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Averaged Control Problems Governed by a Semilinear Distributed Systems 半线性分布式系统的平均控制问题
IF 0.5 Q2 MATHEMATICS Pub Date : 2023-05-12 DOI: 10.1155/2023/6687006
R. Zine, Hamed Ould Sidi, Y. Louartassi, M. Ould Sidi
In this work, we consider the regional averaged controllability (RAC) problem governed by a class of semilinear hyperbolic systems. We start by giving the definitions of the exact and approximate RAC systems. After that, we state the problem of RAC for semilinear systems. We propose two methods of solution: using a condition of the analytical operator to the nonlinear part of the system to characterize the optimal control via the fixed point theorem and the Hilbert Uniqueness Method (HUM) with an asymptotic condition on the nonlinear part to find the optimal control of the considered problem. Finally, we present a numerical example to show the effectiveness of the main results.
本文研究一类半线性双曲型系统的区域平均可控性问题。我们首先给出精确和近似RAC系统的定义。然后,讨论了半线性系统的RAC问题。我们提出了两种解决方法:利用系统非线性部分的解析算子的条件通过不动点定理来表征最优控制;利用非线性部分的渐近条件的Hilbert唯一性方法(HUM)来寻找所考虑问题的最优控制。最后,通过数值算例验证了主要结果的有效性。
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引用次数: 0
Analytical Solutions for Unsteady Thin Film Flow with Internal Heating and Radiation 非定常薄膜内加热辐射流动的解析解
IF 0.5 Q2 MATHEMATICS Pub Date : 2023-05-12 DOI: 10.1155/2023/5612023
Ahsan Ali Naseer, M. Safdar, S. Taj, M. U. Ali, A. Zafar, Kwanghyok Kim, Jong Hyuk Byun
This study determines Lie point symmetries for differential equations that mathematically express a time-dependent thin film fluid flow with internal heating and thermal radiation to construct invariants. These invariants are used in the derivation of similarity transformations for reducing the flow equations into systems of equations that possess only one independent variable. The homotopy analysis method is employed to analytically solve the reduced system of equations. The new similarity transformations and the corresponding analytical solutions comprehensively consider flow dynamics and heat transfer under multiple physical conditions. These solutions are presented graphically to demonstrate the effects of variations in the radiative heat flux with internal heating on the flow dynamics and heat transfer properties. Moreover, the variations in fluid dynamics are described graphically using the obtained analytical homotopy solution under different values of the unsteadiness parameter and Prandtl number.
本研究确定了具有内部加热和热辐射的随时间变化的薄膜流体流动的微分方程的李点对称性,以构造不变量。这些不变量用于推导相似变换,将流动方程简化为只有一个自变量的方程组。采用同伦分析方法解析求解简化方程组。新的相似变换和相应的解析解综合考虑了多种物理条件下的流动动力学和传热。这些解以图形的形式展示了内加热时辐射热通量的变化对流动动力学和传热性能的影响。此外,利用得到的解析同伦解,用图形描述了在不同非定常参数和普朗特数下流体动力学的变化。
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引用次数: 0
Orthogonal Inner Product Graphs over Finite Fields of Odd Characteristic 奇特征有限域上的正交内积图
IF 0.5 Q2 MATHEMATICS Pub Date : 2023-05-11 DOI: 10.1155/2023/6811540
Shouxiang Zhao, Hengbin Zhang, J. Nan, Gaohua Tang
<jats:p>Let <jats:inline-formula> <math xmlns="http://www.w3.org/1998/Math/MathML" id="M1"> <msub> <mrow> <mi mathvariant="double-struck">F</mi> </mrow> <mrow> <mi>q</mi> </mrow> </msub> </math> </jats:inline-formula> be a finite field of odd characteristic and <jats:inline-formula> <math xmlns="http://www.w3.org/1998/Math/MathML" id="M2"> <mn>2</mn> <mi>ν</mi> <mo>+</mo> <mi>δ</mi> <mo>≥</mo> <mn>2</mn> </math> </jats:inline-formula> be an integer with <jats:inline-formula> <math xmlns="http://www.w3.org/1998/Math/MathML" id="M3"> <mi>δ</mi> <mo>=</mo> <mn>0,1</mn> </math> </jats:inline-formula>, or 2. The orthogonal inner product graph <jats:inline-formula> <math xmlns="http://www.w3.org/1998/Math/MathML" id="M4"> <mi>O</mi> <mi>i</mi> <mfenced open="(" close=")" separators="|"> <mrow> <mn>2</mn> <mi>ν</mi> <mo>+</mo> <mi>δ</mi> <mo>,</mo> <mi>q</mi> </mrow> </mfenced> </math> </jats:inline-formula> over <jats:inline-formula> <math xmlns="http://www.w3.org/1998/Math/MathML" id="M5"> <msub> <mrow> <mi mathvariant="double-struck">F</mi> </mrow> <mrow> <mi>q</mi> </mrow> </msub> </math> </jats:inline-formula> is defined, and a class of subgroup of the automorphism groups of <jats:inline-formula> <math xmlns="http://www.w3.org/1998/Math/MathML" id="M6"> <mi>O</mi> <mi>i</mi> <mfenced open="(" close=")" separators="|"> <mrow> <mn>2</mn> <mi>ν</mi> <mo>+</mo> <mi>δ</mi> <mo>,</mo> <mi>q</mi>
设F q为奇特征有限场,且2 ν + δ≥2为δ = 0、1或2的整数。正交内积图O i 2 ν + δ,q / fq是有定义的,并确定了O 2 ν + δ, q的自同构群的一类子群。我们发现O i 2 ν + δ,当2 ν + δ = 2时,Q为不连通图;否则,它不是。并给出了O i 2 ν + δ, q,分别在o2ν + δ自同构群的子群作用下处于同一轨道上,问 .
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引用次数: 0
Mathematical Modeling of Feelings in Viewpoint of Analysis of Olvido Poetry with Fractional Operators 从奥维多诗歌的分数算子分析看情感的数学建模
IF 0.5 Q2 MATHEMATICS Pub Date : 2023-05-10 DOI: 10.1155/2023/5862652
M. Dokuyucu, Burak Armağan, Ülkü Eliuz, A. Akdemir, Mehmet Emir Köksal
The main motivation point of the article and the main factor that provides originality are an analysis of the modeling of feelings in the perspective of the analysis of Olvido’s poetry with the help of two fractional operators that offer the most effective solutions to real-world problems. In the study, first of all, the effect and contribution of fractional analysis to be applied and theoretical sciences were examined. A mathematical model of the feelings described in Olvido’s poem has been created to establish an important connection between fractional operators, which are an effective tool in the explanation of many physical and applied phenomena, and literary works that try to describe human life and feelings. The solutions of this model are investigated with the help of Caputo and Atangana–Baleanu fractional derivative operators. The findings were supported by various graphics in the light of special values of the parameters of the operators. The study focuses on generalizing the effects of literature research on human life to a general framework, not only providing the realization of the outputs that the literature field brings to human life and literature with the help of a mathematical model. The study has a rare content in the literature in terms of bringing together poetry and mathematics, which deal with human life with different methodologies.
本文的主要动机点和提供原创性的主要因素是从分析奥维多诗歌的角度分析情感的建模,借助两个分数算子为现实世界的问题提供最有效的解决方案。在本研究中,首先考察了分数分析在应用科学和理论科学方面的作用和贡献。在Olvido的诗中描述的情感的数学模型已经被创建,以建立分数算子之间的重要联系,分数算子是解释许多物理和应用现象的有效工具,以及试图描述人类生活和情感的文学作品。利用Caputo和Atangana-Baleanu分数阶导数算子研究了该模型的解。根据操作员的特殊参数值,各种图形支持了这些发现。研究的重点是将文学研究对人类生活的影响概括到一个总体框架中,而不仅仅是借助数学模型来实现文学领域给人类生活和文学带来的输出。该研究将诗歌和数学结合在一起,用不同的方法处理人类生活,这在文学中是罕见的内容。
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引用次数: 0
On the Global Well-Posedness for a Hyperbolic Model Arising from Chemotaxis Model with Fractional Laplacian Operator 分数阶拉普拉斯算子化学趋向性模型衍生的双曲型模型的全局适定性
IF 0.5 Q2 MATHEMATICS Pub Date : 2023-05-09 DOI: 10.1155/2023/1140032
Oussama Melkemi, Mohammed S Abdo, M. A. Aiyashi, M. D. Albalwi
Several cells and microorganisms, such as bacteria and somatic, have many essential features, one of which can be modeled by the chemotaxis system, which we consider to be our main interest in this article. More precisely, we studied the hyperbolic system derived from the chemotaxis model with fractional dissipation, which is a generalization for the hyperbolic system with classical dissipation. The results of this article are divided into two parts. In the first part, we used energy methods to obtain the existence of small solutions in the Besov spaces. The second one deals with the optimal decay of perturbed solutions using a refined time-weighted energy combined with the Littlewood-Paley decomposition technique. To the authors’ best knowledge, this type of system (with fractional dissipation) has not been studied in the literature.
几种细胞和微生物,如细菌和体细胞,具有许多基本特征,其中一个特征可以通过趋化系统来建模,我们认为这是我们在本文中的主要兴趣。更确切地说,我们研究了由具有分数耗散的趋化模型导出的双曲型系统,它是具有经典耗散的双曲型系统的推广。本文的研究结果分为两部分。在第一部分中,我们利用能量方法得到了Besov空间中小解的存在性。第二种方法是利用精细的时间加权能量与Littlewood-Paley分解技术相结合来处理摄动解的最优衰减。据作者所知,这种类型的系统(具有分数耗散)尚未在文献中研究过。
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引用次数: 1
Numerical Solutions of Time-Fractional Whitham–Broer–Kaup Equations via Sumudu Decomposition Method 时间分数阶Whitham-Broer-Kaup方程的Sumudu分解数值解
IF 0.5 Q2 MATHEMATICS Pub Date : 2023-05-09 DOI: 10.1155/2023/4664866
Shams A. Ahmed, Mohamed Elbadri, Abdelgabar Adam Hassan, Walid Hdidi
In this paper, the coupled system of Whitham–Broer–Kaup equations of the Caputo fractional derivative (CFD) is studied using the Sumudu decomposition method (SDM). Using different dispersion relations, these equations are needed to describe the properties of waves in shallow water. The current investigation for the future scheme includes convergence and error analysis. We use two examples to demonstrate the leverage and effectiveness of the proposed scheme, and the error analysis is discussed to ensure its accuracy. The numerical simulation is carried out to ensure the accuracy of the future technique. The obtained numerical and graphical results are presented, and the proposed scheme is computationally very accurate and simple to study and solve fractionally coupled nonlinear complex phenomena encountered in science and technology.
本文采用Sumudu分解方法(SDM)研究了Caputo分数阶导数(CFD)的Whitham-Broer-Kaup方程耦合系统。使用不同的色散关系,需要这些方程来描述浅水中波浪的性质。目前对未来方案的研究包括收敛性和误差分析。通过两个算例验证了该方法的有效性和有效性,并对误差分析进行了讨论,以保证其准确性。为了保证未来技术的准确性,进行了数值模拟。给出了所得的数值和图形结果,表明所提出的方案计算精度高,易于研究和解决科学技术中遇到的分数耦合非线性复杂现象。
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引用次数: 0
Analysis of a Two-Phase MHD Free Convection Generalized Water–Ethylene Glycol (50 : 50) Dusty Brinkman-Type Nanofluid Pass through Microchannel 两相MHD自由对流广义水-乙二醇(50:50)Dusty brinkman型纳米流体通过微通道的分析
IF 0.5 Q2 MATHEMATICS Pub Date : 2023-05-09 DOI: 10.1155/2023/3099858
Dolat Khan, M. Almusawa, Waleed Hamali, M. A. Akbar
The water–ethylene glycol (50 : 50) nanofluid has applications in the manufacture of polyester as a raw agent, air conditioning systems, antifreeze formulation, dehydrating agents in the gas industry, a precursor in the plastic industry, and convective heat transfer. These developments in nanotechnology and nanoscience have caught the interest of several researchers. Because it keeps machines and engines cool by reducing friction between their different parts, grease is a vital part of many machinery and engines. Also, due to the extensive use of fractional derivatives, this work seeks to evaluate the combined impacts of free convection flow and heat transfer, magnetic field, and Brinkman-type water–ethylene glycol (50 : 50) dusty nanofluid among microchannel. The flow that the buoyant force provides helps to carry heat naturally via convection. While the left plate moves at a consistent velocity and the right plate stays stationary, the fluid is also evenly dispersed with all dust particles that have a spherical form. Partial differential equations (PDE) are used to present the mathematical modeling. The resultant PDEs are generalized by utilizing the Caputo–Fabrizio fractional derivative. The problem’s closed-form solution is produced by combining a Laplace transformation with a finite sine Fourier transformation. It has also been studied that temperature, Brinkman nanofluid, and dust particle velocity relate to a variety of other factors, such as the magnetic parameter, Grashof number, dusty fluid parameter, and volume friction parameter. The graphical outcomes for the dusty fluid, Brinkman nanofluid, and temperature profiles are plotted using Mathcad-15. The Brinkman nanofluid and dusty fluid behave similarly for a variety of embedded factors. It is found that compared to the traditional one, the fractional dusty nanofluid model displays more realistic characteristics. The addition of nanoparticles in water–ethylene glycol (50 : 50) dusty nanofluid enhances the rate of heat transfer up to 41.04478% by increasing their volume fractional.
水-乙二醇(50:50)纳米流体可作为聚酯原料、空调系统、防冻剂配方、气体工业中的脱水剂、塑料工业中的前驱体以及对流传热等领域的应用。纳米技术和纳米科学的这些发展引起了一些研究人员的兴趣。润滑脂是许多机器和发动机的重要组成部分,因为它通过减少不同部件之间的摩擦来保持机器和发动机的冷却。此外,由于分数导数的广泛使用,本工作旨在评估微通道中自由对流流动和传热、磁场和布林克曼型水-乙二醇(50:50)含尘纳米流体的综合影响。浮力提供的流动有助于通过对流自然地携带热量。当左板以一致的速度移动而右板保持静止时,流体也均匀地分散在所有具有球形的尘埃颗粒中。采用偏微分方程(PDE)进行数学建模。利用Caputo-Fabrizio分数阶导数对所得偏微分方程进行了推广。这个问题的封闭解是通过拉普拉斯变换和有限正弦傅里叶变换的结合得到的。还研究了温度、布林克曼纳米流体和粉尘颗粒速度与各种其他因素的关系,如磁性参数、格拉什夫数、粉尘流体参数和体积摩擦参数。使用Mathcad-15绘制了含尘流体、布林克曼纳米流体和温度曲线的图形结果。布林克曼纳米流体和灰尘流体对于各种嵌入因素的行为相似。实验结果表明,与传统模型相比,分级含尘纳米流体模型更具有真实的特性。在水-乙二醇(50:50)含尘纳米流体中加入纳米颗粒,通过增加其体积分数,传热率提高到41.04478%。
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引用次数: 1
An Efficient Algorithm for Decomposition of Partially Ordered Sets 部分有序集分解的一种有效算法
IF 0.5 Q2 MATHEMATICS Pub Date : 2023-05-09 DOI: 10.1155/2023/9920700
E. Badr, Mohamed EL-Hakeem, E. El-Sharawy, Thowiba E. Ahmed
Efficient time complexities for partial ordered sets or posets are well-researched field. Hopcroft and Karp introduced an algorithm that solves the minimal chain decomposition in O (n2.5) time. Felsner et al. proposed an algorithm that reduces the time complexity to O (kn2) such that n is the number of elements of the poset and k is its width. The main goal of this paper is proposing an efficient algorithm to compute the width of a given partially ordered set P according to Dilworth’s theorem. It is an efficient and simple algorithm. The time complexity of this algorithm is O (kn), such that n is the number of elements of the partially ordered set P and k is the width of P. The computational results show that the proposed algorithm outperforms other related algorithms.
偏序集或偏序集的有效时间复杂度是研究的热点。Hopcroft和Karp介绍了一种算法,可以在O (n2.5)时间内解决最小链分解问题。Felsner等人提出了一种将时间复杂度降低到O (kn2)的算法,其中n为偏置集的元素个数,k为偏置集的宽度。本文的主要目的是根据迪尔沃斯定理,提出一种计算给定偏序集P宽度的有效算法。它是一种高效、简单的算法。该算法的时间复杂度为O (kn),其中n为部分有序集合P的元素个数,k为P的宽度。计算结果表明,该算法优于其他相关算法。
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引用次数: 0
M-Hazy Module and Its Homomorphism Theorem M-Hazy模及其同态定理
IF 0.5 Q2 MATHEMATICS Pub Date : 2023-05-09 DOI: 10.1155/2023/3581113
Donghua Huo, Hongyu Liu
Based on a completely distributive lattice M , we propose a new fuzzification approach to a module, which leads to the concept of an M -hazy module. Different from the traditional fuzzification approach that defines a fuzzy algebra as a fuzzy subset of a classical algebra, we introduce an M -hazy module by fuzzifications of algebraic operations. Then, we investigate the fundamental properties of M -hazy modules and M -hazy submodules. In particular, we present the M -hazy module homomorphism theorem.
基于完全分布格M,我们提出了一种新的模模糊化方法,从而引出了M -模糊模的概念。与传统的模糊化方法将模糊代数定义为经典代数的模糊子集不同,我们通过代数运算的模糊化引入了M -模糊模块。然后,我们研究了M -hazy模和M -hazy子模的基本性质。特别地,我们给出了M -朦胧模同态定理。
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引用次数: 0
Modeling the Effects of Algal Bloom on Dissolved Oxygen in Eutrophic Water Bodies 模拟富营养化水体中藻华对溶解氧的影响
IF 0.5 Q2 MATHEMATICS Pub Date : 2023-05-08 DOI: 10.1155/2023/2335570
B. Hasan, Md. Shaiful Islam, P. Kundu, Uzzwal Kumar Mallick
Algal blooms have a wide variety of detrimental effects on both the aquatic environment and human activities unfortunately, including a decrease in dissolved oxygen levels in water. In this study, a nonlinear mathematical model has been developed to study the effects of algal bloom on the depletion of dissolved oxygen in eutrophic water sources considering nutrient concentrations, density of algal population, detritus, and concentration of dissolved oxygen as variables. The model’s existence and uniqueness, stability at the equilibrium points, and characteristics with respect to state variables have been performed as some parts of analytical solution, whereas the numerical solution has been performed using the Runge–Kutta 4 t h order technique. The findings of this research reveal that an increase in the quantity of nutrients causes an algal bloom, which in turn lowers the equilibrium level of dissolved oxygen. However, higher levels of detritus ( > 4.7 mg/litre) are hazardous to the generation of dissolved oxygen in water systems. Maximum detritus of 1.0 mg/liter is required for fast algal and dissolved oxygen growth in water bodies; beyond that, algal and dissolved oxygen growth rates are lower. Therefore, increasing public awareness is an essential step in controlling this growing issue; failing to do so will result in problems for our water supply, which will in turn pose a danger to our ecosystem.
不幸的是,藻华对水生环境和人类活动都有各种各样的有害影响,包括水中溶解氧水平的降低。本文建立了一个非线性数学模型,以营养物浓度、藻类种群密度、碎屑和溶解氧浓度为变量,研究了富营养化水源中藻华对溶解氧消耗的影响。模型的存在唯一性、平衡点的稳定性以及关于状态变量的特性作为解析解的一部分进行了求解,而数值解则采用龙格-库塔4阶技术进行了求解。这项研究的结果表明,营养物数量的增加会导致藻华,这反过来又降低了溶解氧的平衡水平。然而,较高水平的碎屑(> 4.7毫克/升)对水系统中溶解氧的产生是有害的。水体中藻类和溶解氧快速生长所需的最大碎屑量为1.0 mg/l;除此之外,藻类和溶解氧的生长速度较低。因此,提高公众意识是控制这一日益严重问题的必要步骤;如果不这样做,我们的供水就会出现问题,这反过来又会对我们的生态系统构成威胁。
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引用次数: 0
期刊
Muenster Journal of Mathematics
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