Table of Content

30 June 1995, Volume 13 Issue 2

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Articles

COAL PARTICLE SURFACE CHARACTERISTICS AND SURFACE SMOOTH FACTOR THEORY IN COMBUSTION

GU FAN, XU JINYUAN, SHEN HONHMEI

1995, 13(2):  127-135. 

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The present paper experimentally and theoretically investigated the coal particle surfaee in combustion,The measurement system composed of an ESM and an image computer was developed and used.The particle surfaces were measured with the system for various kinds of coal in different burning ways. Based on the experiment,the particle surface smooth factor theory of coal combustion was put forward, The relationship between coal combustion and the particle surface smooth factor was established in the theory,The effects of combustion on the particle surface were discussed.

OPTICAL TOMOGRAPHY AND IMAGE PROCESSING SYSTEM FOR MEASURING 3D ASYMMETRIC FLUID FIELD

XIAO XUDONG, SHI DUFANG, CHEN SHAOHUA, HAN CAIYUAN

1995, 13(2):  136-142. 

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In this paper,a simple holographic interferometric system that can obtain multi-directional interference fringe data in optical tomography is designed.The interferograms of the spreading heat air flow are processed and measured by means of the computer image analyzing and processing system. The temperature distribution of a section in the air flow is reconstructed, and compared with the temperatures by a thermal couple at three points.

DETERMIMATION OF THERMAL CONDUCTIVITIES OF ENERGETIC MATERIALS BY MICROCALORIMETRY

HU RONGZU, LI NAN, CHU SHIJIN, CHEN XUELIN

1995, 13(2):  143-158. 

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A device of measuring the thermal conductivity of the pellets of propellsants and explosives has been constructed. A method and a calculation formula for determining the thermal conductivity of the pellets of propellants and explosives under the constant radial heat flow ceondition by the use of Peltier and Joule effects are presented. Using this device and inicrocalorimeter, type RD-496-Ⅱ,the instrument constant and coefficient of themal disequilibrium have been determined and the thermal conductivities of thirteen materials:quartz glass,plexiglass, teflon, polyethylene, DB propellant DB-2 (nitrocellulose (NC)/nitroglycerine (NG)/dinitrotoluene/dimethyl centralite/vaseline/PbI/CaCO₃,59. 6/25/8.8/3/1.2/1.2/1.2), DB propellant SQ (NC/NG/diethyl phthalate (DEP)/binder, 59/29/7/5), DB propellant RHN-149 (NC/NG/triacetin (TA)/binder-Ⅰ,52.25/25/8/15),DB propellant RHN-190/NC/NG/TA/biuder-Ⅱ, 52/26/7/15). 2, 4,6-trinitrotoluene (TNT), composition B, desensitised (TNT/cyclotrimethylene-trinituramine (RDX)/polyquinone/mononitrotoluene (MNT)/wax, 40/60/0. 5/0. 4/0.5), explosive JH-9105 (RDX/binder/desensitiser, 95. 59/3. 92/0. 49), explosive JO-9159 (cyclotetramethylenetetranitramine (HMX)/binder-I/desensitiser, 95/4. 3/0. 7) and explosive JO-9185 (HMX/binder-Ⅱ/desensitiser, 95/4/1) at 298K are measured.

STUDY OF THE PLASMA PRODUCED BY YAG LASER ACTING UPON SILICON PHOTODIODE

NI XIAOIWU, LU JIAN, HE ANZHI

1995, 13(2):  159-162. 

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The plasma produced by the Q-switched YAG laser acting upon a silicon diode having a PIN junction has been investigated theoretically and experimentally.Mach-Zehnder interferograms of the plasma and related computed results have been obtained for the first time.

THE REDUCTION OF TRAVELLING WAVE SCATTERING BY MAGNETIC DIELECTRIC COATING LINZHISEN

LIN ZHISEN, NI WEILI

1995, 13(2):  163-168. 

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In this paper, polarized currents and conductive currents are used in the analysis of the scattering from magnetic dielectric coated objects, The relation between the electromagnetic property of the material and the travelling wave is studied. It shows that a thin layer of lossy magnetic coating is effective for reducing travelling wave scattering.

EXPERIMENT ON MAGNETO-OPTICAL DISK AGAINST ADVERSE CIRCUMSTANCES

MIAO XIANGSHUI, LI ZUOYI, HU YONGSHI, LIN GENGQI

1995, 13(2):  169-173. 

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The RE-TM magneto-optical recording film and protective film were prepared by RF sputtering or reactlve RF sputtering.By measuring from the film side and the substrate side,we studied the experiments of the magneto-optical disk material with protective films against adverse circumstances.The aging test and temperature dependence of these samples show that the TbFeCo films with AlN or AlSiN protective films have the excellent ability against adverse circumstances,and that thev can be used for magneto-optical disks with a wide temperature range.

STUDIES OF THE PULSED VUV RADIATION SOURCES WITH CONTINUOUS SPECTRUM

ZHOU XIAOYONG, ZHU SHAOLONG

1995, 13(2):  174-178. 

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The design and the investigations of a new vacunm ultraviolet (VUV) radiation source with continuous spectrum are presented.For enhancing the continuous spectrum intensity,the VUV source is designed to work under conditions of high pressure (0.2~0.9MPa) and short pulses.It is found from experiments that the breakdown voltage of the VUV source with a filling gas of hydrogen id about 8×10³ V and the pulse width 1×10^-7 sec,depending on the filling gas pressure and the electrode separation. The breakdown voltage is also theoretically calculated by the Meek breakdown criterion,and the pulse width by the discharge channel expansion theory,It is found that both are in reasonable agreement with the experimental results.

ARTIFICIAL NEURAL NETWORKS AS APPLIED TO QUANTITATIVE SPECTROSCOPIC ANALYSIS

LI ZHILIANG, LIU SHUQIONG, SHI LEMING, PAN ZHONGXIAO, LOU MANTENG, LI MENGLONG, YU BANMEI

1995, 13(2):  179-183. 

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The artificial neural networks (ANN) method is utilized in the analytical calibration and quantitative resolution for spectroscopy. The simulated and practical data are proeessed by using the multilayered perceptrons model and backpropagation (BP) algorithm. The results show that is practicable to adopt artificial neural networks to calibrate and resolve the spectroscopie data and peaks.

LOCAL FIELD IN A SINGLE -MODE HELICAL FIBER

CHEN GUANSAN

1995, 13(2):  184-188. 

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Based on the wave equation,we directly analyse a single-mode helical fiber with a circular cross section and step profile of the refractive index in the local coordinate system. Withe the perturbation method,the analytical expressions of the fundamental mode field and the propagation constant are given,Two results are brought about:(1) the fundamental modes in a single-mode helical fiber are right-rotated and left-rotated circularly polarised modes. (2) the difference of propagation constants between the two modes iS 2τ.The theoretical results agree with those of the known experimental measurements.

DISTRIBUTION OF TOTAL EL2 CONCENTRATION AND ITS FERMI OCCUPANCY FUNCTION IN UNDOPED LECSI GaAs

YANG RUIXIA, LI GUANGPING, WANG QIN

1995, 13(2):  189-194. 

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The distributions of ionized and neutral EL2 concentrations are measured by the multiple wavelength infrared absorption method in the undoped LECSI GaAs.The distributions of the total EL2 concentration and its Fermi occupancy function are also obtained from the measurement of the distrbutions of the ionized and neutral EL2 concentrations.The results indicate that all of the distributions of the ionized EL2 concentration,neutral EL2 concentration,total EL2 concentra-tion, and EL2 Fermi occupallcy function are inhomogeneous;that both total and neutral EL2 concentrations radial distributions are W-shaped;and that the W-shaped radial distribution of the neutral EL2 concentration is not due to the fluctuation of the Fermi occupancy function.

STUDY ON THE PROCESSING NETHOD OF PERIODIC AND TENDENTIOUS SIGNAL IN TIME SERIES MODEL -BUILDING

RUI XIAOJIAN, ZHONG BINGLIN, YAN JIGNPING, ZHANG YOUZHEN

1995, 13(2):  195-201. 

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By using the Green Function formula of the autoregressive-move-average model (A RMA model),the describing problem of the periodic and tendentious signal iS discussed. Based on theory deduction and modelling practice,it is obtained that the above signals can be correctly expressed by an ARMA model or AR model.So in the model-building process of time series, it is unnecessary and improper to eliminate these signals.This viewpoint differs from the traditional one of this problem.
The reason why the wrong view was developed is also discussed in this paper.

MATHEMATICAL MODEL ON THE DESIGN OF FUNCTIONALLY GRADICNT MATERIALS AND THERMAL STRESSES ANALYSIS OF FGM PLATES

ZHANG XIAODAN, QI GUO'AN, WANG ZHAOXIA, GE CHANGCHUN

1995, 13(2):  202-208. 

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In this paper, the analytical procedure for functionally gradient material (FGM) plates is developed based on the classical theory of laminated plates and the computational mathematical method.Temperature solutions are obtained for the steady state. Utilizing the material properties of each hypothetical layer,the effective properties are estimated and thermal stress distributions are caloulated.

FINITE-TIME THERMODYNAMIC OPTIMIZATION OF FINITE HEAT RESERVOIR STEADY-STATE HEAT ENGINE UNDER TWO KINDS OF RESTRAINING CONDITIONS

YAO SHOUGUANG

1995, 13(2):  209-214. 

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In this paper,the power and efficiency of the finite time steady-state heat engine operating between two reservoirs with finite heat-capacity rate are studied.The optimum power and efficiency of the finite time endoreversible Carnot heat engine under two kinds of restraining conditions and operating in two cyclic modes are derived analytically, and some new performance limits of the finite time thermodynamics are discussed.

NUMERICAL ANALYSIS AND APPLICATION OF SUPERPOSED DIELECTRIC RESONATIORS

WANG JIANHAI, DAI JUN, FANG WEIDE

1995, 13(2):  215-220. 

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This paper analysed numerically the superposed dielectric resonators by FDM. The numerical results are in very good agreement with the available published results and measured results.
With this strueture,it is possible to determine the local complex permittivity of M. I, C substrates.

ON ALGORITHM OF COMBINING MULTIPLE NEEDLE MAPS FOP RECOVERING 3-D SURFACE DEPTH

YANG JINGAN

1995, 13(2):  221-228. 

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This paper proposes an algorithm of combining multiple needle maps for recovering 3-D surface depth. The algorithm can produce first a pair of the needle maps by the dual photometric stereo system and solve disparities between the corresponding areas in the two needle maps,then it combines the disparities correctly and matches them accurately, and finally it reconstructs the 3-D depth of the object surface. This method is very useful for us to conduct research on 3-D surface depth reconstruction and to recover scene structures.

A STUDY ON LONG CHAIN SINGLE-AXIS ORIENTATION OF PI MOLECULES IN PI LB FILMS BY AFM

GU NING, YANG XIAOMIN, LU WU, LU ZHONG, WEI YU

1995, 13(2):  229-234. 

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The microscopic molecular structure of a polyimide (PI) Langmuir-Blodgett (LB) film monolayer was studied by atomic force microscopy (AFM).An AFM image of a PI monolayer on highly oriented pyrolytic graphite (HOPG) showing clearly the polymer chains was observed. The measured parameters in situ,for example,the distance between oxygen atoms at successive bends is 1.4nm~1.9 nm and the bend angle is about 118 deg.,correspond with those from STM results by the others.The procedure in which the PA3S (polyamie acid alkyl amine salt) film was converted to polyimide film by either the heating method or the solution method is very important.The preliminary results of comparing these two technological processes observed by AFM indicated that the solution method is more suitable for this PI LB film preparation in the usage of the future liquid-crystal display devices.

THREE BASIC CONSERVATION LAWS OF EVOLUTION EQUATIONS

YANG LING'E

1995, 13(2):  235-241. 

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This paper gave the existence of at least three conservation laws for a class of evolution equations.The conservative densities and conservative flows of these conservation laws were also given.

THE STUDY OF LIGHT -INDUCED SYNCHRONOUS FLUORESCENCE SPECTRA OF HUMAN NORMAL TISSUE AND BENIGN TRMORS AND MALIGNANT TUMORS

LIU JIAN, FU WEI, LI ANZHI, ZHANG GUANGYIN, LI ZHAO

1995, 13(2):  242-247. 

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The synchronous fluorescence spectra of △λ=60 nm of normal tissues, benign tumors and malignant tumors of the human cervix, uterus and oarium tissues have been measured with an FlllAI fluoreseence spectrometer. The results revealed that the synchronous fluroescence spectra peak numbers, peak positions and peakintensity are very different;the peak intensity ratio I1/I4 (normal tissue) < I1/I4 (benign turmors) < I1/I4 (malignant tumors).It is expetcted that the synchronous fluroescence spectra will be a new,quick,exact and more valid means for the early detection of cancer.

π^--¹²C INELASTIC SCATTERING AND NEGATIVE π-MESON THERAPY

CHEN KEZHONG, GUO BINGYING

1995, 13(2):  248-252. 

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The physical mechanism of therapy by negative π-meson shower is studied.The DWIA method is adopted to calculate π^--¹² inelastic scattering.Some characteristics and conclusions of the π-meson radiotherapy for cancer. are suggested.