The wave equation with oscillating density:  observability at low frequency

Gilles Lebeau

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The wave equation with oscillating density : observability at low frequency

Gilles Lebeau (1998-1999)

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Regularization and finite element approximation of the wave equation with Dirichlet boundary data

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Mathematical problems in geophysical wave propagation.

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Waves of excitations in heterogeneous annular region II. Strong asymmetry

Kristóf Kály-Kullai, András Volford, Henrik Farkas (2003)

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Excitation wave propagation in a heterogeneous medium around a circular obstacle is investigated, when the obstacle is located very eccentrically with respect to the interfacial circle separating the slow inner and the fast outer region. Qualitative properties of the permanent wave fronts are described, and the calculated wave forms are presented.