Zobrazeno 1 - 10
of 1 663
pro vyhledávání: '"Lamacz, A."'
Autor:
Lamacz-Keymling, Agnes
Publikováno v:
Mitteilungen der DMV; Jun2024, Vol. 32 Issue 2, p90-93, 4p
Autor:
Lamacz-Keymling, Agnes, Yousept, Irwin
This article examines a linear-quadratic elliptic optimal control problem in which the cost functional and the state equation involve a highly oscillatory periodic coefficient $A^\varepsilon$. The small parameter $\varepsilon>0$ denotes the periodici
Externí odkaz:
http://arxiv.org/abs/2010.04469
We analyze the Helmholtz equation in a complex domain. A sound absorbing structure at a part of the boundary is modelled by a periodic geometry with periodicity $\varepsilon>0$. A resonator volume of thickness $\varepsilon$ is connected with thin cha
Externí odkaz:
http://arxiv.org/abs/2006.02701
This article examines the accuracy for large times of asymptotic expansions from periodic homogenization of wave equations. As usual, $\epsilon$ denotes the small period of the coefficients in the wave equation. We first prove that the standard two s
Externí odkaz:
http://arxiv.org/abs/1803.09455
Autor:
Lamacz, Agnes, Schweizer, Ben
Solutions to the wave equation with constant coefficients in $\mathbb{R}^d$ can be represented explicitly in Fourier space. We investigate a reconstruction formula, which provides an approximation of solutions $u(.,t)$ to initial data $u_0(.)$ for la
Externí odkaz:
http://arxiv.org/abs/1905.07294
Autor:
Allaire, Grégoire1 (AUTHOR) gregoire.allaire@polytechnique.fr, Lamacz-Keymling, Agnes2 (AUTHOR) agnes.lamacz@uni-due.de, Rauch, Jeffrey3 (AUTHOR) rauch@umich.edu
Publikováno v:
Asymptotic Analysis. 2022, Vol. 128 Issue 3, p295-336. 42p.
Publikováno v:
Nonlinearity 31 4517 (2018)
In molecular dynamics and sampling of high dimensional Gibbs measures coarse-graining is an important technique to reduce the dimensionality of the problem. We will study and quantify the coarse-graining error between the coarse-grained dynamics and
Externí odkaz:
http://arxiv.org/abs/1712.09920
Autor:
Lamacz, Agnes, Schweizer, Ben
We investigate the acoustic properties of meta-materials that are inspired by sound-absorbing structures. We show that it is possible to construct meta-materials with frequency-dependent effective properties, with large and/or negative permittivities
Externí odkaz:
http://arxiv.org/abs/1603.05395
Autor:
Lamacz, Agnes, Schweizer, Ben
We derive the homogenization limit for time harmonic Maxwell's equations in a periodic geometry with periodicity length $\eta>0$. The considered meta-material has a singular sub-structure: the permittivity coefficient in the inclusions scales like $\
Externí odkaz:
http://arxiv.org/abs/1509.00708
Autor:
Lamacz, Agnes, Schweizer, Ben
We analyze the propagation of waves in unbounded photonic crystals, the waves are described by a Helmholtz equation with $x$-dependent coefficients. The scattering problem must be completed with a radiation condition at infinity, which was not availa
Externí odkaz:
http://arxiv.org/abs/1509.00683