Journal of Jishou University(Natural Sciences Edition)

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.

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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.

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.

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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.

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.

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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.

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.

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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.

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.

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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.

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.

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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.

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.

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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.

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.

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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.

Research on Regional Sign Design for City Entrances：Design of Anren City Gate

SONG Lixin, MA Ruoxuan, SHI Dan, SONG Zikun, XIE Juntao

Journal of Jishou University(Natural Sciences Edition), 2023, 44(4): 75-82.

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With the semiotic principles,this paper proposes a new way of regional sign design to reduce the difficulty in understanding signs and show uniqueness.Based on the survey of regional cultural symbols,the symbols are summarised into common,easily recognisable and simple draft figures.Familiar figures are derived into new signs with regional cultural characteristics and unique elements.Finally,with theoretical exploration,the research enjoys a practical design exploration of the Anren city gate and project implementation.

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.

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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.

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.

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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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