发布求助
文献互助 智能选刊 最新文献

Mathematical Modelling of Natural Phenomena最新文献

筛选
英文 中文
Nitric oxide transport in carotid bifurcation after different stent interventions: a numerical study 不同支架介入后颈动脉分叉处的一氧化氮运输：一项数值研究
IF 2.2 4区 数学
Mathematical Modelling of Natural Phenomena Pub Date : 2023-11-29 DOI: 10.1051/mmnp/2023039
Zhenmin Fan, Jiangliang Yao, Jianda Xu, Xiao Liu, Mingyuan Liu, Xia Ye, Xiaoyan Deng
{"title":"Nitric oxide transport in carotid bifurcation after different stent interventions: a numerical study","authors":"Zhenmin Fan, Jiangliang Yao, Jianda Xu, Xiao Liu, Mingyuan Liu, Xia Ye, Xiaoyan Deng","doi":"10.1051/mmnp/2023039","DOIUrl":"https://doi.org/10.1051/mmnp/2023039","url":null,"abstract":"Stent restenosis and late thrombosis compromise endovascular stent implantation clinical benefit, and the mechanism is unclear. Since nitric oxide (NO) plays a pivotal role in maintaining vascular homeostasis, we believe that stenting can affect NO concentration in the host artery, thereby contributing to postoperative adverse events. We numerically investigated NO concentration after stenting based on the patient-specific carotid to verify this hypothesis. The simulation revealed that stent implantation caused blood flow disturbance, a low wall shear stress, and a significant decrease in NO on the luminal surface, especially in the region of the stented segment. Moreover, severe damage to the artery wall or low blood flow, leading to a low NO generation rate, would induce relatively low NO level in the stented segment. Additionally, we demonstrated that NO distribution might be affected by the combination of stent struts and carotid bifurcation geometry, while the host arterial configuration might play a leading role in the distribution of NO concentration. In conclusion, the carotid artery had a relatively low NO concentration level near stent struts, especially at the severely injured artery, low blood flow, long stenting, and complex host artery which might lead to a genesis/development of adverse events after that intervention.","PeriodicalId":18285,"journal":{"name":"Mathematical Modelling of Natural Phenomena","volume":"17 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139215133","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
COMBINED HORMONE AND BRACHY THERAPIES FOR THE TREATMENT OF PROSTATE CANCER 治疗前列腺癌的荷尔蒙和支架联合疗法
IF 2.2 4区 数学
Mathematical Modelling of Natural Phenomena Pub Date : 2023-11-17 DOI: 10.1051/mmnp/2023038
S. Chabbar, A. Habbal, R. Aboulaich, Nabil Ismaili, Sanaa El Majjaoui
{"title":"COMBINED HORMONE AND BRACHY THERAPIES FOR THE TREATMENT OF PROSTATE CANCER","authors":"S. Chabbar, A. Habbal, R. Aboulaich, Nabil Ismaili, Sanaa El Majjaoui","doi":"10.1051/mmnp/2023038","DOIUrl":"https://doi.org/10.1051/mmnp/2023038","url":null,"abstract":"Prostate cancer is a hormone-dependent cancer characterized by two types of cancer cells, androgen-dependent cancer cells and androgen-resistant ones. The objective of this paper is to present a novel mathematical model for the treatment of prostate cancer under combined hormone therapy and brachytherapy. Using a system of partial differential equations, we quantify and study the evolution of the different cell densities involved in prostate cancer and their responses to the two treatments. Numerical simulations of tumor growth under different therapeutic strategies are explored and presented. The numerical simulations are carried out on FreeFem++ using a 2D finite element method.","PeriodicalId":18285,"journal":{"name":"Mathematical Modelling of Natural Phenomena","volume":"47 Suppl_B","pages":""},"PeriodicalIF":2.2,"publicationDate":"2023-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139264994","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Thermodynamical Modeling of Multiphase Flow System with Surface Tension and Flow 考虑表面张力和流动的多相流系统的热力学建模
4区 数学
Mathematical Modelling of Natural Phenomena Pub Date : 2023-10-24 DOI: 10.1051/mmnp/2023036
Hajime Koba
{"title":"Thermodynamical Modeling of Multiphase Flow System with Surface Tension and Flow","authors":"Hajime Koba","doi":"10.1051/mmnp/2023036","DOIUrl":"https://doi.org/10.1051/mmnp/2023036","url":null,"abstract":"We consider the governing equations for the motion of the viscous fluids in two moving domains and an evolving surface from both energetic and thermodynamic points of view. We make mathematical models for multiphase flow with surface flow by our energetic variational and thermodynamic approaches. More precisely, we apply our energy densities, the first law of thermodynamics, and the law of conservation of total energy to derive our multiphase flow system with surface tension and flow. We study the conservative forms and conservation laws of our system by using the surface transport theorem and integration by parts. Moreover, we investigate the enthalpy, the entropy, the Helmholtz free energy, and the Gibbs free energy of our model by applying the thermodynamic identity. The key idea of deriving surface tension and viscosities is to make use of both the first law of thermodynamics and our energy densities.","PeriodicalId":18285,"journal":{"name":"Mathematical Modelling of Natural Phenomena","volume":"IA-9 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135220402","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
On the epidemiological evolution of colistin-resistant Acinetobacter baumannii in the city of Valencia: an agent-based modelling approach 关于巴伦西亚市耐粘菌素鲍曼不动杆菌的流行病学演变:基于代理的建模方法
4区 数学
Mathematical Modelling of Natural Phenomena Pub Date : 2023-10-24 DOI: 10.1051/mmnp/2023037
Juan A. Aledo, Carlos Andreu-Vilarroig, Juan-Carlos Cortés, Juan C. Orengo, Rafael-Jacinto Villanueva
{"title":"On the epidemiological evolution of colistin-resistant Acinetobacter baumannii in the city of Valencia: an agent-based modelling approach","authors":"Juan A. Aledo, Carlos Andreu-Vilarroig, Juan-Carlos Cortés, Juan C. Orengo, Rafael-Jacinto Villanueva","doi":"10.1051/mmnp/2023037","DOIUrl":"https://doi.org/10.1051/mmnp/2023037","url":null,"abstract":"Antibiotic resistance is one of the greatest public health threats today, mainly due to the non-rational use of antibiotics. Some of these microorganisms, such as Acinetobacter baumannii, which are especially problematic in hospitals, have rapidly developed resistance and only a few last-resort antibiotics, such as colistin, are effective against them. In this work we propose a random agent-based model to describe the evolution of colistin-resistant A. baumannii in the population of Valencia city (Spain) and to predict its impact both on the whole population and by age groups. The model consists of a synthetic population whose agents evolve over time by changing their state variables randomly, based on a set of conditional probabilities, simulating the pathogen infection process. The model has been calibrated with real epidemiological data and, with the best parameters found, simulations and predictions about the incidence and the absolute cases of colistin-resistan A. baumannii have been carried out for the coming years. Results suggest that the evolution of the proportion of resistance will be exponential, exceeding 50% around 2025, and it will affect people over 60 years old more severely in terms of the number of cases.","PeriodicalId":18285,"journal":{"name":"Mathematical Modelling of Natural Phenomena","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135220405","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Influence of the age structure on the stability in a tumor-immune model for chronic myeloid leukemia 年龄结构对慢性髓系白血病肿瘤免疫模型稳定性的影响
4区 数学
Mathematical Modelling of Natural Phenomena Pub Date : 2023-10-18 DOI: 10.1051/mmnp/2023034
Kyriaki Dariva, Thomas Lepoutre
{"title":"Influence of the age structure on the stability in a tumor-immune model for chronic myeloid leukemia","authors":"Kyriaki Dariva, Thomas Lepoutre","doi":"10.1051/mmnp/2023034","DOIUrl":"https://doi.org/10.1051/mmnp/2023034","url":null,"abstract":"In this paper a model of tumor-immune response for chronic myeloid leukemia (CML) is proposed and analyzed. It is based on the ordinary differential equations' models (ODE) studied in former works. The proliferation of cells, their differentiation in the bone marrow and the interactions of leukemic and immune cells are described. The model is based on a non-monotonic immune response. At low levels immune response increases with the tumor load, whereas at high levels tumor is suppressing the effect of the immune system (immunosuppression). We consider that the age of cells is described by a continuous variable which we use to structure the system and obtain a partial differential equations' model (PDEs). We analyze the stability of the equilibrium points of the model and compare it to the case where age was described as a discrete state. In particular, an equilibrium point describing remission, induced by a control of the immune system, is shown to be unstable in certain situations for the PDE model, whereas in the ODE case, it was systematically stable.","PeriodicalId":18285,"journal":{"name":"Mathematical Modelling of Natural Phenomena","volume":"242 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135823691","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Q-well-posedness of an A$beta$-protein polymerization model A$ β $-蛋白聚合模型的q -适定性
4区 数学
Mathematical Modelling of Natural Phenomena Pub Date : 2023-09-26 DOI: 10.1051/mmnp/2023028
Léon Matar Tine, Cheikh Gueye, Laurent Pujo-Menjouet, Sorin Ionel Ciuperca
{"title":"Q-well-posedness of an A$beta$-protein polymerization model","authors":"Léon Matar Tine, Cheikh Gueye, Laurent Pujo-Menjouet, Sorin Ionel Ciuperca","doi":"10.1051/mmnp/2023028","DOIUrl":"https://doi.org/10.1051/mmnp/2023028","url":null,"abstract":"Abstract. In this work, we consider a Becker-Döring-like mathematical interaction model between Aβ-monomers and Aβ proto-oligomers playing an important role in Alzheimer’s disease. In this context, the clustering process where two or more Aβ-monomers spontaneously aggregate and form a seed of proto-oligomers is highlighted. We prove the quadratic well-posedness [4] of the problem associated with the estimation of clustering rate µ from measured data at different times.","PeriodicalId":18285,"journal":{"name":"Mathematical Modelling of Natural Phenomena","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134885427","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
TRAVELING WAVES IN HEMODYNAMIC EQUATIONS WITH THE KOITER SHELL 含koiter壳的血流动力学方程中的行波
4区 数学
Mathematical Modelling of Natural Phenomena Pub Date : 2023-09-25 DOI: 10.1051/mmnp/2023032
Sergey Vasyutkin, Alexander Chupakhin
{"title":"TRAVELING WAVES IN HEMODYNAMIC EQUATIONS WITH THE KOITER SHELL","authors":"Sergey Vasyutkin, Alexander Chupakhin","doi":"10.1051/mmnp/2023032","DOIUrl":"https://doi.org/10.1051/mmnp/2023032","url":null,"abstract":"We consider a one-dimensional model of hemodynamics for a tube defined by a Koiter shell, and investigate traveling wave solutions. The system of partial differential equations is reduced to a fourth-order ordinary differential equation for such solutions. We find a single equilibrium point and determine the condition for the changing type of the equilibria for the corresponding system of first-order differential equations. The conditions for changing the type of the equilibrium point are formulated. Then we introduce the classification of blood flow regimes relative to the type of the equilibrium point. Numerical experiments are carried out to confirm and analyze the obtained results, various regimes of blood flow are considered.","PeriodicalId":18285,"journal":{"name":"Mathematical Modelling of Natural Phenomena","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135769638","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A model for seagrass species competition: dynamics of the symmetric case. 海草物种竞争模型:对称情况下的动力学。
4区 数学
Mathematical Modelling of Natural Phenomena Pub Date : 2023-09-22 DOI: 10.1051/mmnp/2023033
Pablo Moreno-Spiegelberg, Damià Gomila
{"title":"A model for seagrass species competition: dynamics of the symmetric case.","authors":"Pablo Moreno-Spiegelberg, Damià Gomila","doi":"10.1051/mmnp/2023033","DOIUrl":"https://doi.org/10.1051/mmnp/2023033","url":null,"abstract":"We propose a general population dynamics model for two seagrass species growing and interacting in two spatial dimensions. The model includes spatial terms accounting for the clonal growth characteristics of seagrasses, and coupling between species through the net mortality rate. We consider both intraspecies and interspecies facilitative and competitive interactions, allowing density-dependent interaction mechanisms. Here we study the case of very similar species with reciprocal interactions, which allows reducing the number of the model parameters to just four, and whose bifurcation structure can be considered the backbone of the complete system. We find that the parameter space can be divided into ten regions with qualitatively different bifurcation diagrams. These regimes can be further grouped into just five regimes with different ecological interpretations. Our analysis allows the classification of all possible density distributions and dynamical behaviors of meadows with two coexisting species.","PeriodicalId":18285,"journal":{"name":"Mathematical Modelling of Natural Phenomena","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136011697","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
An analysis of the buoyancy and drag parameters in Rayleigh-Taylor dynamics 瑞利-泰勒动力学中浮力和阻力参数的分析
IF 2.2 4区 数学
Mathematical Modelling of Natural Phenomena Pub Date : 2023-08-02 DOI: 10.1051/mmnp/2023027
D. Hill, S. Abarzhi
{"title":"An analysis of the buoyancy and drag parameters in Rayleigh-Taylor dynamics","authors":"D. Hill, S. Abarzhi","doi":"10.1051/mmnp/2023027","DOIUrl":"https://doi.org/10.1051/mmnp/2023027","url":null,"abstract":"Rayleigh-Taylor instability (RTI) is of critical important in a broad range of natural and industrial processes and is an intellectual challenge for theoretical studies. In this work, we analyze the scale-dependent linear and nonlinear Rayleigh-Taylor (RT) dynamics within the group theory approach. We link the governing equations, through an associated dynamical system based on space groups, to a momentum model based on scaling transformations. In doing so, we precisely derive expressions for the buoyancy and drag parameters of the momentum model, exactly integrate the model equations and determine solutions for bubbles and for spikes in both early-time and late-time regimes. In particular, we focus on the general situation in which the instability is driven by an acceleration having power-law time dependence. Our analysis provides extensive benchmarks for future research.","PeriodicalId":18285,"journal":{"name":"Mathematical Modelling of Natural Phenomena","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2023-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49338742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Adaptation of an asexual population with environmental changes 无性种群对环境变化的适应
IF 2.2 4区 数学
Mathematical Modelling of Natural Phenomena Pub Date : 2023-07-13 DOI: 10.1051/mmnp/2023024
Florian Lavigne
{"title":"Adaptation of an asexual population with environmental changes","authors":"Florian Lavigne","doi":"10.1051/mmnp/2023024","DOIUrl":"https://doi.org/10.1051/mmnp/2023024","url":null,"abstract":"Because of mutations and selection, pathogens can manage to resist to drugs. However, the evolution of an asexual population (e.g., viruses, bacteria and cancer cells) depends on some external factors (e.g., antibiotic concentrations), and so understanding  the impact of the environmental changes is an important issue.\u0000This paper is devoted to model this problem with a nonlocal diffusion PDE, describing the dynamics of such a phenotypically structured population, in a changing environment. The large-time behaviour of this model, with particular forms of environmental changes (linear or periodically fluctuations), has been previously developed. A new mathematical approach (limited to isotropic mutations) has been developed recently for this problem, considering a very general form of environmental variations, and giving an analytic description of the full trajectories of adaptation.\u0000However, recent studies have shown that an anisotropic mutation kernel can change the evolutionary dynamics of the population: some evolutive plateaus can appear. Thus the aim of this paper is to mix the two previous studies, with an anisotropic mutation kernel, and a changing environment. The main idea is to study a multivariate distribution of (2n) \"fitness components\". Its generating function solves a transport equation, and describes the distribution of fitness at any time.","PeriodicalId":18285,"journal":{"name":"Mathematical Modelling of Natural Phenomena","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2023-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42945831","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信