Table of Content

31 December 1987, Volume 5 Issue 4

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Articles

BRILLOUIN SCATTERING ON AMORPHOUS COPOLYMER PMA_0.1PMMA_0.9

WANG WEIGUO

1987, 5(4):  283-286. 

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Brillouin spectra in the wave number region between _0.110-0.510 cm^-1 are obtained and studied for the amorphous copolymer PMA_0.1PMMA_0.9 at the temperature between 15~170℃.The PMA_0.1PMMA_0.9 has glass transition temperature T_g=87℃.

AN INTERMODULATION LINEARIZER FOR SATELLITES

YAN FANG, CHEN JIANRONG

1987, 5(4):  287-294. 

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In this paper, analytical formulas of amplitude-phase characteristic for orthogonal-composition intermodulation linearizers installed on satellites are derived, and a linearizer is developed according to these formulas.
Performance testing of the device shows its ability of depressing mtermodulation products and verifies the theory to be in agreement with the experiment data.

THE APPLICATION OF THE NATURAL RADIOTRACER Ⅱ.A Stedy of Transportation of Silts Entering the Sea from Jiulong River and the Effect of Silts on the Principal Channel in Xiamen Habour Using ²²⁶Ra Tracer

CHEN JINXING, ZHANG PINGQING, LIN SHAOMENG

1987, 5(4):  295-300. 

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By determining the horizontal distribution of ²²⁶Ra in sediments of Xiamen Sea Area, it is found that the most silts from Jiulong River move to the offshore area along the main current direction of Jiulong River through the outside Xiamen Harbour and only a very small part of the silts enter the west Xiamen Harbour (i. e. the principal channel) with the residual current. The greater part of the silts do not enter the east-section of the west harbour but stop in the west-section of the harbour. This has effects on the channel of the west-section, not on that of the east -section. The results are in agreement with those obtained in other ways.

SOME LIMIT PROPERTIES OF EXCESS LIFE

MI JIE

1987, 5(4):  301-307. 

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The paper is devoted to the study of excess life in renewal process. It is proved in the paper that the excess life γ(t) and γ(t+s) at time t and t+s respectively are asymptotically independent. And it is also shown that the mixed moment Eγ^m(t) γⁿ(t+s) equals asymptotically to the product of the limits lim_t→∞ Eγ^m(t) and lim_t→∞ Eγⁿ(s).

ON QUASI-PERFECT PROPERTY OF DOUBLE-ERROR-CORRECTING GOPPA CODES AND THEIR COMPLETE DECODING

FENG GUILIANG

1987, 5(4):  308-316. 

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In this paper, we prove that the binary Goppa codes with L=GF(2^m) and G(z)=z²+az+b are quasi-perfect unless m is even and S₁=0,S₃=a^-1. When m is even, there is not any vector of weight <3 having syndrome S₁=0 and S₃=a^-1 but there is at least a vector of weight 4 having syndrome S₁=0 and S₃=a^-1. At the same time we give also a complete decoding of the binary Goppa codes with L=GF(2^m) and G(z)=z²+az+b.

THE MATHEMATICAL DISCUSSION ON THE ESTIMATION OF THE STABILITY THRESHOLD SPEED OF FLEXIBLE ROTOR SYSTEMS IN FLUID-FILM BEARINGS

ZHANG WEN

1987, 5(4):  317-322. 

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The paper is devoted to the discussion of the stability threshold speed of flexible rotor sys tems in fluid-film bearings. It is proved theoretically that the stability threshold speed of a general rotor system is always higher than the threshold speed of the corresponding equivalent single disk rotor. The conclusion offers us a simple approach to estimate the threshold speed of an actural rotor system and provide a theoretical foundation for the approach.

SURFACE AND INTERFACE STUDY OF ANODIC OXIDE ON InP BY AES

JIANG CHANGGEN

1987, 5(4):  323-328. 

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Auger line shape and energy shifts were used to analyze the surface and interface anodic oxides on InP. The composition and bonding of oxides grown in pH=2.6 and pH=6 3% tartaric acid-propylene glyool electrolytes were investigated. Plots of P (LMM) and In (M_4,5N_4,5) Auger line shape and energy shifts provide very useful information in distinguishing between In-0 and In-P or P-0 and P-In bondings. The outer layer of oxides consists of a mixture of In₂O₃ and P₂O₅ Both In -0 and P-O bondings penetrate into the same depth and there is no enrichment of element P on the interface, which is different from thermal oxide on InP. There is no sharp interface between anodic oxide and the InP substract. The method for determining the interface region and initial oxidic processes were discussed.

COUPLED-MODE THEORY FOR LP-MODE AND ITS APPLICATIONS

HUANG WEIPING, QIAN JINGREN

1987, 5(4):  329-336. 

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A new definition for LP modes is introduced. The orthogonality of the LP-modes in sense of power is discussed. Based on these, a set of coupled-LP-mode equations are derived. It is found that the coupling among the LP-modes consists of two parts:1. The residual coupling resulted from variation of dielectric across the cross-section and anisotropy of the reference fiber; 2. The intrinsic coupling due to the difference between the practical and the reference fibers. Then the coupled-LP-mode equations are transformed into the coupled-ideal-mode equations. With the transformations, it is easy to express the ideal modes (i. e. eigen modes of the reference fiber) in terms of LP modes or vice versa. Thus the errors arising from simply replacing the ideal modes by the corresponding LP modes are studied and the conditions in which the replacement is permissible are obtained.

WEIGHTING FUNCTION FOR COLLIMATION CORRECTION IN SMALL-ANGLE X-RAY SCATTERING

GUO CHANGLIN, YAO GONGDA, LU CHANGWEI

1987, 5(4):  337-345. 

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Generally, the collimation correction must be made on almost all the measured data of small-angle X-ray scatterings. This requires to first employ either theoretical calculation or experimental determination in obtaining the weighting unctions of the instrument. Due to conceptional confusions, contradictions and fproblems are found to exist in methods of determination of the weighting functions suggested in the current literature.In accordance with the basic theory of collimation correction, the physical meaning of the weighting functions and the method of determination are expounded and discussed. As a practical example, a determination of the weighting functions of different small-angle scattering instruments has been made.

CRYSTAL DATA FOR K₅Bi_1-xEr_x(Mo_O4)₄ SOLID-SOLUTIONS

LLU JLANCHENG, ZHANG LONGSHENG

1987, 5(4):  346-350. 

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The X-ray powder diffraction patterns of K₅Bi_1-xEr_x (MoO₄)₄ with x=0, 0.1, 0.3, 0.5, 0.7, 0.9, 1.0 are obtained by a counter diffractmeter and a Debye-Scherrer camera using Cu Ka radiation. KaBi_1-xEr_x (MoO₄)₄ (x=0-l) are solid-solutions in all composition range of x. They belong to the trigonal system with a space of R3m,Z=1.5. Cell parameters of K₅Bi_0.9Er_0.1MoO₄)₄ are a=0.6020nm, c=2.0740nm.

THE ELECTRON PAIR QUANTUM THEORY OF FREE ELECTRON STIMULATED EMISSION

YE LUNYAN

1987, 5(4):  351-357. 

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This paper suggests that the free electron stimulated emission originates from the quantum transition of the electron pair. The author has calculated the transition probability of the electron pair and has given condition of generation of the free electron stimulated emission.

EFFECT OF ELECTRODE MATERIALS ON V-I CHARACTERISTICS OF EVAPORATED FILMS OF COPPER PHTHALOCYANINE

SHI ZURONG, ZHANG JINGWEN, CAI ZHONGFU, HUANG WBIQITJ, QIAN RENYUAN

1987, 5(4):  358-362. 

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The effect of electrode materials on the V-I characteristics of evaporated film of copper phthalooyanine (PcCu) has been studied. The electrode materials used were Au, Ag, Cu, Al and SnO₂, In₂O₃. If the top and bottom electrodes are made of the same metal-Au, Ag, Ou, the dark currents are symmetric with respect to the change of polarity of the applied voltage to the electrodes, and the V-I characteristics are typical of the SOLO type. The system Al/PoOu/Al showed blocking contact, presumably due to the oxide layer present on the evaporated Al electrode. In the case of Al as the top electrode and SnO₂ or In₂O₃ layer on a glass substrate as the bottom electrode, SOLC was observed when Al was biased negative. However, when SnO₂ was biased negative, electrode limited current behavior was observed. When In₂O₃ was biased negative, a negative resistance effect was observed.

BRIEF ANALYTICAL EXPRESSIONS ON PROFILES OF POTENTIAL,FIELD AND CHARGE DENSITY IN SURFACE SPACE CHARGE LAYERS OF SEMICONDUCTORS

NI QINGXIAO

1987, 5(4):  363-367. 

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This paper presents brief analytical expressions on profiles of potential, field and charge density in strong accumulation layers and strong inversion layers of semiconductor sarface layers. A characteristic length D is defined and its physical significance is discussed.

APPLICATION OF LARGE AREA LOW ENERGY ELECTRON BEAM ANNEALING IN FABRICATION OF 4ETPM INTEGRATED CIRCUIT

DU YANCHENG, LU ZHONG, WU SUHUA, YU ZENGQI, LI XINFU, SUN DIECHI, LI FUMING

1987, 5(4):  368-371. 

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Using a large area low energy electron beam, a technique of rapidly annealing 4ETPM has been shown. The characteristics of ion-implanted resistor, transistor, Schottky diode and gate indicate that this can successfully be used in E-beam annealing for IC fabrication.

A RESEARCH ON PENETRATION BY MICROWAVE DIATHERMY

HU CHANGYING

1987, 5(4):  372-376. 

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In the practice of microwave diathermy, electrical penetration and thermal penetration must not be confused since they are two different concepts. The factors, such as aperture of applicators and polarization, which influence penetration but are often neglected, are indicated. According to the view of this article, the thermal penetration can be enhanced by definite method in the same condition. Experiments showed that a depth of over 1 cm can be obtained in muscle at 2450 MHz.