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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.   DOI: 10.13438/j.cnki.jdzk.2024.04.013 Abstract （636）      PDF（pc） （1236KB）（418）       Knowledge map    Save 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. Reference | Related Articles | Metrics | Comments（0）

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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.   DOI: 10.13438/j.cnki.jdzk.2024.04.008 Abstract （512）      PDF（pc） （1533KB）（370）       Knowledge map    Save 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. Reference | Related Articles | Metrics | Comments（0）

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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.   DOI: 10.13438/j.cnki.jdzk.2024.04.012 Abstract （477）      PDF（pc） （375KB）（256）       Knowledge map    Save 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. Reference | Related Articles | Metrics | Comments（0）

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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.   DOI: 10.13438/j.cnki.jdzk.2024.04.010 Abstract （443）      PDF（pc） （11785KB）（248）       Knowledge map    Save In this design,Li3V2-xCox(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. Reference | Related Articles | Metrics | Comments（0）

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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.   DOI: 10.13438/j.cnki.jdzk.2024.04.006 Abstract （440）      PDF（pc） （1842KB）（275）       Knowledge map    Save 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. Reference | Related Articles | Metrics | Comments（0）

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Application of Simplified Thin-Layer Chromatography in the Analysis of Paulownia fortunei Leaves LI Ming, WANG Qingrong, LI Yuhong, GUO Hongwei, LONG Guoqing, LYU Shuang, WEI Hua Journal of Jishou University(Natural Sciences Edition)    2024, 45 (6): 62-67.   DOI: 10.13438/j.cnki.jdzk.2024.06.009 Abstract （391）      PDF（pc） （11056KB）（104）       Knowledge map    Save A simplified one-dimensional thin-layer chromatography (TLC) method has been established for the identification of Paulownia species leaves,including Paulownia fortunei,Paulownia elongata,Paulownia tomentosa and Paulownia kawakamii.A single-factor experiment was conducted to select the optimal two-dimensional multiple development TLC method,which was then combined with column chromatography to segment the extract.Then,the one-dimensional TLC method was employed to identify the leaves of the four Paulownia species after developing the concentrated segments.The results showed that in the two-dimensional multiple expansion,characteristic spots of Paulownia fortunei were identified.Additionally,in the one-dimensional thin layer after segmented concentration,four common characteristic spots were observed for the four Paulownia species at 254 nm,seven common spots at 365 nm,and twelve common spots after color reaction under sunlight.The differences between Paulownia fortunei and the other three species were noted:on the developed TLC plate after color reaction,the first segment of the small polar sample showed a slightly yellow spot at an Rf value of 0.5,while the third segment of the large polar sample exhibited two light pink spots at an Rf value of approximately 0~0.2. Reference | Related Articles | Metrics | Comments（0）

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Thoughts on Grade Classification of Agricultural Products PENG Shuting Journal of Jishou University(Natural Sciences Edition)    2024, 45 (5): 77-81.   DOI: 10.13438/j.cnki.jdzk.2024.05.010 Abstract （376）      PDF（pc） （404KB）（121）       Knowledge map    Save This paper provides a brief overview of the current situation and existing problems of grade classification of agricultural products in China from the perspectives of grade classification standards,technologies,and equipment.It deeply explores the importance of grade classification of agricultural products quality and puts forward some improvement measures according to practical work in China.The improvement measures include establishing a standard system,constructing a platform,upgrading intelligent equipment,and strengthening the construction of professional talent team for quality evaluation. Reference | Related Articles | Metrics | Comments（0）

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Mechanism of Caulis Sinomenii in Treating Rheumatoid Arthritis Based on Network Pharmacology and Molecular Docking WU Ziqi, GONG Bufan, WANG Jianchao, PENG Huayong Journal of Jishou University(Natural Sciences Edition)    2024, 45 (6): 44-53.   DOI: 10.13438/j.cnki.jdzk.2024.06.007 Abstract （368）      PDF（pc） （19913KB）（134）       Knowledge map    Save To study the mechanism of Caulis Sinomenii in the treatment of rheumatoid arthritis,network pharmacology and molecular docking were used to screen 6 main active ingredients of Caulis Sinomenii from the TCMSP database.268 drug targets corresponding to the active ingredients were obtained through the PubChem library and Swiss Target Prediction.Subsequently,5 706 targets for rheumatoid arthritis were obtained through GeneCards,DisGeNET,and OMIM databases.By utilizing the Venny 2.1.0 platform to draw Venn diagrams,178 intersection targets between the active ingredients of Caulis Sinomenii and rheumatoid arthritis diseases were identified.A network diagram illustrating the interaction between the active ingredients of Caulis Sinomenii and rheumatoid arthritis disease was constructed using Cytoscape 3.10.0.Additionally,a drug component target protein network diagram was created.GO enrichment analysis and KEGG pathway enrichment analysis were conducted using the DAVID database.Molecular docking simulation was performed between the target and the active ingredients of the drug using Autodock software.The results revealed that NR3C1,AKT1,SRC,PPARG,and JUN are the key target proteins for the anti-rheumatoid arthritis effect of Caulis Sinomenii.The GO enrichment analysis results indicated that biological processes mainly include G protein-coupled receptor signaling pathway,coupled to cyclic nucleotide second messenger G,vascular process in circulatory system,adenylate cyclase-modulating G protein-coupled receptor,peptidyl-serine phosphorylation,etc.The cellular components mainly include integral component of presynaptic membrane,intrinsic component of presynaptic membrane,membrane raft,membrane microdomain,etc.The molecular functions mainly involve nuclear receptor activity,ligand-activated transcription factor activity,catecholamine binding,protein tyrosine kinase activity,etc.According to the KEGG enriched bubble diagram,it can be inferred that the affected pathways include the cancer pathway,the neuroactive ligand receptor interaction pathway,and the inflammatory mediator regulatory pathway of the TRP channel.The molecular docking results indicated that the active ingredients,including β-sitosterol,razmanine,xylosterol,sinomenine,and levodontidine,are associated with the core targets NR3C1,AKT1,SRC,PPARG,and JUN,all showing good binding activity.The treatment of rheumatoid arthritis with Caulis Sinomenii may involve a multi-component,multi-target,and multi-pathway process,which includes regulating inflammatory cytokines,immune cells,cell cycles (such as apoptosis and burning),and osteoblasts and osteoclasts to treat rheumatoid arthritis. Reference | Related Articles | Metrics | Comments（0）

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Stability and Hopf Bifurcation of a Delayed Drug Abstinence Model ZHANG Zizhen, ZHANG Yixue Journal of Jishou University(Natural Sciences Edition)    2024, 45 (5): 1-10.   DOI: 10.13438/j.cnki.jdzk.2024.05.001 Abstract （366）      PDF（pc） （1981KB）（181）       Knowledge map    Save A class of delayed Susceptible-Light-Heavy-Mentally ill-Treated-Quitted (SLHMTQ)drug rehabilitation model with bilinear contact rate was studied.The bifurcation parameter as the time delay of drug addiction relapse,the local asymptotic stability of the model and the existence of local Hopf bifurcation were investigated using the eigenvalue method.The critical time delay value for the model to generate local Hopf bifurcation was derived,and the properties of the bifurcation periodic solution were studied using the central manifold theorem. Reference | Related Articles | Metrics | Comments（0）

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Low Frequency Wideband Sound Absorber Based on Extended-Neck Helmholtz Resonance XIAO Yafeng, YU Yuchi, WANG Jiahao, XU Feng, SHEN Danheng, LIU Yaoguang, LIN Yuanyan, KONG Peng, DENG Ke Journal of Jishou University(Natural Sciences Edition)    2025, 46 (1): 45-50.   DOI: 10.13438/j.cnki.jdzk.2025.01.007 Abstract （364）      PDF（pc） （1585KB）（206）       Knowledge map    Save In order to solve the problem of low frequency sound absorption of Helmholtz resonator,an efficient wideband sound absorber with deep subwavelength thickness was designed by combining arrayed extended neck with Helmholtz resonance structure.The results show that the thickness of the absorber is only 1/36 of the wavelength corresponding to the absorption peak frequency,showing the sound absorption characteristics of deep subwavelength.When the resonant frequency is 315 Hz,the absorption peak amplitude of the sound absorber is as high as 0.985,which almost realizes the perfect absorption of sound energy.The sound absorption mechanism of the sound absorber is mainly due to the friction loss of sound energy in the inner wall of multiple extended necks.The arrayed extended neck provides additional tunability for the acoustic impedance of the absorber,and the operating frequency and bandwidth can be flexibly tuned in a wide band.Among the structural parameters,both the extended neck aperture and the extended neck tube length significantly affect the sound absorption performance of the sound absorber.The sound absorber has simple structure,thin thickness and good low frequency sound absorption performance. Reference | Related Articles | Metrics | Comments（0）

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Impact of Policy Perception on College Students' Grassroots Employment Intention:A Moderated Mediation Model PENG Liping Journal of Jishou University(Natural Sciences Edition)    2025, 46 (1): 90-95.   DOI: 10.13438/j.cnki.jdzk.2025.01.014 Abstract （363）      PDF（pc） （625KB）（176）       Knowledge map    Save To investigate the impact of policy perception on college students' grassroots employment intention,a mediating model was constructed in which policy perception impact s college students' grassroots employment intention through public service motivation,and the moderating role of career adaptability in this model was examined.Using structural equation modeling on 1 320 valid questionnaires,the results showed that:policy perception had a significant positively predictive effect on college students' grassroots employment intention.Public service motivation played a mediating role between policy perception and college students' grassroots employment intention.Career adaptability moderated both the direct effect of policy perception on college students' grassroots employment intention and the indirect effect through public service motivation. Reference | Related Articles | Metrics | Comments（0）

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Path for Ideological and Political Education in University Sports Curriculum of the New Era LI Yuwen Journal of Jishou University(Natural Sciences Edition)    2024, 45 (5): 93-96.   DOI: 10.13438/j.cnki.jdzk.2024.05.013 Abstract （358）      PDF（pc） （332KB）（149）       Knowledge map    Save In response to the problems existing in the ideological and political education in college sports courses,it is proposed that the ideological and political elements in college sports teaching should be highlighted,the ideological and cultural literacy of college sports teachers should be enhanced,the effect of diversified evaluation sports be strengthened,the integrated construction of the ideological and political system and mechanism be strengthened,the construction of distinctive sports courses with ideological and political characteristics be enhanced,the efforts to strengthen the construction of campus sports culture be intensified,and the construction of sports clubs and sports brand activities should be strengthened.Ultimately,the goal is to achieve the organic combination of ideological and political education and physical education in university sports curriculum. Reference | Related Articles | Metrics | Comments（0）

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Construction of Tusi World Cultural Heritage Literature Database LI Hongyan Journal of Jishou University(Natural Sciences Edition)    2024, 45 (4): 92-96.   DOI: 10.13438/j.cnki.jdzk.2024.04.014 Abstract （352）      PDF（pc） （416KB）（266）       Knowledge map    Save 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. Reference | Related Articles | Metrics | Comments（0）

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Optimization of Extraction Process and Vitro Antioxidant Activity of Total Polysaccharides from Polygonatum odoratum ZHANG Yan, ZHANG Yang, CHEN Jiarui, YAO Shufeng, CHENG Jiang Journal of Jishou University(Natural Sciences Edition)    2024, 45 (6): 37-43.   DOI: 10.13438/j.cnki.jdzk.2024.06.006 Abstract （343）      PDF（pc） （6072KB）（144）       Knowledge map    Save The extraction process and antioxidant activity of total polysaccharide from the rhizome of Polygonatum odoratum were evaluated.The total polysaccharide was isolated from Polygonatum odoratum rhizome through ultrasound-assisted water bath heating extraction method.The influences of material-liquid ratio,ultrasonic power,ultrasonic extraction temperature on the extraction rate of the total polysaccharide were investigated.Based on the results of single-factor experiments,the response surface experiments give the optimal extraction conditions of total polysaccharide from the rhizome of Polygonatum odoratum∶ material-liquid ratio 1∶15 (g∶mL),ultrasonic power 300 W,extraction time 60 min,and ultrasonic extraction temperature 60 ℃.Under these extraction conditions,the total polysaccharide yield of Polygonatum odoratum was 13.58%.The results of the antioxidant activity test showed that when the mass concentration of Polygonatum odoratum polysaccharide was 2.75 g/L,the scavenging rates of Polygonatum odoratum polysaccharide on DPPH radicals and OH radicals were 34.18% and 62.04%,respectively. Reference | Related Articles | Metrics | Comments（0）

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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.   DOI: 10.13438/j.cnki.jdzk.2024.04.007 Abstract （342）      PDF（pc） （1826KB）（240）       Knowledge map    Save 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. Reference | Related Articles | Metrics | Comments（0）

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Establishment and Preliminary Application of Tail Suspension Analysis System Based on DeepLabCut LI Zhihong, SHENG Yihua, GU Xinli, ZHOU Cenfei, WANG Huizhi, JIA Zhujun, ZHANG Jianzhi, LI Sidi Journal of Jishou University(Natural Sciences Edition)    2024, 45 (6): 84-91.   DOI: 10.13438/j.cnki.jdzk.2024.06.013 Abstract （335）      PDF（pc） （1486KB）（275）       Knowledge map    Save A tail suspension analysis system has been established based on DeepLabCut (DLC) algorithm for evaluating depressive behavior in mice.Based on the DLC algorithm in deep learning technology,multi-path,semi-closed tail suspension hardware,the systems of software and hardware were constructed;this system and open field analysis system were applied to evaluate the tail suspension and open field behavioral changes in mice with reserpine depression model,intermittent alcohol consumption injury model,and periodontal silk ligation model.This system realized the synchronous analysis of head movement and limb movement in tail suspension,and automatically quantified 50 tail suspension indexes of dynamic and static type,posture type,and intensity type.It was found that in the reserpine depression model,compared with the control group,the movement distance,wall climbing times,and head swing times were reduced in the low-,medium-,and high-dose reserpine groups in 2 days,and the head swing times were reduced in the medium- and high-dose reserpine groups in 3 days and 4 days.In the intermittent alcohol consumption injury model,compared with the control group,the immobility time was reduced,the limb struggling times,movement distance,and movement time were increased in the low- and medium-dose ethanol groups,and the forelimb,hindlimb,and absolute struggling times were reduced in the high-dose ethanol group.In the periodontal silk ligation model,the movement distance and length,limb and absolute struggling times,and the total value of forelimb,hindlimb,and limb angles were reduced in the ligation group.Clearly,the DLC algorithm-based mouse tail suspension analysis system can accurately distinguish the behavioral characteristics of different mechanistic depression models. Reference | Related Articles | Metrics | Comments（0）

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Evaluation on the Integration Effect of Intangible Heritage and Tourism in Traditional Villages in Western Hunan YANG Yixian, LIU Zheng, LIU Shuiliang Journal of Jishou University(Natural Sciences Edition)    2024, 45 (5): 82-88.   DOI: 10.13438/j.cnki.jdzk.2024.05.011 Abstract （332）      PDF（pc） （421KB）（176）       Knowledge map    Save Based on the theories of industry integration and stakeholders,this paper constructs an evaluation index system of the integration effect of intangible cultural heritage and tourism in traditional villages from four aspects of economy,culture,society and ecology,and makes an empirical analysis by taking four typical national-level traditional villages (Zhushan Village,Shiyanping Village,Shibadong Village and Huangdu Village) in western Hunan as examples.The results show that the economic,social and ecological effects of Huangdu Village are good,the cultural effects are good,and the coordination among the effects is high.The ecological and social effects of Zhushan village are good,and the economic and cultural effects are good.The ecological effect of Shibadong Village is very good,and the economic,cultural and social effect is good.The economic effect of Shiyanping village is low,the cultural effect is ordinary,the ecological and social effect is good,and the coordination among the effects needs to be enhanced.In order to further enhance the integration effect of intangible cultural heritage and tourism in traditional villages in western Hunan,and realize the deep and high-quality integration of the two,countermeasures are proposed from five stakeholder levels:government,community,villagers,enterprises and tourists. Reference | Related Articles | Metrics | Comments（0）

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Genome Based Phylogeny Analysis of Siderophore-Producing Marine Halophilic Bacterium JSM 21308 DENG Liying, SHI Yuanjie, CHEN Jinhua, DA Chunyao, LIU Zhuxiang, CHEN Yiguang Journal of Jishou University(Natural Sciences Edition)    2024, 45 (5): 61-67.   DOI: 10.13438/j.cnki.jdzk.2024.05.008 Abstract （328）      PDF（pc） （2392KB）（161）       Knowledge map    Save To accurately determine the systematic status of the siderophore-producing marine halophilic bacteria JSM 21308 isolated from mangrove sediment collected from the Moon Bay in Wenchang City in Hainan Province,PR China,the evolutionary status was primarily analysed based on 16S rRNA gene sequences.The draft genome was mapped,and then the exact phylogenetic relationship of strain JSM 21308 with its closely relative type strains was investigated by comparative genomics analysis based on whole-genome sequences,including comparisons of G+C content,average nucleotide identity (ANI),and digital DNA-DNA hybridization (dDDH) values,and phylogenomic analysis.The result of 16S rRNA gene sequence analysis showed that JSM 21308 belonged to the family Bacillaceae,and was most closely related to Pseudalkalibacillus hwajinpoensis SW-72T (16S rRNA gene sequence similarity,99.66%) and Alkalihalobacillus hemicentroti JSM 076093T (98.7%).These three strains formed obvious subclusters on the phylogenetic tree of 16S rRNA gene sequence,in which JSM 21308 made a separated branch.The results of comparative genomics analysis showed that the ANI and dDDH values of strain JSM 21308 and the type strain of A. hemicentroti were respectively 77.69% and 21.40%,all lower than the generally recognized threshold of bacterial species (ANI,95%~96%;dDDH,70% ).However,the ANI and dDDH values of strain JSM 21308 and A. hemicentroti JSM 076093T reached up to 99.99% and 100%,respectively.The result of phylogenomic analysis performed at the species level (70% dDDH threshold ) and subspecies level (79% dDDH threshold) also showed that strain JSM 21308 and the type strain of A. hemicentrotinot only represented the same species cluster but also the same subspecies cluster.Based on the combination of both the results of phylogenetic analysis of 16S rRNA gene sequences and comparative genomic analysis,strain JSM 21308 should be a new member of the known species of the genus Alkalihalobacillus,A. hemicentroti. Reference | Related Articles | Metrics | Comments（0）

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Solving the One-and-Two Dimensional STO Equations Based on the PINN Method WANG Jing, DAI Houping, DONG Yaru Journal of Jishou University(Natural Sciences Edition)    2025, 46 (1): 18-24.   DOI: 10.13438/j.cnki.jdzk.2025.01.003 Abstract （328）      PDF（pc） （2914KB）（184）       Knowledge map    Save Physically informed neural networks (PINN) model are used to solve the one-and two-dimensional Sharam-Tasso-Olver equations. The macroscopic equations and their initial margin conditions are used as physical information and transformed into the form of residuals,which are then used to construct a loss function to incorporate into the training process of the PINN model,and the Adam optimisation algorithm is used to achieve a high-precision solution.The numerical example results show that the loss function has high accuracy under a certain number of iterations,which verifies the reliability of the PINN model. Reference | Related Articles | Metrics | Comments（0）

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Traditional Chinese Medicine Management of Excessive Stomach Heat Type Periodontitis:A Clinical Research Review HU Caihua, LI Chao, CHANG Chen, GONG Lingziyun, OU Zhongmin, LI Qican, ZHANG Luoqin Journal of Jishou University(Natural Sciences Edition)    2025, 46 (1): 78-84.   DOI: 10.13438/j.cnki.jdzk.2025.01.012 Abstract （327）      PDF（pc） （765KB）（267）       Knowledge map    Save By reviewing and screening the literature on the treatment of periodontitis with excessive stomach fire in Chinese medicine from 1995 to 2024,which was included in databases such as CNKI,Wanfang,and VIP,this paper summarizes the research progress of Chinese medicine in the treatment of this disease.The results show that periodontitis falls within the category of "tooth socket wind and tooth bleeding" in Chinese medicine.The most common clinical syndrome is excessive stomach fire,which is caused by accumulated heat in the stomach ascending along the meridians.The treatment principle is to clear stomach heat and purge fire,cool blood and detoxify.The clinical treatment methods of periodontitis with excessive stomach fire in Chinese medicine are diverse,including traditional Chinese herbal medicine,acupuncture,auricular point plaster,and gargling.The main treatment method in clinical practice is traditional Chinese medicine,with frequently used herbs including coptis,rehmannia,paeonia,cimicifuga,and angelica.The therapeutic mechanism mainly involves reducing the levels of pro-inflammatory cytokines,reducing oxidative stress responses,inhibiting the growth of periodontal pathogenic bacteria,and enhancing the activity of periodontal ligament stem cells.The treatment of this disease with Chinese medicine is effective,safe,has few side effects,and is well accepted by patients. Reference | Related Articles | Metrics | Comments（0）

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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.   DOI: 10.13438/j.cnki.jdzk.2024.04.009 Abstract （321）      PDF（pc） （481KB）（326）       Knowledge map    Save 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. Reference | Related Articles | Metrics | Comments（0）

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History,Current Situation,and Prospect of Military Materia Medica Research LI Yanzhen, JIN Shuo, LIU Si, LONG Sisi, TANG Jingyue, ZHANG Zuxin, YE Fan, CHEN Gongxi Journal of Jishou University(Natural Sciences Edition)    2025, 46 (1): 70-77.   DOI: 10.13438/j.cnki.jdzk.2025.01.011 Abstract （309）      PDF（pc） （1376KB）（222）       Knowledge map    Save Military materia medica plays an important role in preventing and treating infectious diseases and trauma.It represents a convergence of Chinese herbal medicine and military medicine,integrating traditional and modern approaches.The development of military materia medica combines the research theories,methods,and techniques from medicine and pharmacology.Throughout history,herbalists have substantially contributed to the research and development of military herbology,achieving notable achievements.However,despite the rich history of China's military materia medica and the advanced nature of the application research,the research scope is limited and the foundational theoretical research is relatively weak.To address these gaps,it is necessary to strengthen the investigation and research of military materia medica resources in key regions,advance research on key categories and basic theories,and highlight the role of military materia medica in modern national defense. Reference | Related Articles | Metrics | Comments（0）

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Research Status and Clinical Application of the Tujia Medicinal Swertia davidii HE Tingxiang, FU Qingqing, ZHU Jiaxin, PENG Shengwen, LIU Fen Journal of Jishou University(Natural Sciences Edition)    2024, 45 (6): 1-10.   DOI: 10.13438/j.cnki.jdzk.2024.06.001 Abstract （308）      PDF（pc） （1773KB）（143）       Knowledge map    Save To further explore the medicinal potential of Tujia medicine,this paper comprehensively reviews the research progress of Swertia davidii in six aspects,including crude drug identification,chemical composition,content determination,extraction technology,pharmacological action,and clinical application,by referring to Chinese herbal medicine classics and related literature.The results indicate that Swertia davidii is abundant in various chemical components,including xanthones,iridoids,triterpenoids,and flavonoids,and exhibits diverse pharmacological activities such as anti-inflammatory,antibacterial,antitumor,antiviral,and antioxidant properties.In clinical practice,Swertia davidii is extensively used in the treatment of pulmonary fever,pneumonia,jaundice,cholecystitis,acute and chronic enteritis,gynecological inflammation,dysentery,diarrhea,urinary tract infections,scabies,oral ulcers,and other diseases,demonstrating significant medicinal value. Reference | Related Articles | Metrics | Comments（0）

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Afforestation Effect and Stand Structure of 36-Year-Old Liriodendron chinense and Sassafras tzumu Mixed Forest XIANG Ming, LIU Congquan, PENG Mengyou, YAO Maohua, XIANG Zuheng, MA Fengfeng, HE Yong, ZHANG Peng, LIU Dongmei Journal of Jishou University(Natural Sciences Edition)    2024, 45 (5): 68-76.   DOI: 10.13438/j.cnki.jdzk.2024.05.009 Abstract （307）      PDF（pc） （890KB）（259）       Knowledge map    Save The 36-year old mixed forest of Liriodendron chinense and Sassafras tzumu in the middle altitude mountain area of Longshan County was studied from the aspects of the mixing effect of the mixed forest,the influence of spinning tillering on the growth of Liriodendron chinense and the stand structure.The results showed that Liriodendron chinense and Sassafras tzumu were not suitable for the construction of mixed forest.The 36-year old mixed forest had medium stand growth,and the existing density was 756±80 trees/hm,which could be used for medium and large-diameter wood cultivation.Tillering has a significant effect on the diameter,crown width and stock of Liriodendron chinense.The diameter distribution of Liriodendron chinense showed a left-leaning approximate normal distribution,and the model applicability χ test only followed the normal distribution,but not the Weibull distribution.The height distribution of Liriodendron chinense showed a right-leaning approximate normal distribution,and its model applicability did not pass the χ test and did not conform to the normal distribution or Weibull distribution.The cubic equation is the best fitting curve equation for the height and diameter of liriodendron tree. Reference | Related Articles | Metrics | Comments（0）

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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.   DOI: 10.13438/j.cnki.jdzk.2024.04.005 Abstract （305）      PDF（pc） （655KB）（218）       Knowledge map    Save 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. Reference | Related Articles | Metrics | Comments（0）

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Progress in Surgical Treatment and Perioperative Management of Pterygium TIAN Ruonan, PENG Zhengyu Journal of Jishou University(Natural Sciences Edition)    2025, 46 (1): 85-89.   DOI: 10.13438/j.cnki.jdzk.2025.01.013 Abstract （304）      PDF（pc） （585KB）（191）       Knowledge map    Save By analyzing the recent research achievements at home and abroad on the surgical treatment of pterygium,the progress in surgical treatment methods,preoperative management,intraoperative management,postoperative management,and the prevention and treatment of surgical complications was explored.The surgical treatment methods mainly include pterygium excision + autologous limbal stem cell transplantation,pterygium excision + autologous conjunctival transplantation,pterygium excision + amniotic membrane transplantation,and pterygium excision + autologous limbal stem cell transplantation + amniotic membrane transplantation.Preoperative management mainly includes the auxiliary treatment with argon laser and the preservation of biological amniotic membrane.Intraoperative management mainly includes the application of femtosecond laser and the selection of suture methods.Postoperative management mainly involves the application of cyclosporine A,bandage contact lenses,and 5-fluorouracil.The prevention and treatment of surgical complications mainly involve recurrent pterygium and other complications (such as subconjunctival hemorrhage,graft edema,graft detachment,graft retraction,graft slippage,granuloma,etc.). Reference | Related Articles | Metrics | Comments（0）

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Characteristics and Function of the Urine Microbiome from Prostatic Hyperplasia Patients PENG Qiaomu, FAN Shiqiu, TIAN Jingjing, XIANG Tao, LI Hui, QU Xinyi Journal of Jishou University(Natural Sciences Edition)    2024, 45 (5): 52-60.   DOI: 10.13438/j.cnki.jdzk.2024.05.007 Abstract （300）      PDF（pc） （2815KB）（129）       Knowledge map    Save This work is to analyze the community structure and species abundance of urine microbiome,as well as the differential microflora in three groups of healthy people,preoperative and postoperative prostatic hyperplasia patients,and to unearth the mechanism of the differential microflora related to the development of prostatic hyperplasia.Urine samples from healthy people (control group,C),preoperative (patient group,B) and postoperative (postoperative group,S) patients with prostatic hyperplasia were collected,and sequenced by whole metagenome shotgun sequencing.Bioinformatics analysis was carried out by related software.The results were as follows:the microbial diversity of B group samples (preoperative BPH patients) was lower than that of C and S groups of samples.At the phylum level,the abundance of Firmicutes,Actinobacteria and Bacteroidetes between C and S groups had no difference,but was significantly higher than that of B group.At the genus level,the abundance of Escherichia,Pseudomonas,Acinetobacter and Shigella between C and S groups had no difference,but was lower than that of B group;the abundance of Streptococcus and Prevotella in C and S groups of samples had no difference,but was higher than that of B group.Functional annotation at the PHI-base database showed that the abundance of some mutualistic factors in B group were significantly higher than that of C and S groups,such as reduced virulence factors,unaffected pathogenicity factors,increased virulence factors and lethal factor,then tended to return to the level of healthy people in S group.Functional annotation at the VFBD database showed that the abundance of some virulence factors in B group was significantly higher than that of both C and S groups,such as Type IV fimbria,capsule I,flagellum,Type III secretion system,colibactin,enterobactin,etc.,then tended to return to the level of healthy people in S group.In conclusion,decreased microbial diversity in the urinary tract microbiome and the increased or decreased abundance of the specific microbial taxa during the dysbiosis of urinary microflora might be positively correlated with prostatic hyperplasia of the patients.The increased abundance of some interaction factors and virulence factors of the differential microflora in the patient urine might induce the development of prostatic hyperplasia. Reference | Related Articles | Metrics | Comments（0）

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Purification Process of Total Flavonoids from Lilium lancifolium Thunb and Its Antibacterial Activity ZHU Lanping, YUAN Jiao, YUAN Jieying, YIN Xinlian, LIU Ying, CHENG Jiang, YAO Shufeng Journal of Jishou University(Natural Sciences Edition)    2024, 45 (6): 24-30.   DOI: 10.13438/j.cnki.jdzk.2024.06.004 Abstract （293）      PDF（pc） （915KB）（167）       Knowledge map    Save Through comparing the static adsorption-desorption performance of 7 kinds of macroporous resins,the best macroporous resin with high adsorption rate and desorption rate was selected.The optimal purification process of Lilium lancifolium by macroporous resin was selected by single factor experiment and orthogonal experiment,and the total flavonoid content and antibacterial activity before and after purification were determined.The results showed that the macroporous resin with high adsorption and desorption performance was AB-8.The optimal purification process was as follows:the total flavonoid concentration of the feed solution was 0.076 4 g/L,the pH value was 4,the adsorption time was 8 hours,the solvent volume fraction was 60%,the solvent volume was 120 mL,and the desorption time was 10 hours.The total flavonoid content after purification was 11.55%,which was 5.3 times that of the purification before.The inhibition zone diameter of the purified total flavonoid was larger than that of the total flavonoid before purification,and the inhibitory effect on Staphylococcus aureus was higher than that on Escherichia coli. Reference | Related Articles | Metrics | Comments（0）

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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.   DOI: 10.13438/j.cnki.jdzk.2024.04.002 Abstract （291）      PDF（pc） （1006KB）（296）       Knowledge map    Save 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. Reference | Related Articles | Metrics | Comments（0）

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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.   DOI: 10.13438/j.cnki.jdzk.2024.04.011 Abstract （290）      PDF（pc） （911KB）（269）       Knowledge map    Save 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. Reference | Related Articles | Metrics | Comments（0）

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An SIS Epidemic Model with Delay Effect WANG Yuqin, XIE Jingli, ZHAO Jialu, LI Jialong Journal of Jishou University(Natural Sciences Edition)    2025, 46 (1): 12-17.   DOI: 10.13438/j.cnki.jdzk.2025.01.002 Abstract （289）      PDF（pc） （1135KB）（172）       Knowledge map    Save The dynamical properties of a class of SIS infectious disease models with time delay effects and logistic growth are investigated.The non-negativity and boundedness of the model solutions are proved by using the basic theory of functional differential equations and the constant variational method,and the conditions for the local stability of the equilibrium points are obtained by combining with the characteristic equations.Taking the time delay τ as the branching parameter,the conditions for Hopf branching of the endemic equilibrium points when they are unstable are obtained by Hopf branching theory. Reference | Related Articles | Metrics | Comments（0）

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Development of a Useful Compound Functional Beverage with Eucommia ulmoides-Vinegar XIANG Xiaomei, FU Li, LI Xinyao, PENG Hongjin, HE Jianwu, CHEN Gongxi Journal of Jishou University(Natural Sciences Edition)    2024, 45 (6): 77-83.   DOI: 10.13438/j.cnki.jdzk.2024.06.012 Abstract （281）      PDF（pc） （5729KB）（88）       Knowledge map    Save The production process of the compound functional beverage of Eucommia Chinese black tea and rice vinegar was studied as the main raw materials.Design-Expert 8.0.6 was used to design the experiments and the sensory score of Eucommia ulmoides-vinegar used as the index to analyse the experimental data on the response surface.The results showed that the optimal formula of the Eucommia ulmoides-vinegar was the ratio of tea to water 4∶100（w∶w）,the addition amount of rice vinegar 2.28%,the addition amount of juice A 19.05%,and the addition amount of excipient B 7.76%.Under these conditions,the sensory score of Eucommia ulmoides-vinegar was the highest,reaching 88.4 points. Reference | Related Articles | Metrics | Comments（0）

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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.   DOI: 10.13438/j.cnki.jdzk.2024.04.004 Abstract （274）      PDF（pc） （1276KB）（244）       Knowledge map    Save 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. Reference | Related Articles | Metrics | Comments（0）

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Higher-Order Topological Corner States in 2D Valley Phononic Crystals Topological Insulators JIANG Jing, KONG Peng, DENG Ke Journal of Jishou University(Natural Sciences Edition)    2025, 46 (1): 39-44.   DOI: 10.13438/j.cnki.jdzk.2025.01.006 Abstract （272）      PDF（pc） （7499KB）（210）       Knowledge map    Save Based on the quantum valley-hall effect,a two-dimensional valley phononic crystal topological insulator with C3v symmetry has been designed.By rotating the angle of the scatterers inside the lattice,the topological properties of the lattice were changed.A supercell structure was constructed using two-dimensional valley phononic crystals with different topological phases,and the high-order topological corner states were investigated.The results show that when the rotation angle is changed,the symmetry of the system will decrease from C3v symmetry to C3 symmetry.When -30°<θ< 0°,the system corresponds to a non-trivial phase,while when 0°<θ<30°,the system corresponds to a trivial phase.When the internal lattice has a non-trivial phase and the external lattice has a trivial phase,there are three continuous corner states at the corners of the Zigzag boundary of the supercell structure.However,when the internal lattice has a trivial phase and the external lattice has a non-trivial phase,there are no corner states in the supercell structure.Before and after introducing disorder defects,the intrinsic field distribution of the corner states shows no significant change,demonstrating good robustness. Reference | Related Articles | Metrics | Comments（0）

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Transformative Efficacy of Albumin-Bound Paclitaxel Combined with Tegafur,Gimeracil and Oteracil for Unresectable Pancreatic Cancer SONG Xin, ZHOU Guochao, YANG Dinghua, FU Hua, ZHOU Lyu, CAI Rongmin, TIAN Tanping Journal of Jishou University(Natural Sciences Edition)    2024, 45 (6): 92-96.   DOI: 10.13438/j.cnki.jdzk.2024.06.014 Abstract （271）      PDF（pc） （640KB）（96）       Knowledge map    Save In order to explore the efficacy and safety of albumin paclitaxel combined with tegafur (AS) regimen and albumin paclitaxel combined with gemcitabine (AG) regimen in the treatment of unresectable pancreatic cancer,patients with unresectable advanced pancreatic cancer who received AS regimen (24 cases) and AG regimen (16 cases) were selected as study subjects.Objective response rate,overall survival,progression-free survival and the incidence of grade 3/4 adverse reactions were compared between the two groups.The results showed that the objective response rate,median survival time and median progression-free survival time in AS group were higher than those in AG group,and there was no statistical significance between groups (P>0.05).The incidence of grade 3/4 peripheral nerve toxicity in AS group was significantly lower than that in AG group,and the difference was statistically significant (P<0.05).The incidence of grade 3/4 platelet count decrease,leukopenia,hemoglobin level decrease,infectious fever,nausea/vomiting,liver function impairment and poor appetite in AS group was lower than that in AG group,and the difference was not statistically significant (P>0.05).In the treatment of unresectable pancreatic cancer,the AS regimen has a lower risk of adverse effects. Reference | Related Articles | Metrics | Comments（0）

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Initial Value Inverse Problem of a Convection-Diffusion Equation with Integral Source Term QIAN Kun, TAN Ruixia, FENG Lixiang Journal of Jishou University(Natural Sciences Edition)    2024, 45 (5): 11-16.   DOI: 10.13438/j.cnki.jdzk.2024.05.002 Abstract （267）      PDF（pc） （323KB）（146）       Knowledge map    Save This paper mainly discusses the initial value inverse problem of a convection-diffusion equation with integral source term.Based on the optimal control framework,the existence of the optimal solution for the control functional is proved,and the necessary condition for the optimal solution is deduced.Finally,with the necessary conditions,non-local uniqueness and stability of the optimal solution are proved by the prior estimates of the forward problem. Reference | Related Articles | Metrics | Comments（0）

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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.   DOI: 10.13438/j.cnki.jdzk.2024.04.003 Abstract （266）      PDF（pc） （273KB）（260）       Knowledge map    Save 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. Reference | Related Articles | Metrics | Comments（0）

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Arrangement Improvement on Level Table of Orthogonal Test Factor WANG Saiqun, YIN Xiaohong Journal of Jishou University(Natural Sciences Edition)    2024, 45 (5): 89-92.   DOI: 10.13438/j.cnki.jdzk.2024.05.012 Abstract （265）      PDF（pc） （355KB）（126）       Knowledge map    Save Literature study shows that there are some problems in the arrangement of the orthogonal test factor level table in the literature,such as the inaccurate table title,the irregular arrangement format of the item column information,the wrong column in the first column from the left,inconformity of the relationship between the column and the table data with the requirement of uniformity,the factor symbol regarded as the quantity symbol and arranged in italics,etc.In view of the above problems,some suggestions are put forward:take "factor level" as the table title;in parenthesized form,the congruence of factors and their symbols is indicated,that is,arranged in the form of "temperature (A)";change the first column from the left to "serial number";change the column "factor" to "level";factor code is typed.The method accords with the editing and proofreading standard,greatly simplifies the form design,and provides reference for the standard layout of the table in books and periodicals. Reference | Related Articles | Metrics | Comments（0）

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GC-MS Fingerprint of Petroleum Ether Fraction in Paulownia fortunei Leaves LI Yuhong, GUO Hongwei, HUANG Jia, YANG Lili, LI Ming, LONG Guoqing, WEI Hua Journal of Jishou University(Natural Sciences Edition)    2024, 45 (6): 54-61.   DOI: 10.13438/j.cnki.jdzk.2024.06.008 Abstract （254）      PDF（pc） （2859KB）（95）       Knowledge map    Save To evaluate the quality of Paulownia fortunei leaves from different regions,gas chromatography-mass spectrometry was used to qualitatively analyze the petroleum ether fraction of Paulownia fortunei leaves.Squalene used as a control,the similarity evaluation system of traditional Chinese medicine chromatographic fingerprint (2012A version) used for similarity evaluation,cluster analysis and principal component analysis were combined to evaluate the quality.The results indicated that a total of 12 common peaks were identified in 19 batches of Paulownia fortunei leaves from various regions.These peaks corresponded to the following compounds:4,4,7a-Trimethyl-5,6,7,7a-tetrahydro-1-benzofuran-2(4H)-one,phytol,heptadecanoate,2-methyl octacosane,squalene,nonacosane,triacontane,hexatriacontane,α-Tocopherol,nonatriacontane,tetracontane,β-Sitosterol.Through cluster analysis,19 batches of Paulownia fortunei leaves were divided into 3 major categories.The cumulative variance contribution rate of the two principal components obtained from principal component analysis was 86.725%,and the results showed that sample S12 had a higher comprehensive score.The results of principal component analysis and cluster analysis were basically consistent. Reference | Related Articles | Metrics | Comments（0）

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Dynamic Characteristics of Long-Span Steel-Concrete Composite Beam Bridge Based on Vehicle-Bridge Coupling Effect WANG Jianxing, CAI Ran, JIA Yumeng, ZHANG Jianmeng Journal of Jishou University(Natural Sciences Edition)    2024, 45 (5): 45-51.   DOI: 10.13438/j.cnki.jdzk.2024.05.006 Abstract （253）      PDF（pc） （2530KB）（134）       Knowledge map    Save In order to investigate the effect of vehicle-bridge coupling on the dynamic characteristics of the bridge,a steel-concrete composite beam suspension bridge is taken as the research object,and a three-dimensional spatial model of the bridge and a biaxial vehicle model of the vehicle are established,and then a vehicle-bridge coupling vibration system is constructed on the basis of the Nemak-β method,and the impact coefficients of each part of the bridge are obtained under different bridge deck unevenness and vehicle speed.The simulation results show that the bridge deck unevenness has the greatest influence on the vibration response of the bridge,and the bridge impact coefficient increases along with the increase in the level of bridge deck unevenness,and the impact coefficient of the main longitudinal girder and the secondary longitudinal girder achieves the maximum value when the level 4 unevenness is 0.328 and 0.314,respectively;when the vehicle speed is increased,the vibration response of the bridge increases and then decreases,and the impact coefficient of the bridge in the middle of the bridge at a speed of 60 km/h achieves the maximum value of 0.192. Reference | Related Articles | Metrics | Comments（0）