT

CHEN SHILING

1989, 7(1):  71-74. 

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This paper presents the principles and main units design of the CMOS smoke detector IC, which we have researched on and fabricated. The IC main features are:the detector input impedance is high, the internally set detector threshold can be regulated via the external resistor, the output guard on each side of the detector input can prevent false triggering, and a piezoelectric horn and a LED driver are provided.

THE STUDY OF Fe₃O₄ COATED WITH SINGLE LAYER MOLECULAR OLEIC ACID

ZENG HUANXING, ZHOU WENYUN

1989, 7(1):  75-80. 

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In this paper, the ultra-fine particles of Fe₃O₄ coated with a single layer of molecular oleic acid were prepared by the neutralizing co-precipitation solution-adsorption process. The particle size, shape and structure of Fe₃O₄·nOA wore primarily studied by electron microscopy, infrared spectroscopy, DTA-TG, X-ray diffraction, etc. Some of the methods of calculation and measurement of the particle size and quantity of oleic acid in Fe₃O₄·nOA were provided by testing and supposition.

A STUDY ON APPEARANCE POTENTIAL SPECTROSCOPY IN EVAPORABLE GETTERS

SHAO LIWEI, LIU JIEME, LOU WEIHONG, CHEN DESEN, HU SIAN

1989, 7(1):  81-85. 

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Using AEAPS and EPAPS-AEAPS compound analysis technique, the analysis of surface component for the evaporable getter is introduced. The surface states of different qualities of evaporable getters are compared and impurities in getters are studied, introducing a principal construction and a detective graphic. It is very useful in applying the appearance potential spectroscopy to getter production.

EFFECT OF COPOLYMER OF VINYL CHLORIDE-VINYLACETATE-VINYL ALCOHOL ON ADHESION OFINTERFACES IN MAGNETIC COATING

WANG PING, HUANG YULI, QIU ZHAOYAO, NIU AIJIE, LI ZONG

1989, 7(1):  86-90. 

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The effect of two kinds of copolymer of vinyl chloride-vinyl acetate-vinyl alcohol, which are different in molecular weight, on the dispersibility of γ-Fe₂O₃ particles in butanone and on the adhesive tension between γ-Fe₂O₃ and the copolymer and on the peel strength between the copolymer and the polyester film are studied. The above-mentioned properties are improved when the molecular weight of the copolymer is 3.4×10⁴ as proved by both experiment and theory.

A MODEL OF STRAIN CENTERS AND STRAIN COMPENSATION FOR DEVICE PASSIVATION

LI DANZHI

1989, 7(1):  91-94. 

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Based on the infrared strain distribution photo taken and the shape of spots on the Si wafer after thermal oxidation, this paper presents a model of strain conters. The model brings to light the minority carrier life dependence on strain centers and explains the improvement of transistor current gain due to the strain compensation of the double layer dielectric films.