The development of a three-dimensional spatially evolving compressible mixing layer is investigated numerically using a parallel implementation of Adaptive Mesh Refinement (AMR) on a Cray C-90. The parallel implementation allowed the flow to be highly resolved while significantly reducing the wall-clock runtime. A sustained computation rate of 5.3 Gigaflops including I/O was obtained for a typical production run on a 16 processor machine. A novel mixing layer configuration is investigated where a pressure mismatch is maintained between the two inlet streams. In addition, the sonic character of the two streams is sufficiently different so that the pressure relief wave is trapped in the high speed stream. The trapped wave forces the mixing layer to form a characteristic cellular pattern. The cellular structure introduces curvature into the mixing layer that excites centrifugal instabilities characterized by large-scale counter-rotating vortical pairs embedded within the mixing layer. These are the dominant feature of the flow. Visualizations of these structures in cross-section show the pumping action which lifts dense fluid up into light gas. This effect has a strong impact on mixing enhancement as monitored by a conserved scalar formulation. Once the large-scale structures axe well established in the flow and undergo intensification from favorable …

Progress in developing novel, rigid, monolithic adsorbent carbon fiber composites is described. Carbon fiber composites are activated using steam or CO{sub 2}, in order to produce uniform activation through the material and to control the pore structure and adsorptive properties. There is an overall shrinkage during activation, which is directly correlated with burnoff; burnoff above 40% results in fracture. Burnoffs higher than 10% does not produce any benefit for separation of CH{sub 4}-CO{sub 2} mixtures. Five samples of CFCMS have been prepared for testing as molecular sieves; all have relatively narrow pore size distributions with average pore diameters around 6A.

Newsletter of the Texas Bureau of Disease Control and Epidemiology discussing the news, activities, and events of the organization and other information related to health in Texas.

This report discusses in general terms the basic process and time line for banking industry acquisitions and mergers and briefly discusses the May 4, 1998 application by Travelers Group to merge with Citicorp. Among the issues discussed are: potential impact on consumers; whether the new entities would be too big to fail; and, whether competitive equity calls for financial modernization legislation with functional regulation of the securities, banking, and insurance sectors of companies offering customers a full range of financial products and services. Legislative developments on financial modernization issues in the 105th Congress are reported in CRS Issue Brief 97034, which is available on the Legislative Information System.

CRS Report for Congress entailing information about Congressional intent regarding the Individuals with Disabilities Education Act (IDEA) . Topics include, benefits of the act, public awareness, funding complications etc..

This report is intended to provide a brief overview of the various potential restrictions, rules or regulations upon lobbying activities of non-profit organizations.

Newsletter focusing on pecan disease and pest control in Texas, including prevention, identification, treatment, and educational opportunities.