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An Improved Whale Optimization Algorithm Based on Levy Flight and Brownian Motion YU Cunwei, MO Liping, WAN Runze Journal of Jishou University(Natural Sciences Edition)    2023, 44 (2): 24-32.   DOI: 10.13438/j.cnki.jdzk.2023.02.004 Abstract （671）      PDF（pc） （1094KB）（347）       Knowledge map    Save A whale optimization algorithm based on Levy flight and Brownian motion is designed to overcome the disadvantages of whale optimization algorithm such as low accuracy,slow convergence and easiness to fall into local optimum.First,Levy flight method is used to initialize the whale population to increase the diversity of the initial population.Then,according to the principle of Brownian motion,the position update of the whale population is randomly perturbed to avoid the algorithm falling into local optimization in advance.The improved whale optimization algorithm is compared with whale optimization algorithm,particle swarm optimization algorithm,genetic algorithm and ant colony optimization algorithm on seven different benchmark test functions.The experimental results show that the improved whale optimization algorithm is superior to the other four algorithms in terms of solution accuracy and convergence speed.At the same time,simulation and comparison experiments are carried out on the initial solution exploration range of the improved whale optimization algorithm using Levy flight strategy and the whale optimization algorithm using random search strategy in the initialization stage.The experimental results show that the improved whale optimization algorithm can avoid falling into local optimization in a certain program. Reference | Related Articles | Metrics | Comments（0）

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Current Situation and Measures of Drum Dance Development of Miao Ethnic Group in Western Hunan Province:Activation and  Inheritance of Intangible Cultural Heritage XIA Chenchen Journal of Jishou University(Natural Sciences Edition)    2022, 43 (6): 92-96.   DOI: 10.13438/j.cnki.jdzk.2022.06.016 Abstract （667）      PDF（pc） （433KB）（244）       Knowledge map    Save Drum dance of Miao ethnic group in western Hunan province is a national-level intangible cultural heritage with representative inheritors at the national,provincial,state,county and municipal levels.The project has been well protected,and has been well applied in ethnic and folk cultural and sports activities,school sports,tourism development and foreign cultural exchanges.However,there are still serious problems such as the aging of inheritors,the imperfect inheritance mechanism,and the challenges from modern entertainment.In order to improve the protection and inheritance effect of the drum dance,some measures need to be taken,such as cultivation of inheritors,creating demonstration area of "two innovation",and diversified and coordinated development. Reference | Related Articles | Metrics | Comments（0）

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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 Abstract （649）      PDF（pc） （323KB）（443）       Knowledge map    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. Reference | Related Articles | Metrics | Comments（0）

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Reflection Model of Lambert Surface in Three Light Sources XU Xuemei, YANG Fenlin Journal of Jishou University(Natural Sciences Edition)    2023, 44 (1): 30-33.   DOI: 10.13438/j.cnki.jdzk.2023.01.005 Abstract （607）      PDF（pc） （437KB）（211）       Knowledge map    Save In order to idealize the reflection model of object surface,the scene radiance of the Lambertian object illuminated by the strip light source,the uniform light source and the hemispherical uniform light source is derived by the radiance and the spherical triangle formula,and then the Lambertian surface reflection model in three kinds of light sources is obtained. Reference | Related Articles | Metrics | Comments（0）

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Investigation of the Mechanism of Coptis chinensis for the Treatment of COVID-19 Based on Network Pharmacology and Molecular Docking FENG Bijun Journal of Jishou University(Natural Sciences Edition)    2022, 43 (5): 64-73.   DOI: 10.13438/j.cnki.jdzk.2022.05.011 Abstract （560）      PDF（pc） （10961KB）（116）       Knowledge map    Save Based on network pharmacology and molecular docking,the mechanism of coptis chinensis for the treatment of COVID-19 has been investigated.The Chinese herbal medicine systems pharmacology platform (TCMSP) was used to screen the active components and targets of Coptis chinensis.GeneCards and OMIM screened the disease targets of COVID-19,R screened the common targets of drugs and diseases,and Cytoscape constructed a "drug-active ingredient- target-disease” interaction network,STRING constructed a common target protein interaction network,ClueGo performed gene function analysis for common targets,and R performed Kyoto Encyclopedia of Genes and Genomes pathway enrichment analysis for common targets.Then molecular docking was performed between the core components of Coptis chinensis active components and the main targets for the treatment of COVID-19.The preliminary exploration obtained 14 active ingredients of Coptis chinensis with 235 targets and 341 genes related to COVID-19.The key targets of Coptis chinensis in the treatment of COVID-19 include VEGFA,IL6,POR,and PLAT.Molecular docking results showed that the core compound of Coptis chinensis has a certain affinity for VEGFA,IL6,POR,and PLAT. Reference | Related Articles | Metrics | Comments（0）

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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 Abstract （553）      PDF（pc） （445KB）（113）       Knowledge map    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. Reference | Related Articles | Metrics | Comments（0）

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Analysis of the Coagulant Activity and Chemical Components in Artemisia annua L. ZHAO Fafa, ZHANG Xiaorong Journal of Jishou University(Natural Sciences Edition)    2022, 43 (5): 30-36.   DOI: 10.13438/j.cnki.jdzk.2022.05.005 Abstract （534）      PDF（pc） （2305KB）（131）       Knowledge map    Save The pharmacodynamics substance in Artemisia annua L.was studied.The hemostasis chemical compositions were extracted by the organic solvent extraction method in Artemisia annua L..The hemostasis medicinal effect of the extract from Artemisia annua L.was detected using the coagulation plate method,the test tube method and the plasma recalcification time measurement method.The flavone compounds were separated from the butyl alcohol extract using Alkali dissolution-acid precipitation method.The spectroscopic properties were detected by the ultraviolet-visible spectroscopy and the fluorescence spectroscopy.And the flavone compounds were identified of the physical and chemical properties.The terpenoids compounds were separated from the butyl alcohol extract by the low temperature method,and were analyzed using the thin layer chromatography (TLC).The results indicated that the butyl alcohol extract was the hemostasis pharmacodynamics substance in Artemisia annua L..The clotting effect was significant of the butyl alcohol extract tested by the three methods of the coagulation plate method,the test tube method and the plasma recalcification time measurement method.And the chemical composition analysis showed that a lot of flavone compounds and the terpenoids compounds were contained in the butyl alcohol extract.It can be concluded that the pharmacodynamics substance is the butyl alcohol extract from Artemisia annua L.,and the major chemical constituents include the flavone compounds and the terpenoids compounds. Reference | Related Articles | Metrics | Comments（0）

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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 Abstract （523）      PDF（pc） （509KB）（119）       Knowledge map    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. Reference | Related Articles | Metrics | Comments（0）

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Effect of Nimotuzumab Combined with GP Chemotherapy in the Treatment of Metastatic Nasopharyngeal Carcinoma CHEN Jia, XIANG Zhibi, XIONG Li, DUAN Hexin, LIU Rong, YANG Zhi, WU Hui, YANG Zaichuan Journal of Jishou University(Natural Sciences Edition)    2022, 43 (6): 67-74.   DOI: 10.13438/j.cnki.jdzk.2022.06.012 Abstract （521）      PDF（pc） （981KB）（107）       Knowledge map    Save The efficacy and adverse reactions of nituzumab combined with GP chemotherapy in the treatment of metastatic nasopharyngeal carcinoma has been analyzed.Patients diagnosed by the pathology and the imaging of advanced metastatic nasopharyngeal carcinoma from June 1,2019 to December 31,2020 in Xiangxi Autonomous Prefecture People's Hospital,and were randomly divided into experimental group (GP + Nimotuzumab)and control group (GP) .The effective rate,disease control rate,progression-free survival,overall survival and adverse reactions of the two groups were compared and analyzed.A total of 28 patients were included in this study,including 14 in the experimental group and 14 in the control group.In the experimental group there were 1 case of CR,10 cases of PR,2 cases of SD,and 1 case of PD;and in the control group,ORR of the experimental group and control group was 78.5% vs 50.0%(P=0.115),and DCR 92.8% vs 85.7%(P=0.541).The median DOR was 7 months in the experimental group and 5 in the control group (P=0.068).The median PFS of the experimental group and the control group were 11 months and 7 months (P=0.043).The median OS was 19 months in experimental group and 13 months in control group (P=0.043) .The main adverse reactions in both groups were myelosuppression,gastrointestinal reactions and hepatic injury.Degrees of myelosuppression occurred in 11 patients in the experimental group and in 12 in the control group (P=0.662).The rates of grade 1~2 myelosuppression in the two groups were 50.00% vs 25.00% (P=0.115),while 3~4 grade in the two groups were (33.33% vs 64.28%,P=0.058).Grade 1~2 gastrointestinal reactions occurred in both groups 35.71% vs 50.00% (P=0.445).The incidence of grade 1~2 hepatic injury was (21.43% vs 7.14%,P=0.280),and that of grade 3~4 hepatic injury was the same (7.14%) .Compared with GP alone,GP +Nimotuzumab did not improve the short-term efficacy in the treatment of advanced metastatic nasopharyngeal carcinoma,but prolonged the PFS time,improved the overall survival,and did not increase the adverse reactions. Reference | Related Articles | Metrics | Comments（0）

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Improved of Source Code Plagiarism Detection Based on Abstract Syntax Tree LIU Feixiang, LONG Dongdong, OU Xingru, CHEN Changfeng Journal of Jishou University(Natural Sciences Edition)    2022, 43 (6): 20-25.   DOI: 10.13438/j.cnki.jdzk.2022.06.005 Abstract （515）      PDF（pc） （371KB）（172）       Knowledge map    Save For low detection accuracy and inability to detect plagiarism at the semantic level in the traditional abstract syntax tree based code plagiarism detection methods,an improved code plagiarism detection approach based on abstract syntax tree is designed.This approach achieves higher plagiarism detection rate through TF-IDF weighted simplified syntax tree.Moreover,feature extraction and similarity calculation methods based on weighted simplified abstract syntax tree are designed to realize partial detection of semantic plagiarism.Experimental results show that the proposed approach can effectively detect semantic level plagiarism and achieves higher accuracy than traditional tree-based methods. Reference | Related Articles | Metrics | Comments（0）

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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 Abstract （511）      PDF（pc） （4462KB）（216）       Knowledge map    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. Reference | Related Articles | Metrics | Comments（0）

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Literature Research and Explanation of Ethnic Medicine Radix et Caulis Flemigiae,Radix et Caulis Zanthoxyli,Radix et Caulis Rosae YANG Dequan Journal of Jishou University(Natural Sciences Edition)    2023, 44 (1): 84-89.   DOI: 10.13438/j.cnki.jdzk.2023.01.012 Abstract （498）      PDF（pc） （483KB）（130）       Knowledge map    Save The names,sources,properties,major functions,and clinical applications of Radix et Caulis Flemigiae,Radix et Caulis Zanthoxyli,and Radix et Caulis Rosae are researched in ethnic medicine literature on herbalism.According to the existing standard.the three medicines are the commonly used traditional Chinese medicine (TCM) among the ethnic people of Tujia,Miao,Dong,Yao,Zhuang and other ethnic people. Reference | Related Articles | Metrics | Comments（0）

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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 Abstract （495）      PDF（pc） （548KB）（117）       Knowledge map    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%. Reference | Related Articles | Metrics | Comments（0）

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Approach to a High-Level,In-Depth,and Affectionate Curriculum of Ideological and Political Education in Foreign Language Teaching for Medical Students LIU Rurong, LIU Qijun Journal of Jishou University(Natural Sciences Edition)    2022, 43 (6): 87-91.   DOI: 10.13438/j.cnki.jdzk.2022.06.015 Abstract （494）      PDF（pc） （411KB）（114）       Knowledge map    Save It is the fundamental task of strengthening moral education and cultivating people and also the new commission of institutions of higher education to change from proving ideological and political courses to practicing curriculum of ideological and political education.Universities should cultivate students with good values and moral integrity,giving full play to each course.Due to the special nature of foreign language course and the utilitarian purpose of medical students,a high-level,in-depth,and affectionate curriculum of ideological and political education in foreign language teaching is essential for them.To achieve this,we need to perfect course teaching plan,strengthen teaching staff,and optimize teaching mode.Only by creatively transforming from special personnel to everyone in ideological and ideological education,and virtually integrating explicit education with implicit education,can curriculum ideological and political education be truly implemented. Reference | Related Articles | Metrics | Comments（0）

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Method for Solving the Abel Integral Equation of the Downline Problem XING Jiasheng Journal of Jishou University(Natural Sciences Edition)    2022, 43 (6): 6-10.   DOI: 10.13438/j.cnki.jdzk.2022.06.002 Abstract （492）      PDF（pc） （326KB）（148）       Knowledge map    Save For the solution of the downline problem with a given descent time function，the problem is transformed into an Abel integral equation solution problem.For the integral equation on infinite interval,this paper introduces Abel's method and the process of solving integral equation with Laplace transformation,and gives the solution formula.For the limited range of integral equation,this paper uses the Abel integral transformation method to solve the integral equation,uses the iterated integral to exchange integral sequence,and obtains the solution formula from a definite integral identity.The solution formula of the integral equation is applied to the isochronous curve problem.The isochron is proved be an inverted cycloid with the solution of  the differential equation of the isochronous curve problem. Reference | Related Articles | Metrics | Comments（0）

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Study on Traditional Medicinal Preparation Technology of Jixiang Cough Ointment LI Jin, LUO Yuanqiang, WU Yizhen, PENG Yong, HUANG Li Journal of Jishou University(Natural Sciences Edition)    2022, 43 (5): 83-88.   DOI: 10.13438/j.cnki.jdzk.2022.05.013 Abstract （475）      PDF（pc） （414KB）（140）       Knowledge map    Save The standard for traditional medicinal preparation technology of Jixiang cough ointment has been established.The extraction rate (dry extract) reached 96.21% through three times of decoction with drinking water for 2 hours,2 hours,and 1 hour respectively.The extracts were filtered and combined for three times,and concentrated in the low-temperature hot reflux extraction and concentration equipment to obtain clear paste with a relative density of 1.15~1.25.A proper amount of rock sugar was boiled with water to make honeycomb-like syrup.When the relative density of syrup was greater than 1.4 (80 ℃),clear paste was added (the ratio of clear paste to syrup was 1∶1.5),and the paste was collected at normal pressure.The paste was concentrated with relative density 1.25~1.40,with addition of 0.1% potassium sorbate,and then was encapsulated.The extraction,concentration,sugar refining,paste collection,and paste collecting processes of Jixiang cough ointment are compatible with the equipments in the preparation room.It is a traditional Chinese medicinal preparation.The quality of the finished products is stable and meets the requirements,and it can be produced in the hospital preparation room.The preparation process is stable,simple,reproducible,and effective. Reference | Related Articles | Metrics | Comments（0）

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Legal Protection of Broadcasting Right of Sports Events in the Internet Age TANG Zijun, SUN Yingqi Journal of Jishou University(Natural Sciences Edition)    2023, 44 (1): 93-96.   DOI: 10.13438/j.cnki.jdzk.2023.01.014 Abstract （472）      PDF（pc） （358KB）（91）       Knowledge map    Save The sports industry has become the pillar industry of China's national economy.Among them,the sports event broadcasting industry,which is generated by the broadcasting of sports events through emerging media such as TV and the Internet,is an important part of it.The broadcasting right of sports events is the core right of the sports event broadcasting industry.However,in practice,there are many disputes surrounding it,and the legal protection is insufficient.Relevant legal provisions are scattered in copyright law,contract law,anti-unfair competition law and other laws.Therefore,in order to promote the healthy development of sports industry in China,relevant legislation should be accelerated.The broadcasting right of sports events should be included in the protection of intangible property rights,and in the regulation of broadcasting organization rights,thereby creating a strong legal protection mechanism. Reference | Related Articles | Metrics | Comments（0）

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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 Abstract （471）      PDF（pc） （509KB）（85）       Knowledge map    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. Reference | Related Articles | Metrics | Comments（0）

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Preparation of Li4Ti5O12 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 Abstract （470）      PDF（pc） （7320KB）（210）       Knowledge map    Save Li4Ti5O12 powders were prepared by solid-state reaction and two-step calcination method with Li2CO3 and TiO2 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 Li4Ti5O12 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 Li4Ti5O12 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. Reference | Related Articles | Metrics | Comments（0）

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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 Abstract （464）      PDF（pc） （379KB）（93）       Knowledge map    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. Reference | Related Articles | Metrics | Comments（0）

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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 Abstract （463）      PDF（pc） （335KB）（199）       Knowledge map    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. Reference | Related Articles | Metrics | Comments（0）

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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 Abstract （456）      PDF（pc） （315KB）（184）       Knowledge map    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. Reference | Related Articles | Metrics | Comments（0）

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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 Abstract （455）      PDF（pc） （360KB）（127）       Knowledge map    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. Reference | Related Articles | Metrics | Comments（0）

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Improved YOLOv4 Lung Nodule Detection Algorithm LIN Kunhuang, LI Jianfeng, WANG Yang, LIU Zhijie, LIU Zheyu Journal of Jishou University(Natural Sciences Edition)    2023, 44 (1): 24-29.   DOI: 10.13438/j.cnki.jdzk.2023.01.004 Abstract （453）      PDF（pc） （4395KB）（161）       Knowledge map    Save An improved YOLOv4 lung nodule detection algorithm is designed to solve the problems of small target missing detection and lung nodule position distortion in the target detection YOLOv4 algorithm.On the basis of the original YOLOv4 network,the up sampling process of the feature fusion network is replaced by the bilinear interpolation method,and the tensor stacking method is used to make the semantic information of the top layer and the location information of the bottom layer to form a higher channel feature tensor.The experimental results show that,compared with the original YOLOv4 algorithm,the average accuracy and prediction speed of the improved YOLOv4 algorithm on the public dataset LUAN16 are improved by 4.54% and 28.1% respectively,and the visualization results have more accurate position expression. Reference | Related Articles | Metrics | Comments（0）

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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 Abstract （452）      PDF（pc） （1996KB）（165）       Knowledge map    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. Reference | Related Articles | Metrics | Comments（0）

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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 Abstract （450）      PDF（pc） （398KB）（85）       Knowledge map    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. Reference | Related Articles | Metrics | Comments（0）

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Logic,Dilemma and Path of Media Integration Development of Medical Journals GUO Xiaoya Journal of Jishou University(Natural Sciences Edition)    2022, 43 (6): 80-86.   DOI: 10.13438/j.cnki.jdzk.2022.06.014 Abstract （445）      PDF（pc） （441KB）（121）       Knowledge map    Save Media integration has become an important means for medical journals to enhance their academic content and influence.In essence,media integration plays an important role in improving the academic capacity of medical journal editors,expanding the dissemination channels of medical journals,and improving the academic influence of medical journals.However,limited by many factors,the media integration of medical journals is still facing difficulties such as low development orientation,insufficient content innovation and shortage of professional personnel,which seriously affects the sustainable development of medical journals.Therefore,it is proposed that medical journals should focus on the new development trend of " Internet + Media ",orientate the development direction of media integration of medical journals with high standards,build the characteristic brand of media integration development of medical journals,and establish a team of medical journal media integration professionals,so as to finally realize the high integration development of medical journals and new media. Reference | Related Articles | Metrics | Comments（0）

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Extraction of Bletilla striata Polysaccharides and Detection of its Antibacterial Activity LUO Lingli, KUANG Yongbin, YU Xi, ZHANG Tao, FENG Qiuju Journal of Jishou University(Natural Sciences Edition)    2022, 43 (5): 37-42.   DOI: 10.13438/j.cnki.jdzk.2022.05.006 Abstract （439）      PDF（pc） （2796KB）（108）       Knowledge map    Save Bletilla striata polysaccharides were extracted by water extraction and alcohol precipitation,with different ratio of material to liquid,extraction temperature and extraction time as the research conditions and the extraction content as the index of orthogonal experiment,so as to determine the best extraction technology.Under the optimum conditions,the extracted polysaccharides were added to the ointment to make Bletilla striata ointment.The inhibitory effects of Bletilla striata polysaccharide and Bletilla striata ointment on the growth of Escherichia coli and Staphylococcus aureus were determined by filter paper diffusion method.The results showed that the optimum extraction conditions were as follows:the ratio of material to liquid was 1:35 (g:mL),the extraction temperature was 80 ℃ and the extraction time was 4.0 h.Under these extraction conditions,the yield of polysaccharide was 25.97%.When the mass concentration of Bletilla striata polysaccharide reached 0.33 g/mL,it had inhibitory effect on Escherichia coli and Staphylococcus aureus.When the mass concentration was increased to 0.66 g/mL,the bacteriostatic effect of polysaccharide extract was stronger,and the bacteriostatic effect on Escherichia coli was better than that of commercial Yifubaiying bacteriostatic paste.The performance of Bletilla striata ointment was stable and the bacteriostatic effect against Escherichia coli was stronger than Staphylococcus aureus. Reference | Related Articles | Metrics | Comments（0）

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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 Abstract （436）      PDF（pc） （610KB）（235）       Knowledge map    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. Reference | Related Articles | Metrics | Comments（0）

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Comprehensive Evaluation and Spatial Distribution Characteristics of Soil Fertility in Xiangxi Prefecture PENG Huan, ZHOU Ying, ZENG Hanyong, LUO Jin, LI Qiang, HE Jianwu Journal of Jishou University(Natural Sciences Edition)    2022, 43 (6): 38-44.   DOI: 10.13438/j.cnki.jdzk.2022.06.008 Abstract （433）      PDF（pc） （12300KB）（172）       Knowledge map    Save The comprehensive evaluation of soil fertility in Xiangxi autonomous Prefecture provides a basis for improving soil fertility and building high-quality farmland.Soil pH,organic matter,total nitrogen,available phosphorus,and available potassium were selected as evaluation indicators，combined with the index summation method,a comprehensive evaluation system of soil fertility is constructed,and the soil fertility is comprehensively evaluated.The results showed that the soil pH in Xiangxi Prefecture is acid,there is slight soil acidification,the content of organic matter is high,the content of total nitrogen is moderate,the content of available phosphorus and available potassium vary greatly,and the average content was high.The proportion of soil area with grade I,II,III and IV fertility in Xiangxi Prefecture was 17.66%,17.62%,8.21% and 56.51% respectively. Reference | Related Articles | Metrics | Comments（0）

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Microscopic Characteristics and TLC Identification of Tujia Herbal Medicine Viola diffusa SHE Yonghong, YANG Dequan Journal of Jishou University(Natural Sciences Edition)    2022, 43 (5): 10-13.   DOI: 10.13438/j.cnki.jdzk.2022.05.002 Abstract （433）      PDF（pc） （6654KB）（122）       Knowledge map    Save The microscopic structure and TLC identification of Tujia herbal medicine Viola diffusa were studied.Viola diffusa was selected as the control to establish TLC identification method.The method is simple to operate and can be used for the quality control of Viola diffusa herb. Reference | Related Articles | Metrics | Comments（0）

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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 Abstract （431）      PDF（pc） （2291KB）（208）       Knowledge map    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. Reference | Related Articles | Metrics | Comments（0）

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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 Abstract （430）      PDF（pc） （3410KB）（97）       Knowledge map    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. Reference | Related Articles | Metrics | Comments（0）

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Research on Gastrointestinal Toxicity Evaluation of Dichroa Alkali Salt in Zebrafish LI Sidi, YE Zuguang, ZENG Xingyao, ZHOU Minggao, TAN Xiaowen, FAN Taiping, TAN Xinxin, SHENG Yihua Journal of Jishou University(Natural Sciences Edition)    2022, 43 (5): 56-63.   DOI: 10.13438/j.cnki.jdzk.2022.05.010 Abstract （428）      PDF（pc） （8453KB）（83）       Knowledge map    Save To systematically analyze the gastrointestinal toxicity of dichroa alkali salt and explore the model animals suitable for such toxic drugs,the LC10 and MNLC of dichroa alkali salt in zebrafish were observed.The intestinal effects of dichroa alkali salt were evaluated by the zebrafish model,including evaluation of intestinal peristalsis inhibition,intestinal phenotype,and tissue pathology of intestinal tract.Results showed that the LC10 and MNLC of dichroa alkali salt on zebrafish were about 10 μg/mL and 5 μg/mL,respectively.Zebrafish were treated by dichroa alkali salt with concentration of 0.5,1.67,5 and 10 μg/mL,and the intestinal contents of zebrafish increased significantly.The inhibition rates of intestinal peristalsis were 27.78%,61.11%,77.11% and 80.89%,respectively,which showed that all concentrations of dichroa alkali salt has obvious inhibitory effect on the intestinal peristalsis of zebra fish.The intestinal toxicity phenotype and histopathological observation showed that under the conditions of 0.5,1.67,5 and 10 μg/mL salt treatment,the intestinal folds were reduced or disappeared,the intestinal mucosa cells were denaturated,the intestinal mucosa was destroyed,the intestinal lumen was blurred,and the intestinal lumen was narrowed,and the severity was positively correlated with the incidence.Above all,dichroa alkali salt presents definite gastrointestinal toxicity.Zebrafish can be used as a model animal to systematically study the toxic effects and characteristics of gastrointestinal toxic drugs. Reference | Related Articles | Metrics | Comments（0）

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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 Abstract （427）      PDF（pc） （7135KB）（81）       Knowledge map    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. Reference | Related Articles | Metrics | Comments（0）

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Thin Layer Chromatographic Identification of Cynanchum otophyllum Decoction Pieces and the Standard Limit of Extraction Inspection YANG Dequan, SHE Yonghong, JI Linfang, DING Ye Journal of Jishou University(Natural Sciences Edition)    2022, 43 (5): 43-46.   DOI: 10.13438/j.cnki.jdzk.2022.05.007 Abstract （426）      PDF（pc） （2419KB）（88）       Knowledge map    Save A thin layer chromatographic identification method was established for decotion pieces of Cynanchum otophyllum.This method takes decotion pieces of Cynanchum otophyllum as the test sample,uses silica gel G thin layer plate,uses Cynanchum otophyllum as the control drug,uses ultrasonic treatment to prepare the test solution and the reference drug solution for 30 min,and uses cyclohexane ether butyl acetate glacial acetic acid (20∶6∶3∶0.2) as the developing agent.Under ultraviolet light (365 nm),the results showed that the chromatograms of 15 batches of decotion pieces of Cynanchum otophyllum were consistent with the chromatograms of Cynanchum otophyllum reference materials.This thin layer chromatographic method is stable and simple,and can be used to identify decotion pieces of Cynanchum otophyllum.According to the cold leaching method specified in the Chinese Pharmacopoeia (2020),the water-soluble extracts of 15 batches of decotion pieces of Cynanchum otophyllum were 15.55%~22.96%.Therefore,it is recommended that the limit of detection of the extracts of decotion pieces of Cynanchum otophyllum should be "not less than 15.0%". Reference | Related Articles | Metrics | Comments（0）

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Design and Optimization of Permission Control System with Distributed Architecture LEI Yunxiang, JIANG Qihai, TIAN Jie, DUAN Mingxiu Journal of Jishou University(Natural Sciences Edition)    2022, 43 (6): 26-31.   DOI: 10.13438/j.cnki.jdzk.2022.06.006 Abstract （416）      PDF（pc） （1010KB）（178）       Knowledge map    Save Aiming at the low performance and difficult maintenance of traditional permission control system,a new distributed permission management system based on JSON Web Token(JWT) technology is designed and implemented.The system adopts the mode of "centralized authentication and decentralized identification",which improves the overall performance and efficiency of the system. Reference | Related Articles | Metrics | Comments（0）

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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 Abstract （415）      PDF（pc） （18201KB）（66）       Knowledge map    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. Reference | Related Articles | Metrics | Comments（0）

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Global Polynomial Stabilization of Proportional Delayed Neural Networks WANG Yu, ZHANG Shiru, ZHANG Yuji, ZHOU Liqun Journal of Jishou University(Natural Sciences Edition)    2022, 43 (3): 15-25.   DOI: 10.13438/j.cnki.jdzk.2022.03.003 Abstract （408）      PDF（pc） （1070KB）（126）       Knowledge map    Save For a class of proportional delayed neural networks,a state feedback controller is used.With the condition that the activation function is bounded and satisfies the Lipschitz condition,we analyze the global polynomial stabilization (GPS) and global asymptotic stabilization (GAS) of the studied system are analyzed by constructing appropriate Lyapunov functionals and using mean value inequality and inequality analysis skills.Several delay-dependent GPS and GAS conditions are obtained. Reference | Related Articles | Metrics | Comments（0）

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Study on Plant Resources of Military Materia Medica in Western Hunan (Ⅳ):Investigation and Analysis of Poisonous Plant Resources XIAO Meiqi, LI Zhen, LI Zhenhui, ZHANG Yangyang, XIANG Xiaomei, CHEN Gongxi Journal of Jishou University(Natural Sciences Edition)    2022, 43 (5): 20-29.   DOI: 10.13438/j.cnki.jdzk.2022.05.004 Abstract （405）      PDF（pc） （903KB）（199）       Knowledge map    Save In order to enrich the military herbal resource database in western Hunan,and better develop and utilize the materia medica resources for military purposes,the toxic plant resources of military materia medica in Xiangxi Autonomous Prefecture,Zhangjiajie City and its surrounding areas were statistically analyzed through field investigation and literature review.The results show that there are 203 species,belonging to 136 genera and 67 families of poisonous plants in Western Hunan;life habits are mainly of perennial herbs.The habitat is dominated by forest.As for the distribution,the number of poisonous plants increases first and then decreases with the increase of elevation.In the horizontal distribution,the abundance of poisonous plants in the northwest of Hunan is higher than that in the south.The differentiation of geographical elements from the family level to the genus level and then to the species level has gradually become larger.At the family level,most of the poisonous plants in western Hunan can be found around the world;at the genus level,most of them are distributed in the north temperate zone;at the species level,the dominant species are of east Asian species (endemically distributed in China).The majority of toxic plants are of whole-part toxic plants with small toxicity.The toxicological effects are mainly nervous system toxicity and mucosal irritation toxicity. Reference | Related Articles | Metrics | Comments（0）