in an electrically anisotropic media, current density  is not aligned with the electric field  and varies with the e-field direction. this can be considered as the spatial aliasing effects aroused by the subsurface structures whose individual dimensions are smaller than the inductive length scale of diffusively propagating em fields. the role of these structures is particularly significant in t...

The insulating state of matter is characterized by the excitation spectrum, but also by qualitative features of the electronic ground state. The insulating ground wavefunction in fact: (i) sustains macroscopic polarization, and (ii) is localized. We describe both properties using essentially the same formalism, based on Berry phases and related quantities, and specializing to the case of a crys...

The energetic thresholds for ion-pair photodissociation of diatomic oxygen fO2 1 hn ! O 1 OsP3y2, P1y2dg were measured using a novel technique. The technique depends on the production and selective detection of highly vibrationally excited ion-pair states which last for at least 5 ms following single photon excitation from the ground electronic state of O2. These ion-pair states are analogous t...

This paper assesses the dynamic nonlinear free-field soil response under bidirectional horizontal non-uniform excitation through a series of multi-point 1 g shaking table tests. The bed was enclosed in an innovative box supported by array three shake tables and subjected to uniform ground motions one two directions. unidirectional excitations, both non-uniform, were compared discussed terms acc...