Alloying is a commonly accepted method to tailor properties of semiconductor materials for specific applications. Only a limited number of semiconductor alloys can be easily synthesized in the full composition range. Such alloys are, in general, formed of component elements that are well matched in terms of ionicity, atom size, and electronegativity. In contrast there is a broad class of potential semiconductor alloys formed of component materials with distinctly different properties. In most instances these mismatched alloys are immiscible under standard growth conditions. Here we report on the properties of GaN1-xAsx, a highly mismatched, immiscible alloy system that was successfully synthesized in the whole composition range using a nonequilibrium low temperature molecular beam epitaxy technique. The alloys are amorphous in the composition range of 0.17<x<0.75 and crystalline outside this region. The amorphous films have smooth morphology, homogeneous composition, and sharp, well defined optical absorption edges. The band gap energy varies in a broad energy range from ~;;3.4 eV in GaN to ~;;0.8 eV at x~;;0.85. The reduction in the band gap can be attributed primarily to the downward movement of the conduction band for alloys with x>0.2, and to the upward movement of the valence band for alloys with x<0.2. …

Archaeological survey of proposed and alternate pipeline routes located in Denton County, Texas.

This report discusses about requiring Government Procurements to come from Domestic Sources related to The Buy American Act of 2007.

The Buy American Act is the major domestic preference statute governing procurement by the federal government. Essentially it attempts to protect domestic labor by providing a preference for American goods in government purchases. In the 110th Congress a new reporting requirement was added to the Buy American Act. The Buy American Improvement Act of 2007 would make statutory the definition of "American made," increase the domestic content requirement from 50% to 75%, and place limits upon the "inconsistent with the public interest" and "use outside of the United States" exceptions to the act.

A letter report issued by the Government Accountability Office with an abstract that begins "Carbon offsets--reductions of greenhouse gas emissions from an activity in one place to compensate for emissions elsewhere--are a way to address climate change by paying someone else to reduce emissions. To be credible, an offset must be additional--it must reduce emissions below the quantity emitted in a business-as-usual scenario--among other criteria. Assessing credibility is inherently challenging because it is difficult to make business-as-usual projections. Outside the U.S., offsets may be purchased on compliance markets to meet requirements to reduce emissions. In the U.S., there are no federal requirements and offsets may be purchased in the voluntary market. GAO was asked to examine (1) the scope of the U.S. voluntary carbon offset market, including the role of the federal government; (2) the extent to which mechanisms for ensuring the credibility of offsets are available and used and what, if any, related information is shared with consumers; and (3) trade-offs associated with increased oversight of the U.S. market and including offsets in climate change mitigation policies. This report is based on analysis of literature and data, interviews with stakeholders, and GAO's purchase of offsets."

It is argued that the key difference of the cylindrical Hall thruster (CHT) as compared to the end-Hall ion source cannot be exclusively attributed to the magnetic field topology [Tang et al. J. Appl. Phys., 102, 123305 (2007)]. With a similar mirror-type topology, the CHT configuration provides the electric field with nearly equipotential magnetic field surfaces and a better suppression of the electron cross-field transport, as compared to both the end-Hall ion source and the cylindrical Hall ion source of Tang et al.

In 2008, Pacific Northwest National Laboratory evaluated the Hofer Dam fish screen and provided technical assistance at two other fish passage sites as requested by the Bonneville Power Administration, the Walla Walla Watershed Council, or the Confederated Tribes of the Umatilla Indian Reservation. Evaluation of new sites such as Hofer Dam focuses on their design, construction, operation, and maintenance to determine if they effectively provide juvenile salmonids with safe passage through irrigation diversions. There were two requests for technical assistance in 2008. In the first, the Confederated Tribes of the Umatilla Indian Reservation requested an evaluation of the Nursery Bridge fish screens associated with the fish ladder on the east side of the Walla Walla River. One set of brushes that clean the screens was broken for an extended period. Underwater videography and water velocity measurements were used to determine there were no potential adverse effects on juvenile salmonids when the west set of screens was clean enough to pass water normally. A second request, received from the National Marine Fisheries Service and the Walla Walla Watershed Council, asked for evaluation of water velocities through relatively new head gates above and adjacent to the Eastside Ditch fish screens on the …

This report discusses the background, status, and current issues of the Joint Strike Fighter (JSF) program. The Defense Department's F-35 Lightning II JSF is one of three aircraft modernization programs in tactical aviation, the others being the Air Force F-22A fighter and the Navy F/A-18E/F fighter/attack plane.

This report documents the laboratory results of RPP-PLAN-35958, Test Plan for the Effluent Treatment Facility to Reduce Chrome (VI) to Chrome (III) in the Secondary Waste Stream With the exception of the electrochemical corrosion scans, all work was carried out at the Center for Laboratory Science (CLS) located at the Columbia Basin College. This document summarizes the work carried out at CLS and includes the electrochemical scans and associated corrosion rates for 304 and 316L stainless steel.

A letter report issued by the Government Accountability Office with an abstract that begins "In 2006, the subcommittee concluded there was a need for increased accountability and transparency for unspent funds in federal programs and agencies, and requested GAO review the status of balances not drawn down by grantees by the time the grants' period of availability had ended. GAO was asked to answer these questions: (1) to what extent are there undisbursed grant balances in expired grant accounts and do they share any program characteristics?; and (2) do these expired grants share grant management challenges and how have federal agencies improved grant closeout and diminished undisbursed balances? To do this, GAO analyzed grant balance data from the largest federal grant payment system; reviewed grant management problems and corrective actions from more than 150 audit reports; and reviewed guidance from the Office of Management and Budget (OMB) and the Code of Federal Regulations."

The Home Retention and Economic Stabilization Act of 2008 would defer foreclosure for eligible mortgage borrowers for up to 270 days. If passed, the bill would give extra time to some borrowers and lenders to consider alternatives to foreclosure, including traditional loss mitigation and participation in the new Federal Housing Administration (FHA) program for refinancing troubled loans. Some policymakers believe that a moratorium on foreclosures could help stabilize housing markets and alleviate problems from the subprime financial turmoil. This report explores this issue in detail and analyzes the individual aspects of the relevant legislation.

This report presents the results of laboratory characterization and testing of two samples (designated 20406 and 20407) of residual waste collected from tank S-112 after final waste retrieval. These studies were completed to characterize the residual waste and assess the leachability of contami¬nants from the solids. This is the first report from this PNNL project to describe the composition and leach test data for residual waste from a salt cake tank. All previous PNNL reports (Cantrell et al. 2008; Deutsch et al. 2006, 2007a, 2007b, 2007c) describing contaminant release models, and characterization and testing results for residual waste in single-shell tanks were based on samples from sludge tanks.

Based on data from the Census Bureau's current population survey, an estimated 8.9 million children under age 19 were uninsured in 2007, representing 11.3% of all children in the United States. This report contains information on uninsured children in the United States by state.

Shock waves passing through a metal sample can produce ejecta particulates at a metal-vacuum interface. Holography records particle size distributions by using a high-power, short-pulse laser to freeze particle motion. The sizes of the ejecta particles are recorded using an in-line Fraunhofer holography technique. Because the holographic plate would be destroyed in an energetic environment, a high-resolution lens has been designed to relay the interference fringes to a safe environment. Particle sizes within a 12-mm-diameter, 5-mm-thick volume are recorded onto holographic film. To achieve resolution down to 0.5 μm, ultraviolet laser (UV) light is needed. The design and assembly of a nine-element lens that achieves >2000 lp/mm resolution and operates at f/0.89 will be described. To set up this lens system, a doublet lens is temporarily attached that enables operation with 532-nm laser light and 1100 lp/mm resolution. Thus, the setup and alignment are performed with green light, but the dynamic recording is done with UV light. During setup, the 532-nm beam provides enough focus shift to accommodate the placement of a resolution target outside the ejecta volume; this resolution target does not interfere with the calibrated wires and pegs surrounding the ejecta volume. A television microscope archives images of …

Image acquisition with a CCD camera is a single-press-button activity: after selecting exposure time and adjusting illumination, a button is pressed and the acquired image is perceived as the final, unmodified proof of what was seen in the microscope. Thus it is generally assumed that the image processing steps of e.g., 'dark-current correction' and 'gain normalization' do not alter the information content of the image, but rather eliminate unwanted artifacts. Image quality therefore is, among a long list of other parameters, defined by the dynamic range of the CCD camera as well as the maximum allowable exposure time depending on sample drift (ignoring sample damage). Despite the fact that most microscopists are satisfied with present, standard image quality we found that it is a relatively easy to improve on existing routines in at least two aspects: (1) Suppression of lateral image drift during acquisition by using significantly shorter exposure times with a plurality of exposures (3D-data set); and (2) Improvement in the Signal/Noise ratio by averaging over a given data set by exceeding the dynamic range of the camera.

This report presents various governmental and non-governmental estimates of Iraqi police and security forces fatalities. The Department of Defense (DOD) regularly updates total U.S. military deaths and wounded statistics from Operation Iraqi Freedom (OIF), as reflected in CRS Report RS21578, Iraq: U.S. Casualties, and has released the monthly pattern of Iraqi security forces deaths. For information on Iraqi civilian deaths, see CRS Report RS22537, Iraqi Civilian Deaths Estimates. Because these estimates are based on varying time periods and have been created using differing methodologies, readers should exercise caution when using them and should look on them as guideposts rather than as statements of fact.

We investigate the magnetic coupling at the Co/NiO interface using soft x-ray magnetic linear dichroism (XMLD) and circular dichroism taking explicitly into account the recently observed angular dependence of the XMLD with respect to the crystallographic axes. We find that the Co moments are aligned perpendicular to the NiO moments. We discuss the impact of the anisotropic XMLD on the intensity ratio of the two peaks at the Ni L{sub 2} edge, which is commonly employed to determine the spin orientation in antiferromagnets using XMLD.

A letter report issued by the Government Accountability Office with an abstract that begins "In 2004, Congress directed the Department of Defense (DOD) to establish a comprehensive policy to prevent and respond to sexual assaults involving servicemembers. Though not required to do so, the Coast Guard has established a similar policy. In response to congressional requests and Senate Report No. 110-77, GAO evaluated the extent to which DOD and the Coast Guard (1) have developed and implemented policies and programs to prevent, respond to, and resolve sexual assault incidents involving servicemembers; (2) have visibility over reports of sexual assault involving servicemembers; and (3) exercise oversight over reports of sexual assault involving servicemembers. To conduct this review, GAO reviewed legislative requirements and DOD and Coast Guard guidance; analyzed sexual assault incident data; and obtained through surveys and interviews the perspective on sexual assault matters of more than 3,900 servicemembers."

This report describes efforts carried out during early 2008 to determine some of the science drivers for the"NERSC-6" next-generation high-performance computing system acquisition. Although the starting point was existing Greenbooks from DOE and the NERSC User Group, the main contribution of this work is an analysis of the current NERSC computational workload combined with requirements information elicited from key users and other scientists about expected needs in the 2009-2011 timeframe. The NERSC workload is described in terms of science areas, computer codes supporting research within those areas, and description of key algorithms that comprise the codes. This work was carried out in large part to help select a small set of benchmark programs that accurately capture the science and algorithmic characteristics of the workload. The report concludes with a description of the codes selected and some preliminary performance data for them on several important systems.

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This report provides background information and recent developments in Russia-Georgia conflict in South Ossetia. The report discusses renewed conflict in South Ossetia, implications for Georgia and Russia, and international and U.S. responses.

This document describes the methodology for determining the saturation temperature in waste tanks. The saturation temperature is used to calculate neutral buoyancy ratio.

Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Greg Abbott, regarding a legal question submitted for clarification; Maximum distance that a county may require that a sexually oriented business be located from a residence, church, elementary school, and other designated facilities (RQ-0680-GA)

A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.