In support of the closure of Tank 16H, a sample of the solids residue on the bottom of the tank interior and three samples from the tank annulus will be sent to SRTC for analysis. The results of the analysis of the samples from the tank interior and the annulus will define the source term inventory used for fate and transport modeling. In addition, the samples from the tank annulus will be used for dissolution tests to evaluate the effectiveness of various cleaning alternatives.

This project developed an analytical technique for measuring the isotope abundance for 14C and 13C in total organic carbon (TOC) in order to test whether these measurements can trace TOC interaction with sedimentary material at the bottom of rivers and lakes, soils, and subsurface aquifer rocks.

From October 1994 to June 1997, a multidisciplinary team of scientists and engineers at Lawrence Livermore National Laboratory were funded through LDRD to develop and integrate technologies for diagnosis and treatment of acute stroke. The project was summarized in a Science and Technology Review article `Brain Attack` that appeared in June 1997 and again in the Center for Healthcare Technologies Report (UCRL-LR-124761). This article is the best overview of the project, epidemiology of stroke and technical progress. Most of the technical progress has been documented in conference papers and presentations and refereed journal articles. Additional technical publication can be expected as our remaining patent applications progress through the US Patent and Trademark Office. The purpose of this report is to provide an appropriate introduction and organization to the numerous publications so that interested readers can quickly find information. Because there is no documentation for the history of this project, this report provides a summary. It also provides the final status report for the LDRD funding.

In the US, impure Pu-containing materials such as residues and scrapes are in storage, in known quantities, and in materials of various compositions with known Pu contents. However, in Russia, there are no substantial quantities of accumulated impure Pu-containing materials awaiting processing either for disposition or for transuranic (TRU) geologic disposal as there are in the Us. during the Cold War, the Russian approach to Pu processing for weapons production was different from that of the US. All impure Pu- containing materials were routinely reprocessed, and the residual Pu was recovered and purified for reuse until residual Pu levels of less than 200 mg/kg (less than 200 ppm) in any discharged solid process waste streams were reached. Wastes containing less than 200 ppm Pu were routinely discharged for burial in cement waste forms. Russia is studying changing from this practice of recovery of impure Pu for reuse to immobilizing future impure Pu-containing materials into solids at higher concentrations of Pu than 200 ppm for eventual geologic disposal.

The purpose of this effort was to theoretically model the underlying metal-coating phenomena when metal particles impact a metal surface at high velocities under room temperature conditions. The physical processes involved in the novel metal-coating process called Kinetic Energy Metallization (KEM) have been theoretically and numerically analyzed. A bonding model between the incident and the target metals has been proposed and preliminary numerical results agree reasonably well with the laboratory-obtained metal samples and suggest promise of validity for the present model. However, to put the proposed bonding model on a firmer basis further numerical effort is needed to be carried for various metals and operating conditions.

Using an Atomic Force Microscope with an attachment for indentation, we have measured local, in vitro mechanical properties of healthy femoral artery tissue held in saline solution. The elastic modulus (34. 3 kPa) and viscoelastic response ({tau}sub{epsilon} {equals} 16.9 s and {tau}sub{sigma} {equals} 29.3 s) of the unstretched,intimal vessel wall have been determined using Sneddon theory and a three element model(standard linear solid) for viscoelastic materials. The procedures necessary to employ the indenting attachment to detect elastic moduli in the kPa range in liquid are described.

This feasibility study examined the effectiveness and potential of a center for collaborative research in atmospheric science and remote sensing. Strongly related to this effort was the development of a telescope facility by Howard University into an atmospheric observatory and remote sensor test-bed. Several remote sensing techniques were evaluated here and the most promising were further developed. Atmospheric assessment concentrated on aerosols, winds, constituent analysis, and the detection of hazardous agents including biologicals. This mission defined the suite of instrumentation. Being a feasibility study, the scope of the project was limited to examining the state of the technology and pushing it when possible. Research performed in applying laser technology lead to the development and subsequent patent application of a new laser heterodyne amplifier, progress toward the development of a laser probe to determine the range resolved size distribution of aerosols, and studies which may lead to the development of a laser induced fluorescence sensing technique for biologicals in the atmosphere. Research in passive atmospheric sensing helped to motivate a field experiment to better understand atmospheric radiance and radiation transport in three-dimensions.

A sonoluminescing bubble has been modeled as a thermally conducting, partially ionized, two-component radiating plasma. The recent measurements of {approximately} 100ps pulse widths by Gompf et al. are useful for constructing a consistent plasma thermal conduction model that refines our previous model. Normal thermal conduction in the gas and liquid, vapor pressure, and temperature-dependent surface tension are also included in our nonlinear hydrodynamic simulations of the growth and collapse of a gas bubble and the liquid that surrounds it. We validate the model by comparing our simulations with the experimental data of Gaitan and Holt [R{sub 0}, R{sub max}, and intensity, for different driving pressures]. We also calculate the 2D collapse of a sonoluminescing bubble in a uniform magnetic field. The numerical results show that the magnetic field induces an aspherical collapse that reduces the peak temperature in the gas and quenches SBSL. The calculated quenching is consistent with experimental data.

The purpose of this plan is to describe the preferred alternative for addressing the Motor Shops Seepage Basin located at the Savannah River site in Aiken County, Aiken, South Carolina and to provide an opportunity for public input into the remedial action selection process.

A new accelerator technology, the dielectric wall accelerator (DWA), is potentially an ultra compact accelerator/pulsed power driver. This new accelerator relies on three new components: the ultra-high gradient insulator, the asymmetric Blumlein and low jitter switches. In this report, we focused our attention on the first two components of the DWA system the insulators and the asymmetric Blumlein. First, we sought to develop the necessary design tools to model and scale the behavior of the high gradient insulator. To perform this task we concentrated on modeling the discharge processes (i.e., initiation and creation of the surface discharge). In addition, because these high gradient structures exhibit favorable microwave properties in certain accelerator configurations, we performed experiments and calculations to determine the relevant electromagnetic properties. Second, we performed circuit modeling to understand energy coupling to dynamic loads by the asymmetric Blumlein. Further, we have experimentally observed a non-linear coupling effect in certain asymmetric Blumlein configurations. That is, as these structures are stacked into a complete module, the output voltage does not sum linearly and a lower than expected output voltage results. Although we solved this effect experimentally, we performed calculations to understand this effect more fully to allow better optimization of this …