In Stack and Rustad (2007), the reactive flux method (Rey and Hynes, 1996) and molecular dynamics (MD) were used to simulate the {001} barite-water interface structure and water exchange rate of aqueous barium ions and barium surface species. Atomic-level mineralwater interfacial structure and kinetics are being studied with increasing precision due to advances in spectroscopic methods at synchrotron x-ray sources as well as improved computational capacity. Better characterization of these interfaces in turn is leading to advances in the understanding of many macroscopic geochemical properties. Overall the barite-water interfacial structure was found to compare well to that estimated using X-ray reflectivity (XRR) measurements (Fenter et al., 2001), but there was an important difference: the MD predicted an intricate water structure present at the interface with one major peak and several minor peaks whereas the XRR found only a single layer of water. This discrepancy is thought to result from a limited resolution in the Fenter et al. (2001) study as well as over-coordination of surface sulfates by the MD model.

None

The animal sector of agriculture has undergone major changes in the last several decades: organizational changes within the industry to enhance economic efficiency have resulted in larger confined production facilities that often are geographically concentrated. These changes, in turn, have given rise to concerns over the management of animal wastes and potential impact on environmental quality.

This report discusses issues Congress faces regarding the Navy's proposed FY2011 budget, particularly as relating to destroyer procurement plans and programs.

This report presents information on federal programs targeted to unemployed workers specifically, but does not attempt to discuss means-tested programs (such as Medicaid or SSI) that are available regardless of employment status.

This report provides background information and analysis of the U.S.-EU economic relationship for Members of the 111th Congress as they contemplate the costs and benefits of closer U.S. economic ties with the EU. It examines the economic and political framework of the relationship and the scope and magnitude of the ties based on data from various sources. In addition, the report analyzes the implications these factors have for U.S. economic policy toward the EU. The report will be revised as events warrant.

This report covers the question of how the United States should respond to China's military modernization effort, including its naval modernization effort, has emerged as a key issue in U.S. defense planning. The question is of particular importance to the U.S. Navy, because many U.S. military programs for countering improved Chinese military forces would fall within the Navy's budget. Potential oversight issues for Congress include the following: whether the U.S. Navy in coming years will be large enough to adequately counter improved Chinese maritime anti-access forces while also adequately performing other missions of interest to U.S. policymakers around the world; the Navy's ability to counter Chinese ASBMs and submarines; and whether the Navy, in response to China's maritime anti-access capabilities, should shift over time to a more distributed fleet architecture.

A letter report issued by the Government Accountability Office with an abstract that begins "Competition is a critical tool for achieving the best return on the government's investment. While federal agencies are generally required to award contracts on the basis of full and open competition, they are permitted to award noncompetitive contracts in certain situations. Agencies are also required to establish competition advocates to promote competition. GAO assessed (1) trends in noncompetitive contracts and those receiving only one offer when competed; (2) exceptions to and factors affecting competition; (3) whether contracting approaches reflected sound procurement practices; and (4) how agencies are instituting the competition advocate role. GAO reviewed federal procurement data and 107 randomly selected contracts at the departments of Defense, Interior, and Homeland Security (which had among the highest noncompetitive obligations in fiscal year 2008) and interviewed contracting and program officials, competition advocates, and contractors."

A letter report issued by the Government Accountability Office with an abstract that begins "Major defense acquisition programs (MDAP) are used to acquire, modernize, or extend the service life of the Department of Defense's (DOD) most expensive assets, primarily military equipment. The Weapon Systems Acquisition Reform Act of 2009 (P.L. 111-23), section 304(b), directed us to perform a review of weaknesses in DOD's operations that affect the reliability of financial information for assets acquired through MDAP. To do so, GAO identified and reviewed previously reported weaknesses that impair DOD's ability to provide reliable cost information for military equipment acquired through MDAPs, and determined what actions DOD has taken to address them. GAO searched databases of audit reports issued during calendar years 2005 through 2009 to identify previously reported weaknesses. Using applicable criteria, GAO assessed whether the actions taken by DOD adequately addressed these weaknesses."

A letter report issued by the Government Accountability Office with an abstract that begins "As fiscal constraints increasingly shape Navy shipbuilding plans, the pressure to increase efficiency mounts. Modernizing facilities and equipment at shipyards that build Navy ships can lead to improved efficiency, ultimately reducing the cost of constructing ships. In response to a request from the House Appropriations Subcommittee on Defense, GAO (1) identified investments in facilities and equipment at privately-owned shipyards over the last 10 years; (2) determined the Navy's role in financing facilities and equipment investments at these shipyards; and (3) evaluated how the Navy ensures investments result in expected outcomes. To address these objectives, GAO analyzed shipyard investment data over the past 10 years; interviewed shipyard, corporate, and Navy officials; and reviewed contracts, investment business cases, and other Navy and contractor documents."