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Reconstruction in the Calderón problem on a fixed partition from finite and partial boundary data 在有限和部分边界数据的固定分割上重建Calderón问题
IF 2.8 2区 数学 Q1 MATHEMATICS, APPLIED Pub Date : 2025-12-04 DOI: 10.1016/j.aml.2025.109841
Henrik Garde
This short note modifies a reconstruction method by the author Garde (2020), for reconstructing piecewise constant conductivities in the Calderón problem (electrical impedance tomography). In the former paper, a layering assumption and the local Neumann-to-Dirichlet map were needed since the piecewise constant partition also was assumed unknown. Here I show how to modify the method in case the partition is known, for general piecewise constant conductivities and only a finite number of partial boundary measurements. Moreover, no lower/upper bounds on the unknown conductivity are needed.
这篇简短的笔记修改了作者Garde(2020)的重建方法,用于重建Calderón问题(电阻抗断层扫描)中的分段恒定电导率。在前一篇文章中,由于假设分段常数划分是未知的,因此需要分层假设和局部neumann - dirichlet映射。在这里,我展示了如何在分区已知的情况下修改方法,对于一般的分段常数电导率和只有有限数量的部分边界测量。此外,未知电导率不需要下限/上限。
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引用次数: 0
Energy decay for evolution equations with glassy type memory 具有玻璃型记忆的演化方程的能量衰减
IF 2.8 2区 数学 Q1 MATHEMATICS, APPLIED Pub Date : 2025-11-28 DOI: 10.1016/j.aml.2025.109834
Paola Loreti, Daniela Sforza
In this paper, we address the question of estimating the energy decay of integrodifferential evolution equations with glassy memory. This class of memory kernel was not analyzed in previous studies. Moreover, a detailed analysis provides an explicit estimate of the connection between the kernel function’s decay constant and the energy’s decay constant.
本文研究了具有玻璃记忆的积分-微分演化方程的能量衰减估计问题。这类内存核在以前的研究中没有被分析过。此外,详细的分析提供了核函数衰减常数与能量衰减常数之间联系的显式估计。
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引用次数: 0
Global existence of solutions to the Poisson–Nernst–Planck–Fourier system near nonconstant equilibria 泊松-能斯特-普朗克-傅立叶系统非常平衡态解的整体存在性
IF 2.8 2区 数学 Q1 MATHEMATICS, APPLIED Pub Date : 2025-11-27 DOI: 10.1016/j.aml.2025.109833
Chia-Yu Hsieh , Yongting Huang , Jiaqi Ren
We consider the Poisson–Nernst–Planck–Fourier system for the non-isothermal ionic transport. With the presence of permanent charges, the system admits nonconstant equilibria. In this paper, we prove the global well-posedness around nonconstant equilibria of the system.
我们考虑了非等温离子输运的泊松-能斯特-普朗克-傅立叶系统。随着永久电荷的存在,系统允许非恒定平衡。在本文中,我们证明了系统围绕非常平衡点的全局适定性。
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引用次数: 0
Nodal solutions for a Choquard equation involving the p-Laplacian operator 含p -拉普拉斯算子的Choquard方程的节点解
IF 2.8 2区 数学 Q1 MATHEMATICS, APPLIED Pub Date : 2025-11-25 DOI: 10.1016/j.aml.2025.109832
Xudong Shang
In this paper, we consider the following Choquard equation involving the p-Laplacian operator Δpu+|u|p2u=(Iα|u|q)|u|q2uinRN,where 2p<N, pq<p(N+α)2(Np), and Iα is the Riesz potential of order α((N2p)+,N). By using the Ekeland variational principle and the implicit function theorem, we obtain the problem has a radial nodal solution for q(p,p(N+α)2(Np)). For the case of q=p, we employ the least energy radial nodal solution of q>p pass to a limit procedure qp to obtain our result. This article extends some results of related literatures.
本文考虑了包含p-拉普拉斯算子- Δpu+|u|p−2u=(Iα * |u|q)|u|q−2winrn的下列Choquard方程,其中2≤p<;N, p≤q<p(N+α)2(N−p),且Iα是阶α∈((N−2p)+,N)的Riesz势。利用Ekeland变分原理和隐函数定理,得到了q∈(p,p(N+α)2(N−p))的径向节点解。对于q=p的情况,我们利用q>;p的最小能量径向节点解通过一个极限过程q→p来得到我们的结果。本文扩展了相关文献的一些结果。
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引用次数: 0
Integrable semi-discretization of the Kuralay-II equation and its positon solutions Kuralay-II方程的可积半离散化及其位置解
IF 2.8 2区 数学 Q1 MATHEMATICS, APPLIED Pub Date : 2025-11-25 DOI: 10.1016/j.aml.2025.109831
Yadong Zhong, Jingjing Ge, Yi Zhang
Through a direct semi-discretization procedure, we construct a discrete version of the Kuralay-II equation. By employing the Darboux transformation method, we derive multi-soliton solutions for the resulting discrete system. Finally, we also investigate the positon solution of the discrete equation and perform a comprehensive graphical analysis to illustrate its dynamic behavior.
通过直接半离散化过程,我们构造了离散版的Kuralay-II方程。利用达布变换方法,我们得到了离散系统的多孤子解。最后,我们还研究了离散方程的位置解,并进行了全面的图形分析来说明其动态行为。
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引用次数: 0
Global dynamics of a dengue model with multiple delays incorporating vaccine waning and asymptomatic infection 包含疫苗减弱和无症状感染的多重延迟登革热模型的全球动力学
IF 2.8 2区 数学 Q1 MATHEMATICS, APPLIED Pub Date : 2025-11-24 DOI: 10.1016/j.aml.2025.109830
Songbai Guo, Xindi Wang, Qianqian Pan, Jing-An Cui
This paper presents a three-delay dengue model that includes waning vaccine immunity and asymptomatic infections. The model assumes that aware susceptible individuals avoid infection. We first derive the control reproduction number Rc and establish the model’s well-posedness and dissipativity. Next, we prove the existence and uniqueness of the endemic equilibrium and analyze its global stability in terms of Rc. Specifically, the disease-free equilibrium E0 is globally stable in C+ when Rc1. Conversely, the endemic equilibrium E is globally stable in M when Rc>1.
本文提出了一个三延迟登革热模型,包括减弱疫苗免疫和无症状感染。该模型假设有意识的易感个体会避免感染。首先推导了控制再现数Rc,建立了模型的适定性和耗散性。其次,我们证明了地方性平衡的存在性和唯一性,并从Rc的角度分析了其全局稳定性。具体来说,当Rc≤1时,C+中的无病平衡E0全局稳定。相反,当Rc>;1时,M的地方性平衡E *是全局稳定的。
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引用次数: 0
Algebraic method for Eigenvalue problems of dual quaternion Hermitian matrices and its application in RGB-HSV-based face representation and recognition 对偶四元数厄密矩阵特征值问题的代数方法及其在基于rgb - hsv的人脸表示与识别中的应用
IF 2.8 2区 数学 Q1 MATHEMATICS, APPLIED Pub Date : 2025-11-24 DOI: 10.1016/j.aml.2025.109829
Wenxv Ding
In recent years, dual quaternion matrix decompositions have become indispensable in applications such as formation control and color image processing. We propose a novel method for computing the eigenvalues and associated eigenvectors of a dual quaternion Hermitian matrix, leveraging its specific properties and structure in this paper. Numerical experiments demonstrate that the proposed algorithm achieves significant speedups compared to existing methods. Furthermore, a two-dimensional principal component analysis method modeled on dual quaternion matrices (2D-DQPCA) is successfully established, enabling the integration of the Hue-Saturation-Value (HSV) color model with the RGB model for application in face recognition.
近年来,对偶四元数矩阵分解在地层控制和彩色图像处理等应用中已成为不可缺少的方法。本文利用对偶四元数厄米矩阵的特殊性质和结构,提出了一种计算其特征值和相关特征向量的新方法。数值实验表明,与现有算法相比,该算法具有显著的提速效果。此外,成功建立了基于对偶四元数矩阵的二维主成分分析方法(2D-DQPCA),实现了色调-饱和度-值(HSV)颜色模型与RGB模型的融合,应用于人脸识别。
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引用次数: 0
Non-autonomous soliton, wave propagation and collision dynamic for (2+1)-dimensional higher-order nonlinear Schrödinger equation with variable coefficients (2+1)维高阶变系数Schrödinger方程的非自治孤子、波传播和碰撞动力学
IF 2.8 2区 数学 Q1 MATHEMATICS, APPLIED Pub Date : 2025-11-21 DOI: 10.1016/j.aml.2025.109827
Jingwen Yu, Fajun Yu
We extend the (1+1)-dimensional nonlinear Schrödinger(NLS) equation to (2+1)-dimensional variable coefficient higher-order equation and study the (2+1)-dimensional variable coefficient higher-order NLS equation by using the Hirota bilinear method. Some non-autonomous soliton solutions and soliton interactions are derived. In particular, we consider soliton collision behavior and control wave propagation methods. By choosing some different free functions, we obtain bright soliton, periodic soliton, double solitons with opposite opening directions, double solitons with the same opening direction, bi-“S-typed” soliton and bi-“π-typed” soliton. We consider some novel soliton collision phenomena and discover elastic collisions between two solitons. These results provide powerful methods for controlling the propagation of solitons. These results can aid in the analysis of new phenomena in optics.
将(1+1)维非线性Schrödinger(NLS)方程推广为(2+1)维变系数高阶方程,并利用Hirota双线性方法研究了(2+1)维变系数高阶NLS方程。导出了一些非自治孤子解和孤子相互作用。特别地,我们考虑了孤子的碰撞行为和控制波的传播方法。通过选择不同的自由函数,我们得到了亮孤子、周期孤子、开口方向相反的双孤子、开口方向相同的双孤子、双“s型”孤子和双“π型”孤子。我们考虑了一些新的孤子碰撞现象,发现了两个孤子之间的弹性碰撞。这些结果为控制孤子的传播提供了有力的方法。这些结果有助于分析光学中的新现象。
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引用次数: 0
Global stability for an advection–diffusion SI epidemic model with spatial heterogeneity in the critical case 临界情况下具有空间异质性的平流扩散SI流行病模型的全局稳定性
IF 2.8 2区 数学 Q1 MATHEMATICS, APPLIED Pub Date : 2025-11-20 DOI: 10.1016/j.aml.2025.109828
Jianpeng Wang , Kai Wang , Lei Wang , Zhidong Teng
In this paper, we are concerned with the global stability of disease-free steady state for a reaction–advection–diffusion SI epidemic model with heterogeneous diffusion and different advection when basic reproduction number R0=1. Furthermore, we also establish the criteria for the global stability of exponential positive steady state.
本文研究了具有非均匀扩散和不同平流的反应-平流-扩散SI流行病模型在基本繁殖数R0=1时无病稳态的全局稳定性问题。此外,我们还建立了指数正稳态全局稳定的判据。
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引用次数: 0
On the uniqueness of weak solutions to the 3d Navier–Stokes equations in Vishik-type spaces vishik型空间中三维Navier-Stokes方程弱解的唯一性
IF 2.8 2区 数学 Q1 MATHEMATICS, APPLIED Pub Date : 2025-11-19 DOI: 10.1016/j.aml.2025.109826
Fan Wu
We revisit the classical problem of uniqueness of Leray–Hopf weak solutions to the three-dimensional incompressible Navier–Stokes equations. In the pioneering works, uniqueness was established under Prodi–Serrin type conditions, and later improved to critical Besov spaces [Chen–Miao–Zhang, Ann. Inst. H. Poincaré Anal. Non Linéaire 26(2009) 2165-2180]. A key step in Chen–Miao–Zhang’s result is the decomposition of the velocity field into a Lipschitz low-frequency part and a higher integrability high-frequency part. In this paper, we refine this approach by replacing the Lipschitz control with a sharper bound in the nonhomogeneous Besov space B,11, using the framework of nonhomogeneous Vishik-type spaces. We establish an improved uniqueness criterion in Vishik-type spaces Vp,q,θr, which strictly extends the scope of classical Besov spaces used in prior works.
我们重新研究了三维不可压缩Navier-Stokes方程的Leray-Hopf弱解的唯一性问题。在开创性的著作中,在Prodi-Serrin型条件下建立了唯一性,后来又改进到临界Besov空间[陈淼张,Ann]。H.庞卡罗埃尔研究所。林氏学报26(2009)2165-2180。陈淼张结果的关键一步是将速度场分解为Lipschitz低频部分和高可积性的高频部分。在本文中,我们利用非齐次vishik型空间的框架,在非齐次Besov空间B∞,11中将Lipschitz控制替换为更锐利的界,从而改进了该方法。我们在vishik型空间Vp,q,θr中建立了一个改进的唯一性判据,严格地扩展了前人所使用的经典Besov空间的范围。
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引用次数: 0
期刊
Applied Mathematics Letters
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