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Stability Results for Nonlinear Implicit ϑ-Caputo Fractional Differential Equations with Fractional Integral Boundary Conditions 带分数积分边界条件的非线性隐含ϑ-卡普托分数微分方程的稳定性结果
IF 1.6 Q2 MATHEMATICS, APPLIED Pub Date : 2023-12-31 DOI: 10.1155/2023/5561399
I. Kaddoura, Yahia Awad
This article examines the necessary conditions for the unique existence of solutions to nonlinear implicit ϑ-Caputo fractional differential equations accompanied by fractional order integral boundary conditions. The analysis draws upon Banach’s contraction principle and Krasnoselskii’s fixed point theorem. Furthermore, the circumstances leading to the attainment of Ulam–Hyers–Rassias forms of stability are established. An illustrative example is provided to demonstrate the derived findings.
本文研究了伴随分数阶积分边界条件的非线性隐式ϑ-卡普托分数微分方程解唯一存在的必要条件。分析借鉴了巴纳赫收缩原理和克拉斯诺瑟尔斯基定点定理。此外,还确定了达到 Ulam-Hyers-Rassias 稳定形式的条件。我们还提供了一个示例来证明所得出的结论。
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引用次数: 0
Spatiotemporal Dynamics of a Reaction Diffusive Predator-Prey Model: A Weak Nonlinear Analysis 反应扩散捕食者-猎物模型的时空动力学:弱非线性分析
Q2 MATHEMATICS, APPLIED Pub Date : 2023-10-10 DOI: 10.1155/2023/9190167
N. B. Sharmila, C. Gunasundari, Mohammad Sajid
In the realm of ecology, species naturally strive to enhance their own survival odds. This study introduces and investigates a predator-prey model incorporating reaction-diffusion through a system of differential equations. We scrutinize how diffusion impacts the model’s stability. By analysing the stability of the model’s uniform equilibrium state, we identify a condition leading to Turing instability. The study delves into how diffusion influences pattern formation within a predator-prey system. Our findings reveal that various spatiotemporal patterns, such as patches, spots, and even chaos, emerge based on species diffusion rates. We derive the amplitude equation by employing the weak nonlinear multiple scales analysis technique and the Taylor series expansion. A novel sinc interpolation approach is introduced. Numerical simulations elucidate the interplay between diffusion and Turing parameters. In a two-dimensional domain, spatial pattern analysis illustrates population density dynamics resulting in isolated groups, spots, stripes, or labyrinthine patterns. Simulation results underscore the method’s effectiveness. The article concludes by discussing the biological implications of these outcomes.
在生态领域,物种自然会努力提高自己的生存几率。本文通过微分方程系统引入并研究了一个包含反应-扩散的捕食者-猎物模型。我们仔细研究扩散如何影响模型的稳定性。通过分析模型均匀平衡状态的稳定性,我们确定了导致图灵不稳定性的条件。这项研究深入研究了扩散如何影响捕食者-猎物系统中的模式形成。我们的研究结果表明,不同的时空模式,如斑块、斑点甚至混沌,都是基于物种扩散速率而出现的。利用弱非线性多尺度分析技术和泰勒级数展开,推导出振幅方程。介绍了一种新的正弦插值方法。数值模拟阐明了扩散和图灵参数之间的相互作用。在二维领域,空间模式分析说明人口密度动态导致孤立的群体,斑点,条纹,或迷宫的模式。仿真结果验证了该方法的有效性。文章最后讨论了这些结果的生物学意义。
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引用次数: 0
Numerical Investigation of MHD Carreau Nanofluid Flow with Nonlinear Thermal Radiation and Joule Heating by Employing Darcy–Forchheimer Effect over a Stretching Porous Medium 基于Darcy-Forchheimer效应的MHD carau纳米流体非线性热辐射和焦耳加热的数值研究
Q2 MATHEMATICS, APPLIED Pub Date : 2023-10-09 DOI: 10.1155/2023/5495140
Endale Ersino Bafe, Mitiku Daba Firdi, Lemi Guta Enyadene
Heat transfer in fluid mechanisms has a stronghold in everyday activities. To this end, nanofluids take a leading position in the advent of the betterment of thermal conductivity. The present study examines numerical investigations of incompressible magnetohydrodynamic (MHD) flow of Carreau nanofluid by considering nonlinear thermal radiation, Joule heating, temperature-dependent heat source/sink, and chemical reactions with attached Brownian movement and thermophoresis above a stretching sheet that saturates the porous medium. Pertaining similarity assumptions are used to change the flow equations into tractable forms of higher order nonlinear ordinary differential equations (ODEs). The continuation technique is adopted in the MATLAB bvp4c package for the numerical outcomes. The velocity, temperature, and nanoparticle concentration distributions in contrast to the leading parameters are availed in graphical and tabular descriptions. Among the many outcomes, increasing the radiation parameter from 0.2 to 0.8 surged the heat transfer rate by 47.78 % at n = 1.5 and lifted it only by 8.5 % at n = 0.5. By boosting the magnetic parameter from 0 to 1.5, respective 37.64 % and 20.17 % rises in local drag forces are achieved in shear-thickening and thinning regions. On top of that, chemical reactions and Brownian motion parameters decay the concentration field. The distinctiveness of this method is that a solution is secured for the problem, which is highly sensitive to initial and boundary conditions. It will be worth mentioning that these fluid flow models will be applicable in various fields, such as engineering, petroleum, nuclear safety processes, and medical science.
流体机制中的传热在日常活动中占有重要地位。为此,纳米流体在改善导热性方面处于领先地位。本研究通过考虑非线性热辐射、焦耳加热、温度相关热源/热源以及在饱和多孔介质的拉伸薄片上附带布朗运动和热电泳的化学反应,对不可压缩磁流体(MHD)流动进行了数值研究。利用相应的相似性假设将流动方程转化为可处理的高阶非线性常微分方程。在MATLAB bvp4c包中对数值结果采用延拓技术。速度、温度和纳米颗粒浓度分布与主要参数的对比以图形和表格的形式描述。在众多结果中,当n = 1.5时,将辐射参数从0.2增加到0.8,传热率提高了47.78%,而当n = 0.5时,传热率仅提高了8.5%。当磁性参数从0提高到1.5时,剪切增厚和减薄区域的局部阻力分别提高了37.64%和20.17%。最重要的是,化学反应和布朗运动参数会使浓度场衰减。该方法的特点是对初始条件和边界条件高度敏感,求解是安全的。值得一提的是,这些流体流动模型将适用于各个领域,如工程、石油、核安全过程和医学。
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引用次数: 0
Cost-Effectiveness Analysis of the Optimal Control Strategies for Multidrug-Resistant Tuberculosis Transmission in Ethiopia 埃塞俄比亚耐多药结核病传播最优控制策略的成本-效果分析
Q2 MATHEMATICS, APPLIED Pub Date : 2023-09-28 DOI: 10.1155/2023/8822433
Ashenafi Kelemu Mengistu, Peter J. Witbooi
Despite the recent progress of global control efforts, tuberculosis (TB) remains a significant public health threat worldwide, especially in developing countries, including Ethiopia. Furthermore, the emergence of multidrug-resistant tuberculosis (MDR-TB) has further complicated the situation. This study aims at identifying the most effective strategies for combating MDR-TB in Ethiopia. We first present a compartmental model of MDR-TB transmission dynamics in Ethiopia. The model is shown to have positive solutions, and the stability of the equilibrium points is analyzed. Then, we extend the model by incorporating time-dependent control variables. These control variables are vaccination, distancing, and treatment for DS-TB and MDR-TB. Finally, the optimality system is numerically simulated by considering different combinations of the strategies, and their cost effectiveness is analysed. Our finding shows that, among single control strategies, the successful treatment of drug-susceptible tuberculosis (DS-TB) is the most effective control factor for eliminating MDR-TB transmission in Ethiopia. Furthermore, within the six dual control strategies, the combination of distancing and successful treatment of DS-TB is less costly and more effective than other strategies. Finally, out of the triple control strategies, the combination of distancing, successful treatment for DS-TB, and treatment for MDR-TB is the most efficient strategy for curbing the MDR-TB disease in Ethiopia. Thus, to reduce MDR-TB efficiently, it is recommended that authorities focus on treating MDR-TB, effective treatment of DS-TB, and promoting social distancing through public health education and awareness programs.
尽管最近全球控制努力取得了进展,但结核病仍然是世界范围内的一个重大公共卫生威胁,特别是在包括埃塞俄比亚在内的发展中国家。此外,耐多药结核病(MDR-TB)的出现使情况进一步复杂化。这项研究的目的是确定在埃塞俄比亚防治耐多药结核病的最有效战略。我们首先提出了埃塞俄比亚耐多药结核病传播动态的分区模型。证明了模型存在正解,并分析了平衡点的稳定性。然后,我们通过引入时变控制变量来扩展模型。这些控制变量是接种疫苗、保持距离以及DS-TB和MDR-TB的治疗。最后,通过考虑不同策略组合对优化系统进行了数值模拟,并对其成本效益进行了分析。我们的发现表明,在单一控制策略中,成功治疗药物敏感结核病(DS-TB)是消除埃塞俄比亚耐多药结核病传播的最有效控制因素。此外,在六种双重控制战略中,保持距离和成功治疗DS-TB的结合比其他战略成本更低,也更有效。最后,在三重控制战略中,保持距离、成功治疗DS-TB和治疗耐多药结核病相结合是埃塞俄比亚遏制耐多药结核病的最有效战略。因此,为了有效地减少耐多药结核病,建议当局将重点放在治疗耐多药结核病、有效治疗DS-TB以及通过公共卫生教育和意识规划促进社会距离上。
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引用次数: 0
Group Analysis Explicit Power Series Solutions and Conservation Laws of the Time-Fractional Generalized Foam Drainage Equation 时间分数型广义泡沫排水方程的群分析、显式幂级数解及守恒律
IF 1.6 Q2 MATHEMATICS, APPLIED Pub Date : 2023-08-29 DOI: 10.1155/2023/8241804
Maria Ihsane El Bahi, K. Hilal
In this study, the classical Lie symmetry method is successfully applied to investigate the symmetries of the time-fractional generalized foam drainage equation with the Riemann–Liouville derivative. With the help of the obtained Lie point symmetries, the equation is reduced to nonlinear fractional ordinary differential equations (NLFODEs) which contain the Erdélyi–Kober fractional differential operator. The equation is also studied by applying the power series method, which enables us to obtain extra solutions. The obtained power series solution is further examined for convergence. Conservation laws for this equation are obtained with the aid of the new conservation theorem and the fractional generalization of the Noether operators.
本文成功地应用经典李对称方法研究了具有Riemann-Liouville导数的时间分数型广义泡沫排水方程的对称性。利用所得到的Lie点对称性,将方程简化为包含erdsamlyi - kober分数阶微分算子的非线性分数阶常微分方程(NLFODEs)。应用幂级数法对方程进行了研究,得到了额外的解。进一步检验了所得幂级数解的收敛性。利用新的守恒定理和Noether算子的分数推广,得到了该方程的守恒定律。
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引用次数: 0
On Stabilizability of Nonbilinear Perturbed Descriptor Systems 非线性摄动广义系统的稳定性
IF 1.6 Q2 MATHEMATICS, APPLIED Pub Date : 2023-08-14 DOI: 10.1155/2023/5561224
Ghazwa F. Abd
One way in which nonlinear descriptor systems of (index-k) naturally arise is through semiexplicit differential-algebraic equations. The study considers the nonbilinear dynamical systems which are described by the class of higher-index differential-algebraic equations (DAEs). Their nature is analysed both quantitatively and qualitatively, and stability characteristics are presented for their solution. Higher-index differential-algebraic systems seem to show inherent shaky around their solution manifolds. The often use of logarithmic norms is for the estimation of stability and perturbation bounds in linear ordinary differential equations (ODEs). The question of how to apply the notation of logarithmic norms to nonlinear DAEs has long been an open question. Other problem extensions including nonlinear dynamics and nonbilinear DAEs need subtle modification of the logarithmic norms. The logarithmic norm is combined by conceptual focus with the finite-time stability criterion in order to treat nonbilinear DAEs with the aim of covering some unbounded operators. This means we obtain the perturbation bounds from differential inequalities for a norm by the use of the relationship between Dini derivatives and semi-inner products. A numerical result obtained when tested on the nonbilinear mechanical system with a larger scale showed that the method was highly efficient and accurate and particularly suitable for nonbilinear DAEs.
(index-k)的非线性描述系统自然产生的一种方法是通过半显式微分代数方程。研究了一类用高指标微分代数方程(DAEs)来描述的非线性动力系统。对其性质进行了定性和定量分析,并给出了其解的稳定性特征。高指标微分代数系统似乎在其解流形周围表现出固有的不稳定性。对数范数通常用于估计线性常微分方程的稳定性和摄动界。如何将对数范数表示法应用于非线性DAEs一直是一个悬而未决的问题。其他问题的扩展,包括非线性动力学和非线性双线性DAEs,需要对对数范数进行细微的修改。通过概念焦点将对数范数与有限时间稳定性判据相结合,以覆盖一些无界算子为目标来处理非线性DAEs。这意味着我们利用Dini导数与半内积之间的关系,从范数的微分不等式中获得了扰动界。在非双线性机械系统上进行了大规模的数值试验,结果表明,该方法具有较高的效率和精度,特别适用于非双线性DAEs。
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引用次数: 0
Oscillation and Asymptotic Behavior of Three-Dimensional Third-Order Delay Systems 三维三阶时滞系统的振动性和渐近性
IF 1.6 Q2 MATHEMATICS, APPLIED Pub Date : 2023-06-08 DOI: 10.1155/2023/9939317
Ahmed Abdul Hasan Naeif, Hussain A. Mohamad
In this paper, oscillation and asymptotic behavior of three-dimensional third-order delay systems are discussed. Some sufficient conditions are obtained to ensure that every solution of the system is either oscillatory or nonoscillatory and converges to zero or diverges as t goes to infinity. A special technique is adopted to include all possible cases for all nonoscillatory solutions (NOSs). The obtained results included illustrative examples.
本文讨论了三维三阶时滞系统的振动性和渐近性。得到了系统的每一个解在t趋于无穷时收敛于零或发散的振荡解或非振荡解的充分条件。采用了一种特殊的技术来包括所有非振荡解(NOSs)的所有可能情况。所得结果包括举例说明。
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引用次数: 0
Solving the Fractional Schrödinger Equation with Singular Initial Data in the Extended Colombeau Algebra of Generalized Functions 广义函数的扩展Colombeau代数中初始数据奇异的分数阶Schrödinger方程的求解
IF 1.6 Q2 MATHEMATICS, APPLIED Pub Date : 2023-05-02 DOI: 10.1155/2023/3493912
Ali El Mfadel, S. Melliani, A. Taqbibt, M. Elomari
<jats:p>This manuscript aims to highlight the existence and uniqueness results for the following Schrödinger problem in the extended Colombeau algebra of generalized functions. <jats:inline-formula> <math xmlns="http://www.w3.org/1998/Math/MathML" id="M1"> <mfenced open="{" close="" separators="|"> <mrow> <mtable class="smallmatrix"> <mtr> <mtd> <mrow> <mn>1</mn> <mo>/</mo> <mrow> <mi>ı</mi> <mrow> <mi>∂</mi> <mo>/</mo> <mrow> <mi>∂</mi> <mi>t</mi> </mrow> </mrow> </mrow> </mrow> <mi mathvariant="fraktur">u</mi> <mrow> <mfenced open="(" close=")" separators="|"> <mrow> <mi>t</mi> <mo>,</mo> <mi>x</mi> </mrow> </mfenced> </mrow> <mo>−</mo> <mo mathvariant="fraktur">△</mo> <mi mathvariant="fraktur">u</mi> <mrow> <mfenced open="(" close=")" separators="|"> <mrow> <mi>t</mi> <mo>,</mo> <mi>x</mi> </mrow> </mfenced> </mrow> <mo>+</mo> <mi>v</mi> <mrow> <mfenced open="(" close=")" separators="|"> <mrow> <mi>x</mi>
本文的目的是强调以下Schrödinger问题在广义函数的扩展Colombeau代数中的存在唯一性结果。
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引用次数: 0
On the Existence and Stability of Bounded Solutions for Abstract Dynamic Equations on Time Scales 时间尺度上抽象动力方程有界解的存在性与稳定性
IF 1.6 Q2 MATHEMATICS, APPLIED Pub Date : 2023-04-29 DOI: 10.1155/2023/8489196
C. Duque, H. Leiva, R. Gallo, A. Tridane
In this article we study the existence and stability of bounded solutions for semilinear abstract dynamic equations on time scales in Banach spaces. In order to do so, we use the definition of the Riemann delta-integral to prove a result about closed operator in Banach spaces and then we just use the representation of bounded solutions as an improper delta-integral from minus infinite to t . We prove the existence, uniqueness, and exponential stability of such bounded solutions. As particular cases, we study the existence of periodic and almost periodic solutions as well. Finally, we present some equations on time scales where our results can be applied.
本文研究了Banach空间上半线性抽象动力方程有界解的存在性和稳定性。为此,我们利用黎曼积分的定义来证明巴拿赫空间中闭算子的一个结果,然后将有界解表示为从负无穷到t的反常积分。证明了这类有界解的存在性、唯一性和指数稳定性。作为特殊情况,我们也研究了周期解和概周期解的存在性。最后,我们给出了一些可以应用我们的结果的时间尺度方程。
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引用次数: 0
Existence and Uniqueness of Renormalized Solution to Nonlinear Anisotropic Elliptic Problems with Variable Exponent and L� < 变指数、L <的非线性各向异性椭圆问题重正化解的存在唯一性
IF 1.6 Q2 MATHEMATICS, APPLIED Pub Date : 2023-04-10 DOI: 10.1155/2023/9454714
Ibrahime Konaté, Arouna Ouédraogo
Nonlinear partial differential equations are considered as an essential tool for describing the behavior of many natural phenomena. The modeling of some phenomena requires to work in Sobolev spaces with constant exponent. But for others, such as electrorheological fluids, the properties of classical spaces are not sufficient to have precision. To overcome this difficulty, we work in the appropriate spaces called Lebesgue and Sobolev spaces with variable exponent. In recent works, researchers are attracted by the study of mathematical problems in the context of variable exponent. This great interest is motivated by their applications in many fields such as elastic mechanics, fluid dynamics, and image restoration. In this paper, we combine the technic of monotone operators in Banach spaces and approximation methods to prove the existence of renormalized solutions of a class of nonlinear anisotropic problem involving p ⟶ . − Leray–Lions operator, a graph, and L 1 data. In particular, we establish the uniqueness of the solution when the graph data are considered a strictly increasing function.
非线性偏微分方程被认为是描述许多自然现象行为的重要工具。一些现象的建模需要在指数不变的Sobolev空间中进行。但对于其他流体,如电流变流体,经典空间的性质不足以具有精度。为了克服这一困难,我们在称为Lebesgue和Sobolev空间的具有可变指数的适当空间中工作。在最近的工作中,研究人员被可变指数背景下的数学问题的研究所吸引。它们在弹性力学、流体力学和图像恢复等许多领域的应用激发了人们的极大兴趣。本文将Banach空间中的单调算子技术与逼近方法相结合,证明了一类含p的非线性各向异性问题重整化解的存在性⟶ . − Leray–Lions算子、一张图和L1数据。特别地,当图数据被认为是严格递增函数时,我们建立了解的唯一性。
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引用次数: 0
期刊
International Journal of Differential Equations
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