Direct evidence for continuous radar reflector originating from changes in crystal-orientation fabric

Direct evidence for continuous radar reflector originating from changes in crystal-orientation fabric

The origin of a strong continuous radar reflector observed with airborne radio-echo sounding (RES) at the EPICA deep-drilling site in Dronning Maud Land, Antarctica, is identified as a transition in crystal fabric orientation from a vertical girdle to an increased single-pole orientation seen along the ice core. The reflector is observed with a 60 ns and 600 ns long pulse at a frequency of 150 ...

Direct evidence for radar reflector originating from changes in crystal-orientation fabric

Strain history of ice shells of the Galilean satellites from radar detection of crystal orientation fabric

[1] Orbital radar sounding has been suggested as a means of determining the subsurface thermal and physical structure of the outer ice I shells of the Galilean satellites. At radar frequencies, the dielectric permittivity of single‐ and polycrystalline water ice I is anisotropic. Crystal orientation fabric (COF), which is indicative of strain history, can be unambiguously detected by comparing ...

Direct evidence for increased hydroxyl radicals originating from superoxide in the failing myocardium.

Experimental and clinical studies have suggested an increased production of reactive oxygen species (ROS) in the failing myocardium. The present study aimed to obtain direct evidence for increased ROS and to determine the contribution of superoxide anion (*O(2)(-)), H(2)O(2), and hydroxy radical (*OH) in failing myocardial tissue. Heart failure was produced in adult mongrel dogs by rapid ventri...

3–Dimensional Fabric Reconstruction from 2–Dimensional Orientation Images

3–dimensional (3d) automatic crystal orientation mapping (ACOM) allows to sample parallel 2d section raster images which represent the orientation of crystal grains. The fabric, i.e. the partition of the specimen into 3d crystal grains, can be approximated given its intersections with parallel planes provided by series of 2–dimensional raster orientation images. A method to model the 3d fabric ...