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    An Improved Whale Optimization Algorithm Based on Levy Flight and Brownian Motion
    YU Cunwei, MO Liping, WAN Runze
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (2): 24-32.   DOI: 10.13438/j.cnki.jdzk.2023.02.004
    Abstract594)      PDF(pc) (1094KB)(293)       Save
    A whale optimization algorithm based on Levy flight and Brownian motion is designed to overcome the disadvantages of whale optimization algorithm such as low accuracy,slow convergence and easiness to fall into local optimum.First,Levy flight method is used to initialize the whale population to increase the diversity of the initial population.Then,according to the principle of Brownian motion,the position update of the whale population is randomly perturbed to avoid the algorithm falling into local optimization in advance.The improved whale optimization algorithm is compared with whale optimization algorithm,particle swarm optimization algorithm,genetic algorithm and ant colony optimization algorithm on seven different benchmark test functions.The experimental results show that the improved whale optimization algorithm is superior to the other four algorithms in terms of solution accuracy and convergence speed.At the same time,simulation and comparison experiments are carried out on the initial solution exploration range of the improved whale optimization algorithm using Levy flight strategy and the whale optimization algorithm using random search strategy in the initialization stage.The experimental results show that the improved whale optimization algorithm can avoid falling into local optimization in a certain program.
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    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (2): 96-96.  
    Abstract142)      PDF(pc) (146KB)(187)       Save
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    Lattice Boltzmann Numerical Method for the Extended Fisher-Kolmogorov Equation
    FENG Yingxin, DAI Houping, WANG Chen, WEI Xuedan
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (4): 19-30.   DOI: 10.13438/j.cnki.jdzk.2023.04.003
    Abstract215)      PDF(pc) (2738KB)(165)       Save
    A new numerical format for solving the extended Fisher-Kolmogorov (EFK) equation is constructed based on the lattice Boltzmann method.The Taylor expansion and Chapman-Enskog multiscale expansion techniques are used to obtain the local equilibrium state distribution functions and correction functions of the lattice Boltzmann model for the one-and two-dimensional EFK equations,and to further recover the corresponding macroscopic equations.On this basis,stability conditions for the iterative format of the model are derived,and the model is used to solve the initial marginal value problem of the EFK equation.
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    Delayed Predator-Prey Model with Stage-Structure and Cannibalism
    ZHANG Zizhen, ZHANG Weishi
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (4): 1-8.   DOI: 10.13438/j.cnki.jdzk.2023.04.001
    Abstract256)      PDF(pc) (1054KB)(164)       Save
    A delayed predator-prey model with stage-structure in prey population and cannibalism in predator population is studied in the present paper.Taking the pregnancy delay of predator population as the bifurcation parameter,local asymptotic stability and existence of local Hopf bifurcation of the model are discussed by using the eigenvalue method,and the critical value of the delay at which the local Hopf bifurcation exhibits is derived.Then,the properties of the Hopf bifurcation are studied by means of the central manifold method.Finally,a simulation example is performed to verify the correctness of the obtained results.
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    Research Status of Chinese Ethnic Traditional Sports Based on Knowledge Graph Visual Analysis
    LI Ping, WU Mengyi, ZHOU Zili, ZHANG Chunxiao
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (4): 91-96.   DOI: 10.13438/j.cnki.jdzk.2023.04.011
    Abstract227)      PDF(pc) (3959KB)(164)       Save
    Taking the research on traditional ethnic sports in China in recent 10 years as an example,this paper uses CiteSpace 6.1.R6 software and makes visualization analysis  of 211 core journal papers and 710 master and doctoral papers collected in CNKI database from 2010 to 2022,and analyzes the development of traditional ethnic sports from the chronological perspective.The results showed that in 2017,the number of papers published in the core journals of ethnic traditional sports research reached its peak,and then the number of related literatures decreased.The overall development trend can be summarized into three periods,namely stable period,peak period and cool-off period.Research hotspots include inheritance,development,traditional sports and sports culture,etc.The key words include "current situation","colleges and universities","development situation" and "Wushu".The research field mainly focuses on the connotation,development,inheritance and innovation of traditional national sports.The development of Chinese ethnic traditional sports has begun to take shape.The future research trend will be explored with the requirement of modernization development as guidance.
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    Differentiability for Measure Neutral Functional Differential Equation
    TIAN Rui, LI Baolin
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (2): 1-6.   DOI: 10.13438/j.cnki.jdzk.2023.02.001
    Abstract286)      PDF(pc) (323KB)(160)       Save
    In the framework of the theory of generalized ordinary differential equations,by virtue of the one-to-one correspondence between measure neutral functional differential equations and generalized ordinary differential equations,sufficient conditions for differentiability of measure neutral functional differential equations are put forward.On the basis of defining a new operator Ψ(λ,y)(t),differentiability for measure neutral functional differential equations is proved.
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    Synthesis,Crystal Structure of the Novel Rhodium(Ⅱ) Complex
    LIU Xue, TIAN Yiran, FENG Yangyang, XU Mingming, CHEN Honglai, HOU Wenming, ZHANG Zhenqiang, LIU Weiping
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (4): 55-68.   DOI: 10.13438/j.cnki.jdzk.2023.04.007
    Abstract248)      PDF(pc) (10002KB)(156)       Save
    Using rhodium(Ⅱ) acetate and trimethylrhodium acetate(Ⅱ) as the raw material,with 3,6-dibromo-9-(4-pyridinemethyl)-9H-carbazole (DBPMC1) and 3,6-dibromo-9-(3-pyridinemethyl)-9H-carbazole (DBPMC) as axial ligands,four rhodium(Ⅱ) carboxylates axial dibromo-9-pyridylmethyl-9H-carbazole complexes Rh(OOCR)4(DBPMC) were designed and synthesized.The single crystals of compounds were successfully cultured and their chemical structures were initially characterized by modern analytical methods such as H NMR,13C NMR and FT-IR.The results show that none of these four compounds has been reported in the literature,and they belong to a new type of rhodium carboxylate (Ⅱ) axial complex.The structure of the complex was determined by X-ray single crystal diffraction analysis to be composed of one molecule of rhodium(Ⅱ) carboxylate and two molecules of DBPMC ligand,and the molecular structure diagram and unit cell stacking diagram were drawn.
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    D-N Alternating Method Based on the Curved Edge Finite Element for Anisotropic Exterior Problems in a Concave Angle
    TU Mingyue
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (4): 31-38.   DOI: 10.13438/j.cnki.jdzk.2023.04.004
    Abstract197)      PDF(pc) (374KB)(152)       Save
    Based on the natural boundary element theory of curved edge finite element,a D-N alternating method with curved edge finite element is established to solve anisotropic elliptic exterior problem in the infinite domain with a concave angle,and to give the error estimation and convergence of the approximate solution of the D-N alternating method.
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    Estimations of a Ros Deficit
    GUO Ruyi, MEI Jingfang
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (3): 8-12.   DOI: 10.13438/j.cnki.jdzk.2023.03.002
    Abstract218)      PDF(pc) (279KB)(147)       Save
    The upper and lower bounds of a Ros deficit are obtained with the geometric quantities such as the area of the involute line and Wigner caustics of the plane strictly closed convex curve  Γ.
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    Antibacterial Activity and Identification of Endophytic Fungi YDZ-8 Isolated from Lavandula angustifolia Mill.
    CHEN Tianyi, BAIDOULA·Nulan, TUERDEBIEKE·Mayila, ENTOMACKY·Borrathyba
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (2): 47-51.   DOI: 10.13438/j.cnki.jdzk.2023.02.007
    Abstract284)      PDF(pc) (2024KB)(146)       Save
    The endophytic fungi were isolated from the roots of Lavandula angustifolia Mill. by surface disinfection method and tissue isolation method,and the antibacterial activity against the Staphylococcus aureus was evaluated by paper disk diffusion method.The active isolates were identified in terms of  their morphological features by phylogenetic analysis based on ITS sequence of rDNA gene.The results showed that the endophytic fungi of YDZ-8 had remarkable antibacterial activity against Staphylococcus aureus strain CGMCC1.872.Fungal morphological and molecular identification demonstrated that the endophytic fungi strain YDZ-8 represented Trichoderma harzianum.
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    Research on the Effect Evaluation of Integrating Revolutionary Culture into Tourism Management Graduate Education based on Entropy-Fuzzy Comprehensive Evaluation Method
    WANG Zhaofeng, WU Yinfeng
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (4): 83-90.   DOI: 10.13438/j.cnki.jdzk.2023.04.010
    Abstract215)      PDF(pc) (700KB)(145)       Save
    Taking tourism management graduate students of colleges and universities as the research object,this research uses entropy method and fuzzy comprehensive evaluation method to evaluate the effect of integrating revolutionary culture into tourism management graduate education.The results showed that 25.89% of the teachers and students think the effect  is very good,41.92% of the teachers and students think the effect is good,32.19% of the teachers and students think the effect is not good.Therefore,to improve  the effect of integrating revolutionary culture into tourism management graduate education,it is necessary to optimize the tourism management graduate student education program,incorporate revolutionary culture into coursebook,class,and ideology,innovate and optimizate tourism management graduate student education content and form,and promote  the "three whole education" system.At the same time,it is necessary to strengthen the construction of tourism management disciplines and professional teachers to promote the high-quality development of tourism management personnel training.
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    A Novel MEHM Blind Spectrum Sensing Algorithm Based on Random Matrix Theory
    LIU Tingting, LEI Kejun, TAN Zhewen, TIAN Chong, TIAN Xinxin, YANG Xi
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (2): 33-38.   DOI: 10.13438/j.cnki.jdzk.2023.02.005
    Abstract365)      PDF(pc) (934KB)(141)       Save
    A novel maximum eigenvalue-harmonic mean (NMEHM) blind spectrum sensing algorithm is proposed,using the results of the distribution of the limiting eigenvalues of the sample covariance matrix in random matrix theory.The proposed algorithm significantly improves the detection performance of the traditional MEHM algorithm and achieves better detection performance than the classical eigenvalues-based detection algorithms;at the same time,the proposed algorithm does not require a priori knowledge of the primary user signal and wireless channel,which can availably overcome the effect of noise uncertainty.Simulation results demonstrate the validity of the proposed algorithm.
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    Optimal Multiband Collaborative Spectrum Sensing Algorithm Based on Constrained PSO Algorithm
    TIAN Chong, LIU Tingting, TAN Zhewen, TAN Yuhao, LEI Kejun, YANG Xi
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (3): 34-38.   DOI: 10.13438/j.cnki.jdzk.2023.03.005
    Abstract263)      PDF(pc) (454KB)(141)       Save
    For the difficulties in controlling the total interference of the system with unconstrained PSO algorithm,an optimal multiband cooperative spectrum sensing method based on constrained Particle Swarm Optimization (PSO) algorithm is proposed.This algorithm transforms the constrained optimization problem into an unconstrained optimization problem by introducing a penalty function.Compared with the traditional solutions based on unconstrained PSO algorithm,the proposed constrained PSO algorithm can effectively solve the constrained multiband cooperative spectrum sensing optimization problem,and the optimal solution meets the constraints to avoid excessive total interference.
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    Multi-Attribute Group Decision Making Algorithm of Weighted Hesitant Fuzzy Set and Its Application
    ZHU Guocheng
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (4): 9-18.   DOI: 10.13438/j.cnki.jdzk.2023.04.002
    Abstract229)      PDF(pc) (436KB)(134)       Save
    In order to describe the multi-attribute group decision information of hesitant fuzzy set more comprehensively,the weighted hesitant fuzzy set is defined by adding the associated comprehensive weight of decision expert to the membership degree of hesitant fuzzy set.On the basis of using weighted hesitant fuzzy set to describe decision information,two algorithms for sorting alternative solutions based on single attribute view are established.Finally,the feasibility of the two algorithms are verified by a concrete case.The results show that the two algorithms are easy to operate and calculate,and can be converted into each other.
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    A Survey on Employment of Statistics Graduates from Universities in Western Regions
    CHEN Wangxue, PAN Hao
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (3): 87-90.   DOI: 10.13438/j.cnki.jdzk.2023.03.013
    Abstract222)      PDF(pc) (830KB)(125)       Save
    Taking the employment data of statistics graduates of Jishou University from 2015 to 2019 as a case,this paper analyzes the employment of graduates from three aspects of employment industry,employment position and employment region.The results indicate that the employment situation for statistics graduates is optimistic,characterized by multiple choices in employment industries and strong professionalism in employment positions.Based on the current employment status,some suggestions are put forward to improve the employment competitiveness of statistics graduates.
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    Reachable Set Estimation for Generalized Semi-Markov Jump Systems
    PENG Chunyuan, SHEN Changchun
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (2): 17-23.   DOI: 10.13438/j.cnki.jdzk.2023.02.003
    Abstract332)      PDF(pc) (400KB)(124)       Save
    Based on Lyapunov functional method,the reachable set boundary estimation problem for a class of singular semi-Markovi jump systems with time-varying delays is studied.Firstly,the boundary of the fast and slow subsystem is obtained by the piecewise analysis method and integral inequality technique.Then,the upper and lower boundary of semi-Markov transfer rate is used to deal with the problem of abnormal transfer rate.Finally,the sufficient condition of the existence of the reachable set boundary of the system is given in the form of linear matrix inequality.
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    Reachable Set Boundary Estimation for Neutral Markovian Jump Systems
    ZHANG Xipan, SHEN Changchun
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (2): 7-16.   DOI: 10.13438/j.cnki.jdzk.2023.02.002
    Abstract302)      PDF(pc) (2757KB)(123)       Save
    By constructing an appropriate Lyapunov functional and using the improved Wirtinger integral inequality combined with the free-weighting matrix idea and the time-delay segmentation method,we have obtained the boundary conditions for the small reachable set of a class of neutrual Markovian jump systems (NMJSs) with distributed delay  in the form of linear matrix inequalities.
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    Shock Absorption Effect of Shock Absorbing Layer Settings of Urban Utility Tunnel
    CUI Guangyao, KE Xu, GUO Yanjun
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (2): 39-46.   DOI: 10.13438/j.cnki.jdzk.2023.02.006
    Abstract351)      PDF(pc) (6591KB)(120)       Save
    To improve the seismic resistance behavior of the soft-stratum of urban utility tunnel in strong earthquake areas,this paper takes the utility tunnel as the research object and studies,the shock absorption effect of the shock absorbing layer with different settings through finite difference software FLACD.The results show that compared with the condition without seismic measures,the maximum settlement of the condition with the bedding shock absorbing layer decreases by 1.61%,the maximum and minimum principal stresses decrease by 29.75% and 4.88% respectively,the maximum shear stress decreases by 18.49% and the minimum safety factor increases by 15.13%;the maximum settlement of the condition with setting a semi-ring shock absorbing layer decreases by 1.55%,the maximum and minimum principal stresses decrease by 34.12% and 18.06% respectively,the maximum shear stress decreases by 31.86% and the minimum safety factor increases by 18.33%;the maximum settlement of setting a full-ring shock absorbing layer decreases by 16.92%,the maximum and minimum principal stresses decrease by 61.04% and 28.84% respectively,the maximum shear stress decreases by 35.78% and the minimum safety factor increases by 32.46%.It can be concluded that the shock absorption effect of setting a full-ring shock absorbing layer is better than the cushion layer and the semi-ring layer.
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    Construction and Properties of Two-Level Optimal Column Augmented Designs
    ZHANG Shixian, TIAN Jiezhong, BAI Qiming, LI Hongyi
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (3): 1-7.   DOI: 10.13438/j.cnki.jdzk.2023.03.001
    Abstract201)      PDF(pc) (334KB)(118)       Save
    In order to construct augmented designs more flexibly,the author uses a method without computer search which begins with an initial design with less number of columns and transforms by some rules to construct two-level optimal column augmented designs.In addition,the relationship between the column augmented designs and their initial designs is discussed under the E(s) criterion,the generalized minimum aberration criterion and the minimum moment aberration criterion.
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    Analysis of Mechanical Properties of Cast-in-Place Prestressed Concrete Curved Box Girder
    WANG Jianxing, WANG Xinjie
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (4): 39-46.   DOI: 10.13438/j.cnki.jdzk.2023.04.005
    Abstract216)      PDF(pc) (2747KB)(118)       Save
    To analyse the mechanical properties of cast-in-place prestressed concrete curvilinear box girder under load,this paper took the actual project as the background,with the establishment of finite element model of curvilinear box girders,analyzed the mechanical characteristics and deformation law of the structure under different loads,and summarized the corresponding characteristics.Through the finite element analysis of the cast-in-place prestressed concrete curved box girder,the results show that there is a big difference between the arc lengths of the inner and outer sides of curved box girder,and the stress of the inner and outer sides of the same section of box girder is different;the stress produced when the same load is applied to the outer side is greater than that produced when it is applied to the inner side;under the vertical normal load of curved box girder,the longitudinal stress of mid-span section is less than that of side-span section;the vertical bending of the bridge is accompanied by the transverse torque,but the vertical bending value is far greater than the transverse torque value.
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    Existence of Positive Solutions to Two-Point Boundary Value Problems of Fractional Differentional Equations Involving Caputo-Fabrizio Fractional Derivatives
    WANG Lanfang
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (5): 1-5.   DOI: 10.13438/j.cnki.jdzk.2023.05.001
    Abstract132)      PDF(pc) (279KB)(116)       Save
    Based on the Krasnoselskii fixed point theorem,existence of positive solutions to two-point boundary value problems for fractional differential equations involving the Caputo-Fabrizio derivative is discussed,and some sufficient conditions are established to ensure the existence of at least one positive solutions to the boundary problem.
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    Difficulties and Countermeasures of Blockchain Technology Application in Sports Industry
    KE Yangning
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (3): 91-96.   DOI: 10.13438/j.cnki.jdzk.2023.03.014
    Abstract261)      PDF(pc) (457KB)(113)       Save
    The application of blockchain technology in sports industry can promote decentralization,build trust mechanism,realize data value,strengthen property protection,and make sports industry a new source of power to promote high-quality economic development.However,the development of "blockchain + sports industry" is faced with such practical difficulties as prominent bottleneck of blockchain technology application,lack of compound talents,insufficiency of regulatory means,and application to be expanded.From improving the top-level design,increasing R & D investment,innovating regulatory technology,and strengthening personnel training,effective countermeasures are put forward for blockchain technology to drive the innovation and development of China's sports industry,so as to help the healthy and efficient development of "blockchain + sports industry".
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    Binocular Stereo Matching Algorithm Based on Improved Census Transform
    AN Geng, YANG Fenlin, ZHOU Mengyuan, DOU Xinrui
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (3): 29-33.   DOI: 10.13438/j.cnki.jdzk.2023.03.004
    Abstract308)      PDF(pc) (3514KB)(108)       Save
    For the problem that the gray value of the center point of the traditional Census transform window is easily affected by noise and the global matching accuracy is low,a binocular stereo matching algorithm based on improved Census transform is proposed.First,the template value of bilateral filtering is used to replace the gray value of the center point of the Census transform window.In order to enhance the reliability of the initial cost calculation,Sobel operator and the absolute error of gray level and the matching cost of the algorithm are added for cost fusion.Then the dynamic cross region is selected to establish the relationship between adjacent parallaxes.Finally,the winner-take-all strategy is used to select the best disparity,and left and right consistency detection and guided filtering are used to optimize the disparity map.The experimental results show that compared with the traditional Census transform,the average mismatch rate of the algorithm is reduced by about 46% in the noiseless case and 53% in the noisy case.It is concluded that the improved algorithm has better accuracy and anti-noise ability.
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    Synthesis of Dimethyl Carbonate by Electroreduction of Carbon Dioxide in Acetonitrile on Graphene-Silver Electrode
    KUANG Yongbin, YU Xi, YANG Miao, FENG Qiuju
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (4): 69-74.   DOI: 10.13438/j.cnki.jdzk.2023.04.008
    Abstract236)      PDF(pc) (10274KB)(108)       Save
    In this paper,the improved Hummers method was used to prepare graphene oxide (GO).Electrochemical deposition method was used to deposit graphene and silver on conductive glass at room temperature and pressure to prepare graphene-silver composites.Dimethyl carbonate (DMC) was synthesized by electrochemical reduction of carbon dioxide combined with methanol (CH3OH) and iodide methane (CH3I) in acetonitrile solution with graphene-silver electrode as cathode.On this basis,the effects of different GO volumes,dispersant types and concentrations on the morphology of graphene-silver composites were discussed,and the effects of different electrolytic time on the DMC yield were also discussed.The results showed that the graphene-silver composites had good morphology when the GO volume was 10 mL,dispersant was PVP and dispersant concentration was 0.5 mol/L.When the electrolytic potential was -2.0 V,the temperature was 25 ℃,the supporting salt concentration was 0.1 mol/L,and the electrolytic time was 10 h,the yield of DMC was 36.8%,which was the best experimental conditions.
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    Diversity of Wild Medicinal Plant Resources and Correlation Analysis of Medicinal Material Properties in Dehang Scenic Spot of Hunan Province,China
    TAN Lu, XIANG Xiaomei, LIU Bing, WANG Zhicheng, CHEN Gongxi
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (2): 87-95.   DOI: 10.13438/j.cnki.jdzk.2023.02.011
    Abstract183)      PDF(pc) (555KB)(103)       Save
    Correlation between medicinal material properties and diversity of wild medicinal plant resources in Dehang scenic spot was analyzed.The species composition,the life forms,the geographical distribution and the medicinal parts were statistically analyzed by field investigation,specimen arrangement and literature review.On this basis,association rule method was used to analyze the correlation between medicinal plant family and genus,medicinal chemical composition and medicinal efficacy.The results show that there are 617 species of wild medicinal plants belonging to 406 genera and 137 families in Dehang scenic spot.The life forms are mainly herb.As for the floristic geographical distribution at the family level,the medicinal plant flora is mainly global and pan-tropical;at the genus level,the medicinal plant flora is mainly north temperate and pan-tropical;and at the species level,the medicinal plant flora is mainly East Asia.The medicinal parts are mainly the whole plant,roots and rhizomes.A total of 36 strong association rules were screened by association rule analysis,among which liliaceae-saponins,zanthoxylum-alkaloids are highly correlated in terms of chemical components,and Liliaceae-expectorant cough suppressant and anti-asthmatic drug,and Hypericum-styptic are highly correlated in terms of medicinal efficacy.The results show that species of the medicinal plants are rich in Dehang scenic spot and their life forms are diverse.The floristic geographical composition is complex.According to the correlation between medicinal plant family,chemical composition and efficacy,it can be concluded that new drugs with better efficacy and less toxicity can be found in nature.
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    Experimental Study on Flexural Behavior of Finger-Jointed Timber Beams Strengthened with CFRP Sheets
    WANG Jianxing, JIA Yumeng, XUE Meihui
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (3): 39-45.   DOI: 10.13438/j.cnki.jdzk.2023.03.006
    Abstract192)      PDF(pc) (2171KB)(103)       Save
    In order to improve the flexural strength of finger-jointed timber beams,three groups of timber beams were designed and manufactured.Through four-point compression test,the flexural performance of solid timber beams,finger-jointed timber beams and CFRP reinforced finger-joint beams were compared,and the influence of finger-jointed joints on the fracture mode of timber beams was analyzed.The displacement load curve of finger-jointed timber beams and the displacement load curve of finger-jointed timber beams were obtained,and the corresponding distinction was given for the failure characteristics of each type.Therefore,the feasibility of using CFRP to reinforce finger-joint is proposed.The test results show that the appearance of finger-joint has obvious influence on the bending failure process of timber.The appearance of finger-joint makes the fracture mode of timber change from ductile fracture to brittle fracture,and the flexural strength of finger-joint timber beam is significantly improved by using CFRP cloth reinforcement.
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    Investigation and Research on Wild Edible Plant Resources in the Mountaintop Platform of Zhangjiajie Tianmenshan National Forest Park,Hunan Province
    LI Yuxuan, JIN Jia, HU Jian, CHEN Gongxi, XIANG Xiaomei
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (3): 46-53.   DOI: 10.13438/j.cnki.jdzk.2023.03.007
    Abstract215)      PDF(pc) (744KB)(102)       Save
    In order to understand the current situation of wild edible plant resources in the mountaintop platform of Tianmenshan National Forest Park in Zhangjiajie,the wild edible resources in this area were statistically analyzed by field investigation,specimen collection and literature review.The results showed that there were 134 species of wild edible plants belonging to 102 genera and 49 families in the Mountaintop platform of Tianmenshan.Among them,Rosaceae,Compositae and Lily were the dominant families,and Rubus was the dominant genus.Herbs were the main life forms.The geographical composition of species is complex and diverse,with the largest proportion of endemic species in China.The edible category is mainly wild vegetables,and the nutritional value is the largest proportion of fiber.The edible part is mainly leaves,and the cooking method is mainly frying.The edible plant resources on the mountaintop platform of Tianmenshan are rich in species,diverse in cooking methods,and high in nutritional value.
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    Resistance to Kiwifruit Bacterial Canker and Its Correlation with Sugar Content in Branches of Kiwifruit Varieties
    GAO Jianyou, KUANG Meimei, LUO Qin, TAN Zecheng, CUI Lihong, ZHA Manrong, LIU Shibiao
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (3): 66-72.   DOI: 10.13438/j.cnki.jdzk.2023.03.010
    Abstract180)      PDF(pc) (909KB)(98)       Save
    In the present experiment,the resistance identification and evaluation of total 13 kiwifruit cultivars in Actinidia chinensis and A. chinensis var. deliciosa to Pseudomonas syringae pv. actinidiae (Psa) was conducted indoors by using wounding method on detached branches.The results showed that the incidence rate,onset time and lesion length of the isolated branches in all tested materials were significantly different after pathogenic bacteria inoculation.The order of resistance of the above cultivars was listed as follows:Miliang-1>Miliang-2>Chuhong>Cuiyu>Beimu>Xiangbiyu>Xiangji>Xiangjihong>Wuzhi-3>Jinyan>Donghong>Guichang>Hongyang,according to the disease lesion length from small to large,at the 25 d after infected Psa.A. chinensis var. deliciosa Miliang-1 was evaluated as the high resistance (HR) cultivar and A. chinensis Hongyang as the high susceptibility (HS) cultivar.The content of soluble sugar in branches decreased significantly after infected Psa,and the higher of the soluble sugar content after infection,the stronger resistance the cultivar had.However,no correlation was observed between the Psa resistance and reducing sugar content,lenticels characters and cortex thickness,respectively.
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    Identification  of Cellulose Degrading Bacteria in Namco Yak Dung and Its Enzyme Production Characteristics
    LI Qiang, LUO Jin, YANG Jianing, GAO Hongtao, LIU Xuan, HE Jianwu
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (3): 61-65.   DOI: 10.13438/j.cnki.jdzk.2023.03.009
    Abstract164)      PDF(pc) (2328KB)(94)       Save
    Through enrichment and purification,high efficient cellulose degrading strains were screened from yak dung in Namco Lake,Tibet.The enzyme production characteristics of cellulose degrading strains under different conditions were determined,and the genetic differences of the target strains were analyzed.The results showed that strain X1 and X2 had significant cellulose degradation advantage,and the relative enzyme activities of the two strains were strong at pH 4 and 9 ℃.Phylogenetic analysis showed that X1 and X2 might belong to the genus Cronobacter.
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    Stability of Three-Dimensional Cracked Slopes Reinforced by Anti-Slip Piles
    SHENG Yan, LI Jia
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (4): 47-54.   DOI: 10.13438/j.cnki.jdzk.2023.04.006
    Abstract194)      PDF(pc) (1272KB)(94)       Save
    Cracks are a common disease affecting slope stability,in engineering,anti-slip piles are often used to reinforce the slopes for improvement of the stability of cracked slopes.A three-dimensional cracked slope rotational failure mechanism with anti-slip pile reinforcement is constructed in this paper,and the power expression of anti-slip pile lateral resistance is derived based on the assumption of the plastic state of soil between piles,and the safety factor of three-dimensional cracked slopes with different reinforcement locations and reinforcement density of anti-slip piles is calculated.Parametric studies imply that the anti-slip pile reinforcement measures can effectively reduce the maximum depth of cracks and significantly improves the stability of the slope.There is a significant negative correlation between the safety coefficient of cracked slopes and the maximum depth of cracks,which can be used as an effective indicator to determine the sensitivity of slopes to natural cracks.As the position of anti-slip piles moves from the slope toe to the slope crest,the safety factor of slopes first increases and then decreases,showing a significant unimodal behavior.
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    Effect of Plant Rodenticides on the Reproduction Performance of Female Microtus fortis
    YANG Dongmei, ZENG Sichun, TAO Shuanglun, LI Anna, LI Jiacheng, HE Qian, LI Shuang, LI Junnian
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (2): 58-63.   DOI: 10.13438/j.cnki.jdzk.2023.02.009
    Abstract266)      PDF(pc) (595KB)(93)       Save
    To measure the effects of plant rodenticide on reproductive performance of Microtus fortis,the effects of plant rodenticide on serum estrogen,reproductive organ index,litter size and reproductive delay of Microtus fortis were studied by one-time gavage in laboratory.The results showed that different doses of plant rodenticide significantly increased the uterine index and changed the uterine morphology of M. fortis,but did not affect the level of serum estradiol and uterine length.The serum follicle-stimulating hormone (FSH) content and ovarian index of female voles gavaged 50 mg/kg rodenticide were significantly increased.It is showed that different doses of plant rodenticide could delay the time of first reproduction and litter size of female M. fortis,and the recovery time of reproduction in female M. fortis gavaged 10 mg/kg,25 mg/kg and 50 mg/kg groups was 11 d,22 d and 48 d longer than that of the control group,respectively.
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    Effect of Diammonium Glycyrrhizinate on Apoptosis in Rats with Ulcerative Colitis
    SHENG Yihua, ZHOU Minggao, FAN Taiping, TAN Xiaowen, ZENG Xingyao, LI Ping, LI Sidi
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (2): 52-57.   DOI: 10.13438/j.cnki.jdzk.2023.02.008
    Abstract325)      PDF(pc) (466KB)(90)       Save
    To explore the effect of diammonium glycyrrhizinate on apoptosis of peripheral blood inflammatory cells in rats with ulcerative colitis.UC model was induced by TNBS and ethanol,both with colonic mucosa tissue,which were assigned into four groups,namely control group,model group,western medicine group (administrated by sulfasalazine enteric-coated tablets),and licorice group (administrated by diammonium glycyrrhizinate).Pathomorphological changes of colon tissue were dynamically observed in the 0,2nd,and 4th week after model establishment,and the apoptosis rates of LPL and PMN in the blood were dynamically observed by flow cytometry in the 2nd and 4th week respectively.Compared with the control group,pathological changes in colon tissue were showed in model group by HE staining,and the colon wet weight and the colon weight index increased.Compared with the model group,the pathological changes of colon tissue in DG group and western medicine group were recovered in a certain degree in the 2nd and 4th week.The colon wet weight and colon weight index decreased significantly in DG group in the 4th week.Apoptosis of LPL and PMN in blood of UC model was delayed in the 2nd week after model established,while DG and western medicine promoted poptosis of LPL and PMN.In the 4th week,apoptosis rate of LPL in UC model still decreased,but apoptosis rate of LPL in DG and western medicine group was higher than that of model group.It can be concluded that DG and sulfasalazine enteric coated tablets can still improve the apoptosis rate of LPL.Occurrence and development of ulcerative colitis is related with apoptosis reduction of LPL and PMN to some degree.DG can relieve UC  through regulating apoptosis rate of LPL and PMN in blood.
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    Secure Top-k Query Scheme with Strong Privacy Protection in Cloud Computing Environment
    CUI Shaogang, YIN Hui, ZHOU Chunguang
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (3): 13-28.   DOI: 10.13438/j.cnki.jdzk.2023.03.003
    Abstract190)      PDF(pc) (1800KB)(84)       Save
    In a multi-user application scenario,the cloud can collude with a data owner or a data user to infer an authorized user's query contents.In this paper,we first present the collusion attack model in cloud environments and implement an efficient and strongly privacy protective search scheme.This scheme employs dynamical and secure searchable index construction which not only guarantees the data confidentiality but also extremely fits into the multi-user cloud computing environments where data files are dynamically uploaded frequently,enhancing the availability and scalability of the whole system greatly as well.In addition,in order to satisfy users' individual search requirements,our scheme supports secure relevance ranking for query results according to keyword weight,thus implementing secure top-k query.
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    Named Entity Recognition of Diabetes Online Health Community Based on BERT Model
    LIANG Yujin, FU Chuanshan, CHEN Jinsong, CHEN Ming, ZHOU Yue, XU Qian
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (5): 28-34.   DOI: 10.13438/j.cnki.jdzk.2023.05.004
    Abstract120)      PDF(pc) (840KB)(84)       Save
    To address the issues of heterogeneous content,high complexity,and inability to recognize contextual semantics in diabetic patient-patient online health communities,the BERT-embedded BiLSTM-CRF model is used to recognize six types of entities from the text of the diabetic community "Sweet Home":disease,clinical manifestation,medicine,test,body parts,and emotion.The results demonstrate that the model achieved an accuracy rate of 90.8%,a recall rate of 76%,and a F1 value of 82.8%.The BERT-BiLSTM-CRF model has been shown to be useful for recognition and to serve as a benchmark for more personalized health information and services.
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    Tunable Dual-Frequency Perfect Absorber with Graphene
    ZHAO Jinyun, SHAN Xinyu, GAO Guangbo, HUANG Yonggang
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (6): 37-43.   DOI: 10.13438/j.cnki.jdzk.2023.06.007
    Abstract73)      PDF(pc) (3283KB)(82)       Save
    A tunable dual-frequency perfect absorber consisting of a graphene resonator,a SiOdielectric layer and a metal reflector layer has been designed by utilizing the excellent tunable optical properties of graphene.The effects of graphene chemical potential,polarization angle and size on the absorber absorption performance were systematically investigated,and the electric field pattern at the resonance frequency was analyzed to further explain the principle of absorber absorption.The results show that the absorber has an absorption rate of 99.98% and 99.99% at 6.363 and 8.987,respectively.The absorption peak position of the absorber can be effectively adjusted by changing the chemical potential of graphene,and the peak absorption rate can reach more than the peak absorption rate at any polarization angle in the range of 0°~80°.The thickness of the SiO2 dielectric layer has almost no effect on the resonance peak position of this absorber,but it has some effect on the peak absorption rate,which increases and then decreases with the gradual increase of the thickness,and perfect absorption is achieved near the thickness of 3.1 μm.The high absorption rate of this absorber stems mainly from the electromagnetic resonance effect.
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    Manipulation of the Band Structure of Weyl Semimetals by Electric and Magnetic Fields
    LUO Shuzhen, LIAO Wenhu, BAO Hairui
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (6): 80-89.   DOI: 10.13438/j.cnki.jdzk.2023.06.013
    Abstract85)      PDF(pc) (3303KB)(80)       Save
    Based on the low-energy effective hamiltonian model under the tight-binding approximation,the modulation of the electronic band structure of weyl semimetals by applied electric and/or magnetic fields is investigated.The results show that:when only the positive (negative) electric field is applied,the weyl points of system gradually move towards the boundary (center) of the brillouin zone with the increasing of the electric field strength,and when the electric field strength increases to a certain extent,the semimetal-semiconductor (insulator) transition can be relieazed;when only the magnetic field is applied,the weyl semimetal can form the discrete landau levels,the n=0 subband does not change with the increasing of magnetic length while the n≠0 subband gradually approaches the fermi level with the increasing of magnetic length,and the band gap between the conduction and valence bands with same indices gradually decrease;when the magnetic length remains unchanged,the weyl points of system gradually move towards the boundary (center) of the brillouin zone with the increasing of the positive (negative) electric field strength.Under the appropriate electric field,the n=0 subband can change from partially occupied valence band to first conduction band (fully occupied first valence band) and realize the semimetal-semiconductor or semimetal-insulator transitions.
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    Pollution Characteristics and Pollution Sources Analysis of SO2,Oand NO2 in Hefei High-Tech Zone
    ZHENG Nina, XU Yaqi, PAN Lingyang
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (3): 54-60.   DOI: 10.13438/j.cnki.jdzk.2023.03.008
    Abstract167)      PDF(pc) (4478KB)(80)       Save
    In this paper,the atmospheric SO2,O3 and NO2 of Hefei High-tech Zone are continuously observed using long-path differential absorption spectroscopy system,and the characteristics of gas pollution and possible pollution sources are analyzed.The diurnal variation shows that SO2 is high at night and low during the day.The diurnal variation of NO2 shows a single peak and single valley type.The rush hour of off-duty traffic has certain effect on NO2.But the whole day concentration of NO2 is on the high side (35~45 μg/m) and the variation is small,so there exist  other important nitrogen oxide emission sources.The diurnal variation of O3 is obvious.Its daytime concentration is high,and the maximum value appears at 16:00 in the afternoon;the concentration is low at night,and the lowest value appears on the early morning.The concentration of NO2 and SO2 in winter is high because of low atmospheric boundary layer.In summer,photolysis reaction is intense,wet deposition is obvious,so the concentration of pollutants is low.On the contrary,the seasonal variation of O3 is contrary.The analysis of pollution sources shows that the high SO2 value is mainly related to the coal burning of rural residents in the northwest of the observation site and the unorganized emission of pharmaceutical companies and paint factories in the southeast of the observation site.However,the high value of NO2 in the east-northeast (wind speed > 6 m/s) wind direction is affected by the long-distance transmission from Hefei Wanneng Power Plant and vehicle exhaust emissions in busy urban areas.The wind speed and direction distribution of O3 and NO2are basically opposite.The correlation coefficient of NO2 and O3 is only -0.429 6.There are other important O3 precursor pollutants in the atmosphere of Hefei Hi-tech Zone.
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    Multi-Channel Cooperative Routing Cross-Layer Control System of Communication Network Based on IPv6
    LI Miao
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (5): 35-41.   DOI: 10.13438/j.cnki.jdzk.2023.05.005
    Abstract147)      PDF(pc) (949KB)(79)       Save
    A multi-channel collaborative routing cross layer control system (referred to as the cross layer control system) for power communication networks based on IPv6 is designed to address issues such as transmission delay and channel collision caused by limited IP allocation.The hardware part of the system uses IPv6 technology to establish a communication protocol stack,and uses communication network collaboration routing to achieve cross layer control of devices such as databases,processors,and controllers in the system.The software uses the information generated by the protocol stack to build a routing control system,and uses multiple ant colony optimization algorithms to find the optimal communication path for multi-channel cooperation in the power communication network,achieving cross layer control of multi-channel cooperation routing in the power communication network.Selecting information transmission delay,channel node collision rate,and throughput as evaluation criteria,a comparative experiment was conducted between the multiple ant colony cross layer control algorithm,ant colony algorithm,and Newton algorithm.The results showed that the delay of the multiple ant colony cross layer control algorithm was maintained at around 0.03 seconds.When the number of tasks was less than 100,there was no node collision phenomenon,and the throughput was higher than 520 MB/s.This indicates that the cross layer control system has better routing cross layer control effect.
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    Spontaneous Radiation Dynamics of Three-Level Atoms Near Silver Nanospheres
    LI Yun, GAO Guangbo, SHAN Xinyu, HUANG Yonggang
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (6): 50-58.   DOI: 10.13438/j.cnki.jdzk.2023.06.009
    Abstract66)      PDF(pc) (2238KB)(76)       Save
    Based on the method of Green's function presolvation operator,the spontaneous radiation dynamics of V-type three-level atoms near silver nanospheres are studied.The effects of atomic transition frequency and atomic distance on the surface of the nanosphere on the spontaneous radiation dynamics are investigated systematically.The results show that when the transition frequency of the atom is far away from the resonant frequency of the isoplasmon,the evolution spectrum of the atom is half high and narrow,the dynamic oscillation is enhanced,and the decay rate is slow with time.When the two transition frequencies are close to the formant frequency,the kinetic oscillation of the atom is weakened,and the attenuation rate is faster with time.The distance between the atom and the surface of the nanosphere plays an important role in the coherent oscillation.The closer the distance,the stronger the coherent oscillation;and the farther the distance,the weaker the coherent oscillation.
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    Anti-COVID-19 Pandemic Effect of Plant Flavonoids: Use of Green Tea Flavonoids
    Deyu Xie, Seyit Yuzuak, Yue Zhu, Qingzhong Peng
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (2): 64-86.   DOI: A10.13438/j.cnki.jdzk.2023.02.010
    Abstract215)      PDF(pc) (15443KB)(76)       Save
    In 2020,we reported that flavan-3-ol gallates (F3Gs),dimeric proanthocyanidins (PAs),and F3Gs and PA-rich extracts of green tea inhibited the activity of the main protease of SARS-CoV-2.Recently,we reported that F3Gs and other flavonoids inhibited the replication of human coronavirus 229E in human cells.In addition,a large number of articles reported the beneficial effects of green tea and flavonoids on the therapy of COVID-19.Since December 2020,we have continued to use demographic and ethno-pharmaceutical approaches to investigate the use of green tea during the recovery of COVID-19 volunteers in USA and Turkey.We collected data from more than 23 people who used green tea during their recovery at home in USA and five consented to report their recovery experience.We collected detailed recovery information from 100 volunteers (from 20-month to 96 years old) in Turkey,who only used green tea for their recovery without any medical assistance.A pearson correlation coefficient (PCC) analysis indicated a negative correlation between the recovery days and the daily green tea cups consumed by those Turkish volunteers.The more cups of tea they drank,the fewer days they needed for their recovery.Furthermore,the data of the annual per capita tea consumption (PCTC) were obtained from 208 and 100 countries in 2020 and 2021,respectively.Turkey had the highest PCTC values,3.0 and 3.4 kg in 2020 and 2021 and their COVID-19 death rates were lower than 1%.People in many countries of Latin America did not drink tea,while the death rates were relatively high.For example,Mexico had the highest death rate in 2020,about 11%.Furthermore,the average death rates of COVID-19 were calculated for 115 and 121 countries in 2020 and 93 countries in 2021.PCC analysis indicated a promising negative association between PCTC and death rates in these countries.The more tea infusions were consumed,the lower the death rates of COVID-19 occurred.These data indicate that the valuable benefit of tea especially green tea to help the recovery from COVID-19 and reduce death (All data were approved for publication by the institutional review board (IRB),the Ethic Commission for Un-Interventional Clinical Studies,and volunteers).
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