Table of Content

31 December 1995, Volume 13 Issue 4

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Articles

GEOMETRIC MODEIS FOR COLD ROLL FORMING OF CONICAL ROLLERS WITH THEIR AXES FIXED IN DIFFERENT PLANES

YANG HE

1995, 13(4):  379-386. 

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From the fundamental conditions of deformation and kinematics, the geometric models for cold roll forming of conioal rollers,with the axes fixed indifferent planes,are establised.The functional relations between the leading parameters controlling the workpieee deformation and the results obtained by the proeess are found and verified through experiments.The ideal condition of the roll forming is prosented to provide the scientific basis for the prediction and the optimlzation of the process parameters.Important results as a guide to the practice and development of the process are also obtained.

THE MEASUREMENT OF AC FORCES BY SCNNING PROBE SYSTEM

ZHANG JIE, WANG ZHAOQWIU, ZHANG SHUYI

1995, 13(4):  387-392. 

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A method of measuring an ac force by a scanning probe system is proposed.The lever of the system is driven by the ac force between the sample and the tip of the lever,so that the ac force can be determined by the amplitude of the vibration of the lever,which is measured by a heterodyne laser interferometer. The variation of the force with the distance between the sample and the tip,and the electric and magnetic fields are deteeted.The thickness of thin films is measured,The force detection sensitivity is also discussed and is estimated to be about 10^-11 N.

EFFECT OF ALLOYING ON Fe₃Al ALLOY'S COMPRESSION PROPERTY

YIN YAXSHEHG, LIU JUNYOU, SHI ZHONGLIANG, SUN YANGSHAN, MEI JIANPING

1995, 13(4):  393-399. 

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The compression properties of 17 different as -cast Fe₃Al alloys were tested and analyzed.The experimental results show that alloying process has great influence on the compression properties of as-cast Fe₃Al alloys,and Ce has much greater influence than the other elements.

THE DETERMINATION OF CUBIC DEGREES IN LaAlO₃ SINGLE CRYSTAL WAFER WITH ASYMETRICAL X-RAY DIFFRACTION TECHNOLOGY

HAO JIANMIN, WEN YELI, ZHANG SHIMIN

1995, 13(4):  400-404. 

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The{hkl}_c X-ray diffraction peaks splitting due to the pseudocubic system in the LaAlO₃ single crystal wafer has been analyzed.It is found that the splitting for{hol}_c is simpler than that for other peaks.The splitting angle for {hol}_c is measured for a (ool)_c LaAlO₃ sample by the asymmetrical θ~2θ X-ray diffraction technology.The relation between the splitting angle and the rhombohedral lattice constant a in LaAlO₃ is established.The cubic degrees of an LaAlO₃substrate containing YBCO film is measured,with no destruction to the film and the substrate.The experimental technology here is very suitabler for researching the defect relation between the film and the substrate in the process of growing and annealing.

INVESTIGATION OF PHOTOLUMINESCENT POROUS SILICON FORMED BY CHEMICAL ETCHING

MO YAOWU, AN QILIN, CHEN WET, LIU ZUGANG, JIANG XUEYIN, SHI WEIMEN, WU WENHAI

1995, 13(4):  405-412. 

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The formation of photoluminescent porous silicon layers (PSL) in HF-HKO₃ based solution is reported,Photomicroscopy and scanning electron microscopy (SEM) reveal that the etched Si has valvet morphology.From the shape of hills on the surface varying with the orientation of Si wafer,we can conclude that chemical etching (CE) is preferential.Colour cycles appear in the etching process and while the colour cycles are at the critical time,the sample has the bnightest photoluminescence (PL).PL spectra show that the luminescent intensity of CE is nearly an order of magnitude smaller than that of PS formed by anodization.The peak energy of CE Si is from 1.94~2.04 eV,and the full width at half maximum intensity (FWHM) is from 0.25~0.41 eV.The Stability of CE Si is discussed,as well as that of PS formed by anodization.

RAMAN SCATTERING INVESTIGATION OF HEAVILY BORON-DOPED SILICON FILMS GRCWN BY MOLECULAR BEAM EPITAXY

WANG JIANBAO, YUAN JIAN, YANG MIN, HUANG DAMING, LU FANG, SUX HENGHUI

1995, 13(4):  413-418. 

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Heavily boron-doped silicon films grown by molecular beam epitaxy are investigated by Raman scattering. The lineshapes of Raman spectra are analyzed based on the theory of electron-phonon interaction. The relation between the linewidth and the carrier concentration is established experimentally,and the resul is consistent with the theoretical estimation found in previous literature.The relation provides a calibration for determining the carrier concentration through Raman scattering measurements.

A GENERALIZED QUANTUM ANHARMONIC OSCILLATOR SHEN WENDA

SHEN DAWEN, ZHANG JIALUN, DENG SHENG, R D KHAN, WANG SHENGTAO

1995, 13(4):  419-426. 

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A velocity-dependent quantum forced an harmonic cscillator is studied,and its exact solution is obtained by adopting the iteration mothod and the integral operators.The studyis carried on in operational form via the raising and lowering operators of the oseillator.The time developnment of the displacement and momentum operators of the quantum anharmonic osoillator is presented in shape of a Laplace transform and a subsequent inverse Laplace transform of suitable functionals.

EFFECT OF SURFACE OPTICAL PHONON ON SURFACE IMPURITY EXCITED STATES T P

T P WONG, X Y TENG

1995, 13(4):  427-430. 

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The excited states of the snrface optical phonon bounded to an impurity atom centred on the surface is calculated by means of the variational priciple. It is found that the effect of the SO-phonon is significant even on the excited state energy.

TECHNIQUES AND RESULTS FOR ATTENUATING NOISE IN REAR AXLE HOUSINGS

YI CHUJIE, ZHANG JAIN, SONG LEIMING

1995, 13(4):  431-438. 

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Based on the measurement and analysis results of vibration and noise in the rear axle housings,the paper presents some techniques and results for attenuating noise in the honsings.The paper is composed of three parts:(1) reasonable verification of the techniqnes; (2) investigation on the mechanism for film damping and (3) experiment an evaluation to noise rednction using these techniques.

TWO-LAYER ARCHITECTURE AND STRATEGIES FOR ROBITIC MULTISENSOR DATA FUSION

WANG XIAOGANG, QTAN WENHAN

1995, 13(4):  439-446. 

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In recent years,there has been increasing interest in the development of robotic distributed sensor networks,but little is known in the area of the architecture and strategies for multisensor data fusion.This paper constructs a model of two-layer architecture and strategies of sensor fusion of the data level and evidence level.The model embodies the principle of information processing in data fusion problems.According to the proposed structure,this paper describes the efficient algorithms for multisensor data combination and information fusion usin Bayes parameter estimation and Dempster-Shafer's theory.An example is considered in detail.

TRANSPORT IN THE BULK OF POSITIVELY CORONA CHARGED POLYFLUOROETHY LENEPROPYLENE ELECTRETS

JIAXG JIAN, JIANG HUA, XIA ZHONGFU

1995, 13(4):  447-451. 

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In this paper,taking the commercial Teflon FEP films by Du Pont Co.,and the FEP (F_4,6) films by Shanghai Plastics Research Institute as examplis,the shift of mean charge depth during the TSD after corona cbarging at RT was studied by means of the heat pulse technique and thermally stimulated discharge.The transport rule of the detrapping charge in the bulk of the sample was discussed.Charge storge stabilities of the two types of positively corona charged polyfluoroe-thylenepropylene electrets at room temperature were compared.

IDENTIFICATION OF TIME SERIES OF GYROSCOPE RANDOM DRIFT

WU SHAOMIN, WAN DEJUN, ZHOU BAILING, HUANG REN

1995, 13(4):  452-456. 

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In this paper,a new time series model which is called the weakly non-linear time series model is produced.We use this model to identify the Gyroscope Random Drift,and to give a simulating example to illustrate the application of the algorithm which is proposed in the paper.

AN OTHOGONAL LEAST SQUARE ESTIMATION METHOD OF TIME-VARYING AR MODEL AND ITS APPLICATION IN ENGINEERING

SHI ZHAOYUN, ZHOU BALLING

1995, 13(4):  457-460. 

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The time -varying AR model can be applied to analyse nonstationary signals;the parameters estimation often uses the Least Sqnare methodology now. This papelr provides several problems in LS estimation of this kind of model,and an othogonal LS algorithm is proposed.High accuracy is achieved in predicting the control of the dynamics of pH in cyclic cooling water.

THE PHASE TYPE STRUCTURE METHOD OF RELIABILITY ANALYSIS ON CIMS PRODUCTION LINE WITH VELOCITY ADJUSTED BY A BUFFER

LI JUNJIE, LI QUANLIN

1995, 13(4):  461-468. 

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This paper gives a new phase type structure method of reliability analysis on CIMS production line with the velocity adjusted by a buffer. By means of the closed loop queue network of quasi birth and death processes,all the information in the system is given into a uniform matrix. All reliability and production inde-xes of the system are obtained.The local phase type strctures of the system are discussed in detail. Thus,the flexible mechaniem of the man-machine coordination of CIMS is realized.

ASYMPTOTIC AND OSCILLATORY BEHAVIORS OF FIRST ORDER NFDE WITH CONTINUOUS DISTRIBUTED DEVIATING ARGUMENTS

FU XILIN, ZHANG LIQIN

1995, 13(4):  469-477. 

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Consider the following first order neutral functional differential equations (simply NFDE).

PREPEPERATION OF THE POLYETHER -OIL -BASED FERROFLUID AND ITS APPLICATION IN THE ROTATORY VACUUM SEAL

ZHANG DUNMING, ZHOU QINGLI

1995, 13(4):  478-482. 

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Several siable polyether-Oil-based ferrofluids were prepared by dispersing magnetic particles in polyether oil with a polyether-phosphate surfactant.The magnetic particle was made by co-precipitating the Fe²⁺,Fe³⁺,Fe³⁺ salt solutions with a base,Examined by TEM,the magnetite with an average diameter about 10nm was dispersed very well.A sample ferrofluid RE-Ⅲ (4πM_s=0.0450 T) had been used in the rotatory seal in an X-ray diffraction instrument,which has been working at 3000r/min and 2.7×10^-5 pa for more than two years.

DIAMOND THIN FILMS DEPOSITION BY USING HALOGEN CONTAINING SOURCE MATERIALS

CAO CHUANBAO, PENG DINGKUN, MENG GUANGYAO

1995, 13(4):  483-487. 

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using CH₄,CCl₄ and H₂ mixtures as source materials,We successfully synthe-sized diamond thin films at 570~580℃by the microwave plasma CVD process.The diamond thin films were characterized by the Raman spectrum,XRD,XPS and IR spectrum. The surface morphology of the films was observed with the Scanning Electron Mierosope. It was found that because CCl₄ compound was introduced,the diamond nucleation density decreased.And when the concentration of CCl₄ reached to 2.0%,no deposit but etehing pits could be formed.This was because of the existence of HCl in the system. The possible reason of substrate temperature decreasing in halogen containing system was discussed.

AN ORIGINAL ACTIVEE MICROWAVE REMOTE SENSOR L-BAND COHERENT POLARIZATION SCATTEROMETER

ZHU WEIZHONG

1995, 13(4):  488-490. 

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This paper introduces a newly developed L-Band coherent polarization scatte-rometer.The scatterometer can measure simultaneously the amplitude and phase Information of different polarizations scattered from objects,i. e. it can measure the multi-scatter.coefficionts of different polarizations seattered from objects.

MODELING OF FOTD OF THE GROUND PROBING RADAR

YU WENHUA, REN LANG, PENG ZHONGQIU

1995, 13(4):  491-494. 

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In this paper,the sine and cosine transforms are applied to transform 3 dimension FDTD to 2 dimension FDTD in layered media. We employ the transmitting boundary condition to eliminate reflections from the boundary of the domain,and use the superabsorption technique to improve the accuracy of FDTD.The method is applied to the ground probing radar with satisfactory results.

NONLINEAR EQUATION FOR THE REFLECTION COEFFICIENT OF A LOSSLESS MEDIUM AND ITS NOVEL INVERSE SCATTERING SOLUTION

CUI TIEJUN, LIANG CHANGHONG

1995, 13(4):  495-498. 

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A nonlinear equation for the reflection coefficient of a lossless medium is derived by using a microwave networking technique, and a novel inverse scattering solution to the permittivity profile is further investigated by considering the dis-continuity of the medium at x=0.