The effort in this program is divided between modelling the particle impact event using numerical methods and computer calculations and actual measurement of erosion rates. While the results obtained from each of these activities must be combined to provide an improved understanding of particulate erosion of ductile materials, it is convenient to describe separately the progress in each activity area. The first step in the application of the finite element method to any problem is the dissolution of the continuum into small elements. The intent of this procedure is to use as few total elements as possible and to make the elements small where gradients are large and vice versa. The exact solution for the contact of a rigid cylinder with an elastic surface is available from Hertz. This solution has been compared with the computer results obtained from finite element maps containing 148, 273, and 474 elements. The correlation between the computer results and elastic solution is not good for the map with the fewest elements, but improves as the number of elements increases. Convergence to this exact solution has been examined as a function of the number of map elements as a means of improving the efficiency of …

The study is presented in five sections: design loads, conceptual designs, trade studies, cost analysis and concept evaluation and ranking. Extensive appendixes provide back up calculations and data to support the results. Environmental forces and yaw moments acting on the barge and spar in the various design sea states are presented including wave, wind and current effects. A parametric analysis illustrates the impact on holding power requirement of varying the return periods for operational and extreme sea state. The conceptual designs are presented for the barge followed by those for the spar, including configuration definition, performance characteristics, interfaces, areas for development, and deployment scenarios for selected concepts. The concept definition is followed by a set of trade studies that were performed to evaluate candidate anchor types and anchor leg materials. Parametric variations in anchor leg characteristics, wire-rope-to-chain length ratio for example, illustrate the influence of the significant design parameters on performance. An extensive cost analysis of the candidate SKSS concepts is presented, including cost estimates, life cycle cost scenarios leading to expected value of life cycle cost, and cost equivalence of operational failures. An evaluation of the eight SKSS concepts is presented, including assessment of performance and rankings based on …

The postulate that the average number of lattice displacements is directly proportional to the available energy is carried one step further; it is assumed that damage to steel (particularly in regard to brittle fracture) is proportional to the number of lattice vacancies that occur. The model, although crude, permits estimation of the relative damage resulting from differences in neutron spectra. The results can be used as a rough method of correcting damage data for the effect of the neutron-energy spectrum. Radiation damage calculations for steel, relative to those for a fission spectrum, were made for neutron spectra that result from fission neutrons penetrating water or graphite. The results were plotted as a function of effective distance from the fission source. From this plot it is possible to make a conservative estimate of the correction factor to apply to damage data obtained with different neutron spectra. (auth)

Effective energy cutoffs have been calculated on an IBM7090 computer for Cd, Gd, Sm, and B filters as functions of filter geometry, the ratio of Maxwellian to epithermal flux (assumed to be 1/E), the lower energy limit of the 1/E flux, the energy corresponding to the Maxwellian most probable (modal) velocity and filter thickness. The geometrical configurations were spherical (which on the assumptions madc is equivalent to a beam flux case), cylindrical and slab. By the use of two or three different filters (Cd and Gd and perhaps Sm) it should be possible to detect resonances in the thermal to cutoff energy regions, in addition to measuring resonance integrals and thermial cross sections of unknown nuclides. (auth)

The temperature coefficient of the Reactivity Measurement Facility was found to be 49 plus or minus 1 mu k/ deg C (1 mu k = 10/sup -6/ DELTA k/k) in the range 15.4 to l7.8 deg C. The change in the net reactivity of a standard sample was --0.48 plus or minus 0.02, --0.66 plus or minus 0.03, and --0.78 plus or minus 0.02 mu k/ deg C in three measuring positions. These low values generally make temperature corrections insignificant. The above results are compared with previous determined values. This information developed in the RMF should be generally applicable to flux-trap-type reactors such as the Advanced Reactivity Measurement Facility (ARMF) and ARMF-ll, now under construction. RMF was dismantled in April 1962. (auth)

A letter report issued by the Government Accountability Office with an abstract that begins "U.S. Postal Service (USPS) delivery performance standards and results, which are central to its mission of providing universal postal service, have been a long-standing concern for mailers and Congress. Standards are essential to set realistic expectations for delivery performance and organize activities accordingly. Timely and reliable reporting of results is essential for management, over-sight, and accountability purposes. GAO was asked to assess (1) USPS's delivery performance standards for timely mail delivery, (2) delivery performance information that USPS collects and reports on timely mail delivery, and (3) progress made to improve delivery performance information."

A letter report issued by the Government Accountability Office with an abstract that begins "The Department of Defense (DOD) established a goal to achieve total asset visibility (TAV) over 30 years ago, but to date it has been unsuccessful. GAO was requested to (1) determine whether the Army has a systems strategy for achieving TAV, (2) determine if the Army's business system investment governance structure is consistent with DOD guidance, and (3) evaluate the Army's effort to correct previously reported problems with the Logistics Modernization Program (LMP). GAO obtained an understanding of the Army's efforts to achieve TAV, oversee and manage its business system investments, and address previously reported LMP problems."

A letter report issued by the Government Accountability Office with an abstract that begins "The Social Security Administration's (SSA) Disability Insurance (DI) program paid almost $123 billion in benefits in fiscal year 2010 to more than 10 million workers and dependents. The program is poised to grow further as the baby boom generation ages. GAO examined (1) what is known about the extent to which SSA makes overpayments to, and recovers overpayments from, DI beneficiaries who exceed program earnings guidelines, and (2) potential DI program vulnerabilities that may contribute to overpayments to beneficiaries who have returned to work. To answer these questions, GAO reviewed work continuing disability review (work CDR) policies and procedures, interviewed SSA headquarters and processing center officials, visited 4 of 8 processing centers, and reviewed a random nongeneralizable sample of 60 CDR case files across those 4 centers (15 from each)."

A letter report issued by the Government Accountability Office with an abstract that begins "Through the New Starts program, the Federal Transit Administration (FTA) identifies and recommends new fixed-guideway transit projects for funding. The Safe, Accountable, Flexible, Efficient Transportation Equity Act: A Legacy for Users (SAFETEA-LU) created a separate program, commonly called Small Starts, which is intended to offer a streamlined evaluation and rating process for smaller-scale transit projects. FTA subsequently introduced a separate eligibility category within the Small Starts program for "Very Small Starts" projects. These are simple, low-risk projects that qualify for a simplified evaluation and rating process. SAFETEA-LU requires GAO to annually review FTA's New Starts process. This report presents information on (1) FTA's fiscal year 2008 funding recommendations, (2) the extent to which the New Starts pipeline has changed over time, and (3) future projected trends for the New Starts and Small Starts pipelines. To address these objectives, GAO surveyed 215 project sponsors--78 percent of which responded--and interviewed FTA officials, 15 project sponsors, and 3 industry groups."

This report describes Internet resources on major internship, fellowship, and work experience programs within the federal government. It is intended as a selective guide for students of all levels: high school, undergraduate, graduate, and postgraduate. This report will be updated annually.

A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO reviewed federal and state efforts to prevent telephone slamming, which involves switching a consumer's telephone service from one telephone company to another, and cramming, which involves placing unauthorized charges on a consumer's telephone bill for services and products, focusing on the: (1) number of complaints about slamming and cramming received by state and federal authorities; (2) types of protections implemented by state and federal authorities to increase consumers' ability to protect themselves against slamming and cramming; and (3) state and federal enforcement actions taken against slamming and cramming violations since 1996, including the names of the companies or individuals most frequently subject to such actions."

A letter report issued by the Government Accountability Office with an abstract that begins "Since 2001, the National Archives and Records Administration (NARA) has been working to acquire the Electronic Records Archives (ERA) system. As required by law, the agency submitted its fiscal year 2007 expenditure plan to congressional appropriations committees, seeking the release of $23.4 million for the development of the system. GAO's objectives in reviewing the expenditure plan were to (1) determine the extent to which the expenditure plan satisfied the legislative conditions specified in the appropriations act; (2) determine the extent to which NARA has implemented GAO's prior recommendations; and (3) provide any other observations about the expenditure plan and the ERA acquisition. GAO reviewed the expenditure plan and analyzed it against the legislative conditions and assessed NARA's progress in addressing prior recommendations. In May 2007, GAO briefed staff of the Senate subcommittee and sent a copy of the briefing to the House and Senate subcommittee staffs."

A letter report issued by the Government Accountability Office with an abstract that begins "For many years, GAO has reported that weaknesses in information security are a widespread problem with potentially devastating consequences--such as intrusions by malicious users, compromised networks, and the theft of personally identifiable information--and has identified information security as a governmentwide high-risk issue. Concerned by reports of significant vulnerabilities in federal computer systems, Congress passed the Federal Information Security Management Act of 2002 (FISMA), which permanently authorized and strengthened the information security program, evaluation, and reporting requirements for federal agencies. As required by FISMA to report periodically to Congress, in this report GAO discusses the adequacy and effectiveness of agencies' information security policies and practices and agencies' implementation of FISMA requirements. To address these objectives, GAO analyzed agency, inspectors general (IG), Office of Management and Budget (OMB), congressional, and GAO reports on information security."

A letter report issued by the Government Accountability Office with an abstract that begins "About 7,000 Medicaid providers in three selected states (Florida, New York, and Texas) had approximately $791 million in unpaid federal taxes from calendar year 2009 or earlier. This represents about 5.6 percent of the Medicaid providers reimbursed by the selected states during 2009. These 7,000 Medicaid providers with unpaid federal taxes received a total of about $6.6 billion in Medicaid reimbursements during 2009 (including American Recovery and Reinvestment Act of 2009 [Recovery Act] funds). The amount of unpaid federal taxes GAO identified is likely understated because Internal Revenue Service (IRS) taxpayer data reflect only the amount of unpaid taxes either reported on a tax return or assessed by IRS through enforcement; it does not include entities that did not file tax returns or underreported their income."

A letter report issued by the Government Accountability Office with an abstract that begins "The Bayh-Dole Act, passed in 1980, allows recipients of federal research funds the option to retain patents on any inventions they create using those funds. At the same time, the act provides the government with rights intended to ensure that the public benefits from these federal research investments. One of these rights is known as the "march-in" authority, which allows federal agencies to take control of a patent when they have credible information that certain conditions described in the act have been met. Until March 2009, the Bayh-Dole Act required GAO to report periodically on its implementation. To meet that requirement, for select federal agencies, GAO reviewed (1) the policies and procedures used to determine whether march-in authority should be exercised; (2) how the march-in authority has been used; and (3) what barriers and disincentives have been encountered in exercising the march-in authority. GAO selected four agencies for this review that accounted for 89 percent of the federal research funding for fiscal year 2006. These were the Departments of Defense and Energy (DOD and DOE), the National Aeronautics and Space Administration (NASA), and the National Institutes …

A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO reviewed the Army's acquisition strategy for its Suite of Integrated Infrared Countermeasures Systems, focusing on whether the requirements of the Army's helicopters."

A letter report issued by the Government Accountability Office with an abstract that begins "Americans increasingly rely on wireless phones, with nearly 40 percent of households now using them primarily or solely. Under federal law, the Federal Communications Commission (FCC) is responsible for fostering a competitive wireless marketplace while ensuring that consumers are protected from harmful practices. As requested, this report discusses changes in the wireless industry since 2000, stakeholders' perceptions of regulatory policies and industry practices, and the strategies FCC uses to monitor competition. To conduct this work, GAO collected and analyzed data and documents from a variety of government and private sources; conducted case studies in both rural and urban areas of four states; and interviewed stakeholders representing consumers, local and state agencies and officials, and various segments of the industry."

A letter report issued by the Government Accountability Office with an abstract that begins "The Department of Homeland Security's (DHS) fiscal year 2005 appropriations act provided $39.6 million for Immigration and Customs Enforcement's (ICE) program to modernize its information technology (IT) infrastructure. The goals of the program--which consists of seven projects and is referred to as Atlas--include improving information sharing and strengthening security. As mandated by the appropriations act, the department is to develop and submit for approval an expenditure plan for Atlas that satisfies certain legislative conditions, including a review by GAO. In performing its review of the Atlas plan, GAO was asked to (1) determine whether the plan satisfies certain legislative conditions, (2) determine the status of our prior recommendations, and (3) provide any other observations about the plan and management of the program."

A letter report issued by the Government Accountability Office with an abstract that begins "To prepare for forecasted air traffic growth, the Federal Aviation Administration (FAA), in partnership with other federal agencies and the aviation industry, is planning and implementing the Next Generation Air Transportation System (NextGen), a new satellite-based air traffic management system that will replace the current radar-based system and is expected to enhance the safety and capacity of the air transport system. GAO was asked to review FAA's metrics for (1) tracking the status of NextGen programs and the implementation of NextGen capabilities, the reliability of those metrics, and any limitations or gaps and (2) measuring the performance and outcomes of NextGen capabilities that are implemented and any limitations. GAO analyzed FAA program progress reports and associated metrics for monitoring. GAO also reviewed agency performance and accountability reports and discussed internal performance reporting methods with FAA officials."

A letter report issued by the Government Accountability Office with an abstract that begins "The virtual elimination of toxic pollutants in the Great Lakes is a goal shared by the United States and Canada. While some progress has been made, pollution levels remain unacceptably high. The Great Lakes Initiative (GLI) requires stringent water quality standards for many pollutants in discharges regulated by states administering National Pollution Discharge Elimination System (NPDES) permit programs. As requested, this report examines the (1) GLI's focus and potential impact on water quality in the Great Lakes Basin, (2) status of GLI's adoption by the states and any challenges to achieving intended goals, and (3) steps taken by the Environmental Protection Agency (EPA) for ensuring full and consistent implementation of GLI and for assessing progress toward achieving its goals."

A letter report issued by the Government Accountability Office with an abstract that begins "Following the end of the Cold War, the Department of Defense (DOD) significantly reduced its purchases of small and medium caliber ammunition and reduced the number of government-owned plants that produce small and medium caliber ammunition. Since 2000, however, DOD's requirements for these types of ammunition have increased notably. Because the success of military operations depends in part on DOD having a sufficient national technology and industrial base to meet its ammunition needs, Congress asked GAO to review DOD's ability to assess if its supplier base can meet small and medium caliber ammunition needs. Specifically, we (1) identified changes over the past several years that have increased the requirement for small and medium caliber ammunition, (2) assessed the actions DOD has taken to address the increased requirement, and (3) determined how DOD plans to ensure that it can meet future small and medium caliber ammunition needs."

A letter report issued by the Government Accountability Office with an abstract that begins "Oil in aboveground tanks can leak into soil and nearby water, threatening human health and wildlife. To prevent certain oil spills, the Environmental Protection Agency (EPA) issued the Spill Prevention, Control, and Countermeasure (SPCC) rule in 1973. EPA estimated that, in 2005, about 571,000 facilities were regulated under this rule. When finalizing amendments to the rule in 2002 and 2006 to both strengthen the rule and reduce industry burden, EPA analyzed the amendments' potential impacts and concluded that the amendments were economically justified. As requested, GAO assessed the reasonableness of EPA's economic analyses of the 2002 and 2006 SPCC amendments, using Office of Management and Budget (OMB) guidelines for federal agencies in determining regulatory impacts, among other criteria, and discussed EPA's analyses with EPA officials."

A letter report issued by the Government Accountability Office with an abstract that begins "The Department of Defense (DOD) provides health care through TRICARE--a regionally structured program that uses civilian contractors to maintain provider networks to complement health care provided at military treatment facilities (MTF). In 2004, DOD implemented extensive changes to its TRICARE contracts and regional structure. A committee report accompanying the Ronald W. Reagan National Defense Authorization Act for Fiscal Year 2005 directed GAO to provide information on implementation issues for (1) the new TRICARE contracts and (2) the new regional structure. This report also provides information on the new management tools used to assess (3) contractors' performance and (4) program performance at the MTF and regional levels."

A letter report issued by the Government Accountability Office with an abstract that begins "Individuals applying for health insurance are often denied coverage due to a pre-existing condition. The Patient Protection and Affordable Care Act appropriated $5 billion to create a temporary pool--known as the Pre- Existing Condition Insurance Plan (PCIP) program--to provide access to insurance for such individuals until new protections take effect in 2014. Twenty-seven states opted to run their own PCIPs, while 23 states and the District of Columbia opted to let the Department of Health and Human Services (HHS) run the PCIPs for their residents. Initial projections of total enrollment varied from 200,000 to 375,000, and questions have been raised about funding, implementation, and oversight of this new program. GAO examined (1) PCIP features, premiums, and criteria for demonstrating a pre-existing condition, (2) trends in PCIP enrollment and spending, including administrative costs, and (3) federal oversight activities. GAO reviewed PCIP benefits and rates; interviewed officials from selected state PCIPs, HHS, and the Office of Personnel Management (OPM), which assists HHS in administering aspects of the federally run PCIP; analyzed data provided by HHS and OPM; and examined contracts and interagency agreements. In its comments, HHS emphasized …