The analysis of surface heat fluxes and sounding profiles from SHEBA indicated possible significant effects of subsidence on the structure of stably-stratified ABLs (Mirocha et al. 2005). In this study the influence of the large-scale subsidence rate on the stably stratified atmospheric boundary layer (ABL) over the Arctic Ocean during clear sky, winter conditions is investigated using a large-eddy simulation model. Simulations are conducted while varying the subsidence rate between 0, 0.001 and 0.002 ms{sup -1}, and the resulting quasi-equilibrium ABL structure and evolution are examined. Simulations conducted without subsidence yield ABLs that are deeper, more strongly mixed, and cool much more rapidly than were observed. The addition of a small subsidence rate significantly improves agreement between the simulations and observations regarding the ABL height, potential temperature profiles and bulk heating rates. Subsidence likewise alters the shapes of the surface-layer flux, stress and shear profiles, resulting in increased vertical transport of heat while decreasing vertical momentum transport. A brief discussion of the relevance of these results to parameterization of the stable ABL under subsiding conditions in large-scale numerical weather and climate prediction models is presented.

Time-of-flight secondary ion mass spectrometry (ToF-SIMS) is employed to examine specific features observed on a polycrystalline depleted uranium sample after exposure to high purity D{sub 2} gas. The ToF-SIMS investigation, being the first of its kind on uranium, investigates a site where the deuterated form of uranium hydride (UD{sub 3}) is clearly observed to have broken through the thin, air-formed oxide. Density functional theory calculations have been performed, which confirm the stability of, and also assign structural geometries to, the various uranium containing fragments observed with SIMS. An inclusion site was also investigated using ToF-SIMS, and these data suggest that the edges of such inclusions exhibit increased D ion, and hence H ion, diffusion when compared to the surrounding surface oxide. These results offer support to the previously published hypotheses that inclusion sites on uranium surfaces exhibit an increased probability to form hydride sites under H{sub 2} exposure.

Ni-base alloys were considered for the Prometheus space reactor pressure vessel with operational parameters of {approx}900 K for 15 years and fluences up to 160 x 10{sup 20} n/cm{sup 2} (E > 0.1 MeV). This paper reviews the effects of irradiation on the behavior of Ni-base alloys and shows that radiation-induced swelling and creep are minor considerations compared to significant embrittlement with neutron ,exposure. While the mechanism responsible for radiation-induced embrittlement is not fully understood, it is likely a combination of helium embrittlement and solute segregation that can be highly dependent on the alloy composition and exposure conditions. Transmutation calculations show that detrimental helium levels would be expected at the end of life for the inner safety rod vessel (thimble) and possibly the outer pressure vessel, primarily from high energy (E > 1 MeV) n,{alpha} reactions with {sup 58}Ni. Helium from {sup 10}B is significant only for the outer vessel due to the proximity of the outer vessel to the Be0 control elements. Recommendations for further assessments of the material behavior and methods to minimize the effects of radiation damage through alloy design are provided.

Free weekly newspaper that includes business and classified advertising.

Free weekly newspaper that includes business and classified advertising.

Weekly newspaper from Port Aransas, Texas on Mustang Island that includes local, state and national news along with extensive advertising.

Daily student newspaper from the University of North Texas in Denton, Texas that includes local, state and campus news along with advertising.

Photograph of a student filling out a questionnaire at a meeting to discuss whether students should wear school uniforms in Fort Worth Texas. He is wearing a blue and black striped shirt, and there is a green purse in the background.

Notes are taken during a meeting to help decide if students should wear school uniforms in Fort Worth, Texas.

Photograph of a man at a lectern watching as notes are added to a large pad of paper. The meeting, to discuss the wearing of school uniforms, is taking place in Fort Worth, Texas.

Photograph of a speaker and her assistant reviewing the notes that have been taken during a school meeting in Fort Worth, Texas. The topic of discussion was whether students should wear school uniforms.

Photograph of a man speaking to parents and students at a school meeting to discuss the wearing of school uniforms in Fort Worth, Texas.

A parent speaks during a school meeting to determine if school uniforms would be used in Fort Worth, Texas

Mother and children listen to a presentation during a school meeting in Fort Worth, Texas. The topic being discussed is school uniforms for the students in the Fort Worth Independent School District.

Parents and students talk during a meeting to help decide whether students should wear school uniforms in Fort Worth, Texas.

Young woman reads from a paper in front of a meeting to discuss whether students should wear uniforms in the Fort Worth Independent School District.

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The report discusses the factors affecting airport and airspace capacity, Impact of Under-capacity on flight Operations and Impact on congestion on aviation safety.

This report provides information about the Major Policy Issues and Status of Negotiations on the Free Trade Area of the Americas. The FTAA began as a commitment by 34 countries to consider a comprehensive trade agreement.

This report provides information about the Implications of the Medicare Prescription Drug Benefit for Dual Eligibles and State Medicaid Programs. The report states the changes to eligibility for dual eligibles, changes to the scope of prescription coverage of the drugs.

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Free weekly newspaper that includes business and classified advertising.

This Washington Closure Hanford science and technology (S&T) plan documents the activities associated with providing S&T support to the River Corridor Closure Project for fiscal year 2006.

This report discusses appropriations for EPA water infrastructure programs, focusing on congressional earmarks in the account that funds these programs. Information on the programmatic history of EPA involvement in assisting wastewater treatment and drinking water projects is provided in two appendixes.