{"title":"A class of flexible and efficient partitioned Runge-Kutta-Chebyshev methods for some time-dependent partial differential equations","authors":"Xiao Tang , Junwei Huang","doi":"10.1016/j.cnsns.2026.109643","DOIUrl":"10.1016/j.cnsns.2026.109643","url":null,"abstract":"<div><div>In the present paper, we construct a new class of second-order partitioned explicit stabilized methods for the ordinary differential equations (ODEs) containing moderately stiff and non-stiff terms, which are usually obtained after the spatial semi-discretization of the time-dependent partial differential equations (PDEs). We treat the moderately stiff term with an <em>s</em>-stage Runge-Kutta-Chebyshev (RKC) method and treat the non-stiff term with a 4<em>m</em>-stage explicit Runge-Kutta (RK) method. Different from several existing partitioned explicit stabilized methods that employ fixed-stage RK methods to handle the non-stiff term, both the parameters <em>s</em> and <em>m</em> in our methods can be flexibly adjusted as needed for the problems. Numerical experiments and comparisons with several existing partitioned explicit stabilized methods show the flexibility and efficiency of our new partitioned methods.</div></div>","PeriodicalId":50658,"journal":{"name":"Communications in Nonlinear Science and Numerical Simulation","volume":"157 ","pages":"Article 109643"},"PeriodicalIF":3.8,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145995143","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}
{"title":"Stability of the ideal magnetohydrodynamic equations with horizontal dissipation","authors":"Bo Xu , Fan Wu , Jiang Zhou","doi":"10.1016/j.cnsns.2026.109792","DOIUrl":"10.1016/j.cnsns.2026.109792","url":null,"abstract":"<div><div>This paper investigates the stability of the two-dimensional ideal magnetohydrodynamic equations with only horizontal dissipation. By exploiting the symmetry conditions imposed on the initial data and time-weighted energy estimates, we establish the global stability of this system near the background magnetic field (1,0) in the space <em>H</em><sup>3</sup>. Furthermore, an algebraic decay rate of (<em>u</em><sub>2</sub>, <em>b</em><sub>2</sub>) is obtained in the <em>H</em><sup>2</sup> framework. The results reveal that the magnetic field introduces an additional smoothing effect, thereby stabilizing fluid motion.</div></div>","PeriodicalId":50658,"journal":{"name":"Communications in Nonlinear Science and Numerical Simulation","volume":"157 ","pages":"Article 109792"},"PeriodicalIF":3.8,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146047904","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}
{"title":"Time-fractional diffusion problem with fixed memory length in 1D finite space domain: Exact and approximate solutions","authors":"Malgorzata Klimek , Tomasz Blaszczyk","doi":"10.1016/j.cnsns.2026.109739","DOIUrl":"10.1016/j.cnsns.2026.109739","url":null,"abstract":"<div><div>We study the time-fractional diffusion equation with fixed memory length in a finite one-dimensional spatial domain. The time derivative is expressed by the left-sided Caputo fractional derivative with fixed memory, which leads to solution behavior distinct from both classical diffusion and full-memory fractional diffusion. We construct the exact solution using eigenfunction expansions and derive several of its properties, including convergence and regularity. The time evolution and diffusion speed is discussed in detail and results on comparison between classical diffusion problem and time-fractional problems with different memory lengths are included. Additionally, we propose an approximate solution by truncating the series and provide error estimates to control the approximation accuracy. The presented examples illustrate the influence of memory length and fractional order on the obtained solution.</div></div>","PeriodicalId":50658,"journal":{"name":"Communications in Nonlinear Science and Numerical Simulation","volume":"157 ","pages":"Article 109739"},"PeriodicalIF":3.8,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145957179","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}
Ayyappan N , Gunasekaran Nallappan , Manivannan A , Lakshmanan S
{"title":"Finite-time H∞ boundedness of delayed interconnected systems using sliding mode control with partitioned interval strategy","authors":"Ayyappan N , Gunasekaran Nallappan , Manivannan A , Lakshmanan S","doi":"10.1016/j.cnsns.2026.109673","DOIUrl":"10.1016/j.cnsns.2026.109673","url":null,"abstract":"<div><div>This work investigates the problem of finite-time boundedness (FTB) of interconnected systems with time delays in the interconnections, using sliding mode control (SMC) along with a partitioned interval strategy. The finite-time interval [0, <em>T</em>] is divided into two sub-intervals: <span><math><mrow><mo>[</mo><mn>0</mn><mo>,</mo><mi>T</mi><mo>]</mo></mrow></math></span> and <span><math><mrow><mo>[</mo><mi>T</mi><mo>,</mo><mi>T</mi><mo>]</mo></mrow></math></span>, where <span><math><mrow><mi>T</mi><mo><</mo><mi>T</mi></mrow></math></span>. A novel sliding mode surface (SMS) is designed, and an equivalent control is derived from the SMS. Furthermore, an SMC with a reaching law is designed to counteract disturbances and ensure that the system reaches the SMS within a finite-time. By utilizing this property, the SMC with the reaching law is applied to the first sub interval <span><math><mrow><mo>[</mo><mn>0</mn><mo>,</mo><mi>T</mi><mo>]</mo></mrow></math></span>, while the equivalent control derived from the SMS is applied to maintain the states within the SMS for the remaining interval <span><math><mrow><mo>[</mo><mi>T</mi><mo>,</mo><mi>T</mi><mo>]</mo></mrow></math></span>. Moreover, by considering a Lyapunov-Krasovskii functional, sufficient conditions are derived in the form of linear matrix inequalities to guarantee the <em>H</em><sub>∞</sub> FTB of the system. Finally, two examples are given to demonstrate the effectiveness of the proposed SMC and sufficient conditions, with simulation results confirming the FTB of the proposed model.</div></div>","PeriodicalId":50658,"journal":{"name":"Communications in Nonlinear Science and Numerical Simulation","volume":"157 ","pages":"Article 109673"},"PeriodicalIF":3.8,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145957188","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}
Xuexi Zhang , Hekai Feng , Chaojie Cheng , Zhenyu Wu , Qiang Ni , Jie Tao
{"title":"Dynamic event-triggered anti-synchronization for Markov jump neural networks with partially unknown probabilities and cyber attacks","authors":"Xuexi Zhang , Hekai Feng , Chaojie Cheng , Zhenyu Wu , Qiang Ni , Jie Tao","doi":"10.1016/j.cnsns.2026.109656","DOIUrl":"10.1016/j.cnsns.2026.109656","url":null,"abstract":"<div><div>This article investigates anti-synchronization control for Markov jump neural networks with partially unknown probabilities under energy-constrained attacks. First, to deal with the mixed-type attacks and asynchronous phenomena, a controller based on the hidden Markov model with partially unknown probabilities is established. To conserve valuable communication resources and reduce the influence caused by denial of service attacks, a novel dynamic event-triggered scheme is developed, capable of predicting and adapting to malicious attack occurrences by weighting modulation. Sufficient conditions are then obtained to guarantee the drive and response systems achieve <em>H</em><sub>∞</sub> anti-synchronization by resorting to linear matrix inequalities. The effectiveness of the proposed anti-synchronization scheme is demonstrated through a numerical example. Finally, a secure communication system, leveraging the proposed anti-synchronization system, is constructed and its encryption security is analyzed with an image encryption example.</div></div>","PeriodicalId":50658,"journal":{"name":"Communications in Nonlinear Science and Numerical Simulation","volume":"157 ","pages":"Article 109656"},"PeriodicalIF":3.8,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145969429","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}
{"title":"Backward problem in a coupled time-fractional reaction diffusion system by optimization method","authors":"Liangliang Sun, Zhaoqi Zhang","doi":"10.1016/j.cnsns.2026.109778","DOIUrl":"10.1016/j.cnsns.2026.109778","url":null,"abstract":"<div><div>In this paper, we study a backward problem in a system controlled by two coupled time-fractional diffusion equations from the final measurement data. Firstly, we prove the well-posedness of the state problem by introducing the Riemann-Liouville weak formulation, and give some regularity results of the solution to the state problem by employing the properties of the Mittag-Leffler function. In order to solve this inverse problem, we then transform it into a least square optimization problem. Subsequently, we establish the existence of the minimizer and also prove its uniqueness and a stability estimates with respect to the input data. Finally, we provide some numerical results for the optimal control problem using the Landweber iterative method.</div></div>","PeriodicalId":50658,"journal":{"name":"Communications in Nonlinear Science and Numerical Simulation","volume":"157 ","pages":"Article 109778"},"PeriodicalIF":3.8,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146033547","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}
{"title":"Dynamic analysis of a stochastic three species predator-prey model with intraguild predation and predator-switching","authors":"Yonghui Lv , Hui Wang , Jian Ding , Quanxin Zhu","doi":"10.1016/j.cnsns.2026.109748","DOIUrl":"10.1016/j.cnsns.2026.109748","url":null,"abstract":"<div><div>In this paper, we consider the effects of intraguild predation, predator-switching, and stochastic factors on the dynamics of a stochastic three species predator-prey model. It is assumed that the interactions between the two predators and the prey follow the Holling type II functional response. Meanwhile, the predation between the top predator and the intermediate predator is governed by a preference mechanism modulated by prey density. The existence of positive solutions and the boundedness are established. The analysis of the Lyapunov exponents reveals that intraguild predation and predator-switching can maintain species coexistence under certain conditions. Furthermore, we provide a comprehensive classification of persistence and extinction for all populations. Finally, we conduct numerical simulations to verify the theoretical results by employing the Monte Carlo method to calculate the Lyapunov exponents of the two-dimensional boundary measures.</div></div>","PeriodicalId":50658,"journal":{"name":"Communications in Nonlinear Science and Numerical Simulation","volume":"157 ","pages":"Article 109748"},"PeriodicalIF":3.8,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145995140","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}
Yiming Shang , Guangbin Cai , Xiangwei Bu , Chaoxu Mu , Tong Wu , Hui Xu
{"title":"Prescribed performance sliding mode synchronization of chaotic systems via neural network-based disturbance observer","authors":"Yiming Shang , Guangbin Cai , Xiangwei Bu , Chaoxu Mu , Tong Wu , Hui Xu","doi":"10.1016/j.cnsns.2026.109753","DOIUrl":"10.1016/j.cnsns.2026.109753","url":null,"abstract":"<div><div>In this paper, a novel prescribed performance sliding mode control strategy integrated with a neural network-based disturbance observer (NDO) is proposed to achieve fast and robust synchronization of chaotic systems. First, the synchronization error is transformed from the error domain (<em>e</em>-domain) to the performance domain (<em>ζ</em>-domain) by employing a prescribed performance function. Subsequently, based on the transformed error dynamics, a sliding mode surface that incorporates a delayed feedback term is designed. A synchronization controller is then developed based on the proposed sliding mode surface. To enhance system robustness against unknown disturbances, a neural network-based disturbance observer is introduced to estimate and compensate for uncertainties in real time. The stability of the closed-loop synchronization error system is rigorously proved based on the Lyapunov-Krasovskii (L-K) functional method. Finally, numerical simulation results are presented to demonstrate the effectiveness and superior performance of the proposed control strategy.</div></div>","PeriodicalId":50658,"journal":{"name":"Communications in Nonlinear Science and Numerical Simulation","volume":"157 ","pages":"Article 109753"},"PeriodicalIF":3.8,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145995148","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}
{"title":"Model-free adaptive control with independent time-varying parameters for containment control in multi-agent systems","authors":"Fei Yan , Hao Wang , Yingmin Yi","doi":"10.1016/j.cnsns.2026.109766","DOIUrl":"10.1016/j.cnsns.2026.109766","url":null,"abstract":"<div><div>This paper proposes a novel model-free adaptive control with independent time-varying parameters (MFAC-ITVP) framework for containment control in nonlinear multi-agent systems (MASs). Unlike conventional MFAC schemes that require globally homogeneous controller parameters, the proposed framework allows each agent to autonomously adjust its controller gains through independently evolving time-varying parameters. This independence significantly enhances adaptability and robustness, especially under dynamic communication topologies and varying agent participation. By transforming nonlinear agent dynamics into local data-driven linear models through dynamic linearization, a fully distributed control law is developed that depends solely on local input–output data without any prior model knowledge. Rigorous theoretical analysis establishes convergence and stability in the maximum-norm sense under generalized Lipschitz conditions. Extensive simulations under both fixed and switching topologies verify that the proposed MFAC-ITVP method achieves faster convergence and stronger disturbance rejection compared with traditional MFAC approaches.</div></div>","PeriodicalId":50658,"journal":{"name":"Communications in Nonlinear Science and Numerical Simulation","volume":"157 ","pages":"Article 109766"},"PeriodicalIF":3.8,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146014494","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}
{"title":"Approximation-free full-state error constrained distributed formation control with unified preset-time performance","authors":"Yiwei Liu , Ning Pang , Ziming Wang , Xin Wang","doi":"10.1016/j.cnsns.2026.109727","DOIUrl":"10.1016/j.cnsns.2026.109727","url":null,"abstract":"<div><div>This paper proposes a unified preset-time formation control framework for multi-input multi-output (MIMO) uncertain nonlinear systems. The framework is built upon a newly developed family of performance functions that ensure all error signals remain within prescribed boundaries and converge to arbitrarily designated sets within a preset time, independent of their initial conditions. In contrast to existing MIMO control schemes that rely on adaptive parameter estimation or disturbance observers, the proposed strategy achieves an approximation-free design, thereby simplifying the overall control architecture. To realize prescribed performance control (PPC) for agents with arbitrarily bounded initial states, a novel transformation mechanism is incorporated, which further avoids dependence on the homogeneity of agents’ dynamics. An event-triggered mechanism is also integrated to reduce communication burden between controllers and actuators, while rigorous analysis guarantees boundedness of all closed-loop signals and strictly excludes Zeno behavior. The effectiveness and advantages of the proposed approach are validated through numerical simulations of spacecraft formation control.</div></div>","PeriodicalId":50658,"journal":{"name":"Communications in Nonlinear Science and Numerical Simulation","volume":"157 ","pages":"Article 109727"},"PeriodicalIF":3.8,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145957223","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}