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    28 June 2010, Volume 16 Issue 3
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    Mathematics.Physics and Chemistry
    Nonlinear Bending of Saturated Poroelastic Cantilever Beam with Nonconservative Concentrated Load
    YANG Xiao,ZHOU Dong-hua
    2010, 16(3):  221-225. 
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    Assumption made in the mathematical model for large deflection of microscopic incompressible  saturated poroelastic beam is that fluid in pores can only flow in the direction of a deformed axis. Based on this model, nonlinear quasi-tatic bending of a saturated poroelastic cantilever beam with fixed end impermeable and free end permeable,  with a suddenly applied nonconservative concentrated transverse load at its free end, is investigated with the Galerkin  truncation method. The curves of deflections and bending moments of the beam skeleton are shown with respect to time and the beam axis. Numerical results show that, for small loads, there is little difference between results for the nonconservative  and conservative concentrated load and between large nonlinear and small linear deflection models. For large loads, results of large nonlinear deflection model are smaller than those of small linear deflection model. Results for the nonconservative loads are larger than those for conservative loads. The difference increases with load. Further, when a concentrated load is suddenly applied, deformation of the beam skeleton does not instantly occur. Deflection of the poroelastic beam increases and finally converges to a stationary state in which the poroelastic beam skeleton takes the entire external load.

    Aerosol Transport and Transformation Characteristics in Foggy Weather
    DING Jue,LI Jia-hua,WENG Pei-fen
    2010, 16(3):  226-231. 
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    In recent years, with the urban construction and economic development, the problem of aerosol pollution is becoming increasingly serious. Especially for foggy weather in urban areas, aerosol particles form a primary pollutant. This calls for people’s concern to deal with the fog pollution problem for clean air. This paper focuses on the basic characteristics of aerosol particles and fog, including turbulent diffusion of aerosol particles, chemical transformation and dynamical characteristics. In addition, a detailed investigation on the aerosol transport problem in China and other countries is made, and the direction of the studies is discussed. 

    A Variation-Difference Method for Subsonic Flow Simulation
    LI Zhong-yu,LI Xiao-wei,[LIU Gao-lian]
    2010, 16(3):  232-236. 
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    A variation-difference method (VDM) is developed for computation subsonic flow. This method is simple and effective in constructing the relationship between cell nodes by combining the variational principle with the differential formula derived from directional derivative. The method is implemented in computations of the flows over circular cylinder and the NACA0012 airfoil. Numerical results show that VDM has high accuracy in subsonic flow simulation.

    Rubber Mechanical Property of Stress Cone in Variable Temperature Fields
    LU Zhong-ya1,MA Yong-qi1，2,XU Cao3
    2010, 16(3):  237-241. 
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    Mechanical behavior of large-scale deformation for rubber stress cone of high voltage cable accessories was studied with a German Zwick020 material test machine. Stressstrain relation curves were obtained under different temperatures and different loading rates. From these curves, influences of temperature and loading rate were analyzed. The material’s mechanical properties were theoretically analyzed with the Mooney-Rivlin model, and some fitting parameters of the material were got from experimental data. Two constitutive equations of material were then constructed, and the stress obtained in the experiment was compared with theoretical calculation. It shows that the equations are suitable in engineering practice and can be used for further research.

    Dynamical Properties of Two-Torus and Planar Piecewise Parabolic Maps
    LIN Cong-ping,FU Xin-chu,WANG Kai-hua
    2010, 16(3):  242-247.  doi:O175.12
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    This paper discusses isomorphism between invertible torus parabolic maps and periodicity where periodic point sets in horocyclic case are dense in the torus topology, and some semi-rational cases possess periodic points of all periods. For the integral parabolic maps on the torus, the topological entropy is zero. Symbolic entropy and complexity of planar piecewise parabolic maps are investigated. Their difference under the plane topology and the torus topology respectively for the same torus parabolic maps is also discussed.

    Yetter-Drinfeld Module over Weak Hopf π Coalgebra and Center Construction
    ZHANG Xiang,WANG Qing-wen
    2010, 16(3):  248-252. 
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    This paper studies Yetter-Drinfeld modules over weak Hopf π coalgebra, discusses its properties over weak Hopf π coalgebra and gives its equivalent condition. The paper introduces monoidal categories, center and weak center over monoidal categories, which are divided into left and right centers. Based on these, the relations between the center and the Yetter-Drinfeld modules categories are studied, and it is proved that the center and the Yetter-Drinfeld module categories are isomorphic. Weak Hopf π coalgebra and its structure are further studied. 

    Block Structure of Vector-Valued Padé-Type Table in the Inner Space
    SU Rui,PAN Bao-zhen
    2010, 16(3):  253-256. 
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    A vector-valued Padé-type approximation is defined in the inner space by introducing a generalized linear functional from a polynomial space to a vector space. With the error formula for vector-valued Padé-type approximation, the orthogonal polynomial with respect to a generalized linear functional is defined. The block structure of Padé-type table is derived. The structure can be used to reduce computation of Padé-type approximations. An example is given to illustrate effectiveness of the method.

    Equivalence of Several Conjectures for Convex Geometry
    BO Shi-song,HE Bin-wu
    2010, 16(3):  257-261. 
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    Convex geometry is an important branch of modern geometry. Convex bodies and star bodies are a main object of study with many unsolved open problems and conjectures. Although these problems and conjectures are different, they are actually equivalent. In this paper, we discuss the connection of several conjectures such as isotropic constant conjecture, slicing problem, Busemann-Petty problem, and reverse Brunn-Minkowski inequality. We give proofs of the equivalence.

    p-perfectly Convex Set and Absolutely p-perfectly Convex Set
    ZHANG Duan,LIU Xu-fei,LENG Gang-song
    2010, 16(3):  262-267. 
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    In this paper, we definite the p-perfectly convex set and absolutely p-perfectly convex set, and study the relationship among p-convex set, p-perfectly convex set and absolutely p-perfectly convex set in the Banach space. Some properties of p-perfectly convex set and absolutely p-perfectly convex set are given (0

    Minimal Subgroups and Cyclic Subgroups of Order 4 with Semi-Cover-Avoiding Property
    ZHANG Fang-suo,GUO Xiu-yun
    2010, 16(3):  268-271. 
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    A subgroup H is said to be semi-cover-avoiding in a group G if there is a chief series 1=G01<…l=G such that for every j=1,2,…,l, either H covers Gj/Gj－1 or H  avoids  Gj/Gj－1. In this paper, some new necessary and sufficient conditions for a finite group G to be nilponent or supersolvable are given by using minimal subgroups and cyclic subgroups of order 4 with semi-cover-avoiding property in the group. Some known results are generalized. 

    Bound of Maximum Probabilities of Successful Substitution for Systematic Uniform Authentication Codes under Certain Parameters
    YANG Jian-sheng,MA Yan-bin
    2010, 16(3):  272-276. 
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    This paper constructs a new finite geometric structure over the Galois field and studies some properties of the structure. By removing the parallel lines of the structure, a new lower bound of maximum probabilities of a successful substitution for systematic uniform authentication codes is derived under certain parameters if encoding rule distributions are equiprobable.

    Perturbation of Weighted Frames in Hilbert Space and Applications
    MA Ya-li,YE Wan-zhou
    2010, 16(3):  277-280. 
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    Because the weighted frame possesses good redundancy, it supplies useful information for signal reconstruction and image processing. This paper borrows ideas from the research on the Riesz frame perturbation in the Hilbert space, and in particular, discusses the topic that a weighted frame has the similar perturbation result. Furthermore, application of weighted frames in the practical signal denoising is considered, and the idea of the framed threshold de-noising is proposed.

    Computational Prediction of Protein-DNA Interaction Based on Wavelet Transform
    JIANG Hao,FENG Tie-nan,QIN Dian-gang,WANG Yi-fei
    2010, 16(3):  281-285. 
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    Protein-DNA interactions are vital for many processes such as transcriptional regulation and DNA modification in living cells. This paper uses the modified resonant recognitions model to predict interactions between yeast proteins and DNA. The difference of distributions of signal-to-noise ratio (SNR) between the positive data and the random data are found using wavelet transform. Satisfactory results are obtained by choosing an appropriate threshold.

    Estimation of Upper Bound for Number of Solutions of a Kind of Congruence
    MA Ji-guo
    2010, 16(3):  286-289. 
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    The problem of the solution number about m=(m1,m2,…,m2r) was studied, when the congruence  can be solved. By introducing an elementary method, we obtain the solution number of m in the congruence when r=4. 

    Nonparametric Bayesian Estimation Based on Interval Censored Data
    ZHOU Li-ping,CHENG Jian-qiang,HE You-hua
    2010, 16(3):  290-296. 
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    The nonparametric Bayesian estimation of population distribution with interval censored data based on Dirichlet process as a prior distribution is gived. By random simulation for some common distributions, the effects of some prior distributions on the estimated results are discussed. Comparison between the proposed method and the parametric maximum likelihood method shows similar estimation effects.

    Environmental and Chemical Engineering
    Effect of CeO2Doping on Dispersion of CuO/γ-Al2O3 Sorbent Catalyst and Its Characteristics in Flue Gas Desulfurization
    LI Wei-qing,WANG Hui,LIU Guo-jie,ZHOU Li,SUN Jian
    2010, 16(3):  297-301. 
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    CuO/γ-Al2O3 sorbent catalysts prepared by stepwise impregnation were studied using the X-ray diffraction (XRD), H2 temperatureprogrammed reduction (H2TPR) and thermogravimetric analysis (TGA) experiments. Results showed that the dispersion capacity of CuO loading on γ-Al2O3 was 0.042 g/100 m2. Two forms of CeO2 on γ-Al2O3 were observed: one consisted of highly dispersed entities (called 2D-Ce), and the other were relatively large three dimensional particles (3D-Ce). The controlled addition of CuO/γ-Al2O3 improved catalyst dispersion, substantially increased the absorption capacity and absorption rate and the cycling life of CuO/γ-Al2O3.

    Effects of 6-hydroxylated Polybrominated Diphenyl Ethers-47 on Anti-Oxidative Systems of A549 Cells
    ZHAO Jin-yu,ZHONG Yu-fang,WANG Yi-pei,WANG Yang-jun,
    2010, 16(3):  302-305. 
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    Polybrominated diphenyl ethers (PBDEs), a class of persistent organic pollutants, were proved to be endocrine disruptors and neurotoxic agents. However, there are few reports about the toxic effects of their hydroxylated metabolites. Our objective was to investigate the cytotoxicity of 6-hydroxylated2,2′,4,4′tetrapolybrominated diphenyl ethers (6-OH-BDE47) and its effects on anti-oxidative systems in A549 cells after acute exposure. The results show that 6-OH-BDE47 has obvious cytotoxicity, and the A549 cell survival gradually decrease after exposure in a dose and time-dependent manner. Acute exposure experiment confirmed that the oxidative stress system of A549 cells was seriously impaired by 6-OH-BDE47. When the final concentration of 6-OH-BDE47 in culture medium was higher than 0.5 μmol/L, the total superoxide dismutase (T-SOD) content in treatment group cells increased by 1.03  times compared to the control group cells; and ≥ 2.0 μmol/L of 6-OH-BDE47 reduced the glutathione content by 71.2%. These results suggest that 6-OH-BDE47 has certain cytotoxicity on A549 cells and can impair oxidative stress responses as evidenced by increased SOD activity and decreased GSH.

    Computer Engineering and Science
    Design of Vision System for Multi-Robots under Varying Lighting Condition
    HE Xiang,YUAN Jian,XU Hua-hu,HE Yong-yi,WANG Ya-hong
    2010, 16(3):  306-311. 
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    A robot collects environment information mainly by its vision system. In order to improve recognition accuracy and positioning precision under variable lighting conditions, this paper describes a new pattern design and proposes a method to adjust the color threshold according to the credibility of current color threshold. Image morphology is used to optimize the recognition results. The vision system is tested in the project Family Life Support MultiRobot Systems.

    Pencil Drawing Generation Based on Texture and Profile
    SANG Sang,HAO Peng-yi,DING You-dong,SHI Yun-yu
    2010, 16(3):  312-317. 
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    To avoid the drawbacks of image segmentation used in many pencil drawing researches, we propose a new solution to generate pencil drawing based on texture and profile. Principal component analysis (PCA) is used to analyze the original image, and parameters of high-boost filter (HBT) determined. Edges in the image are located by combining some similarity measures. Line integral convolution (LIC) is used to generate the original image’s texture. Pencil drawing is finally created by superposition of the edge image and the texture image. Experimental results show that the proposed method is simple and effective.

    A Hybrid Personal Recommendation Algorithm Based on Designated Group Interest
    BI Hang,XU Wei-in
    2010, 16(3):  318-322. 
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    Personalized recommender services provide users with the preference items based on their interests.It has been applied to various areas such as website navigation, indexing and retrieving system of digital libraries, Ecommerce, search engine. Having studied recent developments in the relavent areas, we propose a new algorithm based on a esignated group that using fuzzy clustering combined with two collaborative filtering techniques. The result shows that the roposed algorithm can solve the problem of sparsity and improve quality of preferences.

    Mechatronics Engineering and Automation
    Harmonic Current Detection Algorithm for Active Power Filter Based on Artifical Neutral Networks
    LI Zhi-ua,LIU Zhen,Lv Zhen-in
    2010, 16(3):  323-326. 
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    Effectiveness of active filter rely on the availability of a reference signal which reflects the armonic component to be compensated for. As a result, a key issue in the study of active ilter is to develop a good current etection algorithm. In view of this, we analyze the working principle and system structure of active power filter, propose a ew current detection algorithm using neural networks, and design a parallel three-hase active power filter. In the omputer simulation, the total harmonic distortion (THD) is low. The results are in agreement with the theoretical analysis,and therefore confirm validity and feasibility of the new algorithm.

    Life Science
    Effects of Antioxidant Part of Astragali Radix and Its Combination with Panax notoginseng saponins on Atherosclerosis
    XU Jiang-bo,WANG Tuo,WENG Xin-chu
    2010, 16(3):  327-330. 
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    Antioxidant part of Astragali Radix was determined with an oil stability index (OSI) method. An experimental atherosclerosis in quails was established to observe the effects of the antioxidant part of  Astragali Radix and its combination with Panax notoginseng saponins (PNS). After 8 weeks of feeding with the antioxidant part of Astragali Radix and its combination with PNS, the total cholesterol (TC), triglyceride (TG), low density lipoprotein (LDL-C), high density lipoprotein (HDL-C), total antioxidant capacity (T-AOC), superoxide dismutase (SOD), and malondialdehyde (MDA) in serum were measured. The results show that, compared with atherosclerosis (AS) model quails, the serum TG, TC, LDL-C, MDA are obviously lower (P＜0.1) while T-AOC, SOD are totally opposite, indicating that the antioxidant part of Astragali

    Radix and its combination with PNS have good effects in antiAS.

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