Volume 27,Issue 4,2004 Table of Contents

1 Analysis of UHF Method Used in Partial Discharge Detection in GIS

TANG Ju~ , WEI Gang~ , SHI Hai-jun~ , SUN Cai-xin~ , ZHU Wei~ gy under the State Ministry of Education , Chongqing University , Chongqing , China , .Changshu Power Supply bureau , Jiangsu Eelectric Power Company , Changshu , China)

2004, 27(4):1-5.

[Abstract](772) [HTML](0) [PDF 457.39 K](216)

Abstract:
The possibility of UHF (ultra high frequency) method used in partial discharge detection in GIS is analyzed, and the UHF sensor, simulating passive filter, detecting the method of wide-band and narrow-band are studied, in order to avoid interferes of low-frequency. The authors develop an inner loop sensor in GIS model and investigate UHF method detecting partial discharge in GIS. The results indicate that the UHF system of detecting PD can effectively detect partial discharge and avoid outer corona interfere and Periodic pulse interfere. At the same time, narrow-frequency PD detection is an effective detection method to restrain UHF interferes.

2 Application of Dot-matrix LCD in Speech Terminal

QIN Sheng~ , LIU Xiao-ming~

2004, 27(4):6.

[Abstract](571) [HTML](0) [PDF 380.57 K](106)

Abstract:
Dot-matrix LCD makes a feature of low power dissipation,small volume,and displaying more information,also widely used in automatic instrument.To provide more better user interface, dot-matrix LCD is used as a displayer.The interface circuit for dot-matrix LCD with MCS-51 singlechip microcomputer and the design of software corresponding are described in detail.Meanings of sixteen signal wires of a port is explained.the initial program of LCD is given,and the principle of Chinese charater and menu display is introduced. The hardware design of speech terminal is simple with a LCD module,while the user interface is more beautiful with the technology of chinese character and menu display. The adjustment of LCD contrast is discussed,and the solution is given.

3 Power Frequency Electric Field Caused by EHV Lines and Its Effect

FENG Yan-yan~ , YU Ji-hui~

2004, 27(4):10-14.

[Abstract](710) [HTML](0) [PDF 398.00 K](191)

Abstract:
Mathematical model of power frequency electric field is established based on Charge Simulation Method(CSM) to analyze power frequency electric field caused by EHV lines with overhead ground wires and its effect, which are entering the megalopolis. Calculative method on the electric field under the transmission lines is analyzed and validated. According to the criterion of environmental evaluation, the distributing characteristic of electric field is summarized, in case of various arrangement manners of lines. At last, some advice and methods of eliminating electric field under the transmission lines entering the megalopolis is proposed with regard to protecting environment.

4 FDTD Method''''s Application in the Research of Television Interference From High Voltage Transmission Line

LIU Qing-song~

2004, 27(4):15-19.

[Abstract](704) [HTML](0) [PDF 453.21 K](143)

Abstract:
The mechanism of television interference is discussed from High voltage transmission line. Then the computational model is established, and scattering fields are calculated with the finite-difference time-domain(FDTD) method, and the results are visualized. The scattering effects of High voltage transmission lines on horizontal polarization waves (corresponding to TM mode) are greater than on vertical polarization waves (corresponding to TE mode).

5 Vibration & Noise Analysis on Double-ring Gear Reducer

XIE Yong-chun , WANG Li-hua , LIU Wen , LIU Jing-hao , Chongqing , China)

2004, 27(4):20-23.

[Abstract](553) [HTML](0) [PDF 324.51 K](144)

Abstract:
Double-ring gear reducer with Central inputting shaft is studied. The basic structure of reducer as well as testing equipment, probe spot and testing method of Structure-borne noise and air-borne noise is presented. Based on frequency spectrum of each point, amplitude spectrum of structure-borne noise and testing results of air-borne noise, the authors analyze the vibration characters and latent faults of double-ring gear reducer, coming to the value and the cause of the noise, providing theoretical basis for proper design of the double-ring gear reducer and method of reducing its vibration and noise.

6 Optimization of Worm Gearing''''s Geometric Parameters Under the Condition of the Errors and the Load

XU Wu-jiao , QIN Da-tong , SHI Wan-kai ongqing , China)

2004, 27(4):24.

[Abstract](547) [HTML](0) [PDF 370.07 K](267)

Abstract:
平面二次包络环面蜗杆因具有承载能力大,润滑性能好,传动效率高等优点而得到广泛应用,但这种蜗杆传动对误差和受载变形的影响敏感.在实际工况条件下,作者基于传动副的实体模型,采用3-D接触有限元方法综合分析了平面二次包络环面蜗杆的母平面倾斜角β、蜗杆分度圆直径系数k1、主基圆直径系数kb和I传动比对传动副啮合性能和承载能力的影响,认为选取较大的母平面倾斜角β和较大的蜗杆分度圆直径系数k1对传动副的传动质量有利.这为在工程实际中结合具体工况优选设计参数提供了参考依据.

7 Researching and Developing a Hybrid Electrical Vehicle

REN Yong , QIN Da-tong , YANG Ya-lian , YANG Yang

2004, 27(4):27-30.

[Abstract](771) [HTML](0) [PDF 377.26 K](1460)

Abstract:
There are more than two power source in Hybrid Electrical Vehicle(HEV). By using of assist accelerating, power regeneration, Idle stop and power management, HEV gains more acceleration performance and more fuel economy and better gas emission than Conventional Vehicle(CV). With Integrated Starter and Generator(ISG) as a auxiliary power source, batteries and battery control module and power manage module as a Load leveling Device (LLD), two prototype HEV separately equipped Manual Transmission (MT) and Continuously Variable Transmission (CVT) was successfully developed.

8 Effect of Environmental Factors on Mini-automobile''''s Sale in Urbanization Process

ZHU Tian-tian~ , YANG Zheng-shu~ , LIU Wei~ , YI Hui-yong~

2004, 27(4):31-33.

[Abstract](532) [HTML](0) [PDF 252.74 K](1111)

Abstract:
As the synthetic reflection of many characteristics' development in modernization process, urbanization indicates that the social structure, social relationship and economic relationship has changed deeply. The development of automobile industry has close relation to these changes of macroscopic environment. Based on the changes of environmental factors in urbanization process, this paper researches into how urbanization process affects the sales of automobile. It founds an indicator system of environment, which reflects the level of urbanization, makes correlate analysis between the environmental independent variables and the sales of different kinds of automobile to quantify the degree of effects. All in all, this paper provides an available basis to the research in basal characters and developmental trend of mini-automobile's consumption.

9 Semantic Representation Approaches and Corpus Construction Based on Term Connections

LI Liang-yan , HE Zhong-shi , YI Yong

2004, 27(4):34-38.

[Abstract](556) [HTML](0) [PDF 468.41 K](882)

Abstract:
The current Natural Language Processing (NLP) means is chiefly grounded on the principle of language rules' description pattern, which lacks comprehensive semantic representation capability, and therefore it can not efficiently process the real texts in the layer of semantic meaning. This paper presents a semantic representation approach based on term connection samples. This method promotes the idea of describing fundamental language samples, and can analyze comprehensive semantic representations. So far it has been applied in project CAPC (Computer Aided Poetry Composing) funded by the Chinese Natural Science Foundation.

10 Application of Chaos Theory in Cryptography

ZHANG Hong~

2004, 27(4):39-43.

[Abstract](827) [HTML](0) [PDF 492.37 K](2033)

Abstract:
Cryptography has the crucial importance in modern info-society. The merits of chaos have brought a new means for the design of cryptography. As a brilliant achievement of modern cryptography, chaotic cryptography has great potential and becomes more and more popular in info-security field. The corresponding problems about cryptography and chaos theory are discussed in detail. The theory and method of the chaos-based cryptography is analyzed, the recent research development of chaos-based cryptography is expatiated. Both advantages and disadvantages of chaos-based cryptography are summarized and the future research trends are outlined.

11 Incremental Learning Algorithm of Induction

CHENG Yu-sheng~

2004, 27(4):44-48.

[Abstract](620) [HTML](0) [PDF 363.44 K](964)

Abstract:
The algorithm about incremental generating decision function is built by modifying the definition of discernibility matrixes. So it is programmed effectively in the computer. The discernibility matrixes is not generated because the great quantity of data is fetched one after another. The lack of memory is solved by handing data in large database. The algorithm is adapted to the dynamic data and is able to deal with dynamic learning. The time of Data Ming decreases because of information reuse. At the same time, the question of learning about multi-classes is solved in essence by using the incremental generating decision function.

12 File Intertransmission Based on WinSock Component

MA Yong-qin , LI Zheng-wen , WANG Liu-yan

2004, 27(4):49-52.

[Abstract](576) [HTML](0) [PDF 372.87 K](917)

Abstract:
WinSock is a group of API,which is used to transmit data and exchange information on Internet,the Socket Application programme impoldered by users may communicate with other Socket Application programes by Internet. Delphi provides Socket components,which sustains the TCP/IP protocol and makes the Internet programming acquiring much more flexibility.This paper probes that how to realize transmission of files in any format under nonblocking mode between clients and servers by means of Socket components of Delphi.

13 Intelligent Fire Monitor System Based on Internet

DUAN Qi-chang , CHEN Zhuo , HE Qiang

2004, 27(4):53-56.

[Abstract](426) [HTML](0) [PDF 380.97 K](1415)

Abstract:
On the present condition of fire control, we propose the fire intelligent monitor scheme based on Internet, which aims at urban fire in a large range. Then the overall structure and primary function modules of the system are discussed. Contrast with traditional fire-fighting mode, our system can identify and location fires automatically, shorten rescue time and increase operation efficiency through the application of intelligent fire identification and GIS.

14 Design and Realization of Circular Polarization Microstrip Antenna

HAN Qing-wen , YI Nian-xue , LI Zhong-cheng , LEI Jian-mei

2004, 27(4):57.

[Abstract](782) [HTML](0) [PDF 363.86 K](1972)

Abstract:
The circular polarization microstrip antenna is one kind of low cut plane antenna element . Researching circular polarization microstrip antenna property is very important in antenna design. And how to find the feed place is the key to design. Researching makes a detailedly analysing and expounding of the pentagon circular polarization microstrip antenna in view of the single ended side. The microstrip antenna realization means is introduced. The way to analyze polygon microstrip antennal is given, which is named finite cell. By adjusting the 5.6 GHz pentagon circular polarization microstrip antenna, we give out the circular polarization microstrip antenna design processing. The feed place is found with the right means. Adopting HFSS software to optimize the design , and carries on imitation , give out the right imitation result .

15 Design and Implementation of Chaos Encrytion Algorithm based on Logistic Formula

DENG Shao-jiang , XIAO Di , TU Feng-hua

2004, 27(4):61-63.

[Abstract](705) [HTML](0) [PDF 257.94 K](960)

Abstract:
The security of stream cipher, which is known as one of the main cipher techniques, dependents completely on the quality of generated pseudo-stochastic sequences. Chaotic systems can produce the pseudo-stochastic sequences with the properties of excessive dependence on initial conditions and the difficulty in forecasting, therefore, these systems are suitable to the stream cipher. A new encryption algorithm is proposed by analyzing the principle of the chaos encryption algorithm based on logistic formula. Moreover, the security and performance of the proposed algorithm is also estimated. Finally, an example is given to demonstrate our method via the Visual C++.

16 Application of IEEE1394 Communication Technique in Car-engine Real-time Imitating

CHEN Yu-guang , CHEN Xin-gang

2004, 27(4):64-66.

[Abstract](518) [HTML](0) [PDF 256.38 K](965)

Abstract:
A design scheme using IEEE1394 serial interface to achieve communication between PC computer and DSP controller is introduced, which is used in real-time imitating for car-engine integrated controlling system. First, the rule of high speed IEEE1394 serial communication using TSB41BA3/TSB12LV01B interface is discussed. Further, the design scheme of software and hardware of communication sub-system is probed. The application effect is good in the car-engine integrated controlling system developed.

17 Exploration of Gas Chromatographic Retention Indices (RIGC) of Phenols by Molecular Electronegativity-Distance Vector (MEDV)

HU Li-mei

2004, 27(4):67-71.

[Abstract](551) [HTML](0) [PDF 381.61 K](98)

Abstract:
The molecular electronegativity-distance vector (MEDV)descriptors were used to characterize the chemical structure of 102 phenols. The MEDV descriptors were employed to establish the quantitative relationship models with respect to retention indices of gas chromatography (RIGC) for 102 compounds examined. The correlation coefficient of the ten-variables models obtained from multiple linear regression (MLR)is R=0.943 6, and that of the nine-variables model obtained from stepwise multiple regression (SMR)is R=0.943 6, the correlation coefficient value of in cross-validation by the leave-one-out procedure (LOO)is R_(CV)=0.844 8. The satisfactory results showed the constructed models were provided with excellent estimation stability and favorable predictive ability.

18 Relativistic Traveling Wave Tube Filled With Plasma

XIE Hong-quan~

2004, 27(4):72-77.

[Abstract](522) [HTML](0) [PDF 524.38 K](91)

Abstract:
相对论行波管是近20年来发展起来的一种重要的高功率微波器件,它利用电子注中的慢空间电荷波与结构波发生同步互作用来实现高频信号放大.近年来研究发现,当在微波器件中填充了等离子体以后,器件的输出功率和互作用效率得到显著提高,同时等离子体还可改善电子注的传输质量,甚至取消笨重的外加磁场.综述了等离子体填充相对论行波管的研究背景和国内外的发展概况,报道了该类器件在理论和实验研究两个方面的最新进展,具体分析了等离子体加载两种慢波结构--波纹波导和螺旋线中电磁波传播的色散方程,预测了该类器件的发展趋势,提出了一些建议.

19 Purification Efficiencies of Trickling Biofilter With Waste Gas Subsection-Inlets

CHEN Rong , LIAO Qiang , ZHU Xun

2004, 27(4):78-81.

[Abstract](693) [HTML](0) [PDF 279.72 K](247)

Abstract:
The purification efficiency of trickling biofilter with waste gas subsection-inlet is numerically computed based on the capillary model. The studied trickling biofilters involve the one with several subsection-inlets but only one exit and another with several subsection-inlets and exits. The purification efficiency of the trickling biofilter with several subsection-inlets and one exit is lower than the traditional trickling biofilter with one inlet and exit under the same operational conditions. As the number of subsection-inlet increases, the purification efficiency decreases. For the trickling biofilter with several subsection-inlets and one exit, the number of subsection-inlet has very little influence on the purification efficiency that is very close to the purification efficiency of the trickling biofilter with one inlet and exit.

20 Module Design of Refrigerant Themodynamic Properties Calculation for Simulation of Refrigeration and Air Condition System

PENG Yan , CHEN Hong , WANG Guang-jun

2004, 27(4):82-85.

[Abstract](546) [HTML](0) [PDF 276.98 K](210)

Abstract:
This paper constructs a model of refrigerant thermodynamic properties calculation for simulation of refrigeration and air condition system based on the parametric equations of state of refrigerant. The Visual C++ 6.0 language is used to develop this model, which has a friendly user interface (UI). This program is easy to learn and use and it has reliably function. Compared with the data provided by the standard graphs and tables of refrigerant thermodynamic properties, the calculation results of this model have certain precision and meet the expectative requirements.

21 Application of Surface Analysis Methods in Researching Anticoagulant Biomaterials

HUO Dan-qun~

2004, 27(4):86-89.

[Abstract](566) [HTML](0) [PDF 403.58 K](93)

Abstract:
The main purpose of researching and designing(R&D) anticoagulant biomaterials is to find a polymer material which possesses some special properties, when it attatches to the blood or tissue of human body, it could not cause clotting, thrombus or inflammation. The properties of anticoagulant biomaterials mentioned is correlated with its surface property. So, the surface property of anticoagulant biomaterials need to be characterized. Seven general surface analysis methods and one novel nuclear method which are used to characterize anticoagulant biomaterials are summarized. The typical references for the application are listed to introduce the theory,advantage and disadvantage of each method. At last it is pointed out that only making full use of these methods can we comprehensively know the surface structure of anticoagulant biomaterials, and then use these information to guide our research.

22 Development of CuMn35 Master Alloy

JIANG Han-xiang , WANG Hong-jia , TANG Ying , GUO Hong

2004, 27(4):90-92.

[Abstract](599) [HTML](0) [PDF 219.70 K](81)

Abstract:
This article has investigated the principle and method of smelting CuMn35 master alloy by fusion alloying. And some questions about deoxidation and removal of hydrogen has been discussed. We have found the best process conditions after a series of orthogonal experiments and obtained uniform components by chilling technique. Elsewhere, we use carbon and cryolite as covering agent and refining agent to reduce oxide inclusion greatly and improve the surface texture and the yield of copper and manganese, attained 99.99% and 99.31% respectively. The results of the experiment show that the process is advisable.

23 Formation of Zinc Oxide in the Course of Directed Nitriding With Aluminum Zinc Alloy

ZHOU Zheng , TAO Jing-mei

2004, 27(4):93-96.

[Abstract](487) [HTML](0) [PDF 406.92 K](116)

Abstract:
ZnO is formed in the course of directed nitriding with Al-Zn alloy, and that the effect of zinc and magnesium on the directed nitriding process is big different. The long fibers which diameter are far less than one micrometer, short bar-like and tetrapod-like zinc oxide is obtained. The three important stages of initial growth kinetic of ZnO approving ZnO have growth mechanism of VS, they are stage of accelerating, linear and parabola, are discovered. Experimental results show that the volatilization of zinc play a very important role in the growth of ZnO,the growth of ZnO is controlled by the diffusion of zinc in the Al-Zn alloy , and the morphologies of ZnO is depend on the saturation level of the vapour.

24 ZnO:Al Films Prepared by RF Magnetron Sputtering at Room Temperature

HUANG Jia-mu , DONG Jian-hua , ZHANG Xing-yuan

2004, 27(4):97-99.

[Abstract](474) [HTML](0) [PDF 276.73 K](174)

Abstract:
ZnO:Al薄膜是一种N型宽带隙半导体材料,由于其大的载流子浓度和光学禁带宽度而表现出优良的光电特性.采用射频磁控溅射工艺,在室温下用氧化锌铝陶瓷靶(3wt%Al2O3)溅射沉积透明导电ZnO:Al薄膜,研究了各工艺参数,如氧流量、工作气压和射频功率对其光电特性的影响.实验结果表明:通氧量与靶材中含氧比例存在紧密联系,本实验在氧流量为0 sccm,射频功率400 W,Ar气为0.7 Pa,溅射时间为2.5 h的条件下,制备的ZAO薄膜最小方块电阻为65Ω/□,薄膜表面略显黄色.

25 Effect of Chemical Composition on Formation Performance of 7050 Alloy Billets

DUAN Yu-bo , TANG Jian , DIAO Wen-wu , MOU Da-qiang

2004, 27(4):100-102117.

[Abstract](675) [HTML](0) [PDF 323.87 K](91)

Abstract:
The casting technology of 7050 alloy bilits is researched. that are used to produce slabs for air materials.Because the composition of 7050 alloy is very complex,the Cu and Zn elements contents are higher and Fe and Si impurity elements contents are controlled lower, at the same time ,the specification and the width-thickness ratio are large ,all of above result the tremendous crack trend when casting and bad casting formation performance . The formation performance of 7050 alloy has been improved and qualified billits are obtained by optimizing the composition of 7050 alloy, including raising Fe/Si ratio and Zn/Mg ratio ,reducing Cu content and adopting the joint refinement with block and silk shaped Al-5Ti-1B.

26 Feasibility for Building the Under-ground Sewage Treatment Plant in Chongqing City

LIU Xin-rong , BAO Tai , ZHU Ke-shan

2004, 27(4):103-106.

[Abstract](756) [HTML](0) [PDF 384.79 K](140)

Abstract:
With the development of the economy, the demand forhabitation is enhanced and the sewage and industrial waster water must be disposed before outlet. Today, most of the sewage treatment plants are built on the aboveground without discussing the underground. Therefore, by the comparative analysis of the property and cost of the underground sewage treatment plant and the ground, the underground sewage treatment plant have merits in save the city land and improvement environment.The Chongqing citypossess a lot of advantages in using the space of underground with the analysis of the physiognomy and geology condition of the Chongqing city. Therefore, the development of underground sewage treatment plant is feasible in the Chongqing city.

27 Experimental Study on Moment Modulation of Prestressed Frames

JIAN Bin , SUN Xin-min , WANG Zheng-lin

2004, 27(4):107-110.

[Abstract](636) [HTML](0) [PDF 328.96 K](1084)

Abstract:
Based on the experimental study of two prestressed frames in redistribution of Internal force, it can be concluded that the dominating influence factors on moment modulation are the relative height of equivalent compression zone, the secondary moment, the ratio of beam rigidity to column and development of cracks in the top of columns.The secondary moment is very important in modulation of frames. Especially, the secondary moment will governing the modulation when the relative height of equivalent compression zone is large enough.

28 Acclimation in Partial Nitrification Process of Long MCRT

WEI Chen , LUO Gu-yuan

2004, 27(4):111-113.

[Abstract](524) [HTML](0) [PDF 313.17 K](1135)

Abstract:
Nitrite accumulation will drop down when the nitrite oxidation bacteria have acclimated to the nitrifying conditions after stable performance for some times. Accumulation is a gradating course, nitrite disappear will take only a few days. A long MCRT can not maintain a long term stable partial nitrifying process. The refreshment of system sludge and suitable MCRT is key for nitrite accumulation, and bacillar sludge is its typical feature.

29 Finite Element Method of 3D Stable Heat Conduction of Steel Fluid in Continuous Casting Moulds

YAN Bo~

2004, 27(4):114-117.

[Abstract](469) [HTML](0) [PDF 284.90 K](1085)

Abstract:
The heat transfer of steel fluid in continuous casting mould is a stable process and can be depicted with three-dimensional stable heat conduction equation depending on tension speed. The corresponding finite element equation, including the first, second and third boundary conditions, is deduced out with Galerkin residual method. The coded FEM program is used to analyze the temperature distribution of Q235 steel in continuous billet casting mould. The method proposed is a foundation of thermo-mechanical coupled analysis for the formation of solidified shells and stress in the shells in continuous casting.

30 Feed-forward Neural Network Based onGaussNewton-NL2SOL Algorithm and Its Application

XU Jin

2004, 27(4):118-121.

[Abstract](532) [HTML](0) [PDF 308.58 K](1180)

Abstract:
Though the feed forward neural network based on GaussNewton algorithm and its derivation will converge with order two, it is only effective toward little residual problem. In order to solve the little and large residual problems at the same time, NL2SOL algorithm is introduced and combined with the GaussNewton algorithm so as to form a feed forward neural network based on GaussNewton-NL2SOL algorithm. The application shows that this neural network can solve the residual problem properly and the convergence and stability of it performs well.

31 Two Dimensional Bar Code in medicine Trade Logistic Management System

ZHANG Hong~

2004, 27(4):122-125129.

[Abstract](548) [HTML](0) [PDF 462.70 K](1288)

Abstract:
The characteristics of two dimensional bar code are analyzed, then the technological characteristics and the composition of logistic bar code are discussed.Through the analysis of application in medicine trade logistics management system,the PDF417 two dimensional bar code is used to make out a selling invoice, medicines stock,etc. With PDF417 two dimensional bar code , the medicine trade logistics management system overcomes many difficult problems, makes the whole system to be more efficient, completes the plan, organization, coordination and control of trade partners, logistic, information ,business,finance etc., and strengthens the connection between the trade partners.

32 Game of Hospital-tient Relationship Under Asymmetric Information

GONG Xian-wen , WANG Yong , LI Ting-yu

2004, 27(4):126-129.

[Abstract](760) [HTML](0) [PDF 334.80 K](1622)

Abstract:
The hospital and patient are in the state of asymmetric information in the medical market, which could lead to moral hazard, adverse selection, and low market efficiency. By the game model, we analyze the game process and equilibrium between the hospital and patient under the condition of asymmetric information. The analyzing result suggest that asymmetric information in the medical market is harmful to the patient's benefit and the development of the medical market. Therefore, it's necessary to set up medical information opening system and strengthen the communication between the hospital and the patient so as to relieve the asymmetric information between hospital and patient.

33 Customer-orientation Degree of Film and Its Fuzzy Synthetical Evaluation

SHAO Bing-jia , LI Li

2004, 27(4):130-133145.

[Abstract](583) [HTML](0) [PDF 424.79 K](897)

Abstract:
The implement of customer-orientation strategy is very important for enterprises to achieve more profit and competitive advantage. Customer-orientation degree is a very important index for evaluating the condition of running and management. the principles of choosing index is completion, deputation, division, avail, correlation, economy and manipulation. According to the principles, An index system for synthetical evaluating customer-orientation degree is suggested. 28 indexes are measured off 4 parts that include the degree of understanding the customer-orientation strategy, the delicacy degree of responding, the degree of measuring implement and the degree of fulfillment. Finally, a two-layer fuzzy synthetical evaluation method is presented.

34 Change of the Interest Rate of Loan When CommercialBanks Become More Risk Averse

XU Ding~

2004, 27(4):134-137.

[Abstract](591) [HTML](0) [PDF 328.20 K](989)

Abstract:
Through the equation of balance sheet between assessment and debt, this paper reformulates the function with two stochastic process of credit risk and interest rate risk under the full consideration of the profile of the losses of bad debts of the commercial banks, deduces the function of loan rate under the maximum utility of profit margin of commercial banks. The Beyer's estimation is used to analyse the changes of the loan rate when the extent of the risk averse of commercial banks. The risk averse extent is raised from the Arrow-Pratt risk averse to Ross risk averse. It is pointed out that the more risk averse of a commercial bank, the even higher the interest rate the bank charges to its borrower.

35 Financial System and the Firm''''s FinancialBehavior in Transitional Economy

ZENG Hong~

2004, 27(4):138-141.

[Abstract](489) [HTML](0) [PDF 359.91 K](990)

Abstract:
On the basis of comparative analyses of the capital-market oriented and the bank oriented financial systems in the world, thispaper discusses the specialties of our country's financial system. Under this background, this paper builds an equilibrium model to explain the financial behaviors of firms in soft-budget constraint,the research results show that the soft-budget constraint is the main cause that leads to excessive loans .Because the different targets of governmentand firm, it's hard to optimize the firm's financial behaviors only by banking credit mechanisms, therefore, it is necessary to reduce the soft-budget constraint and establish effective incentive mechanisms of state-owned banks.

36 Economic Analysis of PrincipalParts of Engineering Project

REN Yu-long , WU Guo-sheng , XU-jin , ZHANG-yu

2004, 27(4):142-145.

[Abstract](482) [HTML](0) [PDF 312.09 K](1032)

Abstract:
This paper first makes behavioral analysis of principle parts of engineering project, then analyzes shirking problems of the two agents and some problems among principal parts based on principal-agent theory. We establish an orientation about the principal-agent relationship among principal parts according to the reality in our country. aimingto establish an effective incentive mechanism. We find it effective to stimulate the agents and prevent the agents from coalition. At last we give an example to show its use.

37 Relationship Between Ownership Structures and Performance inChinese Electronic Enterprises

ZHANG Wei-guo , WU Jing , CHEN Xue-mei

2004, 27(4):146-150.

[Abstract](533) [HTML](0) [PDF 430.35 K](221)

Abstract:
This paper investigates the relationship between ownership structure and corporate performance in Chinese electronic enterprises systematically, using ROA as the dependent variable while ownership concentration and structure as the explanatory variables. The empirical results show that:Chinese electronic enterprises' strength is not balanced and their ownership structure is very concentrated. Each of state ownership,legal person ownership and individual ownership has no significant effect on firm performance.

38 Impact of the Asset Reorganization Upon the Achievement of Listed Companies

CHEN Rong

2004, 27(4):151-153158.

[Abstract](562) [HTML](0) [PDF 292.61 K](171)

Abstract:
By compraring the financial datas of come into the maket company after reorganization,Draw conclusion by comparing and dealing with the samples that reorganizations through share assignment and asset seperation have a good effect while acquisition .merger and assect switch have a much less satisfactory effect , with a mention to the problems of reorganization at present , this article puts forward the proposal of a marketed and rational reorganization.

39 Sampling Investigation on Inhatitant Domestic Tap Water Consumption Situation and It’s Characteristics Analysis

FENG Ye-dong , LI Chuan-zhao

2004, 27(4):154-158.

[Abstract](528) [HTML](0) [PDF 319.38 K](160)

Abstract:
Economics.Through sampling investigation and analysis on inhabitant domestic tap water consumption situation,it is given that economic factors are the main factors influence inhatitant's water consumption.The functional relations among inhabitant's income and water consumption,water price and consumption are given. The tap water's income elasticity of demand and price elasticity of demand is analyzed, along with the fluctuating range month by month of inhabitant's water consumption.Finally ,this paper offers the reference data for planning the ability of water supply and making policies of ladder water prices.

40 Time-frequency Analysis of Heart Sound

ZHOU Jing , YANG Yong-ming

2004, 27(4):159-162.

[Abstract](511) [HTML](0) [PDF 303.33 K](131)

Abstract:
The structural defects of the heart are often reflected in the sounds that heart produces. Because of the non-stationary of the PCG signal, it is important to maintain its time-frequency character. We discuss the Short-Time Fourier Transform (STFT) method and the wavelet method. Some normal and abnormal heart sounds were analyzed by these methods. We can see the advantage and disadvantage of them obviously from the examples.

41 128×128 Pyroelectric IRFPA ROIC Parameters Detection With VI

XUE Lian , YUAN Xiang-hui , LU Guo-lin , HUANG You-shu y of Education , Chongqing University , Chongqing , China)

2004, 27(4):163-166.

[Abstract](598) [HTML](0) [PDF 431.20 K](122)

Abstract:
利用热释电红外焦平面阵列(IRFPA)进行红外成像是非制冷红外成像的主要技术途径之一,虚拟仪器技术的应用对新型器件的研制起到了积极的推动作用.采用基于虚拟仪器技术的IRFPA读出电路(ROIC)的参数测试系统,对新研制的128×128热释电ROIC进行了测试,获得了不同IC硅圆片上的ROIC芯片的主要参数,其中直流放大倍数Gdc≈10×,不均匀性NU＜4.5%,动态范围Dr＞64dB.测试系统具有良好的扩展性,为获得清楚的128×128热释电红外热像提供了技术支持.

Home

Volume 27,Issue 4,2004 Table of Contents

Current Issue

Volume

Issue

Most Read

Most Cited

Most Downloaded