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WELDING AND BRAZING OF HIGH-TEMPERATURE RADIATORS AND HEAT EXCHANGERS
Procedures were developed for fabricating highperformance radiators and heat exchangers for the Aircraft Nuclear Propulsion (ANP) Program. These components, which contain multitudes of tube-to-tube sheet and tube-to-fin joints, are similar in design to those under consideration for a variety of space vehicle applications. In order to ensure reliability of the tube-to-tube sheet joints, techniques producing welds of extremely high quality were used and back brazing of the welds with a suitable alloy was incorporated. High-temperature brazing was also incorporated to attach high-conductivity fins to Inconel tubes in the radiators. The selection of a suitable brazing alloy for these applications was dependent upon several factors, including corrosion and oxidation resistance, flow point, and mechanical properties. A Ni- Si-B alloy was found to be adequate from all these considerations. Special brazing procedures were developed to obtain satisfactory flowability of this brazing alloy on tube-to-fin joints. The suitability of these fabrication procedures for the very stringent service conditions to which the radiators and heat exchangers were subjected was demonstrated by testing full-size components under operating conditions. (auth)
Date:
February 20, 1962
Creator:
Slaughter, G.M. & Patriarca, P.
Object Type:
Report
System:
The UNT Digital Library
Temporal perspective on acid deposition research
This statement presented to the Subcommittee on Natural Resources of the US House of Representatives gives a definition of acid rain, presents new data on the regional and temporal nature of the problem, and discusses research needs. (ACR)
Date:
February 20, 1980
Creator:
Hendrey, George R.
Object Type:
Report
System:
The UNT Digital Library
Collector sealants and breathing. Final Report, 25 September 1978-31 December 1979
The objectives of this program were: (1) to investigate the pertinent properties of a variety of possible sealants for solar collectors and identify the most promising candidates, and (2) to study the effect of breathing in flat-plate, thermal solar collector units. The study involved two types of sealants, Class PS which includes preformed seals or gaskets and Class SC which includes sealing compounds or caulks. It was the intent of the study to obtain data regarding initial properties of candidate elastomers from manufacturers and from the technical literature and to use those sources to provide data pertaining to endurance of these materials under environmental service conditions. Where necessary, these data were augmented by experimental measurements. Environmental stresses evaluated by these measurements included elevated temperatures, moisture, ultraviolet light, ozone and oxygen, and fungus. The second major area of the work involved a study of the effects of materials used and design on the durability of solar collectors. Factors such as design, fabrication, materials of construction, seals and sealing techniques and absorber plate coatings were observed on actual field units removed from service. Such phenomena as leakage, corrosion and formation of deposits on glazing and absorber plate were noted. An evaluation of …
Date:
February 20, 1980
Creator:
Mendelsohn, M A; Luck, R M; Yeoman, F A & Navish, Jr, F W
Object Type:
Report
System:
The UNT Digital Library
Development of marketable solar assisted heat pumps. Phase II. Summary report, technical results
A water source heat pump has been designed that is capable of operating over the range from 40 to 110/sup 0/F entering water temperature and has a heating coefficient of performance greater than six in the upper portion of this range. A computerized heat pump balance program was written to allow the performance of either a water-to-water or a water-to-air heat pump to be predicted in either the heating or cooling mode. A detailed program description, flow charts, and sample outputs are appended. The balance program was used to specify components for a high efficiency water-to-water and a high efficiency water-to-air heat pump. Performance predictions for both units in heating and in cooling are included. The water-to-water and water-to-air performance predictions were compared. The water-to-air approach was clearly superior. A detailed design and layout was done for the three solar-assisted water-to-air heat pump. A horizontal configuration was chosen for marketability reasons. The design was made consistent with high quantity production equipment available in our factories and should result in the lowest possible manufacturing cost. A key question to be answered in this project is whether a reciprocating compressor can operate without damage at the high suction pressures characteristic to the …
Date:
February 20, 1981
Creator:
Hundt, R. & Heard, S.
Object Type:
Report
System:
The UNT Digital Library
Simulation program for central helium liquefier
The computer program described here analyzes the performance of Fermilab Central Helium Liquefier (CHL) and predicts the values of the plant thermodynamic variables at all process points in the plant. To simulate CHL, this program is modified from the prototype program which was developed by Hitachi Ltd. a couple of years ago. This program takes care of only the steady state simulation and takes account of the change of the turbine efficiency, the pressure drops and the UA values of the heat exchangers. How to use the program is shown.
Date:
February 20, 1984
Creator:
Kawamura, S.
Object Type:
Report
System:
The UNT Digital Library
Armenia, Azerbaijan, and Georgia: Political Developments and Implications for U.S. Interests
This report discusses the history and political background of Armenia, Azerbaijan, and Georgia since their breakaway from the former Soviet Union at the end of 1991. It looks at key issues for the 112th Congress including economies, energy, regional politics, local crime, and terrorism.
Date:
February 20, 2014
Creator:
Nichol, Jim
Object Type:
Report
System:
The UNT Digital Library
Gangs in Central America
This report describes the gang problem in Central America, discusses country approaches to deal with the gangs, and analyzes U.S. policy with respect to gangs in Central America.
Date:
February 20, 2014
Creator:
Seelke, Clare Ribando
Object Type:
Report
System:
The UNT Digital Library
PILT (Payments in Lieu of Taxes): Somewhat Simplified
This report explains Payments in Lieu of Taxes (PILT), with an analysis of the five major factors affecting the calculation of a payment to a given county. It also describes the effects of certain legislative changes to PILT in 2009 and 2012.
Date:
February 20, 2014
Creator:
Corn, M. Lynne
Object Type:
Report
System:
The UNT Digital Library
U.S. Manufacturing in International Perspective
This report contains a series of charts and tables that depict the position of manufacturing in the United States relative to other countries according to various metrics.
Date:
February 20, 2014
Creator:
Levinson, Marc
Object Type:
Report
System:
The UNT Digital Library
Employment for Veterans: Trends and Programs
This report discusses veterans' employment trends and programs. The first section presents data on veterans' employment outcomes, identifying recent trends, and discussing issues to consider when interpreting veterans' employment data. The following sections present brief discussions of existing programs that provide employment-related services to veterans. These services are divided into (1) general programs that are broadly available to veterans, (2) programs that target veterans with service-connected disabilities, and (3) competitive grant programs that provide additional employment-related services to veterans but may be limited in scope or availability.
Date:
February 20, 2014
Creator:
Collins, Benjamin; Dilger, Robert Jay; Dortch, Cassandria; Kapp, Lawrence; Lowry, Sean & Perl, Libby
Object Type:
Report
System:
The UNT Digital Library
Japan-U.S. Relations: Issues for Congress
This report discusses issues regarding U.S.-Japan economic relations, since the economic condition of each nation can affect the world economy and a U.S.-Japan bilateral economic relationship could influence economic conditions in other countries. U.S. and Japanese leaders have several options on how to manage their relationship, including stronger reliance on the World Trade Organization; special bilateral negotiating frameworks and agreements; or a free trade agreement.
Date:
February 20, 2014
Creator:
Chanlett-Avery, Emma; Cooper, William H.; Manyin, Mark E. & Rinehart, Ian E.
Object Type:
Report
System:
The UNT Digital Library
EPA Regulation of Greenhouse Gases: Congressional Responses and Options
This report discusses elements of the greenhouse gas (GHG) controversy, providing background on stationary sources of GHG pollution and identifying options Congress has at its disposal to address GHG issues, including: (1) resolutions of disapproval under the Congressional Review Act; (2) freestanding legislation; (3) the use of appropriations bills as a vehicle to influence EPA activity; and (4) amendments to the Clean Air Act, including legislation to establish a new GHG control regime.
Date:
February 20, 2014
Creator:
McCarthy, James E.
Object Type:
Report
System:
The UNT Digital Library
Federally Chartered Corporation: Review of the Financial Statement Audit Reports for the Military Order of the Purple Heart of the United States of America, Inc., for Fiscal Years 1997-2000
Correspondence issued by the General Accounting Office with an abstract that begins "GAO reviewed the financial statement audit reports for the Military Order of the Purple Heart of the United States of America, Inc., for fiscal years ended 2000, 1999, 1998, and 1997. GAO found no reportable instances of noncompliance with the requirements of the law, and the audit reports included the auditors' opinions that the corporation's financial statements were presented fairly in accordance with generally accepted accounting principles."
Date:
February 20, 2001
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
State Children's Health Insurance Program: CMS Should Improve Efforts to Assess whether SCHIP Is Substituting for Private Insurance
A letter report issued by the Government Accountability Office with an abstract that begins "Congress created the State Children's Health Insurance Program (SCHIP) to reduce the number of uninsured children in low-income families that do not qualify for Medicaid. States have flexibility in structuring their SCHIP programs, and their income eligibility limits vary. Concerns have been raised that individuals might substitute SCHIP for private health insurance--known as crowd-out. GAO was asked to examine the Centers for Medicare & Medicaid Services' (CMS) and states' efforts to minimize crowd-out and determine whether it should be a concern. GAO examined (1) CMS's guidance to states for minimizing crowd-out and assessment of whether it should be a concern and (2) states' policies to minimize crowd-out and how they assess whether it should be a concern. To do the work, GAO reviewed federal laws and guidance, examined state annual reports, and interviewed CMS officials. GAO also interviewed SCHIP officials from nine states."
Date:
February 20, 2009
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
Defense Acquisitions: Readiness of the Marine Corps' V-22 Aircraft for Full-Rate Production
Correspondence issued by the General Accounting Office with an abstract that begins "GAO concludes that the V-22 program is not ready for full-rate production. This conclusion is based on two factors. First, GAO's "best practices" work has identified practices used by successful commercial and defense programs to develop and produce quality products in significantly less time and at lower costs. GAO reviews of major weapons systems have shown that failure to follow these practices results in cost increases, schedule delays, and performance problems. Second, GAO analyzed Department of Defense (DOD) assessments and data on the V-22 program and interviewed DOD officials. As a result of GAO's findings, DOD postponed the full-rate production of the V-22 aircraft until the risks have been mitigated."
Date:
February 20, 2001
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
Foreign Assistance: USAID and the Department of State Are Beginning to Implement Prohibition on Taxation of Aid
Correspondence issued by the General Accounting Office with an abstract that begins "In 2002, Congress learned that the Palestinian Authority had collected $6.8 million in taxes on U.S. humanitarian assistance meant for the people of the West Bank and Gaza and subsequently learned that some other foreign governments were also taxing U.S. assistance. U.S. Agency for International Development (USAID) officials estimate that at least several million dollars in taxes are collected annually on U.S. assistance programs, although some of this amount is reimbursed by recipient governments. This situation raised concerns in Congress that U.S. assistance funds for programs to help developing country populations were instead being diverted to the treasuries of foreign governments. In response to these concerns, Congress included a prohibition against such taxation in its Consolidated Appropriations Resolution for fiscal year 2003, and provided for a 200 percent penalty for taxes levied but not reimbursed. This legislation defines "taxes" and "taxation" as value added taxes (VAT) and customs duties imposed on commodities financed with U.S. assistance for programs for which funds are appropriated by the act. This report responds to a requirement in that legislation that we report to the committees on appropriations concerning these provisions. In discussions …
Date:
February 20, 2004
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
Defense Management: Actions Needed to Address Stakeholder Concerns, Improve Interagency Collaboration, and Determine Full Costs Associated with the U.S. Africa Command
A letter report issued by the Government Accountability Office with an abstract that begins "In February 2007, the President directed the Department of Defense (DOD) to establish the U.S. Africa Command (AFRICOM) to help strengthen U.S. security cooperation with African nations and bring peace and stability to the continent. For this review, GAO assessed DOD's (1) efforts to establish the command and communicate its mission, (2) progress in integrating personnel from other U.S. government agencies into AFRICOM, and (3) plans and costs for establishing a permanent headquarters and supporting offices in Africa. In assessing DOD's efforts to establish AFRICOM, GAO analyzed relevant documentation and obtained perspectives from the combatant commands, military services, Office of the Secretary of Defense, Department of State (State), U. S. Agency for International Development, and nongovernmental organizations."
Date:
February 20, 2009
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
Federally Chartered Corporation: Review of the Financial Statement Audit Reports for the American Council of Learned Societies for Fiscal Years 1997-1999
Correspondence issued by the General Accounting Office with an abstract that begins "GAO reviewed the American Council of Learned Societies' financial statement audit reports to determine whether it complied with the financial reporting requirements of the law. GAO found no reportable instances of noncompliance, and the audit reports included the auditors' opinions that the financial statements of the corporation were presented fairly in accordance with generally accepted accounting principles."
Date:
February 20, 2001
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
Government Printing Office: Issues Faced in Obtaining a New Facility
Correspondence issued by the Government Accountability Office with an abstract that begins "The Government Printing Office (GPO), within the legislative branch, is the federal government's primary resource for gathering, producing, and preserving published federal information. GPO's main facility --located 5 blocks from the U.S. Capitol--encompasses about 1.5 million square feet and consists of four buildings that range in age from 68 to 105 years. According to GPO officials, the facility is inefficiently configured, aging, and much larger than needed. As a result, GPO has examined several options for obtaining a new facility. In 1982, GAO recommended that GPO conduct a cost-benefit analysis of the various options available to address the inefficiencies in its facilities. GAO was asked to examine GPO's efforts to obtain a new facility. Accordingly, this briefing provides preliminary information on (1) GPO's analysis of options to obtain a new facility and the extent to which GPO has followed leading practices for capital decision-making and (2) issues, if any, that impede GPO's efforts to obtain a new facility. To conduct this work, GAO analyzed GPO studies and interviewed GPO and District government officials, among others. GPO officials reviewed a draft of this briefing and generally agreed with the …
Date:
February 20, 2009
Creator:
United States. Government Accountability Office.
Object Type:
Text
System:
The UNT Digital Library
Defense Management: DOD Needs to Increase Attention on Fuel Demand Management at Forward-Deployed Locations
A letter report issued by the Government Accountability Office with an abstract that begins "The Department of Defense (DOD) relies heavily on petroleum-based fuel to sustain its forward-deployed locations--particularly those that are not connected to local power grids. While weapon platforms require large amounts of fuel, DOD reports that the single largest battlefield fuel consumer is generators, which provide power for base support activities such as cooling, heating, and lighting. Transporting fuel to forward-deployed locations presents an enormous logistics burden and risk, including exposing fuel truck convoys to attack. GAO was asked to address DOD's (1) efforts to reduce fuel demand at forward-deployed locations and (2) approach to managing fuel demand at these locations. This review focused on locations within Central Command's area of responsibility. GAO visited DOD locations in Kuwait and Djibouti to learn about fuel reduction efforts and challenges facing these locations."
Date:
February 20, 2009
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
Nonprescription Drugs: Considerations Regarding a Behind-the-Counter Drug Class
A letter report issued by the Government Accountability Office with an abstract that begins "In the United States, most nonprescription drugs are available over-the-counter (OTC) in pharmacies and other stores. Experts have suggested that drug availability could be increased by establishing an additional class of nonprescription drugs that would be held behind the counter (BTC) but would require the intervention of a pharmacist before being dispensed; a similar class of drugs exists in many other countries. Although the Food and Drug Administration (FDA) has not developed a detailed proposal for a BTC drug class, it held a public meeting in 2007 to explore the public health implications of BTC drug availability. GAO was asked to update its 1995 report, Nonprescription Drugs: Value of a Pharmacist-Controlled Class Has Yet to Be Demonstrated (GAO/PEMD-95-12). Specifically, GAO is reporting on (1) arguments supporting and opposing a U.S. BTC drug class, (2) changes in drug availability in five countries since 1995 and the impact of restricted nonprescription classes on availability, and (3) issues important to the establishment of a BTC drug class. GAO reviewed documents and consulted with pharmaceutical experts. To examine drug availability across countries, GAO studied five countries it had reported on …
Date:
February 20, 2009
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
Federally Chartered Corporation: Review of the Financial Statement Audit Reports for The American Society of International Law for 1997-1999
Correspondence issued by the General Accounting Office with an abstract that begins "GAO reviewed the American Society of International Law's financial statement audit reports to determine whether it complied with the financial reporting requirements of the law. GAO found no reportable instances of noncompliance, and the audit report included the auditors' opinions that the corporation's financial statements were presented fairly in accordance with generally accepted accounting principles."
Date:
February 20, 2001
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
Senate Office of Public Records Revolving Fund Review Procedures
Correspondence issued by the General Accounting Office with an abstract that begins "GAO reviewed whether the Senate Office of Public Records revolving fund's reported fiscal year (FY) 2000 receipts and disbursements and fund balances at the beginning and end of the review period were complete and accurate. GAO found that FY 2000 cash receipts for the Senate Office of Public Records were supported by appropriate documentation and were accurately recorded, summarized, and reported in the Senate Disbursement Office's monthly Statement of Funding Authorization and Expense Activity reports. GAO also found an undocumented gap in the prenumbered official receipt documents. The Senate Office of Public Records explained that the gap resulted from replacing missing receipt stock with receipt stock that began with a different sequential number. GAO confirmed that even though official receipt stock was missing, it was never used to support FY 2000 cash receipts. GAO also found that all FY 2000 cash disbursements from the Senate Office of Public Records revolving fund were certified, authorized, and sanctioned prior to payment. Finally, GAO found that the Office had not routinely done reconciliations between its records and those of the Senate Disbursement Office."
Date:
February 20, 2001
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
Investigations of Terrorist Financing, Money Laundering, and Other Financial Crimes
Correspondence issued by the General Accounting Office with an abstract that begins "After the tragic events of September 11, 2001, federal efforts to wage a seamless, coordinated campaign against sources of terrorist financing became critically important. In May 2003, the Attorney General and the Secretary of Homeland Security signed a Memorandum of Agreement (Agreement) concerning terrorist financing investigations, which contained a number of provisions designed to resolve jurisdictional issues and enhance interagency coordination. The Agreement and its related procedures specified that the Federal Bureau of Investigation (FBI) was to have the lead role in investigating terrorist financing and that the U.S. Immigration and Customs Enforcement (ICE), a component of the Department of Homeland Security, was to pursue terrorist financing solely through participation in FBI-led task forces, except as expressly approved by the FBI. Specific provisions of the Agreement directed the FBI and ICE to, among other things, develop collaborative procedures for handling applicable ICE investigations or financial crimes leads that have a nexus to terrorism. Another provision required that the FBI and ICE jointly report to the Attorney General, the Secretary of Homeland Security, and the Assistant to the President for Homeland Security on the status of the implementation of …
Date:
February 20, 2004
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library