Plastic behavior has previously been observed in metallic interconnects undergoing high current density electromigration (EM) loading. In this study of Cu interconnects, using the synchrotron technique of white beam X-ray microdiffraction, we have further found preliminary evidence of a texture correlation. In lines with strong (111) textures, the extent of plastic deformation is found to be relatively large compared to that of weaker textures. We suggest that this strong (111) texture may lead to an extra path of mass transport in addition to the dominant interface diffusion in Cu EM. When this extra mass transport begins to affect the overall transport process, then the effective diffusivity, D{sub eff}, of the EM process is expected to deviate from that of interface diffusion only. This would have fundamental implications. We have some preliminary observations that this might be the case, and we report its implications for EM lifetime assessment in this manuscript.

Successful exploitation of the vast amount of heat stored beneath the earth’s surface in hydrothermal and fluid-limited, low permeability geothermal resources would greatly expand the Nation’s domestic energy inventory and thereby promote a more secure energy supply, a stronger economy and a cleaner environment. However, a major factor limiting the expanded development of current hydrothermal resources as well as the production of enhanced geothermal systems (EGS) is insufficient knowledge about the chemical processes controlling subsurface fluid flow. With funding from past grants from the DOE geothermal program and other agencies, we successfully developed advanced equation of state (EOS) and simulation technologies that accurately describe the chemistry of geothermal reservoirs and energy production processes via their free energies for wide XTP ranges. Using the specific interaction equations of Pitzer, we showed that our TEQUIL chemical models can correctly simulate behavior (e.g., mineral scaling and saturation ratios, gas break out, brine mixing effects, down hole temperatures and fluid chemical composition, spent brine incompatibilities) within the compositional range (Na-K-Ca-Cl-SO4-CO3-H2O-SiO2-CO2(g)) and temperature range (T < 350°C) associated with many current geothermal energy production sites that produce brines with temperatures below the critical point of water. The goal of research carried out under DOE grant …

Application of time domain reflectometry (TDR) in soil hydrology often involves the conversion of TDR-measured dielectric permittivity to water content using universal calibration equations (empirical or physically based). Deviations of soil-specific calibrations from the universal calibrations have been noted and are usually attributed to peculiar composition of soil constituents, such as high content of clay and/or organic matter. Although it is recognized that soil disturbance by TDR waveguides may have impact on measurement errors, to our knowledge, there has not been any quantification of this effect. In this paper, we introduce a method that estimates this error by combining two models: one that describes soil compaction around cylindrical objects and another that translates change in bulk density to evolution of soil water retention characteristics. Our analysis indicates that the compaction pattern depends on the mechanical properties of the soil at the time of installation. The relative error in water content measurement depends on the compaction pattern as well as the water content and water retention properties of the soil. Illustrative calculations based on measured soil mechanical and hydrologic properties from the literature indicate that the measurement errors of using a standard three-prong TDR waveguide could be up to 10%. We …

This report describes provisions in the 2008 farm bill (P.L. 110-234) related to Section 32 appropriations and how non-transferred money (funding not put toward child nutrition programs) may be spent. It includes an overfiew of how Section 32 funds have generally been used and the implications of the new restrictions.

The Federal Protective Service (FPS) -- within U.S. Immigration Customs Enforcement (ICE) in the Department of Homeland Security (DHS) -- is responsible for protecting federal government property, personnel, visitors, and customers, including property leased by the General Services Administration (GSA). FPS currently employs over 15,000 contract security guards to protect federal property. DHS intends, according to its FY2009 budget justification, to continue the use of contract security guards to focus FPS activities on maintaining security policy and standards, conducting building security assessments, and monitoring federal agency compliance with security standards.

Other written product issued by the Government Accountability Office with an abstract that begins "The federal government will need to make the most of its resources to meet the emerging challenges of the 21st century. As new priorities emerge, policymakers have demonstrated interest in user fees as a means of financing new and existing services. User fees can be designed to reduce the burden on taxpayers to finance the portions of activities that provide benefits to identifiable users above and beyond what is normally provided to the public. By charging the costs of those programs or activities to beneficiaries, user fees can also promote economic efficiency and equity. However, to achieve these goals, user fees must be well designed. GAO was asked to study how user fee design characteristics may influence the effectiveness of user fees. Specifically, GAO examined how the four key design and implementation characteristics of user fees--how fees are set, collected, used, and reviewed--may affect the economic efficiency, equity, revenue adequacy, and administrative burden of cost-based fees. GAO reviewed economic and policy literature on federal and nonfederal user fees, including prior GAO work, and used relevant case examples to illustrate different types of design elements and the …

A letter report issued by the Government Accountability Office with an abstract that begins "The Navy faces affordability challenges as it supports a high pace of operations and increasing ship procurement costs. The Navy has used multiple crews on some submarines and surface ships and has shown it to increase a ship's operational availability. GAO was asked to evaluate the extent to which the Navy, for ship rotational crewing, has (1) employed a comprehensive management approach, (2) developed and implemented guidance, (3) systematically collected, analyzed data, and reported findings, and (4) systematically collected and used lessons learned. To conduct this work, GAO analyzed Department of Defense (DOD) and Navy documentation and best practices for transformation, conducted focus groups, and interviewed DOD and Navy officials."

Congress appropriated, in P.L. 110-329, approximately $4.36 billion for state and local homeland security assistance programs. This is approximately $135 million more than was appropriated in FY2008 ($4.22 billion). Congress chose not to fund the Real ID program in FY2009, however, it did appropriate funding ($2 million) for a new assistance program titled the Center for Counterterrorism and Cyber Crime at Norwich University in Northfield, Vermont.

This report identifies the predominant factors behind the 2007/2008-crop-year market conditions for major agricultural commodities, with a focus on U.S. farm program crops. In addition, it briefly discusses how higher, more volatile commodity prices have impacted farm incomes, government farm programs, hedging activities, the livestock and food processing sectors, food prices, and the international food security situation. It reviews both the near- and longer-term commodity price outlook, and finally, it discusses various viewpoints and policy options that have been suggested as possible responses to the perceived causes and consequences of the unusually high commodity prices.

This report examines the causes, consequences, and outlook for prices of the major U.S. program crops, and provides references for more detailed information.

The K-25 Building at the East Tennessee Technology Park is relying on the use of Non-Destructive Assay (NDA) methods for characterizing hold-up materials in process equipment. The characterization data is used for many purposes including mass estimates for nuclear criticality safety (NCS) and waste disposition. This paper addresses the sensitivity of certain parameters in the NDA process to overall mass measurement results.

The United States is the world's major provider of international food aid to low-income developing countries. This report provides three indicators of the U.S. contribution to global food aid: (1) shipments of major donors compiled by the International Grains Council, (2) U.S. contributions to the United Nations World Food Program (WFP), and (3) the U.S. commitment under the Food Aid Convention (FAC).

A letter report issued by the Government Accountability Office with an abstract that begins "In 1996, the United States and more than 180 world leaders pledged to halve the number of undernourished people globally by 2015 from the 1990 level. The global number has not decreased significantly--remaining at about 850 million in 2001-2003--and the number in sub-Saharan Africa has increased from about 170 million in 1990-1992 to over 200 million in 2001-2003. On the basis of analyses of U.S. and international agency documents, structured panel discussions with experts and practitioners, and fieldwork in four African countries, GAO was asked to examine (1) factors that contribute to persistent food insecurity in sub-Saharan Africa and (2) the extent to which host governments and donors, including the United States, are working toward halving hunger in the region by 2015."

This report discusses the International Space Station (ISS) program, which began in 1993, with Russia joining the United States, Europe, Japan, and Canada.

The following casualty data was compiled by the Department of Defense (DOD), as tallied from the agency's press release. Table 1 provides statistics on fatalities during Operation Iraqi Freedom, which began on March 19, 2003, and is ongoing, as well as on the number of fatalities since May 1, 2003, plus statistics on those wounded, but not killed, since March 19, 2003. A detailed casualty summary that includes data on deaths by cause, as well as statistics on soldiers wounded in action, is available at the following DOD website: [http://siadapp.dmdc.osd.mil/personnel/CASUALTY/castop.htm].

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This report discusses the Navy's proposed FY2010 budget requests (about $1.0 billion) for the procurement of 22 F/A- 18E/F Super Hornet strike fighters and about $1.6 billion for the procurement of 12 EA-18G Growler electric attack aircraft. The issue for Congress is whether to approve, reject, or modify the Navy's FY2010 funding request for procurement of nine F/A-18E/Fs, and whether to approve a third MYP arrangement for procuring Super Hornets and Growlers in FY2010-FY2014.

The Navy for several years has carried out a variety of activities related to what the Administration refers to as the Global War on Terrorism (GWOT). The Navy states that as of February 2008, more than 11,300 Navy sailors (including Individual Augmentees) were ashore supporting ground forces in the U.S. Central Command region (including Iraq and Afghanistan). The Navy's role in the GWOT raises several potential oversight issues for Congress.

The Sultanate of Oman is a long-time U.S. ally in the Persian Gulf; it has allowed U.S. access to its military facilities for virtually every U.S. military operation in and around the Gulf since 1980. Partly in appreciation, the United States signed a free trade agreement (FTA) with Oman on January 19, 2006; implementing legislation was signed on September 26, 2006 (P.L. 109-283). Sultan Qaboos has been opening the political process slowly while managing an economy that lacks vast oil reserves. This report, prepared with the assistance of Kim Klarman, will be updated.

Recently, much research has been directed towards finding a replacement cathode material for LiCoO{sub 2} combining high performance with lower cost and toxicity. One promising candidate material is the mixed transition metal oxide LiNi{sub 0.4}Co{sub 0.2}Mn{sub 0.4}O{sub 2}, which delivers 180 mAh/g below 4.4 V versus Li/Li{sup +} (1, 2). However, in this material, there is 4% anti-site cation mixing, which hinders the mobility of lithium within the lattice, adversely affecting its rate performance in lithium batteries. Ongoing work in our lab has shown that partial or full substitution of cobalt with aluminum, LiNi{sub 0.4}Co{sub 0.2}Mn{sub 0.4}O{sub 2} (0 &lt; y {le} 0.2), can lead to significant improvements in rate performance (3). In particular, LiNi{sub 0.4}Co{sub 0.2}Mn{sub 0.4}O{sub 2} shows greatly improved rate capability with almost no sacrifice in the overall capacity delivered at low rates between 2.0 and 4.3V (Figure 1). The smaller ionic radius of Al{sup 3+} in octahedral coordination (0.535 {angstrom}) compared to Li{sup +} (0.76 {angstrom}) creates a strong driving force for the formation of a more lamellar structure in the aluminum containing materials (4, 5). XRD experiments and subsequent Rietveld refinement (Figure 2) reveal a significant decrease in anti-site defect concentration upon aluminum substitution, dropping …

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A letter report issued by the Government Accountability Office with an abstract that begins "The federal Bureau of Prisons (BOP) is responsible for the custody and care of more than 201,000 federal offenders. To provide housing for the federal prison population, BOP manages the construction and maintenance of its prison facilities and oversees contract facilities. GAO was asked to look into recent increases in estimated costs for Federal Correctional Institution (FCI) construction projects located in Mendota, CA; Berlin, NH; and McDowell, WV, which have led to almost $278 million or 62 percent more being provided in funding than initially estimated. This report addresses (1) the reasons for the changes to the estimated costs and (2) the actions BOP has taken--or plans to take--to control future cost increases and delays. GAO reviewed and analyzed BOP's fiscal years 2001 to 2009 budget documents, files for these three projects, and project management guidance. GAO also reviewed government and industry guidance on project management and met with BOP officials."

This report examines amendments to the federal student loan programs made under P.L. 110-227.

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