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Table of Content

    20 March 2004, Volume 32 Issue 3
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    A Solid Oxide Fuel Cell with H2S as the Fuel
    Chen Jian-jun, Zhong Li, Wei Guo-lin, et al
    2004, 32(3):  1-4. 
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    The electrochemical performance of a solid oxide fuel cell with the configuration of H 2 S‚（MoS 2 ＋NiS＋Ag）／YSZ／Pt and air was examined at an atmospheric pressure and 750～850℃．It is found that the increasing of temperature helps to enhance the ionic conductivity of electrolyte and makes the cell performance better．When the H 2 S stream flows into the anode and air stream into the cathode‚the maximum electric current density and the maximum power density go respectively up to 800mA／cm 2 and84mW／cm 2 at750℃‚while those at850℃ respectively to1750mA／cm 2 and200mW／cm 2.
    Preparation and Property of a Novel Al3+-doped Silica Gel Adsorptive Material
    Fang Yu-tang, Ding Jing, Fan Juan, et al
    2004, 32(3):  5-9,19. 
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    A novel Al 3+ _doped silica gel adsorptive material with excellent adsorption property was pre-pared by treating ceramic fiber matrix with the aqueous solution of sodium silicate (Na 2 SiO 3 )and alu-minum salt etc ., as well as with pH value adjustment .The effects of impregnation conditions on the ad-sorptive property and surface structure of the novel material were investigated , thus obtaining the opti-mal reaction condition, that is, 26.7%(mass fraction)of Na 2 SiO 3 , 10%(mass fraction)of aluminum salt , impregnation time period of 120min , reaction temperature of 60 ℃and the pH value of the solution of 1.8.It is found that Al 3+ _doped silica gel can perfectly deposit on the surface and in the apertures of ceramic fiber , and its mesopores play a key role in adsorption.For the substitution insertion of alu-minum into the silica gel framework (Al 3+ doped), the adsorption property , heat resistance property and mechanical strength of the novel material are superior to those of silica gel .
    Removing of Moisture Load in Cooling Ceiling Air-conditioning System by Rotary Dehumidifier
    Ding Yun-fei, Ding Jing, Wang Zhuo-yue, et al
    2004, 32(3):  10-14. 
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    The demands and schemes for the moisture load disposal in cooling ceiling air-conditioning sys-tems by using fresh air were investigated‚reaching the conclusion that adsorption dehumidification is better than cooling dehumidification．Experimental results of the moisture load removing by rotary de-humidifier and the feasibility of implementation schemes show that‚in summer‚the rotary dehumidifier can satisfy the system demands when the outdoor air temperature and humidity are respectively lower than30℃ and80％ besides office buildings‚and that‚in the high-temperature and high-humidity areas‚the rotary dehumidifier can satisfy the demand for indoor humidity and the demand for low humidity by the head surface cooler preprocessing of the fresh air．Moreover‚the indoor relative humidity can be controlled by regulating the regeneration temperature and the fresh air flowrate of rotary dehumidifier．
    Polymerization Stability of St-BA-HEMA-AA Copolymeric Latex Containing Functional Monomers
    Zhang Xin-ya Lan Ren-hua Chen Huan-qin
    2004, 32(3):  15-19. 
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    The quaternary copolymeric latex of styrene-butyl acrylate containing functional monomers‚ such as hydroxyethyl methacrylate and acrylic acid‚was prepared by the emulsion polymerization process with potassium sulfate as the initiator．The effects of emulsifier system‚initiator system‚functional monomer dosage‚polymerization process and polymerization temperature etc．on the stability of emulsion polymerization were systemically investigated．It is found that the decrease in polymerization temperature‚the increase in emulsifier dosage and the adoption of sem- i continuous emulsion polymerization process are beneficial to improving the stability of emulsion polymerization．
    Thermodynamic Properties of P2O5-SiO2-Na2O-Al2O3 Glass System
    Yin Bing, Deng Zai-de, Yang Gang-feng, et al
    2004, 32(3):  20-22,28. 
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    The thermodynamic properties of P 2 O 5 -SiO 2 -Na 2 O-Al 2 O 3 glass system were investigated by means of differential scanning calorimetry and thermo-mechanical analysis．The characteristic tempera-ture and the thermal expansion coefficient of the system with different SiO 2 contents were then dis-cussed．The results indicate that‚with the increase in SiO 2 content‚the transition temperature （T g ） and soft temperature （T f ） of the glass increase accordingly‚while the thermal expansion coefficient decreases．
    Flow of Polymer Melt in the Single Screw Extruder under the Action of Vibration
    Xu Bai-ping Qu Jin-ping
    2004, 32(3):  23-28. 
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    A new finite difference method with numerical simulation to solve the two-dimension coupled flow field was proposed without solving the pressure Poisson equation．The flow field of polymer melt in the single screw extruder channel under the action of vibration force field was numerically calculated‚thus obtaining the velocity and the shear stress distributions of the polymer melt in the channel at diffe-rent times．The results show that the vibration will result in a periodic variation of the velocity and shear stress in the channel‚even an instantaneous pressure backflow in the extruding direction of the channel if the disturbance coefficient of the melt is even larger．The correctness of the results mentioned above was finally proved by the curve of the shear stress distribution．
    Effect of Zn Doping on the Photocatalytic Activity of Nano-sized TiO2
    Yuan Wen-hui Bi Huai-qing Wei Chao-hai
    2004, 32(3):  29-32,36. 
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    Nano-sized photocatalyst particles of TiO 2 and Zn-doped TiO 2 were prepared by the so- l gel method．The FTIR results of the particles show that the infrared absorption peaks split further with the increase of calcination temperature．TGA results reveal that the surface hydrophilicity of the sample in-creases with Zn doping．XRD results and the calculation results by Scherrer equation indicate that the particle size of TiO 2 increases sharply with calcination temperature．These results are similar to those ob-ained by SEM and BET．Experimental results of the photocatalytic degradation of methylene blue show that the photocatalytic activity of Zn-doped TiO 2 calcined at530℃ is highest with the Zn doping content of2％（mass fraction）．
    DNA Vaccine Immune Mediated by Gene Gun
    Han Shuang-yan, Li Jie-sheng, Guo Yong, et al
    2004, 32(3):  33-36. 
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    The DNA vaccine mediated by gene gun was used to vaccinate the abdomen of mice‚and im-muno-histological examination was applied to the expression of gD antigen at inoculation sites．The in-duced IgG antibody was assayed with ELISA and the protective effect of DNA vaccine on animals was investigated．The results show that‚by the mediation of gene gun‚DNA vaccine plasmid can be successfully delivered to the cutis of mice‚that the antigen protection gene gD2glycoprotein can effectively ex-press in the cutis and muscle of mice‚and that high titer neutralizing antibody were induced in immu-nized mice‚which will protect the mice against HSV 2virus．
    Effect of Plasticizer on the Performance of Zein Film
    Huang Guo-ping Yang Xiao-quan Wen Qi-biao
    2004, 32(3):  37-40. 
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    To improve the mechanical property‚flexibility and water-proof ability of zein film as a kind of biodegradable material‚the effects of different plasticizers‚such as oleic acid‚stearic acid and polyethylene glycol400‚on the performance of zein film were investigated．The results of the texture analysis‚surface-structure observation and thermodynamic analysis of all kinds of modified plasticization zein films indicate that‚adding3％（volume fraction） of oleic acid‚the tensile strength as well as the elongation rate of zein film is respectively raised by30％ and by20times‚water absorption is reduced by 2times‚flexibility is greatly improved‚and that the surface structure of the film is even glossier．

    Determination and Evaluation of the Nutritive Composition in the Seed Kernel of White Pitaya
    Pan Yan-li Rui Han-ming Lin Chao-peng
    2004, 32(3):  41-43. 
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    The nutrition composition in the seed kernel of white pitaya was analyzed．The results show the following contents：32．02％ （mass fraction‚the same below） of fat‚22．06％ of protein‚21．03％ of starch‚10．35％ of rough fiber‚5．80％ of moisture‚3．18％ of ash and1．75％ of total sugar．The amino acid and fatty acid compositions of the protein in the seed kernel were also analyzed‚showing80．83％ of unsaturated fatty acid content in fatty acid‚and in unsaturated fatty acid‚54．43％ of linoleic acid con-tent———the highest of all．
    An Optimized Fuzzy Control Approach to the Trajectory Tracking of Nonholonomic Mobile Robots
    Wu Xin-sheng Ren Hua-ying
    2004, 32(3):  44-49. 
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    Aiming at the high nonlinearity and uncertainty of the dynamics of nonholonomic mobile robots‚as well as the fact that the robot can not be asymptotically stabilized by the continuous state feedback method‚an optimized fuzzy control approach to the trajectory tracking of the robots was proposed on the basis of genetic algorithm．The fuzzy rules of the approach were optimized by genetic algorithm‚and the structure as well as the parameters of the fuzzy logic controller was effectively determined‚thus achieving desired tracking performance．The numerical simulation results indicate the efficiency of the proposed approach．

    A Modified Evolving Recurrent Neural Network System
    Lu Ting, Ge Hong, Mao Zong-yuan, et al
    2004, 32(3):  50-55,65. 
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    Some improvements were presented for a basic evolving recurrent neural network system．Firstly‚a switchable fitness evaluating function was proposed to maintain the sensitivity of fitness function in training er-ror‚and ensure the exact and effective duplication of fine individuals by selecting operation．Next‚aiming at the slight mutation intensity of uniform mutation on individuals‚a concentrative mutation method with variable neighborhood length was introduced to improve the system abilities to keep population diversity and to find fine individuals．Then‚based on the relationship between the fitness of individual and the mean fitness of population‚an adaptive adjustment strategy of mutation step size was proposed．Finally‚by applying the Hamming distance among individuals‚the elitist keeping strategy was also improved to stop the fittest individual from reduplicating itself in population．Simulation results show that the evolving recurrent neural network system with all these improvements is of more excellent performance．
    Wheel-advanced Method for Curved Surface Uniform Mesh Generation
    Huang Xiao-dong Du Qun-gui Ye Bang-yan
    2004, 32(3):  56-60. 
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     A new method for curved surface finite element mesh generation was put forward‚in which the surface boundary is discretized and the adjacent nodes are linked to construct a segment list．By the segments in the list and according to its space position‚a circle is constructed‚which is used to position nodes on the curved surface‚thus generating new mesh nodes and a new element．So the node‚element and segment are alternately generated．By this method‚the curved surface uniform meshes with high quality can automatically be generated．This method is suited to various curved surfaces．It is also com-mon to solving the key problem of automatic curved surface mesh generation in finite element modeling．
    Self-organizing Fuzzy Active Vibration Control of Flexible Structures
    Chen Zhan-rong Xu Juan Yu Zhi-tao
    2004, 32(3):  61-65. 
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    提出一种在线自组织模糊逻辑控制器的设计．该设计应用于含压电驱动器柔性结构的振动控制中‚不需建模‚可用输入／输出历史数据生成模糊规则．将生成的规则存储在模糊规则库中‚通过自组织过程进行在线更新．同时对悬臂梁分别在瞬态和正弦激振下的模糊主动控制进行了仿真实验．结果表明‚该控制器对上述两种激励的振动比传统模糊控制器有更明显的抑制作用．
    Stock Analysis Method of Manufacturing Industry Based on ERP System
    Liu Yong Zeng Min-gang Tang Dong-ping
    2004, 32(3):  66-69. 
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    Analyzed in this paper are the turnover and possession rates of stock fund‚which are presently used to judge the stock and turnover situation of the spare parts and materials in manufacturing industry． The disadvantages of traditional methods were pointed out and the goods flowing graph tool of logistics management was also presented．By studying the input／output accumulation curves and calculating the related data‚the average stock fund of goods and the turnover rate of stock fund in any period can be exactly obtained‚and the dynamic information of stock fund turnover can be well reflected‚which will practically contribute to make the manufacturing industry be informationized‚and the spare parts and materials management be rationalized and standardized．
    Establishment of the Comprehensive Evaluation System of Cold Stamping Die Quality
    Lu Xiao-chun Guo Sheng Ruan Feng
    2004, 32(3):  70-73,79. 
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    Presented in this paper are a comprehensive evaluation system of die quality‚a multiplayer hierarchical amendment index system according to the characteristics of cold stamping die production‚an evaluation standard referring to the technique and design rules of dies‚an scientific evaluation by using the multiplayer hierarchical and the fuzzy comprehensive evaluation method．The applications show that the system can be used to evaluate the die quality objectively‚fairly and reasonably．
    Lippmann-Schwinger Method to Solve the One-dimension Scattering Problem
    Wang Qin-hui
    2004, 32(3):  77-79. 
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    Molecular Model Design and Quantum Chemistry Calculation of Cluster N8
    Lu Gui-ning Zhang De-cong Tao Xue-qin
    2004, 32(3):  80-82. 
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    The existence of cluster N 8 was predicted according to the existence of N 5＋and N 3－ ．TwentyN 8 isomers were then designed by using the molecular simulation software．The full geometry optimiza-tion‚thermodynamics calculation and harmonic vibration frequency analysis of these twenty N 8molecules were performed at the HF／STO-3G level with the ab initio method of quantum chemistry．The synthesis routes of N 8 in experiments were finally discussed．The calculated results show that twelve of the twenty N 8 isomers can stably exit‚and that the planar double five-member ring form of N 8 with D 2h symmetry is the most stable．Energy analysis result indicates that a N 8 molecule with a stable structurecontains much higher energy than four N 2 molecules‚which means N 8 is a potential green material with high energy density．
    Compactibility of Ionic Soil Stabilizer Strengthening Soil
    Zhang Li-juan, Wang Yi-min, Chen Ye-kai, et al
    2004, 32(3):  83-87. 
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     Ionic soil stabilizer （ISS）‚lime and cement were used to reinforce the silty sand in Jishan‚Guangzhou．The compactibility variation and the strength variation of ISS strengthening soil were analyzed by the results of compaction test and unconfined compressive strength test with different proportions and enclosing material time periods．The analytical results indicate that the maximum dry density of ISS strengthening soil increases with the enclosing material time periods‚which causes the improvement of bearing capacity‚while the effect of the water content of strengthening soil on dry density varies with soil consolidation agent．The relation between the maximum dry density and the enclosing material time period‚as well as that between the strength and the compaction degree of the strengthening soil was finally established．

    Experimental Research on Secondary Shear_resistant RC Beams Reinforced with AFRP
    Zhao Chen, Huang Pe- i yan, Zheng Xiao-hong, et al
    2004, 32(3):  88-90. 
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    Through the shear tests of damaged reinforced concrete （RC） beams with simple supports‚the shear-resistant performance of the declining cross section of RC beams reinforced by aramid fiber reinforced plastics （AFRP） was experimentally studied．The results show that the reinforcing technology with AFRP is helpful to the enhancement of the shear strength of the declining cross section of RC beams．
    Influence of Reducing Conditions on the Sintering of Ceramics
    Zhang Yi, Wu Jian-qing, Zeng Xin-jun, et al
    2004, 32(3):  91-93. 
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    The influences of three factors‚such as gas contents in reducing atmosphere‚reducing temper-ature and reducing time‚on the reducing degree of ware sintering were quantitatively investigated by the tube furnace．The thickness of reducing layer was determined by measuring the color variation region on the ware cross section．XRD was adopted to analyze the ware phase transformation before and after the reducing process．The results indicate that the ceramic with 0．47％ （mass fraction） of Fe 2 O 3 and 11．5mm of thickness is completely reduced in two minutes under the reducing conditions of1100℃ and 4％ （mass fraction） of CO．

    Reinforcement Effect of a Novel Modified Nano-CaCO3on Natural Rubber
    Jia De-min, Gu Ju, Zhou Yang-bo, et al
    2004, 32(3):  94-96. 
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