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    Existence of Positive Solution for a Class of Fractional Four-Point Boundary Value Problems
    PAN Xinyuan, HE Xiaofei
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (2): 1-6.   DOI: 10.13438/j.cnki.jdzk.2022.02.001
    Abstract133)      PDF62)       Save
    By applying Green's function,Arzela-Ascoli theorem and fixed point theorem on cones,the existence of positive solution is obtained for a class of p-Laplacian type fractional differential boundary value problems.
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    Design Efficiency of Three-Level Minimum Projection Uniform Designs
    BAI Qiming, HUANG Xingyou, XUE Huili, LI Hongyi
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (2): 31-37.   DOI: 10.13438/j.cnki.jdzk.2022.02.006
    Abstract129)      PDF48)       Save
    Under the centered L 2-discrepancy,the analytical relationship between the uniformity pattern and design efficiency of three-level orthogonal designs with strength 2 is established.For the three-level orthogonal arrays with strength 3,the minimum projection uniformity criterion is equivalent to the design efficiency criterion.For the three-level designs,a tight lower bound of the uniformity pattern is obtained,which can measure whether the design is the minimum projection uniform design.
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    Allowed Transformations and Symmetry Groups of Variable-Coefficient Gordoa-Pickering Equation
    SU Dan, YONG Xuelin
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (2): 7-10.   DOI: 10.13438/j.cnki.jdzk.2022.02.002
    Abstract125)      PDF35)       Save
    The allowed transformations of the variable coefficient Gordoa-Pickering (VCGP) equation with six arbitrary functions are obtained.These transformations keep the form of the equation invariant but possibly change the arbitrary coefficients.Based on the allowed transformations,two types of Lie point symmetry groups are found.Finally,symmetry reductions and group invariant solutions of the VCGP equation are also considered.
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    Power Limit of Locomotive Traction Motor Under Abnormal Working Conditions
    CHEN Gang, CHEN Xixiang
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (2): 60-67.   DOI: 10.13438/j.cnki.jdzk.2022.02.010
    Abstract122)      PDF33)       Save
    Under abnormal conditions,it is necessary to effectively limit the traction motor power to ensure the normal and safe operation of electric locomotive. On the basis of expounding the influence  of the unlimited traction motor output power of electric locomotive on the converter module and the motor,ther esearch focuses on the analysis of the principle of limiting the output power of traction motor under the conditions of abnormal traction network voltage,abnormal cooling water temperature,abnormal traction motor temperature and fault of traction converter module,and then puts forward the specific implementation scheme of power distribution of traction motor under the power limitation mode. The test results show that the electric locomotive can operate according to the set power limit under different abnormal conditions or fault conditions,which verifies  the power distribution scheme of locomotive traction motor under power limit conditions.
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    Research Development on the Predictive Value of MELD Score for Short-Term Prognosis of Patients with Alcoholic Liver Disease
    LI Cuiqin, PENG Zhi, LI Xuefeng, XIANG Ping
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (2): 73-77.   DOI: 10.13438/j.cnki.jdzk.2022.02.012
    Abstract119)      PDF48)       Save
    Number of patients with Alcoholic Liver Disease (ALD) tends to increase year by year in China.It is important for clinicians to determine a treatment plan based on the condition and prognosis of each patient in a timely and accurate manner,and the Model for End-Stage Liver Disease (MELD) has been widely used to predict the prognosis of patients with various liver diseases.This paper reviews the study on the predictive value of MELD score for short-term prognosis of patients with ALD,so as to provide a reference for clinical treatment.
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    Prediction of Vertical Displacement of Bridge Excavation Based on Neural Network
    LI Jiawen, WANG Chongxu, WANG Hao
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (2): 53-59.   DOI: 10.13438/j.cnki.jdzk.2022.02.009
    Abstract119)      PDF55)       Save
    Based on BP neural network method,the vertical deformation prediction of excavation under the bridge is studied.Firstly,the parameter sensitivity of different soil layers is studied and analyzed.It is concluded that the vertical displacement is only sensitive to the parameter change of the first layer of soil.And then,the control parameters of the neural network are determined as cohesion,internal friction angle,elastic modulus,Poisson's ratio,excavation depth,and excavation length of the first layer of soil.The B-R method is used for iterative calculation Verification of the established network show that the prediction accuracy of the model is high.
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    Changsha Dialect Recognition Based on CTC-GRU Model
    LIANG Xiaolin, SHEN Xiangfei, LIANG Zhao, QIU Hailin
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (2): 45-52.   DOI: 10.13438/j.cnki.jdzk.2022.02.008
    Abstract116)      PDF54)       Save
    In order to recognize continuous speech in Changsha dialect with a large vocabulary,a gated linear element neural network model based on Connectionist Temporal Classification(CTC) algorithm is proposed.Firstly,the characteristic parameters of speech are extracted by Mel-scale Frequency Cepstral Coefficients(MFCC),and then the extracted characteristic parameters are input into gated linear unit neural network.CTC algorithm is used for training and optimization,and the whole prediction label of input sequence is obtained.Finally,the results of the CTC model,the GRU model and the CTC-GRU model are compared on the self-built corpus of Changsha dialect,and the Word Error Rate(WER) is taken as the evaluation index.The results show that the CTC-GRU model can achieve faster convergence and greater accuracy compared with the other two models.
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    Analytical Solution of Matric Suction for Advanced-Peak Pattern Rainfall Infiltration into a Two-Layered Foundation
    XU Ruilin, QIN Weixing, HE Yong, HU Huiren, YANG Le, WANG Cong, XIONG Xuanyu
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (3): 57-65.   DOI: 10.13438/j.cnki.jdzk.2022.03.010
    Abstract115)      PDF16)       Save
    In order to reveal the influence of advanced-peak rainfall infiltration on the matrix suction distribution of a two-layered foundation,the following research work is carried out.Firstly,based on Richards transient unsaturated seepage equation and Gardner soil water characteristic function,the water transport model of a two-layered unsaturated foundation for advanced-peak rainfall infiltration is established,and the transient analytical solution of matrix suction for advanced-peak pattern rainfall infiltration into a two-layered foundation is established by Laplace transform.Then,the analytical results are compared with those obtained from the finite element simulation,which indicates that the analytical solution is reasonable.The research results provide a convenient means to predict the evolution characteristics of matrix suction of a two-layered foundation for non-uniform rainfall infiltration,and can provide technical support for the evaluating bearing performance and reducing disaster of a foundation in rainy season.
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    Safety Impact of Blasting Construction in Xiazhuang Copper Mine on Adjacent Binghanhe Tunnel
    CUI Guangyao, TIAN Yuhang, WANG Mingsheng
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (4): 51-57.   DOI: 10.13438/j.cnki.jdzk.2022.04.010
    Abstract114)      PDF31)       Save
    Through FLAC3D calculation software,the displacement,stress and safety factor of adjacent tunnel lining and rail during construction blasting in Xiazhuang copper mine are analyzed.The results show that after the blasting construction,the maximum horizontal displacement of the lining is 4.07 mm,the maximum horizontal convergence is 0.08 mm,the maximum settlement is 4.23 mm,the maximum lateral displacement of the rail is 3.46 mm,and the maximum settlement is 3.48 mm,which all meet the displacement control standard.The maximum principal stress,minimum principal stress and maximum shear stress of lining and rail increase slightly.The minimum safety factor of lining is 4.49,and the safety factor of lining after blasting construction meets the specification requirements.
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    Topological States of Two-Dimensional Honeycomb Elastic Materials
    LI Yinming, KONG Peng, BI Rengui, HE Zhaojian, DENG Ke
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (4): 47-50.   DOI: 10.13438/j.cnki.jdzk.2022.04.009
    Abstract113)      PDF76)       Save
    We introduce the concept of valley states to elastic materials and design a two-dimensional honeycomb elastic phonon crystal.When the system is protected by inverse symmetry,three pairs of Dirac points appear at the K and K′ point,distributed in different frequency bands.The spatial symmetry of the system is broken by adjusting its geometrical structure parameters so that the Dirac points open and form valley at the K and K′ point.In this multi-band valley exists edge states connecting the upper and lower body bands,which is used in elastic materials can be used to achieve edge transport and design acoustic devices with good performance.
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    Design of Controller for Pure Electric Bus Based on STM32
    WANG Guoyi, YUAN Tao, YU Xingguo, LI Hao
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (3): 52-56.   DOI: 10.13438/j.cnki.jdzk.2022.03.009
    Abstract112)      PDF40)       Save
    A pure electric bus controller based on STM32 is designed through analyzing the function and running state of pure electric bus control. The function of each module of the controller is analyzed,and the power supply circuit and voltage detection circuit are designed. The controller adjusts the speed of the DC motor through outputting pulse width modulation with different duty cycles.The information collected by the sensor is transmitted to the microprocessor in real time through the CAN bus,and the microprocessor analyses the collected information and sends commands through CAN bus to control the running state of the bus safely,accurately and in real time.
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    Lattice Boltzmann Method for Spatial Fractional Convection Equations
    WEI Xuedan, LI Mengjun, DAI Houping
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (2): 17-22.   DOI: 10.13438/j.cnki.jdzk.2022.02.004
    Abstract111)      PDF53)       Save
    Lattice Boltzmann model is established to numerically solve spatial fractional convection equations. Through integral mean value theorem and linear interpolation method,the fractional derivative was discretized,and the equilibrium distribution functions in each direction were derived by combining Taylor expansion and Chapman-Enskog multi-scale expansion.Numerical results verify the effectiveness of the constructed model via one-dimensional and two-dimensional problems.
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    Resilient Response Mechanism of Agricultural Enterprises Under Major Public Health Emergencies
    ZHANG Huaiying, CHANG Le, LI Lu, GAO Xin
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (2): 78-83.   DOI: 10.13438/j.cnki.jdzk.2022.02.013
    Abstract110)      PDF63)       Save
    Under major public health emergencies,organizational resilience can enable business gain corresponding competitive advantage in the face of market supply and demand turbulence.The resilience sources of the two agricultural enterprises,Muyuan Industrial Group Co.,Ltd.and New Hope Group Co.,Ltd. are explored.An emergency response mechanism for agricultural enterprises based on organizational resilience is established in initiation period,duration period,regression period and contingency period.This study provides reference for the agricultural enterprises to improve their management "immunity" and establish a crisis management mechanism based on resilience.
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    Multiple Linear Regression Analysis of Influential Factors for Cotton Yield in Changji Prefecture
    LI Shuo, WANG Xintong, YANG Jibin, ZHANG Youjiang
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (2): 84-88.   DOI: 10.13438/j.cnki.jdzk.2022.02.014
    Abstract110)      PDF55)       Save
    Two variables,rainfall and planting area,were selected to establish multiple linear regression model,and the influential factors for cotton yield were analyzed to provide reference for cotton production in Changji Prefecture.
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    Thermal Lens Effect with Low-Power Laser
    LIN Yiping, CHEN Kexiong, LI Lingyan, LIU Jingfeng
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (4): 34-41.   DOI: 10.13438/j.cnki.jdzk.2022.04.007
    Abstract108)      PDF57)       Save
    COMSOL Multiphysics 5.5 software was used to build a model to study the relationship between the change of lens focal length and the change of laser power.The experimental scheme was designed through theoretical analysis and the formula for calculating the focal length of the thermal lens was determined.Experiments were conducted to explore the thermal lens effect with low power laser,and the visualization of the thermal lens effect with low-power laser was realized.The soy sauce lens was measured as thermal concave lens.Using knife edge method and software fitting measurement of laser radius,combined with other data to calculate the focal length of the thermal concave lens,the measured relative error was 3.6%.Finally,taking the focal length as the intensity reference of the thermal lens effect,the measured intensity of the thermal lens effect was positively correlated with the optical power.
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    Research Advances in Diagnosis and Treatment of Metabolic- Associated Fatty Liver Disease
    WANG Zijin, LI Xuefeng, XIANG Mingjun, OU Fangbo
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (4): 81-86.   DOI: 10.13438/j.cnki.jdzk.2022.04.014
    Abstract108)      PDF44)       Save
    Metabolic-associated fatty liver disease (MAFLD) is the most common chronic liver disease in the world and also the number one liver disease in China.Its incidence rate shows an upward trend year by year.If the degree of liver steatosis is aggravated,liver fibrosis may occur and eventually lead to liver cirrhosis and even hepatocarcinoma.All these are serious hazards to people's health.In recent years,many new changes have taken place in the diagnosis and treatment of MAFLD,which has become a research hotspot.This article reviews the global harm and health burden of fatty liver disease,the change of fatty liver naming and the diagnosis and treatment of metaboli-associated fatty liver disease.The purpose of this study is to provide reference for the early diagnosis,disease evaluation and new drug development of metabolic-associated fatty liver disease.
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    Theoretical Derivation of the Kramers-Kronig Relationship Based on the Fourier Transform
    SU Hongmei
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (3): 48-51.   DOI: 10.13438/j.cnki.jdzk.2022.03.008
    Abstract106)      PDF40)       Save
    From the causal law of physical experimental facts,without concrete microscopic physical model, this paper discusses the physical mechanism and theoretical derivation of the Kramers-Kronig relationship based on Fourier transform,dispersion theory,and residue theorem.
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    Temporal and Spatial Changes of Healthy City Construction in Wulingshan Area
    HE Linhai, LI Jiajia, WU Jilin, DENG Ziyi, ZHONG Ying
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (3): 84-92.   DOI: 10.13438/j.cnki.jdzk.2022.03.014
    Abstract106)      PDF34)       Save
    Taking six key cities in Wuling Mountain Area as the research object,this paper proposes a healthy city construction evaluation index system composed of five subsystems (including 21 indexes) of economy,society,environment,culture and medical treatment,determines the index weight by using the entropy weight method,and analyzes the spatial-temporal changes of healthy city construction by using the comprehensive index method and ArcGIS software.The results show that the comprehensive index of Huaihua City in healthy city construction of ranks the highest among the six key cities in 2010,2015 and 2020,followed by Jishou City,Qianjiang District,Tongren City,Zhangjiajie City and Enshi City.In terms of temporal dimension,the ranking of Tongren City has been greatly improved.The ranking Enshi City has always been in the low.The ranking of Zhangjiajie City declined at first and then rebounded.The ranking of Jishou City and Huaihua City has always been stable in the top three,and the ranking of Qianjiang District has always been in the middle.In terms of spatial dimension,the construction level of the five subsystems of economy,society,environment,culture and medical treatment is slightly different.The overall pattern has changed from "low in the northwest and high in the Southeast" to "low in the north and high in the South",and finally to "low in the northeast and high in the southwest" .In order to promote the high-quality development of the key cities in Wuling mountain area,according to the spatio-temporal change results of the healthy city construction of the six key cities,suggestions are put forward to improve the healthy city construction level of each city from the five aspects of economy,society,environment,culture and medical treatment.
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    New Way of Industrialization  for Zhangjiajie,a Tourism City
    DENG Yulu
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (2): 68-72.   DOI: 10.13438/j.cnki.jdzk.2022.02.011
    Abstract105)      PDF47)       Save
    The necessity,problems and historical opportunities of strengthening industrialization  in Zhangjiajie City are analyzed,and suggestions are made to promote the deep integration of industry and tourism,strengthen the construction supporting industrial  facilities,cultivate a new industrial system,and improve the policy making for industrial development.
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    Preparation of Li 4 Ti 5 O 12 by Solid-State Method and Exploration of Calcination Temperature
    LONG Ruilai, WU Xianming, WU Xiuting, YIN Caishuo
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (3): 72-78.   DOI: 10.13438/j.cnki.jdzk.2022.03.012
    Abstract104)      PDF33)       Save
    Li 4 Ti 5 O 12 powders were prepared by solid-state reaction and two-step calcination method with Li 2CO 3 and TiO 2 as starting materials and anhydrous ethanol as dispersant.The microstructure and morphology of the materials were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM).The electrochemical properties of the materials were tested by constant current charge-discharge,AC impedance and cyclic voltammetry.The results show that the pure phase Li 4 Ti 5 O 12 with complete crystal structure could be synthesized after calcination at 800  ℃ for 6h,and uniform dispersion with particle size of 200~400 nm.The first reversible specific capacity of the Li 4 Ti 5 O 12 sample was 157.67 mA·h/g at the rate of 0.5 C,and the coulombic efficiency was 96.1%,the capacity retention was 94.3% after 100 cycles.The first reversible specific capacity was 107.0 mA·h/g at the rate of 0.5C,the coulombic efficiency was 96.1% and capacity retention was 84.1% after 1 000 cycles.
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    Existence and Uniqueness of Solutions for a Class of Fractional Differential Equations with Boundary Value Problems
    LI Yiyun, XIE Jingli
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (3): 1-6.   DOI: 10.13438/j.cnki.jdzk.2022.03.001
    Abstract103)      PDF74)       Save
    With Banach contraction mapping principle and Krasnoselskii's fixed point theorem,we obtain the existence and uniqueness of solutions for nonlocal boundary value problems of nonlinear fractional differential equations with Caputo and Hilfer-Hadamard fractional derivative.
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    Ultrastructure of Cymbella subhelvetica Krammer
    LONG Jiyan, LIU Bing, XU Sanmei, TANG Haipeng
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (4): 67-71.   DOI: 10.13438/j.cnki.jdzk.2022.04.012
    Abstract102)      PDF34)       Save
    To reveal the ultrastructural features of Cymbella subhelvetica Krammer,this study carries out a thorough observation using scanning electron microscope.The observational results demonstrate that C. subhelveticapossesses the following diagnostic features:(1)valves distinctly dorsiventral;(2)distal raphe fissure curved dorsally,proximal raphe ends teardrop not deflected;(3)no apical pore fields;(4)striae uniseriate,slightly radiate except closing to each apex where becoming convergent dorsal striae 9~11/10 μm,ventral striae 9~13/10  μm;(5) Areolae mostly lineate,occasionally Y-shaped,and areolae 30~33/10 μm;(6) 4~7 stigmata.Above characteristics together constitute a unique combination of features that distinguish and identify C. subhelvetica.
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    Quotient Option Pricing Based on O-U Process withStochastic Interest Rate
    LI Jingnan, LIU Huili
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (2): 23-30.   DOI: 10.13438/j.cnki.jdzk.2022.02.005
    Abstract101)      PDF40)       Save
    Assuming that the underlying asset follows a multi-dimensional exponential O-U process,and the interest rate follows the Ho-Lee model and the extended Vasicek model respectively.By the multi-dimensional Girsanov theorem and the method of measure transform,we derive the pricing formula of quotient options with uncertain strike price.
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    HPLC Determination of Ursolic Acid and Oleanolic Acid in Paulownia Leaves from Xiangxi
    XU Yuhui, ZHOU Jiani, QIN Aitao, HAN Xiangyun, YANG Dequan
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (4): 92-96.   DOI: 10.13438/j.cnki.jdzk.2022.04.016
    Abstract98)      PDF41)       Save
    An efficient,accurate and stable method for the determination of ursolic acid and oleanolic acid has been established.Then the contents of ursolic acid and oleanolic acid in Paulownia leaves in Xiangxi were determined.High performance liquid chromatography (HPLC) method was adopted,and the chromatographic conditions were as follows:(1) chromatographic column:TADE-PAK AF-C18 column(250 mm×4.6 mm,5 μm;(2) mobile phase:acetonitrile-methanol-0.5% ammonium acetate solution (Volume ratio 61∶18∶21);(3) flow rate:1 mL/min;(4) detection wavelength:210 nm;(5) column temperature:35 ℃;(6) sample size:10  μL.The results showed that the separation degree of oleanolic acid and ursolic acid was 1.73,which met the requirements.The linear relationship between ursolic acid and oleanolic acid was good in the range of 0.497 6~9.952 μg and 0.126 1~2.523 μg (r=0.999 9),respectively,The average recoveries of ursolic acid and oleanolic acid were 99.93% and 98.97%,respectively.The contents of ursolic acid and oleanolic acid in Paulownia leaves in Xiangxi were 4.54~7.07 mg/g and 2.50~3.20 mg/g,respectively.HPLC method has good separation effect,high sensitivity and high accuracy,and is a scientific and effective method for the determination of ursolic acid and oleanolic acid in Paulownia leaves.
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    Optimization Model for C4 Olefin Preparation Based on Random Forest and L-M Algorithm
    JIANG Zihao, REN Tao, ZHOU Qi, LUO Jiamian
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (3): 79-83.   DOI: 10.13438/j.cnki.jdzk.2022.03.013
    Abstract97)      PDF21)       Save
    It is important to investigate the catalyst combination and temperature on the preparation of olefins by ethanol coupling.Firstly,ANOVA was used to screen the important influencing factors;then,the importance of the influencing factors on ethanol conversion and C4 olefin selectivity was analyzed by random forest algorithm:temperature>catalyst mass>ethanol concentration>Co loading>charging ratio;finally,multiple non-linear regression was performed by L-M algorithm,and the optimal C4 olefin yield was obtained with particle swarm algorithm.The optimal value was 42.548 5%.
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    Liu Estimation in Partially Linear Varying Coefficient Models
    AN Bailing, LU Qi, MA Ning
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (4): 1-6.   DOI: 10.13438/j.cnki.jdzk.2022.04.001
    Abstract97)      PDF72)       Save
    This paper considers the biased estimators on the parameter components in partially linear varying coefficient model.Based on the Profile least-square approach and Liu estimation method,we propose Profile-Liu estimator and section least-square general Liu estimator for the parametric components.We prove that the Profile-Liu estimation is better than the Profile least-square estimation,and the section least-square general Liu estimation is better than the Profile-Liu estimation under certain conditions.
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    Lattice Boltzmann Model for Solving Nonlinear Coupled Long and Short Wave Equations
    SONG Tongzheng, DAI Houping, FENG Shuting, WEI Xuedan
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (3): 7-14.   DOI: 10.13438/j.cnki.jdzk.2022.03.002
    Abstract96)      PDF46)       Save
    With Taylor expansion and Chapman-Enskog multi-scale expansion techniques,the equilibrium distribution functions and the correction functions are derived,and the two functions are introduced into the D1Q3 lattice Boltzmann model with two distribution functions.With this model,the initial-boundary value problem for a class of nonlinear coupled long-short wave equations is solved.For the plane wave and solitary wave solutions,the numerical simulation results verify the validity of the model for solving the nonlinear coupled initial-boundary value problems of the long-short wave equation.
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    Design of Filter and Beam Aplitting Device Based on Photonic Crystal Ring Cavity
    WU Cong, SUN Jing, SU Muyang, ZHONG Liang
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (2): 38-44.   DOI: 10.13438/j.cnki.jdzk.2022.02.007
    Abstract91)      PDF43)       Save
    Based on the resonance coupling principle of photonic crystal ring cavity and waveguide,a  three-port photonic crystal dual-function device with two-dimensional triangular lattice was designed,which was composed of ring defect and line defect.The plane wave expansion method and the finite difference time domain method were used to analyze the transmission characteristics of optical wave in the device,and thus  the transmission characteristic curve and the light field distribution were obtained.Then the influence of the number and density of the central dielectric column on the transmission efficiency of the output port was discussed.The results show that the frequency can be selected by adjusting the number of central dielectric columns.When the number of medium column was 5,the device achieved the filtering function of 1.346 μm,1.455 μm and beam splitting function of 1.414 μm.According to the influence of the horizontal and vertical spacing of the central column on the transmittance,the optimal structure parameters of the device was obtained,and the transmittance of the filter wavelength and beam splitting wavelength of the device are calculated.
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    Photocatalytic Degradation of Bisphenol a by Sulfur-Modified Cadmium-Rich Biomass Carbon
    CAO Jiaji, WANG Ping, LING Dingxun, HUANG Chao
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (4): 72-80.   DOI: 10.13438/j.cnki.jdzk.2022.04.013
    Abstract88)      PDF34)       Save
    Using biomass sorghum after remediation of cadmium-contaminated soil as raw material,sulfur-modified biochar based photocatalyst was prepared by calcination and hydrothermal reaction.The morphology and crystal structure of the photocatalyst were analyzed by scanning electron microscopy and X-ray diffraction.The results showed that cadmium sulfide crystals were successfully loaded on the biochar.The photocatalytic degradation experiment found that the photocatalyst can rapidly degrade bisphenol A (BPA) in water,and its photocatalytic degradation rate is 15.5 times and 2.4 times that of biomass sorghum biochar and cadmium sulfide,respectively.The influencing factor experiment found that the acidic conditions and the increase of the material dosage can significantly improve the photocatalytic degradation rate of BPA.Cycling experiments showed that the material has good photocatalytic stability,and quenching experiments showed that the main active species in the reaction are holes (h +),followed by ·OH and ·O -2.
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    Approximate Optimality Conditions for DC Composite Optimization Problems
    HU Xingxing, ZHENG Qinghui, TIAN Liping
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (3): 32-37.   DOI: 10.13438/j.cnki.jdzk.2022.03.005
    Abstract87)      PDF31)       Save
    With the properties of function ε-subdifferential and the new constraint qualification,the characteristic characterization of approximate optimal solution for DC composite optimization problem is established.
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    FFT Dielectric Loss Angle Measurement of Improved Rife-Vincent(Ι) Window
    ZHANG Zhiwei, PENG hao, TAN Yuhao, LI Minghao, WANG Xuming
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (3): 44-47.   DOI: 10.13438/j.cnki.jdzk.2022.03.007
    Abstract87)      PDF26)       Save
    Due to the asynchronous sampling of the signal,there will be spectrum leakage when using FFT to process the signal,resulting in the low measurement accuracy of FFT dielectric loss angle.In order to improve the measurement accuracy of dielectric loss angle,the side lobe characteristics of different window functions are analyzed.A new cosine window is constructed through the self-multiplication operation of Rife-Vincent (Ι) window,and an FFT dielectric loss angle measurement method based on improved Rife-Vincent (Ι) window is proposed.The new window function has better sidelobe characteristics than the traditional window function,and improves the suppression effect of spectrum leakage.The simulation results show that the measurement accuracy of using Rife-Vincent (Ι) self-multiplication window method is higher than that of using Hanning window and Blackman window method.
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    Relaxed Total Lagrange Duality and Optimality Conditions for the Convex Infinite Programming
    ZHENG Qinghui, HU Xingxing, WANG Xianyun
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (3): 26-31.   DOI: 10.13438/j.cnki.jdzk.2022.03.004
    Abstract85)      PDF26)       Save
    With the properties of subdifferential of functions and some new weaker constraint qualifications,the total duality and optimality condition between the convex infinite optimization problem and its relaxed Lagrange dual problem are established.
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    New Lower Bound of Wrap-Around L2-Discrepancy for Five-Level U-Type Designs
    HU Liuping, PEI Wu, ZHOU Yu, OU Zujun
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (4): 7-10.   DOI: 10.13438/j.cnki.jdzk.2022.04.002
    Abstract85)      PDF57)       Save
    We obtain a new expression of wrap-around L 2-discrepancy for five-level U-type designs.A new lower bound of wrap-around L 2-discrepancy can be derived via the expression and a mathematical inequality.
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    Well-Posedness of Solutions of Artificially Compressed Navier Stokes Equations with Jump Noise
    ZHANG Fang
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (2): 11-16.   DOI: 10.13438/j.cnki.jdzk.2022.02.003
    Abstract85)      PDF47)       Save
    For  the difficulty of numerical calculation under incompressible constraints,the artificial compression method is introduced.With Lévy It formula,uniform a priori estimation,local monotonicity and weak convergence method,the existence and uniqueness of strong solutions of the artificial compression Navier- Stokes equation is obtained by the classical Minty-Browder method.
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    Influence of College Innovation Support on Students' Innovative Behavior:Mediating Effect of  Motivation for Participation
    PENG Liping
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (2): 89-96.   DOI: 10.13438/j.cnki.jdzk.2022.02.015
    Abstract84)      PDF31)       Save
    To explore the influence mechanism of college innovation support on students' innovative behavior,this paper examines the relationships among college innovation support students' motivation for participation and students' innovative behavior.Analysis of 604 samples from five universities in Hunan reveal that college innovation support exerts a significantly positive influence on students' innovative behavior.Students' motivation,including self-strengthening and social-strengthening motivation,has mediating effect.
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    Correlation Analysis of Serum Selenium and Gestational Diabetes Mellitus
    YANG Yan, XU Xiaoyan, CHEN Zaiwang
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (3): 93-96.   DOI: 10.13438/j.cnki.jdzk.2022.03.015
    Abstract84)      PDF19)       Save
    Objective:To explore the correlation between serum selenium and gestational diabetes mellitus.Methods:From March 2020 to September 2021,360 pregnant women were selected as subjects according to the inclusion criteria,180 of whom were normal physical examination subjects with negative GDM diagnosis and were classified as control group,and 180  with positive GDM diagnosis received hospitalization and were classified as observation group.Methods:Selenium levels in different pregnancy periods of the same group and the selenium levels in same pregnancy period of the two groups were compared.Pregnancy outcomes and neonatal outcomes of the two groups were compared.Results:The serum selenium level of pregnant women in the third trimester was lower than that in the middle and early trimesters in the two groups ( P<0.05),and the serum selenium level of pregnant women in the second trimester was lower than that in the early trimesters in the observation group ( P<0.05).The incidence of adverse pregnancy outcomes and adverse neonatal outcomes in the observation group were higher than those in the control group.Conclusion:There is a strong correlation between serum selenium and gestational diabetes mellitus,and it is of positive significance for pregnant women to supplement selenium by detecting trace elements during pregnancy.
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    Harmonic Parameter Estimation Based on Classical Cosine Window Three Spectral Line Interpolation FFT
    LI Minghao, WANG Xuming, ZHANG Zhiwei, TAN Yuhao, LEI Kejun
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (3): 38-43.   DOI: 10.13438/j.cnki.jdzk.2022.03.006
    Abstract84)      PDF28)       Save
    Aiming at the problems of spectrum leakage and fence effect in signal processing by fast Fourier transform(FFT),based on the analysis of the characteristics of main-lobe and side-lobe of several classical cosine windows,a harmonic analysis method based on cosine window three spectral line interpolation FFT is proposed by using the spectral lines with the largest amplitude near the real frequency point and the spectral lines on both sides. Combined with the least square and polynomial fitting methods,the correction formula of harmonic parameters is derived.The simulation results show that,compared with the traditional FFT method,the proposed method can better suppress the influence of spectrum leakage and fence effect,and the detection accuracy of harmonic parameters has been further improved.
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    Application of an Optimized NGM (1,1, k) Model in Domestic Energy Consumption
    SHI Jiyu, YU Siyao, YI Yeqing
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (4): 27-33.   DOI: 10.13438/j.cnki.jdzk.2022.04.006
    Abstract83)      PDF36)       Save
    In order to explore the future development trend of domestic energy consumption in China,an optimized NGM(1,1, k) model is developed to study domestic energy consumption in China.The proposed model is applied to the case of China's domestic energy consumption with 2 other grey prediction models respectively,and five indicators commonly used to evaluate the performance of prediction models are used to make comparison.The results of the cases show that the optimized NGM(1,1, k) model shows the best performance in the applied cases,thus confirming the feasibility and validity of the model.At the end of the paper,the metabolic idea is introduced into the proposed model to make a reasonable prediction of China's domestic energy consumption in the next 10 years.
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    Mechanical Properties of Stress Corroded Steel Wire with Cracks
    WANG Xin, DU Siyu, GAO Yang
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (4): 58-66.   DOI: 10.13438/j.cnki.jdzk.2022.04.011
    Abstract82)      PDF32)       Save
    In order to study the tensile mechanical properties of stress corroded high strength galvanized steel wire with cracks,the mechanical model of high strength steel wire with cracks was established based on the data of stress corrosion test,static tensile test,electron microscope test and finite element simulation.The results show that in the static tensile test,the critical failure factor of the steel wire is the crack,and the stress concentration factor of the notch is much higher than that of the corrosion pit.The mechanical property change is caused by further corrosion of the initial crack.When corrosion  is serious,the mechanical properties is mainly determined by the crack and the corrosion pit.
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    Shape Reconstruction Based on Polarization and Coarse Depth Images
    ZHOU Mengyuan, YANG Fenlin
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (4): 20-26.   DOI: 10.13438/j.cnki.jdzk.2022.04.005
    Abstract79)      PDF87)       Save
    Firstly,the coarse depth image is smoothed by bilateral filtering,which can remove noise well while keeping edge details.Then,the depth information is taken as a prior condition to correct the ambiguity of polarization normals by using a self-defined threshold segmentation method.Finally,a penalty function method with depth constraint as the fitting term and polarization normal constraint as the smooth term is constructed,and the least square method is used to calculate the fusion reconstruction.Four polarization images with different polarization angles and a coarse depth map are selected for experiments.The experimental results show that compared with single mode,the fusion of depth and polarization can recover better surface details and achieve better geometric shape effect.
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