arXiv subjects

Tiziana Durante

Publications and source records attributed to Tiziana Durante.

3 recordsLinked to original sources

arXiv2025

A homogenization bending shell theory for multiscale materials from $3D$ nonlinear elasticity

We derive homogenized bending shell theories starting from three dimensional nonlinear elasticity. The original three dimensional model contains three small parameters: the two homogenization scales $\varepsilon$ and $\varepsilon^2$ of the material properties and the thickness $h$ of the shell. Depending on the asymptotic ratio of these three parameters, we obtain different asymptotic theories.

math.AP↗

arXiv2017

The spectrum, radiation conditions and the Fredholm property for the Dirichlet Laplacian in a perforated plane with semi-infinite inclusions

We consider the spectral Dirichlet problem for the Laplace operator in the plane $Ω^{\circ}$ with double-periodic perforation but also in the domain $Ω^{\bullet}$ with a semi-infinite foreign inclusion so that the Floquet-Bloch technique and the Gelfand transform do not apply directly. We describe waves which are localized near the inclusion and propagate along it. We give a formulation of the problem with radiation conditions that provides a Fredholm operator of index zero. The main conclusion concerns the spectra $σ^{\circ}$ and $σ^{\bullet}$ of the problems in $Ω^{\circ}$ and $Ω^{\bullet},$ namely we present a concrete geometry which supports the relation $σ^{\circ}\varsubsetneqqσ^{\bullet}$ due to a new non-empty spectral band caused by the semi-infinite inclusion called an open waveguide in the double-periodic medium.

math.SP↗

arXiv2015

Homogenization and norm resolvent convergence for elliptic operators in a strip perforated along a curve

We consider an infinite planar straight strip perforated by small holes along a curve. In such domain, we consider a general second order elliptic operator subject to classical boundary conditions on the holes. Assuming that the perforation is non-periodic and satisfies rather weak assumptions, we describe all possible homogenized problems. Our main result is the norm resolvent convergence of the perturbed operator to a homogenized one in various operator norms and the estimates for the rate of convergence. On the basis of the norm resolvent convergence, we prove the convergence of the spectrum.

math.AP↗