Volume 19,Issue 1,1996 Table of Contents

1 Experimental Study on Sediment Problems of Navigation in the Course of Construction in the Three Gorges Project

Du Zongwei , Shu Ronglong

1996, 19(1):10-17.

[Abstract](491) [HTML](0) [PDF 407.44 K](100)

Abstract:
This paper introduces some resarch results on sediment model experiment of navigation in the course of construction. including the laws of erosion and deposit change of sediment in dam area,depositional configuration of sediment in the approaches of temporal ship lock, distribution and surface sea-level of deposition,speed of return deposition, volume of deposition of frustrating navigation, grain grade of deposition and the effect of deposition on navigable condition in open channel and temporal ship lock and so on. Some measures of amelioration are presented,which have important value to the construction of the project.

2 Designing Complex Shapes with NURBS

Fan Jinsong , Xu Zhongjun , Guo Gang

1996, 19(1):18-25.

[Abstract](530) [HTML](0) [PDF 380.59 K](92)

Abstract:
This article discusses the designing method of complex shapes with NURBS. The general design process of curve and surface is put forward in this paper,and the correspondent mathematical expressions and computational method are also presented. Because of the superior feature of NURBS, these methods are very suitable for constructing different kinds of shapes,and easy to use in engineering applications. Finally,the authors summarize various kinds of method of geometry design, based on NURBS.

3 A New Systematic Approach for Building State Equations

Wang Qun , Wu Ning , Geng Yunling

1996, 19(1):26-32.

[Abstract](590) [HTML](0) [PDF 311.17 K](148)

Abstract:
In this paper, the concept of hybrid variables is introduced. First hybrid equations are built and then,state equations are obtained by eliminating the redundant hybrid variables in the hybrid equations.

4 Optimal Search and Connection for Restraining Software'''' s fault based on Its Characteristics

Sun Kaibin , Sun Changan

1996, 19(1):33-39.

[Abstract](358) [HTML](0) [PDF 332.21 K](86)

Abstract:
在对软件故障特征的基础上，给出了软件可靠性预期模型；采取贮备程序的最优接通、提高操作的可靠性、强化功能设计、容错设计及抑制潜在电路等举措，并以故障最优寻找的监控策略，达到提高软件可靠性的实用效果。

5 A Self-Learing Chinese Character Recognition System

Volker Muller , Zhang Ping

1996, 19(1):40-45.

[Abstract](561) [HTML](0) [PDF 283.59 K](119)

Abstract:
A method using possibility theory and fuzzy logic is introduced. Possibility functions of each feature are determined during training. Methods of fuzzy logic are used to combine the possibility of different features. This Chinese character recognition system consists of a pre-classifier and a two-level fine classifier. In order to handle deviations of the characters,a fuzzification of features is introduced. This method is used to develop single-font classifiers. The whole system consists of a font-classifiers and four single-font-classifiers.

6 The Finite Element Computation of Stress on Type Surfaces of Three Bioprostheseis Valves

Cao Zhen , Zou Shengquan , Liao Hongyan , Zu Zhenghua

1996, 19(1):46-52.

[Abstract](543) [HTML](0) [PDF 318.53 K](129)

Abstract:
In this paper the static stress distribution of closed valve during diastole under the peak across valve pressure difference is analyzed with nonlinear finite element method. We analyzed the three shapes i. e.,spherical,cylindrical and rotating paraboloid type valves, respectively as a result of computation, it is suggested that the maximum principal normal and shearing stress for rotating paraboloid type valve are smaller than those for the cylindrical and spherical type valves. It shows that there exist some similarities of the stress distribution among these three type valves.

7 A Method of Solving the Structural Fuzzy Finite Element Equilibrium Equations

Yu Zhitao , Lu Enlin , Wang Caihua

1996, 19(1):53-58.

[Abstract](535) [HTML](0) [PDF 222.66 K](139)

Abstract:
Based on resolution of interval numbers and fuzzy resolution theorem,we develop a method of solving the structural fuzzy finite element equilibrium equations. A lot of calculations and analyses show,the method presented in this paper is correct and feasible.

8 Studies on the Structure Model of Coal and Its Polarization Characteristics

Du Yungui , Xian xuefu , Ren Zheng , Zhang Guangyang

1996, 19(1):59-63.

[Abstract](493) [HTML](0) [PDF 294.06 K](122)

Abstract:
The macromolecular structures of coal samples collected from Yutianbao, Nantong and Qingnian coal mines in Sichuan were studied and a model of structure for these coals was set up. On the basis of above mentioned work,experimental studies and theoretical analyses were made to investigate the characteristics of coal polarization in applied electric field. The results indicate that the rotation polarzation and the space polarization are the essential reason for the attenuation of electric current through coal samples,and that the space polarization is the main form of coal polarization.

9 Study of Combined Heat Transfer Enhancement with Swirl Flow Generator and Flag-Type Insents

Chen Li , Xiang Dong

1996, 19(1):64-67.

[Abstract](472) [HTML](0) [PDF 221.60 K](948)

Abstract:
实验研究了管内同时设置旋流器和旗形动态插入件时油类介质的换热及流阻特性。旋流器为长１００ｍｍ、丝径１．５ｍｍ、节距４ｍｍ的螺旋线圈。旗形件数目为１￣３片。实验表明，上述复合强化手段集中了两种元件的优点：换热系数高而阻力损失不大，且在层流区和紊流区都得到了强化。实验范围内综合判据之值高达２．７６。

10 Heat Transfer Performance of Horizontal Enhanced Condenser Tubes

Liao Qiang , Xin Mingdao

1996, 19(1):68-73.

[Abstract](658) [HTML](0) [PDF 291.10 K](1103)

Abstract:
In this paper, experimental results on heat transfer performance of a low integral-fin tube, thermoexcel-C tube (C tube) and a new horizontal double-side enhanced condenser tube (GC tube) have been reported for condensation of R-11. Within our experimental scope,the overall heat transfer coefficient of the GC tube can increase more than 5 times that of the smooth tube . And the relevant friction factor inside the GC tube can be 7 times that of the smooth tube. The Second law of thermodynamics was applied to develop a new criterion to assess the heat transfer performance of the GC tube,the C tube,the low integral-fin tube,and the DAC tube[1] (another doubleside enhanced condenser tube). The result shows the heat transfer performance of the GC tube is superior to the other tubes from a thermodynamical viewpoint.

11 An Excitative Control in Operating Process for Synchronous Motor

Huang Xiyu , Deng Renming , Zheng Wenjun , Chai Yi

1996, 19(1):74-78.

[Abstract](555) [HTML](0) [PDF 277.17 K](1501)

Abstract:
Aimed at the excitative control for synchronous motor, based on main adjust for power factor and aided adjust for power angle,a kind of new control strategy is presented in this paper. In the steady running,the excitation current will be adjusted in keep. power factor constant,and in dynamic running,it will be calibrated by means of power angle when the disturbance happened.For specified object,the improved algorithm of artificial intelligence controller is also presented in the paper,the simulation result shows that the control algorithm is satisfactory.

12 Two Optimization Methods for Portfolio Investment Decision

Liu Xing , Yang Xiutai

1996, 19(1):79-84.

[Abstract](561) [HTML](0) [PDF 296.47 K](1163)

Abstract:
On the basis of introducing some fundamental theories and computational methods of portfolio investment, this paper derives a decision model for searching optimal portfolio with the utility function. Then,after comparing the new model with the conditional extreme optimization model,which has been usually considered by people,the result shows the new model would be more efficient under certain conditions.

13 Study on the Realizing Meathod of the High Precision Real-Time Detection of the Concentration of Free State Chlorine

Pei Liujin , Deng Renming , Tang Feng

1996, 19(1):85-90.

[Abstract](476) [HTML](0) [PDF 236.68 K](888)

Abstract:
A high precision detecting method for the concentration of free state chlorine is realized in this paper, which is based on the photoeffect,compton scattering,Lambert-Beer theorem,using a novel SMM double-wavelength,double-beam spectrophotometry.

14 Investigation of an Intelligent Circular Chart Regulation Recorder

Huang Qin , Yang Tianyi

1996, 19(1):91-94.

[Abstract](505) [HTML](0) [PDF 211.60 K](1070)

Abstract:
This paper introduces the design of software and hardware for intelligent circular chart regulation recorder. A study for the on-chip development of resources of single chip micro computer is discussed deeply. The conversion and calibration were used stage by stage in measuring channel. This paper also suggests a time period drive method for preventing the task overstock.

15 The Electric Control System of Mechanical Transmission Test-bed With Mechanical Closed Cycle And Electric Colsed Cycle

Tang Zhuoyao , Shi Xiaohai , Zhang Guanghui , Wang Mingyu

1996, 19(1):95-100.

[Abstract](591) [HTML](0) [PDF 253.96 K](940)

Abstract:
This paper presented the principle and combinations of the mechanical transimssion test-bed with mechanical closed cycle and electric closed cycle. This system is composed of variable velocity driver, motor, generator, inverter and computer. It can be used both in mechanical closed cycle test-bed and electric ciooed cycle test-bed. The test-bed can keep a realting monitoring over the system and control the rotational speed and torque by computer. It can also simulate the real work condition of the test and to do the test. In this paper,the diminishable magnetization velocity modulation,invertiable control,the test data and curve,and the inverting efficiency as well as control scheme and presented.

16 Study of Larger Taper Cutting Mechanism for Wire-EDM Machine

Kuang Shitan , Yao Yongkai

1996, 19(1):101-105.

[Abstract](594) [HTML](0) [PDF 277.98 K](1487)

Abstract:
After a analyze for current taper cutting mechanism of NC wire-EDM machine,the paper but forward a new mechanism for larger taper cutting and introducted the working principle in great detail. It has been proved the new mechanism could solve many key techanical problems which current mechanisms had. The new mechanism has been patented. Newly developed NC wire-EDM,DK7725 TC,has been warmly welcome by numerous users.

17 Charge Coupled Devices Self-adaptive Circuit

Wu Fujie , Yang Zhengcai , Hou Zhencheng

1996, 19(1):106-111.

[Abstract](561) [HTML](0) [PDF 263.07 K](775)

Abstract:
The basic principle of CCD self-adaptive circuit is presented. The EPROM circulating addressing method used in the design of this circuit is discussed in great detail and the superiority of this method is given. Finally,the application area of CCD self-adaptive circuit is shown.

18 Study on Synthesis of High Quality Lactide

Wang Yuanliang , Zhao Jianhua

1996, 19(1):112-117.

[Abstract](942) [HTML](0) [PDF 301.86 K](1101)

Abstract:
Polylactide,a biodegradable polymer, is an important biomedical meaterial. The synthesis of lactide from lactic acid is the key dimer of polylactide,unevitably affacting the polymerized process and the quality. Present work improves synthesis process of lactide. The synthesized factors are discussed, the reactive time is shortened and the quality of resultant is also raised.

19 Analysis and Design of Stigmata Upsetting Die

Qiu Zhongyi , Jin Weidong , Wang Qiang

1996, 19(1):118-124.

[Abstract](409) [HTML](0) [PDF 264.65 K](118)

Abstract:
Upsetting, a typical hot deformation process, is simulated by using rigid-viscoplastic finite-element method, its instantaneous stress distribution over the interface between the die and workpiece being derived for the finishing upsetting stage. Based on these computations and in conjunction with elastic finite element method,die strength is then analysized. An optimization design for prestressed die inserts is adopted to decrease pressure being applied to the working surface of upsetting die,and in turn,to prolong its service life.

20 Recovery of Waste Glass by a Method of Water Flushing Selection

Li Xiaohong , Gao Tianling , Zheng Jinglong , Liu Ailin , Lu Yiyu

1996, 19(1):125-130.

[Abstract](427) [HTML](0) [PDF 246.21 K](149)

Abstract:
In this paper,a new method of water flushing recovery of waste glsss is presented. The equipment of separation of glass from waste materials and it' s mechanisms are described.The relationship between the efficiency of separation of glass from waste materials and the physical and mechanical properties of these waste materials is analyzed. The experimental results of recovery of waste glass are given. It is found that the efficiency of recovery of glass is more than 90%.

21 The study on Harmonic Wave Compensation Method of a SCR Regulating-Speed Control Filter Device in a Serosystem

Wan Peilin

1996, 19(1):131-135.

[Abstract](537) [HTML](0) [PDF 288.67 K](134)

Abstract:
We have studied the method of eliminating the harmonic wave of SCR regulating-speed device a servosystem and increasing its power supply unit' s loading ability when its current is large. Compared with other methods by experiment,we think the compensation method using micro-computer to auto control harmonic wave filter compensation is simpler and more practical.

22 Unique Property Continuation and Compact Imbodding and Nonlinear Elliptic Equations

He Chuanjiang

1996, 19(1):136-138.

[Abstract](476) [HTML](0) [PDF 95.56 K](113)

Abstract:
设Ω是Ｒ＾Ｎ中的有界区域，求不等式∫Ω（│△↓ｕ│＾２ｄｘ≥δ∫Ω│△↓ｕ│＾２ｄｘ成立的一般条件，其中δ〉０是常数，ｕ∈Ｈ０＾１（Ω）。

23 Study on Enconomizer Energy Fitter Mesh Used with Pump''''s Foot-Valve and Its Theoretical Analysis

Wang Shizhong , Liang Wei

1996, 19(1):139-142.

[Abstract](413) [HTML](0) [PDF 196.23 K](90)

Abstract:
A new type of fitter mesh which is used with pump' s foot-valve has been developed. We analyse its theoretical mechanism can economize energy. The result of test shows that this type of fitter mesh can economize energy efficiently.

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