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Analysis of granular flow in a pebble-bed nuclear reactor

Description: Pebble-bed nuclear reactor technology, which is currently being revived around the world, raises fundamental questions about dense granular flow in silos. A typical reactor core is composed of graphite fuel pebbles, which drain very slowly in a continuous refueling process. Pebble flow is poorly understood and not easily accessible to experiments, and yet it has a ma jor impact on reactor physics. To address this problem, we perform full-scale, discrete-element simulations in realistic geometri… more
Date: April 17, 2006
Creator: Rycroft, C. H.; Grest, Gary S.; Landry, James W. & Bazant, Martin Z.
open access

Architect of the Capitol: Management and Accountability Framework Needed to Lead and Execute Change

Description: A statement of record issued by the General Accounting Office with an abstract that begins "This testimony discusses management shortcomings at the Architect of the Capitol (AOC) in such areas as strategic planning, organizational alignment, strategic human capital, financial management, and information technology. AOC has demonstrated a commitment to change through ongoing management improvements. It is also revisiting its strategic planning efforts, working with a consultant to implement best… more
Date: April 17, 2002
Creator: United States. General Accounting Office.
open access

Border Security: Observations on Costs, Benefits, and Challenges of a Department of Defense Role in Helping to Secure the Southwest Land Border

Description: Testimony issued by the Government Accountability Office with an abstract that begins "The National Defense Authorization Act for Fiscal Year 2011 mandated that GAO examine the costs and benefits of an increased Department of Defense (DOD) role to help secure the southwest land border. This mandate directed that GAO report on, among other things, the potential deployment of additional units, increased use of ground-based mobile surveillance systems, use of mobile patrols by military personnel, … more
Date: April 17, 2012
Creator: United States. Government Accountability Office.
open access

Department of Defense Actions to Modify its Commercial Communications Satellite Services Procurement Process

Description: Correspondence issued by the Government Accountability Office with an abstract that begins "The Department of Defense (DOD) continues to rely on commercial satellite communications to plan and support operations. DOD use of commercial satellite bandwidth has increased over the past few years, making the department the largest single customer of commercial satellite bandwidth. In recent years, DOD's process for acquiring commercial satellite communications has received criticism for being length… more
Date: April 17, 2006
Creator: United States. Government Accountability Office.
open access

F-35 Joint Strike Fighter: Program Has Improved in Some Areas, but Affordability Challenges and Other Risks Remain

Description: Testimony issued by the Government Accountability Office with an abstract that begins "The new F-35 acquisition baseline reflects positive restructuring actions taken by the Department of Defense (DOD) since 2010, including more time and funding for development and deferred procurement of more than 400 aircraft to future years. Overall, the program progressed on several fronts during 2012 to further improve the current outlook. The program achieved 7 of 10 key management objectives and made sub… more
Date: April 17, 2013
Creator: United States. Government Accountability Office.
open access

Federal Advertising Contracts: Distribution to Small Disadvantaged Businesses

Description: Correspondence issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO reviewed the distribution of federal contract dollars for advertising services to small disadvantaged businesses (SDB), focusing on: (1) the goals established for federal contracting with small minority-owned and women-owned businesses; (2) trend data on the distribution of prime advertising obligations for fiscal years 1994 through 1998; (3) information on the distribut… more
Date: April 17, 2000
Creator: United States. General Accounting Office.
open access

Federal Courthouses: Most Recommended New Construction Projects Do Not Qualify Under Improved Capital-Planning Process

Description: Testimony issued by the Government Accountability Office with an abstract that begins "The AMP process, which the judiciary has applied to about 67 percent of its courthouses, represents progress by the judiciary in aligning its capital-planning process with leading capital-planning practices, but the document the judiciary uses to request courthouse construction projects from Congress lacks transparency and key information. For example, the AMP process better aligns with leading practices for … more
Date: April 17, 2013
Creator: United States. Government Accountability Office.
open access

Homeland Security: Federal Efforts Are Helping to Address Some Challenges Faced by State and Local Fusion Centers

Description: Testimony issued by the Government Accountability Office with an abstract that begins "Following the September 11 terrorist attacks, state and local governments formed fusion centers, collaborative efforts to detect, prevent, investigate, and respond to criminal or terrorist activity. Recognizing that the centers are a critical mechanism for sharing information, the federal government--including the Department of Homeland Security (DHS), Department of Justice (DOJ), and the Program Manager for … more
Date: April 17, 2008
Creator: United States. Government Accountability Office.
open access

Humane Methods of Handling and Slaughter: Public Reporting on Violations Can Identify Enforcement Challenges and Enhance Transparency

Description: Testimony issued by the Government Accountability Office with an abstract that begins "In fiscal year 2007, more than 150 million cattle, sheep, and other animals destined for human consumption were slaughtered in the United States. The U.S. Department of Agriculture's (USDA) Food Safety and Inspection Service is responsible for enforcing the Humane Methods of Slaughter Act (HMSA), which mandates that animals are handled and slaughtered humanely. GAO reported on USDA's efforts to enforce HMSA i… more
Date: April 17, 2008
Creator: United States. Government Accountability Office.
open access

Medicare: Financial Outlook Poses Challenges for Sustaining Program and Adding Drug Coverage

Description: Testimony issued by the General Accounting Office with an abstract that begins "The lack of outpatient prescription drug coverage may leave Medicare's most vulnerable beneficiaries with high out-of-pocket costs. Recent estimates suggest that, at any given time, more than a third of Medicare beneficiaries lack prescription drug coverage. The rest have some coverage through various sources--most commonly employer-sponsored health plans. Recent evidence indicates that this coverage is beginning to… more
Date: April 17, 2002
Creator: United States. General Accounting Office.
open access

Portable and Transparent Message Compression in MPI Libraries to Improve the Performance and Scalability of Parallel Applications

Description: The goal of this project has been to develop a lossless compression algorithm for message-passing libraries that can accelerate HPC systems by reducing the communication time. Because both compression and decompression have to be performed in software in real time, the algorithm has to be extremely fast while still delivering a good compression ratio. During the first half of this project, they designed a new compression algorithm called FPC for scientific double-precision data, made the source… more
Date: April 17, 2009
Creator: Albonesi, David & Burtscher, Martin
open access

U.S. Postal Service: Postal Reform Law Provides Opportunities to Address Postal Challenges

Description: Testimony issued by the Government Accountability Office with an abstract that begins "When GAO originally placed the U.S. Postal Service's (the Service) transformation efforts and long-term outlook on its high-risk list in early 2001, it was to focus urgent attention on the Service's deteriorating financial situation. Aggressive action was needed, particularly in cutting costs, improving productivity, and enhancing financial transparency. GAO testified several times since 2001 that comprehensi… more
Date: April 17, 2007
Creator: United States. Government Accountability Office.
open access

U.S. Postal Service: Urgent Action Needed to Achieve Financial Sustainability

Description: Testimony issued by the Government Accountability Office with an abstract that begins "The U.S. Postal Service (USPS) continues to incur unsustainable operating deficits, has not made required payments of $11.1 billion to prefund retiree health benefits, and has reached its $15 billion borrowing limit. Thus far, USPS has been able to operate within these constraints, but now faces a critical shortage of liquidity that threatens its financial solvency and ability to finance needed capital invest… more
Date: April 17, 2013
Creator: United States. Government Accountability Office.
open access

Welfare Reform: DOT Has Made Progress in Implementing the Job Access Program but Has Not Evaluated the Impact

Description: Testimony issued by the General Accounting Office with an abstract that begins "The Department of Transportation's (DOT) Job Access and Reverse Commute (Job Access) Program, has presented implementation challenges for the Federal Transit Administration (FTA). In November 1999, DOT's process for selecting Job Access grantees was inconsistent and the basis for some selections was unclear. In response, DOT took steps to improve its process for selecting grantees by developing a standard format for… more
Date: April 17, 2002
Creator: United States. General Accounting Office.
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