Evidence for a long range structure in the pion emission source in Au+Au collisions at RHIC

The PHENIX experiment, has recently acquired $\sim$ 1 billion minimum bias Au+Au events at $\sqrt s = 200$GeV during the year-2004 run. This high statistics data set, coupled with a state-of-the-art analysis technique, allows for the extraction of 3D emission sources for various particle types. These 3D sources lend fresh insight into the nature of a long-range source previously reported by PHENIX. The new results indicate an anisotropic pion emission source in the pair c.m. having an extended space-time extent oriented in the outward direction. The two-proton emission source from the same data set is essentially isotropic the pair c.m. frame. These results provide a "window" for viewing the evolution dynamics of the high energy density nuclear matter created at RHIC.Comment: Proceedings for parallel talk at Quark Matter 200

Evidence for non-Gaussian tail in 3D pion emission source at the SPS

The NA49 experiment at CERN SPS has acquired a huge data set of Pb+Pb events over a broad range of energy and centrality during the last several years. This high statistics data set, coupled with a state-of-the-art analysis technique, allows for the first model-independent extraction and energy scan of 3D emission sources for pion pairs at SPS energies. These 3D pion emission sources provide new insights into the nature of a long-range source previously reported by PHENIX at RHIC. The new results indicate that the pion source displays significant non-Gaussian tails in the longitudinal direction at 40 and 158 AGeV and in the outward direction at 158 AGeV.Comment: Proceedings, QM06, Beijing, Chin

Diffusivity in turbulent fluid containing two dominant scales, and compressible shear layer according to a kinetic theory

The solution of the two nonequilibrium-degree kinetic equation was first determined for the effective length scale and turbulence energy for a spatially homogeneous turbulence field with two characteristic length scales, where the source for one family of eddies exists. This solution was applied to the evaluation of the eddy diffusivity in the combustion chamber of an internal combustion engine. The result was compared with another existing solution. This was carried out to demonstrate the feasibility of obtaining an effective length-scale equation within the context of the kinetic theory. A formulation and partial solution of the compressible plane shear layer are also presented

A turbulence description of couette flow

Statistical mechanics for wall shear turbulence in couette flow based on Brownian motion and comparison with stochastic theory based on Navier-Stokes equatio

Chemical reaction in a turbulent flow field with uniform velocity gradient

Chemical reactions in turbulent flow fields with uniform velocity gradien