Table of Content

    25 November 2018, Volume 39 Issue 5
    Mathematics
    Existence of Pseudo Almost Periodic Solutions for a Class of Hematopoiesis Models
    ZHANG Ling,XIE Jingli
    Journal of Jishou University(Natural Sciences Edition), 2018, 39(5):  1-3. 
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    Existence of pseudo almost periodic solutions for a class of hematopoiesis models with impulsive effect is studied.The sufficient conditions for the existence of pseudo almost periodic solutions are obtained by using the principle of compression mapping.

    Computational Stability of the Difference Schemes for a Class of Nonlinear Burgers Equations
    MA Yongliu,CAO Yanhua
    Journal of Jishou University(Natural Sciences Edition), 2018, 39(5):  4-7. 
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    Heuristic analysis method is used to determine the stability of the difference schemes for nonlinear differential equations.With this method,we analyze the stability of a class of coupled nonlinear Burgers equations in differential format.The second order coefficient of dissipative term in the modified differential equation is found to be the necessary condition for ensuring the stability of the equation group difference scheme.

    Existence of Positive Solutions of Nonlinear Fractional Differential Equations
    SHI Min
    Journal of Jishou University(Natural Sciences Edition), 2018, 39(5):  8-13. 
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    A class of Caputo nonlinear fractional differential equations with integral boundary conditions in document [1] is generalized in terms of the order and the boundary conditions,and the conditions for the existence of positive solutions of the fractional differential equations are given through Guo-Krasnoselskii fixed point theorem.

    Computer
    Feature Extraction Method for Miao Language Based on BP Neural Network
    DING Li,ZENG Shuiling,XIONG Tao
    Journal of Jishou University(Natural Sciences Edition), 2018, 39(5):  14-18. 
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    Through analyzing the structural features of Miao characters,we extract the typical features and construct the feature matrix. With the BP neural network and the library of handwritten Miao characters,we train the recognition system for identification and classification of Miao characters.

    3D Laser Point Cloud Data Reduction Methods
    HUANG Xiaoming,YANG Jian,CHEN Hui
    Journal of Jishou University(Natural Sciences Edition), 2018, 39(5):  19-23. 
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    The working principle of various 3D point cloud data reduction methods and their effects of reducing the amount of data to improve the processing speed of the algorithm are analyzed.The research status of 3D laser point cloud data reduction methods is reviewed.

    Cross-Age Face Recognition Based on HOG/PCA/SVM
    PENG Sijiang,DAI Houping,ZHOU Chengfu,LIU Qian
    Journal of Jishou University(Natural Sciences Edition), 2018, 39(5):  24-28. 
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    To realize face recognition of different age groups,gradient magnitude and gradient direction are used to measure the image similarity.Firstly,face images from database FG-NET are preprocessed.The HOG algorithm is used to extract the feature values,and then the PCA method is used to reduce the feature values.Finally,the samples are input into the SVM for training,and the face recognition is matched.The matching degree is up to 90.91%.The experimental results verify the effectiveness of the algorithm.

    Implementation of Hotel Room Recommendation Algorithm Based on RFM Model and Collaborative Filtering Technology
    ZHOU Guiru
    Journal of Jishou University(Natural Sciences Edition), 2018, 39(5):  29-32. 
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    In order to improve the personalized recommendation of hotel rooms,an RFM model is proposed to combine with the original collaborative filtering technology.The accuracy and validity of the improved algorithm are verified to be superior to the traditional collaborative filtering algorithm.

    Information
    Impedance Inversion via ATV Regularization and Initial Model Constraint
    LI Shu,LI Ran,JIN Pengcheng,CAO Jihua,CHEN Zeping,ZHOU Yuanling,YANG Xi
    Journal of Jishou University(Natural Sciences Edition), 2018, 39(5):  33-37. 
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    An impedance inversion method via the anisotropic total variation regularization and the initial model constraint is presented.In order to make use of the spatiotemporal information of the seismic data and improve the lateral continuity of the inversion results,multi-trace inversion is used in this method.The experimental results show that even in the case of strong noise interference,this method can achieve good inversion results with small errors.

    Global Calibration Method for Multi-Cameras Vision Measurement System
    HUANG Dongzhao,ZHAO Qiancheng
    Journal of Jishou University(Natural Sciences Edition), 2018, 39(5):  38-45. 
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    A convenient global calibration method for multi-camera system based on two planar targets is proposed,with the two targets  rigidly connected and rotating around the same axis.The pose relation between the two targets can be unknown.This method is not only suitable for the system based on stereo vision,but also for the system based on monocular vision.It has been used in the factory-calibration of four-wheel aligner with 2 or 4 cameras,and the calibration precision meets the requirement.

    Physics
    Three Flavors of Chiral Phases with Vacuum Contribution in the Quark-Meson Model Including the Vacuum Fluctuation
    LU Haipeng,LIU Min
    Journal of Jishou University(Natural Sciences Edition), 2018, 39(5):  46-52. 
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    Because the influence of vacuum contribution on the chiral phase transition,the mean-field approximation is used for quark condensate to obtain the thermodynamic potential,and the PV normalization is used to generate a convergent vacuum contribution in the thermodynamic potential.The model parameters are then redetermined.The solution of the equilibrium equation is applied to determine changes of the condensateas with temperature and chemical potential,and then the influence of vacuum contribution on the chiral phase transition is explained by the condensation and phase diagram.For zero chemical potential,the addition of vacuum contribution will make the  condensaes dissolve slowly,and the temperature and chemical potential corresponding to the phase transition boundary will be higher;the increase of the mσ will make the quark condensaes dissolve slowly.

    Biological
    Bioinformatics Analysis of Trichoderma Reesei  Biodegrading Enzyme CIP 1 and CIP 2
    ZHANG Hong,WEI Xueying,CHEN Jiabei,CHEN Sijia,HE Jianwu
    Journal of Jishou University(Natural Sciences Edition), 2018, 39(5):  53-59. 
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    Bioinformatics analysis was performed on the CIP 1 and CIP 2 genes of biodegradation enzymes of the reported strain Trichoderma reesei QM6a through bioinformatics methods.The physical and chemical properties,secondary structure,signal peptide,localization,transmembrane structure,phosphorylation sites and evolutionary relationships of Trichoderma reesei biodegradable enzyme CIP 1 and CIP 2 were identified.The results showed that CIP 1 and CIP 2 are stable protein,containing a large number of random curls.Signal peptide cleavage sites are between amino acids 19~20,17~18,respectively.Both have no helical crimp structure,no transmembrane domain,and are located on the secretory pathway signal peptide (SP).

    Effects of Gymnocladas Saponin DNA Damage and Serum Cholesterol in Rats
    LI Yubai,HUANG Hongyan,LI Fang
    Journal of Jishou University(Natural Sciences Edition), 2018, 39(5):  60-63. 
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    To investigate the effects of gymnocladas saponin's  antioxidant and DNA damage intervention capacity on rats with high cholesterol levels as well as the effects of gymnocladas saponin on serum cholesterol and relative serum biochemical indexes on targets,48 healthy rats were randomly divided into three groups:a control group,a low concentration gymnocladas saponin group and a high concentration gymnocladas saponin group.Rats of three groups respectively fed with 0,80,200  mg/kg  gymnocladas saponin,who then have DNA damage and high cholesterol levels are induced by H2O2 (0,6,12,18 μmol/L) of different concentration.After 60 days,the collection of the blood sample obtained with the kits are used to test serum level and activity of malondialdehyde (MDA) and glutathione peroxidase (GSH-PX) as well as the damage of lymphocyte DNA by single cell gel electrophoresis (SCGE).As a result of the test,compared with the control group,the different content of MDA and the different activity of GSH in the low concentration gymnocladas saponin group and the high concentration gymnocladas saponin group have statistical significance.The low concentration of gymnocladas saponin group and the high concentration of gymnocladas saponin groups' serum total cholesterol (TC),triglyceride (TG),apolipoprotein B (apoB) are significantly reduced,especially in the high concentration of gymnocladas saponin group.At the same time,the bile acid excretion in two groups of rats increases.The diffenrence of Apolipoprotein A-Ⅰ (apoA-Ⅰ) and high density lipoprotein cholesterol (HDL-C) level effect has no statistical significance.This illustrates that gymnocladas saponin can effectively reduce the level of plasma cholesterol,and can have significant effect on the content of GSH and MDA in serum of healthy young rats and on the protection of DNA damage induced by H2O2.

    Chemistry
    Cu/Fe Co-Catalyzed Cascade Addition/Cyclization of Alkenes Toward Isoquinolinediones
    XIA Lülu,WANG Liangneng,LI Zengzeng,SHENG Huixiang,TANG Shi
    Journal of Jishou University(Natural Sciences Edition), 2018, 39(5):  64-70. 
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    A Cu/Fe-cocatalyzed cascade addition/cyclizaion/cross-coupling of N-methacryloyl halobenzamides with azo reagents toward dual tert-alkylating isoquinolinediones was developed.Under the synergistic CuI/Fe catalysis,alkyl azo reagent mediated a cascade addition/cyclization of N-alkyl-N-methacryloyl halobenzamides,followed by further radical cross-coupling via the cleavage of C—Cl bond with site selectivity,leading to a series of dual tert-alkylating isoquinolinediones in 41%~78% yields.The reaction realized the radical cross-coupling of azo reagent with hyper-conjugated free radicals arising from a prior dearomatzation of methacryloyl halobenzamides and constructed the carbon (tertiary) -carbon bond at the position of C—Cl bond,thereby providing a new idea exploring the tertiary alkyl-aryl cross-coupling reactions.

    Current Situation of Soil Heavy Metal Pollution in China and Countermeasures
    SONG Yuting,PENG Shicheng
    Journal of Jishou University(Natural Sciences Edition), 2018, 39(5):  71-76. 
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    Based on the analysis of the current situation,sources and challenges of soil heavy metal pollution in China,this paper proposes the following countermeasures:firstly,to speed up legislation,improve the system,and manage control according to law;secondly,to strengthen prevention and systematic control;to implement coordinated and scientific management,strengthen responsibility;fourthly,to enhance monitoring and encourage public participation.

    Characteristic column:Study on Wuling Mountain Area
    Industrial Structure in Fuling District and Its Optimization
    WANG Zhibiao,GUAN Saisai,LIU Bingbing
    Journal of Jishou University(Natural Sciences Edition), 2018, 39(5):  77-85. 
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    Variation trend in output value of the primary industry,the second industry and the third industry and that in employment figure in Fuling District are analyzed in the paper.It is find that the variation of gross output value in the second industry is greater than in the first industry and the third industry and the importance of the third industry in employment is greater than the second industry of which the importance is greater than the first industry.Ways to optimize the industrial structure are then proposed,which includes establishing new agricultural development systems,modernizing industrial system,developing modern service industries and achieving harmonious development of industrial structure.

    Adaptive Ontology Construction Method for Citrus Pest Management
    ZHAO Changhua,MI Chunqiao
    Journal of Jishou University(Natural Sciences Edition), 2018, 39(5):  86-89. 
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    A citrus pest keywords extraction algorithm is proposed. This algorithm provides a user friendly interface system in which agricultural experts can upload text descriptions of citrus pests.The system can extract keywords from text files by applying keywords extraction algorithm and comparing it with AGROVOC.Eventually,it will generate citrus pest ontologies.At the same time,agricultural experts can add new pest information in their knowledge database.

    Management
    History,Present Situation,and Prospect of Tourism and Poverty Alleviation in Ethnic Areas
    HUANG Yuanji
    Journal of Jishou University(Natural Sciences Edition), 2018, 39(5):  90-93. 
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    Ethnic areas are rich in tourism resources,and  so poverty alleviation through tourism is effective.However,given the depth of poverty,the large area of poverty,and the complexity of poverty,there is still  much to do in poverty alleviation through tourism.It is necessary to offer sustainable support,to increase investment,and to encourage the engagement of impoverished people. Through these ways,the income of impoverished people can be improved.

    Reflection on the Practice Teaching for Master of Physical Education
    LIU Shaoying
    Journal of Jishou University(Natural Sciences Edition), 2018, 39(5):  94-96. 
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    According to the training objectives of master of physical education,this paper discusses the problems in the practice teaching and proposes some reform approaches.

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