Journal of South China University of Technology(Natural Science Edition)

Modeling and Controlling of CAD System for Planetary Gear Transmission

Chi Yong-bin Zhou L-i feng

2003, 31(9): 1-6.

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Rational structure and content of CAD system for the planetary gear transmission are discussed from the point of design method．The model of optimum design is introduced．The design objective of minimizing volume and module simultaneously are adoptedand a graded optimum strategy is presented．Different objective functions were used for the first time in accordance with different variables．As a result efficiency of calculation is raisedoptimization of an overall situation and reliability of an optimum solution are ensured．Besidesthe control methods of the program are put forward as a requirement of actual design．

A Novel De-spread Re-spread Smart Antennas with Equalizers

Xie Ze-ming Lai Sheng-li Gi Fei

2003, 31(9): 7-11.

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A novel de-spread re-spread smart antenna with equalizers is proposed．By using a reference signal equalizer and time domain equalizer the antenna array is mainly used to cancel the mult-i user interference while the time domain equalizer is mainly used to cancel the mult-i path interference．The expected user signal for training the antenna array and the equalizers is generated by re-spreading the demodulated expected user data．Simulation results show that the performance of the proposed smart antenna is better than that of the traditional de-spread re-spread smart antennas．

Creative Design Approach to Engineering Problems Through Replacement of Intrinsic Information

Wen Jun Wen Gu-i hua Fan Chong-gui Ding Yue-hua

2003, 31(9): 12-16.

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An integrated creative theory framework is proposed in this paperand then a replacement-based creative approach is introduced based on this theory．The approach employs a hyper-graph rewriting system to organize intrinsic information of the system and to model creativity process．It takes an existing system rather than external requirements as the starting pointand then an innovative structure involving a new system can be obtained by a sequence of formal operations on the initial hyper-graph structure of the system．

Fast Wavelet Image Coding Algorithm Based on Combining Iterations and Significant Subband

Wo Yan Han Guo-qiang Zhang Bo

2003, 31(9): 17-21,25.

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A simplefast and efficient still image compression algorithm based on the embedded zero-tree wavelet （EZW） algorithm is presented to meet the demands of high speed and great efficiency of network transmission．The improved fast algorithm has three distinguishing features：（1） Introducing the conceptions of significant subband and insignificant subbandwhich reduces the repetition scan times of coefficientand quickens the compression speed；（2） Using two thresholds in one coding scanand combining two iterations of the original EZW algorithm into onewhich not only reduces the time complexitybut also improves the compression rate and the power signa-l to-noise ratio；（3） Coding the lowest frequency subband separately from other high frequency subbands．The experimental result shows that the improved algorithm has higher compression rate and faster coding speed than Shapiro’s．

General PLC Automatically Supervising and Controlling System for Sewage Process

Zhu Ning-xi

2003, 31(9): 22-25.

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Programmable logic controller（PLC） automatically supervising and controlling system is designed on the basis of I 2C Bus so that middle and small sewage factories can process sewage by using high performance micro-controllers．The system has advantages of simple configureseasy extending and lower costetc．．Users can program with LADSTLAssemble and C language．

Construction and Realization of Workpiece Material Flow System Scheduling Model Based on Knowledge

Yang Min Ye Bang-yan Mou Li

2003, 31(9): 26-30.

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The part flexible material flow system is modeled with object-oriented PetriNet combined with object-oriented analysis and advice expert system．In additionthe approach of realizing scheduling strategies based on model is also introduced and the corresponding program is developed．In the endthe simulation experiment is given．The result shows that the model is simple in structurethe method of modeling is makes it easy to combine expert system with PetriNet and to realize the function of analysis and advice expert system for material flow system．

Design and Implementation of a Digitized Warehouse Remote Monitoring System

Wu Xin-sheng Yuan Peng

2003, 31(9): 31-34.

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A warehouse remote monitoring system is briefly introduced based on field busand the design me-thod of the hardware ＆software for the system is also described．The system makes the scientifical warehouse operation and management possible by means of thermo-hygrogramguard-against-theft-and-alarm systemclosed-circuit television and central monitoring．The reliability and stability of the system is ensured by its particular design of the dual host computer and power supplyand the intelligentized digital modules．It is very convenient to installationmaintenance and operation as a result of a good structure design of digital measuring instrumentmodularization and touch liquid crystal display-operation interface．The practical running results show that the system is reliable and stableand can meet the requirements concerning the warehouse environment monitor and control systemthe guard-against-theft-andalarm system and the lightning-proof system．

Molecular Magnetometer Based on Faraday Effect of Gaseous NO2

Han Liang-kai Yang Xiao-hua Gong Tian-lin Chen Yang-qin

2003, 31(9): 35-39.

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By means of Faraday spectroscopythe dependence of the Faraday spectral signal of gaseous NO2 on the applied magnetic fieldboth alternating current （by Zeeman modulation） and direct current （by optical intensity modulation）was systemically studied．The Faraday spectral signal is linear to the applied magnetic field based on our experimental result and theoretical analysis．Thusa molecular magnetometer based on Faraday effect of gaseous NO2 which can measure a magnetic field of1×10－3～100mT and DC－1MHz with good linearitywas presented．

Application of Indium Tin Oxide Film to Optical Solar Reflector

Chang Tian-hai

2003, 31(9): 40-43.

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The design principles of indium tin oxide film（ITO） to prevent lectrostatic discharge for optical solar reflector（OSR） are studied．The theory analysis and experiment results show that two design principles are considered when ITO film is used to prevent lectrostatic discharge for OSR．One of them is that surface square resis-tance R□ of ITO film can’t be less than5kΩ·□－1otherwisethe sun spectrum absorptivity of OSR would increaseand surface square resistance R□ of5～106kΩ·□－1 and film thickness d of （150～200）×10－10 m are recommended．The another is that ITO film must be well groundedor else the surface charge and discharge phenomena of OSR would be much more serious．

Application of Variance Analysis to the Examination of Stock Price Periods

Guo Guo-xiong Luan Chang-fu Lu Z-i qiang

2003, 31(9): 44-46.

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All stock price time sequences in Shenzhen and Shanghai Stock Markets are analysed by means of the variance analysis．With the stock period analysis programsome stock price change periods are discovered．The calculation and analysis of a case shows that the variance analysis is effective in seeking stock price periods and it helps to make decisions in stock investment．

Existence of Nontrivial Solution for a Semilinear Elliptic Equation

Yao Yang-xin Wang Jian-xia

2003, 31(9): 47-49.

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A semilinear elliptic equation with singular and subcritical exponent is studied．The existence of nontrivial solution for a semilinear elliptic equation is proved by virtue of the mountain pass lemma and Hardy inequality．

On a Semilinear Biharmonic Equation

Xiong Hui Yang Jun Shen Yao-tian

2003, 31(9): 50-52,81.

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A semilinear biharmonic equation is studied．It is proved that in the space H 2（R N）there exists at least one positive solution in the case of linearyby using the Mountain Pass Theorem and the property of eigenfunction．

Kinetics of Adsorption of Nickel （Ⅱ） Ion on Fibre Containing Amidoxime Groups

Tao Ting-xian Wu Zh-i chuan Sun Zh-i juan

2003, 31(9): 53-56.

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The adsorption of Ni 2＋ on the fibre containing amidoxime groups in different initial concentration Ni 2＋ aqueous solution is studiedand it was found that the bonding between Ni 2＋ and amidoxime groups was in accordance with the Freundlich isotherm．The reaction order was determined by infinitesimal calculusbased on the relationship between the adsorption time and the concentration of Ni 2＋．To determine reaction rate constants（ k）the adsorption of Ni 2＋ of 0．033mol·L －1（initial concentration） on fibre containing amidoxime groups was also studied at different temperature．According to the correlation of k with the temperature and Arrhenius equationthe activation energy was obtained．The results indicate that the adsorption kinetics accorded with the character of the first order reaction： with the reaction rate equation being c＝c0e －ktthe equation of reaction rate constant k＝0．1716e －Ea／RTand the activation energy Ea＝13．52kJ／mol．

Structure and Performance of Steam-cured Fly-ash Aerated Concrete with Light Weight Aggregate

Wu Xiao-mei Fan Yue-ming

2003, 31(9): 57-61.

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The structure and performance of steam-cured fly-ash aerated concrete with light weight aggregate prepared by adding light weight aggregateair-entraining agent and gas-forming agentfinely ground aggregate were studied by SEM and other testing methods．The results show that the pore structure was improved．The aperture was less than0． 6mmand most of the pore size distributed in the range of0．2～0．5mm．When the densityvolume mixed ratio and strength of light weight aggregate and paste matched with each otherlight weight aggregate could disperse evenly in the sample and formed an intense boundary surface with the paste．As the volume fraction of light weight aggregate increased from 30％ to 45％the dry shrinkage decreased significantlyand the coefficient of carbonization lowed down．Performance such as compressive strengthdry-shrin-kage and carbonization-resistance of the sample cured at 95℃ for one day could meet the requirements of standard GB／T11968—1997which is the standard of autoclaved aerated concrete．

Structure and Properties of Carbon Fibre-Reinforced TLCP Composites

Ning Ping Hu Jian Yi Lan Xia Lin

2003, 31(9): 62-65.

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The preparation of carbon fibre-reinforced thermotropic liquid crystallic polymer（TLCP） composites has been reported．Influence of fibre contentfibre style on the mechanical properties and microstructure of the composites are discussed．The experiments show that the tensile strength of CF（continuous fibre）／TLCP composites reached385 MPathe flexural strength was about242MPathe impact strength got to29912J·m －2the Brinell hardness went as high as20and the heat distortion temperature was more than203℃．The results demonstrate that the machanical properties of the composites are influenced by fibres styleand the machanical properties of CF（continuous fibre）／TLCP composites are higher than that of CF（chopped fibre）／TLCP compo-sites．The SEM photographs show that TLCP molecules orientated along the direction of fibre and formed micro fibre structure during the fabricationand the properties of the composites increased obviously．

Determination of the Antibiotic Susceptibilities of Four Marine Pathogenic Vibrios

Zhang Xin Cai Jun-peng

2003, 31(9): 66-69.

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Antibiotic susceptibilities of four marine pathogenic Vibrios were investigated．The results demonstrate that Vibrio anguillarum was highly sensitive to chloramphenicol and genamicinbut resistant to other stu-died antibiotics． Vibrio parahaemolyticus showed resistance to tetracyclinekanamycin and penicillinbut was sensitive to chloramphenicolcephalothingenamicinErythromycinand streptomycin．Vibrio fluvialis showed resistance to tetracycline and streptomycinbut was sensitive to chloramphenicolkanamycincephalothingenamicinpenicillinand Erythromycin．Vibrio alginolyticus showed resistance only to tetracyclinebut was sensitive to other7antibiotics tested in this study．The minimum-bacteriostat mass concentrations of several antibiotics to which these four Vibrios displayed resistances were determined．

Determination of the Antibiotic Susceptibilities of Four Marine Pathogenic Vibrios

Wang Q-i jun Zhang Shu-i hua Sung Chang-keun Xu Bao-jun Li Chang-tian Baek Seoung-young

2003, 31(9): 70-75.

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A novel and sensitive thin-layer chromatography（TLC） method for specific and simultaneous detection of both lactone form Monacolin K and acid form Monacolin K is developed in this study．The TLC works in the following conditions： The TLC plate was Silica Gel60RP－18F2540．5mmchemically modified layerMerck Germany；The solvent system was chloroform∶methanol ∶ammonium hydroxide＝25∶3∶1（volume ratio）；Monitoring the TLC under365nm after heating it with a slight coating of the charring reagent 30％（volume fraction） H2SO4ethanol on the TLC plateallowed the specific detection of Monacolin K and the low detection limit was first time brought down to30ng．The present TLC method is suitable for the routine qualitative and sem-i quantitative analysis of the bulk materials containing Monacolin K．

Preparation of Antibody Cross-linked Liposome

Lin Qiao-hui Miao Long Pan Li Luo L-i xin Zheng Su-i ping Zhong Wei

2003, 31(9): 76-81.

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The dye-encapsulating liposome which is prepared by ultrasonic wave can be used in immunodiagnostic application after cross-linked with ant-i HbsAg antibodies．The results show that the dye-encapsulating liposomes prepared by ultrasonic wave method are circular and stable．The ratio of encapsulated-dye is0．61％．And the activity of the ant-i HbsAg antibody cross-linked liposomes in which glutaraldehyde was as crosslinker has been detected by ELISA methlod．

Dynamic Internal Force Analysis of Large U-shaped Beam Aqueduct Structure

Mo Ha-i hong Zhang Hua-zhong Liu Chun-yang Wu Yi

2003, 31(9): 82-85,89.

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Time history response analysis finite element method and modal analysis finite element method are used to analyze large U-shaped beam aqueducts with different lengths in this paper．The earthquake responses of middle long shells and long shells with earthquake waves from transverse direction and vertical direction are studied and the regulations of the additive dynamic internal force were found．In the static analysisthe internal force result by finite element method is just one third of the result by the tratitional method．In the dynamic analysisthe transverse additional dynamic bending moment generated by the transverse earthquake is more than50％ of the static result by finite element method．That means when the dynamic loads are consideredthe internal force result by the traditional method is safe and the safety factor is at least two．

Stochastic Analysis of Axially-loaded Bars by Singular Points Outside Domain Method

Su Cheng Fan Xue-ming Yan Quan-sheng

2003, 31(9): 86-89.

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The stochastic analysis of axially-loaded bars by singular points outside domain method is presentedin which the uncertainty of Young’s modulus is taken into consideration．Analytical solutions corresponding to different covariance structures and fluctuation scales are obtained．Based on thisthe effects on the stochastic results of covariance structuresfluctuation scales and mid-point discretization of random field are given．

ALE Simulation of Large Sloshing of Water in U-shaped Aqueduct

Wu Yi Mo Ha-i hong Yang Chun

2003, 31(9): 90-93.

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Arbitrary Lagrangian-Eulerian method is used to study large sloshing of water in large scale U-shaped aqueductand to discuss the vibration responses of aqueduct structure with different water levels under sinusoidal loads and earthquake action．Analysis of the data indicates that nonlinear behaviors arise from the sloshing of free surfaceand become stronger with increase of the water level．Meanwhileunder a certain water levelthe sloshing will increase suddenly．

Kinematic Analysis and Optimization of the McPherson Independent Suspension

Liu Chen-ya Liu Shu-yan Yin Wen-jie

2003, 31(9): 94-98.

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The kinematics of McPherson independent suspension is analysed based on the method of spatial mec-hanism kinematics and numerical calculation．Meanwhilethe parameters of the guiding mechanism and the splitting point of the steering linkage are optimized．The results indicate that the algorithm makes the suspension design more concise and clearand the parameters of optimization improve the suspension kinematics characteristics．

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