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Adaptive extragradient methods for solving variational inequalities in real Hilbert spaces 求解实数Hilbert空间中变分不等式的自适应梯度方法
IF 1.5 4区 工程技术 Q2 Mathematics Pub Date : 2022-09-19 DOI: 10.1515/ijnsns-2021-0459
Duong Viet Thong, Xiao-Huan Li, Q. Dong, Hoang Van Thang, Luong Van Long
Abstract The projection technique is a very important method and efficient for solving variational inequality problems. In this study, we developed the subgradient extragradient method for solving pseudomonotone variational inequality in real Hilbert spaces. Our first algorithm requires only computing one projection onto the feasible set per iteration and the strong convergence is proved without the prior knowledge of the Lipschitz constant as well as the sequentially weak continuity of the associated mapping. The second algorithm uses the linesearch procedure such that its convergence does not require the Lipschitz continuous condition of the variational inequality mapping. Finally, some numerical experiments are provided to demonstrate the advantages and efficiency of the proposed methods.
摘要投影技术是求解变分不等式问题的一种非常重要和有效的方法。在这项研究中,我们发展了求解实Hilbert空间中伪单调变分不等式的次梯度外方法。我们的第一个算法每次迭代只需要在可行集上计算一个投影,并且在没有Lipschitz常数的先验知识以及相关映射的顺序弱连续性的情况下证明了强收敛性。第二种算法使用线性搜索过程,使得其收敛性不需要变分不等式映射的Lipschitz连续条件。最后,通过数值实验验证了所提方法的优越性和有效性。
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引用次数: 0
Global stability for a SEIQR worm propagation model in mobile internet 移动互联网中SEIQR蠕虫传播模型的全局稳定性
IF 1.5 4区 工程技术 Q2 Mathematics Pub Date : 2022-08-19 DOI: 10.1515/ijnsns-2021-0186
L. Zhang, Pengyan Liu
Abstract Recently, propagation models of worms in the mobile environment are drawing extensive attention, particularly in the Wi-Fi scenario. Considering that worm-free equilibrium is exponential convergent means that the propagation time and control time of worms are much shorter than for other asymptotic convergence. Besides, the global asymptotic stability of the endemic equilibrium is more important than the local asymptotic stability, which reflects the more global qualitative behavior of the worm propagation. In this paper, we discuss the global dynamics of SEIQR worm propagation model in mobile internet proposed by Xiao et al. [X. Xiao, P. Fu, C. Dou, Q. Li, G. Hu, and S. Xia, “Design and analysis of SEIQR worm propagation model in mobile internet,” Commun. Nonlinear Sci. Numer. Simulat., vol. 43, pp. 341–350, 2017] to improve and complement the related results. Through a series of mathematical derivations, sufficient conditions are derived to ensure the global exponentially stability of worm-free equilibrium, and the exponential convergent rate can be unveiled. Then, by using the classical geometric approach, it is shown that the endemic equilibrium is globally asymptotically stable and the system is persistent when R 0 > 1. Moreover, numerical simulations are given to demonstrate our theoretical results.
近年来,蠕虫在移动环境下的传播模式受到了广泛关注,尤其是在Wi-Fi场景下。考虑无虫平衡是指数收敛的,意味着蠕虫的传播时间和控制时间比其他渐近收敛的情况要短得多。此外,地方性平衡的全局渐近稳定性比局部渐近稳定性更重要,反映了蠕虫传播的全局定性行为。本文讨论了Xiao等人提出的移动互联网中SEIQR蠕虫传播模型的全局动态。肖平,傅平,窦晨,李强,胡国光,夏生,“移动互联网中SEIQR蠕虫传播模型的设计与分析”,通信学报。非线性科学。号码。装病者。[中文],vol. 43, pp. 341-350, 2017]以完善和补充相关结果。通过一系列数学推导,得到了保证无虫平衡全局指数稳定的充分条件,并揭示了指数收敛速率。然后,利用经典的几何方法,证明了当R为0时,系统的局部平衡点是全局渐近稳定的,系统是持久的。通过数值模拟验证了理论结果。
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引用次数: 0
Buoyancy driven flow characteristics inside a cavity equiped with diamond elliptic array 菱形椭圆阵列空腔内浮力驱动的流动特性
IF 1.5 4区 工程技术 Q2 Mathematics Pub Date : 2022-08-18 DOI: 10.1515/ijnsns-2021-0073
R. Chaabane, L. Kolsi, A. Jemni, A. D'Orazio
Abstract This study numerically investigates the two-dimensional natural convection in a square enclosure with an isothermal diamond elliptic array at Rayleigh numbers of 104 ≤ Ra ≤ 107. Three cases are considered, i.e., case 1 where two pairs of circular heating bodies are used inside the cavity, one is placed on the vertical centerline (VC) of the cavity and the other on the horizontal centerline (HC), case 2 where one pair of horizontal elliptic heating bodies is placed on the VC of the cavity and the other on the HC and case 3 where the horizontal elliptic heating bodies are replaced by vertical elliptic heating bodies. Numerical simulation was carried out based on the mesoscopic approach (LBM). The effects of the horizontally and vertically heated arrays were investigated. We demonstrate that, only when the Rayleigh number increases to Ra = 107, the numerical solutions reach an unsteady state for all cases. The transition of the flow regime from the unsteady state to the steady state depends on the variation in the ratio of the elliptical cylinder.
摘要本研究数值研究了瑞利数为104≤Ra≤107时,具有等温菱形椭圆阵列的方形外壳中的二维自然对流。考虑了三种情况,即情况1,其中在空腔内使用两对圆形加热体,一对放置在空腔的垂直中心线(VC)上,另一对放置于水平中心线(HC)上,其中一对水平椭圆形加热体放置在空腔的VC上而另一对放置在HC上的情况2,以及其中水平椭圆形加热主体被垂直椭圆形加热体代替的情况3。基于细观方法进行了数值模拟。研究了水平和垂直加热阵列的影响。我们证明,只有当瑞利数增加到Ra=107时,数值解才能在所有情况下达到非定常状态。流态从非定常状态到稳态的转变取决于椭圆圆柱体比率的变化。
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引用次数: 0
M-lump waves and their interactions with multi-soliton solutions for the (3 + 1)-dimensional Jimbo–Miwa equation (3+1)维Jimbo–Miwa方程的M-块波及其与多孤子解的相互作用
IF 1.5 4区 工程技术 Q2 Mathematics Pub Date : 2022-08-09 DOI: 10.1515/ijnsns-2021-0468
H. Ismael, S. El‐Ganaini, H. Bulut
Abstract In this work, the dynamical behaviors of the Jimbo–Miwa equation that describes certain interesting (3 + 1)-dimensional waves in physics but does not pass any of the conventional integrability tests are studied. One-, two-, and three-M-lump waves are constructed successfully. Interactions between one-M-lump and one-soliton wave, between one-M-lump and two-soliton wave as well as between two-M-lump and one-soliton solution are reported. Also, complex multi-soliton, solutions are offered. The simplified Hirota’s method and a long-wave method are used to construct these types of solutions. The velocity of a one-M-lump wave is studied. Straight Lines of travel for M-lump waves are also reported. To our knowledge, all gained solutions in this research paper are novel and not reported beforehand. Moreover, the gained solutions are presented graphically in three dimensions to better understand the physical phenomena of the suggested equation.
本文研究了Jimbo-Miwa方程的动力学行为,该方程描述了物理学中某些有趣的(3 + 1)维波,但没有通过任何常规的可积性检验。成功地构造了一m、二m和三m块波。报道了单m块与单孤子波、单m块与双孤子波、双m块与单孤子解之间的相互作用。并给出了复杂多孤子的解决方案。用简化的Hirota法和长波法来构造这类解。研究了1m块波的速度。m块波的直线传播也有报道。据我们所知,本研究论文所获得的所有解决方案都是新颖的,没有事先报道过。此外,获得的解以三维图形形式呈现,以便更好地理解所建议方程的物理现象。
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引用次数: 2
Optimal control for a class of fractional order neutral evolution equations 一类分数阶中立型发展方程的最优控制
IF 1.5 4区 工程技术 Q2 Mathematics Pub Date : 2022-08-09 DOI: 10.1515/ijnsns-2021-0410
He Yang, Jihong Wang
Abstract The optimal control, for a class of nonlinear neutral evolution equations involving Riemann–Liouville fractional derivative, is investigated in this paper by using Darbo–Sadovskii fixed point theorem. An example is given in the last section to illustrate the validity of the abstract conclusions.
摘要利用Darbo–Sadovski不动点定理研究了一类包含Riemann–Liouville分数导数的非线性中立型发展方程的最优控制。最后一节给出了一个例子来说明抽象结论的有效性。
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引用次数: 0
Shehu transform on time-fractional Schrödinger equations – an analytical approach 时间分数阶薛定谔方程的Shehu变换——一种分析方法
IF 1.5 4区 工程技术 Q2 Mathematics Pub Date : 2022-08-08 DOI: 10.1515/ijnsns-2021-0423
Mamta Kapoor
Abstract In the present study, time-fractional Schrödinger equations are dealt with for the analytical solution using an integral transform named Shehu Transform. Three kinds of time-fractional Schrödinger equations are discussed in the present study. Shehu transform is utilized to reduce the time-fractional PDE along with the fractional derivative in the Caputo sense. The present method is easy to implement in the search for an analytical solution. As no discretization or numerical program is required, the present scheme will surely be helpful in finding the analytical solution to some complex-natured fractional PDEs.
摘要在本研究中,使用一种称为Shehu变换的积分变换来处理时间分数阶薛定谔方程的解析解。本文讨论了三类时间分数阶薛定谔方程。Shehu变换用于减少时间分数PDE以及Caputo意义上的分数导数。本方法在寻找分析解决方案时易于实现。由于不需要离散化或数值程序,本文的格式肯定有助于找到一些复杂性质的分数阶偏微分方程的解析解。
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引用次数: 2
Trajectory controllability of nonlinear fractional Langevin systems 非线性分式Langevin系统的轨迹可控性
IF 1.5 4区 工程技术 Q2 Mathematics Pub Date : 2022-08-05 DOI: 10.1515/ijnsns-2021-0358
Govindaraj Venkatesan, Suresh Kumar Pitchaikkannu
Abstract In this paper, we discuss the trajectory controllability of linear and nonlinear fractional Langevin dynamical systems represented by the Caputo fractional derivative by using the Mittag–Leffler function and Gronwall–Bellman inequality. For the nonlinear system, we assume Lipschitz-type conditions on the nonlinearity. Examples are given to illustrate the theoretical results.
摘要本文利用Mittag–Leffler函数和Gronwall–Bellman不等式,讨论了以Caputo分数导数表示的线性和非线性分数Langevin动力系统的轨迹可控性。对于非线性系统,我们假定非线性的Lipschitz型条件。举例说明了理论结果。
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引用次数: 1
Optimal control of non-instantaneous impulsive second-order stochastic McKean–Vlasov evolution system with Clarke subdifferential 具有Clarke子微分的非瞬时脉冲二阶随机McKean-Vlasov演化系统的最优控制
IF 1.5 4区 工程技术 Q2 Mathematics Pub Date : 2022-08-03 DOI: 10.1515/ijnsns-2021-0321
K. Anukiruthika, N. Durga, P. Muthukumar
Abstract The optimal control of non-instantaneous impulsive second-order stochastic McKean–Vlasov evolution system with Clarke subdifferential and mixed fractional Brownian motion is investigated in this article. The deterministic nonlinear second-order controlled partial differential system is enriched with stochastic perturbations, non-instantaneous impulses, and Clarke subdifferential. In particular, the nonlinearities in the system that rely on the state of the solution are allowed to rely on the corresponding probability distribution of the state. The solvability of the considered system is discussed with the help of stochastic analysis, multivalued analysis, and multivalued fixed point theorem. Further, the existence of optimal control is established with the aid of Balder’s theorem. Finally, an example is provided to illustrate the developed theory.
研究了具有Clarke次微分和混合分数布朗运动的非瞬时脉冲二阶随机McKean-Vlasov演化系统的最优控制问题。确定性非线性二阶控制偏微分系统丰富了随机扰动、非瞬时脉冲和Clarke子微分。特别是,允许系统中依赖于解的状态的非线性依赖于相应状态的概率分布。利用随机分析、多值分析和多值不动点定理,讨论了所考虑系统的可解性。进一步利用Balder定理,证明了最优控制的存在性。最后,给出了一个实例来说明所建立的理论。
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引用次数: 0
Mathematical model of fluid flow in a double constricted tapered tube with permeable boundary 具有可渗透边界的双收缩锥形管中流体流动的数学模型
IF 1.5 4区 工程技术 Q2 Mathematics Pub Date : 2022-07-11 DOI: 10.1515/ijnsns-2021-0244
Varunkumar Merugu, Muthu Poosan
Abstract In this paper, a mathematical model for the steady laminar, incompressible and Newtonian fluid flow in a proximal renal tubule is presented. In this, the tubule is considered as a tapered tube with double constriction and permeable boundary. The impact of the fluid reabsorption across the tubule wall is assumed as the occurrence of exponentially decreasing flow at each cross-section. The present model is formulated through the Navier–Stokes equations, under the appropriate boundary conditions. A regular perturbation technique is used to obtain the approximate solutions. This study brings out the significant impacts of reabsorption coefficient (α) and tapered angle (ϕ) on the flow variables such as velocities, the drop in pressure, and wall shear stress are discussed through graphs. The streamlines are also plotted to understand the influence of the reabsorption and tapering phenomena on the flow.
摘要本文建立了近端肾小管内稳态层流、不可压缩和牛顿流体流动的数学模型。在这种情况下,小管被认为是一个具有双重收缩和可渗透边界的锥形管。跨小管壁的流体再吸收的影响被假设为在每个横截面处发生指数递减的流动。本模型是通过Navier-Stokes方程在适当的边界条件下建立的。利用正则摄动技术得到近似解。本研究通过图表讨论了再吸收系数(α)和锥角(ξ)对流速、压降和壁剪切应力等流动变量的显著影响。还绘制了流线,以了解再吸收和锥形现象对流量的影响。
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引用次数: 0
Generalized forms of fractional Euler and Runge–Kutta methods using non-uniform grid 使用非均匀网格的分数Euler和Runge–Kutta方法的广义形式
IF 1.5 4区 工程技术 Q2 Mathematics Pub Date : 2022-07-08 DOI: 10.1515/ijnsns-2021-0278
Pushpendra Kumar, V. S. Erturk, M. Murillo‐Arcila, C. Harley
Abstract In this article, we propose generalized forms of three well-known fractional numerical methods namely Euler, Runge–Kutta 2-step, and Runge–Kutta 4-step, respectively. The new versions we provide of these methods are derived by utilizing a non-uniform grid which is slightly different from previous versions of these algorithms. A new generalized form of the well-known Caputo-type fractional derivative is used to derive the results. All necessary analyses related to the stability, convergence, and error bounds are also provided. The precision of all simulated results is justified by performing multiple numerical experiments, with some meaningful problems solved by implementing the code in Mathematica. Finally, we give a brief discussion on the simulated results which shows that the generalized methods are novel, effective, reliable, and very easy to implement.
摘要本文分别给出了欧拉法、龙格-库塔2步法和龙格-库塔4步法这三种著名的分数阶数值方法的推广形式。我们提供的这些方法的新版本是通过使用非均匀网格派生的,这与这些算法的先前版本略有不同。利用著名的caputo型分数阶导数的一种新的推广形式来推导结果。文中还对稳定性、收敛性和误差界进行了必要的分析。通过多次数值实验验证了所有模拟结果的精度,并在Mathematica中实现了一些有意义的问题。最后,对仿真结果进行了简要讨论,结果表明,该方法新颖、有效、可靠,易于实现。
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引用次数: 8
期刊
International Journal of Nonlinear Sciences and Numerical Simulation
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