Journal of Jishou University(Natural Sciences Edition)

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25 July 2024, Volume 45 Issue 4

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Mathematics

Existence of Multiple Positive Periodic Solutions of a Delay Functional Difference System

ZHU Xianyang

Journal of Jishou University(Natural Sciences Edition), 2024, 45(4): 1-4.

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With a fixed point theorem on a cone in Banach space,the sufficient conditions of the existence of multiple positive periodic solutions are investigated for a delay difference system with feedback control argument.

Existence of Pulse Solutions for the Quintic Real Ginzburg-Landau Equation with Coupled Slow Diffusion Mode

BIN Qun, OUYANG Yuting, DU Chaoxiong

Journal of Jishou University(Natural Sciences Edition), 2024, 45(4): 5-10.

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Utilizing Fenichel's geometric singular perturbation theory,we transform the problem of pulse solution existence for a coupled subcritical quintic real Ginzburg-Landau equation with slow diffusion mode into a geometric perturbation scenario,showing the transversality between critical manifolds.Through the computation of the Melnikov function's zeros on the critical manifolds,the presence of homoclinic orbits is further confirmed.Ultimately,it is demonstrated that,under specific parameter conditions,the subcritical quintic Ginzburg-Landau equation with slow diffusion exhibits pulse solutions.

Influence of c-Normality on p-Solvability of Finite Groups

JIA Lei, LUO Xiaoliang

Journal of Jishou University(Natural Sciences Edition), 2024, 45(4): 11-14.

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The necessary and sufficient condition for finite groups to be p-nilpotent groups is given by using c-normality,and two sufficient conditions for finite groups G to be p-supersolvable groups are obtained by investigating the c-normality of Sylow subgroups and their maximal subgroups.

The Second Order Adaptive Moving Mesh Method for a Singularly Perturbed Fredholm Integro-Differential Equation

LUO Dan, MAO Zhi

Journal of Jishou University(Natural Sciences Edition), 2024, 45(4): 15-25.

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An exponentially fitted finite difference scheme constructed by the base function method and the compound trapezoidal formula is applied to make discrete a class of singularly perturbed Fredholm integral differential equation.Combining the truncation error estimate,the boundary estimate and the stability analysis,the second order uniform convergence in the infinity norm with respect to the perturbation parameter for the adaptive moving mesh method is proved.Based on the above theoretical analysis,the algorithm to produce the mesh is designed.

Computer and Automation

Non-Interference Identification Method of IoT Terminals Based on One-Dimensional Convolution Neural Network

YANG Meng

Journal of Jishou University(Natural Sciences Edition), 2024, 45(4): 26-31.

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In view of the problem that IoT terminals are vulnerable to interference in the identification process,a non-interference identification method of IoT terminals based on one-dimensional convolution neural network is proposed.Acceleration data for different gaits are collected through the built-in acceleration sensor of the Internet of Things terminal and preprocessed through smoothing and windowing processing.Gait data fusion model is used to analyze user data under different behavior-position combinations,and random forest model is used to predict the position of IoT terminals and target data behavior.Behavioral target data are integrated with positional data to obtain gait fusion data.On this basis,a one-dimensional convolutional neural network model is constructed,which takes the fused data as input and outputs the user's identity recognition results after iterative training.The experimental results show that the non-interference identity recognition method for IoT terminals based on one-dimensional convolutional neural networks can accurately identify the identity of IoT terminal users in appropriate model parameter conditions.

Fault Diagnosis of High-Voltage AC Transmission Lines Based on Wavelet Packet Transform and XGBoost

PAN Min, WANG Xuming, SUN Longfei, LEI Kejun, YANG Xi

Journal of Jishou University(Natural Sciences Edition), 2024, 45(4): 32-40.

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In view of the short-circuit fault situation of high-voltage AC transmission line,the three-phase AC voltage and current signals are transformed into wavelet packets to extract the fault features,and then the extracted features are input into the XGBoost model for fault diagnosis.The experimental results show that the fault identification accuracy of the fault diagnosis method based on wavelet packet transform and XGBoost is 99.6% for the fault of high-voltage AC transmission line under different operating conditions.Compared with other machine learning models,this method has high accuracy.

Automobile Anti-Lock Brake System Fuzzy Variable Structure Control

CHEN Dezheng, WANG Shinong, GU Huangyi

Journal of Jishou University(Natural Sciences Edition), 2024, 45(4): 41-49.

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For the problem of insufficient use of the ground adhesion coefficient and high nonlinearity of the Anti-lock Braking System (ABS) in the process of automobile braking,a road surface recognition algorithm is designed based on Burckhardt's tyre model,and the optimal slip rate detected by the road surface recognition algorithm is fed into the fuzzy variable structure control,so as to propose a fuzzy variable structure control strategy for ABS based on road surface detection.The results of the simulation experiments show that the road surface recognition algorithm has fast response and high accuracy;under the conditions of variational road surface,the fuzzy variable structure control reduces the braking time by 7% and the braking distance by 6% compared with the variable structure control,and the amplitude of the jitter vibration of the controller output is effectively attenuated.

Biological

Genetic Diversity of Rhodeus Ocellatus from Lancang River of Yunnan

LI Rong, NING Yanhong, MENG Feiyan, XU Weijiang, TIAN Hanji, FAN Lixian

Journal of Jishou University(Natural Sciences Edition), 2024, 45(4): 50-58.

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To investigate genetic diversity of Rhodeus ocellatus from Lancang River of Yunnan,this study applied PCR amplification and sequencing methods to determine the mitochondrial COI gene sequence fragments of 10 R. ocellatus samples from Xishuangbanna.Additionally,we combined with the homologous sequence of COI gene of six Rhodeus species from GenBank database to execute the genetic diversity,genetic distance and phylogenetic analyses.Sequence analyses showed that the COI gene sequence fragments was 657 bp,the base composition A+T content (52.5%) was larger than the G+C content (47.5%),and there were 21 variable sites and 4 haplotypes.The haplotype diversity of R. ocellatus was 0.711,the nucleotide diversity was 0.008 2,the average nucleotide difference was 5.400,and the Tajima's D value was -1.353 78 (P>0.10).The minimum genetic distance between our R. ocellatus samples and R. ocellatus from Baoshan city was 0.005,and the maximum genetic distance between R. ocellatus samples and R. notatus was 0.196.Phylogenetic analysis showed that R. ocellatus samples were clustered into a monophyletic branch with the same sequence published from Baoshan city with high bootstrap value (100%).Furthermore,the R. amarus,R. colchicus and R. meridionalis samples clustered together as a monophyletic clade,while R. notatus and R. uyekii samples were gathered to form a monophyletic branch.

Investigation and Analysis of Threatened Plants in Baojing County

JIANG Long, CHEN Dahua, JIANG Mei, ZHANG Daigui

Journal of Jishou University(Natural Sciences Edition), 2024, 45(4): 59-66.

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To grasp the current situation of threatened plants in Baojing County,methods such as field investigation,specimen collection and organization,and literature review were adopted to investigate and analyze the threatened plants of the area.The results show that there were 70 species of threatened plants in 36 families,55 genera,of which 4 were critically endangered,21 were endangered,and 45 were vulnerable.Among the categories,angiosperms were the most threatened.In the composition of family and genus,the threatened plants mainly belong to single species and single species.In the composition of life forms,the threatened plants were mainly herbaceous plants.The floristic composition of threatened plant genera is complex,their origin and development are closely related to tropical distribution,and East Asian components are prominent,showing subtropical characteristics.The population of threatened plants is normally distributed,and the geographical distribution is unbalanced.Habitat degradation or loss and direct harvesting and felling are the main risk factors for threatened plants.Three protected areas in Baojing County provide effective protection for threatened plants.

Chemistry

Preparation and Electrochemical Properities of Cathode Material Li3V2-xCox(PO4)3 for Aqueous Hybrid Battery

WANG Wei, PI Shengdong, WANG Cheng, SUN Yan, XIONG Lizhi, XIANG Yanhong

Journal of Jishou University(Natural Sciences Edition), 2024, 45(4): 67-75.

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In this design,Li₃V_2-xCo_x(PO₄)₃ materials were synthesized by freeze-drying assisted sol-gel method,with ammonium metavanadate,lithium acetate dihydrate,and ammonium dihydrogen phosphate as raw materials,and cobalt acetate tetrahydrate as Co doping source.The effect of Co doping on the structural and electrochemical properties of the materials was investigated.The results show that Monoclinic crystals with good crystallinity can be obtained by freeze-drying assisted sol-gel method,and the crystal structure of lithium vanadium phosphate is not changed by proper Co doping.The positive electrode materials synthesized by freeze-drying assisted sol-gel have microporous structure.The proper amount of Co doping helps to increase the number of micropores and obtain the material with more uniform particle size.With the increase of Co doping amount,the ion diffusion rate,charge/discharge and cycling performance of the materials all presents a trend of first increasing and then decreasing,while the charge transfer impedance presents a trend of first decreasing and then increasing.When x=0.04,the electrochemical performance of the lithium vanadium phosphate cathode material is the best,the ion diffusion rate reached 8.99×10^-13 cm/s,the charge transfer impedance is the lowest,233.6 Ω,and the initial discharge capacity increases from undoped 53.4 mAh/g to 81.7 mAh/g at 2C discharge rate.After 50 weeks of 2C rate cycle,the discharge capacity retention rate is 91.11%,which is 13.54% higher than that of the undoped sample.

Determination of Levofloxacin on Carboxylated Multi-Wall Carbon Nanotubes Modified Glassy Carbon Electrode

WANG Ying, MA Dongyun, SHEN Jinghui, JING Wenhui, ZHAO Liman, YUAN Huan, LI Bingyin

Journal of Jishou University(Natural Sciences Edition), 2024, 45(4): 76-81.

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Electrochemical behavior of levofloxacin on carboxylated multi-walled carbon nanotubes(c-MWCNTs) modified glassy carbon electrode (c-MWCNTs/GCE) was studied,and the content of levofloxacin was determinated.The results showed that the electrode had good electrocatalysis to levofloxacin.In a mixed phosphate (NaH₂PO₄-Na₂HPO₄) buffer solution with pH 5.0,the excellent linear relationship was kept between oxidation peak currents and the concentration of levofloxacin in the range of 1×10^-5~4×10^-4 mol/L with the correlation coefficient of 0.998,and the detection limit of 2.87×10^-6 mol/L.Under the optimal test conditions,the recoveries of levofloxacin tablets were 98.7%~103.0%,and the relative standard deviation values of determination results were 1.31%~3.99%(n=5).Thus the c-MWCNTs/GCE has good electrochemical response to levofloxacin with high sensitivity and can be used for determination of levofloxacin content in drugs.

Medical Science

Application Effect of Continuous Nursing in Interventional Therapy of Patients with Coronary Heart Disease

XIA Yalan, LONG Jie, WANG Yang, ZENG Zhi

Journal of Jishou University(Natural Sciences Edition), 2024, 45(4): 82-85.

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In order to explore the effect of continuous nursing in interventional therapy (PCI) for patients with coronary heart disease (CHD),80 CHD patients who underwent PCI between January 2024 and April 2024 were selected as the study subjects.Patients were randomly divided into observation group (conventional nursing combined with continuous nursing mode) and control group (conventional nursing mode) with 40 cases in each group.The quality of life score,negative emotion score and complication rate of patients before and after nursing were compared.The results showed that the quality of life score after nursing in the observation group was significantly higher than that in the control group,and the difference between groups was statistically significant (P<0.05).The negative emotion score of the observation group after nursing was significantly lower than that of the control group,and the difference between groups was statistically significant (P<0.05).The incidence of adverse reactions after nursing in the observation group was significantly lower than that in the control group,and the difference between groups was statistically significant (P<0.05).For CHD patients undergoing PCI,continuous nursing has shown positive effects on improving quality of life,alleviating negative emotions,and reducing the incidence of complications.

Economy and management

Interaction Between the Digital Economy and Rural Revitalization：A Case Study of the Urban Agglomeration of the Yangtze River Economic Belt

LIU Junqiao, ZHANG Yong, WANG Chen

Journal of Jishou University(Natural Sciences Edition), 2024, 45(4): 86-91.

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Panel data of 110 cities in the Yangtze River Economic Belt from 2011 to 2020 are selected,and rural revitalization,digital foundation,industrial digitization and digital industrialization are included in the research framework,and the interaction between rural revitalization and the other three is empirically studied by using panel vector autoregressive model.The research results show that rural revitalization will constrain the development of digital foundation and promote the development of digital industrialization;the role of digital foundation and digital industrialization on rural revitalization is shown as constraining first and then promoting;rural revitalization and industrial digitization will promote each other.Based on this,suggestions are made to strengthen the development of digital infrastructure and local characteristic industries,implement differentiated development strategies,and play the promoting role of core cities.

Construction of Tusi World Cultural Heritage Literature Database

LI Hongyan

Journal of Jishou University(Natural Sciences Edition), 2024, 45(4): 92-96.

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This paper analyzes and explores the ideas,content,methods,and significance of constructing the database of tusi world cultural heritage literature.The database construction includes processes of literature collection and organization,content annotation and description,framework design,platform construction,data input,domain name registration,and so on.The construction of this database enables the systematic and complete presentation of world heritage Tusi literature,providing convenience for the retrieval and utilization of Tusi literature,and providing a literature basis for the protection and development of Tusi sites.