Table of Content

30 September 1986, Volume 4 Issue 3

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Articles

Thermodynamical Theories Survey and Comoparison

W. MUSCHIK

1986, 4(3):  189-200. 

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Each survey of a field is based on a subjective choice and valuation of the subject which can not be undertaken without any arbitrainess.

LOW ALTITUDE PERFORMANCE OF DOPPLER NAVIGATION RADAR ANALYSIS AND CALCULATION

LIU KUOTING, WANG YINGJUN

1986, 4(3):  201-206. 

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The paper is in 2 parts. The first part is the analysis of why the low altitude is limited in frequency modification continuous wave Doppler navigation radar. It demonstrates that the radar works at zero altitude when J₁ (M₁) side frequencies are adopted. Here, J₁ (M₁) is the first order of Bessel function. Otherwise, there is a limitation in minimum altitude. The calculation method for this minimum working altitude is deduced. The second part is the analysis of why there is a low altitude limitation in pulse Doppler navigation radar and a simple and direct method for calculating the minimum working altitude is deduced. This method is used to calculate the minimum working altitude of AN-APN-220C Doppler navigation radar. It is found that the result is in agreement with the value measured by TELEDYNE RYAN Co. in U. S. A.

SINGLE-BEAM PHOTOACOUSTIC SPECTROSCOPE SYSTEM

QIU SHUYE, ZHANG SHUYI, HU CHUNNIAN, WEI LANHUA

1986, 4(3):  207-212. 

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A single-beam photoaooustio spectroscope system with the spectrum normalized by means of a microcomputer is described. The evaluation of the system is done by analyzing the spectrum of Ho₂O₃. Photoacoustio spectra for several samples, such as different types of iron oxides crystallines, abnormal bloods and some chomioal materials are obtained. These preliminary applications show that photoaooustic technique is a very useful tool for research and analysis work in the fields of physics, chemistry and medical sciences.

STUDYING THE STRUCTURE OF NaY ZEOLITE WITH VARYING DEHYDRATION LEVEL USING X-RAY POWDER DIFFRACTION

YU YINLIANG, ZHENG PCIU, XU ZISHENG, CHENG MINGQIN, WANG BOY

1986, 4(3):  213-218. 

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The four samples with varying water content were kept in double layer plastic bag. The intensity data up toS (H²+K²+L²)=384 were collected on a 12kW powerful rotating anode X-Ray diffraotometer in step scan mode. The coordinates and occupancy factors of sodium ions and water molecules were determined by F₀ and △F syntheses. The structure was refined by least-square method. The values of R were below 0.16. The bond lengths and bond angles derived from coordinates fell in normal ranges.
This study has shown the following results. On removal of water molecules, sodium ions in superoages migrate toward β cages and hexagonal prisms. In addition, sodium-water interactions decrease and sodium-oxygen interactions increase in dehydration process.

THE DRAWING METHOD OF THE TRAJECTORIES OF INCIDENT ELECTRONS WITH GAUSS DISTRIBUTION IN SOLIDS BY MONTE CARLO SIMULATION

HE YANCAI, CAO LIQUN

1986, 4(3):  219-225. 

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The trajectories of incident electrons with Gauss distribution in solids were calculated and drawn by Monte Carlo simulation in this paper. The flow chart of the calculating and drawing program was given.

EFFECT OF PHONON DISPERSION ON EXCITON

GU SHIWEI

1986, 4(3):  226-230. 

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In this paper, the dispersion of the longitudinal optical phonon is considered in a parabolic approximation. The effective Hamiltonian is derived by the use of a perturbation method. It is found that the more the phonon dispersion, the larger is the effective mass, and the smaller the screening radius of electron-hole effective interacting potential.

PROJECTION TYPE MOIRE TOPOGRAPHY AND ITS APPLICATIONS

ZHANG FUBAO

1986, 4(3):  231-236. 

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The contour lines are the best forms to describe the geometry of a three dimensional object.
With the theory of modern optics, this paper derives the oomputed formula of the contour Moire fringes of a shape of a three dimensional object, i. e.

METHODS AND RESULTS OF MEASURING SURFACE HEAT LOSS OF STEAM PIPES WITH IR THERMOMETER

ZHANG CAIGEN, WANG HONGXI, WU YINSHEN

1986, 4(3):  237-241. 

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In this paper, we present a method and results of measuring the surface heat loss of steam pipes with IR thermometer. Data demonstrate that the measured results are in good agreement with that obtained using enthalpy potential method.

A FURTHER STUDY ON MULTIPLEXED SEQUENCRS

CHEN LIDONG

1986, 4(3):  242-249. 

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The paper investigates the pseudorandom properties of multiplexed sequences and gives the shift equivalent conditions of multiplexed sequences for fixed LSR₁ and LSR₂ tinder distinct injeotive maps γ and distinct choices of stages A_τ0, A_τ1, …,A_τk-1. Finally, the results of multiplexed sequences extended on GF (p) is given.

ON THE RELATIONSHIP BETWEEN THE EIGENVALUES OF TRIDIAGONAL MATRIX AND OF ITS SUBMATRICES

MU DINGYI

1986, 4(3):  250-257. 

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Suppose tridiagonal matrixthree problems will be considered in this paper:
(1) Estimate the upper bound for d_l (λ)=min|μ_i-λ|.

ON MCCORMICK IDEALIZED EXACT PENALTY FUNCTION

ZHANG LIANSHENG

1986, 4(3):  258-263. 

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In 1978, G. P. McCormiok[3] developed an idealized exact penalty function as follows.

ANALYSIS OF STABILITY IN DIRECT CURRENT MOTOR OPERATION

ZHANG CHANGBO, XU BAOZHI

1986, 4(3):  264-269. 

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This paper deals with the problem of stability in the ordinary nonlinear differential equations during the direct current operation.

STUDY ON SOLID-STATE CATALYSTS AND GASEOUS PTODUCTS OF REDOX REACTION BY PHOTOACOUSTIC SPECTROSCOPY

MING CHANGJIANG, LIU YAOTIAN, WAKG WENYUN

1986, 4(3):  270-275. 

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The principle and characteristic feature of photoacoustic spectroscopy, which is tased on the photoaooustio effect, and its application in the investigation of catalysis are described.
The photoaooustio spectra of ZnO, Zn-Tl and Zn-Al we measured help gain an insight into the nature of benzene synthesis by catalytic dehydrogenation of prope-ne. It has been demonstrated that PAS is ver-y suitable for rapid explorating the surface property of various opaque solid catalysts and analyzing reactant gases and resultant gaseous products. Therefore, PAS is a new technique worthy of attention for catalysis study.

COMPUTING RESONANT FREQUENCIES OF CYLINDRICAL DIELECTRIC RESONATOR WITH FINITE-DIFFERENCE METHOD

LI YING, LUO SIFEN

1986, 4(3):  276-279. 

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The boundary condition, which must be satisfied while computing the resonant frequencies of cylindrical dielectric resonators used in microwave circuits with the finite-difference method, are dealt with by introducing fiotioious variables. This paper describes in detail how the boundary conditions are treated. Compared with Pospieszalski's data, the errors in our case are less than 6.8% and 1.7%, respectively. When meshes are properly chosen, errors can be further reduced.

A MATHEMATICAL MODEL OF THE CURVED PARAMETER FOR THE GENERAL STANDARD PIPES IN THE SHIPPING PIPE SYSTEM

LI ZHI LIANG

1986, 4(3):  280-282. 

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In this paper, a mathematical model of the curved parameter for the general standard pipes is established in the miniature layout of the shipping pipe system. It describes the computing method and extends the method in[1].