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Controllability of coupled fractional integrodifferential equations 耦合分数阶积分微分方程的可控性
IF 1.5 4区 工程技术 Q2 Mathematics Pub Date : 2022-07-08 DOI: 10.1515/ijnsns-2022-0015
H. Waheed, A. Zada, R. Rizwan, I. Popa
Abstract In this article, we examine a coupled system of fractional integrodifferential equations of Liouville–Caputo form with instantaneous impulsive conditions in a Banach space. We obtain the existence and uniqueness results by applying the theory of fixed point theorems. In a similar manner, we discuss Hyers–Ulam stability and controllability. We also present an example to show the validity of the obtained results.
摘要在本文中,我们研究了Banach空间中具有瞬时脉冲条件的Liouville–Caputo形式的分数阶积分微分方程的耦合系统。应用不动点定理得到了存在唯一性的结果。以类似的方式,我们讨论了Hyers–Ulam的稳定性和可控性。我们还举了一个例子来证明所获得结果的有效性。
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引用次数: 1
Analysis and numerical effects of time-delayed rabies epidemic model with diffusion 具有扩散的时滞狂犬病流行模型分析及数值效应
IF 1.5 4区 工程技术 Q2 Mathematics Pub Date : 2022-07-07 DOI: 10.1515/ijnsns-2021-0233
Muhammad Jawaz, M. A. Rehman, N. Ahmed, D. Baleanu, M. Iqbal, M. Rafiq, A. Raza
Abstract The current work is devoted to investigating the disease dynamics and numerical modeling for the delay diffusion infectious rabies model. To this end, a non-linear diffusive rabies model with delay count is considered. Parameters involved in the model are also described. Equilibrium points of the model are determined and their role in studying the disease dynamics is identified. The basic reproduction number is also studied. Before going towards the numerical technique, the definite existence of the solution is ensured with the help of the Schauder fixed point theorem. A standard result for the uniqueness of the solution is also established. Mapping properties and relative compactness of the operator are studied. The proposed finite difference method is introduced by applying the rules defined by R.E. Mickens. Stability analysis of the proposed method is done by implementing the Von–Neumann method. Taylor’s expansion approach is enforced to examine the consistency of the said method. All the important facts of the proposed numerical device are investigated by presenting the appropriate numerical test example and computer simulations. The effect of τ on infected individuals is also examined, graphically. Moreover, a fruitful conclusion of the study is submitted.
本文主要研究了狂犬病延迟扩散传染模型的疾病动力学和数值模拟问题。为此,考虑了具有延迟计数的非线性扩散狂犬病模型。并对模型中涉及的参数进行了描述。确定了模型的平衡点,并确定了平衡点在疾病动力学研究中的作用。并对基本繁殖数进行了研究。在进入数值技术之前,借助于Schauder不动点定理,保证了解的确定存在性。并给出了解的唯一性的标准结果。研究了算子的映射性质和相对紧性。采用R.E. Mickens定义的规则引入了有限差分法。采用冯-诺伊曼方法对该方法进行了稳定性分析。采用泰勒展开法来检验上述方法的一致性。通过适当的数值试验实例和计算机模拟,研究了所提出的数值装置的所有重要事实。还以图形方式考察了τ对受感染个体的影响。此外,本文还提出了一个富有成效的研究结论。
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引用次数: 2
A (2 + 1)-dimensional variable-coefficients extension of the Date–Jimbo–Kashiwara–Miwa equation: Lie symmetry analysis, optimal system and exact solutions Date–Jimbo–Kashiwara–Miwa方程的(2+1)维变系数扩展:李对称性分析、最优系统和精确解
IF 1.5 4区 工程技术 Q2 Mathematics Pub Date : 2022-07-07 DOI: 10.1515/ijnsns-2021-0406
Yuru Hu, Feng Zhang, Xiangpeng Xin, Hanze Liu
Abstract In this article, the Date–Jimbo–Kashiwara–Miwa equation is extended to a new variable-coefficients equation with respect to the time variable. The infinitesimal generators are acquired by studying the Lie symmetry analysis of the equation, and the optimal system of this equation is presented. After that, the equation performed similarity reductions, and the reduced partial differential equations (PDEs) are transformed into ordinary differential equations (ODEs) with the help of traveling wave transform. Then, the exact solutions are found by applying the extended tanh-function method. Finally, the structural features of exact solutions to different times are shown with the help of images.
摘要本文将Date-Jimbo-Kashiwara-Miwa方程推广为一个新的关于时间变量的变系数方程。通过对该方程的李对称分析,得到了该方程的无穷小生成子,并给出了该方程的最优解。然后对方程进行相似性约简,利用行波变换将约简后的偏微分方程转化为常微分方程。然后,应用扩展的tanh函数方法求出了精确解。最后,借助图像展示了不同时刻精确解的结构特征。
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引用次数: 0
Rational soliton solutions in the nonlocal coupled complex modified Korteweg–de Vries equations 非局部耦合复变Korteweg–de Vries方程中的有理孤子解
IF 1.5 4区 工程技术 Q2 Mathematics Pub Date : 2022-07-07 DOI: 10.1515/ijnsns-2021-0337
Miao Li, Yi Zhang, Rusuo Ye, Yu Lou
Abstract In this article, our work oversees with the nonlocal coupled complex modified Korteweg–de Vries equations (cmKdV), which is a nonlocal generalization for coupled cmKdV equations. The n-fold Darboux transformation (DT) is constructed in the form of determinants for the nonlocal coupled cmKdV equations. Via generalized DT method, we obtain the rational soliton solutions describing M-shaped soliton, W-shaped soliton, and the interactions on the plane wave and periodic background. The results can be useful to study the dynamical behaviors of soliton solutions in nonlocal wave models.
本文研究了非局部耦合复修正Korteweg-de Vries方程(cmKdV),它是耦合cmKdV方程的非局部推广。对于非局部耦合cmKdV方程,以行列式的形式构造了n重达布变换(DT)。通过广义DT方法,我们得到了描述m形孤子、w形孤子以及平面波和周期背景相互作用的有理孤子解。所得结果对研究非局域波模型中孤子解的动力学行为具有指导意义。
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引用次数: 0
Investigating existence results for fractional evolution inclusions with order r ∈ (1, 2) in Banach space 研究了Banach空间中阶r∈(1,2)的分数阶演化内含物的存在性结果
IF 1.5 4区 工程技术 Q2 Mathematics Pub Date : 2022-07-07 DOI: 10.1515/ijnsns-2021-0368
M. Mohan Raja, V. Vijayakumar, A. Shukla, K. Nisar, S. Rezapour
Abstract This manuscript investigates the issue of existence results for fractional differential evolution inclusions of order r ∈ (1, 2) in the Banach space. In the beginning, we analyze the existence results by referring to the fractional calculations, cosine families, multivalued function, and Martelli’s fixed point theorem. The result is also used to investigate the existence of nonlocal fractional evolution inclusions of order r ∈ (1, 2). Finally, a concrete application is given to illustrate our main results.
研究了Banach空间中阶r∈(1,2)的分数阶微分演化包含的存在性结果问题。首先,我们从分数计算、余弦族、多值函数和Martelli不动点定理等方面分析了存在性结果。该结果还用于研究r∈(1,2)阶的非局部分数进化包含的存在性。最后,给出了一个具体应用来说明我们的主要结果。
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引用次数: 2
A new generalized approach to study the existence of solutions of nonlinear fractional boundary value problems 研究非线性分式边值问题解存在性的一种新的广义方法
IF 1.5 4区 工程技术 Q2 Mathematics Pub Date : 2022-07-04 DOI: 10.1515/ijnsns-2021-0338
Asmat Batool, Imran Talib, Rym Bourguiba, I. Suwan, T. Abdeljawad, M. Riaz
Abstract In this paper, we construct a new generalized result to study the existence of solutions of nonlinear fractional boundary value problems (FBVPs). The proposed results unify the existence criteria of certain FBVPs including periodic and antiperiodic as special cases that have been previously studied separately in the literature. The method we employ is topological in its nature and manifests themselves in the forms of differential inequalities (lower and upper solutions, and coupled lower and upper solutions (CLUSs)). Two examples are given to demonstrate the applicability of the developed theoretical results.
摘要本文构造了一个新的广义结果来研究非线性分数边值问题(FBVP)解的存在性。所提出的结果统一了某些FBVP的存在标准,包括作为特殊情况的周期性和反周期性,这些特殊情况在文献中已经单独研究过。我们使用的方法本质上是拓扑的,表现为微分不等式的形式(上下解,以及上下耦合解(CLUS))。通过两个算例验证了理论结果的适用性。
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引用次数: 1
The deterministic and stochastic solutions for the nonlinear Phi-4 equation 非线性pi -4方程的确定性和随机解
IF 1.5 4区 工程技术 Q2 Mathematics Pub Date : 2022-06-16 DOI: 10.1515/ijnsns-2022-2272
M. Abdelrahman, M. Sohaly, S. Ammar, Yousef F. Alharbi
Abstract In the present work, the exp(−φ(ξ))-expansion method is applied for solving the deterministic and stochastic Phi-4 equation. Namely, we introduce hyperbolic, trigonometric, and rational function solutions. The computational study shows that the offered method is pretentious, robust, and influential in applications of interesting analysis, observations of particle physics, plasma physics, quantum field theory, and fluid dynamics. The control on the randomness input (the coefficients are random variables) is studied in order to obtain stability stochastic process solution with beta distribution. In this work, we will deal with stability moment method and then we apply the mean square calculus for the stability concept.
摘要本文应用exp(−φ(ξ))展开法求解确定性和随机的pi -4方程。也就是说,我们引入双曲、三角和有理函数解。计算研究表明,该方法在粒子物理、等离子体物理、量子场论和流体动力学的有趣分析、观测中具有很强的鲁棒性和影响力。为了得到具有beta分布的稳定随机过程解,研究了对随机输入(系数为随机变量)的控制。在本工作中,我们将处理稳定矩法,然后将均方微积分应用于稳定性概念。
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引用次数: 2
The simulation of two-dimensional plane problems using ordinary state-based peridynamics 基于常态的周动力学模拟二维平面问题
IF 1.5 4区 工程技术 Q2 Mathematics Pub Date : 2022-06-13 DOI: 10.1515/ijnsns-2021-0320
Jingjing Zhao, Guangda Lu, Qing Zhang, W. Du
Abstract The ordinary state-based peridynamics (OSB PD) model is an integral nonlocal continuum mechanics model. And the three-dimensional OSB PD model can deal with linear elastic solid problems well. But for plane problems, the calculation results of existing models have large deviations. In this paper, a set of OSB PD models for plane problems is established by theoretical derivation. First, through the strain energy density function equivalence of peridynamics and classical continuum mechanics, the equivalent coefficients of the plane strain and plane stress problems of OSB PD are deduced. Then, consider the cantilever beam deformation simulation under concentrated load. The simulation results show that the maximum displacements are in good agreement with the corresponding analytical solutions in all directions. Finally, in the simulation of the slab with a hole, the two cases of uniform displacement and uniform load are considered, respectively. The simulation results are consistent with the ANSYS analysis results, and the deviation is small, which verifies the validity of the model.
摘要基于常态的周动力学(OSB-PD)模型是一个积分的非局部连续介质力学模型。三维OSB PD模型能够很好地处理线性弹性实体问题。但对于平面问题,现有模型的计算结果存在较大偏差。本文通过理论推导,建立了一组平面问题的OSB-PD模型。首先,通过周动力学和经典连续介质力学的应变能密度函数等效,推导了OSB PD平面应变和平面应力问题的等效系数。然后,考虑悬臂梁在集中荷载作用下的变形模拟。仿真结果表明,各方向的最大位移与相应的解析解吻合良好。最后,在有孔板的模拟中,分别考虑了均匀位移和均匀荷载两种情况。仿真结果与ANSYS分析结果一致,偏差较小,验证了模型的有效性。
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引用次数: 1
Two new iterative schemes to approximate the fixed points for mappings 映射不动点逼近的两个新迭代方案
IF 1.5 4区 工程技术 Q2 Mathematics Pub Date : 2022-06-03 DOI: 10.1515/ijnsns-2021-0141
Aniruddha V. Deshmukh, D. Gopal, V. Rakočević
Abstract In this article, we present a study of two iterative schemes to approximate the fixed points of enriched non-expansive maps and enriched generalized non-expansive maps. The schemes introduced in this article generalize those given by Thakur et al. in (“A new iterative scheme for approximating fixed points of nonexpansive mappings,” Filomat, vol. 30, no. 10, pp. 2711–2720, 2016.) and Ali et al. in (“Approximation of Fixed points for Suzuki’s generalized nonexpansive mappings,” Mathematics, vol. 7, no. 6, pp. 522–532, 2019.) in a sense that our schemes work for larger classes of enriched mappings and the schemes given by Thakur et al. and Ali et al. reduce to a particular case of our iterative techniques. Taking inspiration from Berinde (“Picard iteration converges faster than Mann iteration for a class of quasi-contractive operators,” Fixed Point Theory Appl., vol. 2004, no. 2, pp. 97–105, 2004.) and Maniu (“On a three-step iteration process for Suzuki mappings with qualitative study,” Numer. Funct. Anal. Optim., 2020.), we also give stability results of the our procedures for enriched contractions (introduced by Berinde in 2019). Lastly, we compare the rate of convergence of our schemes with each other and the conventional Krasnoselskii iteration process used for approximating fixed points of enriched contractions along with some examples. As an application to the proposed iterative schemes, we give a few results on the solutions of linear system of equations.
摘要在本文中,我们研究了两种迭代方案来逼近富非扩张映射和富广义非扩张映射的不动点。本文中引入的方案推广了Thakur等人在(“近似非扩张映射不动点的新迭代方案”,Filomat,第30卷,第10期,第2711–2720页,2016)和Ali等人在(《Suzuki广义非扩张映射的不动点逼近》,数学,第7卷,第6期,第522–5322019页)中给出的方案,从某种意义上说方案适用于更大类的丰富映射,Thakur等人和Ali等人给出的方案简化为迭代技术的一个特殊情况。灵感来自Berinde(“一类拟压缩算子的Picard迭代收敛速度快于Mann迭代,”不动点理论应用,2004年第2卷,第97–105页。)和Maniu(“关于Suzuki映射的三步迭代过程与定性研究,”Numer.Funct.Anal.Opti.,2020.),我们还给出了我们的浓缩收缩程序的稳定性结果(由Berinde于2019年引入)。最后,我们比较了我们的方案的收敛速度,以及用于逼近富集收缩不动点的传统Krasnoselskii迭代过程,并给出了一些例子。作为迭代格式的应用,我们给出了线性方程组解的一些结果。
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引用次数: 0
Stability analysis and numerical simulations of the fractional COVID-19 pandemic model 新冠肺炎部分传染病模型的稳定性分析与数值模拟
IF 1.5 4区 工程技术 Q2 Mathematics Pub Date : 2022-05-30 DOI: 10.1515/ijnsns-2021-0042
Ahmad Alalyani, S. Saber
Abstract The purpose of this article is to formulate a simplified nonlinear fractional mathematical model to illustrate the dynamics of the new coronavirus (COVID-19). Based on the infectious characteristics of COVID-19, the population is divided into five compartments: susceptible S(t), asymptomatic infection I(t), unreported symptomatic infection U(t), reported symptomatic infections W(T) and recovered R(t), collectively referred to as (SIUWR). The existence, uniqueness, boundedness, and non-negativeness of the proposed model solution are established. In addition, the basic reproduction number R 0 is calculated. All possible equilibrium points of the model are examined and their local and global stability under specific conditions is discussed. The disease-free equilibrium point is locally asymptotically stable for R 0 leq1 and unstable for R 0 > 1. In addition, the endemic equilibrium point is locally asymptotically stable with respect to R 0 > 1. Perform numerical simulations using the Adams–Bashforth–Moulton-type fractional predictor–corrector PECE method to validate the analysis results and understand the effect of parameter variation on the spread of COVID-19. For numerical simulations, the behavior of the approximate solution is displayed in the form of graphs of various fractional orders. Finally, a brief conclusion about simulation on how to model transmission dynamics in social work.
摘要本文的目的是建立一个简化的非线性分数阶数学模型,以说明新型冠状病毒(新冠肺炎)的动力学。根据新冠肺炎的传染特征,将人群分为五个区:易感S(t)、无症状感染I(t),未报告的有症状感染U(t)和报告的症状感染W(t)以及康复R(t)。统称为(SIUWR)。建立了模型解的存在性、唯一性、有界性和非否定性。此外,计算基本再现次数R0。考察了模型的所有可能平衡点,讨论了它们在特定条件下的局部和全局稳定性。无病平衡点对R0 leq1是局部渐近稳定的,对R0>1是不稳定的。此外,地方性平衡点对于R0>1是局部渐近稳定的。使用Adams–Bashworth–Moulton型分数预测器-校正器PECE方法进行数值模拟,以验证分析结果并了解参数变化对新冠肺炎传播的影响。对于数值模拟,近似解的行为以各种分数阶的图形的形式显示。最后,对如何对社会工作中的传播动力学进行建模的仿真做了简要的总结。
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引用次数: 8
期刊
International Journal of Nonlinear Sciences and Numerical Simulation
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