Communications in Nonlinear Science and Numerical Simulation最新文献_第9页

Effect of wedge duration and electromagnetic noise on spiral wave dynamics 楔形持续时间和电磁噪声对螺旋波动力学的影响

IF 3.4 2区数学

Communications in Nonlinear Science and Numerical Simulation Pub Date : 2024-08-11 DOI: 10.1016/j.cnsns.2024.108262

{"title":"Effect of wedge duration and electromagnetic noise on spiral wave dynamics","authors":"","doi":"10.1016/j.cnsns.2024.108262","DOIUrl":"10.1016/j.cnsns.2024.108262","url":null,"abstract":"<div><p>This paper focuses particularly on the influence of wedge duration on spiral wave formation and the regulation of electromagnetic noise. The motion stability or periodicity of a constructed regular neuronal network system is revealed by applying the master stability function method. The effect of wedge duration and electromagnetic noise on spiral wave dynamics is quantified using defined metrics, and explained by bifurcation of neuronal activity and differentiation of neuronal populations. Research results are as follows: (1) The appearing wave head rotates and evolves into a spiral pattern due to the potential difference between neurons, which is determined by wedge duration. (2) Whether it is homogeneous or heterogeneous, electromagnetic noise can effectively regulate the evolution of spiral waves. (3) Noise excitation significantly suppresses the network firing activity and alters the electric field distribution, leading to the narrowing of spiral arm and the drift of wave head. This study not only demonstrates the importance of wedge duration for spiral wave formation, but also provides guidance for stochastically regulating the spiral wave evolution.</p></div>","PeriodicalId":50658,"journal":{"name":"Communications in Nonlinear Science and Numerical Simulation","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2024-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142098328","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Multiple transmission routes in nosocomial bacterial infections — A modeling study 医院内细菌感染的多种传播途径--一项模型研究

IF 3.4 2区数学

Communications in Nonlinear Science and Numerical Simulation Pub Date : 2024-08-10 DOI: 10.1016/j.cnsns.2024.108265

引用次数: 0

Optimal convergent analysis of a linearized Euler finite element scheme for the 2D incompressible temperature-dependent MHD-Boussinesq equations 二维不可压缩温度相关 MHD-Boussinesq 方程的线性化欧拉有限元方案的优化收敛分析

IF 3.4 2区数学

Communications in Nonlinear Science and Numerical Simulation Pub Date : 2024-08-08 DOI: 10.1016/j.cnsns.2024.108264

引用次数: 0

Multiscale study on a class of singularly perturbed system with discontinuous right-hand side and multiple root of the degenerate solution 对一类具有不连续右手边和多根退化解的奇异扰动系统的多尺度研究

IF 3.4 2区数学

Communications in Nonlinear Science and Numerical Simulation Pub Date : 2024-08-07 DOI: 10.1016/j.cnsns.2024.108247

引用次数: 0

Statistical inference for a stochastic generalized logistic differential equation 随机广义逻辑微分方程的统计推断

IF 3.4 2区数学

Communications in Nonlinear Science and Numerical Simulation Pub Date : 2024-08-07 DOI: 10.1016/j.cnsns.2024.108261

引用次数: 0

The first-order unconditionally stable projection finite element method for the incompressible vector potential magnetohydrodynamics system 不可压缩矢量势磁流体力学系统的一阶无条件稳定投影有限元法

IF 3.4 2区数学

Communications in Nonlinear Science and Numerical Simulation Pub Date : 2024-08-07 DOI: 10.1016/j.cnsns.2024.108263

引用次数: 0

Effects of contact stiffness on the nonlinear motions induced by impacts on an overhung rotor system 接触刚度对悬挂式转子系统受冲击引起的非线性运动的影响

IF 3.4 2区数学

Communications in Nonlinear Science and Numerical Simulation Pub Date : 2024-08-06 DOI: 10.1016/j.cnsns.2024.108216

{"title":"Effects of contact stiffness on the nonlinear motions induced by impacts on an overhung rotor system","authors":"","doi":"10.1016/j.cnsns.2024.108216","DOIUrl":"10.1016/j.cnsns.2024.108216","url":null,"abstract":"<div><p>The effects of contact stiffness between the rotor and stator on the internal resonance of forward and backward whirls in the rotating frame have been investigated, that is the forward and backward modes are commensurate in the rotating frame. First, the equations for an overhung rotor system with two rotors with coupling stiffness are established by Lagrangian method. By the transformation of a general coordinate system to a rotational coordinate system, we obtained the Campbell diagram in these two coordinate systems. The underlying rotating speeds corresponding to the internal resonances are analyzed by this Campbell diagram in the rotating coordinate system. Accounting for the impact force due to the exceeding of the clearance between the rotor and stator, we applied an ordinary differential equation solver to acquire the solutions, in bifurcation diagrams, orbits, FFT, and spectral density plots. The difference of the current study is investigating the stiffness effects on the nonlinear behaviors. More rich nonlinear phenomena were observed, such as 7:1, 5:1, 4:1, or 3:1 internal resonance in the rotating frame, but quasiperiodic motions are observed in the stationary frame. These internal resonance induced by forward and backward modes in the rotating frame in the FFTs was discussed, which can provide novel explanations for the complicated internal resonance.</p></div>","PeriodicalId":50658,"journal":{"name":"Communications in Nonlinear Science and Numerical Simulation","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141915318","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 numerical representation of hyperelliptic KdV solutions 超椭圆 KdV 解的数值表示

IF 3.4 2区数学

Communications in Nonlinear Science and Numerical Simulation Pub Date : 2024-08-05 DOI: 10.1016/j.cnsns.2024.108259

引用次数: 0

Convex symmetric rectangular pentagon central configurations 凸面对称矩形五边形中心构型

IF 3.4 2区数学

Communications in Nonlinear Science and Numerical Simulation Pub Date : 2024-08-05 DOI: 10.1016/j.cnsns.2024.108250

引用次数: 0

A Bertalanffy–Richards growth model perturbed by a time-dependent pattern, statistical analysis and applications 受时变模式扰动的贝尔塔兰菲-理查兹增长模型、统计分析及应用

IF 3.4 2区数学

Communications in Nonlinear Science and Numerical Simulation Pub Date : 2024-08-03 DOI: 10.1016/j.cnsns.2024.108258

{"title":"A Bertalanffy–Richards growth model perturbed by a time-dependent pattern, statistical analysis and applications","authors":"","doi":"10.1016/j.cnsns.2024.108258","DOIUrl":"10.1016/j.cnsns.2024.108258","url":null,"abstract":"<div><p>We analyze a modification of the Richards growth model by introducing a time-dependent perturbation in the growth rate. This modification becomes effective at a special switching time, which represents the first-crossing-time of the Richards growth curve through a given constant boundary. The relevant features of the modified growth model are studied and compared with those of the original one. A sensitivity analysis on the switching time is also performed. Then, we define two different stochastic processes, i.e. a non-homogeneous linear birth–death process and a lognormal diffusion process, such that their means identify to the growth curve under investigation. For the diffusion process, we address the problem of parameters estimation through the maximum likelihood method. The estimates are obtained via meta-heuristic algorithms (namely, Simulated Annealing and Ant Lion Optimizer). A simulation study to validate the estimation procedure is also presented, together with a real application to oil production in France. Special attention is devoted to the approximation of switching time density, viewed as the first-passage-time density for the lognormal process.</p></div>","PeriodicalId":50658,"journal":{"name":"Communications in Nonlinear Science and Numerical Simulation","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2024-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S100757042400443X/pdfft?md5=cebab662df46b972f2dcc65a39f284be&pid=1-s2.0-S100757042400443X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141964575","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0