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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
    Abstract268)      PDF(pc) (1054KB)(178)       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
    Abstract244)      PDF(pc) (3959KB)(176)       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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    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
    Abstract232)      PDF(pc) (2738KB)(172)       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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    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
    Abstract265)      PDF(pc) (10002KB)(171)       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
    Abstract212)      PDF(pc) (374KB)(162)       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
    Abstract231)      PDF(pc) (279KB)(155)       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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    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
    Abstract275)      PDF(pc) (454KB)(150)       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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    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
    Abstract235)      PDF(pc) (700KB)(150)       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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    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
    Abstract245)      PDF(pc) (436KB)(140)       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
    Abstract236)      PDF(pc) (830KB)(133)       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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    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
    Abstract214)      PDF(pc) (334KB)(130)       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
    Abstract229)      PDF(pc) (2747KB)(123)       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
    Abstract141)      PDF(pc) (279KB)(122)       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
    Abstract285)      PDF(pc) (457KB)(117)       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
    Abstract319)      PDF(pc) (3514KB)(116)       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
    Abstract251)      PDF(pc) (10274KB)(115)       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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    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
    Abstract88)      PDF(pc) (3283KB)(115)       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
    Abstract107)      PDF(pc) (3303KB)(114)       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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    Design of Ultrathin Transmissive Acoustic Cloak
    SUI Yumei, KONG Peng, DENG Ke, ZHAO Heping
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (6): 32-36.   DOI: 10.13438/j.cnki.jdzk.2023.06.006
    Abstract88)      PDF(pc) (2319KB)(114)       Save
    Acoustically transmissive cloak is constructed with a combination of two labyrinthine type metasurfaces-phase-modulated metasurface and near-zero refractive index metasurface.The near-zero refractive index metasurface is verified by energy band calculation and equivalent medium theory to have zero refractive index property similar to phonon crystals,so that it can guide the acoustic waves to continue to go around the obstacles in the original direction of the acoustic waves;the phase-modulated metasurface,on the other hand,should have a high transmittance while having the role of phase-modulation to ensure that the acoustic waves can pass through in large quantities.The simulations and calculations show that the acoustic transmission cloak formed by the construction works well.
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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
    Abstract244)      PDF(pc) (744KB)(112)       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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    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
    Abstract80)      PDF(pc) (2238KB)(111)       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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    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
    Abstract201)      PDF(pc) (2171KB)(108)       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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    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
    Abstract201)      PDF(pc) (909KB)(108)       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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    Spontaneous Emission of Atoms in Double-Column Structure Based on Quasi-Normal Mode Theory
    CHEN Xuanren, SHAN Xinyu, YANG Hong
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (6): 67-74.   DOI: 10.13438/j.cnki.jdzk.2023.06.011
    Abstract90)      PDF(pc) (1458KB)(106)       Save
    Based on the quasi-normal mode (QNM) theory,in the local photoresponse model,fluid dynamics model and generalized non-local photoresponse model of free electrons in metals,the spontaneous emission enhancement characteristics of two-level atoms in the nano-column structure are studied.With efficient coupled QNM theory,the effects of quantum dot position and double-column gap distance on the enhancement properties of spontaneous emission are investigated.The results show that compared with the full-wave method,the quasi-canonical mode method can efficiently and accurately calculate the enhanced characteristics of spontaneous emission,and the nanopillar gap has an important influence on the resonance frequency of the quasi-canonical mode.These studies have important guiding significance for understanding the nanoscale dimer structure to enhance light-matter interaction.
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    Design of Pixel Compensation Algorithm for Video Image Based on Local Convolution
    ZHA Huaizhi
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (6): 1-8.   DOI: 10.13438/j.cnki.jdzk.2023.06.001
    Abstract90)      PDF(pc) (3962KB)(105)       Save
    A video image pixel compensation method based on local convolution (local convolution compensation) is proposed to repair missing pixels in high-speed moving targets.The method introduces local convolution to segment the neural network model and reconstruct video image frames.It activates the source video image and its corresponding pixel space,applies linear mean compensation to fill the interpolated frame holes in the video image,and evaluates the matching degree of the video image to complete the pixel compensation.Comparative experimental results show that the average gradient of the local convolution compensation method is 11.239,significantly higher than the other three comparative methods,which indicates that the video image after compensation using the local convolution method has higher clarity.
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    Sentiment Analysis Model of Specific Target Text Based on Convolutional Neural Network
    YE Haiyan
    Journal of Jishou University(Natural Sciences Edition)    2024, 45 (1): 24-29.   DOI: 10.13438/j.cnki.jdzk.2024.01.005
    Abstract61)      PDF(pc) (741KB)(104)       Save
    In the process of emotion analysis of specific target text,text sequence classification is limited by the labeling method,resulting in low accuracy and recall of analysis results,so a model of emotion analysis of specific target text based on convolution neural network is constructed.Specific target text sequences are analysed based on emotional differences,and the text feature matrix is used as input data to construct a convolutional neural network language model in the input layer,concatenating it into a part of speech sequence matrix.Segmented pooling captures different key features of text sequences and classifies and processes the extracted feature vectors.A dropout mechanism is added to complete sentiment classification of specific target texts,determine the importance information of each word in the text,and achieve sentiment analysis of specific target texts.The experimental results show that the accuracy of the model is higher than 84%,and the maximum recall rate is 87%,which can effectively achieve the emotional analysis of specific target text.
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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
    Abstract210)      PDF(pc) (1272KB)(104)       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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    Community Detection Algorithm for Bipartite Networks Based on Spectral Clustering
    LIU Chenchen, XU Ying
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (6): 9-13.   DOI: 10.13438/j.cnki.jdzk.2023.06.002
    Abstract100)      PDF(pc) (676KB)(103)       Save
    In order to solve the problem of low precision and original network information lose in community detection of bipartite network,a new spectral clustering algorithm named SVD-MS is proposed.This method maps Barber's problem of maximizing the module size of bipartite networks to the problem of singular value vector decomposition,and combines heuristic algorithms to quickly solve vector partitioning problems.Experimental results show that,the SVD-MS algorithm can effectively partition the community structure of bipartite networks and preserve the original network information.
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    Acoustic Radiation Force of Microbubbles Within Microcavities
    TIAN Zhen, KONG Peng, DENG Ke
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (6): 28-31.   DOI: 10.13438/j.cnki.jdzk.2023.06.005
    Abstract88)      PDF(pc) (1829KB)(103)       Save
    The trapping mechanism of microbubbles is analyzed based on microbubble acoustic radiation force theory and numerical simulation,and the acoustic radiation force of microbubbles in microcavities is studied.The theoretical analysis showed that when the driving frequency of the sound field is lower than the resonant frequency of the microbubble,the force direction of the microbubble points to the maximum value of the sound field.When the driving frequency of the sound field is higher than the resonant frequency of the microbubble,the force direction of the microbubble points to the minimum value of the sound field.Combined with finite element simulation of the quartz cavity,it is verified that the resonance properties exhibited by microbubbles of different sizes in the same acoustic field are different.Smaller microbubbles move towards the acoustic field minimum under the action of standing waves,while larger microbubbles move in the opposite direction.
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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
    Abstract180)      PDF(pc) (2328KB)(102)       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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    Resonant Casimir-Polder Force Properties of Atoms in the Vicinity of a Convex Structure
    GAO Guangbo, SHAN Xinyu, ZHAO Jinyun, HUANG Yonggang
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (6): 59-66.   DOI: 10.13438/j.cnki.jdzk.2023.06.010
    Abstract67)      PDF(pc) (1353KB)(100)       Save
    The influence of the transition frequency and position of a two-level atom in the vicinity the convex structure on the resonant casimir-polder force is studied by using COMSOL Multiphysics software.The results show that compared with the cross-sectional silver nanospheres,the convex structure produces a new surface plasmon resonance mode,which greatly enhances the resonance casimir-polder force on the atom.In addition,when the atom is close to the surface of the convex structure,the new resonance mode plays a leading role in the regulation of the resonant casimir-polder force,and the contribution of the new resonant mode to the resonant casimir-polder force decreases sharply with the increase of the distance.and the contribution of the resonance mode produced by the bulge is faster than that produced by the cross-section silver nanospheres.
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    Energy Functional of Orbital-Free Density Functional Theory for Sodium Metal Slab
    LIU Runfeng, HU Qihong, ZHOU Fang, CHENG Xiaodi, WANG Xiaoyun, HUANG Yonggang
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (6): 90-96.   DOI: 10.13438/j.cnki.jdzk.2023.06.014
    Abstract73)      PDF(pc) (713KB)(98)       Save
    The method of using OF-DFT to study the ground-state density and work function of metal sodium plates was explored.Through extensive numerical experiments,it was determined that a vW kinetic energy functional weight of 0.4 is required to obtain accurate ground-state properties for metal sodium plates,and this kinetic energy functional weight is applicable to different exchange-correlation potentials.
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    Entanglement Dynamics of Three-Level Atoms with Light Fields
    QING Jiayang, WU Yunwen
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (6): 44-49.   DOI: 10.13438/j.cnki.jdzk.2023.06.008
    Abstract75)      PDF(pc) (870KB)(97)       Save
    The system of three-level atom interacting with light field is studied by using the method of full quantum theory.Based on wave function,the dynamic evolution characteristics of different quantum states with the same coupling intensity are studied.In addition,the influence of different coupling intensity of the same quantum state on the dynamic evolution characteristics of the system is discussed.The results show that under the same coupling intensity,the population values of atoms in |b1> states first decrease and then increase with time,the population values of atoms in |b2> states and |b3> states first increase and then decrease with time,and the corresponding population values of |b2> states produce three peaks in the same period.The population values corresponding to the |b3> states produce two peaks in the same period,and there is also a trough after the first peak,and the population values of different quantum states show periodic oscillations with time.In the same quantum state,with the increase of the coupling coefficient,the dynamic evolution oscillation characteristics of the quantum state between the light field and atoms are enhanced,and the system dynamic evolution pattern always maintains periodic changes with the increase of time.
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    Complete Chloroplast Genome of Clematis ranunculoides:Characterization and Phylogeny Analysis
    WANG Ruolan, ZHANG Dequan
    Journal of Jishou University(Natural Sciences Edition)    2024, 45 (1): 66-76.   DOI: 10.13438/j.cnki.jdzk.2024.01.012
    Abstract57)      PDF(pc) (8763KB)(97)       Save
    To reveal the chloroplast genome characteristics of Clematis ranunculoides and its phylogenetic relationships,the present study adopted the Illumina platform to acquire high-throughput sequences,which were used for assemble,annotate,and characterize the complete chloroplast genome of C. ranunculoides.And then molecular phylogenetic trees were constructed with maximum parsimony (MP),maximum likelihood (ML) and Bayesian (BI) methods.The result shows that the total length of the chloroplast genome of C. ranunculoides is 159 741 bp,which encodes 112 genes,including 79 protein-coding genes,29 tRNA genes and 4 rRNA genes;there are 84 SSRs in the chloroplast genome of C. ranunculoides,and 57 of them are mono-nucleotide.Analysis of codon usage bias reveales that leucine is the most frequently utilized amino acid in the chloroplast genome.The topological structures are basically identical among MP,ML,and BI trees.Derived from the phylogenetic trees,Clematis is a monophyletic group,closely related to Anemone.And C. ranunculoides is closest to C. montana,which supportes the traditional classification results.
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    Spectrum Sensing Algorithm Based on Joint Detection of Skewness and Kurtosis
    TAN Zhewen, LEI Kejun, YANG Xi, WANG Xuming, TAN Yuhao
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (6): 14-19.   DOI: 10.13438/j.cnki.jdzk.2023.06.003
    Abstract83)      PDF(pc) (585KB)(96)       Save
    By normalizing the sample skewness and kurtosis of the received signal,a spectrum sensing algorithm based on joint detection of skewness and kurtosis (joint detection) is proposed.Utilizing the probability density function of the chi-square distribution,the theoretical false alarm performance of the algorithm is analyzed under non-asymptotic conditions,and the corresponding theoretical decision threshold is derived.In the simulation experiments,joint detection can still guarantee reliable detection results with small number of samples,and shows better detection performance than the classical Jarque-Bera (JB) spectrum sensing algorithm.
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    Harmonic and Inter-Harmonic Parameter Estimation Algorithm Based on MSLDSMC Window
    CHEN Qianming, ZHANG Zhiwei, LI Minghao, WANG Xuming, LEI Kejun
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (6): 20-27.   DOI: 10.13438/j.cnki.jdzk.2023.06.004
    Abstract93)      PDF(pc) (3030KB)(93)       Save
    The fast Fourier transform (FFT) method may encounter spectral leakage and picket fence effect in harmonic detection,resulting in low accuracy in detecting harmonic and inter-harmonic parameters.To improve the detection accuracy,based on the maximum side lobe decay window (MSLD) with excellent sidelobe characteristics,we have constructe an MSLD self-multiplication-convolution window (MSLDSMC) by multiplication and convolution operations.On this basis we propos a high-precision estimation algorithm for harmonic and inter-harmonic parameters of three spectral line interpolation.Simulation experiments conducted in different complex scenarios verify the accuracy of harmonic and inter-harmonic parameter estimation algorithms based on MSLDSMC window three spectral line interpolation.
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    Research Progress of Structure and Function of Nuclear Transcription Factor Relish
    ZHANG Hong, LIU Qingzhen
    Journal of Jishou University(Natural Sciences Edition)    2024, 45 (1): 77-83.   DOI: 10.13438/j.cnki.jdzk.2024.01.013
    Abstract77)      PDF(pc) (470KB)(93)       Save
    The nuclear transcription factor Relish is a member of the NF-κbs superfamily functioning as an important immune signaling effector.Relish contains a conserved Rel homologue domain at the N-terminal and an ankyrin repeat domain at the C-terminal.Relish is actived in response to certain external stimulations transmitted by the Imd pathway,via phosphorylation,cleavage and other posttranslational modification of Relish.Activated Relish then translocates to nuclear and binds to DNA to regulate the expression of target genes,helping organisms to adapt to various physiological environments and stimuli,resisting the invasion and infection of foreign pathogens.The paper provides an brief review of the structure and function of Relish.The structural features of Relish include Rel homology domain,ankyrin repeats domain,nuclear localization sequence,caspase target site,serine-rich regions,and proline-glutamate-serine-rich domain.Functions of Relish mainly involve participating in innate immunity,regulating neural development and lifespan,regulating intestinal homeostasis and morphology,participating in stress regulation and other physiological activities.
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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
    Abstract132)      PDF(pc) (840KB)(90)       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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    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
    Abstract186)      PDF(pc) (4478KB)(89)       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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    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
    Abstract196)      PDF(pc) (1800KB)(89)       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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