Volume 27,Issue 7,2004 Table of Contents

  • Display Type:
  • Text List
  • Abstract List
  • 1  Stress Analyze of Medium Belt in Gear Transmission With Meshed Medium Belt
    ZHANG Guang-hui ZHU Xian-ling ZENG Rong-sheng ngqing China)
    2004, 27(7):1-5.
    [Abstract](569) [HTML](0) [PDF 349.28 K](161)
    Abstract:
    Gear transmission with meshed medium belt is proved feasiable which is, with lower vibration and noises, lower cost and energy saving. To realize "green lubrication". In the type of gear transmission, the medium belt is the feature component, also is one of the key components. The life of medium belt has great effects on the efficiency and performance of the whole transmission. However, in the process of transmission the medium belt is subjected to great tension stress, and easy to break. So we take measures to analyze the tension stress ,compression and friction forcel of the medium belt at first, and take it as the inference to select the materials of the medium belt.
    2  Synthetic Control Strategy for a Car With Hydro-mechanical Continuously Variable Transmission System at Standing Start
    LI Ming-guo QIN Da-tong HU Jian-jun SHU Hong ongqing China)
    2004, 27(7):6-9.
    [Abstract](573) [HTML](0) [PDF 350.35 K](243)
    Abstract:
    Continuously variable transmission (CVT) is the ideal transmission for automobile, it is also one of the most important research items of researchers and automobile companies all over the world. The dynamic simulation model is established and integrated control strategy of standing start is proposed for dual mode CVT vehicle, aiming at automatic vehicle with torque converter as a starter and metal pushing belt as a higher transmission equipment (Dual mode CVT vehicle), on the base of engine and torque converter performance experiment. Simulation result shows that vehicle performance can be improved by using the control strategy proposed. The research results provide the theory method of analyzing and designing for CVT vehicle.
    3  Twist and Rotate Speed Measurement Oriented Virtual Instrument Based on Qin''''s Model
    ZHANG Ying-hua YIN Ai-jun ZHOU Chuan-de CHEN Fa-bin ZHANG Da-ming
    2004, 27(7):10-14.
    [Abstract](661) [HTML](0) [PDF 506.81 K](146)
    Abstract:
    The paper introduces concepts and the general idea of Intelligent Virtual Controls based on Qin's Model,and advances a new instrumental mode ,that is Virtual Intelligent Twist and Rotate Speed Measurer ,which can be used in measuring the frequently used physical parameters in the rotate mechanical systems ,including twist ,rotate speed ,power and the axes-oriented force. The three-layered hiberarchy ,including the interface layer ,the testing and service layer and the hardware driving layer, is brought forward to design the Virtual Intelligent Twist and Rotate Speed Measurer ,which is a new creative method .In the hiberarchy, the lower layers provide the service and support to the upper ones, and the upper layers realize the functions of instruments with call-back of the lower ones .In the framework the three ones divide the work and cooperate well. An Virtual Instrument based on IVC-based-VI is successfully developed which is used in the twist and rotate speed measurement of the mechanical area.
    4  Two-level Fuzzy Method for Evaluation of the Supplier''''s System in Automobile Industry
    HUANG Ju~
    2004, 27(7):15.
    [Abstract](492) [HTML](0) [PDF 283.05 K](957)
    Abstract:
    This paper analyses the importance of the suppliers' evaluation in automobile industry. Based the conception of system, all the corporations' suppliers are regarded as an integer. On condition that the corporation has evaluated the single supplier's performance, the model for evaluate the performance of supplier's system is established, the performance by two-level fuzzy method is evaluated. Finally, the method sets with an example as the illustration.
    5  Application of BP NN for Engine Modeling
    HU Jian-jun QIN Da-tong YANG-Wei gqing China)
    2004, 27(7):18-20.
    [Abstract](715) [HTML](0) [PDF 281.94 K](1192)
    Abstract:
    The Neural Network(NN) is widely applied to many fields for its unique structure and the method of managing information. The basal concept of the NN and the applied method in the field of engine engineering are introduced. Furthermore, a unique NN structure is also established for the output torque of JL474Q1 engine. It affords the theory base to find the best matching strategy between engine and the transmission system of vehicle.
    6  Virtual FFT Spectrum Analyzer Based on DSP Technology
    WU Hong-gang QIN Shu-ren
    2004, 27(7):21-23.
    [Abstract](638) [HTML](0) [PDF 290.70 K](870)
    Abstract:
    Virtual Instrument has become an important direction of instrument development, now it has been widely used in many fields. FFT analysis is a widely used method in mechanical engineering, fault detection and many other fields. However, the traditional FFT analyzer is expensive and is not easy to upgraded. The birth of virtual FFT Spectrum Analyzer gets rid of the limit of traditional FFT analyzer, and paves the way for the application of FFT analyzer. The uses of DSP technology make the future broadened of Virtual Instrument. This article ,based on the deep study of DSP system, designs a virtual FFT Spectrum analyzer based on DSP technology. The design is new and of great practicality, which indicates the important role of Virtual Instrument in the development of instruments.
    7  Effects of Stitcing on the Buckling Strength of Stitched Composite Laminates
    WEI Yu-qing~ CHEN Bin~
    2004, 27(7):24-27.
    [Abstract](582) [HTML](0) [PDF 290.30 K](982)
    Abstract:
    A theoretic model is proposed based on the mechanism of the buckling failure of the stitched composite laminates containing delaminations. The buckling strength of the stitched composite laminates under the in-plane compressive load is predicted. The critical percentage elongation of the stitching thread is taken into account as a control parameter of the buckling failure. The energy method is used to calculate the buckling strength of the stitched composite laminates, and the minimal potential energy is used to calculate that of the unstitched composite laminates. The result shows that the buckling strength of the stitched composite laminates is larger than that of the unstitched composite laminates. The effects of stitching technical parameters such as the stitch thread diameter, stitch step and stitch space on the stitched composite laminates are also analyzed.
    8  Bridge Deformation Monitoring With Tiltmeter
    HE Yong-qi CHEN Wei-min FU Yu-mei
    2004, 27(7):28-31.
    [Abstract](478) [HTML](0) [PDF 338.05 K](1065)
    Abstract:
    Tiltmeter is a kind of sensor for tilt measurement. Comparing to other technologies, tiltmeter has so great unique performance that it is proposed for bridge deformation testing or monitoring wildly abroad. We introduce some kinds of tiltmeters and the way how they work. In addition, some examples application to bridge deformation are presented.
    9  Fuzzy Control and Simulation of Regulating System for Permanent Magnet Synchronous Motor
    RAN Zhen-ya~ YANG Chao~ CAO Wen-ming~ ZHAO Shu-en~
    2004, 27(7):32-35.
    [Abstract](713) [HTML](0) [PDF 355.49 K](1109)
    Abstract:
    This paper researches the fuzzy control and simulation of regulating system for PMSM in electrical vehicle. The mathematics model is set up.The PMSM,the PMSM measures demux, dq to abc converter and the three phrase PWM converter models are set up in MATLAB/ Simulink. The fuzzy controller is designed with two dimension fuzzy design method, and take E and EC as input variable, U is the output variable. According to the controller and models, the fuzzy control model of regulating system for PMSM is created in matlab/simulink. At last, to test the accuracy of the control method with the simulation result.
    10  Mechanism and Progress About Protein Crystal Growth by Atomic Force Microscopy
    WANG Sheng~
    2004, 27(7):36-39.
    [Abstract](790) [HTML](0) [PDF 359.72 K](1219)
    Abstract:
    Atomic Force Microscopy(AFM) plays a very important role in researching crystal growth mechanism, especially protein crystals. The principle of AFM for protein crystal examination is briefly described as well as the importance of research on protein crystal growth, known growth mechanisms including 2-D steps nucleation, spiral dislocation, normal growth, 3-D nucleation and anisotropic development, and latest progress about eucommia antifungal protein(EAFP) and Trichosanthin(TCS) protein crystal growth mechanism, respectively. Finally, protein growth under microgravity environment is also expounded here and their development tendency and practical prospect.
    11  Experimental Analysis on the Physicochemical Characterization of Kiel Bone
    HE Chuang-long WANG Yuan-liang YANG Li-hua ZHANG Jun CAO Yang WU Ke-da nistry of Education College of Bioengineering Chongqing University Chongqing China)
    2004, 27(7):40-44.
    [Abstract](1013) [HTML](0) [PDF 446.77 K](1012)
    Abstract:
    Xenograft bone such as Kiel bone has long been used as a grafting materials,but the results of Kiel bone application in clinic are still controversial due to it's some drawbacks. To investigate the novel procession method of xenograft bone, the physicochemical characterization of Kiel bone and it's relationship with the clinical application are studied. Kiel bone is prepared from bovine femoral cortical bone according to Salama's methods.The bone specimens are characterized with a number of physicochemical methods such as FTIR spectroscopy, X-ray diffraction spectroscopy , differential scanning calorimetry (DSC) and uniaxial tension mechanical tests. The result indicates that Kiel bone is composed of hydroxyapatite and organic component ,and the deproteination of Kiel bone is imcomplete, but processes with hydrogen peroxide, the collagen is denatured which reduce the mechanical properties of materials. The immunogenicity of Kiel bone is weakened since the main antigenic protein is removed and collagen is denatured, which not only weakens the strength of materials but influences on it's physiological property, all make the osteoinductive properties of materials unideal. To overcome these problems, it is necessary to develop the novel procession method of the xenogeneic bone.
    12  A Survey of Power Flow Tracing Algorithm
    MA Ling XIE Kai-gui ZHOU Jia-qi ZHOU Ping ZHAO Yuan ZHAO Xia Under the State Ministry of Education Chongqing University Chongqing China)
    2004, 27(7):45-49.
    [Abstract](1061) [HTML](0) [PDF 494.30 K](1523)
    Abstract:
    Competition in the electricity markets requires identifying the responsibility in the use of transmission networks or the associated effects. Power Flow Tracing algorithms have been developed recently to enhance the transparence of transmission system. This paper focuses on power flow tracing procedures and provides a detailed comparison of three classified algorithms: 1) power flow tracing based methods; 2) current tracing based methods; and 3) power flow analytic methods. The advantage and disadvantage of each method are discussed. Finally, the potential applications and development of the methodology is presented for furthermore research.
    13  Correlation Dimension Analysis on Heart Rate Variability Signal
    ZHU Jia-fu~
    2004, 27(7):50.
    [Abstract](755) [HTML](0) [PDF 337.05 K](1326)
    Abstract:
    Heart rate variability is an important index to express the tensility and balance of the parasympathetic-sympathetic nerve, and it is valuable to diagnose heart and blood disease in clinical diagnosis. It is approved that HRV signal possess non-linear characteristic, and we can analyse and present HRV signal with non-linear dynamic parameteres, such as fractal dimension. Based on phase-space reconstruction theory, an improved algorithm is introduced to calculate the correlation dimension of HRV signal, and some valuable conclusions are expressed according to the result which is concluded from the correlation dimension of nearly 30 samples.
    14  Improvement of the Luminescent Performances of CaTiO3:Pr3
    LI Zhi-xia ZHANG Yu-qi LIAO Liang
    2004, 27(7):53-55.
    [Abstract](836) [HTML](0) [PDF 235.53 K](167)
    Abstract:
    Long after-glow red phosphors CaTiO_3:Pr~(3+),X~(3+)( X~(3+)=Gd~(3+),Dy~(3+),Tb~(3+),Eu~(3+)) were prepared by Solid State reaction process. The excitation spectrum, emission spectrum, XRD and the curve of afterglow decay were investigated. The decay curves indicate the luminescent performance is improved by co-doped the other three ions except Gd~(3+). Co-doping with Tb~(3+) and Eu~(3+) the excitation spectrum is a broad band , the main excitation spectrum and the subordinate excitation spectrum are red-shift. The absorption at 458,478,482 nm and 496 nm are increased. The emission spectrum peaking at 614 nm is due to a transition from ~1D_2-~3H_4 of Pr~(3+).The results of XRD reveal there is CaTiO_3 phase and the co-dopant isn't change the crystal field notably.
    15  Dynamic Control Arithmetic and Modeling of Secondary Cooling System for ROKOP Billet Continuous Casting
    CHEN Deng-fu~ SUN Hai-feng~ FENG Ke~ BAI Chen-guang~ DONG Ling-yan~ WEN Liang-ying~ ZHAO Zhan-feng~
    2004, 27(7):56-59.
    [Abstract](629) [HTML](0) [PDF 307.19 K](125)
    Abstract:
    A dynamic control arithmetic and mathematic model of secondary cooling system for ROKOP billet concasting has been developed in view of the changes of casting speed during concasting process and the high fluctuation of surface temperature due to the use of static control method. By means of computer simulation and by comparison between static and dynamic control method, it proves that the latter one is more adaptive to the changes of casting speed, which leads to lower fluctuation of surface temperature.
    16  Effect of Marangoni Number of Liquid on Marangoni Convection in Liquid Bridge
    PENG Lan LI You-rong ZENG Dan-ling
    2004, 27(7):60-64.
    [Abstract](734) [HTML](0) [PDF 351.36 K](177)
    Abstract:
    The physical and mathematical model of the Marangoni convection in liquid bridge with liquid encapsulation (or two immiscible coaxial liquid columns ) are established. A numerical simulation of the Marangoni convection in liquid bridge with liquid encapsulation is performed by employing vorticity-streamfunction method and the Alternative Direction Implicit scheme in finite difference. The distribution of temperature and flow in two liquid columns are then obtained. The influence law of Ma number of liquid encapsulation to the Marangoni convection in liquid bridge with liquid encapsulation is obtained.
    17  Indentation Cracking Mechanical Analysis of ZrO2 Laminated Ceramics
    CHEN Bei~
    2004, 27(7):65.
    [Abstract](381) [HTML](0) [PDF 299.49 K](159)
    Abstract:
    The formation of indentation cracking has some relationship with the transformation stress induced by martensitic transformation, besides the relationship with the residual stress by volume change in the plastic zone in ZrO_2 laminated ceramics. Whereas surface residual compressive stress controls the expansion of surface cracks. Contributions of the transformation driving force and surface compressive stress are not considered in the traditional indentation theory. Therefore, fracture toughness value measured by the traditional method is usually lower than the practical one in ZrO_2 laminated ceramics. When indentation-fracture method is used, the value is more reliable.
    18  Method for Stabilization of n-Type Porous Silicon via Photochemical Reaction
    LI Xue-ming~ JI Xin-rui~ YANG Jian-chun~ PAN Jin~
    2004, 27(7):68-71.
    [Abstract](543) [HTML](0) [PDF 339.95 K](190)
    Abstract:
    以n型单晶硅为基底材料,采用电化学阳极氧化工艺和光化学氧化后处理工艺制备氧化多孔硅,利用扫描电子显微镜、红外光谱仪、荧光光谱仪研究氧化多孔硅形成前后的表面形态、组成、光致发光、耐碱性的变化.结果表明:光化学氧化后处理使n型多孔硅表面岛状硅柱间沟槽变窄,结构中出现Si―O键(波数1 146 cm-1和1 140 cm-1)、OSi―H键(波数2 254 cm-1)振动峰,在碱性介质中具有一定的耐蚀性;空气中贮存50 d,氧化多孔硅光致发光强度下降缓慢,发光峰位置无明显变化,具有良好的光致发光特性.
    19  Analysis and Countermeasures of the Power Noise During High Frequency PCB Design
    LI Yong-ming ZENG Xiao-ping
    2004, 27(7):72-74.
    [Abstract](438) [HTML](0) [PDF 215.39 K](205)
    Abstract:
    The paper analyses many forms of power supply noise interference in the high frequency PCB and the relevant reasons. Combining several formulas with the relevant engineering experience, the authors bring forward a lot of related means; finally conclude the chief principle that controlling power noise should abide by.
    20  Traffic Impact Evaluation System of City Building Projects
    PAN Dong-bo~ YANG Tian-yi~ HUANG Tong-yuan~
    2004, 27(7):75-77.
    [Abstract](582) [HTML](0) [PDF 273.61 K](211)
    Abstract:
    Lots of city building projects will consequentially affect the usual traffic, now, with the development of economic in our country, the city traffic will endure more and more pressure, so it is important and necessary to evaluate the traffic impact during the stage of program. Through the analysis about the traffic impact in our country, this article takes use of the "district-road network" theory to evaluate traffic, and at last come into being a traffic impact evaluation system based on software, finishes the basic function of traffic impact evaluation.
    21  Improved Genetic Algorithm and Its Application in TSP
    ZHANG Chun-tao~
    2004, 27(7):78-81.
    [Abstract](549) [HTML](0) [PDF 322.48 K](149)
    Abstract:
    Crossover operator and mutation operator are basic operators of genetic algorithm , which play important roles in improving the quality of the solution populations. We propose the improved crossover operator , mutation operator and rotation operator on the basis of good point set with the traveling salesman problem , the experimental result shows these operators are very efficient.
    22  Approaches and Applications of Chemomics and Chemoinformatics
    LI Zhi-liang~
    2004, 27(7):82-85.
    [Abstract](695) [HTML](0) [PDF 364.51 K](195)
    Abstract:
    Some novel concepts of chemomics/molomics are proposed including hydrocarbomics, alcophenomics, carboxomics, pepitomics, metabonomics, etc. like genomics, protomics and glycomics in bioomics. Some examples are given to demonstrate the chemomics and/or molomics methodology and technology based chemoinformatics and bioinformatics and their wide applications in Chemistry and Biology.
    23  Structure and Application of SPKI Certificate
    CHEN Fei-zhou WANG Qian ZHU Qing-sheng
    2004, 27(7):86-89.
    [Abstract](1069) [HTML](0) [PDF 397.97 K](323)
    Abstract:
    SPKI (Simple Public Key Infrastructure) can be used for access control. It emphasizes decentralization. SPKI certificate can be generated by any keyholder to empower to grant or delegate the authorization in question. The application should commit the SPKI certificate to the server and the server independently decides to offer service or not rather than deciding by Certificate Authority. SPKI certificate largely uses the public keys of entities instead of their names. The certificate of SPKI is applicable to the model of B to C electric commerce. This paper introduces the fundamental theories of SPKI, including the certificate's structure, the principle of 5-tuple reduction, SDSI name, the advantage of SPKI and so on. In the end, the paper instances the SPKI-based multi-channel payment system to illustrate the SPKI certificate.
    24  Information Retrieve Strategy for Subject Meta Search Engines
    LV Chuan-yu~ LI Hua~ GEN Hu~
    2004, 27(7):90-93130.
    [Abstract](773) [HTML](0) [PDF 447.98 K](865)
    Abstract:
    Present meta search engines are key-based information retrieve. A plenty of irrelevant information is returned when user search some professional knowledge because Simple combination of key can not express accurately user's purpose. Subject meta search engines solve the problem. Based on the study of present technologies of meta search engines and domain knowledge base, an information retrieve strategy is put forward which is fit for subject meta search engines. It effectively improves efficiency and precision of information retrieve. The main content of this paper are to introduce the key idea and technologies of the retrieve strategy.
    25  Study on Process Capability Indices for Mass Customization
    LI Ben-bo LI Chuan-zhao HE Li-juan ZHAO Peng
    2004, 27(7):94-96.
    [Abstract](792) [HTML](0) [PDF 227.19 K](1236)
    Abstract:
    Mass customization is a kind of fine-new production mode that corporations make individual customization for every customer's requirements by advanced technologies and managerial methods while the costs and time are the same as the volume-production. This paper analyzes the conception and characters of mass customization. And it reviews the current research of Process Capability Indices (PCI) of variety-and-batch production home and abroad. Volume-production and mass customization are compared in the paper. On the basis of discussion of the point estimates and lower confidence limits of SPC, it brings forward the method to fix on PCI of mass customization.
    26  A Methodology of Classification of Product Family for Mass Customization
    LAN Lin-chun DAN Bin FENG Tao ZHANG Xu-mei
    2004, 27(7):97-101.
    [Abstract](817) [HTML](0) [PDF 342.42 K](890)
    Abstract:
    Product family management is a key support technology to implement mass customized production. Various products in product family are similar in functional characters, physical characters and technological characters, which is an important character of product family. Based on the products represents and mapping relations in functional domain and physical domain, a method of classifying product family is presented by comparing similarity of both functional requirements in functional domain and design parameters in physical domain. The process of classifying product family by virtue of this method is also discussed. At last, a case is introduced to illustrate the application of this method.
    27  Computing Method of America Option Under the Basis of Black-scholes Formula
    PU Xing-cheng~
    2004, 27(7):102-104.
    [Abstract](937) [HTML](0) [PDF 249.90 K](1516)
    Abstract:
    On the basis of the theory of option pricing,We study the connection between America call option and European call option;Under the assumption condition of Black-Scholes formula ,use the theory of martingales and stopping time,get the conclusion that: the price of America call option equals the price of European call option; Discuss some numeric computing methods of the put America option pricing, with the invarional inequaility for optimal stopping, prove the boundary property of America put option price and introduce some numeric computing methods of the put America option price.
    28  Game Analysis of Banking Supervision
    CAI Jing-min PU Yong-jian PENG Xiao-bing
    2004, 27(7):105-108.
    [Abstract](420) [HTML](0) [PDF 280.52 K](799)
    Abstract:
    Banking has a high gearing lever and its operators are keen to the risk projects with the lure of high income. The supervision sector should regulate the banks and force them to reduce risks to ensue the healthy circulation of county's economy. The supervisor should report the disclosed risks to the supervision sector so that they can alert the risks in advance and control them ,but the sector must take action to prevent the collusion between the operators and supervisors.
    29  Application of Modern Credit Risk Measurement and Management
    YAN Tai-hua CHENG Ying-shan LI Chuan-zhao
    2004, 27(7):109-113.
    [Abstract](611) [HTML](0) [PDF 440.02 K](1322)
    Abstract:
    A model of credit quantitative measurement and management widely used in foreign countries is introduced, and its limitation which appears while the model is used in China is analyzed. According to the chaos time serials constituted by various period credit grades' transition probability of an enterprise and the average value of its ratio of callback due to breach of faith, applying the theory of the chaos time serials and the local prediction method, a credit grades' transition matrix and a matrix of the average ratio of callback due to breach of faith is established. Which is applied to Chinese enterprises. Thus, a credit risk quantitative measurement and management model which is adapted to commercial bank is established, which is important in theory and practice.
    30  Economic Loss Assessment of Ecological Damage of Land Resources in the Process of Urbanization:A Case Study of Wanzhou District, Chongqing City
    LI Jing-hui YANG Xing LIANG Zhi-rong QIN Lin
    2004, 27(7):114-117.
    [Abstract](512) [HTML](0) [PDF 306.21 K](976)
    Abstract:
    With the improvement of urbanization's level, the destroys of land resources become severer and severer, and the expense is huge. According to their features, land resources can be classified as environmental loss, available ecological loss and land restoration costs. By studying the principle and technique of evaluating these three losses, we put forward quantification pattern of ecological loss of land resources. The research of Wanzhou district, Chongqing city indicates that the number of total ecological loss of land resources during the urbanization from 1995 to 2001 is about 344.70 millions yuan, it is 4.70% of GDP in 2001. In the mass, Wanzhou district is not in a sustainable development because the ecological loss of land resources during the urbanization continually increased.
    31  Investigate to Water Resource and the Dispatch to Water Capacity in LIJIANG
    YU Ze-bin LONG Teng-rui SHI Lian WANG Dun-qiu
    2004, 27(7):118-121.
    [Abstract](651) [HTML](0) [PDF 400.39 K](976)
    Abstract:
    The tremendous seasonal variation of rainfall and the relative little dispose capacity of sewage are the main reason of the lack of water quantity and the contaminate of water quality in low water season in LIJIANG. Adjusting water quantity is an important measure to resolve the problem. So, the author does an investigation on water resource of LIJIANG, calculates upper-water supply and requires equation. As a result, in the condition of no water adjust, and if in the extraordinary year of the lack of water quantity, the water flow will fade in 2010, and the demand of water quantity of 30 m~3/s in the season of the lack of water will not be satisfied. Based on the actuality of water resource, the thesis introduces the project of mending water reservoir to LIJIANG,analyzes its feasibility in the respect of technique and financial condition,brings forward major problem of the project. The result proves the benefit of the project in the field of environment,economy society is very prominent, and the project is an engineering to realize water resource of LIJIANG reasonable utilize; for the reason to guarantee this project to bring into play its function,it is time to carry out integrate management to water resource and water environment in LIJIANG valley.
    32  Calculation and Analysis of Finite Elements for Necked-inward Varied-section-beam
    HAN Feng YUAN Zheng-qiang LI Zheng-liang HUANG Jian
    2004, 27(7):122-125.
    [Abstract](418) [HTML](0) [PDF 316.05 K](1445)
    Abstract:
    The calculation and analysis of static and modal are fulfilled with ANSYS for the entire super-architecture, its results are compared with that with TBSA and prepared for later pattern of particular analysis of finite elements. The new material pattern so-called Necked-inward Node is presented for necked-inward varied-section beams of super-architecture, ordinary software but ANSYS for the analysis of pattern is not fit.
    33  Analytic Method for the Free Vibration of Plane Frame Structure
    ZHOU Mao-sen CHEN Zhao-hui
    2004, 27(7):126-130.
    [Abstract](710) [HTML](0) [PDF 379.95 K](1225)
    Abstract:
    The analytic method for the free vibration of plane frame structure is presented. It is achieved by transforming the general eigenvalue problem of natural frequency and vibration mode of continuously distributed property system into typical boundary value problem of ordinary differential equation (ODE). A series of ODE, corresponding to the general eigenvalue problem, is formed, and then is solved by an general ordinary differential equation solver-COLSYS. Each component of a frame structure is regarded as an element in the analytic method. This makes it more efficient than that of finite element method which needs to increase elements to get the value of high-class natural frequency and vibration mode accurately. Some applications of the method show that it can solve the free bending vibration of plane-frame structure with various types of displacement constraint. The result indicates that this method is precise and efficient.
    34  Method of Geometric Rectification on Scanned Image From Papery Topographic Map
    LI Hua-rong~
    2004, 27(7):131-134.
    [Abstract](679) [HTML](0) [PDF 297.22 K](181)
    Abstract:
    As a result of multiple factors, Scanned Images from papery topographic map will present the distorting errors. For the sake of rectifying the errors, the geometric rectification on scanned images is discussed. Based on the theory of finite element and the technology for image processing, the method of rectifying the distorting errors on the scanned image is presented. The method takes full advantage of reference points on the topographic map, and the region of map is partitioned into some quadrilateral elements by reference points, then bilinear equation is adopted to rectify the quadrilateral region one by one. The method not only makes the best of information of reference points, but also avoids operation of polynomial equation. Precision of rectifying the distorting errors on the scanned image is remarkably enhanced.
    35  M-Band Scale Similarity Transform
    MAO Yi-bo
    2004, 27(7):135-138.
    [Abstract](635) [HTML](0) [PDF 259.67 K](160)
    Abstract:
    M-Band scale similarity transform (MST) is introduced and its properities are investigated. MST has relation to approximation order. One can increase approximation of M-band multiscaling functions with help of MST.
    36  Dynamic Identification System and Application
    ZHANG Liang~ ZHANG Jia-liang~
    2004, 27(7):139-142.
    [Abstract](642) [HTML](0) [PDF 380.46 K](179)
    Abstract:
    Novel and secure dynamic identification system comprises electrical tokens, a secure identification server, a management workstation and application Programming Interface. Dynamic password is generated with synchronous and asynchronous identification algorithms. Since there is no correlation between passwords, they cannot be predicted, traced, intercepted or decoded. Thus the reliability of identification is enhanced. This paper first introduces principles of synchronous and asynchronous identification based on time and events, and then gives a through analysis of security in dynamic identification techniques. A brief introduction is given about identification issues in current stock industry. With event-based synchronous identification as an example, we give a detailed introduction of dynamic identification techniques with the application in stock exchange and integration of identification system and client system.
    37  Implementation of the Computer Operating Exam System of Computer Graded Examination Based on C/S
    LI Qi
    2004, 27(7):143-145158.
    [Abstract](736) [HTML](0) [PDF 304.95 K](147)
    Abstract:
    This paper introduces an exam management system, which is applied to the Computer Operating Exam System of Sichuan Computer Graded Examination, aims at the shortage of existing exam ways and exam manager systems. The system bases C/S mode, use SQL Server as background database engine, use Delphi as foreground Development tool, includind data and exam management. It is an independent and comprehensive system, and also can band of existing exam manager system of Sichuan Computer Graded Examination. The system is proposed with emphasis on working-flow, frame, main functions and the solution ways of the key problems.
    38  Summary of Magnetic Bearing and Application Research
    JIANG Qi-long LIAN Ji-san
    2004, 27(7):146-151.
    [Abstract](581) [HTML](0) [PDF 554.12 K](363)
    Abstract:
    Magnetic Bearing, a new type of bearing, have been regarded widely in the field of engineering and science because of its excellent performances, non-contact,high speed,long life, lubricant, and broad application , as one of reseach objects in the field of mechan-electronical engineering and control. The history, category ,advantages, research status ,control methods and development trend are presented,as well as some problems which need more studies. The research is emphasized in the application and digital control technologies of DC active magnetic bearing in high power and high speed rotary machines.
    39  Model of Real Estate Portfolio Investment Based on the Least Risk
    XIANG Wei-min
    2004, 27(7):152-154.
    [Abstract](683) [HTML](0) [PDF 270.92 K](187)
    Abstract:
    The high-speed development demands new real estate investment theory. Using the experiences of the Western developed countries for reference in property investment and modern portfolio investment theory, the paper introduces the conception of systematic and unsystematic risk with the centre of risk and profit. Consequently, the model of real estate base on least risk and anticipated profit is studied in the discussion of its concerned hypothesis and determining the concerned parameters. With living example analysis, we reach the conclusion that portfolio investment risk is smaller than single investment if the investor adjusts the tactics of portfolio investment.
    40  Sharp Upper Bound on the Laplacian Spectral Radius of Graphs
    WEI Yi-ping~ YIN Shu-hua~ SHU Jin-long~
    2004, 27(7):155-158.
    [Abstract](614) [HTML](0) [PDF 224.22 K](244)
    Abstract:
    设G是n阶简单连通图,顶点度序列为d1≥d2≥…≥dn.本文利用矩阵变换的方法给出了图G的拉普拉斯谱半径的新上界,并证明了达到该上界的极图仅有正则二部图或星图.同时还证明了在一定条件下,该上界改进了Li,Liu和Shu等人同类的结论.

    Current Issue


    Volume , No.

    Table of Contents

    Archive

    Volume

    Issue

    Most Read

    Most Cited

    Most Downloaded