33 research outputs found
Influence of insonification angle on echogenicity of B-mode images of atherosclerotic plaque in vitro
Critical component of the interplanetary magnetic field responsible for large geomagnetic effects in the polar cap
An observed influence is studied of the interplanetary magnetic sector structure on the geomagnetic variations in the polar cap which appears to be due to the component of the interplanetary magnetic field near the ecliptic perpendicular to the earth-sun direction. It is suggested that the observed effect on the ground originates in the front of the magnetosphere
Overview of Solar Wind–Magnetosphere–Ionosphere–Atmosphere Coupling and the Generation of Magnetospheric Currents
Quantitative pupil analysis in stimulated emission depletion microscopy using phase retrieval
Echolucent, rupture-prone carotid plaques associated with elevated triglyceride-rich lipoproteins, particularly in women
Quantitative pupil analysis in stimulated emission depletion microscopy using phase retrieval
The resolution attainable with stimulated emission depletion (STED) microscopy greatly depends on the quality of the STED laser focus. So far, visual inspection of a measured STED focus has been the only convenient means of gauging the source of aberrations. Here we describe a method, requiring no instrument modifications, for obtaining an equivalent to the complex pupil function at the back aperture of the objective and show that it provides quantitative information about aberration sources (including aberrations induced by the objective or sample). We show the accuracy of this field representation to be sufficient for reconstructing the STED focus in three dimensions and determining corrective steps