Volume 17,Issue 4,1994 Table of Contents

1 The Optical Signal Processing of Distributed Fiber Optical Force Sensors

Li Zhigao , Pan Yingiun , Huang Shanglian

1994, 17(4).

[Abstract](852) [HTML](0) [PDF 0.00 Byte](1)

Abstract:
For the distributed fiber optical sen sor based on the principle of mede-coupling of polarization-maintaining fiber and the theory of partial coherence of quasi-monochromatic light,it is of great importance to process the weak optical signal from the sensing fiber.The characteristics of the optical slgnal was analyzed and suggestions were given for medified Mach-Zehnder interfer-ometer,which in cludes an acoustooptical medulator and a polarized-beam splitter to realize the het-erodyne in terferen ce. The method not only eliminates the influences of light source fluctuation and background light,but decreases the loss of the signal ptocessing,and improves S/N ratio.The experi-ment results coincide well with the analysis.

2 The High Speed and Miniature System for Measuring Dynamic Accuracy of Drive Chain

Qin Shuren , Gao Daqi , He Wei

1994, 17(4):1-5.

[Abstract](705) [HTML](0) [PDF 261.17 K](216)

Abstract:
介绍了高速小型传动链动态精度测量系统（ＱＨＳＳ）、高精度小型分度栅式传感器的设计与研制以及提高测量精度、装置的分辨率、传动链转速（＞３０００ｒ／ｍｉｎ）和传感器信号频率（＞１ＭＨｚ）的途径。

3 Experiments of the Transport Performance of Microchannel Heat Radiators

Yu Shiping , Xin Mingdao

1994, 17(4):6-11.

[Abstract](542) [HTML](0) [PDF 291.19 K](197)

Abstract:
对四种空气冷却的微通道散热器进行了实验研究。结果表明它们在４０℃温升和４９０Ｐａ压差下可传递１．６，４．８和７．４Ｗ／ｃｍ＾２的热流，其中一试件达２８ｗ／ｃｍ＾２（７０℃温升。８７０ＫＰａ压差）。四个试件有很大高宽比通道，分别达１６，２５，５０和６７，可有效地降低压差。实验结果用多孔介质模型进行了处理，表明Ｎｕ－Ｒｅ关系具有Ｎｕ＝ｃＲｅ＾ｎ（ｃ，ｎ是常数）的形式。但ｃ，ｎ随槽宽增大分别增大和减小。

4 A Numerical Simulation of Two-Dimension PoissonProcess and its Application in Simulation of an Uneven Road

Zhang Xiangwei , He Zhengyou

1994, 17(4):12-16.

[Abstract](923) [HTML](0) [PDF 230.13 K](1320)

Abstract:
An attempt is made to develop a numerical simulation rnodel of two-dimensionpoisson prcoess. Simulated and checked on computer,the road surface and spectrum of the roadwhich close to the ISO,The methed developed in this pa per is proved to be feasible and practicable.

5 Coupling Deformation and Stresses Between Layers in Sandwich Bar with Closed Section

ZhangPeiyuan , Wu Zulie

1994, 17(4):17-23.

[Abstract](680) [HTML](0) [PDF 252.82 K](1064)

Abstract:
According to the theory of thin-walled bar with closed section,a combined mod-el is esta blished of coupling deformation,and an accurate method of analysing stresses between lay-ers is suggested. With the medel,the analyses results were offered to sandwich bar with box section.

6 Study of the Digital Measurement Tachnique and Apparatus for Impulse High-Voltage

Chen Xianlu , Zou Jianming

1994, 17(4):24-28.

[Abstract](631) [HTML](0) [PDF 252.79 K](1002)

Abstract:
A digital measurement apparatus is developed for Impulse high voltage. Ine ap paratus composes of a high speed A/D converter(20 MHz),a single-chip computer interface and some other high speed analog intergrated circuits with excellent function,It is characteristic of flxing transient waveforms,storing,processing and analysing waveform data measuring maxi-mum value of impulse high voltage.

7 A New Fast Algorithm for the Discrete Cosine Transform

Wu Xiaoyun , Zhang Taiyi , Zhang Shuangteng

1994, 17(4):29-34.

[Abstract](1172) [HTML](0) [PDF 202.23 K](984)

Abstract:
We prepose a new fast algorithm for computing discrete cosine transform and its inverse on two dimensional input sizes which are powers of 2.Because the integer operation is more faster than the float operation in computer,the integer operation is used in this algorithm.Through the matrix linear transform the number of operation for multiplications and additions is reduced,so that the speed is greatly raised.This algorithm is applied to our developmented JPEG image coding,and yields very good results.

8 Sequential Diagnosis Algorithms in Asymmetric Models

Zhou Liuding , Wang xueqin , Chen Tinghuai , Yang xiaofan

1994, 17(4):35-40.

[Abstract](630) [HTML](0) [PDF 253.40 K](1048)

Abstract:
We discuss the diagnosis algorithm for sequentially t-diagnosable systems.Wepresent two algorithms,based on the Malek and the BGM model,respectively,with a polynomialtime com pleAlty when the test graph is a bipartite groph.

9 A New Method of Extracting Fault Components Under Power System Swing

Xiong Xiafu , Ye Yilin , LiXiaoqui

1994, 17(4):45-52.

[Abstract](600) [HTML](0) [PDF 320.02 K](1164)

Abstract:
To solve the problem that the existing method of extracting fault components is easily affected by power system swing,a new methed has been proposed in this paper,which can be used in high speed protection of transmission lines. This proped method ean greatly decrease unbal-ance outputs under power swing condilions without frequency tracking circuits,therefore it can make the protection using fault compnents operate correctly.

10 Mathematical Model of Methane Transport in Coal Seam

Zhang Guangyang , Tan Xueshu , Xian Xuefu , Du Yungui

1994, 17(4):53-57.

[Abstract](575) [HTML](0) [PDF 192.99 K](978)

Abstract:
This paper studies the effects of ground stress and ground electrical field onmethane transpont in coal seam. A gas seepage equation is set up based on the principles of seepagetheory,which takes the ground stress and ground electrical field into considerationz

11 Several Problems About Analyses of Finite Element Method on Coalbed Gas Seepage Flow

Yu Chuxin , Xian Xuefu

1994, 17(4):58-63.

[Abstract](624) [HTML](0) [PDF 249.66 K](822)

Abstract:
Based on the govering equation of gas seepage flow,this paper an alyzes;the re-lationship of the underground pressure and permeability of coal seams,discusses the averagedly dis-crete metheds of small terms of time variable which is related to mining progress of coal seams,and set up the element property form ulation on the basis of the weak statement of Galerk in integral e-quation.

12 Dual Theory of Nonsmcoth Multiobjective Programming with Set Functions

Sun Mei , Duan Yurong

1994, 17(4):64-69.

[Abstract](719) [HTML](0) [PDF 233.07 K](1045)

Abstract:
In this paper,for a nonsmooth multiobjective programming with set functions,Wolfe type duality and MondWeir type duality are established. Weak dual theorem,direct dual the-orem and in verse dual theorem about effictent solution are discussed.

13 TheExistence of Non-Collision Closed Orbits of Symmetric Singular Hamitonian Systems

Zhang Shiqing

1994, 17(4):70-72.

[Abstract](545) [HTML](0) [PDF 119.70 K](940)

Abstract:
Using classical minimization metheds,we study the existence of non-constantand non-collision clscoed orbits for a class of subquadratic symmetric singular HdmiItonidn Syselus

14 Determination of Bivalance Sulfer in Power Station Separated Sulfer Ash by Electrogravimetric Analysis Method

Xu Mmgxi , Xu Yi

1994, 17(4):73-78.

[Abstract](412) [HTML](0) [PDF 278.89 K](1151)

Abstract:
With the characteristic of dissclution of copper salts,the contert of S2-is indi-rectly figared out precipitating the S2-dding excess cpper salt and determining the left Cu2+ by theexlectrogravimetric analysis.This methed is accurate to be employed to measure directly the S2-con-tent in a complex system of mucti-valence sulfides,expecially whin the S2-content is high.

15 The Application of 8098 Single Chip Microcomputer in an OpticaI Fibre Pred uction Line

Cao ChangXiu , Yang Yinglin

1994, 17(4):79-84.

[Abstract](404) [HTML](0) [PDF 243.72 K](223)

Abstract:
A winding and rowing microcomputer controller is proposed to be applied in an optical fibre preduction line. This controller consists of 8 09 8 single chip microcomputer.With trac-ing the linear velocity of d rivin g m otor,m edulating optical fibre tension with PLD and calculating layers of optical fibre. The controller automatically medulates the speed of winding and rowin8 step motors.

16 The Method of Lmproving the Ln-Sin Measurement Lnstruments Positioning Precision for Large-Scale Gears

Liao Nianzhao , Wang DainuaFu Xiaoying

1994, 17(4):85-89.

[Abstract](602) [HTML](0) [PDF 189.66 K](173)

Abstract:
通过建立定位球的直径与定位球同齿廓在切点的端面压力角之间的超越方程得到定位球直径一齿轮轴心之间的位置关系，通过建立补偿定位球的几何尺寸偏差和齿轮齿厚偏差的数学模型得到定位球的精确定位关系，从而提出大型齿轮在位测量仪器的定位精度。分析了定位精度的影响因素及定位球适用的模数范围。

17 The Study of Flammable Harmfuf Wastes Used as the Substifute Fuel in Cement Production

Xion g Wenqiang , Yan Guang , Liu Chao , Chen Wanzhi , Qu Chaoshu

1994, 17(4):90-95.

[Abstract](566) [HTML](0) [PDF 317.13 K](199)

Abstract:
The discussion was made for research Conditions on flam mable harm ful wastes ued as the substifute fuel in cement production. The con clusion shows that this way is successful in energy saving and cost reduction,and it can be benifialin resource recovery and an effective way for cen tral dispOsal of regional flammable harmful wastes.

18 A Study Raising the Grade of Silico-titanium Ferroalloy

Li Zushu , Xu Chushao

1994, 17(4):96-103.

[Abstract](628) [HTML](0) [PDF 345.96 K](261)

Abstract:
It is studied in this paper that the influences of various factors,such as the smelting temperature,the basicity of the slag,and the quantity of reductant on the titanium content of alloy,silicon content of alloy,TiO2 content of the remaining slag and the titanium recovery in smelting silico-itanium ferroalloy using silicoaluminium ferroalloy as reductant.With this study,the optimum techn ological parameters are obtained of raising the titanium content of alloy and re-$$$ucing the silicon content of alloy. The stable experiments in laboratory and factory using this opti-mum technological parameters are conducted.

19 An Expert System for the Diagnose of peripheral Nerovus Conduction

Wang Yong , Gu Yuansheng , Zhou Ming

1994, 17(4):104-109.

[Abstract](427) [HTML](0) [PDF 299.03 K](229)

Abstract:
To promote automation of diagnoses for the pherpheral nervous conduction,byartificial in telligence technique,an expert system of diagnose is formed. This expert system is madefrom the experiences of the soecialists in the field,which constitute the rcasoning rules and k nowl-edge-based of the system,and the database managemnt system.The tests show that the efficiencyand correctness are obviously improved.

20 Analysis of the Caauses for "Orange Peel"-Shaped Defects

Zhang Deyi , Lu Lihua

1994, 17(4):110-114.

[Abstract](372) [HTML](0) [PDF 246.52 K](218)

Abstract:
研究了挤压不锈钢管时产生“桔皮”状缺陷的形成机理，其要点为：润滑剂使用不当或其它原因造成挤压时变形金属流动的严重不均所形成的附加拉应力与变形之基本应力相叠架，当接触表面处拉应力超过该处金属之强度极限时，则由缩颈而发展到微裂纹产生→裂纹扩展→裂纹钝化（应力松弛）→产生二次微型纹……，发展而形成“桔皮状”缺陷，其内因是钢材基体组织性能不均匀或微量元素及有害元素富集，在高温条件下局部区域塑性下降，抗剪强

21 Optimization of Ploymerization Condition of Long-Chain Polyammoniumphosphate

Zhao Jiafeng , Chen Zhan , Jiang Dejun , Shen Bo

1994, 17(4):115-118.

[Abstract](633) [HTML](0) [PDF 163.40 K](175)

Abstract:
In this paper,the polymerization conditions of long-chain polyam moni-umphosphate have been optimized. The polymerkation degree of pruducts has been measured by the method of end group titrimetric analysis.Identifieation to the crystal phaes of preducts has beentaken with XRD.

22 The Staged Simulation Method for Power Electronics Circuits

Llao Changchu

1994, 17(4):119-124.

[Abstract](632) [HTML](0) [PDF 228.82 K](195)

Abstract:
This paper in troduces a staged simulation method fur power electronics circuits,presents an exampleued the method for the CSI/IM drive system.

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