Table of Content

    25 July 2021, Volume 42 Issue 4
    Mathematics
    Calculation Formula of Perfect Matching Number of Two Types of Graphs
    TANG Baoxiang, REN Han
    Journal of Jishou University(Natural Sciences Edition), 2021, 42(4):  1-3. 
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    Two new types of graphs mTn and mKn,n are constructed. Using the classification nested recursion method, the counting formulas for different 1-factors of graphs mTn and mKn,n are given.
    Proof Converges with Probability That the k-th Order Central Absolute Moment of the Sample
    XING Jiasheng, YANG Yichuan, WU Sang
    Journal of Jishou University(Natural Sciences Edition), 2021, 42(4):  4-8. 
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    Considering the problem of convergence in probability of the k-th order center absolute moment of the sample, using Khinchin’s law of large numbers and the property of convergence in probability of random variable sequences, through inequality scaling techniques, the concrete proof is given that the k-th order central absolute moment of the sample converges with probability to the k-th order central absolute moment of the population.
    ConvergenceRates for the Empirical Bayes Test of Parameters in  the Kumaraswamy Distribution Family
    HUANG Jinchao
    Journal of Jishou University(Natural Sciences Edition), 2021, 42(4):  9-15. 
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    The Empirical Bayes (EB) test of parameters in Kumaraswamy distribution Family is investigated under linear loss function. By using the recursive kernel estimation and the monotone of Empirical Bayes function in case of iid samples, the EB test rules are constructed. Under suitable conditions the order of convergence rates approaches to O(n-λ(s-2.5)s-1), where s≥3, s∈N*.
    Almost Periodic Solution of the Neutral Integro-Differential Equations
    LIU Yijian
    Journal of Jishou University(Natural Sciences Edition), 2021, 42(4):  16-20. 
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    We consider the neutral integro-differential equations, by means of the theory of exponential dichotomies of linear system and fixed point theorem, we obtain the sufficient conditions for the existence and uniqueness of almost periodic solutions of the equations.
    Approximate Optimality Condition for Fractional Optimization Problems
    XIE Feifei, WANG Jiaolang, HU Lingli
    Journal of Jishou University(Natural Sciences Edition), 2021, 42(4):  21-26. 
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    In the case when the functions are not necessarily lower semicontinous and the sets are not necessarily closed, the fractional optimization problem is turned into a constraint optimization problem with Dinkelbach method. With the properties of ε-subdifferentials, some new constraint qualifications are introduced and some characteristic characterizations of ε-optimal solutions are established.
    Physics
    Study on Sound Insulation of Second Order Helmholtz Resonator
    ZHAO Zhun, KONG Peng, DENG Ke
    Journal of Jishou University(Natural Sciences Edition), 2021, 42(4):  27-30. 
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    Based on the sound insulation characteristics of the traditional Helmholtz resonator, the equivalent impedance of the Helmholtz resonator based on second-order resonance is derived by using the transfer matrix method layering, and the sound insulation characteristics of the second-order Helmholtz resonator are studied in combination with finite element simulation. It is verified that there are two sound insulation bands in the second-order resonator, and excellent sound insulation effect can be obtained by adjusting the geometric parameters. It has some research significance in acoustic application of sound noise reduction.
    Doping Manipulationon the Electron Transport Properties of the Phosphorene-Boron Carbon Diphosphorus Heterojunction
    WU Dan, LIAO Wenhu, LIN Lie, LUO Shuzhen, CHENG Xiaoli
    Journal of Jishou University(Natural Sciences Edition), 2021, 42(4):  31-37. 
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    Using the first-principles calculation method combining density functional theory and non-equilibrium Green's function, the electron transport properties of the armchair edge and the zigzag P-BC2P van der Waals heterojunction under finite bias are studied, and the influence of N-type electrons and P-type holes doping on the electron transport properties of the two edge types of heterojunctions. The research results show that: (1) Under the finite bias voltage, the two edge types P-BC2P van der Waals heterojunctions both exhibit nonlinear changes and negative differential resistance effects. The current growth of the P-BC2P heterojunction at the edge of the armchair is faster than that of the phosphorene nanoribbons, but the current growth of the P-BC2P heterojunction at the zigzag edge is slower than that of the phosphorene nanoribbons. (2) In the doping concentration range of 0.001~0.01 e/atom, N-type electrons/P-type holes doping can effectively control the conductance of P-BC2P heterojunction. Compared with the undoped, the conductance of the P-BC2P heterojunction at the edge of the armchair increases and decreases by up to 20% when doped with P-type holes, and decreases by up to 46.7% when doped with N-type electrons. The conductance of the zigzag edge P-BC2P heterojunction increases up to 196% when doped with P-type holes, and increases up to 164% when doped with N-type electrons.
    Computer and communication
    Method of Obtaining Part-of-Speech Tagging Rules Utilizing FP-Growth Algorithm
    MO Liping, HUANG Yongkun
    Journal of Jishou University(Natural Sciences Edition), 2021, 42(4):  38-43. 
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    To improve the quality of the training corpus needed by the part-of-speech (POS) tagging model, a method for acquiring POS tagging rules based on FP-Growth algorithm to automatically extract the POS tagging rules from the training corpus is proposed. A comparative experiment was carried out between the proposed method and the existing method of obtaining POS tagging rules based on Apriori algorithm. The experiment results reveal that, for small-scale training corpora of 1 000, 2 000, and 10 000 words, the number of POS tagging rules obtained by the former is the same as that of the latter, but the time consumption is only 0.013 866%, 0.010 399% and 0.003 132% of the latter, respectively, and for training corpora with a scale of 100 000 words and 1 million words, the latter cannot get any rule, but the former can still obtain effective rules within a reasonable period of time. Obviously, proposed method is feasible and efficient, and can meet the actual needs of automatically obtaining POS tagging rules from corpora of different sizes when optimizing the training corpus.
    An Optimized NMG Solution to an Improved Total Variational Registration Model
    HAN Xiaohua, YANG Fenlin
    Journal of Jishou University(Natural Sciences Edition), 2021, 42(4):  44-49. 
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    An improved total variational (TV) registration  model with both global smooth and discontinuous-preserving displacements is established by introducing hypersurface function as the kernel function of image registration regularization term. In the nonlinear multi-grid (NMG) method, a new smoothing method is constructed by using the interaction of delayed diffusion fixed point iteration and successive over relaxation iteration. And by interpolation of the errors on the coarse grid back to the fine grid using tomographic techniques during confinement, a fast and effective nonlinear multi-grid algorithm for solving improved TV model is designed. The experimental results show that the optimized NMG algorithm has higher registration accuracy and faster convergence than the NMG method. Improved TV model registration has less error, less time-consuming and better registration performance than TV model registration.
    Servers Virtualization Technology Application in Data Center Construction
    ZHANG Xian, CHEN Hongli, YANG Yaqi
    Journal of Jishou University(Natural Sciences Edition), 2021, 42(4):  50-54. 
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    The server is the core element of the data center, but the traditional server is not only in a single form, but also has defects such as complex management, so it is gradually eliminated, replaced by virtual server, and the technology to achieve virtual server is virtualization technology (collectively referred to as server virtualization technology).Server virtualization technology, as a relatively new technology, is not popular in the construction of data centers. Traditional servers are still widely circulated, which hinders the update and development of data centers.Therefore, for the purpose of popularizing server virtualization technology, we will carry out research, discuss the basic concepts and main advantages of this technology, and finally put forward the server virtualization application scheme and matters needing attention in the construction of data center.
    Multi-Frequency Signal Parameter Analysis Based on High-Order Rectangular Convolution Window
    SHUAI Guoxiang, WANG Xuming, ZHANG Zhiwei, PENG Hao
    Journal of Jishou University(Natural Sciences Edition), 2021, 42(4):  55-58. 
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    When the multi-frequency signal is sampled asynchronously, in order to reduce the negative influence of the frequency spectrum leakage and the fence effect in the fast Fourier transform of the multi-frequency signal. Based on the theoretical basis of rectangular convolution window and the triple-spectral-line interpolation, proposed a method of signal parameter estimation that combines a high-order rectangular convolution window and triple-spectral-line interpolation. The simulation experiment results show that, for the amplitude and frequency of the multi-frequency signal, the method of high-order rectangular convolution window triple-spectral-line interpolation has higher estimation accuracy than the method of FFT and the method of Hanning window.
    Biology and chemical industry
    A Study on the Ultrastructure of Two Species of Frustulia (Bacillariophyta)
    YUAN Li, LIU Bing, ZHOU Yangyan, DU Jie, ZHANG Wanying
    Journal of Jishou University(Natural Sciences Edition), 2021, 42(4):  59-65. 
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    This paper reviews the naming changes of two Frustulia species and provides two new Chinese names for them: F. asiatica and F. amphipleuroides. Based on the observation of the light and scanning electron microscopy on the above two species, we find that: (1) the unique feature combination of F. asiatica is its linear-lanceolate valve shape and higher stria density; (2) the unique feature combination of F. amphipleuroides is 0~3 isolated poroids and obviously elongated central area.
    Research Progress of Inorganic Nonmetallic Coatings on Rechargeable Aqueous Zinc Ion Batteries
    JIN Boxuan, MA Kaixuan, ZHANG Yu, ZHANG Ruochen, WANG Ling, HE Zhangxing
    Journal of Jishou University(Natural Sciences Edition), 2021, 42(4):  66-74. 
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    The rechargeable aqueous zinc-ion batteries (ZIBs), as a new energy storage technology, have advantages of good safety, high energy density and low production cost, as well as the current problems restricting the development of zinc-ion batteries. Based on the design of high performance zinc anode, the inhibition mechanism of inorganic nonmetal coating on zinc dendrite growth is analyzed. According to different coating materials, the research progress of zinc anode coated with inorganic nonmetallic materials is reviewed.
    Characteristic column:Study on Wuling Mountain Area
    Optimization Path of Business Environment in Western Hunan from the Perspective of Collaborative Governance
    ZHANG Yanfei, ZHU Haiying
    Journal of Jishou University(Natural Sciences Edition), 2021, 42(4):  75-81. 
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    Taking Western Hunan as an example, this paper explores the optimization path of business environment from the perspective of collaborative governance based on multiple stakeholders. The paper constructs the theoretical mechanism of regional business environment optimization from the perspective of collaborative governance, and proposes that it is necessary to integrate the objectives of different stakeholders, protect the rights and interests of multiple stakeholders, build a scientific operation mechanism, and pay attention to the impact factors such as the quality of legal system, service supervision coordination and supporting environment. The research shows that the optimization of business environment in Western Hunan is faced with such problems as the high cost of enterprise elements, the lack of collaborative ability of government services, the lack of coordination of legal guarantee, and the poor linkage of supervision and law enforcement. Therefore, in order to stimulate the vitality of regional market entities and enhance the collaborative governance ability of the main bodies, we should effectively play the role of the government and the market, build a cooperative operation mechanism among multiple subjects, improve the level of coordination of legal protection, and enhance the coordination of law enforcement and supervision.
    Revitalization of Rural Culture ofWestern Hunan from the Perspective of Rural Tourism
    LIU Ying
    Journal of Jishou University(Natural Sciences Edition), 2021, 42(4):  82-86. 
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    From the perspective of rural tourism, this paper explores the relistic plight and developing path of rural cultural revitalization in Western Hunan, which is rich in rural cultural resources, analyzes and finds that there are some plight of “space absence”, “spiritual absence” and “subject absence” in the revitalization of rural culture in Western Hunan, and puts forward that we should make full use of rural tourism as a carrier to strengthen the scientific planning, protection and inheritance of rural culture, integrate the national ecological and cultural elements and regional characteristics of Western Hunan into tourism practice, actively expand the display platforms of local culture, improve the spiritual connotation of local culture, broaden the cultivation path of rural cultural talents, introduce and retain rural cultural talents, optimize the quality of rural cultural tourism in Western Hunan and promote the prosperity and development of rural culture.
    Sports
    Protection and Inheritance of Traditional Sports Culture of Luoba Nationality
    LI Yue, ZHANG Yanhong, LUO Shuaicheng
    Journal of Jishou University(Natural Sciences Edition), 2021, 42(4):  87-91. 
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    Based on the research on the characteristics and value of the sports culture of the Luoba minority, this paper concludes that with the rapid development of modern civilization and the acceleration of urbanization, the culture of Luoba nationality has been changed in modern life, and this change means that a traditional national sports is gradually disappearing. Based on this, through the investigation and research, it is believed that in order to fully understand the importance of the traditional sports culture of the Luoba nationality, it is necessary to strengthen the cognition of the sports culture of the Luoba nationality and excavate its own characteristics, so as to serve the rural cultural construction of the surrounding Tibet area of the Luoba nationality, enrich the mass cultural entertainment content of the Luoba nationality, and carry forward the national culture.
    Investigation and Research on Sports Behavior of Patients with Cervical Spondylosis in Universities of Western Hunan
    TIAN Rui
    Journal of Jishou University(Natural Sciences Edition), 2021, 42(4):  92-96. 
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    This paper adopts the method of documentary and questionnaire survey,taking 248 teachers with cervical spondylosis in universities as research objects.The results showed that the causes of cervical spondylosis of college teachers in Xiangxi are mainly affected by age, gender and work. Moreover, teachers with cervical spondylosis do not have a strong understanding of the idea that physical exercise can treat cervical spondylosis.Therefore, the relevant departments of the school should strengthen the propaganda of sports, protect the environment of teachers' sports, and enhance their sports consciousness.
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