tag:blogger.com,1999:blog-154393652011-04-21T16:27:44.104-07:00physiclabhttp://www.blogger.com/profile/11124429011787713070noreply@blogger.comBlogger21100tag:blogger.com,1999:blog-15439365.post-1126880949532755182005-09-16T07:27:00.000-07:002005-09-16T07:29:09.540-07:00Only one quasar has been discovered at a greater distance. However, whereas quasars are super-massive black holes containing the mass of billions of stars, this burst comes from a single star. Scientists find it puzzling how a single star could generate enough energy to be seen across the universe. They speculate that this early star may be physically different from the kinds that exist today. Alternatively, the star may be focusing all the energy of the explosion into narrow 'jets' of particles and radiation, with one jet by chance pointed toward Earth.Whatever the explanation, the discovery is heralded as a major breakthrough in the study of the early universe. Few quasars are seen at exceedingly far distances, at the earliest epoch of star and galaxy formation, despite exhaustive searches. 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The time-stepping is implicit. The 3D mesh is composed of tetrahedra and has a variable resolution. It is based on an unstructured 2D surface mesh and is stratified in the vertical direction. The model uses linear functions for horizontal velocity and tracers on tetrahedra, and for surface elevation on surface triangles. The vertical velocity field is elementwise constant. An important ingredient of the model is the Galerkin least-squares stabilization used to minimize effects of unresolved boundary layers and make the matrices to be inverted in time-stepping better conditioned. The model performance was tested in a 16-year simulation of the North Atlantic using a mesh covering the area between 7° and 80° N and providing variable horizontal resolution from 0.3° to 1.5°.<div class="blogger-post-footer"><img width='1' height='1' src='https://blogger.googleusercontent.com/tracker/15439365-112410196093179235?l=physiclab.blogspot.com' alt='' /></div>physiclabhttp://www.blogger.com/profile/11124429011787713070noreply@blogger.com0