Volume 26,Issue 2,2003 Table of Contents

1 A Integrate-Reset-Controlled Single Phase Power Factor Correction with High Efficiency

ZHOU Luo? wei , LUO Quan? ming , DU Xiong

2003, 26(2):1-4. DOI: 10.11835/j.issn.1000-582X.2003.02.001

[Abstract](662) [HTML](0) [PDF 328.69 K](246)

Abstract:
A novel single phase boost type power factor correction circuit is introduced .The converter's efficiency is greatly improved by improving on the traditional boost type power factor correction circuit. Integrate Reset Control circuit is adopted to realize unity power factor. The Integrate Reset Control high efficiency single phase boost type power factor corrector has these characteristics as follows: It's constant frequency operation, which is of advantage of the design of filter. The control circuit is very simple and no need for multiplier. The result is quiet perfect, the input current follows the input voltage very well. The efficiency is very high. The result of simulation and experiment proves the correction of theory analysis.

2 Application of Global Position System in Measuring Signal Frequency and the Stability of Signal Frequency

LIU Xiao? ming , WU Sheng? yong , ZHANG Hua , LI Xin

2003, 26(2):5-8. DOI: 10.11835/j.issn.1000-582X.2003.02.002

[Abstract](468) [HTML](0) [PDF 336.86 K](180)

Abstract:
Crystals with high stability are generally adopted as benchmark in the measurement of signal's actual frequency and stability, but the requirement of high precision can not be met. Some researchers found out improved methods, but it resulted in high costs. We introduce a new method, in which we use the second pulse creating from Global Position System as benchmark and design corresponding circuits in High Density Programmable Logic Devices(HDPLD), after that, we observe the resulting signals on oscilloscope. The pulse from Global Position System is easy to get and the whole system is very cheap. As the Global Position System is based on atomic clock which is accurate and stable, the measuring precision is improved greatly.

3 Analysis of Flow Stress of AZ31B Wrought Magnesium at Elevated Temperatures

FAN Yong? ge , WANG Ling? yun , HUANG Guang? sheng , HUANG Guang? jie

2003, 26(2):9-11. DOI: 10.11835/j.issn.1000-582X.2003.02.003

[Abstract](912) [HTML](0) [PDF 255.86 K](270)

Abstract:
AZ31B镁合金是应用最广泛的变形镁合金，研究它在高温下的流变应力对热加工过程有很大的实际意义。采用实验法研究了AZ31B镁合金高温高应变速率压缩时流变应力，结果表明镁合金在573－723K、应变速率为0.01-5s^-1进行高温压缩的情况下，变形温度和应变速率对流变应力有显著的影响，流变应力随应变速率的升高和变形温度的降低而升高，其稳态流变应力同Zener-Hollomon参数的对数之间呈线性关系。引入Zener-Hollomon参数的指数形式正确描述AZ31B镁合金热压缩变形时流变应力同变形温度和应变速率之间的关系。

4 Development and Application of Steep Pulse Apparatus for Tumor Treatment

MI Yan , SUN Cai? xin , YAO Chen? guo , XIONG Lan , HU Ya , HU Li? na

2003, 26(2):12-14. DOI: 10.11835/j.issn.1000-582X.2003.02.004

[Abstract](1201) [HTML](0) [PDF 342.09 K](362)

Abstract:
Under a certain electric field strength of steep pulse, plenty of micropores occur in the cell membrane. The number and diameter of micropore increase rapidly with the increase of electric field strength, the membrane breaks and the cell dies at last. This phenomenon is called as irreversible electrical breakdown (IREB). To research IREB of tumor cell, integrated with power electronics and conventional high voltage pulse generator, an energy-controllable steep pulse apparatus for tumor treatment is developed. The peak value, width, frequency and rise time of the output pulse can be adjusted independently, so the energy of the output pulse can be easily controlled. The apparatus is applied in cell experiment after a detailed analysis of its operating principle and debugging in laboratory. The experiment results show that the device works steadily and satisfies the demand of medical experiment.

5 Effect of Low Energy Ultrasonic on the Microorganism Fermentation

DAI Chuan? yun , WANG Bo? chu

2003, 26(2):15. DOI: 10.11835/j.issn.1000-582X.2003.02.005

[Abstract](1358) [HTML](0) [PDF 388.66 K](375)

Abstract:
Effect of ultrasonic on fermentation of microorganism makes cell membrane damage and has an increase of cell membrane permeability, and the membrane allows matter within to leave and that outside to enter the cell. When the power of ultrasonic is appropriately low, the cell can be retreated by themselves. Owning to this effect on fermentation, it can promote the cell growth, at the same time, can accelerate the secondary metabolite biosynthesize. As a result, the fermentation time is shortened and the production cost is reduced. This paper summarizes application of low ultrasonic in fermentation of microorganism and discusses its potential mechanism.

6 Development of High-speed Rectangle Burner Used in Baked Aluminum Reduction Cells

WU Cheng? bo , ZHANG Li , ZHANG Bing? huai , CHANG Bao? long

2003, 26(2):18-21. DOI: 10.11835/j.issn.1000-582X.2003.02.006

[Abstract](637) [HTML](0) [PDF 337.82 K](228)

Abstract:
Bake out of Aluminum reduction cells will affect the normal production and the ultimate life of reduction cell directly. The method of thermal bake out is a key of novel technology which possesses such advantages as well distributed temperature, easy control for the speed of heating up, fully baking for the joint and ramming paste of the edge. The design of the burner is a key technology of thermal bake out. A new high speed rectangle burner has been developed based on the experiment, and the structure of this burner has also been optimized. The new burner an fire easily, burn stably and fully, and has high ratio of load adjustment, and low noise, etc.. It can meet the needs of thermal bake out reduction cells. Its development can provide the technological guarantee for the use of thermal bake out Aluminum reduction cells.

7 Analysis to On-off Voltage Wave and Its Parameter of Switched Power

ZHONG Yuan? chang

2003, 26(2):22-24. DOI: 10.11835/j.issn.1000-582X.2003.02.007

[Abstract](937) [HTML](0) [PDF 215.56 K](289)

Abstract:
To analyse the working parameter of switched power, this article introduces the circuit model of switched power and the shaping process of its on off voltage wave. Aiming at analyzing to the voltage wave and parameter, an "assistant compensation" method is put forward. Based on this method, the voltage wave and parameter of switched power are theoretically analyzed and imitated. The imitation results indicate that the method is afeasible and advance one.

8 Application of SDL in the Digital System Design

CHEN Xian? liang , ZHENG Jian? hong

2003, 26(2):25-28. DOI: 10.11835/j.issn.1000-582X.2003.02.008

[Abstract](585) [HTML](0) [PDF 366.07 K](191)

Abstract:
As a standardized formal language, the SDL has widely been used in the software development. In order to extend its application field, it has been explored to use in hardware design.This paper gives a logical gate circuit-and gate as an example to explain the method of applying SDL to describe and simulate/validate the hardware characters by the SDT tool. The various logic circuits or digital circuits may be made to the SDL packages because the SDL supports the object oriented technology. These packages can be directly invoked in the design of the complex digital system, so it is possible to describe and simulate/validate the complex digital system.The experiment has proved that the application of SDL for hardware design is feasible and rather convenient.

9 Corner Point Detection Based on Adaptive Line Approximation

QIAO Yu , HUANG Xi? yue , CHAI Yi , ZHOU Xin

2003, 26(2):29-31. DOI: 10.11835/j.issn.1000-582X.2003.02.009

[Abstract](984) [HTML](0) [PDF 256.57 K](1195)

Abstract:
The detection of corner points is one of the basic problems of computer vision. Usually the key question of detecting corner points is how to calculate curvature. This paper presents a novel approach of calculating the backward and forward direction of reference point based on the adaptive line approximation. Our line approximation method objects minimize the distance error and the length of approximation widow adaptively changes with the approximation error. Our adaptive method finds a compromise between the length of approximation widow and the calculation precise. The experiments results show, the method can robustly, effectively and precisely locate corner point for curves with apparent corners with little computation.

10 Study and Implementation of Digital Flame Image Inspect System for Power Plant Boiler

CHEN Zhi? gang , MENG Jian? bo , LI Liang? xi

2003, 26(2):32-35. DOI: 10.11835/j.issn.1000-582X.2003.02.010

[Abstract](622) [HTML](0) [PDF 355.57 K](928)

Abstract:
Aiming at the shortcoming of modern power plant flame image inspect system that is based on on_off logicals,the article design a new power plant flame image inspect system based on general video capture hardware. A best optimize image segmentation arithmetic is given for image pretreatment. Based on human cognize character, the paper puts forword a Weightiness Amend Coefficient(WAC). for the purpose of enhancing the intelligent and auto_adoptions to complex combustion condition, a new Cluster Center Initiative Optimize and Auto_adoptions Rework arithmetic is put forword. At last, the experimentation result is given.

11 Estimation Methods for DOA Based on Smart Antenna

ZHANG Yi , WANG Ji? feng , LUO Yuan

2003, 26(2):36-38. DOI: 10.11835/j.issn.1000-582X.2003.02.011

[Abstract](951) [HTML](0) [PDF 253.91 K](1111)

Abstract:
Smart antenna is one of the key technique in the third generation mobile telecommunication system. Main estimation methods for DOA(direction of arrival),i.e. ESPRIT, MUSIC, WSF, Mininorm,etc., are researched,the performances for DOA estimation based on smart antenna are analyzed by the research of theory, simulation experiment and the contrast algorithms between and Cramer Rao Bound.The research results aren't only propitious to research and develop for smart antenna,but also for the application of smart antenna in mobile telecommunication.

12 FEM Analysis of Stress Distribution Law in the Rocksalt Cavity''''s Surrounding Rock

LIU Xin? rong , JIANG De? yi , XU Jiang , XIAN Xue? fu

2003, 26(2):39. DOI: 10.11835/j.issn.1000-582X.2003.02.012

[Abstract](919) [HTML](0) [PDF 354.51 K](990)

Abstract:
Basic on the FEM numerical analysis, the contour maps stress of rocksalt cavity's surrounding rock and the major principal stress's law changed with the depth and horizontal direction are analyzed. The influencing factors to the distribution of the stress surrounding rocksalt cavity, such as cavity's span, water pressure and the depth of rocksalt layer is also studied. The results show that major principal stress becomes big with the increase of rocksalt's depth. The cavity's influence to the stress's distribution will be clearer with the nearer to the cavity. The stress's centralization will be weaker with the accretion of water pressure in rocksalt's cavity. But the stress's centralization will be stronger, and the stress's value increases.

13 Effect of Reinforced-Concrete Deterioration on Structures

CHEN Zhao? hui , HUANG He

2003, 26(2):42-46. DOI: 10.11835/j.issn.1000-582X.2003.02.013

[Abstract](774) [HTML](0) [PDF 456.60 K](1456)

Abstract:
s:It is proposed that the research of the structural durability is necessary considering the structural damages under the effect of deterioration of reinforced concrete. The most common reasons, which cause the deterioration of structures in China, are reinforcement corrosion and freeze thaw cycles of concrete. Based on the summarizing of research works of the effect of reinforced concrete deterioration on structures, it is indicated that the structural durability research should be carried out either in view of material science or that of structural science, and should be also considered the interaction of several factors with uncertain nature instead of the determined individual factor analysis. The structural durability of serviceable should be paid much more attention while researching the durability of structural capacity. The effect of reinforced concrete deterioration on structural capacity, rigidity and durability should be researched henceforth.

14 Model Test Two-Stage Underground Coal Gasification in Counter Directions with Gently Inclined Coal Seam

YANG Lan? he , LIANG Jie

2003, 26(2):47. DOI: 10.11835/j.issn.1000-582X.2003.02.014

[Abstract](659) [HTML](0) [PDF 420.77 K](922)

Abstract:
为了提高煤炭地下气化产品煤气的热值，提出并研究了缓倾斜煤层反向2阶段煤炭地下气化方法。在物料平衡的基础上，建立了2阶段煤炭地下气化方法理想气化参数的计算模型。通过对模型试验结果的分析，指出了该气化方法温度场发展过程的一般规律和中热值地下水煤气的形成原因，从而得到了一些工艺控制参数。反向2阶段煤炭地下气化方法能够获得热值Q＝12.56MJ/m^3以上的地下水煤气，该煤气由水煤气和干馏气组成，与同向2阶段气化方法相比，进一步提高了气化过程的热效率。

15 Control System of Construction Quality of Building Engineering

YAO Gang , GUO Ping , LIN Lan

2003, 26(2):51-55. DOI: 10.11835/j.issn.1000-582X.2003.02.015

[Abstract](957) [HTML](0) [PDF 438.89 K](1560)

Abstract:
Through construction market survey, the paper proposes the way of the control system of construction quality of building engineering and establishes objective system of its on becoming core of quality control spot. It puts forward many grade control and evaluation net and expounds the method to produce quality evaluation form, control system of quality ordinary question and quality analysis. It determines technology way and movement foundation on system development. The paper introduces the model and its function on the control system of construction quality of building engineering. This system is a opening system, it may be filled and complemented with new content at any time. It has better adaptable to change of construction code.

16 Towns of Chongqing Sustainable Development Objective Appraisement

YE Xiao? su , WU Shu? xia , JANG Xiao? li

2003, 26(2):56. DOI: 10.11835/j.issn.1000-582X.2003.02.016

[Abstract](662) [HTML](0) [PDF 406.70 K](983)

Abstract:
Master towns of Chongqing includes Wanzhou, Fuling, Jiangjin, Huochuan and Yongchuan. According to the stratage of developing Western China and urbanization, this article discusses tendency of sustainable development in towns of Chongqing. Applying `evaluation method of arrangement model' and `analyze method of equal difference ', the authors find the short wming of the quality of urbanization and the sustainable development in five towns. So the article takes center city and towns construction and set up cooperation mechanism between the five cities that will be sure to increase momentum and ability of Chongqing for Sustainable development object.

17 And/or Dag Method in Dynamic Design and Maintenance of Data Warehouse

YING Xin? yang , GUO Ping , JING Yu , WU Yuan? hong , LIN Yong

2003, 26(2):60-62. DOI: 10.11835/j.issn.1000-582X.2003.02.017

[Abstract](463) [HTML](0) [PDF 234.75 K](1744)

Abstract:
A data warehouse (DW) is taken as a set of materialized views defined over base relations. It is dynamic entity that evolves continually over time .As time passes, new queries can be made into new views to be added to the DW. Data Warehouse is expressed as and/or dag can describe the relations between queries in DW preferably. Thus, the design of DW can simulate the problem of state space search, relevant exchange rule may define state exchange rule. It can achieve the dynamic design of DW by exchanging and predigesting of state space search. A dynamic design way is proposed to add the new views to the DW by an example.

18 Calculation on Two Types of A-A Phase in NMR System

SUN Shi? jun , PENG Cheng? lin , ZHANG Ai? ping , LUO Guang

2003, 26(2):63-67. DOI: 10.11835/j.issn.1000-582X.2003.02.018

[Abstract](644) [HTML](0) [PDF 313.46 K](855)

Abstract:
从求解核磁共振系统Schroedinger方程的一般解出发，得到核磁共振系统产生A－A相的cyclic条件和循环初态条件。cyclic条件要求系统的频率只能取离散的序列而初态可以是任意的；循环初态条件要求对系统的初态作一定的限定而系统的频率可以是任意的。在此基础上计算出系统在满足cyclic条件和循环初态条件时产生的A－A相，在cyclic条件下，系统产生的A－A相是依赖于初态和大于1的自然数的离散序列；在循环初态的条件下，系统产生的A－A相仅依赖于频率。证明了在绝热极限下，从这两类A－A相可以严格获得Berry几何相。

19 Shift Detection and Shift Control of Automated Mechanical Transmissions

HUANG Jian? ming , CAO Chang? xiu

2003, 26(2):68-71. DOI: 10.11835/j.issn.1000-582X.2003.02.019

[Abstract](918) [HTML](0) [PDF 284.68 K](191)

Abstract:
The conventional mechanical transmissions can be retro fitted to carry out the gearshift automatically.Their shifts must be detected by the sensors and controlled by the actuators.The method in detecting the shift with non contacted photoelectricity elements is proposed.For 5 speed gearboxes,two photoelectricity elements are used to detect three gear selecting positions,the other are used to two detect three gear shifting positions.The appropriate arrangement of switch inputs can make the nine shifts of a 5 speed gearbox be detected by four photoelectricity elements.Therefore the necessary switch numbers decrease,the necessary hardware is more simple and the control software is easy.The principle of shift detection and the program flow chart of shift control are given.

20 Performance Optimization Technique of SYBASE

XIONG Zhong? yang , LI Jia , ZHANG Yu? fang

2003, 26(2):72-74. DOI: 10.11835/j.issn.1000-582X.2003.02.020

[Abstract](709) [HTML](0) [PDF 300.82 K](185)

Abstract:
Performance optimizing of business database is a main problem encountered by system administrator, and it will impact the running of whole database system. This paper discusses foundation, principle and technique of SYBASE performance optimizing from the aspect of optimizing tool, database server, database structure design, database application and database running environment based on a truly application system. From the practice application point of view, it presents adoptive efficient optimizing technique and gives contrast before and after optimizing. Finally it explains that database performance optimizing is the precondition and basic to use the database efficiently.

21 Deformable B-spline Curves and Surfaces Model and Its Finite Element Solution

CHENG Si? yuan , ZHANG Xiang? wei

2003, 26(2):75. DOI: 10.11835/j.issn.1000-582X.2003.02.021

[Abstract](788) [HTML](0) [PDF 286.74 K](172)

Abstract:
Deformable models are of great importance for contour extraction and surface reconstruction, which cause the deformable models deform to the object contours due to simulated external force.Deformable B spline models can share the merit of the popular used B splie. From the Lagrangian mechanics, the dynamics equation of deformable B spline curve and surface is derived. Its finite element solution is studied including the finite element generation and element matrix calculation. A example is given to verify its validity.

22 Product Development Method Based on Product Development Domain

GUI Bai? wen , LIU Wei , LI Ming , XU Xiao? gang

2003, 26(2):78-81. DOI: 10.11835/j.issn.1000-582X.2003.02.022

[Abstract](564) [HTML](0) [PDF 333.61 K](244)

Abstract:
Product development is an integrated and interactive process. This paper proposes that there are three domains in the process of product development, i.e. product domain, organization domain and process domain, viewed at three angles of product, organization and process of product development. It is proposed that product domain is the core of these three domains, and then gets interrelations within them. The method of classifying parts and components in product domain is put forward, and the corresponding organization domain and process domain are put forward. The direction of parts and components domain is pointed out. In the end, this paper gives an example applied to the method in a motorcycle enterprise.

23 Tool Path in Terms of NURBS Curves for Five-axis Sculptured Surface Machining Using Flat-end Tools

YANG Chang? qi , QIN Da? tong

2003, 26(2):82. DOI: 10.11835/j.issn.1000-582X.2003.02.023

[Abstract](968) [HTML](0) [PDF 426.09 K](329)

Abstract:
The method is adopted and developed to keep constant scallop-height in five-axis machining of NURBS surface using flat-end tools to get the CNC tool path. Then, based on the arithmetic of NURBS interpolation, the standard of NURBS during CAM is achieved. As a result, the CC points' quantity is greatly decreased and the problem that the CC path discontinuities of is overcome. Illustrative examples show the substantial improvements achieved over line-interpolation method for decreasing the amount of data on the condition of the same precision.

24 Optimization of Vehicle Frontal Wheel Orientation Parameters

CHU Zhi? gang , DENG Zhao? xiang , HU Yu? mei , XIONG Wei

2003, 26(2):86-89. DOI: 10.11835/j.issn.1000-582X.2003.02.024

[Abstract](1059) [HTML](0) [PDF 364.47 K](343)

Abstract:
Based on the theory of multi body dynamic, the paper established the front suspension model of vehicle. The uniform optimization object function, including the tolerance of front wheel orientation angles' practical value and set value under full load, and the changing value of each parameter during wheel fluctuating is put forward. Utilizing this model, the original suspension is optimized and the variation of each parameter with front wheel fluctuation is calculated. The optimized driving operation performance resulted from the analysis and application.

25 Analysis of Vibration Experiment for Pedal-motor

LI Yi? nong , MI Lin , YANG Chen

2003, 26(2):90-93. DOI: 10.11835/j.issn.1000-582X.2003.02.025

[Abstract](1162) [HTML](0) [PDF 362.10 K](529)

Abstract:
Based on the analysis of experimental model, the vibrating experiment was made for the frame and engine of motorcycle in order to find the resonance frequency of the frame. Then the effect of engine exciting on the body vibration was analyzed, so that the mode frequency avoids the range of engine rotation speed. The experiment results show that the vibration of the saddle in vertical direction and the handlebar are caused by the resonance, while the vibrations of the other two directions of saddle and the pedal are the result of the transmission of engine energy. In order to decrease the transmission of the engine energy to pedals, we can change the stiff welding between the pedals and the frame of the motorcycle into the elastic link. Furthermore, to avoid the resonance of the frame in vertical direction, besides increase the stiffness of the frame, we can reduce the stiffness of the frame under the condition of having sufficient intensity, so that the nature frequency of the frame is reduced below the operating speed of the motorcycle engine.

26 Design of Manufacturing System for Business

LI Ming , LI Jun , ZHANG Bi? de , LI Ji? jun , LIU Wei , GUI Bai? wen , ZENG Li

2003, 26(2):94-96103. DOI: 10.11835/j.issn.1000-582X.2003.02.026

[Abstract](747) [HTML](0) [PDF 359.07 K](188)

Abstract:
In the new environment, product development is the core of product innovation and quickly responsive to the market for the enterprises. The speed and effectiveness of development is the key factor to the success of product development. The design for business is the key technique in achieving the effectiveness of product development. And manufacturing system is the bridge between business and products. The design method of facing business is discussed, and the design flow and content of manufacturing system supporting facing business are pointed out. At the same time, the author also sets forth the construction definition, the construction design and the detailed design of the manufacturing system. So the design flow of manufacturing system facing business is established.

27 Innovating Method of Mechanism Configuration Project Based on Kinematic Chain

XIANG Cheng? xuan , HUANG Mao? lin , XU Huai? you

2003, 26(2):97-103. DOI: 10.11835/j.issn.1000-582X.2003.02.027

[Abstract](743) [HTML](0) [PDF 432.37 K](314)

Abstract:
The structure design is the most crucial and innovative one in the process of mechanism system design, and attention is constantly given to them. Although the various methods of structural synthesis are presented, more study due to faultiness of them are essential. All of available configurations of the single joint kinematic chain are gotten by replacing its pairs. On the basis of symbolization of pairs, the authors put forward the mathematic approach of permutation and combination by which all of configurations of the kinematic chain can be obtained, structure graph is used to judge the type of same fabric of the kinematic chain. Finally their application examples in engineering are given.

28 Main Frame of Contemporary Integrated Manufacture System

JIA Yi , HE Yu? lin , LIU Xue? mei

2003, 26(2):104-106. DOI: 10.11835/j.issn.1000-582X.2003.02.028

[Abstract](1059) [HTML](0) [PDF 278.67 K](466)

Abstract:
Based on the success of CIM philosophy applied in manufacturing industries for reference, the author, analyses the character of modern furniture's produce and management, etc., and set out from real need of modern furniture manufacture to establish the architecture of contemporary integrated furniture manufacture system. The key technologies such as methods and viewpoints of contemporary integrated furniture manufacture system are discussed. Finally, the stream of material is reviewed as core and ERP, FEC is included in contemporary integrated furniture manufacture system based on web distributed database is put forward. The work is a helpful investigation to CIMS and gives a beneficial idea to implement CIMS in furniture industry.

29 Fracture Occurrence Mechanism and Control Measure Research of Generator and Compressor Bracket

XIONG Wei , DENG Zhao? xiang , CHU Zhi? gang , LIU Jian

2003, 26(2):107-109131. DOI: 10.11835/j.issn.1000-582X.2003.02.029

[Abstract](959) [HTML](0) [PDF 360.09 K](1119)

Abstract:
During a minibus's practical road driving and engine test rig test for vehicle and engine reliability, the phenomenon of generator compressor bracket fracture appears and leads the generator compressor crankshaft belt rupture. It seriously affects the vehicle's operation performance. The article carries through engine test rig test and analysis, using frequency and spectrum technology to identify the bad vibration source combining FEA. It also researches vibration's occurrence, formation, propaganda and fracture mechanism. Based on this, the authors put forward countermeasure, which improves the dynamic characteristic of the system, decreases the vibration intensity and avoides the fracture of bracket and belt.

30 ECG Information Management System of Virtual ECG Instrument

CAO Yi , ZHU Hong? jun , QIN Shu? ren

2003, 26(2):110-112. DOI: 10.11835/j.issn.1000-582X.2003.02.030

[Abstract](658) [HTML](0) [PDF 344.35 K](1001)

Abstract:
ECG is an important method in clinical heart disease diagnosis. The storing of lots of ECG and other corresponding materials in information management system has great value to medical researcher for their reference and research. Embedding the ECG information management system to virtual ECG instrument is not only enhanced the operating value but also increased the functions to virtual ECG instrument. The model of relation database and ActiveX Data Object (ADO) of VC++6.0 is used in the system. The key functions of Storing,Query,Deleting and core modules are introduced.

31 A Phase-Shifting Controlling Technique for Series Connection of IGBTs

FU Zhi? hong , SU Xiang? feng , ZHOU Luo? wei

2003, 26(2):113-116. DOI: 10.11835/j.issn.1000-582X.2003.02.031

[Abstract](822) [HTML](0) [PDF 330.91 K](1175)

Abstract:
IGBT器件在电力装置中得到广泛应用，用IGBT串联提高装置对超单管耐压电源的控制是切实可行的，关键问题要解决IGBT串联的静态均压和动态过压问题。提出用并联电阻的办法解决静态均压问题；用移相控制技术，通过对主电源分级，对各级电源移相控制，实现主电源的分级接入和撤离，解决主控电路中IGBT的动态过压问题。文中讨论了IGBT串联电路的耐压、移相角度等参数的确定办法，分析了该技术对开关极限频率、输出波形的影响以及存在的问题。该技术已在大功率激电发送机产品中得到成功应用。

32 A Review on Class D Audio Power Amplifier Control Techniques

GONG Wei , ZHUO Luo? wei

2003, 26(2):117-122. DOI: 10.11835/j.issn.1000-582X.2003.02.032

[Abstract](961) [HTML](0) [PDF 538.11 K](1729)

Abstract:
Although class D amplifier has high efficiency, its distortion is larger than linear counterparts due to switching behaviour of power transistors. It is the hotspot of power electronics and audio power amplifier that researching new control technique to improve fidelity of class D amplifier. In this paper, a few novel control techniques in class D audio power amplifier are reviewed.

33 Application of ObjectARX Technology in Power CAD

QIU Xin? fu , CHEN Gang

2003, 26(2):123-126. DOI: 10.11835/j.issn.1000-582X.2003.02.033

[Abstract](634) [HTML](0) [PDF 307.31 K](1097)

Abstract:
Considering Object oriented design, abstract mechanism of object and technology of procedure design in ObjectARX are introduced.By analyzing characteristics of power network, the puper it elaborates process of definition special object by using of open structure of AutoCAD inner database , base class provided by ARX and mechanism of calss inheritance and derivative. The class definition of elemens is also given in power system as well. Technology of data exchange is also elaborated. On this base ,object models of power CAD are constructed.Date exchange between PWCAD and the external database is also realized.

34 Influence of Hydrogen on Impact strength and Microstrcture of the Titanium Alloy Ti-Al-V

LI Yuan? rui , HUANG Ben? duo , HE Qing? bing

2003, 26(2):127-131. DOI: 10.11835/j.issn.1000-582X.2003.02.034

[Abstract](760) [HTML](0) [PDF 529.43 K](1377)

Abstract:
Absract:After analyzed and tested the composition, microstructure and the mechanical property for the forging timber of the titanium alloy Ti-Al-V, Processed it into lash test samples , and made the samples having different hydrgen-content by the way of artificial hydrogen-absorption. Next, measured the impact strength vaules(ak ) of the titanium alloy in different hydrogen-content, and drawn the relation curve between the impact strength and the hydrogen-content. Afertwards,four samples and themselves impact fractographies whose hydrogen-contents are 48ppm,137ppm, 361ppm and 666ppm have been used for phases and the sweep electorn microscopes,Known microstructures and shapes of the hydrogenate of the different hydrogen-content tianium alloy and that the hydrogenate is sheet and its distribution in the titanium alloy.

35 Finite Element Analysis of Concrete Structures Strengthened with Carbon Fiber Sheet

WANG Xiao? rong , JIAN Kai? lin , LIU Min , CHEN Guo? fu

2003, 26(2):132-135. DOI: 10.11835/j.issn.1000-582X.2003.02.035

[Abstract](751) [HTML](0) [PDF 390.99 K](1378)

Abstract:
Stress redistributes after the concrete structures strenthened with carbon fiber reinforced polymer sheet. It is a question of secondary loading.Many scholars have studied it and got a lot of achievements.This paper summarizes the methods and analyzes their advantage and shortcoming. Based on it, a new method is proposed.The method is developing in large-scale general software-Ansys by using adding new elements, constitutive relationship, failure criterion,and so on.The calculation formula agrees with the experimental data.

36 An Empirical Study on the Relationship between Economic Growth and Financial Development

RAN Mao? sheng , ZHANG Zong? yi , ZHONG Zi? min

2003, 26(2):136-140. DOI: 10.11835/j.issn.1000-582X.2003.02.036

[Abstract](668) [HTML](0) [PDF 433.41 K](1091)

Abstract:
This paper discusses the relationship between financial development and economic growth. Some essential Chinese macroeconomic datum during late twenty years which include Gross Domestic Product (GDP) of the whole economy,state and private sectors,investment in fixed Assets,financial relative rate and real interest rate estimated in a multivariate vector auto regression (VAR) framework. The estimates suggest that financial development boosts GDP growth, and it does not exist in reverse.

37 Game Analysis between Manufacturer and Wholesaler in the Management of Distribution Channel

LIAO Cheng? lin , LIU Zhong? wei

2003, 26(2):141-144. DOI: 10.11835/j.issn.1000-582X.2003.02.037

[Abstract](778) [HTML](0) [PDF 348.45 K](1205)

Abstract:
In the distribution channel management, a good cooperation relationship between manufacture and wholesaler is an effective way for them to complement each other with their respective advantages, improve channel competitive abilities and adapt to market fluctuations. Based on their mutual cooperative relationship, a mixed game model is constituted by introducing the characteristics and postulating the prerequisites of trade between manufacturer and wholesaler, then the factors affecting their mutual cooperative relationship and the conditions of their stable cooperation are found through analyzing the mixed game model. Furthermore, a finitely repeated game model is used to analyze the cooperation between manufacturer and wholesaler, the conclusion of the cooperative qualification that influences the cooperation of both sides is given. As a result, the strategies employed by the manufacturer and wholesaler are pointed out.

38 Theory of RBV-Competitive Advantage of the Stock Company

SUN Zhi? yong , ZHANG Wei? guo , LU Yu? mei

2003, 26(2):145-147. DOI: 10.11835/j.issn.1000-582X.2003.02.038

[Abstract](844) [HTML](0) [PDF 303.82 K](975)

Abstract:
China's stock market enters a stage where the competition's rules as well as the competition's environment are changing continuously,Under such circumstances,to gain the competition advantages is of vital importarce to the existence and development of China's stock companies themselves. As a result, the stock companies should have a thorough analysis of the RBV theory at present, and evaluate its applicability to China's stock companies, Then they should come up with some reformational measures,aiming at improving the competition advantages of domestic stock companies. There fore they are able to make measonable use of the company's resources and accomplish the organic unity combination of the company's valued resources and its strategic administration. These are the key measures used by stock companies to gain the competition cedvantges.

39 Controlling Model of Company''''s Financial Index

ZHOU Zhuo? hua , YU Xin , LIAO Bing , CHEN Wen? nan

2003, 26(2):148-150155. DOI: 10.11835/j.issn.1000-582X.2003.02.039

[Abstract](701) [HTML](0) [PDF 353.87 K](202)

Abstract:
In a mature, standard and perfect securities market, with the interaction relationship each financial data, we build a model of a union equation. In terms of the data of years data, we can estimate the parameters of the theory of financial control, the managers and investors can control reasonably the process to the object of financial measures system, through some relevant financial measures data. In the opposite, they also can calculate the financial measures data of the firm by the optimum controllable variable.

40 Application Of Virtual Instrumentation in Radio Measuring System

ZHONG Bing? xiang , CHI Bin

2003, 26(2):156-158. DOI: 10.11835/j.issn.1000-582X.2003.02.041

[Abstract](678) [HTML](0) [PDF 319.62 K](193)

Abstract:
Radio administration department permits station's building and distributes frequency used by measurement in radio electromagnetic environment. In order to improve the efficiency and accuracy of testing, the automatic measuring system software based on virtual instrumentation technology(VISA and SCPI) has developed at the VB platform, which changes the phase of outputting data just by printing spectrum chart .The system realizes functions of data sampling, transffering and processing in HP E7405A EMC analyzer. It also can establish database files for saving, inquirring, data shareing, exchanging and processing. The spectrum chart of mearsurment result is the same as that of result by manual work.

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