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In this article, we investigate the determination of the spatial component in the time-dependent second order coefficient of a hyperbolic equation from both theoretical and numerical aspects. By the Carleman estimates for general hyperbolic…

偏微分方程分析 · 数学 2019-04-12 Jie Yu , Yikan Liu , Masahiro Yamamoto

We consider the Stokes resolvent problem in a two-dimensional bounded Lipschitz domain $\Omega$ subject to homogeneous Dirichlet boundary conditions. We prove $\mathrm{L}^p$-resolvent estimates for $p$ satisfying the condition $\lvert 1 / p…

偏微分方程分析 · 数学 2022-09-15 Fabian Gabel , Patrick Tolksdorf

This paper is mainly concerned with the inverse scattering problem of determining the unknown potential for the classical Schr\"odinger equation in two and three dimensions. We establish the increasing stability of the inverse scattering…

偏微分方程分析 · 数学 2023-06-21 Jian Zhai , Yue Zhao

In this short paper we prove a global logarithmic stability of the Cauchy problem for H 2-solutions of an anisotropic elliptic equation in a Lip-schitz domain. The result we obtained is based on tools borrowed from the existing technics to…

偏微分方程分析 · 数学 2019-03-05 Mourad Choulli

We consider the inverse boundary value problem of determining the potential $q$ in the equation $\Delta u + qu = 0$ in $\Omega\subset\mathbb{R}^n$, from local Cauchy data. A result of global Lipschitz stability is obtained in dimension…

偏微分方程分析 · 数学 2017-02-15 Giovanni Alessandrini , Maarten V. de Hoop , Romina Gaburro , Eva Sincich

In this work we study the inverse boundary value problem of determining the refractive index in the acoustic equation. It is known that this inverse problem is ill-posed. Nonetheless, we show that the ill-posedness decreases when we…

偏微分方程分析 · 数学 2011-10-25 Sei Nagayasu , Gunther Uhlmann , Jenn-Nan Wang

We consider the stability in the inverse problem consisting of the determination of a time-dependent coefficient of order zero $q$, appearing in a Dirichlet initial-boundary value problem for a wave equation $\partial_t^2u-\Delta…

偏微分方程分析 · 数学 2016-02-01 Yavar Kian

We prove that the displacement problem of inhomogeneous elastostatics in a two--dimensional exterior Lipschitz domain has a unique solution with finite Dirichlet integral $\u$, vanishing uniformly at infinity if and only if the boundary…

偏微分方程分析 · 数学 2018-05-04 Adele Ferone , Remigio Russo , Alfonsina Tartaglione

We study the impedance boundary map (or Robin-to-Robin map) for the Schrodinger equation in open bounded demain at fixed energy in multidimensions. We give global stability estimates for determining potential from these boundary data and,…

偏微分方程分析 · 数学 2013-06-27 Mikhail Isaev , Roman Novikov

A Coefficient Inverse Problem for the radiative transport equation is considered. The globally convergent numerical method, the so-called convexification, is developed. For the first time, the viscosity solution is considered for a boundary…

数值分析 · 数学 2023-03-17 Michael V. Klibanov , Jingzhi Li , Zhipeng Yang

In this paper, we investigate the inverse problem on determining the spatial component of the source term in a hyperbolic equation with time-dependent principal part. Based on a newly established Carleman estimate for general hyperbolic…

偏微分方程分析 · 数学 2019-04-12 Daijun Jiang , Yikan Liu , Masahiro Yamamoto

This paper is concerned with the inverse problem on determining an orbit of the moving source in a fractional diffusion(-wave) equations in a connected bounded domain of $\mathbb R^d$ or in the whole space $\mathbb R^d$. Based on a newly…

偏微分方程分析 · 数学 2020-02-06 Guanghui Hu , Yikan Liu , Masahiro Yamamoto

We analyze strict positivity at the boundary for nonnegative solutions of Robin problems in general (non-smooth) domains, e.g. open sets with rectifiable topological boundaries having finite Hausdorff measure. This question was raised by…

偏微分方程分析 · 数学 2022-06-22 Dorin Bucur , Alessandro Giacomini , Mickaël Nahon

We consider the inverse problem for the general transport equation with external field, source term and absorption coefficient. We show that the source and the absorption coefficients can be uniquely reconstructed from the boundary…

偏微分方程分析 · 数学 2019-04-24 Ru-Yu Lai , Qin Li

We examine the stability issue in the inverse problem of determining a scalar potential appearing in the stationary Schr{\"o}dinger equation in a bounded domain, from a partial elliptic Dirichlet-to-Neumann map. Namely, the Dirichlet data…

偏微分方程分析 · 数学 2015-01-09 Mourad Choulli , Yavar Kian , Eric Soccorsi

In this article, we prove a stability estimate going from the Radon transform of a function with limited angle-distance data to the $L^p$ norm of the function itself, under some conditions on the support of the function. We apply this…

偏微分方程分析 · 数学 2012-12-17 Pedro Caro , David Dos Santos Ferreira , Alberto Ruiz

We consider a parabolic equation in a bounded domain $\OOO$ over a time interval $(0,T)$ with the homogeneous Neumann boundary condition. We arbitrarily choose a subboundary $\Gamma \subset \ppp\OOO$. Then, we discuss an inverse problem of…

偏微分方程分析 · 数学 2022-11-23 O. Imanuvilov , M. Yamamoto

We prove the solvability in Sobolev spaces of the conormal derivative problem for the stationary Stokes system with irregular coefficients on bounded Reifenberg flat domains. The coefficients are assumed to be merely measurable in one…

偏微分方程分析 · 数学 2017-08-21 Jongkeun Choi , Hongjie Dong , Doyoon Kim

This article considers a Cauchy problem of Helmholtz equations whose solution is well known to be exponentially unstable with respect to the inputs. In the framework of variational quasi-reversibility method, a Fourier truncation is applied…

数值分析 · 数学 2022-08-31 Vo Anh Khoa , Nguyen Dat Thuc , Ajith Gunaratne

This paper is concerned with the stability estimates for inverse source problems of the stochastic Helmholtz equation driven by white noise. The well-posedness is established for the direct source problems, which ensures the existence and…

偏微分方程分析 · 数学 2023-07-14 Peijun Li , Ying Liang