Based on velocity data from a long-term moored observatory located at 0°N, 23°W we present evidence of vertical asymmetry during the intraseasonal maxima northward and southward upper-ocean flow in equatorial Atlantic Ocean. Periods are characterized by meridional maximum close to surface, while phases show subsurface about 40 m. We that observed is caused local winds. Southerly wind stress equ...

a solution technique for the dynamic analysis of asymmetric base-isolated buildings, subject to earthquake ground motion, is presented. to develop the formulation, a yield surface as a function of both shear force and torsion moment of the sliding surface with rigid perfectly plastic behavior is constituted. to achieve the objective, the yield stress is defined by the friction coefficient throu...

Low-level wind shear, especially a microburst, is very hazardous to aircraft departing or approaching an airport. The danger became especially clear in a series of fatal commercial airliner accidents in the 1970s and 1980s at U.S. airports. In response, the Federal Aviation Agency (FAA) developed and deployed three ground-based lowaltitude wind-shear detection systems: the Low Altitude Wind She...

Hemodynamic shear stress at the endothelial cell surface induces acute and chronic intracellular responses that regulate vessel wall biology. The cytoskeleton is implicated by acting both as a direct connector to local surface deformation and as a distribution network for mechanical forces throughout the cell; however, direct observation and measurement of its position during flow have only rec...

BACKGROUND We showed that mitochondrial coupling factor 6 (CF6), an endogenous inhibitor of prostacyclin synthesis, is present in the systemic circulation as a pressor substance in rats. We investigated the possibility of vascular endothelial cells as a source of circulating CF6. METHODS AND RESULTS We used 2 cultured endothelial cell lines, human umbilical vein endothelial cells (HUVECs) and...

In December 2005, operational wind shear alerting at the Hong Kong International Airport (HKIA) reached an important milestone with the launch of the automatic Lidar (light detection and ranging) Windshear Alerting System (LIWAS). This signifies that the anemometer-based and radar-based wind shear detection technologies deployed worldwide in the twentieth century have been further advanced by t...

[1] Wave-generated shear stresses are the main mechanism responsible for sediment erosion on tidal flats and regulate both sediment concentrations in the water column and, together with tidal currents, sediment export to salt marshes and to the ocean. We present herein a simple method to estimate sediment erosion potential in shallow tidal basins caused by wind wave events. The method determine...

The effects of breaking waves on near-surface wind turbulence and drag coefficient are investigated using large-eddy simulation. The impact of intermittent and transient wave breaking events (over a range of scales) is modeled as localized form drag, which generates airflow separation bubbles downstream. The simulations are performed for very young sea conditions under high winds, comparable to...