Table of Content

20 March 2003, Volume 31 Issue 3

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Electronics, Communication & Automation Technology

A New Search Algorithm for Global Optimization：Population Migration Algorithm（I）



Zhou Yong-hua Mao Zong-yuan

2003, 31(3):  1-5. 

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 A comparative study of global function optimization and population migration shows that there are similarities between the two processes．In this paper‚a new search algorithm for global optimization—population migration algorithm（PMA） is proposed by the simulation of population migration．The algorithm mainly simulates population transition with economics and dispersion with population pressure increment‚the former encourages the algorithm to search in a region with good solutions‚the latter avoids getting stuck in a local optimum to a certain degree．Numerical experiment proves the global optimization capability of PMA．


Traffic & Transportation Engineering

Polymer Measurement in Solid Conveying with Computed Tomography



Li Li-fu Wang Bo

2003, 31(3):  6-10. 

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This paper presents the image measurement and analysis method with computed tomography for polymer in solid conveying．It utilizes the knowledge of nuclear physics‚photo-electricity‚polymer physics‚computer technology and mathematics synthetically‚the polymer morphology in solid conveying can be visually obtained by the interaction of polymer atom or polymer chain and the photon beam caused by γ-ray‚in which the photoemission‚Compton effect and electron pair effect will be generated．The experimental results indicate the method can not only measure the deformation and morphology of polymer in the way of non-open‚non-destroy and on-line‚but also find the relationship between the morphology and the mechanical properties of polymer in solid conveying．


Computer Science & Technology

A New Stroke-based Directional Feature Extraction Approach for Handwritten Chinese Character Recognition



Gao Xue, Jin Lian-wen, Yin Jun-xun, et al

2003, 31(3):  11-14. 

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 A new directional feature extraction approach based on stroke directional decomposition of a Chinese character is proposed．Without extracting the skeleton or contour of the character‚the four directional sub-patterns‚namely‚horizontal‚vertical‚left up diagonal and right up diagonal sub-patterns are obtained directly by analyzing the stroke directional characteristics of the character．Then five kinds of elastic meshing methods are presented to extract cellular directional features．Finally‚experiments on handwritten samples from HCL2000are carried on which prove the effectiveness of the proposed approach．


Chemistry & Chemical Engineering

Research on the Electrodeposition of Amorphous Fe-N- i Cr Alloy in Trivalence Chrominium Aqueous



He Xiang-zhu, Zeng Zhen-ou, Peng Rong-hua, et al

2003, 31(3):  15-20. 

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 A new type of Fe2＋ ‚Ni 2＋and Cr 3＋ chloride aqueous plating bath‚which is environmentally harmless‚steady and excellent‚has been proposed for the electrodeposition of amorphous Fe-N- i Cr alloy containing45％～55％ Fe‚33％～37％ Ni and9％～23％ Cr（mass fraction）．The method of the electrodeposition of amorphous Fe-N- i Cr alloys has been optimized through orthogonal experiment‚and amorphous Fe-N- i Cr alloy deposits with a mirror-like appearance‚which contains54．4％ Fe‚33．9％ Ni and11．7％ Cr（mass fraction） and with the microhardness（HV） up to560and the thickness up to11．3 μ m‚were obtained at room temperature and with20min electroplating．Inductively Couple Plasma Atomic Emission Spectrometry （ICP-AES）‚X-ray Diffraction （XRD）‚Scanning Electron Microscope （SEM） and X-Ray Spectrometry were used to characterize the properties of the Fe-N- i Cr alloy deposits．Experimental results show that the effects of electrolyte factors on the composition of the Fe-N- i Cr alloy deposits are distinct‚while the effects of electrodeposition operation conditions on the physical properties of the alloy deposits are distinct．Only in the case of the stabilizer H-W being used in the plating baths‚is chrominium presented in the alloy deposits．Because of the mixed effect of stabilizer H-W and additives‚Fe-N- i Cr alloy deposits obtained by the novel technology are amorphous．


Power & Electrical Engineering

Robust Stability on Nonlinear Neutral Systems with Uncertain Time-delay



Bao Jun-dong Deng Fei-qi Luo Qi

2003, 31(3):  21-24. 

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In this paper‚the robust stability of a class of nonlinear neutral differential systems with bounded norm and uncertain time-delay is considered．The delay-dependent criteria for the stability of nonlinear neutral differential systems are obtained．

Computer Science & Technology

Research on the System of Virtual Graphics Scanner in Internet and its Realization



Chen Jin-chang Chen Chi-kun Li Jie

2003, 31(3):  25-27. 

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A method of developing virtual graphics scanner in Internet with the technology of Java Applet is discussed in this paper．The working principle of Java Applet‚the system design‚system integration and the devel opment environment of the scanner are investigated．Thus a useful virtual graphics scanner for the design of inside decoration is presented．



Mechanical Engineering

Remote Monitoring and Controlling System for Metallurgical Microscope Based on WAN



Pei Sheng-wei, Feng Hai-yan, Yan Jun, et al

2003, 31(3):  28-31. 

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The remote monitoring and controlling system for a large scale metallurgical microscope is introduced in this paper．This system transmits control signal by WAN（Wide Area Network）‚and controls the metallurgical microscope remotely by micro-controller and computer．The dynamic self-adaptive coding arithmetic is also put forward in this paper‚thereby resolves the contradiction between transmission speed and data quantity‚and realizes the rea- l time transmission of digital video signal．


Power & Electrical Engineering

Analysis to Typical Control Circuit According with Safety for Man and Machine in Industry Control System



Chen Li-ding Tang De-ming

2003, 31(3):  32-35. 

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Technical principles and specifications of the five-safety grade standards in industry control system are introduced in this paper．The standards accord with IEC60204-1and EN954-1．On the basis of each safety grade’s characteristis‚some typical circuits are given and their working principles are analyzed．


Chemistry & Chemical Engineering

Concentration Polarization Ratio Model of Ultrafiltration in Electric Field



Chen Shan, Cai Miao-yan, Guo Si-yuan, et al

2003, 31(3):  36-39. 

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According to the phenomenon of concentration polarization in electro-ultrafiltration process‚the model of concentration polarization ratio was established based on the principle of mass conservation mechanism and the theory of adsorption-diffusion．The influence factors of concentration polarization ratio such as solute electrophoresis rate and adsorption-diffusion were analyzed．


Food Science & Technology

Decolorization of Refinery Effluent and Polysaccarrides Preparation by Polystictus Versicolor



Ran Yan-hong, Yu Shu-juan, Yang Lian-sheng, et al

2003, 31(3):  40-44. 

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Four Polystictus versicolor strains such as PVC0‚PVC1‚PVC2and PVC3were examined for their ability to decolorize refinery effluent‚which contains Melanoidin‚HADP’S and Caramel．The preparation ability of the four strains for mycelium polysaccarride was also studied．The results show that Polystictus versicolor has high decolorization ability on effluent‚and can produce mycelium PSK and extracellular PSK at the same time．Colorants will not cause the change of PSK structure‚and PVC0 is the best strain for decolorization and PSK preparation．


Screening of Cellulase-producing Strains and Growth Conditions of Enzyme



Li Hai-bin, Li Lin, Huang Ri-bo, et al

2003, 31(3):  45-48. 

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Thermomonospora fusca was chosen as an original strain for screening high yield cellulase mutants．Spora suspension of the organism was treatment with UV for60s and80s alternately．A high cellulase-producing mutant strain PE-211was obtained by screening using the methods of transparent zone and shaking culture．The activity of mutant strains PE-211was enhanced for more than one time comparing with that of the original strain．The CMCase-producing conditions of PE-211were studied too．


Mechanical Engineering

Positive Solution of a Semilinear Elliptic Equation with Critical Exponent 



Yao Yang-xin Chen Zhi-hui Fu Yi-ping Fu Hong-zhuo

2003, 31(3):  49-52. 

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 In this paper‚the existence of the positive solution of the follwing semilinear elliptic equation with critical exponent is studied：
－div（｜x｜β ∇ u）＝｜x｜ α u p－1 ＋λ｜x｜ σ u q－1 in Ω‚u＞0in Ω‚u＝0on∂Ω‚
by using Sobolev-Hardy inequality and the Mountain Pass Geometry．


Mathematical Sciences

Existenceof PositiveSolutions for Quasilinear Elliptic Equations in R^N



Fu Hong-zhuo Yao Yang-xin Shen Yao-tian

2003, 31(3):  53-56. 

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This paper is concerned with the existence of the weak positive solution of the following nonlinear Dirichlet problem on some conditions：－div（|∇u|p－2 ∇u）＋ a（x） u p－1 ＝ h（x） u q ＋ u p ∗ －1 ‚x ∈ R N ‚u ≥0‚u ≢0‚∫R Na（x）|u|p dx ＜＋∞．Where a： R N →R is continuous and nonnegative‚h： R N →R is some integrable function and2≤p＜N‚p2 ≤ N‚0＜q＜ p2 （p－1）N－p－1‚p ∗ ＝NpN－p ．Some results as p＝2or sub-critical exponent are generalized toP-Laplacian and critical exponent on weaker conditions‚and some results as a（x）＝0are generalized too．


Application of Regression Analysis to the Construction of New Stock’s Price Model



Guo Guo-xiong Chen Ling Luan Chang-fu Lu Zi-qiang

2003, 31(3):  57-59. 

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According to the peculiarity of A type stock market in China‚by suing statistics and financial analytical methods‚the factors influencing the new stock’s price are anslysed．Through the linear regression analysis of the stocks’relative data‚the power value of each facter is obtained‚and a mathematical model to forecast the opening price in the first day of new stock is established．Based on the model‚a computer system is developed．The practice indicates this system is useful to make decision of the investment with new stock’s.


Traffic & Transportation Engineering

Crash Simulation Analysis for Sedan Car’s Tubular Frame Bodywork



Huang Xiang-dong Chen Jin-hua Xie Yue-cong

2003, 31(3):  60-63,68. 

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 Ful- l frontal crash simulations of a car’s tubular frame bodywork developed on our own responsibility are conducted by using nonlinear CAE tools．Time histories of deformation and main collisional parameters are obtained and analyzed．Partial improvements and modifications of the frame are made according to simulation results‚which indicate that such novel car body is capable of coming up to collision safety regulations．


Nonlinear Finite Element Analysis of Sem- i rigid Guardrail under Impact Loading



Jiang De-zeng Huang Xiao-qing Tang Li-qun

2003, 31(3):  64-68. 

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A model of sem- i rigid guardrails under impact loading was built by using LS-DYNA FEM （Finite Element Method） software．The loading-heading’s acceleration-time curves‚velocity-time curves and the guardrail’s total energy absorbing capacity were obtained and compared with experimental mea surements under impact．The results show that FEM is an effective way in the analysis of mechanical behavior of guardrails‚This research provides the base of the further investigation of energy absorption and optimization of structure design of guardrail system under impact loading．


Test-calculated Section Modulus Method of Bulk Cargo in Middle



Yin Shao-qiang Luo Yi Huang Pei-yan

2003, 31(3):  69-71. 

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 The rupture in the middle of bulk cargo is due to the corrosion and fatigue of components in long term usage‚which leads the section modulus to reduce and the general longitudinal strength to weaken．In this paper‚through the research of the rupture of an old bulk cargo in middle‚a new method named “test -calculated section modulus method” was proposed．The method is easy to realize．Comparing with the “zone thickness-survey method”‚the method proposed here proves reasonable．


Architecture & Civil Engineering

Modal Analysis of Large-scale Arch-braced U-shaped Thin-shell Aqueduct Structure



Wu Yi Mo Hai-hong Yang Chun

2003, 31(3):  72-76. 

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 The modal analysis of the arch-braced U-shaped aqueduct structure is carried on by using three dimension finite element method in the conditions of the aqueducts without water‚with3．5m-depth water （adopted for the purpose of research）‚with designed-depth water and with ful- l depth water．The basic dynamic characteristics of aqueducts considering fluid structure interaction‚and the effects of liquid on the aqueduct structure are analysed‚which puts forward suggestions for the seismic design of aqueduct structures．


Axial Bearing Properties of New-type Concrete Filled Steel Tubular Column-slab Joint（Ⅰ）：Introduction of the Experiments and Results Analysis#br#



Liufu Jun, Cai Jian, Zhang Xue-wen, et al

2003, 31(3):  78-80. 

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By means of the axial bearing experiments of15specimens in two groups‚a detail investigation on the axial bearing properties of discontinuous-tube-in-core concrete filled steel tubular column-slab joint is carried on in this paper．The general situation and the main results of the experiments are introduced‚and the factors influencing the axial bearing capacity of the joint are discussed‚which provides basic data for the construction of the formula of the joint’s bearing capacity under axial compression．



Axial Bearing Properties of the New-type Concrete Filled Steel Tubular Column-slab Joint（Ⅱ）： Bearing Capacity Formula and Construction Details



Zhang Xue-wen Cai Jian Liufu Jun Fu Jing-ming Tang Min

2003, 31(3):  81-84. 

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In this paper, the working characteristic of the core of discontinuous-tube-in-core concrete filled steel tubular column-slab joint under axial compression is analysed, the formula for the joint’s bearing capacity under axial compression adapting to engineering application is proposed, which is conservatively used to evaluate the result of the experiments．The construction details of the new-type joint are also discussed for reference in engineering practice．


Chemistry & Chemical Engineering

Study on the Electrochemical Extraction of Oxygen from Air



Fang Li-guo Li Juan-juan Wang Hong-lin

2003, 31(3):  85-88. 

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A new method of electrochemical extraction of oxygen from air was studied in this paper．The extraction system consists of undivided cells with a nickel anode, a carbon-polyterfluoroethylene air-fed cathode and KOH solution as electrolyte．The concentrations of ions in electrolyte were measured by normal analysis method, and the content of oxygen in electrolysis gas was measured by gas chromatography．The experimental results show that the energy consumption to extract 1 kg oxygen is 1. 56～1. 86kW·h．The volume fractiom of oxygen in electrolysis gas is99．8％ above．The cells reaction mainly is that OH^- and HO₂^- ions are electrogenerated at cathode and are also anodically decomposed to release oxygen at anode．


Architecture & Civil Engineering

Thermal Calculation of Glazing Curtain Wall with Thermal Channel



Chen Ha-i hui Deng Xian-he Xiong Jian-ming

2003, 31(3):  89-92. 

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In this paper, the theory of energy conservation of thermal channel is briefed, and the thermal calculating model of glazing curtain wall with thermal channel is concluded．Then the equation parameters of the thermal calculating model are ascertained, and the results of calculation and measurement are introduced too．The temperature on the wall of either outside or inside glazing, the temperature and velocity of air through the thermal channel, and the rate of heat gain in room can be calculated by the calculating model, which may be helpful to correlative engineering calculation．


Chemistry & Chemical Engineering

Preparation and Bactericidal Property of Bactericidal Porous Ceramic



Zhou Jin Zhou Shao-qi Qu Xiao-yue Wu Yan-fen Li Jing Zheng Jian-min

2003, 31(3):  93-96. 

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In this paper, by adding inorganic bactericide and pore-making agent with a proper proportioninto raw ceramic powder, the bactericidal porous ceramic with excellent bactericidal property can be made．The preparation technique and bactericidal property of the porous ceramic are studied．The results of bactericidal tests show that the bactericidal rate of this material is 97. 5％；The bactericidal ability increases with the increasing of bactericide content, the decreasing of the sintering time, and the increasing of porous rate and soaking time．