Table of Content

    25 May 2011, Volume 32 Issue 3
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    Mathematics
     Finite Groups with Just 6 Maximal Subgroups
    YOU Xing-Zhong, ZHU Wei-Hua, LIU Zheng
    journal6, 2011, 32(3):  1-3. 
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    The authors investigate how the number of maximal subgroups of a finite group influences its structure and determine the structure of a finite group with just six maximal subgroups in this paper.
    Upper Bounds for Solutions of the Lebesgue-Nagell Equation
    LE Mao-Hua
    journal6, 2011, 32(3):  4-7. 
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    Using a lower bound for two logarithms in the complex case,some exact upper bounds for positive integer solutions of the Lebesgue-Nagell equation are obtained.
    Type Function of Zero Order
    SUN Dao-Chun
    journal6, 2011, 32(3):  8-13. 
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    The author proves the existence of upper type function and lower type function of zero order,and creates conditions to study the function of zero order more precisely.
    Homoclinic Orbits for Second Order Self-Adjoint Difference System with a Change of Sign in the Potential
    HE Xiao-Fei, CHEN Peng
    journal6, 2011, 32(3):  14-18. 
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    The authors we study the existence of nontrivial homoclinic orbits of the second self-adjoint difference system Δ2 u(t-1)-q(t)u(t)+V(t,u(t))=0t∈Z,u∈Rm.Under superquadratic conditions,by using the Mountain Pass Theorem and the Symmetric Mountain Pass Theorem,some existence theorems are established for the existence of homoclinic orbits for the above nonautonomous Hamiltonian systems with a change of sign in the potential.
    Hypothesis Testing of the Dependency of Two-Dimensional Normal Population
    SONG Li-Xin
    journal6, 2011, 32(3):  19-21. 
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    A hypothesis testing of the dependency of two-dimensional normal population is given,under the condition of the sample correlation coefficient with asymptotic normality.Compared with the traditional testing method the asymptotic relative efficiency is 1.The new test statistic is simple,and the new testing method is proved to be easy and feasible.
    Wild Bootstrap Nonparametric Kernel Test for Linearity in AR Regression Models
    WANG Jing-Yong
    journal6, 2011, 32(3):  22-25. 
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    This article considers Wild Bootstrap nonparametric kernel test for linearity in AR regression models,and examines finite sample performance:test size and test power.Simulation results show that test reliability and robustness of Wild Bootstrap is higher than asymptotic method,and test power of TAR and bilinear models is better than the others AR models.
    Least-Square Solutions of Inverse Problems of W-Para-Anti-Symmetric Matrix on the Linear Manifold
    TANG Yao-Ping, ZHOU Li-Ping
    journal6, 2011, 32(3):  26-29. 
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    The least-squares solutions of inverse problems of W-para-anti-symmetric matrix on the linear manifold is discussed,and the general expressions of the solution are obtained.Moreover,for the special case of the least-squares problems,the necessary and sufficient conditions for the solvability and the general solution of this problems are given.
    Computer
    Survey of Keyword Filtering for Anti-Active Jamming in Chinese
    LUO Wan-Wen, GAO Fei, ZHOU Xue-Guang
    journal6, 2011, 32(3):  30-35. 
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    The keyword filtering technology for anti-active jamming in Chinese is reviewed.The current research situation and technology level are summarized,and then the existing problems of the traditional information fitlering are analysed.At last  the trend of  keyword filtering  technology for anti-active jamming in Chinese is put forward.
     Improved Algorithm on SLCA Querying
    ZENG Lin-Ling
    journal6, 2011, 32(3):  36-38. 
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    It is a important problem to find SLCA（Smallest Lowest Common Ancestor）on information retrieves on XML keywords.Through analyzing the semantics characteristics of LSCA,an algorithm on SLCA is implemented by stack on basis of inverted index on keywords and Dewey labeling scheme.
    A New Method of Earthwork Calculation with Topographic Map
    LIU Min
    journal6, 2011, 32(3):  39-41. 
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    A new method of earthwork calculation is introduced based on gathering altitude data with digital topographic map created by several engineering application softwares.This way is easier but quicker and more accurate than manual calculation; therefore it has better application value.
    Physics and electronics
    Method of Treating Data in Metallic Linear Expansion Coefficient Experiments Based on Origin
    LIU Yang
    journal6, 2011, 32(3):  42-43. 
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    The Origin software is applied to the linear fitting and mapping of the data in metallic linear expansion coefficient experiment.The experiment result shows an excellent accordance with the results of data treatment by the method of successive difference.The experiment is concise,rapid,and direct,and it can avoid producing error from the manual treatment.
    Optical Absorption in Terahertz-Driven GaAs Quantum Well
    SHI Chang-Bai, PENG Jin-Zhang
    journal6, 2011, 32(3):  44-47. 
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    The optical absorption spectra in quantum well driven by both an intense growth-direction-oriented terahertz (THz) and an optical pulse are calculated within the theory of density matrix.It is shown that the electric field produces multiple absorption peaks which come from the quantum confined Stark effect.Much rich optical absorption spectra and the excitonic peak spiting show up when changing the THz field intensity.The Autler-Towns splitting results from the THz nonlinear dynamics of confined excitons and result in the band side generation.
    Novel Simulation Research on Double Closed-Loop of Three-Phase PWM Rectifier
    LEI Mei-Yan, OuYang-Chang-Hua , ZHU Jun-Jie
    journal6, 2011, 32(3):  48-50. 
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    The basic principle of three-phase PWM rectifier is introduced.The control strategies of decoupling of input and output current based on feedback and the methods of PI regulation are used,and the simplified mathematical model of the PWM rectifier of the current inner loop and outer voltage is established,which is based on the model of the d-q synchronous rotating coordinate system in three-phase rectifier.A simulation model of the PWM rectifier,which can achieve the stability of the output voltage,is established by the MATLAB R2009a.The simulation results verify that the proposed method is effective and practical.
    Design of CMOS RF Mixer Based on Gilbert Cell
    ZHOU Shao-Hua
    journal6, 2011, 32(3):  51-54. 
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    A novel double channel quadrature mixer is proposed in the paper.In this mixer,polycrystal resistance,source injection current of switch transistor,series inductor of common source node,degeneration impedance in driving stage were adopted.The circuit was designed and simulated by Candence.The results indicated that the SSB noise factors were 7.47 dB/Hz@ 1 MHz,9.35 dB/Hz@ 1 MHz and 16.39 dB/Hz@10 kHz when the input power was equal to 3 dBm with VDD=1.8 V.In addition,the conversion gain decreased to 8.46 dB to increase linearity,and the 3th point of intermodulation was 8.42 dBm.
    Information and Engineering
    Face Recognition Based on Linear Transformation Theory
    TAN Zi-You, LIANG Jing
    journal6, 2011, 32(3):  55-58. 
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    This paper mainly introduces the application of linear transformation matrix in pattern recognition,face recognition based on Principal Component Analysis (PCA) and Two-dimensional Principal Component Analysis (2DPCA).and the source and algorithm in matrix theory.A kind of innovative method of analyzing is put forward,namely PCA+2DPCA,which is to get the engenvector through 2DPCA and achieve the optimal compress through PCA,and thus reduce the number of dimensions.
    Overview of Energy Efficient Routing Protocols in Wireless Sensor Networks
    DENG Xiao-Fei, XU Qian, HUANG Guang-Ya
    journal6, 2011, 32(3):  59-62. 
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    Energy efficiency is a hot and key research point in wireless sensor networks routing protocols.The development of energy efficient routing protocols in wireless sensor networks is introduced.Then the fault tolerance and robustness of the protocols are studied.And the applications of the protocols are given.According to the current researches on the protocols,the prospective research of energy efficient routing is summarized.The commercialization and industrialization of the wireless sensor networks may be promoted.
    Application of CNC Lathe Based on Gun Drill System
    ZHANG Qun-Ying, DONG Da-Hua
    journal6, 2011, 32(3):  63-66. 
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    Nuclear reactor inner component is the most critical nuclear equipment because it must be able to endure the irradiation of high neutron fluence and the corrosion of the coolant and it must remain adequate strength in high temperature and under great load.Aiming at the problems of reactor in-pile shore,reactor core shore,reactor core quadratic shore and deep hole processing,the gun drill system is introduced in CKD6183×3000 CNC lathe produced by Jinling Machine Co. Ltd.This method not only solve the problem of postwelding deep hole processing,but also meet the customers' requirements for increasing the precision,reducing the operator labor intensity,and improving the production efficiency.
    Application of Series Compensation in Sewage Plant Power System
    ZHU Jing-Gang, LI Xiao-Mei, SONG Zhi-Jie
    journal6, 2011, 32(3):  67-69. 
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    Based on the characteristics of power system and the actual operating experience of sewage plant power system,this article detailedly discusses how to use the series compensation mode of reactor and condenser to realize harmonic governance and reactive power compensation.
    Analysis of Noise at Work in Different Eccentricity and Times the Shear Coefficient of IHI Swing-Flying Shearing
    LI Qin, TANG Qian-Peng
    journal6, 2011, 32(3):  70-73. 
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    The paper analyses the structure and operating principles of IHI swing-flying shearing，then establishes the kinematics model for shearing framework,and compiles analysis program with powerful MatLab language in mathematic and graphics.Movement track curves for edge of shearing-knife are obtained in different eccentricity and different times.This paper also explores the noise influence in shearing work of different eccentricity and times from quick return characteristics of trajectory.
    Biological resources
    New Recorded Plants from Wuling Mt.in Hunan Province (Ⅳ)
    ZHANG Dai-Gui, XU Liang, LI Jin-Zhong, CHEN Gong-Xi
    journal6, 2011, 32(3):  74-77. 
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    Some new recorded plants of Wuling Mt. in Hunan are reported,including 2 genera,Heteropappus Less. and Faberia Sch.-Bip. 14 species of 13 genera in 4 families are reported.They are Valeriana flaccidissima Maxim.,Dipsacus tianmuensis C. Y. Cheng et Z. T. Yin,Heteropappus hispidus (Thunb.) Less.,Sinosenecio guizhouensis C. Jeffrey et Y. L. Chen,Parasenecio hwangshanicus (Ling) Y. L. Chen,Saussurea veitchiana Drumm. et Hutch.,Paraprenanthes glandulosissima (Chang) Shih,Carpesium faberi Winkl.,Ainsliaea trinervis Y. C. Tseng,Ligularia leveillei (Vant.) Hand.-Mazz.,Faberia nanchuanensis Shih,Primula fangingensis F.H. Chen & C.M. Hu,Primula odontocalyx (Franch.) Pax,and Lysimachia pseudotrichopoda Hand.-Mazz.The new records species of Vernonia patula (Dryand.) Merr. and Blainvillea acmella (Linn.) Philipson are rectified.
    Isolation and Molecular Identification of Endophytic Fungi JSM 10 from Huperzia crispate
    HE Le, LIU Zhu-Xiang, ZHU Jie, LI Xiao-Teng, CHEN Qi-Hui, XIONG Li-Zhi
    journal6, 2011, 32(3):  78-81. 
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    Endophytic fungi JSM 10 was isolated from surface-sterilized Huperzia crispate.Phylogenetic analysis of JSM 10 was carried out based on ITS gene sequences.Phylogenetic analysis result showed that JSM 10 strain was closely related to the recognized members of the genus Fusarium,in which strain JSM 10 resembled Fusarium oxysporum at a rate of 99% and JSM 10 was identified as Fusarium oxysporum.
    Cloning and Sequencing of Cyclohexanone Monooxynase Gene from Rhodococcus ruber JDM312
    PENG Zhe-Hui, XU Da-Kui, WANG Jing-Fang, WU Lu-Mu-Han-.Zi-尔Bie-Ke
    journal6, 2011, 32(3):  82-85. 
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    The chnB gene encoding a cyclohexanone monooxygenase was amplified by PCR from genomic DNA of Rhodococcus ruber JDM312,the PCR product was cloned into the pUC18 vector and sequenced,and the sequence identity searches were performed by using software Clustal X and Mega 3.1.The sequence analysis showed that the open reading frame of the chnB gene from Rhodococcus ruber JDM312 was 1 623 bp and codes for a polypeptide of 542 amino acids.DNA identities of the chnB genes between the JDM312 strain and the previously reported four other stains of Rhodococcus was 85% to 98%,and the phylogenic tree showed that these strains clustered one main branch.It can be concluded that the chnB gene of Rhodococcus ruber JDM312 is useful to further study on expression of cyclohexanone monooxygenase and its enzymatic activity.
    Current Pollution Situation Investigation of the Underground Water in Xiangxi Autonomous Prefecture
    LI Ying
    journal6, 2011, 32(3):  86-90. 
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    According to the hydrogeological property and laws of water abundance,well samples were selected and analyzed.The result showed that among the 54 wells in Xiangxi autonomous prefecture there were 13 wells with excellent water quality,33 wells with good water quality,7 wells with poor water quality and 1 with awful water quality.The average composite index of 33 water wells surveyed ( clean included ) was 2.548,and the composite index of 21 pollution monitored wells（hot point included）was 1.935；there was no industrial and urban pollution surrounding 6 wells,and the water quality composite index of the wells was 1.182,which was obviously superior to others.The quality of underground water of Xiangxi autonomous prefecture is not optimistic and the underground water needs to be protected immediately.
    Chemistry and chemical engineering
    Catalytic Synthesis of the Cyclohexyl Lactate with Microwave Irradiation and Ferric Sulfate Hydrate
    CHEN Xiao-Yuan, WANG Qi-Qin, CHEN Hong-Jun
    journal6, 2011, 32(3):  91-95. 
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    The synthesis of cyclohexanol and lactic acid as reactants,ferric sulfate hydrate as catalysts under microwave irradiation has been studied.The influence conditions on yield of esterification,such as the ratio of cyclohexanol to lactic acid,the reaction time,the amount of catalyst,the optimum volume of water-taking agent,and microwave power were investigated.The result indicated that the optimum reaction conditions were as follows:ratio of alcohol to acid was 2∶1,the use level of catalyst ferric sulfate hydrate was 2.5 g/0.05 mol,reaction time was 25 min,water-taking agent cyclohexane was 6 mL,and microwave power was 640 W.Under such conditions the esterification rate could reach 91.9%.
    Treatment Wastewater Using Vivo Fusarium Sp.-A High Manganese Resistant Fungus
    CAO Jian-Bing, LI Xiao-Ming, 欧Yang-Yu-Zhu , ZHENG Wei, WANG Dong-Bo
    journal6, 2011, 32(3):  96-99. 
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    A strain capable of tolerating and accumulating manganese was separated from manganese-electrolyzed slag.And then it was identified by molecular biology method,and the mechanism of removing manganese was studied by the Scanning Electron Microscope.The result showed that the name of the fungi was Fusarium sp.,which can survive in the medium with 3000 mg/L manganese,and has high removal efficiency of manganese from manganese waste water.The removal efficiency can reach 97.5% under the concentration of Mn2+ 500 mg/L,pH value 6,150 r/min rotation speed,28 ℃ for 48 h.
    Catalytic Oxidation Separation of Nickel and Molybdenum in the High Carbon Nickel Molybdenum
    KUANG Lin-Xiong, YAN Wen-Bin, ZHOU Xiao-Jiang
    journal6, 2011, 32(3):  100-102. 
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    The craft method of catalytic oxidation separation of high carbon nickel molybdenum was studied,and the craft condition was discussed.The best separation condition of nickel and molybdenum in the high-carbon Nickel molybdenum was identified by the single factor test:the sulfuric acid concentration was 15%,excess coefficient of pyrolusite was 20%,liquid-solid ratio was 1∶3,response time was 6 h,and reaction temperature was 95 ℃; when the mass ratio of catalyzer C and nickel is 4.4,the leaching rate could reach 95.84%,the leaching rate of molybdenum was only 3.74%,and the molybdenum mainly gathered in the residue in the form of molybdic acid.In such conditions,the preliminary separation of nickel and molybdenum was realized.
    Economics
    Research on Income Difference between Urban and Rural Inhabitants During Tourism Development in Zhangjiajie
    LI Min
    journal6, 2011, 32(3):  103-107. 
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    Based on analysis of income changes of rural residents and urban residents in Zhangjiajie,this paper put forwards that Zhangjiajie`s tourism industry has brought significant difference to the urban and rural incomes.From tourists' activities and consumption,urban and rural employment quality,operational income of urban and rural residents,this paper analyses the reasons for this difference.Finally from developing rural tourism with greater efforts,speeding up the construction of rural markets of local products,improving rural infrastructure,expanding rural employment,optimizing the employment structure of rural residents,measures are put forward to balance the income between urban and rural residents during the development of tourism in Zhangjiajie.
    Development and Protection Of the Geomorphological Tourist Resources In Xiangxi
    ZHUANG Da-Chun, WANG Cheng-Song
    journal6, 2011, 32(3):  108-111. 
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    Through field investigation and analysis of the relevant document literature,the fundamental types and the major geomorphological tourist resources in Xiangxi are studied.Geomorphological tourist resources in this area include quartz sandstone peak forest landform,karst landform.Danxia landform,and so on,which are widely scattered and are in large quantity and good quality.But there are many problems as for the resource development,such as poor infrastructure,lack of overall development protection planning,environmental  deterioration,and so on.Accordingly,some proposals are put forward.
    Management
    Causes of Lack of Skilled Workers in Manufacturing Enterprises and the Related Countermeasures
    ZHAO Xuan-Li
    Journal of Jishou University(Natural Sciences Edition), 2011, 32(3):  112-114. 
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    The causes and results of lacking skilled workers in manufacturing enterprises are analyzed,and the countermeasures are thus put forward to enhance the cultivation of skilled workers and improve the management mechanism of skilled talents.
    Economics
    Policy on the Change of CNY Exchange Rate in China
    LIU Li-Xiao
    journal6, 2011, 32(3):  115-119. 
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    The article studies  the CNY exchange rate.The purpose of the article is to summaize the effective measures to tackle the problems on CNY exchange rate.It describes the adjustment mechanism of CNY exchange rate and the reasons which cause the pressure of CNY appreciation.It analyzes the positive and negative effects of CNY appreciation on economic development.Finally,the article concludes the measures which Chinese govement should take,such as optimizing and upgrading industry and trade structures,expanding domestic needs,absorbing the enormous foreign exchange reserves,and so on.
    Education and teaching
    Reform in Teaching of College Physics Experiment
    LI Chun-Fang
    journal6, 2011, 32(3):  120-122. 
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    The paper introduces the ideas of constructing physics experiment teaching system on three levels-changing teaching methods,reforming examination and improving teacher diathesis.The importance of creating space for individual development and fostering student's practice and innovation abilities is emphasized.
    Primary Problems and Countermeasures in Teaching of Communication Principle
    LIANG Ping-Yuan, TAN Zi-You, HUANG Guo-Sheng, DENG Xiao-Fei
    journal6, 2011, 32(3):  123-125. 
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    Communication Principle is a very important specialized basic course in informational curriculum.In view of the features of this course including profound theory,extensive application and degree of difficulty in study,the major problems in Communication Principle teaching are analyzed,and the countermeasures are proposed correspondingly.These countermeasures include various patterns and methods of teaching,particularly development of learning interest and innovation consciousness.In the end,the circumstance of training teachers of this course is introduced,and novel demands for teachers are proposed when they are in instruction.
    Sports
    Influence of Ballgame on University Students’ Depth Perception
    SONG Zu-Jun, LI Heng
    journal6, 2011, 32(3):  126-128. 
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    The depth perception involves the three-dimensional space consciousness,which includes the consciousness of height,width,distance,and depth.Sharpening the university students’ depth perception will enhance their ability to make the emergency escape from danger.Frequent participation in the ballgame can sharpen university student’s depth perception.This article mainly uses document literature,experimentation,mathematical statistics and logical analysis to study the influence of ballgames on the depth perception by testing and analyzing 48 students’ depth perception in Huaihua University.The fitness value of ballgames for university students is thus testified.
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