Partner
UNT Libraries Government Documents Department
8,899
UNT Libraries Special Collections
1,436
Oklahoma Historical Society
1,178
UNT Libraries
597
National Museum of the Pacific War/Admiral Nimitz Foundation
310
Sterling Municipal Library
294
Carl Albert Congressional Research and Studies Center
212
UNT Music Library
160
UNT Honors College
116
San Antonio Public Library
102
114 More
Collection
Office of Scientific & Technical Information Technical Reports
5,274
Texas Digital Newspaper Program
3,231
Congressional Research Service Reports
1,828
Oklahoma Digital Newspaper Program
1,444
Tocker Foundation Grant
1,323
Government Accountability Office Reports
903
Texas Laws and Resolutions Archive
376
The Greensheet
364
University Photography Collection
349
Photographing UNT
348
203 More
Degree Department
Degree Discipline
Degree Level
Country
States
Decade
Year
Month
Language
16,032 Matching Results
Results open in a new window/tab.
Chromosome damage in respiratory tract: dosimetry and cancer [Radon Program; Microbeam instrument]
None
Date:
April 1, 2000
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Cle Elum Lake Anadromous Salmon Restoration Feasibility Study: Summary of Research, 1986-1999 Progress Report.
The focus of this research was to study the feasibility for anadromous salmonids to recolonize the habitat above reservoirs in the Yakima River without disruption to irrigation withdrawals. A primary concern was whether anadromous fish could successfully exit reservoirs and survive downstream passage through the Yakima and Columbia Rivers to the ocean.
Date:
April 1, 2000
Creator:
Dey, Douglas
Object Type:
Report
System:
The UNT Digital Library
Closed Loop Biomass Co-Firing
None
Date:
April 1, 2000
Creator:
Jakeway, Lee & Nakahata, Mae
Object Type:
Report
System:
The UNT Digital Library
Closure Report for Corrective Action Unit 342: Area 23 Mercury Fire Training Pit Nevada Test Site, Nevada
The purpose of this Closure Report (CR) is to provide documentation of the completed corrective action and to provide data confirming the corrective action. The corrective action was performed following the approved Corrective Action Plan (CAP) (U.S. Department of Energy [DOE], 1999b) and consisted of closure-in-place with partial excavation, disposal, backfilling, administrative controls, and post-closure monitoring. Soil with petroleum hydrocarbon concentrations above the Nevada Division of Environmental Protection (NDEP) Action Level of 100 milligrams per kilogram (mg/kg) (Nevada Administrative Code, 1996) was removed to a depth of 1.5 meters (m) (5 feet [ft]). The excavations were backfilled with clean fill to restore the site and to prevent contact with deeper, closed-in-place soil that exceeded the NDEP Action Level. According to the Corrective Action Investigation Plan (CAIP) (DOE, 1998), the Mercury Fire Training Pit was used from approximately 1965 to the early 1990s to train fire-fighting and emergency response personnel at the NTS and encompasses an area approximately 85 by 115 m (280 by 380 ft). The location of the Mercury Fire Training Pit is shown in Figure 1 and a site plan is shown in Figure 2. The Mercury Fire Training Pit formerly included a bermed bum pit with four …
Date:
April 1, 2000
Creator:
Obi, C. M.
Object Type:
Report
System:
The UNT Digital Library
Code One, Volume 15, Number 2, April 2000
Quarterly publication of the Lockheed Martin plant in Fort Worth, Texas describing their products, research, and employees, as well as articles about pilots and others using the aircraft they produce.
Date:
April 2000
Creator:
Lockheed Martin Astronautics (Firm)
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Comments, April 2000
Newsletter of the Gulf Coast Waste Disposal Authority discussing news and updates related to the organization's meetings and activities, changes to regulations, and other relevant information.
Date:
April 2000
Creator:
Gulf Coast Waste Disposal Authority
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Comments on the paper entitled "Determination of the equilibrium constant for complex formation in a binary mixture of chloroform and triethylamine from viscosity data on the basis of the ideal associated solution model"
Article commenting on the paper entitled "Determination of the equilibrium constant for complex formation in a binary mixture of chloroform and triethylamine from viscosity data on the basis of the idea associated solution model"
Date:
April 2000
Creator:
Acree, William E. (William Eugene)
Object Type:
Article
System:
The UNT Digital Library
Compendium of Budget Accounts: Fiscal Year 2001
A staff study issued by the General Accounting Office with an abstract that begins "GAO presented a compendium of fiscal year (FY) 2001 budget accounts to give users a convenient way to: (1) sort through the federal government's fiscal structure; and (2) determine the level of used, estimated, or requested budgetary resources for individual accounts."
Date:
April 1, 2000
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
Computational methods for coupling microstructural and micromechanical materials response simulations
Computational materials simulations have traditionally focused on individual phenomena: grain growth, crack propagation, plastic flow, etc. However, real materials behavior results from a complex interplay between phenomena. In this project, the authors explored methods for coupling mesoscale simulations of microstructural evolution and micromechanical response. In one case, massively parallel (MP) simulations for grain evolution and microcracking in alumina stronglink materials were dynamically coupled. In the other, codes for domain coarsening and plastic deformation in CuSi braze alloys were iteratively linked. this program provided the first comparison of two promising ways to integrate mesoscale computer codes. Coupled microstructural/micromechanical codes were applied to experimentally observed microstructures for the first time. In addition to the coupled codes, this project developed a suite of new computational capabilities (PARGRAIN, GLAD, OOF, MPM, polycrystal plasticity, front tracking). The problem of plasticity length scale in continuum calculations was recognized and a solution strategy was developed. The simulations were experimentally validated on stockpile materials.
Date:
April 1, 2000
Creator:
Holm, Elizabeth A.; Battaile, Corbett C.; Buchheit, Thomas E.; Fang, Huei Eliot; Rintoul, Mark Daniel; Vedula, Venkata R. et al.
Object Type:
Report
System:
The UNT Digital Library
Computer Simulation of Intergranular Stress Corrosion Cracking via Hydrogen Embrittlement
Computer simulation has been applied to the investigation of intergranular stress corrosion cracking in Ni-based alloys based on a hydrogen embrittlement mechanism. The simulation employs computational modules that address (a) transport and reactions of aqueous species giving rise to hydrogen generation at the liquid-metal interface, (b) solid state transport of hydrogen via intergranular and transgranular diffusion pathways, and (c) fracture due to the embrittlement of metallic bonds by hydrogen. A key focus of the computational model development has been the role of materials microstructure (precipitate particles and grain boundaries) on hydrogen transport and embrittlement. Simulation results reveal that intergranular fracture is enhanced as grain boundaries are weakened and that microstructures with grains elongated perpendicular to the stress axis are more susceptible to cracking. The presence of intergranular precipitates may be expected to either enhance or impede cracking depending on the relative distribution of hydrogen between the grain boundaries and the precipitate-matrix interfaces. Calculations of hydrogen outgassing and in gassing demonstrate a strong effect of charging method on the fracture behavior.
Date:
April 1, 2000
Creator:
Smith, R.W.
Object Type:
Article
System:
The UNT Digital Library
Congressional Record: Proceedings and Debates of the 106th Congress, Second Session, Volume 146, Part 3
The Congressional Record contains the records for sessions of the U.S. Congress including summaries of proceedings, letters, and speeches for the Senate and House of Representatives.
Date:
April 2000
Creator:
United States. Congress.
Object Type:
Book
System:
The UNT Digital Library
Congressional Record: Proceedings and Debates of the 106th Congress, Second Session, Volume 146, Part 4
The Congressional Record contains the records for sessions of the U.S. Congress including summaries of proceedings, letters, and speeches for the Senate and House of Representatives.
Date:
April 2000
Creator:
United States. Congress.
Object Type:
Book
System:
The UNT Digital Library
Consideration of nuclear criticality when disposing of transuranic waste at the Waste Isolation Pilot Plant
Based on general arguments presented in this report, nuclear criticality was eliminated from performance assessment calculations for the Waste Isolation Pilot Plant (WIPP), a repository for waste contaminated with transuranic (TRU) radioisotopes, located in southeastern New Mexico. At the WIPP, the probability of criticality within the repository is low because mechanisms to concentrate the fissile radioisotopes dispersed throughout the waste are absent. In addition, following an inadvertent human intrusion into the repository (an event that must be considered because of safety regulations), the probability of nuclear criticality away from the repository is low because (1) the amount of fissile mass transported over 10,000 yr is predicted to be small, (2) often there are insufficient spaces in the advective pore space (e.g., macroscopic fractures) to provide sufficient thickness for precipitation of fissile material, and (3) there is no credible mechanism to counteract the natural tendency of the material to disperse during transport and instead concentrate fissile material in a small enough volume for it to form a critical concentration. Furthermore, before a criticality would have the potential to affect human health after closure of the repository--assuming that a criticality could occur--it would have to either (1) degrade the ability of the …
Date:
April 1, 2000
Creator:
RECHARD,ROBERT P.; SANCHEZ,LAWRENCE C.; STOCKMAN,CHRISTINE T. & TRELLUE,HOLLY R.
Object Type:
Report
System:
The UNT Digital Library
Constitutive models for the Etchegoin Sands, Belridge Diatomite, and overburden formations at the Lost Hills oil field, California
This report documents the development of constitutive material models for the overburden formations, reservoir formations, and underlying strata at the Lost Hills oil field located about 45 miles northwest of Bakersfield in Kern County, California. Triaxial rock mechanics tests were performed on specimens prepared from cores recovered from the Lost Hills field, and included measurements of axial and radial stresses and strains under different load paths. The tested intervals comprise diatomaceous sands of the Etchegoin Formation and several diatomite types of the Belridge Diatomite Member of the Monterey Formation, including cycles both above and below the diagenetic phase boundary between opal-A and opal-CT. The laboratory data are used to drive constitutive parameters for the Extended Sandler-Rubin (ESR) cap model that is implemented in Sandia's structural mechanics finite element code JAS3D. Available data in the literature are also used to derive ESR shear failure parameters for overburden formations. The material models are being used in large-scale three-dimensional geomechanical simulations of the reservoir behavior during primary and secondary recovery.
Date:
April 1, 2000
Creator:
FOSSUM,ARLO F. & FREDRICH,JOANNE T.
Object Type:
Report
System:
The UNT Digital Library
Continuous Fiber Wound Ceramic Composite (CFCC) for Commercial Water Reactor Fuel. Technical progress report for period ending April 1, 2000
Our program began on August 1, 1999. As of April 1, 2000, the progress has been in materials selection and test planning. Three subcontracts are in place (McDermott Technologies Inc. for continuous fiber reinforced ceramic tubing fabrication, Swales Aerospace for LOCA testing of tubes, and Massachusetts Institute of Technology for In Reactor testing of tubes). With regard to materials selection we visited McDermott Technologies Inc. a number of times, including on February 23, 2000 to discuss the Draft Material Selection and Fabrication Report. The changes discussed at this meeting were implemented and the final version of this report is attached (attachment 1). McDermott Technologies Inc. will produce one type of tubing: Alumina oxide (Nextel 610) fiber, a carbon coating (left in place), and alumina-yttria matrix. A potentially desirable CFCC material of silicon carbide fiber with spinel matrix was discussed. That material selection was not adopted primarily due to material availability and cost. Gamma Engineering is exploring the available tube coatings at Northwestern University as a mechanism for reducing the permeability of the tubes, and thus, will use coating as a differentiating factor in the testing of tubing in the LOCA test as well as the In-Reactor Test. The conclusion of …
Date:
April 1, 2000
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Corrective Action Plan for Corrective Action Unit 417: Central Nevada Test Area Surface, Nevada
This Corrective Action Plan provides methods for implementing the approved corrective action alternative as provided in the Corrective Action Decision Document for the Central Nevada Test Area (CNTA), Corrective Action Unit (CAU) 417 (DOE/NV, 1999). The CNTA is located in the Hot Creek Valley in Nye County, Nevada, approximately 137 kilometers (85 miles) northeast of Tonopah, Nevada. The CNTA consists of three separate land withdrawal areas commonly referred to as UC-1, UC-3, and UC-4, all of which are accessible to the public. CAU 417 consists of 34 Corrective Action Sites (CASs). Results of the investigation activities completed in 1998 are presented in Appendix D of the Corrective Action Decision Document (DOE/NV, 1999). According to the results, the only Constituent of Concern at the CNTA is total petroleum hydrocarbons (TPH). Of the 34 CASs, corrective action was proposed for 16 sites in 13 CASs. In fiscal year 1999, a Phase I Work Plan was prepared for the construction of a cover on the UC-4 Mud Pit C to gather information on cover constructibility and to perform site management activities. With Nevada Division of Environmental Protection concurrence, the Phase I field activities began in August 1999. A multi-layered cover using a Geosynthetic …
Date:
April 1, 2000
Creator:
Campbell, K.
Object Type:
Report
System:
The UNT Digital Library
Demonstration of jackhammer incorporating depleted uranium
The United States Government currently has an abundance of depleted uranium (DU). This surplus of about 1 billion pounds is the result of an enrichment process using gaseous diffusion to produce enriched and depleted uranium. The enriched uranium has been used primarily for either nuclear weapons for the military or nuclear fuel for the commercial power industry. Most of the depleted uranium remains at the enrichment process plants in the form of depleted uranium hexafluoride (DUF{sub 6}). The Department of Energy (DOE) recently began a study to identify possible commercial applications for the surplus material. One of these potential applications is to use the DU in high-density strikers/hammers in pneumatically driven tools, such as jack hammers and piledrivers to improve their impulse performance. The use of DU could potentially increase tunneling velocity and excavation into target materials with improved efficiency. This report describes the efforts undertaken to analyze the particulars of using DU in two specific striking applications: the jackhammer and chipper tool.
Date:
April 1, 2000
Creator:
Fischer, L E; Hoard, R W; Carter, D L; Saculla, M D & Wilson, G V
Object Type:
Report
System:
The UNT Digital Library
Development of Advanced Technologies to Reduce Design, Fabrication, and Construction Costs for Future Nuclear Plants. Technical Progress Report, February through April 2000
OAK-B135 Development of Advanced Technologies to Reduce Design, Fabrication, and Construction Costs for Future Nuclear Plants. Technical Progress Report, February through April 2000
Date:
April 1, 2000
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Development of Monitoring and Diagnostic Methods for Robots Used In Remediation of Waste Sites - Final Report
This project is the first evaluation of model-based diagnostics to hydraulic robot systems. A greater understanding of fault detection for hydraulic robots has been gained, and a new theoretical fault detection model developed and evaluated.
Date:
April 1, 2000
Creator:
Martin, M.
Object Type:
Report
System:
The UNT Digital Library
DGS Newsletter, Volume 24, Number 4, April 2000
Newsletter of the Dallas Genealogical Society discussing membership, Society meetings, genealogical workshops and events, and other news of interest to members.
Date:
April 2000
Creator:
Dallas Genealogical Society
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Direct Loan System Requirements: Checklist for Reviewing Systems Under the Federal Financial Management Improvement Act
Guidance issued by the General Accounting Office with an abstract that begins "GAO published a checklist to assist: (1) agencies in implementing and monitoring their direct loan systems; and (2) management and auditors in reviewing their direct loan systems to determine if they are in substantial compliance with the Federal Financial Management Improvement Act."
Date:
April 1, 2000
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
DISPOSAL OF FLUIDIZED BED COMBUSTION ASH IN AN UNDERGROUND MINE TO CONTROL ACID MINE DRAINAGE AND SUBSIDENCE
This project will evaluate the technical, economic and environmental feasibility of filling abandoned underground mine voids with alkaline, advanced coal combustion wastes (Fluidized Bed Combustion-FBC ash). Success will be measured in terms of technical feasibility of the approach (i.e. % void filling), cost, environmental benefits (acid mine drainage and subsidence control) and environmental impacts (noxious ion release). This document reports on progress made during Phase III. The report is divided into three major sections. The first deals with the Hydraulic Injection component. This section of the report describes the progress and milestones associated with the grouting activities of the project. The Phase III tasks of Economic Analysis and Regulatory Analysis is covered under this section. The second component is Pneumatic Injection. This section reports on progress made towards completing the demonstration project. The last component involves evaluating the migration of contaminants through the grouted mine. A computer model has been developed in earlier phases and will model the flow of water in and around the grouted Longridge mine.
Date:
April 1, 2000
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Dynamic Object Oriented Requirements System (DOORS) System Test Plan
The U. S. Department of Energy, Office of River Protection (ORP) will use the Dynamic Object Oriented Requirements System (DOORS) as a tool to assist in identifying, capturing, and maintaining the necessary and sufficient set of requirements for accomplishing the ORP mission. By managing requirements as one integrated set, the ORP will be able to carry out its mission more efficiently and effectively. DOORS is a Commercial-Off-The-Shelf (COTS) requirements management tool. The tool has not been customized for the use of the PIO, at this time.
Date:
April 1, 2000
Creator:
JOHNSON, A.L.
Object Type:
Report
System:
The UNT Digital Library
The Effect of Li, He and Ca on Grain Boundary Cohesive Strength in Ni
Boron is added to nickel-base superalloys such as Alloy X-750 in order to enhance high temperature strength and ductility so that the alloy may be more easily hot worked[1]. Boron additions also have been shown to ameliorate intergranular hydrogen embrittlement in nickel[2], and to improve the high temperature resistance of Alloy X-750 to aqueous stress corrosion cracking (SCC) in the absence of irradiation[3]. Recent quantum mechanical calculations demonstrate that boron strengthens grain boundaries in pure nickel[4], and may contribute to the observed benefits of boron on workability and fracture resistance of nickel alloys. Alloy X-750 exhibits greater susceptibility to intergranular stress corrosion cracking (IGSCC) when irradiated[5], and it has been proposed that the presence of grain boundary helium and/or lithium is responsible. Arguments have been advanced that helium embrittlement of the grain boundaries is primarily responsible for the greater observed susceptibility to IGSCC in irradiated X-750[1]. Alternatively, it has been proposed that lithium promotes IGSCC either by entering the water at the crack tip and lowering the local pH, or by inducing a restructuring of the grain boundary itself[1]. Direct embrittlement of grain boundaries by lithium also has been investigated by ion bombardment in Nimonic PE16, illustrating that under certain …
Date:
April 1, 2000
Creator:
Smith, Richard W.; Geng, W. T.; Geller, Clint B.; Wu, R. & Freeman, A. J.
Object Type:
Article
System:
The UNT Digital Library