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Compositional Effects on Aluminide Oxidation Performance: Objectives for Improved Bond Coats
In order to achieve long thermal barrier coating lifetimes, underlying metallic bond coats need to form adherent, slow-growing Al{sub 2}O{sub 3} layers. A set of guidelines for developing aluminide bond coat compositions is proposed in order to maximize oxidation performance, i.e. forming a slow-growing adherent alumina scale. These criteria are based on results from cast, model alloy compositions and coatings made in a laboratory-scale chemical vapor deposition facility. Aluminide coatings are thought to have more long-range potential because of their lower coefficient of thermal expansion compared to MCrAlYs. The role of Pt in improving alumina scale adhesion and countering the detrimental role of indigenous sulfur is discussed. However, the improvements associated with Pt are minimal compared to reactive element doping. One strategy which has great promise for improvement is to incorporate Hf into the coating. From an oxidation standpoint, this would preclude the need for Pt in the coating and also reduce the scale growth rate. While excellent oxidation performance was observed for cast Hf-doped NiAl, its benefits can be compromised and even eliminated by co-doping with elements such as Cr,Ti, Ta and Re. Creating a pure Hf-doped NiAl is one promising approach for improving the oxidation performance of bond …
Date:
October 22, 2001
Creator:
Pint, B. A.; Haynes, J. A.; More, K. L.; Wright, I. G. & Leyens, C.
Object Type:
Article
System:
The UNT Digital Library
Compositions, Functions, and Testing of Friction Brake Materials and Their Additives
The purpose of this report is to present a survey of commercial brake materials and additives, and to indicate their typical properties and functions, especially as regards their use in heavy trucks. Most truck pad and shoe materials described here were designed to wear against cast iron. Brake material test methods are also briefly described. This report does not address issues associated with the fabrication and manufacturing of brake materials. Since there are literally thousands of brake material additives, and their combinations are nearly limitless, it is impractical to list them all here. Rather, an attempt has been made to capture the primary constituents and their functions. An Appendix contains thermo-physical properties of some current and potential brake materials.
Date:
October 22, 2001
Creator:
Blau, PJ
Object Type:
Report
System:
The UNT Digital Library
Contract Management: Excess Payments and Underpayments Continue to Be a Problem at DOD
A letter report issued by the General Accounting Office with an abstract that begins "GAO reviewed the amount of excess payments and underpayments made by the Department of Defense (DOD) to its contractors during fiscal year 1999. The Defense Finance and Accounting Service (DFAS)--Columbus Center, Ohio reports that contractors repaid $670 million in fiscal year 1999 and closer to a billion dollars--$901 million--in fiscal year 2000. The higher amount for fiscal year 2000 reflects the inclusion of repayments made through offsets of other payments ($269 million) in addition to the amount repaid by check ($632 million). Although small in relation to total contract payments, these amounts represent a sizable amount of cash in the hands of contractors beyond what is intended to finance and pay for the goods and services DOD is purchasing. The 39 large contractors covered by GAO's review returned excess payments totaling $351 million in fiscal year 1999. Seventy-seven percent of these excess payments stemmed from contract administration actions and 18 percent stemmed from billing or payment errors. Large contractors reported resolving $41 million in underpayments during fiscal year 1999. Contractors attributed most underpayments to payment errors made by DFAS--Columbus."
Date:
February 22, 2001
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
Contract Management: Service Contracting Trends and Challenges
Correspondence issued by the General Accounting Office with an abstract that begins "GAO reviewed several issues concerning service contracting trends and challenges facing the government. The government has had long-standing difficulties in managing service contracts, and it is clear that agencies are not doing all they can to ensure that they are acquiring services that meet their needs in a timely and cost-effective manner. Agencies have begun efforts to address their strategic human capital needs; however, no agency has completed a strategic human capital management plan for their acquisition workforce. Overall, agencies' plans reflected different levels of attention to human capital, ranging from merely identifying human capital challenges to putting forward solutions to address those challenges, such as by defining actual plans, committing resources, and assigning accountability."
Date:
August 22, 2001
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
Contract Management: Small Businesses Continue to Win Construction Contracts
A letter report issued by the General Accounting Office with an abstract that begins "Congress appropriates billions of dollars annually to construct buildings and other facilities for military training and operations. Small business have carried out a significant portion of this work. Congress and small business advocates, however, had become concerned that agencies were combining requirements into larger contracts that small businesses could not win. GAO examined the contract bundling of military construction requirements. GAO determined whether (1) overall data on construction contract awards to small businesses indicated that their ability to compete for contracts had been impaired and (2) selected Department of Defense (DOD) contracting offices had combined construction requirements in ways that hampered small businesses' ability to compete. Overall data on military construction contract awards to small businesses revealed that small businesses are generally continuing to win work and that their ability to compete is not being impaired. The Small Business Administration reviewed and approved of DOD's plan to determine whether the construction work being done could accommodate smaller contractors. Small businesses were able to compete for the remaining contracts."
Date:
June 22, 2001
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
Contract Management: Trends and Challenges in Acquiring Services
Testimony issued by the General Accounting Office with an abstract that begins "Federal agencies spend billions of tax dollars each year to buy services--from clerical support to information technology assistance to the management of national laboratories. The federal government spent more than $87 billion in services--a 24 percent increase in real terms from fiscal year 1990. Some service procurements are not being done efficiently, putting taxpayer dollars at risk. In particular, agencies are not clearly defining their requirements, fully considering alternative solutions, performing vigorous price analyses, and adequately overseeing contractor performance. This testimony (1) describes service contracting trends and the changing acquisition environment, (2) discusses the challenges confronting the government in acquiring services, and (3) highlights some efforts underway to address these challenges. GAO found that purchases of services now account for about 43 percent of federal contracting expenses--the largest single spending category. The growth of services has been driven largely by the government's increased purchases of information technology services and professional, administrative, and management support services. Poor contract management has undermined the government's ability to obtain good value for the money and continues to be a major problem for the two biggest service purchasers-the Departments of Defense and Energy. …
Date:
May 22, 2001
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
Critical Infrastructure Protection: Significant Challenges in Developing Analysis, Warning, and Response Capabilities
Testimony issued by the General Accounting Office with an abstract that begins "To better protect the nation's critical computer-dependent infrastructures from computer-based attacks and disruption, the President issued a directive in 1998 that established the National Infrastructure Protection Center as a national focal point for gathering information on threats and facilitating the federal government's response to computer-based incidents. This testimony discusses the center's progress in (1) developing national capabilities for analyzing cyber threat and vulnerability data and issuing warnings, (2) enhancing its capabilities for responding to cyber attacks, and (3) developing outreach and information-sharing initiatives with government and private-sector entities. GAO found that although the center has taken some steps to develop analysis and warning capabilities, the strategic capabilities described in the presidential directive have not been achieved. By coordinating investigations and providing technical assistance the center has provided important support that has improved the Federal Bureau of Investigations' ability to investigate computer crimes. The center has also developed crisis management procedures and drafted an emergency law enforcement sector plan, which is now being reviewed by sector members. The center's information-sharing relationships are still evolving and will probably have limited effectiveness until reporting procedures and thresholds are defined and trust …
Date:
May 22, 2001
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
Daily Journal (Perry, Okla.), Vol. 108, No. 15, Ed. 1 Monday, January 22, 2001
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
January 22, 2001
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Daily Journal (Perry, Okla.), Vol. 108, No. 38, Ed. 1 Thursday, February 22, 2001
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
February 22, 2001
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Daily Journal (Perry, Okla.), Vol. 108, No. 58, Ed. 1 Thursday, March 22, 2001
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
March 22, 2001
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Daily Journal (Perry, Okla.), Vol. 108, No. 101, Ed. 1 Tuesday, May 22, 2001
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
May 22, 2001
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Daily Journal (Perry, Okla.), Vol. 108, No. 123, Ed. 1 Friday, June 22, 2001
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
June 22, 2001
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Daily Journal (Perry, Okla.), Vol. 108, No. 165, Ed. 1 Wednesday, August 22, 2001
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
August 22, 2001
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Daily Journal (Perry, Okla.), Vol. 108, No. 207, Ed. 1 Monday, October 22, 2001
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
October 22, 2001
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Dallas Voice (Dallas, Tex.), Vol. 18, No. 8, Ed. 1 Friday, June 22, 2001
Weekly newspaper from Dallas, Texas that includes local, state, and national news and advertising of interest to the Lesbian, Gay, Bisexual, and Transgender (LGBT) community.
Date:
June 22, 2001
Creator:
Vercher, Dennis
Object Type:
Newspaper
System:
The UNT Digital Library
DART begins 321 GO door-to-door service
News release about a "flexible" bus route that allows customers to schedule pick-up and drop-off spots outside the normal route.
Date:
February 22, 2001
Creator:
Lyons, Morgan
Object Type:
Text
System:
The Portal to Texas History
Defense Acquisitions: Navy and Marine Corps Pilot Program Initiatives to Reduce Total Ownership Costs
Correspondence issued by the General Accounting Office with an abstract that begins "This is the third in a series of GAO reports evaluating the military services' efforts to reduce weapons systems operating and support costs. GAO previously reported on Army and Air Force efforts. This report evaluates the Navy and Marine Corps pilot programs. GAO found that the Navy and Marine Corps have begun several efforts to reduce weapon system operating and support costs. For example, they are using an open architecture design method that reduces the cost of component replacement and changes later in system life. In addition, the Navy has other related objectives and initiatives that could significantly reduce operating and support costs. Through these and other initiatives, the Navy and Marine Corps have reported progress in reducing operating and support cost in its pilot programs."
Date:
May 22, 2001
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
Defense Budget for FY2002: An Overview of Bush Administration Plans and Key Issues for Congress
Details of Bush Administration plans for the defense budget have been on hold for several months as senior officials have undertaken a reassessment of defense policy known as the “National Defense Review.” The initial Bush budget outline, A Blueprint for New Beginnings, released on February 28, and the Administration’s official FY2002 budget request, released on April 9, include $325 billion in new budget authority for national defense in FY2002, but that total remains subject to change as the defense review proceeds. Moreover, official Administration defense budget projections beyond FY2002 simply reflect projected growth with inflation in overall annual funding for national defense fromFY2003 through FY2006 rather than the results of any policy assessment.
Date:
May 22, 2001
Creator:
Daggett, Stephen
Object Type:
Report
System:
The UNT Digital Library
Degradation and Failure Characteristics of NPP Containment Protective Coating Systems
A research program to investigate the performance and potential for debris formation of Service Level I coating systems used in nuclear power plant containment is being performed at the Savannah River Technology Center. The research activities are aligned to address phenomena important to cause coating disbondment as identified by the Industry Coatings Expert Panel. The period of interest for performance covers the time from application of the coating through 40 years of service, followed by a medium-to-large break loss-of-coolant accident scenario, which is a design basis accident (DBA) scenario. The interactive program elements are described in this report and the application of these elements to evaluate the performance of the specific coating system of Phenoline 305 epoxy-phenolic topcoat over Carbozinc 11 primer on a steel substrate. This system is one of the predominant coating systems present on steel substrates in NPP containment.
Date:
February 22, 2001
Creator:
Sindelar, R.L.
Object Type:
Report
System:
The UNT Digital Library
Department of Energy: Views on Proposed Legislation on Civil Penalties for Nuclear Safety Violations by Nonprofit Contractors
Testimony issued by the General Accounting Office with an abstract that begins "This testimony discusses GAO's views on H.R. 723, a bill that would modify the Atomic Energy Act of 1954 by changing how the Department of Energy (DOE) treats nonprofit contractors who violate DOE's nuclear safety requirements. Currently, nonprofit contractors are exempted from paying civil penalties that DOE assesses under the act. H.R. 723 would remove that exemption. GAO supports eliminating the exemption because the primary reason for instituting it no longer exists. The exemption was enacted in 1988 at the same time the civil monetary penalty was established. The purpose of the exemption was to ensure that the nonprofit contractors operating DOE laboratories who were being reimbursed only for their costs, would not have their assets at risk for violating nuclear safety requirements. However, virtually all of DOE's nonprofit contractors have an opportunity to earn a fee in addition to payments for allowable costs. This fee could be used to pay the civil monetary penalties. GAO found that DOE's nuclear safety enforcement program appears to be a useful and important tool for ensuring safe nuclear practices."
Date:
March 22, 2001
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
Department of Transportation: Status of Achieving Key Outcomes and Addressing Major Management Challenges
A letter report issued by the General Accounting Office with an abstract that begins "The Government Performance and Results Act of 1993 requires agencies to produce annual performance reports. GAO reviewed the Department of Transportation's (DOT) performance reports for fiscal years 2000 and 2002 to assess its progress in achieving selected key outcomes in important mission areas. This report (1) assesses the progress DOT has made in accomplishing these outcomes and the strategies the agency has in place to achieve them and (2) compares DOT's fiscal year 2000 performance report and fiscal year 2002 performance plan with the agency's prior year performance report and plan for these outcomes. DOT's consolidated performance report makes it clear that DOT achieved only limited progress in fiscal year 2000 toward achieving the selected outcomes and that the agency directly indicated that its current strategies are not likely to result in achievement of the goals. DOT provided a clear, well-organized discussion of performance goals, measures, and data in both fiscal year 2000 and fiscal year 2002 performance plans."
Date:
June 22, 2001
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
Depot Maintenance: Key Financial Issues for Consolidations at Pearl Harbor and Elsewhere Are Still Unresolved
A chapter report issued by the General Accounting Office with an abstract that begins "In 1998, the Navy consolidated the Pearl Harbor Naval Shipyard and the Naval Intermediate Maintenance Facility in Hawaii. Because of concerns about some aspects of the consolidation, the Navy began a test project, commonly called the Pearl Harbor pilot, to determine if integrating the management, operations, and funding of the shipyard and the intermediate maintenance facility can result in greater efficiency and lower overall ship maintenance costs. In September 1999, GAO reported that the preliminary results of the ongoing Pearl Harbor pilot were mixed and recommended that the Department of Defense (DOD) and the Navy address unresolved issues related to the financial management of the consolidation as the Navy proceeds with similar consolidations in other locations. This report updates GAO's earlier report and discusses whether (1) the Navy has provided adequate cost visibility and accountability over the consolidation, (2) DOD and the Navy have resolved other issues related to the financial structure for consolidations at Pearl Harbor and elsewhere, and (3) the consolidation has generated greater efficiency and lower costs for ship maintenance at Pearl Harbor. GAO found that the Navy still has not provided adequate …
Date:
January 22, 2001
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
Design and Construction of Deinococcus Radiodurans for Biodegradation of Organic Toxins at Radioactive DOE Waste Sites
Seventy million cubic meters of ground and three trillion liters of groundwater have been contaminated by leaking radioactive waste generated in the United States during the Cold War. A cleanup technology is being developed based on the extremely radiation resistant bacterium Deinococcus radiodurans that is being engineered to express bioremediating functions. Research aimed at developing D. radiodurans for organic toxin degradation in highly radioactive waste sites containing radionuclides, heavy metals, and toxic organic compounds was started by this group.Work funded by the existing grant has already contributed to eleven papers on the fundamental biology of D. radiodurans and its design for bioremediation of highly radioactive waste environments
Date:
April 22, 2001
Creator:
Daly, Michael J.; Wackett, Lawrence P. & Fredrickson, James K.
Object Type:
Report
System:
The UNT Digital Library
Detection of Special Operations Forces Using Night Vision Devices
Night vision devices, such image intensifiers and infrared imagers, are readily available to a host of nations, organizations, and individuals through international commerce. Once the trademark of special operations units, these devices are widely advertised to ''turn night into day''. In truth, they cannot accomplish this formidable task, but they do offer impressive enhancement of vision in limited light scenarios through electronically generated images. Image intensifiers and infrared imagers are both electronic devices for enhancing vision in the dark. However, each is based upon a totally different physical phenomenon. Image intensifiers amplify the available light energy whereas infrared imagers detect the thermal energy radiated from all objects. Because of this, each device operates from energy which is present in a different portion of the electromagnetic spectrum. This leads to differences in the ability of each device to detect and/or identify objects. This report is a compilation of the available information on both state-of-the-art image intensifiers and infrared imagers. Image intensifiers developed in the United States, as well as some foreign made image intensifiers, are discussed. Image intensifiers are categorized according to their spectral response and sensitivity using the nomenclature of GEN I, GEN II, and GEN III. As the first …
Date:
October 22, 2001
Creator:
Smith, C.M.
Object Type:
Report
System:
The UNT Digital Library