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We study a two-dimensional model for micromagnetics, which consists in an energy functional over -valued vector fields. Bounded-energy configurations tend to be planar, except in small regions which can be described as vortices (Bloch lines in physics). As the characteristic “exchange-length” tends to 0, they converge to planar divergence-free unit norm vector fields which jump along line singularities. We derive lower bounds for the energy, which are explicit functions of the jumps of the limit....
We study a two-dimensional model for micromagnetics, which consists in an energy functional over S2-valued vector fields. Bounded-energy configurations tend to be planar, except in small regions which can be described as vortices (Bloch lines in physics). As the characteristic “exchange-length” tends to 0, they converge to planar divergence-free unit norm vector fields which jump along line singularities. We derive lower bounds for the energy, which are explicit functions of the jumps of the limit....
The paper deals with boundary value problems for systems of nonlinear elliptic equations in a relatively general form. Theorems based on monotone operator theory and concerning the existence of weak solutions of such a system, as well as the convergence of discretized problem solutions are presented. As an example, the approach is applied to the stationary Van Roosbroeck’s system, arising in semiconductor device modelling. A convergent algorithm suitable for solving sets of algebraic equations generated...
We consider the numerical solution, in two- and three-dimensional bounded domains, of the inverse problem for identifying the location of small-volume, conductivity imperfections in a medium with homogeneous background. A dynamic approach, based on the wave equation, permits us to treat the important case of “limited-view” data. Our numerical algorithm is based on the coupling of a finite element solution of the wave equation, an exact controllability method and finally a Fourier inversion for localizing...
We consider the numerical solution, in two- and three-dimensional
bounded domains, of the inverse problem for identifying the location
of small-volume, conductivity imperfections in a medium with homogeneous
background. A dynamic approach, based on the wave equation, permits
us to treat the important case of “limited-view” data. Our numerical
algorithm is based on the coupling of a finite element solution of
the wave equation, an exact controllability method and finally a Fourier
inversion for...
The topic of this paper is the numerical analysis of time periodic solution for electro-magnetic phenomena. The Limit Absorption Method (LAM) which forms the basis of our study is presented. Theoretical results have been proved in the linear finite dimensional case. This method is applied to scattering problems and transport of charged particles.
The topic of this paper is the numerical analysis of time
periodic solution for electro-magnetic phenomena.
The Limit Absorption Method (LAM)
which forms the basis of our study is presented. Theoretical
results have been proved in the linear finite dimensional case. This
method is applied to scattering problems and transport of charged
particles.
In this article we implement different numerical schemes to simulate the Schrödinger-Debye equations that occur in nonlinear optics. Since the existence of blow-up solutions is an open problem, we try to compute such solutions. The convergence of the methods is proved and simulations seem indeed to show that for at least small delays self-focusing solutions may exist.
In this article we implement different numerical schemes to simulate the
Schrödinger-Debye equations that occur in nonlinear optics. Since the
existence of blow-up solutions is an open problem, we try to compute such
solutions. The convergence of the methods is proved and simulations seem
indeed to show that for at least small delays self-focusing solutions may
exist.
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