Approximately 73 m{sup 3} of heterogeneous solid material, ''sludge,'' (upper bound estimate, Packer 1997) have accumulated at the bottom of the K Basins in the 100 K Area of the Hanford Site. This sludge is a mixture of spent fuel element corrosion products, ion exchange materials (organic and inorganic), graphite-based gasket materials, iron and aluminum metal corrosion products, sand, and debris (Makenas et al. 1996, 1997). In addition, small amounts of polychlorinated biphenyls (PCBs) have been found. These small amounts are significant from a regulatory standpoint. Ultimately, it is planned to transfer the K Basins sludge to the Hanford double shell tanks (DSTs). Chemical pretreatment is required to address criticality issues and the destruction or removal of PCBs before the K Basin sludge can be transferred to the DSTs. Eleven technologies have been evaluated (Papp 1997) as potential pretreatment methods. Based on the evaluations and engineering studies and limited testing, Fluor Daniel Hanford recommended solvent washing of the K Basin sludge, followed by nitric acid dissolution and, potentially, peroxide addition (FDH 1997). The solvent washing (extraction) and peroxide addition would be used to facilitate PCB removal and destruction. Following solvent extraction, the PCBs could be distilled and concentrated for disposal …

Our theory group has discovered a mechanism for unconventional electron interaction effects in high-temperature superconductors. Electron collisions for selected structures provide an explanation for the observed neutron scattering data on high-temperature superconductors. Our University of Virginia team suggested that the observed magnetic susceptibility in copper oxide superconductors should also be seen in chromium and the metallic antiferromagnet V{sub 2}O{sub 3}, and neutron scattering experiments verify this prediction.

Semiweekly newspaper from Gilmer, Texas that includes local, state, and national news along with advertising.

OHVT Mission is to conduct, in collaboration with our heavy vehicle industry partners and their suppliers, a customer-focused national program to research and develop technologies that will enable trucks and other heavy vehicles to be more energy efficient and able to use alternative fuels while simultaneously reducing emissions.

The aspect to be investigated during this contract was an electron-beam triggered diamond switch to be used in high power modulators. Today's high power modulators require higher voltage switches than those developed to date. Specifically, the proposed 1 TeV linear collider, the NLC/ILC at the Stanford Linear Accelerator Center (SLAC), consists of two linacs with 6600 X-Band klystrons powered by 3300 high power modulators. These modulators require switches capable of handling 80 kV, switching 8 kA with pulse durations ranging from 2 ps (linac) to 6 {micro}s (pre-linac) with switching times <50 ns at pulse repetition frequencies up to 180 Hz. In addition the large number of switches and other components dictate a pulse to pulse jitter of <10 ns and a mean time between failures of at least 50,000 hours. The present approach is to use hydrogen filled thyratrons. While these switches meet the voltage and conduction current requirements they lack the required reliability (pulse to pulse jitter) and lifetime. Research to improve these aspects is in progress. A solid state switch inherently offers the required reliability and lifetime. However, Si-based switches developed to date are limited to about 5 kV and several must be stacked in series to …

Video footage from The Black Academy of Arts and Letters recorded during Dallas-based composer and musician Steven Meeks's debut album performance. The footage shows various speakers preceding the concert. The music performed ranges from jazz, ballads and Brazilian dance music as outlined in the press release and program. A small brass and percussion ensemble accompany Steven Meeks.

Semiweekly newspaper from Pawhuska, Oklahoma that includes local, state, and national news along with advertising.

Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.

Video footage from The Black Academy of Arts and Letters recorded during their event hosted by Omega Psi Psi Fraternity of Steve Meeks performing a 2 hour concert featuring his new jazz album "A Long Time Coming" on April 10th 1999. The VHS footage is generally dark but shows Meeks on stage with a small jazz band at the Clarence Muse Café Theatre.