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Pattern formation and spatiotemporal chaos in relativistic degenerate plasmas 相对论性简并等离子体中的模式形成和时空混沌
IF 3.8 2区 数学 Q1 MATHEMATICS, APPLIED Pub Date : 2026-01-24 DOI: 10.1016/j.cnsns.2026.109768
S. Das Adhikary, A.P. Misra
We numerically study the nonlinear interactions of high-frequency circularly polarized electromagnetic (EM) waves and low-frequency electron-acoustic (EA) density perturbations driven by the EM wave ponderomotive force in relativistic plasmas (moderate, strong, and ultra-relativistic) with two groups of electrons–the population of relativistic degenerate dense electrons (bulk plasma) and the sparse relativistic nondegenerate (classical) electrons, and immobile singly charged positive ions. By pattern selection, we show that many solitary patterns can be generated and drenched through modulational instability of EM waves at different spatial length scales and that the EM wave radiation spectra emanating from compact astrophysical objects may not settle into stable envelope solitons but into different incoherent states, including the emergence of temporal and spatiotemporal chaos due to collisions and fusions among the patterns with strong EA wave emission. The appearance of these states is confirmed by analyzing the Lyapunov exponent spectra, correlation function, and mutual information as quantitative evidence. As a result, the redistribution of wave energy from initially exciting many solitary patterns at large scales to a few new incoherent patterns with small wavelengths in the system occurs, leading to the onset of turbulence in astrophysical plasmas.
我们在数值上研究了高频圆极化电磁(EM)波和低频电子声(EA)密度微扰的非线性相互作用,这些微扰是由相对论性等离子体(中度、强和超相对论性)中的电磁波质动势驱动的,它们具有两组电子——相对论性简并密集电子(体等离子体)和稀疏相对论性非简并电子(经典)和不移动的单电荷正离子。通过模式选择,我们发现在不同的空间长度尺度下,电磁波的调制不稳定性可以产生许多孤立模式,并且紧凑天体发出的电磁波辐射谱可能不会进入稳定的包络孤子,而是进入不同的非相干状态,包括由于强EA波发射模式之间的碰撞和融合而产生的时间和时空混沌。通过分析李雅普诺夫指数谱、相关函数和互信息作为定量证据,证实了这些态的出现。结果,波能量从最初在大尺度上激发许多孤立模式到系统中一些新的小波长非相干模式的重新分配发生了,导致天体物理等离子体中湍流的开始。
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引用次数: 0
Contrast independent partially explicit splitting scheme for semi-linear multiscale wave equations with damping term 具有阻尼项的半线性多尺度波动方程的对比独立部分显式分裂格式
IF 3.8 2区 数学 Q1 MATHEMATICS, APPLIED Pub Date : 2026-01-24 DOI: 10.1016/j.cnsns.2026.109784
Zhengya Yang, Yating Wang
In this paper, we propose an efficient temporal splitting scheme for semi-linear wave equations with multiscale high contrast coefficient. We employed the central difference scheme to handle the first- and second-order temporal derivatives. Additionally, the nonlinear term is treated explicitly to avoid iterative solving at each time step. To address the multiscale high contrast features, we further introduce a partially explicit temporal splitting scheme. This scheme utilizes the constraint energy minimization generalized multiscale finite element method (CEM-GMsFEM) to construct two multiscale spaces, effectively separating the high contrast component from the background medium. Then the scheme treats implicitly the subspace containing the high contrast and explicitly the other, such that the time step size is independent of the high contrast. We proved energy decrease and stability, providing explicit stability conditions. Finally, serval numerical experiments demonstrated that our proposed algorithm achieves robust performance across varying multiscale parameters.
本文针对多尺度高对比度系数半线性波动方程,提出了一种有效的时间分裂方法。我们采用中心差分格式来处理一阶和二阶时间导数。此外,对非线性项进行了明确处理,避免了每个时间步的迭代求解。为了解决多尺度高对比度的特点,我们进一步引入了一种部分显式的时间分裂方案。该方案利用约束能量最小化广义多尺度有限元法(CEM-GMsFEM)构造两个多尺度空间,有效地将高对比度分量与背景介质分离。然后,该方案隐式处理包含高对比度的子空间,显式处理包含高对比度的子空间,使得时间步长与高对比度无关。我们证明了能量减少和稳定性,给出了明确的稳定性条件。最后,通过数值实验验证了该算法在不同多尺度参数下的鲁棒性。
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引用次数: 0
Enhanced vibration suppression of structures using an optimized serial single-sided vibro-impact bistable NES 利用优化的单面振动冲击双稳NES增强结构的振动抑制
IF 3.8 2区 数学 Q1 MATHEMATICS, APPLIED Pub Date : 2026-01-23 DOI: 10.1016/j.cnsns.2026.109763
Jiang Li, Gui-Lan Yu
The effectiveness of a nonlinear energy sink (NES) is highly dependent on the initial energy level. Its vibration suppression efficiency rapidly diminishes if the initial energy deviates from a certain range. To address this issue, the present paper combines the advantages of bistability with single-sided vibro-impact, and proposes a serially connected single-sided vibro-impact bistable NES (SSSVI-BNES) designed for targeted energy transfer (TET). Compared with bistable NES (BNES) and single-sided vibro-impact NES (SSVI-NES), the SSSVI-BNES effectively resolves the energy sensitivity and energy reflux problems without increasing total mass by connecting the oscillators in series. It broadens the effective energy range and greatly reduces the root mean square (RMS) displacement and maximum displacement of the primary structure, and demonstrates robust control over structural stiffness variations. The parameters of the SSSVI-BNES are optimized using an improved adaptive genetic algorithm (IAGA), significantly improving the vibration suppression effect. The complete source code is available at our github repository: https://github.com/LJ384.
非线性能量汇(NES)的有效性高度依赖于初始能级。当初始能量偏离一定范围时,其抑振效率迅速降低。为了解决这一问题,本文结合双稳定性与单面振动冲击的优点,提出了一种用于定向能量传递(TET)的串行连接单面振动冲击双稳态NES (SSSVI-BNES)。与双稳态振动冲击系统(BNES)和单侧振动冲击系统(SSVI-NES)相比,ssvi -BNES通过串联振荡器,在不增加总质量的前提下,有效地解决了能量敏感性和能量回流问题。该方法拓宽了有效能量范围,大大降低了主结构的均方根位移和最大位移,对结构刚度变化具有较强的控制能力。采用改进的自适应遗传算法(IAGA)对SSSVI-BNES的参数进行优化,显著提高了振动抑制效果。完整的源代码可在我们的github存储库:。
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引用次数: 0
Energy-decreasing parametric finite element method for geodesic Willmore flow 测地线Willmore流的降能参数有限元法
IF 3.8 2区 数学 Q1 MATHEMATICS, APPLIED Pub Date : 2026-01-23 DOI: 10.1016/j.cnsns.2026.109783
Cuiling Ma, Xufeng Xiao, Xiaoling Zhang, Xinlong Feng
We propose an energy-decreasing numerical scheme for the geodesic Willmore flow of closed curves on curved surfaces. This geometric flow characterizes the evolution of curves toward the minimization of the geodesic Willmore energy. Our main contributions are the derivation of novel evolution equations governing both the curve parameterization and geodesic curvature, the development of a stable fully discrete approximation combining the linear parametric finite elements in space with the implicit Euler in time, and a rigorous proof of discrete energy decay for the proposed scheme. The method effectively captures curve evolution on implicit surfaces. In addition, we generalize the energy-decreasing framework to the anisotropic geodesic Willmore flow and propose a BDF2 scheme. Through numerical experiments, we demonstrate the convergence and energy-decreasing property of the proposed approach, validating its effectiveness.
我们提出了曲面上闭曲线测地线Willmore流的能量递减数值格式。这种几何流的特征是曲线向测地线威尔莫尔能量最小化的演变。我们的主要贡献是推导了控制曲线参数化和测地线曲率的新型演化方程,开发了一个稳定的全离散近似,将空间中的线性参数有限元与时间中的隐式欧拉结合起来,并严格证明了所提出方案的离散能量衰减。该方法有效地捕捉了隐式曲面上的曲线演化过程。此外,我们将能量递减框架推广到各向异性测地线Willmore流中,并提出了BDF2格式。通过数值实验证明了该方法的收敛性和降能性,验证了该方法的有效性。
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引用次数: 0
A novel deep neural network with the dynamical moving window data for nonlinear system identification 一种新的具有动态移动窗口数据的非线性系统辨识深度神经网络
IF 3.9 2区 数学 Q1 MATHEMATICS, APPLIED Pub Date : 2026-01-22 DOI: 10.1016/j.cnsns.2026.109670
Yanjiao Wang, Zhaogui Cai, Muqing Deng
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引用次数: 0
Novel subgradient extragradient methods for equilibrium problems in Hilbert spaces 希尔伯特空间平衡问题的新次梯度外聚方法
IF 3.9 2区 数学 Q1 MATHEMATICS, APPLIED Pub Date : 2026-01-22 DOI: 10.1016/j.cnsns.2026.109777
Pham Ky Anh, Ngo Thi Thuong, Nguyen The Vinh
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引用次数: 0
Credit risk for large portfolios of green and brown loans: extending the ASRF model 大型绿色和棕色贷款组合的信用风险:扩展ASRF模型
IF 3.9 2区 数学 Q1 MATHEMATICS, APPLIED Pub Date : 2026-01-22 DOI: 10.1016/j.cnsns.2026.109750
A. Ramponi, S. Scarlatti
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引用次数: 0
Lazy-learning-based Koopman model predictive control for synchronization of unknown nonlinear systems 基于延迟学习的未知非线性系统同步库普曼模型预测控制
IF 3.8 2区 数学 Q1 MATHEMATICS, APPLIED Pub Date : 2026-01-22 DOI: 10.1016/j.cnsns.2026.109746
Xinlong Xu , Xia Huang , Qingyu Shi , Zhen Wang
This paper studies the synchronization problem of a class of unknown nonlinear systems. In response to the challenges in controller design resulting from unknown models, a lazy-learning-based Koopman model predictive control (LL-KMPC) strategy is proposed. The distinctiveness of the proposed control strategy is twofold: (i) exploitation of the global linearization property of the Koopman operator, enabling linear-control methods for synchronization control of unknown nonlinear systems; and (ii) integration of lazy learning (LL), which substantially reduces model mismatch in Koopman-based modeling. Moreover, theoretical results prove that the synchronization error is bounded under the proposed control strategy. Finally, two examples are provided to verify the effectiveness of the proposed control strategy. The experimental results demonstrate that the introduction of the LL technique can effectively improve the modeling performance, and compared to the model-free adaptive control (MFAC) and the model-free adaptive predictive control (MFAPC) approaches, the LL-KMPC strategy exhibits a faster convergence rate and a smaller synchronization error.
研究了一类未知非线性系统的同步问题。针对未知模型给控制器设计带来的挑战,提出了一种基于惰性学习的Koopman模型预测控制(LL-KMPC)策略。该控制策略的独特之处在于:(i)利用Koopman算子的全局线性化特性,使线性控制方法能够用于未知非线性系统的同步控制;(ii)懒学习(LL)的集成,这大大减少了基于koopman的建模中的模型不匹配。此外,理论结果证明了在该控制策略下,同步误差是有界的。最后,通过两个算例验证了所提控制策略的有效性。实验结果表明,引入LL- kmpc技术可以有效地提高建模性能,与无模型自适应控制(MFAC)和无模型自适应预测控制(MFAPC)方法相比,LL- kmpc策略具有更快的收敛速度和更小的同步误差。
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引用次数: 0
Lyapunov methods for dissipative Caputo fractional differential equations with two indices 双指标耗散卡普托分数阶微分方程的Lyapunov方法
IF 3.8 2区 数学 Q1 MATHEMATICS, APPLIED Pub Date : 2026-01-22 DOI: 10.1016/j.cnsns.2026.109737
Peter E. Kloeden , Doan Thai Son , Hoang The Tuan
The asymptotic behaviour of a class of dissipative Caputo fractional differential equations with two indices is investigated. Using Lyapunov methods and a comparison principle, results on ultimate boundedness and Mittag-Leffler stability are obtained for these systems. Two examples illustrate these results.
研究了一类双指标耗散Caputo分数阶微分方程的渐近性质。利用Lyapunov方法和比较原理,得到了这些系统的极限有界性和Mittag-Leffler稳定性。两个例子说明了这些结果。
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引用次数: 0
Backward problem in a coupled time-fractional reaction diffusion system by optimization method 用最优化方法求解耦合时间-分数反应扩散系统的逆向问题
IF 3.8 2区 数学 Q1 MATHEMATICS, APPLIED Pub Date : 2026-01-22 DOI: 10.1016/j.cnsns.2026.109778
Liangliang Sun, Zhaoqi Zhang
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.
本文从最终测量数据出发,研究了由两个耦合时间分数扩散方程控制的系统的后向问题。首先,通过引入Riemann-Liouville弱公式证明了状态问题的适定性,并利用Mittag-Leffler函数的性质给出了状态问题解的一些正则性结果。为了解决这个反问题,我们将其转化为最小二乘优化问题。随后,我们建立了最小器的存在性,并证明了它的唯一性和一个关于输入数据的稳定性估计。最后,用Landweber迭代法给出了最优控制问题的一些数值结果。
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Communications in Nonlinear Science and Numerical Simulation
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