Volume 17,Issue 6,1994 Table of Contents

1 The Development of Dynamic Measuring Instrument for Checking Lead Errors of Ball Screws of Steering Mechanism

Chen Ji , Yang Shixiong , Xiao Sali , Yu Hong

1994, 17(6):8-14.

[Abstract](541) [HTML](0) [PDF 341.83 K](234)

Abstract:
A new type of measuring instrument which is used to measure lead errors of ballscrews has been developed. The principle of the inStrument,the system strucrure,the computer inter-face. The analyses of the instrument error and the experimental results are presented, The principleof comparing synchronous displacement is used to achieve absolute measurement. The errors correc-tion technique is adopted to correct the errors of the instrument so that the high measuring accuracycan be botained.

2 Computation of Three-Dimensional Temperature Distribution and Thermal Analysis to Integrated Circuit Substrates

Ding Xiaojian , Xin Mindao , Chen Weiyun

1994, 17(6):19-23.

[Abstract](425) [HTML](0) [PDF 300.05 K](134)

Abstract:
The exact three di me nsional temperatu re distribution and thermal analysiS to inte-grated circuit substrates have been presen ted by means of numerical method of a fin ite difference.Thismethed.which will overcome the di fficuItv of mathematical deduction mav be consltieredas an analytical way aided by com puters for thermal design of electron ic compon ents.

3 Calculation and Measurement of Electric Field along Polluted Cylindrical Insulator

Zhang Jianhui , Gu Leguan , Su Caixin , Xu Guoyu

1994, 17(6):24-29.

[Abstract](721) [HTML](0) [PDF 293.06 K](111)

Abstract:
In this paper,the electrical field distribution along the polluted cylindrical insu-lator before a nd after the local a re appea rs is calculated with the optim lzed pa rtially cha rge simula-tinn method and measured with the pockels device. Based on the calculating and measuring results,the in fluen ce of the electric field distri bu tion on the propagation of local a re in the flashover ofcyIlndrical insufator under various conditions is analyzed systematieally.

4 Principle of Measurement on line with Computer for MOA

Tang Ju , Sun Caixin , Liao Ruijin , Chen Mingying

1994, 17(6):30-35.

[Abstract](595) [HTML](0) [PDF 275.12 K](150)

Abstract:
阐明了区分氧化锌避雷器性能不降的原因，介绍了一种应用单片计算机和配套的软件系统构成的氧化锌避雷器阻性电流在线测试仪，通过实验室和现场测试结果表明：在信号采集、处理和抗电磁干扰能力方面具有优良的特性，且能较灵敏地反映阻性电流的高次谐波分量，同时，还介绍了一种只从氧化锌避雷器取信号测量阻性电流的新方法。

5 Simulation Investigation for the Regulating Characteristics of Real and Reactive Power of Asynchronized Turbogenerators

Ling Zhixians , Yang Shunchang , Qing Yihong , Xu Guoyu

1994, 17(6):36-42.

[Abstract](791) [HTML](0) [PDF 291.36 K](1683)

Abstract:
This paper discuas the controlling principle of asynchronized turbogenerators,deduces their mathematical model,and studies their regulating characteristics of real and reactive power(or voltage)by means of simulation calculation of operating characteristics for a 200MW asychronlzed turbogenerator.The conclusion is that the asychronlzed tubogenerators not only can regulate real and reactive power independently but also has an excellent dynamic performance.

6 The Extraction Technique of the Cell Wall Polysaccharid es from Beer Yeast

Liu Langxin , Cheng Zongdao , Wang Guangci , Tian Ye

1994, 17(6):43-48.

[Abstract](581) [HTML](0) [PDF 271.28 K](1162)

Abstract:
提出了一个从啤酒厂主要副产物－废酵母泥中制备胞壁多糖的新工艺。该工艺主要包括自，机械破碎，碱溶，中和，沉淀等工序，碱溶工序的最佳工艺条件为：按５：１（碱液体积ＭＬ：酵终胞壁湿重ｇ）比例加入２％的ＫＯＨ溶液，煮沸浸提１．５ｈ。在实验室规模下，在各工艺参数优化时，胞壁多糖得率为１０％，相对纯度达８３％，层析表明，组成胞壁多糖基本单位为甘露糖和葡萄糖。

7 An Exploration of the Feasibility on Evaluating Performances of Tool Steels in Terms of Deformation Work by the Method of Hot Torsion

Zhang Deyi , Lu Lihua , Liu Rongyun

1994, 17(6):53-59.

[Abstract](456) [HTML](0) [PDF 297.43 K](865)

Abstract:
论述了一种与刃具使用时受力状态相似的衡量工具钢使用性能的实验方法－热扭转法。其特点是用热扭转时之弹性变形功，弹塑形变形功来衡量和评价工具钢的使用性能。

8 The Algorithm of Pole-Assignment Self Tuning Robust Control

Yang Yongzhen , Wang Zhiho

1994, 17(6):60-66.

[Abstract](615) [HTML](0) [PDF 294.46 K](984)

Abstract:
An control algorithm with goed robustness has been developed,based on the combination of poletassignment self- tuning control algorithm with robust estimation and control al-gorithms,while the input signal and process parameters are varied on a large scale. The design of controller based on presented algorithm is simple,with good robustness for parameter changes and a strong ability for overcoming determined disturbance.The simulating research results proved the ef-fectiveness of the pole- assienment self-tuning robust control algorithm.

9 Effect of Cobalt Ion Implantation on Behavior of Ni(OH)_2/NiOOH Electrode

Zhang Shengtao , Huang Zongqing

1994, 17(6):74-77.

[Abstract](469) [HTML](0) [PDF 208.16 K](1374)

Abstract:
Clectrochemial reaction occurred on Ni(OH)2/NiOOH electrode was studied with electrochemical method and ellipsometry with wavelength sweep.Cobalt was implanted intosurface of nickel with fonim plantation technology to improve charge efficiency of the electrode. With fitting ellipemetric experimental data,transformation model of the surface film was obtainedduring charge and discharge. Implantation of cobalt did not affect the model,but made charge effi-ciency be increased.

10 Fracture Characteristics of Brittle Material with Pre-crack under Compression

Wan Ling , Xu Jiang , Yin Guangzhi , Li He

1994, 17(6):78-82.

[Abstract](680) [HTML](0) [PDF 228.77 K](973)

Abstract:
利用矿相显微镜和与之配套使用的微型加载装置，对预制裂纹脆性材料的断裂特性进行了研究，得出了在单轴及双轴应力作用下Ｋ１－Ｋ１的变化关系：Ｋ１／Ｋｌｃ＝８．６７×１０＾－７（Ｋ１／Ｋｌｃ）＾２－０．８４Ｋ１／Ｋ１ｃ＋１．９４×１０＾４和Ｋ１／Ｋ１ｃ＝１．５６×１０＾－６（Ｋ１／Ｋ１ｃ）＾２－２．９５Ｋ１／Ｋ１ｃ＋４．７０×１０＾６，并与理论结果进行了对比，此外还得出了开裂角θ与裂纹倾角β的关系：θ＝６

11 Forced Vibrad0ns of the Nth-Order Linear Neutral Dealy Differential Equations with Real Constant Coefficients

Zhou Jin , Chen Junping

1994, 17(6):83-88.

[Abstract](447) [HTML](0) [PDF 237.11 K](1084)

Abstract:
In this paper,we make an attempt to study forced vibrations of the nth-order linear neutral delay differential equations with real constant coefficients. Sufficient and necessary conditions of the existence and uniqueness of periodic solutions for the equations are obtained by use of theory of Pourier series. Furthmore ,some brief and practical critiria are given.

12 A Development of The High Density Metrological Radial Grating

Yu Honglin

1994, 17(6):89-93.

[Abstract](511) [HTML](0) [PDF 212.56 K](149)

Abstract:
在高精度圆刻线机上，采用了新的高精度主轴转速数字锁相自调系统，设计了一种新型柱面“蜂窝”透镜光刻系统。研制出刻划中径≤５０ｍｍ，刻线数为３２７６８线对的高密度计量圆光栅，最大直径误差≤０．６″，均匀性误差在５％以内。

13 Study on the Production Procedure to Reduce the Earing Ratio of 8011H18 Aluminium Alloy for Deep Drawing

Wang Lingyun , Huang Guangjie , Luo Shaoming

1994, 17(6):98-102.

[Abstract](664) [HTML](0) [PDF 227.11 K](151)

Abstract:
In this paper,the preduction procedure of 8011H18 Aluminiufn alloy is designedby the means of orthogonal method. The production procedure exporiments were made according tothe designed procedure and the mechanical properties were tested. The changes of microstructure inproduction procedure were in vestigated with microscope. The optimal preduction procedure of8011H18 Aluminium alloy is developed,and the anti-theft cap material with fine deep drawing pro-cessabilivand low earing ration has been successfully produced. The earing ratio of the material de-creases from 5%to about 2%and the finished product ratio increases from 86%to about 96%,The mechanism of property improvement and caring ratio reduction of new production procedure has becn also discussed.

14 The Method of Measuring twisting moment andRotative Velocity with Microcomputer and Its Application

Li Yongjian , Sie Ming , Ding Kang , Wnang Yanchun

1994, 17(6):108-112.

[Abstract](437) [HTML](0) [PDF 241.79 K](130)

Abstract:
论述了一种微机测量转矩和转速的原理与方法，利用微机的时钟脉冲研制出一种精度达微秒级的时种，用此时钟测量转矩的误差小于１％，测量转速的误差小于１‰；在实际应用中提出了解决现场信号不稳定的两种测量方法，即周期计数和定时截取的测量方法。

15 Research Progress in HSAB Theory and Leather Chemistry

Wang Yuanliang

1994, 17(6):113-118.

[Abstract](527) [HTML](0) [PDF 299.55 K](114)

Abstract:
The progress of applying HSAB theory to leather chemistry was reviewed.The stability and the tanning property of hydroxo complexes and the dechroming from leather shavings were expounded according to the absolute hardness from density-fu nctional theory and the softness from the theory of the mutual perturbation of the frontier- controfled molecular orbitals,The concept of accumulative propery of hydroxo compounds was posed as well. Finally,the future in this field was looked into.

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