Volume 17,Issue 2,1994 Table of Contents

1 Study on Computer 3D-Reconstruction Algorithm of the Contour Points Matching Interpolation for Serial Cross Images

Zhang Shuangten , Zhang Taiyi

1994, 17(2):1-5.

[Abstract](633) [HTML](0) [PDF 252.04 K](1033)

Abstract:
A computer 3D-reconstruction algorithm was proposed for serial cross images,which is called contour points matching interpolation algorithm. The intermediate contours betweentwo neighbouring contours are preduced by contour points matching interpolation to form 3D-shapeof the reconstructed object. This algorithm is simple and can be easily implemented. Its advantagesare fast speed and strong adaptability for medical serial cross images 3D-reconstruction. Experi-ments show that the results are satisfactory.

2 A New Algorithm for Open Conductor Faults in Power Systems with Variable Structures

Lu Feipeng , Mi Linshu , Jiang Kexun

1994, 17(2):6-11.

[Abstract](631) [HTML](0) [PDF 255.68 K](827)

Abstract:
A new method to calculate electric values of unsymmetrical open conductorfaults in power systems with variable structures and parameters is proposed. All the fault componentsof nodal voltage or branch current and the equivalent parameters of open port for each sequence net-work can be obtained rapidly. The method presented here is much more understandable in contrast tothose available, and meanwhile the amount of calculations is greatly reduced. Its effectiveness hasbeen verified by numerical examples.

3 Parameter Calculation and Control of Active Power Filter

Luo Shiguo , Hou Zhencheng

1994, 17(2):12-16.

[Abstract](696) [HTML](0) [PDF 212.84 K](914)

Abstract:
研究了使用有源电力滤波器消除电网畸变电流的问题，分析了输出电流跟踪控制误差对补偿性能的影响，推导了参数的近似计算公式，提出了解决补偿电流时延问题的一种新的控制方法。通过实验证实了该滤波器的有效性。

4 Experimental Investigation to Nonproportional Cyclic Plasticity of 40CrA steel

Peng Xianghe , Gao Zhihui , Ma Mingtu , Yan Zaixian

1994, 17(2):17-25.

[Abstract](655) [HTML](0) [PDF 451.14 K](664)

Abstract:
采用ＭＴＳ材料试验机对正火状态的４０ＣｒＡ钢在二维循环复杂应变路径下的流动特性和强化进行了系统的实验研究。对于特定的循环应变路径，当应变幅值较小时，材料多表现为循环弱化；随着应变幅值的增加，循环弱化的现象逐渐消失，在某些路径下甚至表现为循环强化。当从一种比例路径下的循环稳定状态进入另一种比例路径下循环时，存在瞬时附加强化并随之产生缓慢的弱化。在非比例循环加载条件下，材料的强化与路径形状密切相关。不

5 Analyses of XN-1300ICT Computer System Reliability

Jiang Lijun , Xu Wengzi

1994, 17(2):26-32.

[Abstract](856) [HTML](0) [PDF 330.41 K](822)

Abstract:
比较了国内外ＣＴ的计算机体系结构；针对我国首台γ射线工业ＣＴ（ＸＮ－１３００ＩＣＴ）的计算机体系的可靠性进行了分析；同时从提高可靠度及系统连续运行时间的角度出发，提出了确定计算机体系内备件配置量的方法。

6 A Study of Application of a New Non-Linear Load Model in LFC

Zhu Jizhong , Xu Guoyu , Zhang Yiming

1994, 17(2):33-37.

[Abstract](602) [HTML](0) [PDF 246.33 K](876)

Abstract:
A decentralized load frequency control(LFC)of power system was designedwith the help of the overlapping information methed of the large-seale system theory. The effects ofa non-linear load model to load frequency control were discussed. And got some valued reference concluson.

7 A Synchro-Solution Method for Generalized Eigenproblem and its Application in Parameter Sensitivity Analysis

Huang Wenzen

1994, 17(2):46-51.

[Abstract](462) [HTML](0) [PDF 223.17 K](835)

Abstract:
A high efficient synchro-solution method for generalized eigenproblem has beenproposed ,it has also been demonstrated that how the method can be used in vibration parameter sen-sitivity analysis of the higher order non-self-adjoint vibration system such as rotor-journal bearing system.

8 The Mathematical Programming Methods of Benefit Analysis for Exploration and Exploitution of Petroleum-Gas Fields

Quan Liwei

1994, 17(2):58-66.

[Abstract](470) [HTML](0) [PDF 290.34 K](747)

Abstract:
建立了油、气田勘探开发效益分析的数学规划模型及与勘探开发有关的“快打快放”定理（当物价上涨率大于或等于年复利北时）和“快放”定理（当物价上涨率小于年复利率时）；最后，用构造性方法，证明了油、气田勘探开发的数学规划模型解的存在定理。

9 Unsteady Natural Convection Heat Transfer in Open Cavities

Lin chengxian , Xin Mingdao

1994, 17(2):67-71.

[Abstract](705) [HTML](0) [PDF 253.23 K](125)

Abstract:
对后壁受热的二维开口方形空腔中的非稳态湍流的自然对流传热进行了数值研究。采用低Ｒｅｙｎｏｌｄｓ数ｋ－ε双方程湍流模型，给出并讨论了空腔非稳态流动过程中典型的流型、温度场和开口特性。依据物理本质，对空腔传热随时间演变的整个过程进行了划分和分析。

10 Experimental Investigation on Gasitication of Industrial Briquette

Shen Jiqun , Chen Renhui , Xu Bo

1994, 17(2):72-77.

[Abstract](660) [HTML](0) [PDF 295.65 K](165)

Abstract:
In this paper,the discussion is qiven to the makeup method,the manufacturingtechnique and the gasification test results of industrial briquette.The various factors in fluencing onthe strength of gaslfying briquette are analysed,and the optimum parameters of briquetting processare obtained. The anthracite briquette manufactured is tested in the simulating gas generator. Theresults show it is of benefits of higher gasifieation strength and efficiency,lower cost,and wiuer re-sou rce to prOdu ce the gas with the industrial briquette as com pared with the same quality lump coal.

11 Correction of Fe-rich Solidus in the Fe-based Binary Equilibrim Diagram According fo the Fe Melting Heat

Wei Qingchen

1994, 17(2):78-82.

[Abstract](734) [HTML](0) [PDF 198.77 K](181)

Abstract:
According to the dada of the iron melting hcat,correction was made to thesolidus of iron and alloy element binary phase diagram in the rich iron end,and according to the ra-tio of slope of corrected solidus and slopo of liquidus,evaluation was given to the corrected distribu-tion rate of allov element in the solid and liquid phase, This rate was close to that got by chipman.

12 The Link Group Kinematic Restrait of High Order Kinematic Synthesis for a Plane Linkage Mechanism

Huang Maolin , Liu Yi

1994, 17(2):89-94.

[Abstract](709) [HTML](0) [PDF 282.31 K](96)

Abstract:
针对４－６杆及部分８杆机构，提出了统一按《３杆组》进行尺寸综合的一般方法，建立了函数发生器按０－２阶运动参数、轨迹发生器按曲率进行综合的一般方程，并探讨了各中间杆未知运动参数的性质及其处理原则。

13 Study on Temperature Fiele of Cast Iron Compound Roll in Slab Hot Rolling

Wang Linyun , Luo Shaomins , Huang Guangjie

1994, 17(2):95-100.

[Abstract](691) [HTML](0) [PDF 263.36 K](122)

Abstract:
In this paper,a finite element method coupling thermo-elasticity is used to ana-lyze the temperature field of cast iron compund roll in hot rollin8 slab mill.A technique to deal withthe bou ndary of heat and load in rotation is developed.

14 Matrix Basic Theorem and Its Application of Tvs

Fu Qiang

1994, 17(2):101-104.

[Abstract](751) [HTML](0) [PDF 155.26 K](123)

Abstract:
The matrlx basic theorem in normed linear spaces is extended to topological vec-tor spaces,by using it we also proved some important results of funcational analysis.

15 The Criterion Tor Shear Strength of Discontionuties with Different Rock Properties in Rock Mass

He Jianming , wu Gang

1994, 17(2):105-110.

[Abstract](713) [HTML](0) [PDF 264.81 K](144)

Abstract:
In this paper,with shear device, shear test of discontinuties with different rockproporties in rock mass under various surface roughness and different normal stress is investigated,the com mon shear strangth criterion of discontin uties is set up as follows.

16 The Study of the Shear Elastieity Experiment on Rat''''s Aorta

Li Haiyun , Wang Gongrui

1994, 17(2):111-113.

[Abstract](469) [HTML](0) [PDF 122.01 K](80)

Abstract:
It deseribes the shear elasticity of the rat's aorta and the shear modulus of therat's aorta was determined by the testin g device in d ifferent conditions. The relationship of the dif-ferent inner pressu re of vessel and the shear modulushas been determined.A nd the effect of(NA)on the shear modulus was also dealt with .Some cuvveqL wete obtained too.

17 Reserach on the Die Forging CAD System of Long Shaft Type Forgings

Zhou Jie , Zhu Xianwei , Ma zaibin Ynan Canlun , Liu Feng

1994, 17(2):114-118.

[Abstract](689) [HTML](0) [PDF 255.37 K](86)

Abstract:
This paper,by using AutoCAD Advanced Modeling Extension(AME),solvesthe difficulty of three-dimensional solid object modeling of forging die CAD on a porsonal computer,sets up the die forging CAD system(DFCAD system)of long shaft type forgings. It is convenient todesign die forging processes and forging dies , and can get 3-D and 2-D forging die drawings.

18 Analysis and Study to Static and Dynamic Characterisstics for a Digital Speed Control Valve Made in Japan

Jia Pengguang , Lu Weihua

1994, 17(2):119-125.

[Abstract](768) [HTML](0) [PDF 289.30 K](930)

Abstract:
n this paper,researches of digital valves in Japan in recent years are briefly de-scribed. The operation principles and the structure of a new digital speed control valve are analysed.This new valve is made by Japanese Tokyokeiki company. Based on these investigations , theoretiealanalysis,degital simulation and experimental study are emphasized to the valve's static and dynamiccharacteristics.

19 The Volume Shrinkage Characteristics of Porous Materials During Drying Process

Li Youyong , Jin Mingcong , Chen Yuanqiang , Tan Jingwen

1994, 17(2):136-140.

[Abstract](587) [HTML](0) [PDF 241.41 K](1196)

Abstract:
In this paper,elementary mechanism and experimental results are analysed onthe volume shrin kage characteristics of the wet porous eapillary materials during drying process. Atthe same time, the influence is discussed of mean pore radius and solid matrix strength of the wetporous material,as well as the temperature and velocity of hot air on the volume shrinkage rate onthe basis of the experimental results.

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