Short water surface waves generated by wind in a water tunnel have been measured by an optical technique that provides a synoptic picture of the water surface gradient over an area of water surface (Zhang & Cox 1994). These images of the surface gradient can be integrated to recover the shape of the water surface and find the two-dimensional wavenumber spectrum. Waveforms and two-dimensional st...

The propagation of high-frequency gravitational waves can be analyzed using the geometrical optics approximation. In case large but finite frequencies, approximation is no longer accurate and polarization-dependent corrections at first order in wavelength modify waves, via a spin-orbit coupling mechanism. We present covariant derivation from principles effective ray equations describing polariz...

For laterally complex media, it may be more suitable to take a different orientation of thedisplacement vector of Shear-waves. This may change the sign of several imaginary reflections andconversion coefficients to be used in reservoir characterization and AVO (Amplitude Versus Offset)analysis or modeling. In this new convention the positive direction of the displacement vector ofreflected Shea...

A mutilated model is constructed to approximate the collision term of spin Boltzmann equation that incorporates newly appearing collisional invariants, i.e., total angular momentum. With recourse degenerate perturbation theory, dispersion relations hydrodynamic modes are formulated, among which responsible for equilibration. We find nonlocality does not change sound speed but slows down propaga...

It is well established now that the solar atmosphere, from photosphere to the corona and the solar wind is a highly structured medium. Satellite observations have confirmed the presence of steady flows. Here, we investigate the parallel propagation of magnetohydrodynamic (MHD) surface waves travelling along an ideal incompressible flowing plasma slab surrounded by flowing plasma environment in ...