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

Algorithm Research of the Inverse Matrix in the Solution of the Inverter Harmonic Elimination Model

Huang Y u-qing Xie Y un-xiang

2003, 31(11): 1-4.

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Various matrix inversing methods and their algorithm stability are analysed．It is found that the convergence of mathematic solution of selective harmonic elimination equation results from morbid-condition of the selective harmonic elimination matrix．The inversing method with Gauss-Jordan elementary transformation based on the compact memory is presented and calculation steps are described in detail． The results show that the algorithm has many meritssuch as little memory occupyinglittle calculation easy suited to parallel calculation and so on．Thereforeit is an effective method to get inverse matrix．

Application of Ultrafiltration Membrane System in Refined Cane Sugar Process

Fu Xiong Y u Shu-juan Chung Ch-i chou

2003, 31(11): 5-9.

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Reported here is a new sugar processing method （membrane process） providing an energy efficient and environmentally friendly process for the production of refined cane sugar．The UF （Ultra Filtration） membranes used in cane sugar process can remove color with minimal effect on environmental quality．The color removal ranges from48．7％ for raw sugar to58．2％ for affination syrup．The treatment of affination syrup using the membrane process removes impurities which affects the rate of crystallizationand improves the crystal growth rate by up to48．9％38．2％ and37．0％ respectively for the first hourthe second hour and the third hour．The subsequent increase in crystal growth rate will increase the plant capacityreduce sucrose lossand increase yield．The result shows the reduction in viscosity by17％ due to the ultra filtration treatment．Application of the membrane process in raw sugar mills in conjunction with a sugar refinery can eliminate one or more of the various refining processessuch as affinationcarbonationphosphatationand／ or granular carbon／bone char／ion exchange for decolorization．In summarythe membrane process can produce high quality food grade sugar products meeting customers’needs with a considerable reduction of both capital and operating costs．

A Method for Determining Fuzzy PD Self-turning Output Varible Control System六s Field

Liu Xiao-ming Bao Min-zhong Liu Y-i jian

2003, 31(11): 10-13.

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A Gauss curve is used to determine a fuzzy self-turning PD autopilot output parameters’field． Based on the corresponding PID controllertwo of the three parameters were fixedand then the other parameter was regulated．When a series of data was inputthe system output a curve stainsome of whose attributes were like gauss curve．Thereforethe Gauss curve was applied to determine both fields of P and D．Some simulation tests prove this method is effective．

State Space Analysis of Chemical Processes System

Qian Y u Y ao Zh-i xiang Li Xiu-xi

2003, 31(11): 14-19.

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The dimension criterion of state space is proposed from the first principles of chemical process．Independent component analysis is believed as a method which analysis process state space and gain state variables．Some factors for state space determination are also discussed．In a simulation casethe state space dimension and the state variables have been determined on the criterion．The multivariate statistics analysis consistent to the criterion determination；the state independent component direct-viewing and effectively describe the process system and independent component analysis is proved as an effective state space analysis method．

Aperture Structure of the Chitosan Ultrafiltration Membrane

2003, 31(11): 20-23+29.

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An Optimized Distributed Query Algorithm for Virtural Database System

2003, 31(11): 24-29.

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Effects of Ultrasonification on Protein Extraction of Defatted Soy Flakes and Functionality of SPI

Y ang Xiao-quan, Xiong Jian, Chen Zhong, et al

2003, 31(11): 30-32,36.

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The ultrasonic extraction of soy protein from defatted soy flakes and the effects of ultrasonic treatment on the functionality of soy protein isolates （SPI） were studied．The results show that the ultrasonic treatment could obviously increase the extraction of protein from different denatured defatted soy flakes．The protein extraction of defatted soy flakes and white flakes with ultrasonic treatment at300● W and12●kHz for8●min were73．43％ and90．28％ respectivelybut only49．58％ and66．54％ with conventional stirring extraction at 45 ℃ for 1 h．SDS-PAGE and GPC analyses show that ultrasonic treatment mainly affects the 7S components of soy protein．The ultrasonic treatment can also improve the functionality of soy protein isolates （SPI） obviously．The emulsifying property of SPI increased while the viscosity decreased with ultrasonic treatment．

Stiffness Performance of Truss-String Structure of Guangzhou International Convention and Exhibition Center

Sun Wen-bo Y ang Shu-yong Chen Rong-yi

2003, 31(11): 33-36.

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The application of pipe-truss string structure in Guangzhou international covention and exhibition center was introducedand the change of mechanical properties of cold or heat-bent steel pipes was studied．A series of experiments for bent steel pipes and their mechanical properties were conducted． Through the testing results of36sets of specimensa fitting formula was presentedby which was applied to investigate the vertical stiffness of this kind of structure．The calculated value of the suggested method is in agreement with the results of experimentswhich indicates the stiffness degradation of cold-bent steel pipes．As a resultthe overall stiffness of this kind of structure is also degraded．

A New Test Method for Aggregate Alkali Activity

Y in Qi Wen Z-i yun

2003, 31(11): 37-40.

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The application of a new test method for aggregate alkali activityso-l gel expansion method was presentedwhich was used to investigate the alkali activities of opal and natural aggregate．The experimental results show that by using the methodopal shows significant alkali activityand at the pessimum proportion of opalboth SiO2 content and SiO2／Na2O mole ratio in the reaction solution reach their maximum valuesand so is the expansion．

Superabsorbent Polymer as Self-curing Admixture in Cement-based Materials

Y e Hua Zhao Jian-qing Zhang Y u

2003, 31(11): 41-44.

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Superabsorbent polymers（SAP） were prepared and used as a novel self-curing admixture in cement-based materials．SAP has good capability of absorbing and retaining water．It can restrain the desiccation in the early age of the cement hydrationand can offer sufficient moisture to keep the internal relative humidity in system in a rather long period of time．So the reaction of hydration is improved and the self-curing process thus realized．The effects of SAP on the fluiditysetting timestrength properties of cement-based materials and also on the hydration reaction by measuring the chemical bonding water amount were discussed．It is observed that the addition of SAP can improve both the hydration degree of cement paste and the mechanical properties of mortar．The bending strengths in particularare all improved by10％～20％ in3 days7days and28days

Stress Concentration of Fiber-bundles and Bundle-reinforced Composites at Low Temperature

2003, 31(11): 45-48,52.

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Nonlinear Model and Its Dynamic Equations for4WS Vehicles

Y ao Y ong-jian Han Qiang

2003, 31(11): 49-52.

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A practical nonlinear model and its dynamic equations for 4WS vehicles are established．The model can reflects the effects of main factors in practical structures on the vehicle motion．The nonlinear model presented here is proved be a feasible4WS vehicle model for emergency maneuvers （greater lateral accelerationspossibly combined with longitudinal acceleration or braking）and is of greater precision and can be instructive to engineering practice．

Long Monitoring and Analysis on the Strain of Prestressed Twist Steel Cables Inside a Bridge

Lao Xiao-chun, Tang L-i qun, Ren Peng, et al

2003, 31(11): 53-56.

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The method of monitoring the strain of prestressed twist steel cables under construction by means of embedded optical fiber Bragg grating sensor （FBGS） was studiedand the influence of temperaturetransverse strain and other factors on the effectiveness of measurement results were analyzed．The mechanics behavior of the prestressed twist steel cables in the complicated constructing environment was probed．It shows that if the temperature changes greatlythe measurement results should be compensated．And applied the non-uniform transverse strainsFBGS does not meet the Bragg rules and further study should be made．The test results show that the FBGS has the advantages of easy embedmentstrong resistance to magnetism and absolute measurement of the straintherefore it is a good sensor for long monitoring of the structural health inside structures．

Integrated Design of Guangzhou Urban Bridge Management Information System

Fu Xin-sha Li Xin-ping Jia De-liang

2003, 31(11): 57-60.

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According to the current operation situation and managerial demand of the metropolis bridge in Guang-zhoufirstan overall train of thought for the study and development of the metropolis bridge management information system in Guangzhou is advancedbased on Internet and GIS platform．Then a systematic demand analysis and the function design of every subsystem are recommended．And the main function module is introducedincluding setting-up of the bridge databasethe evaluation and the order of the technological state of the bridgebridge maintenance cost analysisand bridge security appraisal bridge bearing capacity evaluationbridge state predictionbridge maintain decisionetc．

Development and Application of Transportation Database System for the Bus Station of Guangdong Province

Wen Hu-i ying Zou Xian-min X u Jian-min

2003, 31(11): 61-64.

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By analysing the actualities and the sequent of the information construction for Guangdong bus station the strategymethod and system function of developing the database system for the bus station were introduced． The method dealing with data synchronization was expatiated．By using the replication technology of SQL Server7．0replication tag of original database was sent to the aim databasethus ensuring the efficiency and synchronization of the database．For the characteristic of databasethe database system has the function of network communication and inter-geographic information．A platform of transportation which includes the function of databaseremote communication and geographic information was developed by utilizting the developing tool of Map X．The design and application of this system will definitely popularize and improve the management level and marketing service capacity of the bus station．

Monte-Carlo Simulation of Neutral Beam Ions in a Tokamak

Y ao Ruo-he Zhang Xiao-dong

2003, 31(11): 65-68.

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The transport process of neutral beam ions in HT-7Tokamak was simulated by Monte-Carlo method．The neutra-l plasma collision processes taken into accountwhich include the charge-exchange electron impact ionizationion impact ionizationetc．The density distribution of neutral beam ions has been obtained．The simu-lated results show that neutral particles penetrate deeper with higher injection energy of neutral particlesand the neutral atom density in Tokamak increases with the increase of injection flux of neutral particles．The density distribution of neutral atom is almost in agreement with the theoretical estimation at the plasma edge．

Biochemical Characteristic Difference of Zona Pellucida Glycoproteins Between Oocytes and Embryos

Cao Zuo-wu

2003, 31(11): 69-72.

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To investigate the biochemical characteristic differences of zona pellucida glycoproteins between oocytes and embryos are investigated through comparison betweenthe zona pellucida components of unfertilized oocytes and that of 2-cell embryos were analyzed by SDS-PAGEand the analysis of the differences of O-linked sugars chains between unfertilized oocytes and2-cell embryos zona pellucida was carried out by HPLC．The results show that the samples of unfertilized oocytes and2-cell embryos have similar SDS-PAGE profilesbut an additional band with the molecular mass between15000～30000was separated from the reduced sample of 2-cell embryos by SDS-PAGE．HPLC charts show that the sample of unfertilized oocytes had three O-linked monosaccharides with similar retained time values to those of 2-cell embryoswhile the O-linked oligosaccharides of the two samples were evidently different．It is concluded that the inactivation of sperm receptor of zona pellucida lies molecularly in the modification of its O-linked oligosaccharidesbut not in the change of O-linked monasaccharides．

Isoelectric Point Determination and Structure Modeling of a Single-chain Fv Against HBsAg

Xiong Sheng, Wang Y-i fei, Qian Chu-i wen, et al

2003, 31(11): 73-76.

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To identify the3D structure and physical and chemical character of a single-chain Fv against HBsAg （HBscFv）methods of experimental biology and computational biology were applied．FirstAntheprota comprehensive software to analyze proteinwas used to predict the isoelectric point （pI） of HBscFv．Secondthe predicted result was confirmed by IEF．Thirdneural network systems （PHDsec） and SWISS-MODEL were applied to predict the secondary and tertiary structure of HBscFvrespectively．It was found that the theoretical pI of HBscFv is8．51and the experimental pI is from7．3to8．1． PHDsec indicated that HBscFv is a whole β-globin．The predicted tertiary structure displayed that the VH domain of HBscFv was made up of9β-sheets and VL domain of8β-sheets．Due to the specific characteristics of single-chain FvSWISS-MODEL software for homo-logy modeling of tertiary structure cannot predict the quaternary structure resulting from the interaction of VH and VL domains．

Microstructure and Chemical Component Analysis of Hypnea

Xu Jian-xiang, Zhao Mou-ming, Lin We-i feng, et al

2003, 31(11): 77-80,84.

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The microstructure and chemical component of Hypnea were studied．The result shows as follows： the Hypnea thallus is made of cortex cell and marrow celland its cell wall is consisted of middle lamellaprimary cell wall and second cell wall．As cells linkage materialcarrageenan polysaccharides locates in middle lamella between the primary cell walls with a amorphous status．The main component of Hypnea is carbohydrates．The content of carbohydrates in Hypnea from Yangjiang and Hainan is5％ lower than that in Encheuma；but the cellulose content in Hypnea from Yangjiang is the highest and that in Encheuma is the lowest．

Problems of Detection and Its Identity

Liang Man-fa Luan Chang-fu

2003, 31(11): 81-84.

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A stochastic model of detective problem was built and was transformed into the problems of finding the distributions and the numerical characters of inquiry number and the problems of finding the limit distributions of the Markov chain．As to the cases in which the criminal makes a confession of his crimethe probability distribution of inquiry number for cracking a criminal case was calculated and the formula to calculate the mean time and the variance of inquiry number was givenfrom which a new identity resulted．As to the cases in which the criminal denies his crimethe one-step transform probability matrix in Markov chain and the final distribution of inquiry number for cracking a criminal case were obtained．The same results were obtained by the methods of characteristic functions．

On a Class of Linear Functional Equations for Functions of Several Variables （Ⅰ）

Huang Xin-yao

2003, 31(11): 85-87.

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By letting the function f（x1x2…xn）have continuous partial derivatives of second order with respect to xnthe functional equation ∑ n i＝1 （－1） i－1［ f （ x1…xi ＋ xi＋1…x n＋1）＋ f （ x1…xi － xi＋1…x n＋1）］＋（－1） n2f （ x1x2… x n）＝0is considered．Firstthe general solution of the equation ∑ n i＝1 （－1） i－1［ F（ x1…xi ＋ xi＋1…x n＋1）＋ F（ x1…xi － xi＋1…x n＋1）］＝0 was presented．Thenthe first functional equation was twice differentiated with respect to xn＋1 and reduced to an equation of the aforementioned type．It is found that the general solution of the first functional equation is f （ x1x2…x n）＝ ∑ n－1 i＝1 （－1） i－1［ A（ x1…xi ＋ xi＋1…x n）＋ A （ x1…xi － xi＋1…x n）］＋（－1） n－12A （ x1x2…x n－1）． Where A（x1x2… xn－1）is an arbitrary twice continuous differentiable with respect to xn－1．

Natural Boundary Conditions of4-point Theory for Surface Design

Liang Jing-hong, Wu Guang-chao, Qiu Dong-tao, et al

2003, 31(11): 88-91.

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A solution to the boundary conditions of4-point interpolatory subdivision scheme in the application to curve and surface modeling was studied．Combineing with4-point schemethe traditional nonlinear method for natural boundary conditions in geometric modeling is improved．Based on the fact that vertexes of an isosceles trapezoid are concyclica linear method is brought forward for natura-l boundary-point by getting axisymmetric point．Hence the key problem concerning the application of 4-point theory to surface modeling is well resolved

Preparation and Photocatalysis Characterization of TiO2by Microwave Radiation So-l Gel Method

Xia Qi-bin, Li Zhong, Xi Hong-xia, et al

2003, 31(11): 92-96.

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Titanium dioxide（TiO2） photocatalysts have been deposited on quartz sands by microwave radiation So-l Gel method．The influencing factors on sol quality including different heating-up method microwave power and microwave reaction temperature have been investigated．The particle size in the sol prepared by microwave radiation is smaller than the one by normal heating-up method．The appropriate microwave reaction conditions are the microwave power of 600W and90℃．Phenol is regarded as the photodegradation reactant and the photocatalysed performances of two photocatalysts prepared by two different methods have been investigated ．The results indicate that the photocatalysed performance of TiO2 photocatalysts prepared by microwave radiation So-l Gel method is better than the one prepared by conventional So-l Gel method．

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