Volume 21,Issue 4,1998 Table of Contents

1 Study on Field Emission Array Integrated Vacuum Micro Electron Tactile Sensor

Wen Zhiyu He Qingyi Jiang Yongqing Lin Peng Jiang Ziping

1998, 21(4). DOI: 10.11835/j.issn.1000-582X.1998.04.001

[Abstract](750) [HTML](0) [PDF 224.95 K](720)

Abstract:
阐述了真空微电子触觉传感器的工作原理。采用半导体集成电路加工技术和硅微各向异性腐蚀及氧化锐化工艺，在电阻率为３～５Ω·ｃｍ的ｎ型（１００）硅片上制备了真空微电子触觉传感器的场致发射阴极锥尖阵列，锥尖密度达３９００个／ｍｍ２，起始发射电压为２～３Ｖ，反向击穿电压大于３０Ｖ，收集极在２０Ｖ在电压时，单尖发射电流达０．２μＡ，实验结果表明这种真空微电子触觉传感器具有良好的触觉效应。

2 Evolutionary Programming Solution of Economic Dispatch with Valve Point Loading

Shi Libao Xu Guoyu Feng Qiang

1998, 21(4). DOI: 10.11835/j.issn.1000-582X.1998.04.002

[Abstract](756) [HTML](0) [PDF 297.38 K](835)

Abstract:
This paper describes an application of evolutionary programming (EP) to economic dispatch with valve point loading.Some technical problems (representations of candidate solutions,evaluation function,mutation operator) have been solved to expand the applica be prospects of the computatimal methods of economic dispatch.The proposal method is applied to a 6 bus 3 generator system and compared with the genetic algorithm(GA).Numerical results demonstrate the validity and effectiveness.

3 X-ray Diffraction Analysis of the 25Cr2MoVA Steel After Rapid Ion Nitriding

Zhou Shangqi Ren Qin Fan Qinlin

1998, 21(4). DOI: 10.11835/j.issn.1000-582X.1998.04.003

[Abstract](587) [HTML](0) [PDF 210.49 K](930)

Abstract:
The surface phase constituent of the 25Cr2MoVA steel has been analysed after conventional and rapid ion nitridings.The relation between the tempered temperature and the phase constituent has been investigated.

4 Some Properties and Model of the Efficient Margin in Portfolio Combinatorial Investment

Liu Xibiao Yi Hengyun

1998, 21(4). DOI: 10.11835/j.issn.1000-582X.1998.04.004

[Abstract](505) [HTML](0) [PDF 0.00 Byte](0)

Abstract:
This paper proves some properties of the efficient margin in portfolio combinatorial investment and presents a methematical model for calculating the optimal weighted vector of portfolio combinatorial investment

5 Analysis of Kinematic and Kinetic Characteristics of a Metal Pushing V Belt CVT

Sun Dongye Qin Datong Yang Yalian

1998, 21(4):1-6. DOI: 10.11835/j.issn.1000-582X.1998.04.005

[Abstract](684) [HTML](0) [PDF 264.21 K](891)

Abstract:
Based on the kinematic and kinetic characteristics, the friction model of a metal pushing V(belt continuously variable transmission (CVT) is established in this paper. The relation between applied forces and speed ratio as well as transmitted torque is analysed. The coputational formulas on the tension forces of steel ring and compression forces between metal blocks are derived. The theoretical bases for designing a metal pushing V belt CVT equipment and its control system are provided.

6 The Application of Fuzzy Neural Network in the Detection for Moving Object

Yan Ping Yi Runzhong Liu Fei Ma Zujun

1998, 21(4):7-11. DOI: 10.11835/j.issn.1000-582X.1998.04.006

[Abstract](693) [HTML](0) [PDF 229.52 K](107)

Abstract:
A fuzzy neural network(FNN) of detection for moving object based on BP algorithm is described in this paper.The correctness of the FNN in signal detection for moving object and fault diagnosis for instrument is proved by experiments.

7 An New Hybrid Model of Qualitative Diagnostic Reasoning

Rong Mei Zhang Guangquan Shen Yidong

1998, 21(4):17-22. DOI: 10.11835/j.issn.1000-582X.1998.04.008

[Abstract](601) [HTML](0) [PDF 272.39 K](134)

Abstract:
Two main approaches are used in qualitative diagnostic reasoning.These approaches are the first principle approach and the heuristic knowledge approach.Systems based on the first one can handle hard problems and new situation.On the other hand,systems based on the second perform diagnostic tasks faster but can deal only with the most common problem cases.This paper provides a model using both the deep and shallow knowledges, and presents some algorithms.

8 Theoretical Analysis and Design of Resonant DC Base High Frequency Inverter

Lu zhiguo Hou zhencheng

1998, 21(4):23-28. DOI: 10.11835/j.issn.1000-582X.1998.04.009

[Abstract](816) [HTML](0) [PDF 219.29 K](102)

Abstract:
A theoretical analysis of the Resonant DC Base High Frequency Inverter is given. A optimal control scheme for the short circuit current of the resonant inductor is proposed. The system parameters,output current,output voltage and characteristics of the Resonant DC Base in this scheme are analysed. In the theoretical analysis the load is supposed as a resistor to void the calculating error while the load is treated as a constant current source. The analysis and test result have proved that the optimal parameters of the Resonant DC are only determined by the load resistance and the output frequency.

9 A Study on the MAG Welding of 18MnMoNb Steel

Xu Xiangguo

1998, 21(4):29-33. DOI: 10.11835/j.issn.1000-582X.1998.04.010

[Abstract](558) [HTML](0) [PDF 243.61 K](115)

Abstract:
试验研究了混合气体保护焊焊接１８ＭｎＭｏＮｂ钢时，在Ａｒ中加入２％￣４％Ｏ２后，对电弧稳定性、短路过渡、焊丝熔化速度及焊缝成形的影响。

10 Application of fuzzy Neural Networks to Evaluation of Transversal Economic Benefits

Dong Jingrong Yang Xiutai

1998, 21(4):34-38. DOI: 10.11835/j.issn.1000-582X.1998.04.011

[Abstract](742) [HTML](0) [PDF 235.51 K](122)

Abstract:
A new method for evaluation of transversal economic benefits is researched by fuzzy neural networks, BP algorithm is used to learn the connection weights of the fuzzy neural networks and partitions of fuzzy subsets. It has been shown by the modeling and evaluating results about the economic benefit index system of ten enterprises that the method has reinforcement learning properties and universalized capabilities. with respect to modeling and evaluating of nonlinear systems which have some uncertainties, the method is available.

11 Anti interference Study of Differential Coil for Measuring Fast High Current Impulse

Liao Ruijin Sun Caixin Gu Leguan Lu Shenghe

1998, 21(4):44-48. DOI: 10.11835/j.issn.1000-582X.1998.04.013

[Abstract](502) [HTML](0) [PDF 223.10 K](100)

Abstract:
The problem that the internal electrical interference is nuavoidable for differential coil in measuring fast high current impulse is discussed.The shielded differential coil which has a chink in the middle of its shield can reduce this interference,and that the signal to noise ratio of the differential measurement is 27 shows the anti interference efficiency of this coil.Furthermore,the double differential coil which use the differential balanced technique to resisting the interference make the signal to noise ratio of the differential mearsurement be 57.

12 Simulation Modeling and Simulation Analysis for the Boiler Attached to 360 MW Unit

Ding Li Tang Shengli Yang Chen He Zhiwei

1998, 21(4):55-60. DOI: 10.11835/j.issn.1000-582X.1998.04.015

[Abstract](696) [HTML](0) [PDF 261.01 K](180)

Abstract:
Using modular simulation technique,a mathematical model for the combustion and air/gas system of the W shape flame boiler is presented.The experimental resulats show that.The dynamic process accords with the mechanism process of the object.

13 The Modeling of Decision Making Mapping Models for Manufacturing by the Fractal Theory

Sun Dihua Liu Weining Liu Fei

1998, 21(4):73-78. DOI: 10.11835/j.issn.1000-582X.1998.04.018

[Abstract](685) [HTML](0) [PDF 308.24 K](959)

Abstract:
Based on the fundamental principle of the fractal theory, the fractal characteristics of the decision making mapping model for manufacturing and its modeling process are discussed. The principle of modeling for defcision-making mapping models by the fractal theory is proposed.

14 A Solid Modeling and Geometric Analysis of Hourglass Worm Gearing

Qin Dongxing Qin Datong Shi Wankai

1998, 21(4):79-83. DOI: 10.11835/j.issn.1000-582X.1998.04.019

[Abstract](837) [HTML](0) [PDF 216.63 K](149)

Abstract:
Based on the theory of conjugate surface and computer graphics, a solid modeling method of hourglass worm gearing is presented. Assembly simulation of worm gearing is carried out, clearance and interference between meshing tooth surfaces are analyzed, and effects of machining and modification of assembling parameters on meshing and contact between tooth surfaces are investigated.

15 Using the Finite Element Method to Predict the Dispersed Shrinkage and Hot Tearing of the Pump Shell Castings

Li Huaji Li Gesheng Zhang Rong Zhen Bingren

1998, 21(4):84-89. DOI: 10.11835/j.issn.1000-582X.1998.04.020

[Abstract](579) [HTML](0) [PDF 254.37 K](161)

Abstract:
This paper has simulated numerically the 2D temperature field and stress field of main circle pump shell steel castings of nuclear power plant by finite element method,predicts the dispersed shrinkage,shrindage and hot hearing.The real dissecting pouring castings had the same results as the numerical simulation.At the same time the authors evaluat the molding design of the pump shell castings.

16 The Model and Algorithm of Capacity Balance

Yan Ping Wang Zhijie Zhao Xianyuan Liu Fei

1998, 21(4):90-93. DOI: 10.11835/j.issn.1000-582X.1998.04.021

[Abstract](1216) [HTML](0) [PDF 169.76 K](109)

Abstract:
In this paper,more carefully study has been discussed to the traditional MRP capacity cutting method ,the default is found. The optimizing thought is introduced in capacity cutting .A mathematical model of this problem is established . Base on this model, a new scheduling algorithm is put forward.

17 Present Research Progress of Active Vibration Control for High rise and Flexible Civil Infrastructures

Wang Daihua Huang Shanglian

1998, 21(4):94-98. DOI: 10.11835/j.issn.1000-582X.1998.04.022

[Abstract](593) [HTML](0) [PDF 307.58 K](164)

Abstract:
The necessity,basic concepts and its key techniques of active vibration control for high rise and flexible civil infrastructures are expounded and the current research situation and its problems that still existed are introduced,and it is pointed out that making structures smart/intelligent is a new important way to ensure the structures safe and durable.

18 New Development of Transmission Researches about Optical Solitons in Optical Fiber Telecommunication Systems

Duan Shaoguang

1998, 21(4):99-104. DOI: 10.11835/j.issn.1000-582X.1998.04.023

[Abstract](782) [HTML](0) [PDF 351.32 K](142)

Abstract:
This paper prieseuts comprehensively new development of transmission researches about the optical solitons in optical fiber tele communication systems abroad,including:1.N soliton interaction in optical fiber;2.pulse propagation in the fiber;3.the femtosecond soliton soliton interaction in dispersion shifted fiber;4.strongly coupled nonlinear parametric solitary waves;5.higher order effects in bandwidth limited soliton propagation in optical fibers;6.suppression of noise accumulation in band width limited soliton transmission by means of nonlinear loop mirrors.

19 The Management Techniques of Distance Education and Its Implementation

Wu Zhongfu Fu Yunqing Wang Kang Li Hua

1998, 21(4):105-110. DOI: 10.11835/j.issn.1000-582X.1998.04.024

[Abstract](817) [HTML](0) [PDF 304.44 K](1004)

Abstract:
The education modes and contents involved in the management of distance education are first analyzed in the paper, and the preliminary implementation based on CERNET and Internet is followed. The techniques of WWW servers efficient access to database and system security are presented in addition.

20 The Influence of the Arrangements of Pipes on Gas solid Flow Characteristics in the Dense Section of the Stand Pipe

Liao Shujiang Lu Xiaofeng

1998, 21(4):111-116. DOI: 10.11835/j.issn.1000-582X.1998.04.025

[Abstract](729) [HTML](0) [PDF 266.98 K](1033)

Abstract:
The influence of the arrangements of pipes on gas solid flow characteristics in the dense section of standpipe in the circulating fluidized bed is studied on a cold state experiment platform.The influence relationships of the percentage of area of pipes in the standpipe cross section and section shape of pipes and the circulation rate,adjusting range and distribution percentage of loose air are studied emphasizedly.

21 Abstraction of the Characteristic Knowledge in the Distillator Operation Process

Shi Weiren Liang Shan Xie Zhaoli

1998, 21(4):117-122. DOI: 10.11835/j.issn.1000-582X.1998.04.026

[Abstract](692) [HTML](0) [PDF 344.79 K](891)

Abstract:
The inner process of the distillator is a multimode dynamic process.To a great extent quality of the spirits depends on operation of the distillation.On the basis of studying spirits distillation principle the authors,propose an ideal of using inner temperature in canonical operation circumstances as the descriptive language of expert knowledges in the domain of the spiritis distillator.

22 An Optimal Combinatorial Forecast Method in for Future Profit of Assets

Zhong Bo Xiao Zhi

1998, 21(4):123-126. DOI: 10.11835/j.issn.1000-582X.1998.04.027

[Abstract](731) [HTML](0) [PDF 172.70 K](830)

Abstract:
This paper presents an optimal combinatorial forecast method for the future profit of assets.

23 A Singular Wavefunction and Its Application to Atomic Energy Calculation

Wang Xinqiang

1998, 21(4):131-134. DOI: 10.11835/j.issn.1000-582X.1998.04.029

[Abstract](727) [HTML](0) [PDF 208.52 K](984)

Abstract:
讨论了波函数在原点的奇异性问题及其与势场的关系，指出在保证径向波函数平方可积，即积分∫│Ｒｎｌ（ｒ）│＾２ｒ＾２ｄｒ有限的前提下，出现Ｒｎｌ（０）＝∞的奇异性，在物理上是可以接受的。然后，将具有这种奇异性的波函数应用于类氦原子基态能量的计算，并通过对结果的分析指出，采用形如Ｒ０（ｒ）＝Ｃｒ＾５０ｅ－ｚ－β／１＋ｓ０（０〉ｓ０〉－１／２）的奇性径向波函数，相当于将两电子间除屏蔽效应之外的关联作用，等

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