Degree Department

Degree Discipline

Degree Level

522 Matching Results

Results open in a new window/tab.

Analysis of Barrel Support Saddles and Forces Between Modules During Assembly. (open access)

Analysis of Barrel Support Saddles and Forces Between Modules During Assembly.

As the Barrel Tile Calorimeter is constructed, the support saddles and the modules will be subjected to different forces, stresses, and deflections than when completely assembled. The purpose of this analysis is to examine the forces, stresses, and deflections acting on the support saddles and modules at various stages of assembly. The nominal weight of a barrel module is 20 tons. CERN Document number ATL-LB-EA-0001 'Summary of the Structural Analysis of the Barrel Support Saddles' describes in detail the structural analysis of the saddles and the completed barrel assembly. These calculations followed Eurocode 3. This paper examined several load cases which occur during the assembly of the Barrel. The following are the main conclusions: (1) The assembly is not stable until 18 modules are in place, and only then can the support cradle be removed; (2) The forces between modules are nominal and are far less that the forces in the completed cylinder with 64 modules in place and the cryostat load applied; (3) All of the stresses in the connections between modules are within acceptable limits; and (4) The interface between the cryostat supports and the cryostat move approximately 1.0 mm in the X and Y directions when the …
Date: April 23, 2003
Creator: Guarino, V. J.
Object Type: Report
System: The UNT Digital Library
Antiproton stacking in the Recycler (open access)

Antiproton stacking in the Recycler

Possibilities to accumulate antiprotons in the Recycler are considered for three different cases: with current stochastic cooling, with upgraded stochastic cooling and with electron cooling. With stochastic cooling only, even upgraded, Recycler looks hardly useful. However, with electron cooling at its goal parameters and reasonably good vacuum in the Recycler, this machine would be efficient.
Date: June 23, 2003
Creator: Burov, Alexey
Object Type: Article
System: The UNT Digital Library
Applying Agreed-Upon Procedures: Airport and Airway Trust Fund Excise Taxes (open access)

Applying Agreed-Upon Procedures: Airport and Airway Trust Fund Excise Taxes

Correspondence issued by the General Accounting Office with an abstract that begins "We evaluated fiscal year 2002 activity affecting distributors to the Airport and Airway Trust Fund (AATF)."
Date: January 23, 2003
Creator: United States. General Accounting Office.
Object Type: Text
System: The UNT Digital Library
Applying Agreed-Upon Procedures: Federal Unemployment Taxes (open access)

Applying Agreed-Upon Procedures: Federal Unemployment Taxes

Correspondence issued by the General Accounting Office with an abstract that begins "We evaluated fiscal year 2002 activity affecting distributions to the Unemployment Trust Fund (UTF)."
Date: January 23, 2003
Creator: United States. General Accounting Office.
Object Type: Text
System: The UNT Digital Library
Applying Agreed-Upon Procedures: Highway Trust Fund Excise Taxes (open access)

Applying Agreed-Upon Procedures: Highway Trust Fund Excise Taxes

Correspondence issued by the General Accounting Office with an abstract that begins "We evaluated fiscal year 2002 activity affecting distributions to the Highway Trust Fund (HTF)."
Date: January 23, 2003
Creator: United States. General Accounting Office.
Object Type: Text
System: The UNT Digital Library
Appropriations for FY2003: District of Columbia (open access)

Appropriations for FY2003: District of Columbia

Appropriations are one part of a complex federal budget process that includes budget resolutions, appropriations (regular, supplemental, and continuing) bills, rescissions, and budget reconciliation bills. This report is a guide to one of the 13 regular appropriations bills that Congress passes each year. It is designed to supplement the information provided by the House and Senate Interior Appropriations Subcommittees.
Date: March 23, 2003
Creator: Boyd, Eugene
Object Type: Report
System: The UNT Digital Library
Aqueous corrosion of aluminum-based nuclear fuel. (open access)

Aqueous corrosion of aluminum-based nuclear fuel.

As part of the U.S. National Spent Nuclear Fuel Program, aluminide fuels (UAl{sub x}) are being tested under conditions that might exist in the proposed repository at Yucca Mountain, Nevada. Intermittent drip tests at 90 C were completed for up to 183 days on partially declad, unirradiated, low-enriched UAl{sub x} samples. Through 183 days of exposure to modified water from the J-13 well at 90 C, the fuel coupon remained in good mechanical condition. Only a tarnishing of the surface was observed and no spalled products were found in the fuel holder. The mechanism for alteration is consistent with that observed from dry oxidation experiments on UAl{sub x} (for the initial corrosion) and humid UO{sub 2} oxidation (for the subsequent paragenesis). Specifically, solid-state conversion of UAl{sub x} into UO{sub 2} and oxidized Al is followed by further oxidation, dissolution of the uranium, and reprecipitation as uranyl oxyhydroxides. The release rate of uranium varied from 0.23 to 2.9 mg/m{sup 2}/day (avg. = 0.97 mg U/m{sup 2}/day) depending on the specimen and test interval, but was similar in magnitude to that observed in earlier flow-through and drip tests with irradiated UAl{sub x} and UO{sub 2}. Most (mean=87%) of the released uranium sorbed …
Date: April 23, 2003
Creator: Kaminski, M.
Object Type: Report
System: The UNT Digital Library
Archaeological Survey of the Travis Ranch Wastewater Treatment Plant Site (open access)

Archaeological Survey of the Travis Ranch Wastewater Treatment Plant Site

A report of a pedestrian survey for a proposed wastewater treatment plant and two outflow pipeline right-of-ways conducted southeast of Lake Ray Hubbard and in the floodplain of Trinity River.
Date: October 23, 2003
Creator: Todd, Jesse
Object Type: Report
System: The Portal to Texas History
The Archer Advocate (Holliday, Tex.), Vol. 1, No. 3, Ed. 1 Wednesday, April 23, 2003 (open access)

The Archer Advocate (Holliday, Tex.), Vol. 1, No. 3, Ed. 1 Wednesday, April 23, 2003

Weekly newspaper from Holliday, Texas that includes local, state, and national news along with advertising.
Date: April 23, 2003
Creator: Thomas, John
Object Type: Newspaper
System: The Portal to Texas History
The Archer Advocate (Holliday, Tex.), Vol. 1, No. 16, Ed. 1 Wednesday, July 23, 2003 (open access)

The Archer Advocate (Holliday, Tex.), Vol. 1, No. 16, Ed. 1 Wednesday, July 23, 2003

Weekly newspaper from Holliday, Texas that includes local, state, and national news along with advertising.
Date: July 23, 2003
Creator: Thomas, John
Object Type: Newspaper
System: The Portal to Texas History
Archer County News (Archer City, Tex.), No. 4, Ed. 1 Thursday, January 23, 2003 (open access)

Archer County News (Archer City, Tex.), No. 4, Ed. 1 Thursday, January 23, 2003

Weekly newspaper from Archer City, Texas that includes local, state, and national news along with advertising.
Date: January 23, 2003
Creator: Lewis, Shelley
Object Type: Newspaper
System: The Portal to Texas History
Archer County News (Archer City, Tex.), No. 43, Ed. 1 Thursday, October 23, 2003 (open access)

Archer County News (Archer City, Tex.), No. 43, Ed. 1 Thursday, October 23, 2003

Weekly newspaper from Archer City, Texas that includes local, state, and national news along with advertising.
Date: October 23, 2003
Creator: Lewis, Shelley
Object Type: Newspaper
System: The Portal to Texas History
Armenia, Azerbaijan, and Georgia: Political Developments and Implications for U.S. Interests (open access)

Armenia, Azerbaijan, and Georgia: Political Developments and Implications for U.S. Interests

The United States recognized the independence of all the former Soviet republics by the end of 1991, including the South Caucasus states of Armenia, Azerbaijan, and Georgia. The United States has fostered these states' ties with the West in part to end the dependence of these states on Russia for trade, security, and other relations. The FREEDOM Support Act of 1992 provides authorization for assistance to the Eurasian states for humanitarian needs, democratization, and other purposes. In the aftermath of the September 11, 2001, terrorist attacks on the United States, the Administration appealed for a national security waiver of the prohibition on aid to Azerbaijan, in consideration of Azerbaijan's assistance to the international coalition to combat terrorism. Azerbaijani and Georgian troops participate in stabilization efforts in Afghanistan and Iraq, and Armenian personnel serve in Iraq.
Date: January 23, 2003
Creator: Nichol, Jim
Object Type: Report
System: The UNT Digital Library
Assessing the Proliferation Resistance of Innovative Nuclear Fuel Cycles (open access)

Assessing the Proliferation Resistance of Innovative Nuclear Fuel Cycles

The National Nuclear Security Administration is developing methods for nonproliferation assessments to support the development and implementation of U.S. nonproliferation policy. This paper summarizes the key results of that effort. Proliferation resistance is the degree of difficulty that a nuclear material, facility, process, or activity poses to the acquisition of one or more nuclear weapons. A top-level measure of proliferation resistance for a fuel cycle system is developed here from a hierarchy of metrics. At the lowest level, intrinsic and extrinsic barriers to proliferation are defined. These barriers are recommended as a means to characterize the proliferation characteristics of a fuel cycle. Because of the complexity of nonproliferation assessments, the problem is decomposed into: metrics to be computed, barriers to proliferation, and a finite set of threats. The spectrum of potential threats of nuclear proliferation is complex and ranges from small terrorist cells to industrialized countries with advanced nuclear fuel cycles. Two general categories of methods have historically been used for nonproliferation assessments: attribute analysis and scenario analysis. In the former, attributes of the systems being evaluated (often fuel cycle systems) are identified that affect their proliferation potential. For a particular system under consideration, the attributes are weighted subjectively. In …
Date: June 23, 2003
Creator: Bari, R.; Roglans, J.; Denning, R. & Mladineo, S.
Object Type: Article
System: The UNT Digital Library
Assessment of Release Rates for Radionuclides in Activated Concrete. (open access)

Assessment of Release Rates for Radionuclides in Activated Concrete.

The Maine Yankee (MY) nuclear power plant is undergoing the process of decontamination and decommissioning (D&D). Part of the process requires analyses that demonstrate that any radioactivity that remains after D&D will not cause exposure to radioactive contaminants to exceed acceptable limits. This requires knowledge of the distribution of radionuclides in the remaining material and their potential release mechanisms from the material to the contacting groundwater. In this study the concern involves radionuclide contamination in activated concrete in the ICI Sump below the containment building. Figures 1-3 are schematic representations of the ICI Sump. Figure 2 and 3 contain the relevant dimensions needed for the analysis. The key features of Figures 2 and 3 are the 3/8-inch carbon steel liner that isolates the activated concrete from the pit and the concrete wall, which is between 7 feet and 7 feet 2 inches thick. During operations, a small neutron flux from the reactor activated the carbon steel liner and the concrete outside the liner. Current MY plans call for filling the ICI sump with compacted sand.
Date: August 23, 2003
Creator: Sullivan, T. M.
Object Type: Report
System: The UNT Digital Library

[Assistant crew director and two others at a restaurant: Lone Star Ride 2003 event photo]

Photograph of three older individuals sitting together at a restaurant table enjoying chips with dishes of salsa and queso. A stack of LSR registration pamphlets is set up in the middle of the table next to a bottle of Shiner beer and a basket of chips. The two women both have name stickers stuck to their chests that read "Faye" and "Mona L.". Mona L. is labeled as the assistant crew director.
Date: July 23, 2003
Creator: unknown
Object Type: Photograph
System: The UNT Digital Library
Astronomy Applications of Adaptive Optics at Lawrence Livermore National Laboratory (open access)

Astronomy Applications of Adaptive Optics at Lawrence Livermore National Laboratory

Astronomical applications of adaptive optics at Lawrence Livermore National Laboratory (LLNL) has a history that extends from 1984. The program started with the Lick Observatory Adaptive Optics system and has progressed through the years to lever-larger telescopes: Keck, and now the proposed CELT (California Extremely Large Telescope) 30m telescope. LLNL AO continues to be at the forefront of AO development and science.
Date: April 23, 2003
Creator: Bauman, B J & Gavel, D T
Object Type: Article
System: The UNT Digital Library
Aviation Safety: Information on FAA's Data on Operational Errors At Air Traffic Control Towers (open access)

Aviation Safety: Information on FAA's Data on Operational Errors At Air Traffic Control Towers

Correspondence issued by the General Accounting Office with an abstract that begins "A fundamental principle of aviation safety is the need to maintain adequate separation between aircraft and to ensure that aircraft maintain a safe distance from terrain, obstructions, and airspace that is not designated for routine air travel. Air traffic controllers employ separation rules and procedures that define safe separation in the air and on the ground.1 An operational error occurs when the separation rules and procedures are not followed due to equipment or human error. Data maintained by the Federal Aviation Administration (FAA) indicate that a very small number of operational errors occur in any given year--on average about three operational errors per day occurred in fiscal year 2002. However, some of these occurrences can pose safety risks by directing aircraft onto converging courses and, potentially, midair collisions. Congress asked us to provide information on FAA's data on operational errors and whether this data can be used to identify types of air traffic control facilities with greater safety risks. Specifically, we were asked to (1) determine what is known about the reliability and validity of the data that FAA maintains on operational errors and (2) identify whether comparisons …
Date: September 23, 2003
Creator: United States. General Accounting Office.
Object Type: Text
System: The UNT Digital Library
Band anticrossing in dilute nitrides (open access)

Band anticrossing in dilute nitrides

Alloying III-V compounds with small amounts of nitrogen leads to dramatic reduction of the fundamental band-gap energy in the resulting dilute nitride alloys. The effect originates from an anti-crossing interaction between the extended conduction-band states and localized N states. The interaction splits the conduction band into two nonparabolic subbands. The downward shift of the lower conduction subband edge is responsible for the N-induced reduction of the fundamental band-gap energy. The changes in the conduction band structure result in significant increase in electron effective mass and decrease in the electron mobility, and lead to a large enhance of the maximum doping level in GaInNAs doped with group VI donors. In addition, a striking asymmetry in the electrical activation of group IV and group VI donors can be attributed to mutual passivation process through formation of the nearest neighbor group-IV donor nitrogen pairs.
Date: December 23, 2003
Creator: Shan, W.; Yu, K. M.; Walukiewicz, W.; Wu, J.; Ager, J. W., III & Haller, E. E.
Object Type: Article
System: The UNT Digital Library
The Baytown Sun (Baytown, Tex.), Vol. 81, No. 59, Ed. 1 Thursday, January 23, 2003 (open access)

The Baytown Sun (Baytown, Tex.), Vol. 81, No. 59, Ed. 1 Thursday, January 23, 2003

Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date: January 23, 2003
Creator: Cash, Wanda Garner
Object Type: Newspaper
System: The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 81, No. 90, Ed. 1 Sunday, February 23, 2003 (open access)

The Baytown Sun (Baytown, Tex.), Vol. 81, No. 90, Ed. 1 Sunday, February 23, 2003

Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date: February 23, 2003
Creator: Cash, Wanda Garner
Object Type: Newspaper
System: The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 81, No. 118, Ed. 1 Sunday, March 23, 2003 (open access)

The Baytown Sun (Baytown, Tex.), Vol. 81, No. 118, Ed. 1 Sunday, March 23, 2003

Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date: March 23, 2003
Creator: Cash, Wanda Garner
Object Type: Newspaper
System: The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 81, No. 149, Ed. 1 Wednesday, April 23, 2003 (open access)

The Baytown Sun (Baytown, Tex.), Vol. 81, No. 149, Ed. 1 Wednesday, April 23, 2003

Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date: April 23, 2003
Creator: Cash, Wanda Garner
Object Type: Newspaper
System: The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 81, No. 179, Ed. 1 Friday, May 23, 2003 (open access)

The Baytown Sun (Baytown, Tex.), Vol. 81, No. 179, Ed. 1 Friday, May 23, 2003

Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date: May 23, 2003
Creator: Cash, Wanda Garner
Object Type: Newspaper
System: The Portal to Texas History