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119
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42
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32
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José L. Castillo Photograph Collection
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National Parks Air Tour Management Act: More Flexibility and Better Enforcement Needed
A letter report issued by the Government Accountability Office with an abstract that begins "Primarily because of concerns that noise from air tours over national parks could impair visitors' experiences and park resources, Congress passed the National Parks Air Tour Management Act of 2000 to regulate air tours. The act requires the Federal Aviation Administration (FAA) and the National Park Service to develop air tour management plans for all parks where air tour operators apply to conduct tours. A plan may establish controls over tours, such as routes, altitudes, time of day restrictions, and/or a maximum number of flights for a given period; or ban all air tours. GAO was asked to (1) determine the status of FAA and the Park Service's implementation of the act; (2) assess how the air tour operators and national parks have been affected by implementation; and (3) identify what issues, if any, need to be addressed to improve implementation."
Date:
January 27, 2006
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
NEPHELINE FORMATION POTENTIAL IN SLUDGE BATCH 4 AND ITS IMPACT ON DURABILITY: SELECTING GLASSES FOR A PHASE 3 STUDY
Savannah River National Laboratory's frit development effort for SB4 is being driven by the most current CBU option for this sludge, referred to as Case 15C Blend 1. Candidate frits have been identified for this option via a paper study approach developed by Peeler and Edwards with the intent of down-selecting to a set of key frits whose operating windows (i.e., WL intervals that meet PCCS MAR criteria) are robust to and/or selectively optimal for this sludge option. The primary frits that appear attractive on paper (i.e., down-selected via the paper study) are now being incorporated into this experimental study. The potential for the formation of a nepheline primary crystalline phase is an important factor in frit development for SB4, due to the high Al{sub 2}O{sub 3} content of this sludge. Based upon earlier work by Li et al., glasses that do not satisfy the constraint: (SiO{sub 2}/SiO{sub 2} + Na{sub 2}O + Al{sub 2}O{sub 3}) > 0.62 where the oxides are expressed as mass fractions in the glass, will precipitate nepheline as their primary crystalline phase, hindering the durability of the glass. Based on the most recent compositional projection from the CBU for SB4 (Case 15C Blend 1), 16 …
Date:
January 27, 2006
Creator:
Fox, K
Object Type:
Report
System:
The UNT Digital Library
Niobium Oxide Film Deposition Using a High-Density Plasma Source
Niobium oxide was deposited reactively using a new type of high-density plasma sputter source. The plasma beam used for sputtering is generated remotely and its path to the target defined by the orthogonal locations of two electromagnets: one at the orifice of the plasma tube and the other just beneath the target plane. To accommodate very large batches of substrates, the trade-off between load capacity and deposition rates was evaluated. The effect on deposition rate was determined by moving the plasma source away from the target in one direction and by moving the target assembly away in an orthogonal direction. A simple methodology was used to reestablish the reactive deposition rate and oxide quality even when large changes were made to the chamber geometry. Deposition parameters were established to produce nonabsorbing niobium oxide films of about 100- and 350-nm thicknesses. The quality of the niobium oxide films was studied spectroscopically, ellipsometrically, and stoichiometrically.
Date:
January 27, 2006
Creator:
Chow, R.; Schmidt, M. A.; Coombs, A. W.; Anguita, J. & Thwaites, M. J.
Object Type:
Article
System:
The UNT Digital Library
Numerically Solvable Model for Resonant Collisions of Electronswith Diatomic Molecules
We describe a simple model for electron-molecule collisions that has one nuclear and one electronic degree of freedom and that can be solved to arbitrarily high precision, without making the Born-Oppenheimer approximation, by employing a combination of the exterior complex scaling method and a finite-element implementation of the discrete variable representation. We compare exact cross sections for vibrational excitation and dissociative attachment with results obtained using the local complex potential approximation as commonly applied in the ''boomerang'' model, and suggest how this two-dimensional model can be used to test the underpinnings of contemporary nonlocal approximations to resonant collisions.
Date:
January 27, 2006
Creator:
Houfek, Karel; Rescigno, T. N. & McCurdy, C. W.
Object Type:
Article
System:
The UNT Digital Library
Ocean Commissions: Ocean Policy Review and Outlook
None
Date:
January 27, 2006
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Offshoring (a.k.a. Offshore Outsourcing) and Job Insecurity Among U.S. Workers
None
Date:
January 27, 2006
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
The Oklahoma Daily (Norman, Okla.), Vol. 90, No. 88, Ed. 1 Friday, January 27, 2006
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
January 27, 2006
Creator:
Ganus, Sara
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Operations Noble Eagle, Enduring Freedom, and Iraqi Freedom: Questions and Answers About U.S. Military Personnel, Compensation, and Force Structure
None
Date:
January 27, 2006
Creator:
Kapp, Lawrence & Henning, Charles A.
Object Type:
Report
System:
The UNT Digital Library
The Optimist (Abilene, Tex.), Vol. 94, No. 31, Ed. 1, Friday, January 27, 2006
Weekly student newspaper from Abilene Christian University in Abilene, Texas that includes local, state and campus news along with advertising.
Date:
January 27, 2006
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Pension Benefit Guaranty Corporation: A Fact Sheet
None
Date:
January 27, 2006
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Perry Daily Journal (Perry, Okla.), Vol. 113, No. 19, Ed. 1 Friday, January 27, 2006
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
January 27, 2006
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Ranger (San Antonio, Tex.), Vol. 80, No. 13, Ed. 1 Friday, January 27, 2006
Weekly student newspaper from San Antonio College in San Antonio, Texas that includes campus news along with advertising.
Date:
January 27, 2006
Creator:
San Antonio College
Object Type:
Newspaper
System:
The Portal to Texas History
Reliable Electronic Structure Calculations for Heavy Element Chemistry: Molecules Containing Actinides, Lanthanides, and Transition Metals
It is now possible to calculate many properties including the energetics (total bond dissociation energies or heats of formation) of molecules containing light elements to high accuracy by using correlation-consistent basis sets, coupled cluster theory and including additive corrections for core-valence and relativistic effects and careful treatment of the zero point energy. We propose to develop software for ab initio electronic structure calculations based on molecular orbital theory and density functional theory with the proper treatment of relativistic effects to study complexes of heavy elements in order to assist in understanding and predicting the chemistry of the actinides, lanthanides, and heavy transition metals, molecules critical to DOE missions including environmental management. The proposed work will focus on the development of these electronic structure methods and their implementation in software on advanced massively parallel processor (MPP) computer architectures capable of multi-tens of teraflops to petaflops. The core of the software will be developed within the NWChem and Columbus software suites. We propose to make the software broadly available so that other scientists can use these tools to address the complex environmental problems facing the Department of EnergyÃÂÃÂÃÂâÃÂÃÂÃÂÃÂÃÂÃÂÃÂÃÂs nuclear production sites as well as other waste sites in the Nation. Our implementation …
Date:
January 27, 2006
Creator:
Marino, Maria M. & Ermler, Walter C.
Object Type:
Report
System:
The UNT Digital Library
The Rice Thresher, Vol. 93, No. 16, Ed. 1 Friday, January 27, 2006
A weekly student newspaper from the Rice University in Houston, Texas that includes campus news and commentaries along with advertising.
Date:
January 27, 2006
Creator:
Obermeyer, Amber
Object Type:
Newspaper
System:
The Portal to Texas History
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 91, No. 118, Ed. 1 Friday, January 27, 2006
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
January 27, 2006
Creator:
Stone, Greg
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Scaling of Thermal-Hydraulic Experiments for a Space Rankine Cycle and Selection of a Preconceptual Scaled Experiment Design
To assist with the development of a space-based Rankine cycle power system using liquid potassium as the working fluid, a study has been conducted on possible scaled experiments with simulant fluids. This report will consider several possible working fluids and describe a scaling methodology to achieve thermal-hydraulic similarity between an actual potassium system and scaled representations of the Rankine cycle boiler or condenser. The most practical scaling approach examined is based on the selection of perfluorohexane (FC-72) as the simulant. Using the scaling methodology, a series of possible solutions have been calculated for the FC-72 boiler and condenser. The possible scaled systems will then be compared and preconceptual specifications and drawings given for the most promising design. The preconceptual design concept will also include integrating the scaled boiler and scaled condenser into a single experimental loop. All the preconceptual system specifications appear practical from a fabrication and experimental standpoint, but further work will be needed to arrive at a final experiment design.
Date:
January 27, 2006
Creator:
Sulfredge, CD
Object Type:
Report
System:
The UNT Digital Library
Scene: North Texas Daily (Denton, Tex.), Vol. 90, No. 62, Ed. 1 Friday, January 27, 2006
Weekly magazine edition of the daily student newspaper from the University of North Texas in Denton, Texas that includes local, state and campus news along with advertising.
Date:
January 27, 2006
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
School Facilities Infrastructure: Background and Legislative Proposals
None
Date:
January 27, 2006
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
The Sealy News (Sealy, Tex.), Vol. 119, No. 8, Ed. 1 Friday, January 27, 2006
Semiweekly newspaper from Sealy, Texas that includes local, state, and national news along with advertising.
Date:
January 27, 2006
Creator:
Griffin, Joanie & Ermis, Jay
Object Type:
Newspaper
System:
The Portal to Texas History
Side-by-Side Comparison of Medicare, Medicaid, and SCHIP Provisions in the Deficit Reduction Act of 2005
None
Date:
January 27, 2006
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Space Nuclear Power Plant Pre-Conceptual Design Report, For Information
This letter transmits, for information, the Project Prometheus Space Nuclear Power Plant (SNPP) Pre-Conceptual Design Report completed by the Naval Reactors Prime Contractor Team (NRPCT). This report documents the work pertaining to the Reactor Module, which includes integration of the space nuclear reactor with the reactor radiation shield, energy conversion, and instrumentation and control segments. This document also describes integration of the Reactor Module with the Heat Rejection segment, the Power Conditioning and Distribution subsystem (which comprise the SNPP), and the remainder of the Prometheus spaceship.
Date:
January 27, 2006
Creator:
Levine, B.
Object Type:
Report
System:
The UNT Digital Library
Spatial Statistical Procedures to Validate Input Data in Energy Models
Energy modeling and analysis often relies on data collected for other purposes such as census counts, atmospheric and air quality observations, economic trends, and other primarily non-energy-related uses. Systematic collection of empirical data solely for regional, national, and global energy modeling has not been established as in the above-mentioned fields. Empirical and modeled data relevant to energy modeling is reported and available at various spatial and temporal scales that might or might not be those needed and used by the energy modeling community. The incorrect representation of spatial and temporal components of these data sets can result in energy models producing misleading conclusions, especially in cases of newly evolving technologies with spatial and temporal operating characteristics different from the dominant fossil and nuclear technologies that powered the energy economy over the last two hundred years. Increased private and government research and development and public interest in alternative technologies that have a benign effect on the climate and the environment have spurred interest in wind, solar, hydrogen, and other alternative energy sources and energy carriers. Many of these technologies require much finer spatial and temporal detail to determine optimal engineering designs, resource availability, and market potential. This paper presents exploratory and …
Date:
January 27, 2006
Creator:
Lawrence Livermore National Laboratory
Object Type:
Report
System:
The UNT Digital Library
Spatial Statistical Procedures to Validate Input Data in Energy Models
None
Date:
January 27, 2006
Creator:
Johannesson, G; McCollom, T & Barr, C
Object Type:
Report
System:
The UNT Digital Library
Studies of the Strange Hadronic Tau Decay Tau- to K0(S) Pi- Nu-Tau Using the BaBar Detector
A study of the decay {tau}{sup -} {yields} K{sub S}{sup 0}{pi}{sup -} {nu}{sub {tau}} (K{sub S}{sup 0} {yields} {pi}{sup +}{pi}{sup -}) using the BABAR detector is presented. Using 124.4 fb{sup -1} of data we measure {Beta}({tau}{sup -} {yields} {bar K}{sup 0}{pi}{sup -}{nu}{sub {tau}}) = (0.830 {+-} 0.005(stat) {+-} 0.042(syst))%, which is the world's most precise measurement to date of this branching ratio, and is consistent with the current world average. This preliminary result, unlike most of the {Beta}({tau}{sup -} {yields} {bar K}{sup 0}{pi}{sup -}{nu}{sub {tau}}) measurements already published, is systematics dominated and so the biggest future improvement to this number should come from reducing the systematic uncertainties in the analysis. A study of the K{pi} mass spectrum, from which the strange (K{pi}) spectral function can be measured, reveals excess contributions above the K*(892) tail at higher K{pi} mass. While in the past this has been thought to be due to K*(892) - K*(1410) interference, we find that the K*(1410), whose branching ratio to K{pi} is approximately 7%, seems insufficient to explain the excess mass observed in the data. Instead, we perform a fit using a K*(892) - K*(1680) interference model and find better agreement. The discrepancy that remains could be …
Date:
January 27, 2006
Creator:
Lyon, Andrew J. & /SLAC, /Manchester U.
Object Type:
Report
System:
The UNT Digital Library