Two-phase turbines open the possibility of new types of power cycles operating with extremely wet mixtures of steam and water, organic fluids, or immiscible liquids and gases. Possible applications are geothermal power, waste-heat recovery, refrigerant expansion, solar conversion, transportation turbine engines, and engine bottoming cycles. A theoretical model for two-phase impulse turbines was developed. Apparatus was constructed for testing one- and two-stage turbines (using speed decrease from stage to stage). Turbines were tested with water-and-nitrogen mixtures and Refrigerant 22. Nozzle efficiencies were 0.78 (measured) and 0.72 (theoretical) for water-and-nitrogen mixtures at a water/nitrogen mixture ratio of 68, by mass; and 0.89 (measured) and 0.84 (theoretical) for Refrigerant 22 expanding from 0.02 quality to 0.28 quality. Blade efficiencies (shaft power before windage and bearing loss divided by nozzle jet power) were 0.63 (measured) and 0.71 (theoretical) for water-and-nitrogen mixtures and 0.62 (measured) and 0.63 (theoretical) for Refrigerant 22 with a single-stage turbine, and 0.70 (measured) and 0.85 (theoretical) for water-and-nitrogen mixtures with a two-stage turbine.

A letter report issued by the Government Accountability Office with an abstract that begins "While FDA has taken several important steps toward modernizing its IT environment, much remains to be done. FDA reported spending about $400 million for IT investments in fiscal year 2011; however, the agency currently lacks a comprehensive IT inventory that identifies and provides key information about the systems it uses and is developing. Office of Management and Budget (OMB) and GAO guidance call for federal agencies to maintain such an inventory in order to monitor and manage their IT investments. This inventory should include information on each system, such as costs, functionality or purpose, and status. However, FDA does not have such a comprehensive list of its systems. Instead, the agency points to budget documents required by OMB, which included information on 44 IT investments for fiscal year 2011. The agency also provided a partial list of 21 mission-critical systems and modernization initiatives. Nonetheless, agency officials acknowledged that these documents do not identify all FDA’s systems or the complete costs, purpose, or status of each system. Until the agency has a complete and comprehensive inventory, it will lack critical information needed to effectively assess its IT …

A letter report issued by the Government Accountability Office with an abstract that begins "The Air Force is on the verge of making a major commitment to the multi-billion dollar E-10A Multi-sensor Command and Control Aircraft program. Due to the substantial investment needed and technological challenges in developing the aircraft, the Subcommittee on Tactical Air and Land Forces asked GAO to examine the soundness of the E-10A business case as well as the risks associated with the current acquisition strategy."

A letter report issued by the Government Accountability Office with an abstract that begins "Since 2003, the Future Combat System (FCS) program has been the centerpiece of the Army's efforts to transition to a lighter, more agile, and more capable combat force. In 2009, however, concerns over the program's performance led to the Secretary of Defense's decision to significantly restructure and ultimately cancel the program. As a result, the Army has outlined a new approach to ground force modernization. This report (1) outlines the Army's preliminary post-FCS plans and (2) identifies the challenges and opportunities the Department of Defense (DOD) and the Army must address as they proceed with Army ground force modernization efforts. To meet these objectives, GAO reviewed key documents, performed analyses, visited test facilities where the Army evaluated FCS equipment, and interviewed DOD and Army officials."

A letter report issued by the General Accounting Office with an abstract that begins "U.S. asparagus imports increased in the 1990s and now comprise nearly one-half of the asparagus consumed in the United States. Peru is the second largest source of imported asparagus and benefits from duty-free treatment under the Andean Trade Preference Act (ATPA). ATPA is estimated to have displaced between two and eight percent of the value of domestic production from what it would have been without the act. Although the supply of fresh asparagus from imports has increased since ATPA's enactment, consumer demand has been strong, and prices have risen. In addition, an apparent increase in consumer preference for fresh asparagus has contributed to a downward shift in the domestic demand for processed asparagus. Most of the decline in the domestic production of processed asparagus occurred in Michigan and Washington, the two states that produce most canned and frozen asparagus. If ATPA is reauthorized, domestic producers of asparagus and, in particular, asparagus for processing, will likely face continued displacement, but consumers can expect continued benefits from the year-round availability of fresh asparagus. However, some of this displacement will likely occur even if ATPA is not reauthorized and …

A letter report issued by the General Accounting Office with an abstract that begins "Although some welfare recipients who might seem hard to employ are able to successfully enter the workforce, others have needed considerable time and support to become work-ready. As a result, some states have begun to implement or are considering strategies to help hard-to-employ recipients join the workforce. To be successful in moving hard-to-employ Temporary Assistance for Needy Families (TANF) recipients into the workforce within their 60-month time limit for federal benefits, states must develop programs and provide work and work-preparation activities tailored to the needs of their hard-to-employ recipients and they must ensure that recipients with characteristics that impede employment have access to programs and activities that meet their needs. Some states believe that they would be better able to accomplish this if they (1) had caseload data on the number and characteristics of hard-to-employ TANF recipients, particularly those who will reach their 60-month limit before they are able to work and (2) used a range of work and work-preparation activities that meet the needs of hard-to-employ recipients, including activities that extend beyond those that meet federal work participation requirements."

A letter report issued by the Government Accountability Office with an abstract that begins "Over the next 5 years, the Missile Defense Agency (MDA) expects to invest $49 billion in the BMD system's development and fielding. MDA's strategy is to field new capabilities in 2-year blocks. In January 2006, MDA initiated its second block--Block 2006--to protect against attacks from North Korea and the Middle East. Congress requires GAO to assess MDA's progress annually. This year's report addresses MDA's progress during fiscal year 2006 and follows up on program oversight issues and the current status of MDA's quality assurance program. GAO assessed the progress of each element being developed by MDA, examined acquisition laws applicable to major acquisition programs, and reviewed the impact of implemented quality initiatives."

A letter report issued by the Government Accountability Office with an abstract that begins "The development of IAE has occurred in two stages using different acquisition strategies. In 2001, GSA began establishing a portfolio of standardized government-wide data systems through an acquisition strategy known as “adopt, adapt, acquire.” GSA adopted or adapted existing agency-specific systems for government-wide use, or if no viable system met an identified need, GSA acquired a new system. These efforts resulted in a portfolio of nine data systems. In 2008, GSA began consolidating its portfolio of systems into one integrated system called the System for Award Management (SAM). In developing the system, GSA hoped to eliminate redundancy, reduce costs, and improve efficiency. Unlike the existing systems that were each designed, developed, and operated by a single contractor, IAE relies on multiple vendors to perform these same tasks for SAM. The intent of this approach is to enhance competition and innovation and for the government to own the software associated with the system. SAM will be developed in phases. In each phase, capabilities from selected IAE systems will be added to SAM and those legacy systems will be shut down."

A letter report issued by the General Accounting Office with an abstract that begins "The Department of Housing and Urban Development (HUD) spends $7 billion annually to provide decent, safe, and sanitary housing for low-income households in about 14,000 rental properties nationwide. Yet, many public housing properties have been unsafe and unsanitary for several decades. To identify and correct these problems, HUD began a Public Housing Assessment System (PHAS) to evaluate the performance of public housing authorities. Although HUD is still testing and revising PHAS, it has begun to designate certain housing authorities as troubled and to assign them to recovery centers, where they receive technical and other assistance. HUD also created the Public and Indian Housing Information Center (PIC) database to collect information on funding, compliance, and other problems that fall outside the scope of PHAS. PHAS includes four performance indicators: (1) the physical condition of the properties, (2) the financial condition of the housing authority, (3) the authority's management operations, and (4) residents' satisfaction with their living conditions. HUD develops a score for each indicator and, starting in this fiscal year, plans to use the scores for all four indicators to determine whether housing authorities are troubled. So …

A letter report issued by the Government Accountability Office with an abstract that begins "Each year the federal government spends billions of dollars on information technology (IT) investments. Given the importance of oversight, the Office of Management and Budget (OMB) established a public Web site, referred to as the IT Dashboard, that provides detailed information on about 800 federal IT investments, including assessments of actual performance against cost and schedule targets (referred to as ratings). In the second of a series of Dashboard reviews, GAO was asked to (1) determine OMB's efforts to improve the Dashboard and how it is using data from the Dashboard, and (2) examine the accuracy of the Dashboard's cost and schedule performance ratings. To do so, GAO analyzed documentation on OMB oversight efforts and Dashboard improvement plans, compared the performance of 10 major investments from five agencies with large IT budgets against the ratings on the Dashboard, and interviewed OMB and agency officials."

A letter report issued by the General Accounting Office with an abstract that begins "Following a history of increasing cost estimates to complete F/A-22 development, Congress asked GAO to assess the Air Force's F/A-22 development program annually and determine whether the Air Force is meeting key performance, schedule, and cost goals. On April 23, 2003, a congressional subcommittee requested that the Department of Defense (DOD) provide more detailed information on the business case that supports the estimated quantities and costs for an affordable F/A-22 program. Specifically, GAO (1) identified changes in the F/A-22 program since its inception, (2) reviewed the status of the development activities, and (3) examined the sufficiency of business case information provided for congressional oversight."

A letter report issued by the Government Accountability Office with an abstract that begins "The U.S. Department of Housing and Urban Development (HUD) reports that it is moving forward with strategic human capital and workforce planning efforts after several years of delays. HUD's most recent workforce plan expired in 2009 and since then HUD has launched several planning efforts. According to HUD, these efforts were preempted by other important priorities, such as responding to the economic crisis. HUD undertook initiatives such as training key program office staff on the need to determine up front the staff HUD could afford to hire. In HUD's latest effort, a contractor is expected to complete human capital and workforce plans no later than fiscal year 2014. In June 2012, an Office of Personnel Management (OPM) review found that HUD's human capital and workforce planning activities did not always follow key principles for planning, implementing, and evaluating the results of human capital management policies and practices. For example, the review found that HUD's human resources policies and programs are not aligned with the organization's mission, strategic goals, or performance outcomes. As a result of these weaknesses, OPM concluded that HUD cannot continually assess and improve …

A letter report issued by the Government Accountability Office with an abstract that begins "The Internal Revenue Service (IRS) has a demanding responsibility in collecting taxes, processing tax returns, and enforcing the nation's tax laws. It relies extensively on computerized systems to support its financial and mission-related operations and on information security controls to protect financial and sensitive taxpayer information that resides on those systems. As part of its audit of IRS's fiscal years 2010 and 2009 financial statements, GAO assessed whether controls over key financial and tax processing systems are effective in ensuring the confidentiality, integrity, and availability of financial and sensitive taxpayer information. To do this, GAO examined IRS information security policies, plans, and procedures; tested controls over key financial applications; and interviewed key agency officials at four sites."

A letter report issued by the Government Accountability Office with an abstract that begins "The Joint Strike Fighter (JSF) is DOD's most expensive aircraft program. The program represents 90 percent of the remaining planned investment for recapitalizing DOD's aging tactical aircraft fleet. GAO is required by law to review the program annually for 5 years, beginning in fiscal year 2005. This is our second report and GAO assessed the program's acquisition approach--in terms of capturing knowledge for key investment decisions--and identified an alternative to improve outcomes."

A letter report issued by the Government Accountability Office with an abstract that begins "The Department of Defense (DOD) has spent nearly $90 billion since 1985 to develop a Ballistic Missile Defense System (BMDS). In the next 6 years, the Missile Defense Agency (MDA), the developer, plans to invest about $58 billion more. MDA's overall goal is to produce a system that is capable of defeating enemy missiles launched from any range during any phase of their flight. MDA's approach is to field new capabilities in 2-year blocks. The first--Block 2004--was to provide some protection by December 2005 against attacks out of North Korea and the Middle East. Congress requires GAO to assess MDA's progress annually. This year's report assesses (1) MDA's progress during fiscal year 2005 and (2) whether capabilities fielded under Block 2004 met goals. To the extent goals were not met, GAO identifies reasons for shortfalls and discusses corrective actions that should be taken."

A letter report issued by the Government Accountability Office with an abstract that begins "Billions of dollars have been spent governmentwide to modernize financial management systems that have often exceeded budgeted cost, resulted in delays in delivery dates and did not provide the anticipated system functionality when implemented. GAO was asked to identify (1) the key causes for financial management system implementation failures, and (2) the significant governmentwide initiatives currently under way that are intended to address the key causes of financial management system implementation failures. GAO was also asked to provide its views on actions that can be taken to help improve the management and control of agency financial management system modernization efforts."

A letter report issued by the Government Accountability Office with an abstract that begins "Oil and natural gas produced from federal leases generated over $6.5 billion in royalties in 2009. To verify that royalties are paid on the correct volumes of oil and gas, the Department of the Interior (Interior) verifies the quantity and quality of oil and gas, both onshore, through the Bureau of Land Management, and offshore, through the Offshore Energy and Minerals Management Service. This report assesses (1) the extent to which Interior's production verification regulations and policies provide reasonable assurance that oil and gas are accurately measured; (2) the extent to which Interior's offshore and onshore production accountability inspection programs consistently set and meet program goals and address key factors affecting measurement accuracy; and (3) Interior's management of its production verification programs. To address these questions, GAO analyzed Interior data on oil and gas inspections and human capital, as well as interviewed officials from Interior, states, oil and gas companies, and other countries."

A letter report issued by the Government Accountability Office with an abstract that begins "The Future Combat System (FCS) is central to Army transformation efforts, comprising 14 integrated weapon systems and an advanced information network. In previous work, GAO found that the elements of a sound business case--firm requirements, mature technologies, a knowledge-based acquisition strategy, a realistic cost estimate, and sufficient funding--were not present. As a result, FCS is considered high risk and in need of special oversight and review. Congress has mandated that the Department of Defense (DOD) decide in early 2009 whether FCS should continue. GAO is required to review the program annually. In this report, GAO analyzes FCS development, including its requirements definition; status of critical technologies, software development, and complementary programs; soundness of its acquisition strategy related to design, production and spin-out of capabilities to current forces; and reasonableness of costs and sufficiency of funding."

A letter report issued by the Government Accountability Office with an abstract that begins "The Air Force is preparing a modernization plan that expands the capabilities of the F/A-22, which was first designed to serve as an air-to-air fighter aircraft with very limited ability to strike targets on the ground. The Air Force now intends to transform it by adding robust air-to-ground capabilities to attack enemy ground threats and by adding onboard intelligence data gathering capabilities. After the recent budget cut, DOD estimates F/A-22 cost at $63.8 billion for 178 aircraft. It has been in development for more than 19 years, a decade longer than originally envisioned. In the face of significant cost and schedule overruns, Congress mandates that GAO annually assess the F/A-22 program. In this report, GAO addresses (1) the Air Force's business case for the F/A-22 modernization plan and (2) the recently completed initial operational test and evaluation."

A letter report issued by the Government Accountability Office with an abstract that begins "Mandated to screen all checked baggage using explosive detection systems at airports by December 31, 2003, the Transportation Security Administration (TSA) deployed two types of screening equipment: explosives detection systems (EDS), which use computer-aided tomography X-rays to recognize the characteristics of explosives, and explosives trace detection (ETD) systems, which use chemical analysis to detect traces of explosive material vapors or residues. This report assesses (1) TSA's use of budgeted funds to install EDS and ETD systems and the impact of initially deploying these systems, (2) TSA and airport actions to install EDS machines in-line with baggage conveyor systems, and the federal resources made available for this purpose, and (3) actions taken by TSA to optimally deploy checked baggage screening systems."

A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO reviewed the Commodity Futures Trading Commission's (CFTC) fiscal year 2000 annual performance plan, focusing on whether CFTC complied with the requirements of the Government Performance and Results Act of 1993."

A letter report issued by the Government Accountability Office with an abstract that begins "IRS continued to make progress in addressing information security control weaknesses, improving its internal control over financial reporting. During fiscal year 2012, IRS management devoted attention and resources to addressing information security controls, and resolved a significant number of the information security control deficiencies that GAO previously reported. Notable among these efforts were the (1) formation of cross-functional working groups tasked with the identification and remediation of specific at-risk control areas, (2) improvement in controls over the encryption of data transferred between accounting systems, and (3) upgrades to critical network devices on the agency's internal network system. However, serious weaknesses remain that could affect the confidentiality, integrity, and availability of financial and sensitive taxpayer data. For example, the agency had not always (1) implemented effective controls for identifying and authenticating users, such as enforcing password complexity on certain servers; (2) appropriately restricted access to its mainframe environment; (3) effectively monitored the mainframe environment; or (4) ensured that current patches had been installed on systems to protect against known vulnerabilities."

A letter report issued by the Government Accountability Office with an abstract that begins "The Federal Emergency Management Agency (FEMA) continues to respond to hurricanes Katrina and Rita. GAO's previous work identified suspected fraud, waste, and abuse resulting from control weaknesses associated with FEMA's Individuals and Households Program (IHP) and the Department of Homeland Security's (DHS) purchase card program. Congress asked GAO to follow up on this previous work to determine whether potentially improper and/or fraudulent payments continued to be made. GAO testified on the results of our audit and investigative efforts on December 6, 2006. This report summarizes the results of our follow-up work."

A letter report issued by the Government Accountability Office with an abstract that begins "Through 2011, the Department of Defense (DOD) plans to spend $20 billion to significantly increase its inventory of unmanned aircraft systems, which are providing new intelligence, surveillance, reconnaissance, and strike capabilities to U.S. combat forces--including those in Iraq and Afghanistan. Despite their success on the battlefield, DOD's unmanned aircraft programs have experienced cost and schedule overruns and performance shortfalls. Given the sizable planned investment in these systems, GAO was asked to review DOD's three largest unmanned aircraft programs in terms of cost. Specifically, GAO assessed the Global Hawk and Predator programs' acquisition strategies and identified lessons from these two programs that can be applied to the Joint Unmanned Combat Air Systems (J-UCAS) program, the next generation of unmanned aircraft."