The phase velocity of magnetic islands is calculated in the semicollisional regime with cold ions. Two solution branches arise, corresponding to islands propagating with the ions and with the electrons. For the ion branch the phase velocity and the polarization current are small. For the electron branch, the phase velocity depends on the ratio of W, the half-width of the island, and rho(s), the...

near-fault ground motions have caused very much damage in the vicinity of seismic sources during recent earthquakes. it is well known that under specific circumstances, intensive ground shakings near fault ruptures may be characterized by short-duration impulsive motions. this pulse-type motion is generally particular to the forward direction, where the fault rupture propagates towards the site...

Salmonids frequently adapt their feeding and movement strategies to cope with seasonally fluctuating stream environments. Oncorhynchus mykiss tend drift-forage in higher velocity habitat than other salmonids, yet presence streams low drift suggests behavioral flexibility. We combined 3D videogrammetry measurements of invertebrate hydraulics investigate the drivers O. foraging mode during season...

Given the low ionization fraction of molecular clouds, ambipolar diffusion is thought to be an integral process in star formation. However, chemical and radiative-transfer effects, observational challenges, fact that ion-neutral drift velocity inherently very small render a definite detection extremely non-trivial. Here, we study suite chemodynamical, non-ideal magnetohydrodynamic (MHD), two-di...