Journal of Jishou University(Natural Sciences Edition)

Lattice Boltzmann Method for the NLS-Boussinesq Equation

DONG Yaru, DAI Houping, WANG Jing

Journal of Jishou University(Natural Sciences Edition), 2025, 46(2): 1-9.

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A lattice Boltzmann model with dual distribution functions is developed,and the evolution equations in the model are Taylor expanded.The Chapman-Enskog multiscale expansion technique is combined to derive the equilibrium distribution functions and correction functions and then to recover the nonlinear coupled NLS-Boussinesq equations

A Delayed Epidemic Model Affected by Disease Awareness and Vaccination

ZHAO Jialu, XIE Jingli, WANG Yuqing, LI Jialong

Journal of Jishou University(Natural Sciences Edition), 2025, 46(2): 10-22.

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In this paper,a delayed epidemic model affected by disease awareness and vaccination is established.The basic regeneration number of the model is given,and the stability of the disease-free equilibrium point and the endemic equilibrium point of the model is analyzed.Then,the discriminant condition that generates Hopf bifurcation is provided,and the effects of disease awareness conversion rate and vaccination rate on infected population are studied.The results show that when the delay is the branch parameter,the equilibrium point may have periodic solutions through the Hopf bifurcation.

Lattice Boltzmann Model for Pricing American Lookback Option

ZHANG Yi, WU Fangfang, ZHANG Qi

Journal of Jishou University(Natural Sciences Edition), 2025, 46(2): 23-30.

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The lattice Boltzmann model (LBM) is used to solve the pricing problem of the American lookback option.The domain truncation technique and the penalty method are used to transform the linear complementary model satisfied by the lookback option into a one-dimensional nonlinear parabolic problem on a bounded domain,and LBM is introduced for the transformed bounded domain problem.The macroscopic equation is recovered by selecting appropriate equilibrium distribution functions and amending functions.The numerical simulation results show that the option prices obtained by LBM agree well with the results derived from the binomial tree method and other methods,which verify the effectiveness of the model in solving the pricing problem of the American lookback option.

Design and Implementation of a Small Multi-Frequency FOT Respiratory Impedance Measurement System

LAN Hong, WANG Xingfan, LUO Xiang, LI Shu

Journal of Jishou University(Natural Sciences Edition), 2025, 46(2): 31-38.

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Based on the forced oscillation principle,a small-scale forced oscillation pulmonary function measurement system with multi-frequency compound mode is designed.Sine signals of four different frequencies (5,10,15,20 Hz) are superimposed as forced oscillation excitation sources,and the superimposed excitation source signals are output to the loudspeaker through the power amplifier circuit by the STM32F407 processor,generating oscillating airflow to act on the human respiratory system.The flow and pressure signals collected by flow sensor and pressure sensor are processed by variational mode decomposition algorithm to extract pure forced oscillation signals effectively.The experimental verification of airflow resistance measurement and adult repeatability respiratory impedance measurement shows that the system is stable and reliable,and can accurately obtain human respiratory impedance parameters,which is suitable for early detection and evaluation of clinical respiratory diseases.

Analytical Solution of Transient Matrix Suction for Homogeneous Foundation Under Medium-Peak Rainfall Infiltration

XIONG Xuanyu, QIN Weixing, XU Ruilin, HU Huiren, CHEN Jian, WU Yihan

Journal of Jishou University(Natural Sciences Edition), 2025, 46(2): 39-44.

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In order to reveal the influence of medium-peak rainfall infiltration on the spatial-temporal distribution of matrix suction,the Gardner soil-water characteristic function is introduced to simplify the Richards transient unsaturated seepage equation and to establish a water transport model for a homogeneous foundation under medium-peak rainfall infiltration.Fourier integral transform is used to obtain a analytical solution of the transient matric suction during rainwater infiltration under medium-peak rainfall.The analytical solution establishes the mapping relationship between the matric suction of unsaturated foundation and the rainfall characteristic parameters,which provides a theoretical method for quickly and accurately obtaining the matrix suction and its evolution law at any position of the foundation during the infiltration process of central-peaked pattern.

Analytical Solution of Matrix Suction for Landfill Cover Layer with Hydro-Mechanical Effect

CHEN Jian, QIN Weixing, CAO Xinhon, XU Ruilin, XIONG Xuanyu

Journal of Jishou University(Natural Sciences Edition), 2025, 46(2): 45-50.

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Rainwater infiltration changes the size and distribution of matrix suction in landfill cover layer.To investigate the evolution characteristics of matric suction in the cover layer with hydraulic coupling effects,a water transport model for a landfill cover layer under rainfall infiltration is established based on the Fredlund's unsaturated soil constitutive model.The Gardner soil-water characteristic function and Fourier integral transform are used to obtain a analytical solution of the transient matric suction during rainwater infiltration with hydro-mechanical effect.Based on this analytical solution,a comparative analysis was conducted on the differences in the evolution characteristics of matric suction in the cover layer with and without hydro-mechanical effects.It was found that the reduction rate and change amplitude of matric suction in the cover layer with hydro-mechanical effects were significantly lower than those without hydro-mechanical effects.

Fatigue Performance of Steel-Concrete Composite Beams Under Vehicle Loads

WANG Jiansheng, ZHANG Jianmeng, JIA Yumeng

Journal of Jishou University(Natural Sciences Edition), 2025, 46(2): 51-57.

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In order to more accurately calculate the fatigue damage and fatigue life of steel-concrete composite beam under standard vehicle load,the steel beam components of a large-span steel-concrete composite beam suspension bridge were taken as the research object.Based on the S-N curve and linear fatigue damage theory,a standard segment model was established.Accordingly,the welding position of the secondary longitudinal beam was identified as the focus fatigue point,and the stress time course calculation was done for the point.The results showed that when the vehicle mass increases from 50 t to 100 t,the amount of fatigue damage will increase by more than 5 times in the same period of time,and the increase in the vehicle mass will reduce the fatigue life of the bridge structure.The fatigue damage of bridge structures increases with the increase of vehicle speed.The increase rate of fatigue damage is greater at low speeds,and the increase rate of fatigue damage slows down at high speeds.

Basic Characteristics of Karst Environment and the Research Progress

JIA Xinglian, YANG Shunsong, WEI Changsheng, YU Yanghua

Journal of Jishou University(Natural Sciences Edition), 2025, 46(2): 58-67.

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The basic characteristics of karst environment are summarized from six aspects:global distribution and key areas,main lithology and soil development,above-ground and underground duality and three-dimensional structure,basic traits of key elements,habitat heterogeneity and biodiversity,vulnerability of ecological environment and difficulty of management.Then,from the perspective of publication time and number,researchers and cooperation,research institutions,research hotspots,keywords clustering and emergence,the existing literature is reviewed,and the research status and changing trend are expounded.Finally,further research is prospected from integration of existing literature reports,enhancement of geology-soil-biological continuum,comparison of karst with other landforms,association of karst with national economic and social development,and comparison of karst in the north with that in south.

Exploration of Anti-Aging Mechanisms of the Panax ginseng-Atractylodes macrocephala Pair Based on Network Pharmacology

HE Peiyi, LU Zhizhong, ZANG Linquan

Journal of Jishou University(Natural Sciences Edition), 2025, 46(2): 68-77.

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To elucidate the anti-aging material basis and mechanisms of the Panax ginseng-Atractylodes macrocephala (Ginseng-White Atractylodes) herb pair,this study utilized network pharmacology approaches.Chemical components of the herb pair were obtained from the TCMSP database,and their corresponding targets were collected using Swiss Target Prediction database.Aging-related targets were identified from GeneCards,OMIM,DiGSee,and HAGR databases.The common aging targets between the herb pair were determined using Venny 2.1.A drug-component-target-disease network was constructed using Cytoscape 3.8.2,while a protein-protein interaction network was established via the STRING database.GO function and KEGG pathway enrichment analyses were conducted using the DAVID database.Results revealed that Ginseng contains 22 active components and Atractylodes macrocephala contains 7,collectively regulating 159 targets and 171 signaling pathways with anti-aging effects;key chemical components,including kaempferol,β-sitosterol,stigmasterol,inermin,and 3β-acetoxyatractylone,mediate anti-aging effects through signaling pathways involving JUN，AKT1，TNF，CASP3,and CYP2B6.

Differential Expression and Clinical Significance of MIA3 Based on Bioinformatics Analysis in Pan-Cancer

CHEN Gonghua1, OU Pengfei, ZHEN Yao1, 3, XIA Jie1, MAN Jing

Journal of Jishou University(Natural Sciences Edition), 2025, 46(2): 78-89.

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To elucidate the expression profile and role of MIA3 in pan-cancer,we collected data from TCGA and other databases and employed bioinformatics methods to explore the associations between MIA3 and clinical prognosis as well as immune-related characteristics in various cancers.Results showed that MIA3 expression was significantly upregulated in invasive breast cancer,bladder urothelial carcinoma,esophageal cancer,head and neck squamous cell carcinoma,renal clear cell carcinoma,mixed renal cancer,hepatocellular carcinoma,lung adenocarcinoma,lung squamous cell carcinoma,prostate cancer,gastric cancer,and gastroesophageal cancer,while it was significantly downregulated in renal chromophobe carcinoma and thyroid carcinoma.The highest mutation frequency of MIA3 was observed in endometrial cancer (11.4%),followed by gastric cancer (6.1%).In most cancers,especially ovarian serous cystadenoma,brain low-grade glioma,glioblastoma multiforme,renal papillary cell carcinoma,and mixed renal cancer,MIA3 expression was positively correlated with DNA methyltransferase expression.High expression of MIA3 was a risk factor for poor prognosis in adrenocortical carcinoma,renal chromophobe carcinoma,renal papillary cell carcinoma,mixed renal cancer,and brain low-grade glioma.Conversely,low expression of MIA3 was associated with poor prognosis in cutaneous melanoma and ovarian serous cystadenoma.The infiltration of cancer immune cells,including B cells,CD4+T lymphocytes,CD8+T lymphocytes,neutrophils,dendritic cells,and macrophages,was significantly correlated with MIA3 expression.Additionally,MIA3 expression was positively correlated with stromal and immune scores in colorectal cancer,mixed renal cancer,head and neck squamous cell carcinoma,renal clear cell carcinoma,testicular germ cell tumors,and renal chromophobe carcinoma.These findings suggest that MIA3 may serve as a valuable prognostic biomarker and potential therapeutic target for multiple cancers.However,further studies are needed to confirm these findings

Development Status and Optimization Path of Rural Entrepreneurial Ecosystem：GEM Model Based on Survey Data of 805 Rural Enterprises

ZHANG Huaiying, TONG Ziping, CHANG Le, GAO Xin

Journal of Jishou University(Natural Sciences Edition), 2025, 46(2): 90-96.

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This paper conducted a survey on 805 rural entrepreneurial enterprises in China and analyzed the status quo of rural entrepreneurial ecosystem by adopting the global entrepreneurship monitor (GEM) model.The results show that:the overall operation and development trend of rural entrepreneurial enterprises are good,but the overall scale is not large,the level of development is not high.The rural entrepreneurial environment is generally good,but the support measures in the aspects of R&D transfer,commercial and legal infrastructure need to be further optimized.It is suggested that measures must be taken,such as comprehensively optimizing the allocation of rural entrepreneurial resources,further promoting the integration of industry,university and research,optimizing intermediary service institutions,actively promoting learning atmosphere in rural areas and improving the driving ability of high-quality subjects,so as to promote the high-quality development of rural entrepreneurial ecosystem.

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