Table of Content

31 December 1992, Volume 10 Issue 4

Previous Issue    Next Issue

Articles

CONDITIONS OF PERFECT ABSORPTION FOR SINGLE-LAYER ELECTROMAGNETIC WAVE ABSORBER UNDER OBLIQUE INCIDENCE

LIANG CHANGHONG, ZHAO XIANGYANG, HU XIAOPEI, YANG DESHUN

1992, 10(4):  283-287. 

Asbtract ( 430 )   PDF (279KB) ( 90 )  

Related Articles | Metrics

The conditions for perfect absorption under oblique incidence in a single-layer homogeneous absorber backed by a perfect conducting plate is studied in this paper. The oases corresponding to the two types of polarization of the incidence-wave, perpendicular polarization (TE) and parallel polarization (TM), are discussed respectively. Some conclusions and curves are given.

STUDY OF THE DYNAMIC RE AD/WRITE PROPERTIES OF MAGNETO-OPTICAL (MO) DISKS

WANG WEIJIE, YU WEIJIA, XIAO ZONGYAO, YAO XINHUA, XU XIAOCHENG

1992, 10(4):  288-292. 

Asbtract ( 314 )   PDF (335KB) ( 75 )  

Related Articles | Metrics

This paper reports the dynamic read/write properties of magneto-optical (MO) disks having an AIN/TbFeOo/AlN/Al multilayer structure. When the recording bit size is 1 μm, the value of carrier to noise ratio (0/N) of MO disks exceeds 45 dB. This paper also discusses some reasons which affect 0/N, according to the measured results.

INTERACTION BETWEEN MAGNETOSTATIC FORWARD VOLUME WAVE AND OPTICAL WAVE GUIDED IN LAYERED YIG FILM

HE HUAHUI, SU JUN, FENG ZEKUN, OUYANG JIA, CHEN OHUANZHU

1992, 10(4):  293-298. 

Asbtract ( 316 )   PDF (389KB) ( 76 )  

Related Articles | Metrics

In this paper, the coupling optical mode amplitude equations under the perturbation of magnetostatic wave (MSW) have been derived with a new perturbation method; the Bragg diffraction efficiencies and the scanning characteristics of MSW-optical wave interactions are discussed; the nonoollinear interaction between magnetostatic forward volume wave (MSFVW) and the optical wave end-butt coupled into the YIG film is realized; and the effects of MSFVW frequencies and power on the interaction are studied.

ASYMPTOTIC THEORY FOR FOUR LAYER DIELECTRIC OPTICAL WAVEGUIDES

WANG ZIHUA

1992, 10(4):  299-303. 

Asbtract ( 402 )   PDF (303KB) ( 81 )  

Related Articles | Metrics

In this paper we present an essentially analytic method for solving four layer planar optical waveguides by using the asymptotic theory which expands the propagation constant into asymptotic series in terms of a small parameter. This method itself is exact and can approach any accuracy desired. However, tha numerical results for a crystal[fiber-optic polarizer show that the second order solution is accurate enough.

RESEARCH ON DIRECTIONAL COUPLER 4×4 OPTICAL WAVEGUIDE SWITCH ARRAY

SHEN QISHUN, GONG XIAOCHENG, QIOU WEI

1992, 10(4):  304-310. 

Asbtract ( 514 )   PDF (445KB) ( 175 )  

Related Articles | Metrics

The LiNbOs optical waveguide switch array is an important component in broadband optical communication networks. We have designed and fabricated a 4×4 optical waveguide switch array-5 interconnected directional couplers with alternating △β electrooptical modulation. The parameters of the device are:a-lOdb fiber-device-fiber-insertion loss, a-20 db crosstalk, a 15V-drive voltage, a <1.4 ns response time and a l.3μm operating wavelength.

CONFOCAL LASER SCANNING MICROSCOPE AND DETECTION OF INTEGRATED CIRCUITS

ZHANG ZHONGNING, ZHANG SHUYI, LIT YUESHBNG, GUO LIANG

1992, 10(4):  311-317. 

Asbtract ( 423 )   PDF (2548KB) ( 115 )  

Related Articles | Metrics

A new type of imaging detection system, confocal laser scanning microscope (OLSM), has been established, Using the optical confocal method, laminated imaging of three-dimensional reconstructions and quantitative measurements of structures with height differences can b& obtained. OLSM images, thus obtained, tend to have better resolution (spatial resolution is about 0.2/μm) and sharper contrast than those obtained with an optical microscope. Furthermore, OLSM haa the function of photoelectric imaging. The detection results of several integrated circuits are shown in this paper, which proves OLSM is a convenient, effective, noncontact and nondestructive detection system for the images and measurements of semiconductor materials and devices, as well as other samples Such as biological materials, etc.

A METHOD OF MULTIPLE-CRITERION OPTIMIZATION OF IC'S WITH INCOME MAXIMUM APPROXIMATION

HAO YUE, JIA XINZHANG

1992, 10(4):  318-324. 

Asbtract ( 374 )   PDF (452KB) ( 71 )  

Related Articles | Metrics

Based on the consideration that the acceptable region of 10's is capable of change, a method of multiple-criterion optimization with income maximization is proposed and the procedure of solving approximation function of income maximization is given. Then taking the optimal design of a real circuit for example, the necessity of replacing yield maximization with income maximization for the optimization design of Id's is demonstrated.

A NEW MODEL FOR MULTILAYER RELAXATION OF METAL SURFACES

HUANG YONGLI, JIANG PING

1992, 10(4):  325-330. 

Asbtract ( 427 )   PDF (385KB) ( 88 )  

Related Articles | Metrics

We have developed the modified point-ion model of Jiang, Jona and Marcus, which has been successfully used to calculate the multilayer relaxation of metal surfaces. In this paper a charge distribution function of a single exponent is assumed for the calculation of Surface relaxation. It is found that the surface multilayer relaxation can be predicted as long as the charge distribution information of the given metal is available.

VARIABLES SEPARATION DECOMPOSITION OF BOOLEAN FUNCTIONS

LIU YONGCAI

1992, 10(4):  331-338. 

Asbtract ( 462 )   PDF (454KB) ( 108 )  

Related Articles | Metrics

Given a totally or partially defined Boolean function f(x₁,…, x_n), the problem that under what conditions f(x₁,…, x_n)=g((x₁,…, x_is)·h(x_j,…, x_t), where sets {i₁,…, i_s} and {j₁,…, j_t} are a partition of set {1,…,n}, is very interesting and important. Two decomposition methods are presented in this paper. They are suitable for the totally or partially denned Boolean function which is represented by an expression or a truth table, respectively.

NEW ALGEBRAIC ALGORITHM FOR COMPUTING THE EULER NUMBER OF 3-D IMAGES

YANG JINGAN, ZHANG DIANCHBNO

1992, 10(4):  339-346. 

Asbtract ( 299 )   PDF (1336KB) ( 95 )  

Related Articles | Metrics

This paper proposes a new algebraic algorithm for computing the Euler number of 3-D images. It is based on mathematical principles in differential geometry and algebraic topology. The basic idea can be easily generalized to images defined by other data structures such as a hierarchical data structure. We find that this kind of mathematical description of the basic structures of the objects which are invariant under rigid transformations such as rotation and translation of the ambient Euler space is a useful approach to analyse and understand 3-D images.

DIFFERENT KINDS OF METHODS FOR EVALUATING CYLINDRICITY ERRORS ACCORDING TO MINIMUM CONDITIONS

MAO YOUGEN

1992, 10(4):  347-352. 

Asbtract ( 568 )   PDF (363KB) ( 104 )  

Related Articles | Metrics

This paper, according to the principle of Minimum Conditions in national and international standards of shape-position errors, builds a mathematical model with coordinate methods for evaluating cylindrieity errors, provides Several kinds of methods and individual programming block-diagrams for solving this model, and compares the advantages and disadvantages for all of these methods through computing an example from practice.

THE SOL-GEL-MATERIAL TRANSFORMATION OF ZnO-Al₂O₃-SiO₂:Eu³⁺,Bi³⁺ AND INVESTIGATION OF ITS LUMINESCENCE PROPERTIES

LI BIN, OU CHANGJUN, BAI YUBAI, ZHANG GUIQIN

1992, 10(4):  353-358. 

Asbtract ( 327 )   PDF (419KB) ( 55 )  

Related Articles | Metrics

The luminophors, 2.686ZnO-1.6Al₂O₃-5Si02:0.05Eu³⁺, 0.007Bi³⁺, were synthesised using the sol-gel method. The transfer process from sol to gel were studied by small angle X-ray diffraction, IR spectra, X-ray powder diffraction and TG-DTA. The luminescent properties of the sample and the energy transfer from Bi³⁺ to Eu³⁺ were discussed according to the emission and excitation spectra of the luminophors.

OPTIMAL PERFORMANCE OF A MAGNETIC STIRLING REFRIGERATOR

HU YALIEN, WU FENG

1992, 10(4):  359-363. 

Asbtract ( 492 )   PDF (309KB) ( 79 )  

Related Articles | Metrics

In this paper, the effect of the irreversibility of heat conduction, and finite rate processes on the optimal performance of a magnetic Stirling refrigerator are studied. The relation between the optimal rate of refrigeration and the performance coefficient is derived, Thus, it will provide some bases for the optimum design of a magnetic Stirling refrigerator and the reasonable choice of the magnetic material.

THE STUDY OF THERMAL DEGRADATION OF POLYOXYMETHYLENE

CHEN WBI, ZHOU WBNQIAO, FENG YANGJIE

1992, 10(4):  364-370. 

Asbtract ( 617 )   PDF (448KB) ( 166 )  

Related Articles | Metrics

Using the thermal analysis technique (TG/DTA/DTG), we have made the research of POM thermal degradation without oxygen in different experimental conditions, determined the mechanism of POM thermal degradation without oxygen ag the first order random degradation and obtained the kinetic parameters of degradation, E, In A and L the least number of repeating units of polymers not volatilized).