Speed Discrepancy Research Articles

The Use of Land and Sea Based Wind Data in a Simple Circulation Model

Abstract The use of land based wind data in nearshore oceanographic work is common, but these winds do not accurately reflect coastal oceanic winds. Ocean winds are often underestimated by a factor of 2 and directional differences are also observed. Wind time series from land and sea regimes in the South Atlantic Bight (SAB) were applied to a reduced form of the momentum equation to estimate the alongshore current. Currents were closely approximated by ocean wind stress, but were consistently underestimated by land data. Further statistical analyses verified this discrepancy in speed and also indicated significant differences between ocean and speed-adjusted land winds. The bottom frictional coefficient required to balance alongshore momentum was unrealistically small when land based wind data were used as input.

TRANSIENT GYROMAGNETIC BEHAVIOR OF BLOCH WALLS IN THIN MAGNETIC FILMS

The transient gyromagnetic behavior of the one-dimensional 180° Bloch walls in thin films is analyzed based on the Landau-Lifshitz equation for distributed systems. The physical model of gyromagnetic spin motion in the wall is found adequate in explaining wall streaming (or worm motion). The key mechanism is the induction of a large transverse magnetostatic field resulting from discrepancy in switching speeds in the wall and the adjoining regions. The dependence of wall displacement on pulse shapes and film parameters is examined.

Perceptual-motor speed discrepancy and deviant driving.

Perceptual-motor speed discrepancy and deviant driving.