The fuel layer density of an imploding laser-driven spherical shell is inferred from framed x-ray radiographs. The density distribution is determined by using Abel inversion to compute the radial distribution of the opacity kappa from the observed optical depth tau. With the additional assumption of the mass of the remaining fuel, the absolute density distribution is determined. This is demonst...

We use the recent model for the distribution of interstellar gas in the Galactic bulge developed by Ferrière et al. (2007) [1] together with the Galprop numerical code to compute the Galactic diffuse gamma-ray emission due to cosmic rays. We then compare our computed Galactic diffuse gamma-ray sky with the previous results obtained with Galprop. Based on the differences between the models of ga...

We use a Monte Carlo ray-tracing model to compute the thermal-infrared emissivity of a wind-roughened sea surface. The model includes the effects of both shadowing and the reflected component of surface emission. By using Stokes vectors to quantify the radiation along a given ray path, we compute the effects of polarization as well. We separate the direct emission from surface reflections to sh...

Most existing methods for registration of three-dimensional tomographic images to two-dimensional projection images use simulated projection images and either intensity-based or feature-based image similarity measures. This paper suggests a novel class of similarity measures based on probabilities. We compute intensity distributions along simulated rays through the 3-D image rather than ray sum...

Isosurface extraction using " dual contouring " approaches have been developed to generate a surface that is " dual " in terms of the underlying extraction procedure used when compared to the standard Marching Cubes (MC) method. These approaches address some shortcomings of the MC methods including feature-detection within a cell and better triangles. One approach for preserving " sharp feature...

We present an algorithm for interactive computation of diffraction paths for geometric-acoustics in complex environments. Our method extends ray-frustum tracing [Lauterbach et al. 2007] to efficiently compute volumetric regions of the sound field caused by long diffracting edges. We compute accurate diffraction paths from each source to the listener and based on the Uniform Theory of Diffractio...