In a planar infinite strip with a fast oscillating boundary we consider an
elliptic operator assuming that both the period and the amplitude of the
oscillations are small. On the oscillating boundary we impose Dirichlet,
Neumann or Robin boundary condition. In all cases we describe the homogenized
operator, establish the uniform resolvent convergence of the perturbed
resolvent to the homogenized one, and prove the estimates for the rate of
convergence. These results are obtained as the order of the amplitude of the
oscillations is less, equal or greater than that of the period. It is shown
that under the homogenization the type of the boundary condition can change
In this paper we study the asymptotic behaviour of the
wave equation with
rapidly oscillating coefficients in a two-component composite with
ε-periodic imperfect inclusions.
We prescribe on the interface between the two components a jump of
the solution proportional to the conormal derivatives through a
function of order ε^γ. For the different values of
γ, we obtain different limit problems. In particular, for
γ=1 we have a linear memory effect in the homogenized
problem
This paper concerns an equilibrium problem for a two-dimensional elastic body with a thin Timoshenko elastic inclusion and a thin rigid inclusion. It is assumed that the inclusions have a joint point and we analyze a junction problem for these inclusions. The existence of solutions is proved and the different equivalent formulations of the problem are discussed. In particular, the junction conditions at the joint point are found. A delamination of the elastic inclusion is also assumed. In this case, the inequality-type boundary conditions are imposed at the crack faces to prevent a mutual penetration between the crack faces. We investigate the convergence to infinity and zero of a rigidity parameter of the elastic inclusion. It is proved that in the limit, we obtain a rigid inclusion and a zero rigidity inclusion (a crack).
We treat an inverse electrical conductivity problem which deals with the reconstruction of nonlinear electrical conductivity starting from boundary measurements in steady currents operations. In this framework, a key role is played by the Monotonicity Principle, which establishes a monotonic relation connecting the unknown material property to the (measured) Dirichlet-to-Neumann operator (DtN). Monotonicity Principles are the foundation for a class of non-iterative and real-time imaging methods and algorithms. In this article, we prove that the monotonicity principle for the Dirichlet Energy in nonlinear problems holds under mild assumptions. Then, we show that apart from linear and p-Laplacian cases, it is impossible to transfer this monotonicity result from the Dirichlet Energy to the DtN operator. To overcome this issue, we introduce a new boundary operator, identified as an average DtN operator.
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