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Proceedings of the flat-plate solar array project research forum on photovoltaic metallization systems
A Photovoltaic Metallization Research Forum, under the sponsorship of the Jet Propulsion Laboratory's Flat-Plate Solar Array Project and the US Department of Energy, was held March 16-18, 1983 at Pine Mountain, Georgia. The Forum consisted of five sessions, covering (1) the current status of metallization systems, (2) system design, (3) thick-film metallization, (4) advanced techniques and (5) future metallization challenges. Twenty-three papers were presented.
Date:
November 15, 1983
Creator:
unknown
Object Type:
Article
System:
The UNT Digital Library
CONCEPTUAL DESIGN AND ECONOMIC EVALUATION OF A STEAM-COOLED FAST BREEDER REACTOR
A conceptual design and economic evaluation of 300 and 40 MW/.sub e/ steam-cooled fast breeder reactor power plants were performed. A reactor core composed of U-Pu oxide rod-type fuel elements clad with Inconel-X and surrounded by a blanket of depleted UO/sub 2/ fuel was studied in some detail. Reactor breeding ratios of from 1.27 to 1.5 and overall system doubling times of from 20 to 30 years are achievable. For the near term (1967) 300 MW/sub e/ plant, an energy cost of 7.6 mills/kwh is estimated, based on AEC ground rules for privately financed plants and utilities. This cost may go down to 5.7 mills/kwh by 1975. For the 40 MW/sub e/ plant corresponding energy costs are 19.5 and 13.7 mills/kwh, r -spectively. The R&D program required for this reactor concept is estimated at million with an additional million for improvements leading to the 1975 reactor. Investigation of the operational and safety aspects of the reactor indicated that satisfactory procedures can be used for startup, shutdown, and emergency cooling of the reactor. An increase in reactivity upon flooding can be prevented by incorprating small amounts of high resonance absorption material in the core. Preliminary calculations indicate a substantial increase in …
Date:
November 15, 1961
Creator:
Sofer, G.; Hankel, R.; Goldstein, L. & Birman, G.
Object Type:
Report
System:
The UNT Digital Library
AN ANALYSIS TO DETERMINE THE PERCENTAGE OF HELIUM BYPASSING THE CORE DUE TO THE REFLECTOR SEALING SYSTEM DURING NORMAL OPERATION OF THE HTGR
The percentage of helium which will bypass the core if the reflector system shown is used is predicted. It is estimated that nominally about 0.1 to 0.2% of the total flow will bypass the core, which is not considered excessive. The most difficult parameter to determine was Z, the gap between the sealing surfaces. The method used to predict Z is presented. The effect of bowing due to a temperature gradient across the seals is discussed. (auth)
Date:
November 15, 1961
Creator:
Nimtz, F.B.
Object Type:
Report
System:
The UNT Digital Library
VOID COEFFICIENT OF REACTIVITY ASSOCIATED WITH THE ISLAND REGION OF THE HFIR
Changes in neutron multiplication caused by voids in the island of the HFlR were calculated and measured experimentally. The results indicated that with only water initially in the island the maximum change in neutron multiplication ( DELTA k/sub max) associated with island voids is 0.032 with a corresponding void fraction of 70%. With a simulated 300 g Pu target in the island DELTA k/sub max/ was 0.0l6, and the corresponding void fraction was 42%. In view of these large changes in neutron multiplication, calculations were made to determine what additional materials could be used in the island to reduce DELTA k/sub max/ and what the associated decrease in peak thermal flux wouId be. The results indicated that of the materials considered the use of beryllium in the water island resulted in the smallest decrease in flux for a specified DELTA k/sub max/. To reduce DELTA k/sub max/ to 0.01 required 26% by volume of beryllium in the island; the corresponding reduction in thermal flux, as compared to an all-water island, was about 10%. In order to reduce DELTA k/sub max/ to 0.0l with a 300 g Pu target in the island, the aIuminum-to-water ratio of the target had to be …
Date:
November 15, 1961
Creator:
Cheverton, R.D.
Object Type:
Report
System:
The UNT Digital Library
Analysis of Vanadium in Milk Powder by Neutron Activation Analysis Using a Rapid Radiochemical Separation of 3.77-Minute Vanadium-52
A procedure is described for the activation determination of V in powdered milk using 3.77-min V/sup 52/. The quantity of V in the sample is obtained by comparing the V/sup 52/ radioactivity found in the test sample with the V/sup 52/ radioactivity in a V comparator sample that is treated in the same manner as the test sample. The procedure can also be used for the determination of V in a variety of materials. (P.C.H.)
Date:
November 15, 1963
Creator:
Molinski, V. J.; Wahl, W. H. & Strain, W. H.
Object Type:
Article
System:
The UNT Digital Library
Simulated seismic event release fraction data: Progress report, April 1986-April 1987
The object of this project is to obtain experimental data on the release of airborne particles during seismic events involving plutonium handling facilities. In particular, cans containing plutonium oxide powder may be involved and some of the powder may become airborne. No release fraction data for such scenarios are available and risk assessment calculations for such events lacked specificity describing the physical processes involved. This study has provided initial data based on wind tunnel tests simulating the impact of the debris on simulated cans of plutonium oxide powder. The release fractions are orders of magnitude smaller than previously available estimates. 8 refs., 3 figs., 2 tabs.
Date:
November 15, 1987
Creator:
Langer, G. & Deitesfeld, C. A.
Object Type:
Report
System:
The UNT Digital Library
Corrosion Associated With Hydrofluorination in the Oak Ridge National Laboratory Fluoride Volatility Process
Studies carried out on corrosion associated with the hydrofluorination- dissolution phase in the fused-salt Fluoride Volatility Process are summarized. Corrosion for hydrofluorination-dissolver vessels used in bench-scale and semiworks-scale process development at ORNL is discussed. The results of a study on construction materials for the dissolution phase are presented. Corrosion studies at ANL are described for comparison purposes. A full-size hydrofluorinator dissolver is described. (M.C.G.)
Date:
November 15, 1961
Creator:
Goldman, A. E. & Litman, A. P.
Object Type:
Report
System:
The UNT Digital Library
Synthetic fuel aromaticity and staged combustion
Samples of middle and heavy SRC-II distillates were distilled into 50 C boiling point range fractions. These were characterized by measurements of their molecular weight, elemental analysis and basic nitrogen content and calculation of average molecular structures. The structures typically consisted of 1 to 3 aromatic rings fused to alicyclic rings with short, 1 to 3 carbon aliphatic side chains. The lower boiling fractions contained significant amounts (1 atom/molecule) of oxygen while the heavier fractions contained so few heteroatoms that they were essentially hydrocarbons. Laboratory scale oxidative-pyrolysis experiments were carried out at pyrolysis temperatures of 500 to 1100 C and oxygen concentrations from 0 to 100 percent of stoichiometry. Analysis of liquid products, collected in condensers cooled with liquid nitrogen showed that aromatization is a major reaction in the absence of oxygen. The oxygen-containing materials (phenolics) seem to be more resistant to thermal pyrolysis than unsubstituted aromatics. Nitrogen converts from basic to nonbasic forms at about 500 C. The nonbasic nitrogen is more stable and survives up to 700 C after which it is slowly removed. A recently constructed 50,000 Btu/hr staged combustor was used to study the chemistry of the nitrogen and aromatics. SRC II combustion was studied under …
Date:
November 15, 1982
Creator:
Longanbach, J. R.; Chan, L. K. & Levy, A.
Object Type:
Report
System:
The UNT Digital Library
LIMB Demonstration Project Extension
The basic goal of the Limestone Injection Mitigation Burner (LIMB) demonstration is to extend LIMB technology development to a full- scale application on a representative wall-fired utility boiler. The successful retrofit of LIMB to an existing boiler is expected to demonstrate that (a) reductions of 50 percent or greater in SO{sub x} and NO{sub x} emissions can be achieved at a fraction of the cost of add-on FGD systems, (b) boiler reliability, operability, and steam production can be maintained at levels existing prior to LIMB retrofit, and (c) technical difficulties attributable to LIMB operation, such as additional slagging and fouling, changes in ash disposal requirements, and an increased particulate load, can be resolved in a cost-effective manner. The primary fuel to be used will be an Ohio bituminous coal having a nominal sulfur content of 3 percent or greater.
Date:
November 15, 1989
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Tandem mirror reactor
A parametric analysis and a preliminary conceptual design for a 1000 MWe Tandem Mirror Reactor (TMR) are described. The concept is sufficiently attractive to encourage further work, both for a pure fusion TMR and a low technology TMR Fusion-Fission Hybrid.
Date:
November 15, 1977
Creator:
Moir, R.W.; Barr, W.L. & Carlson, G.A.
Object Type:
Article
System:
The UNT Digital Library
Chemical Facility Security: Issues and Options for the 113th Congress
This report provides a brief overview of the existing statutory authority and implementing regulation. It describes several policy issues raised in previous debates regarding chemical facility security and identifies policy options for congressional consideration.
Date:
November 15, 2013
Creator:
Shea, Dana A.
Object Type:
Report
System:
The UNT Digital Library
The Presidential Records Act: Background and Recent Issues for Congress
Report discussing the Presidential Records Act (PRA) and examines policy options related to the capture, maintenance, and use of presidential records.
Date:
November 15, 2012
Creator:
Ginsberg, Wendy
Object Type:
Report
System:
The UNT Digital Library
EPA Standards for Greenhouse Gas Emissions from Power Plants: Many Questions, Some Answers
This report discusses the Environmental Protection Agency (EPA), and the New Source Performance Standards (NSPS) proposals for electric generating units (EGU) Greenhouse Gas Emissions.
Date:
November 15, 2013
Creator:
McCarthy, James E.
Object Type:
Report
System:
The UNT Digital Library
Hydraulic Fracturing: Selected Legal Issues
This report focuses on selected legal issues related to the use of hydraulic fracturing. It examines some of the requirements for hydraulic fracturing contained in major federal environmental laws. It also provides an overview of issues involving state preemption of local zoning authority, as well as state tort law.
Date:
November 15, 2013
Creator:
Vann, Adam; Murrill, Brandon J. & Tiemann, Mary
Object Type:
Report
System:
The UNT Digital Library
Guam: U.S. Defense Deployments
This report discusses the strategic significance of Guam for defense buildup and the force relocation and deployments from the U.S. mainland. It also discusses the concerns and issues for Congress, such as allies and partner, China, and legislation.
Date:
November 15, 2013
Creator:
Kan, Shirley A.
Object Type:
Report
System:
The UNT Digital Library
Nigeria: Current Issues and U.S. Policy
This report covers the recent 2011 Nigerian elections, development challenges, reform initiatives, social issues, security concerns, and international relations in Nigeria. It ends with some concerns for Congress, including U.S.-Nigerian trade issues, Nigerian counter-terrorism efforts, and U.S. assistance to Nigeria.
Date:
November 15, 2013
Creator:
Ploch, Lauren
Object Type:
Report
System:
The UNT Digital Library
USDA Conservation Programs: Stakeholder Views on Participation and Coordination to Benefit Threatened and Endangered Species and Their Habitats
A letter report issued by the Government Accountability Office with an abstract that begins "Authorization for several conservation programs administered by the U.S. Department of Agriculture (USDA) expires in 2007, raising questions about how these programs may be modified, including how they can better support conservation of threatened and endangered species. Private landowners receive funding under these programs to implement conservation projects directed at several resource concerns, including threatened and endangered species. In this report, GAO discusses (1) stakeholder views on the incentives and disincentives to participating in USDA programs for the benefit of threatened and endangered species and their suggestions for addressing identified disincentives and (2) coordination efforts by USDA and the U.S. Fish and Wildlife Service (FWS) to benefit threatened and endangered species. In performing this work, GAO conducted telephone surveys with a nonprobability sample of over 150 federal and nonfederal officials and landowners."
Date:
November 15, 2006
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
DHS Financial Management: Continued Effort Needed to Address Internal Control and System Challenges
Testimony issued by the Government Accountability Office with an abstract that begins "GAO reported that the Department of Homeland Security (DHS) had made considerable progress toward obtaining a clean opinion on its financial statements. For example, DHS reduced the number of audit qualifications from 11 in 2005 to 1 in 2010. DHS is working to resolve the deficiencies in the U.S. Coast Guard's (USCG) ability to complete certain reconciliations and provide evidence supporting certain components of general property, plant, and equipment and heritage and stewardship assets that caused DHS's auditors to issue a qualified opinion on its fiscal year 2012 financial statements. DHS has a goal of achieving a clean opinion for fiscal year 2013. However, the DHS auditors' report for fiscal year 2012, the most recently completed audit, indicated that DHS continues to rely on compensating controls and complex manual work-arounds to support its financial reporting, rather than sound internal control and effective financial management systems."
Date:
November 15, 2013
Creator:
United States. Government Accountability Office.
Object Type:
Text
System:
The UNT Digital Library
OPM Retirement Modernization: Longstanding Information Technology Management Weaknesses Need to Be Addressed
Testimony issued by the Government Accountability Office with an abstract that begins "The Office of Personnel Management (OPM) is the central human resources agency for the federal government and, as such, is tasked with ensuring the government has an effective civilian workforce. As part of its mission, OPM defines recruiting and hiring processes and procedures; provides federal employees with various benefits, such as health benefits; and administers the retirement program for federal employees. The use of information technology (IT) is crucial in helping OPM to carry out its responsibilities, and in fiscal year 2011 the agency invested $79 million in IT systems and services. For over 2 decades, OPM has been attempting to modernize its federal employee retirement process by automating paper-based processes and replacing antiquated information systems. However, these efforts have been unsuccessful, and OPM canceled its most recent retirement modernization effort in February 2011. GAO was asked to provide a statement summarizing its work on challenges OPM has faced in managing its efforts to modernize federal employee retirement processing. To do this, GAO relied on previously published work as well as a limited review of more recent documentation on OPM's retirement modernization activities."
Date:
November 15, 2011
Creator:
United States. Government Accountability Office.
Object Type:
Text
System:
The UNT Digital Library
Internal Revenue Service: Procedural Changes Could Enhance Tax Collections
A letter report issued by the Government Accountability Office with an abstract that begins "GAO previously testified that federal contractors abused the tax system with little consequence. While performing those audits, GAO noted that the Internal Revenue Service (IRS) records sometimes contained inaccurate or outdated tax information that prevented IRS from taking appropriate collection actions against those contractors, including submitting their tax debt to the Federal Payment Levy Program (FPLP) for collection. As a result, GAO was asked to review IRS's coding of tax debt excluded from the FPLP to determine whether (1) IRS tax records contain inaccurate status or transaction codes that exclude tax debt from the FPLP, (2) IRS's monitoring could be strengthened to ensure the accuracy of its status and transaction codes, and (3) other opportunities exist to increase the amount of tax debt included in the FPLP."
Date:
November 15, 2006
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
Financial Audit: Federal Housing Finance Agency's Fiscal Years 2010 and 2009 Financial Statements
A letter report issued by the Government Accountability Office with an abstract that begins "The Housing and Economic Recovery Act of 2008 (HERA) created the Federal Housing Finance Agency (FHFA) and gave it responsibility for, among other things, the supervision and oversight of the housing-related government-sponsored enterprises (GSE): Fannie Mae, Freddie Mac, and the 12 federal home loan banks. Specifically, FHFA was assigned responsibility for ensuring that each of the regulated entities operates in a fiscally safe and sound manner, including maintenance of adequate capital and internal controls, and carries out its housing and community development finance mission. HERA also requires FHFA to annually prepare financial statements, and further requires GAO to audit these statements. Pursuant to HERA's requirement, GAO audited FHFA's fiscal years 2010 and 2009 financial statements to determine whether (1) the financial statements were fairly stated, and (2) FHFA management maintained effective internal control over financial reporting. GAO also tested FHFA's compliance with selected laws and regulations. GAO is not making any recommendations in this report. In commenting on a draft of this report, FHFA stated that it was pleased with the results of the audit, and it would continue to work to enhance its internal controls …
Date:
November 15, 2010
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
Fighter Aircraft: Better Cost Estimates Needed for Extending the Service Life of Selected F-16s and F/A-18s
A letter report issued by the Government Accountability Office with an abstract that begins "The Air Force plans to upgrade and extend the service life of 300 F-16 aircraft and the Navy 150 F/A-18 aircraft, at a combined cost estimated at almost $5 billion in fiscal year 2013 dollars."
Date:
November 15, 2012
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
Centers for Medicare and Medicaid Services: Internal Control Deficiencies Resulted in Millions of Dollars of Questionable Contract Payments
A letter report issued by the Government Accountability Office with an abstract that begins "The Medicare Prescription Drug, Improvement, and Modernization Act of 2003 (MMA) established a voluntary outpatient prescription drug benefit, which is administered by the Centers for Medicare and Medicaid Services (CMS). CMS relies extensively on contractors to help it carry out its basic mission. Congress appropriated to CMS $1 billion for start-up administrative costs to implement provisions of MMA. Because CMS had discretion on how to use the appropriation, Congress asked GAO to determine (1) how CMS used the $1 billion MMA appropriation, (2) whether CMS's contracting practices and related internal controls were adequate to avoid waste and to prevent or detect improper payments, and (3) whether payments to contractors were properly supported as a valid use of government funds. To address objectives two and three above, our review extended beyond contract amounts paid with MMA funds."
Date:
November 15, 2007
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
Drug Control: Agencies Need to Plan for Likely Declines in Drug Interdiction Assets, and Develop Better Performance Measures for Transit Zone Operations
A letter report issued by the Government Accountability Office with an abstract that begins "One of the U.S. National Drug Control Strategy's priorities is to disrupt the illicit drug market. To this end, the Departments of Defense and Homeland Security provide ships and aircraft to disrupt the flow of illicit drugs, primarily cocaine, shipped from South America through the Caribbean Sea and eastern Pacific Ocean--an area known as the transit zone. The Office of National Drug Control Policy (ONDCP) oversees the U.S. anti-drug strategy. The Joint Interagency Task Force-South (JIATF-South) directs most transit zone operations. We examined U.S. efforts to interdict maritime movements of cocaine. We analyzed the (1) changes in cocaine seizures and disruptions since calendar year 2000, (2) trends in interdiction assets provided since fiscal year 2000, (3) challenges to maintaining transit zone interdiction operations, and (4) performance measures the agencies use to assess their progress."
Date:
November 15, 2005
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library