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5,677
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3,668
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850
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361
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99
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A 3-D model of superfluid helium suitable for numerical analysis
The two-fluid description is a very successful phenomenological representation of the properties of Helium II. A 3-D model suitable for numerical analysis based on the Landau-Khalatnikov description of Helium II is proposed. In this paper we introduce a system of partial differential equations that is both complete and consistent as well as practical, to be used for a 3-D solution of the flow of Helium II. The development of a 3-D numerical model for Helium II is motivated by the need to validate experimental results obtained by observing the normal component velocity distribution in a Helium II thermal counter-flow using the Particle Image Velocimetry (PIV) technique.
Date:
January 1, 2008
Creator:
Darve, C.; U., /Fermilab /Northwestern; Patankar, N.A.; U., /Northwestern; Van Sciver, S.W. & Lab., /Natl. High Mag. Field
Object Type:
Article
System:
The UNT Digital Library
2007 Annual Summary Report for the Area 3 and Area 5 Radioactive Waste Management Sites at the Nevada Test Site, Nye County, Nevada
This report summarizes the results of an annual review of conditions affecting the operation of the Area 3 and Area 5 Radioactive Waste Management Sites (RWMSs) and a determination of the continuing adequacy of the performance assessments (PAs) and composite analyses (CAs). The Area 5 RWMS PA documentation consists of the original PA (Shott et al., 1998), referred to as the 1998 Area 5 RWMS PA and supporting addenda (Bechtel Nevada [BN], 2001b; 2006a). The Area 5 RWMS CA was issued as a single document (BN, 2001a) and has a single addendum (BN, 2001c). The Area 3 PA and CA were issued in a single document (Shott et al., 2000). The Maintenance Plan for the PAs and CAs (National Security Technologies, LLC [NSTec], 2006) and the Disposal Authorization Statements (DASs) for the Area 3 and 5 RWMSs (U.S. Department of Energy [DOE], 2000; 2002) require preparation of an annual summary and a determination of the continuing adequacy of the PAs and CAs. The annual summary report is submitted to DOE Headquarters. Following the annual report format in the DOE PA/CA Maintenance Guide (DOE, 1999), this report presents the annual summary for the PAs in Section 2.0 and the CAs in …
Date:
January 1, 2008
Creator:
National Security Technologies, LLC
Object Type:
Report
System:
The UNT Digital Library
2007 Inorganic Reaction Mechanisms Gordon Research Conference-February 18-23
This conference focuses on kinetic, mechanistic, and thermodynamic studies of reactions that play a role in fields as diverse as catalysis, energy, bioinorganic chemistry, green chemistry, organometallics, and activation of small molecules (oxygen, nitrogen, carbon monoxide, carbon dioxide, alkanes). Participants from universities, industry, and national laboratories present results and engage in discussions of pathways, intermediates, and outcome of various reactions of inorganic, organic, coordination, organometallic, and biological species. This knowledge is essential for rational development and design of novel reactions, compounds, and catalysts.
Date:
January 1, 2008
Creator:
Gray, Andreja Bakac Nancy Ryan
Object Type:
Article
System:
The UNT Digital Library
2008 Salary Survey
Fact finding survey on the average employee pay, period of employment, and methodology used for the survey.
Date:
2008
Creator:
Texas. Department of Criminal Justice.
Object Type:
Text
System:
The Portal to Texas History
2008 Turnover Survey
Survey conducted to examine the reason for the high voluntary termination rate among Texas Community Supervision and Corrections Department employees.
Date:
2008
Creator:
Texas. Department of Criminal Justice.
Object Type:
Text
System:
The Portal to Texas History
Abrupt Climate Change: Summary and Findings
This report summary outlines brief answers to four questions about climate change. Will there be an abrupt change in sea level? Will there be an abrupt change in the hydrologic cycle? Will there be an abrupt change in the atlantic Meridional Overturning Circulation (AMOC)? Will there be abrupt change in atmospheric methane?
Date:
2008
Creator:
Climate Change Science Program (U.S.)
Object Type:
Pamphlet
System:
The UNT Digital Library
Addressing a Nuclear Information Gap
This report talks about Addressing a nuclear information gap
Date:
January 1, 2008
Creator:
Sailor, William C
Object Type:
Article
System:
The UNT Digital Library
Advanced Hydrogen Turbine Development
Siemens has developed a roadmap to achieve the DOE goals for efficiency, cost reduction, and emissions through innovative approaches and novel technologies which build upon worldwide IGCC operational experience, platform technology, and extensive experience in G-class operating conditions. In Phase 1, the technologies and concepts necessary to achieve the program goals were identified for the gas turbine components and supporting technology areas and testing plans were developed to mitigate identified risks. Multiple studies were conducted to evaluate the impact in plant performance of different gas turbine and plant technologies. 2015 gas turbine technologies showed a significant improvement in IGCC plant efficiency, however, a severe performance penalty was calculated for high carbon capture cases. Thermodynamic calculations showed that the DOE 2010 and 2015 efficiency targets can be met with a two step approach. A risk management process was instituted in Phase 1 to identify risk and develop mitigation plans. For the risks identified, testing and development programs are in place and the risks will be revisited periodically to determine if changes to the plan are necessary. A compressor performance prediction has shown that the design of the compressor for the engine can be achieved with additional stages added to the rear …
Date:
January 1, 2008
Creator:
Fadok, Joesph
Object Type:
Report
System:
The UNT Digital Library
The Advocate, Volume 13, Issue 1, January-March 2008
Quarterly update providing information on environmental regulations for small businesses and local governments in Texas.
Date:
January 2008
Creator:
Texas Commission on Environmental Quality
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Analysis of X-Ray Spectra Emitted From the Venus ECR Ion Source
The Versatile Electron Cyclotron resonance ion source for Nuclear Science (VENUS), located at Lawrence Berkeley National Lab’s 88-inch cyclotron, extracts ion beams from a plasma created by ionizing a gas with energetic electrons. Liquid-helium cooled superconducting coils produce magnetic fi elds that confi ne the plasma and high microwave frequencies heat the electrons enough to allow for successive ionizations of the neutral gas atoms. The combination of strong plasma confi nement and high microwave frequencies results in VENUS’ production of record breaking ion beam currents and high charge state distributions. While in operation, VENUS produces signifi cant quantities of bremsstrahlung, in the form of x-rays, primarily through two processes: 1) electron-ion collisions within the plasma, and 2) electrons are lost from the plasma, collide with the plasma chamber wall, and radiate bremsstrahlung due to their sudden deceleration. The bremsstrahlung deposited into the plasma chamber wall is absorbed by the cold mass used to maintain superconductivity in the magnets and poses an additional heat load on the cryostat. In order for VENUS to reach its maximum operating potential of 10 kW of 28 GHz microwave heating frequency, the heat load posed by the emitted bremsstrahlung must be understood. In addition, studying …
Date:
January 1, 2008
Creator:
Benitez, J. & Leitner, D.
Object Type:
Article
System:
The UNT Digital Library
An analysis on the mid-latitude scintillation and coherence frequency bandwidth using transionospheric VHF signals
An analysis was perfonned on the mid-latitude scintillation and coherence frequency bandwidth (Fcoh) using transionospheric VHF signal data. The data include 1062 events spanning from November 1997 to June 2002. Each event records FORTE satellite received VHF signals from LAPP located at Los Alamos, New Mexico. Fcohs were derived to study scintillation characteristics on diurnal and seasonal variations, as well as changes due to solar and geomagnetic activities. Comparisons to the VHFIUHF coherence frequency bandwidth studies previously reported at equatorial and mid-latitude regions are made using a 4th power frequency dependence relationship. Furthennore, a wideband ionospheric scintillation model, WBMOD, was used to estimate Fcohs and compared with our VHF Fcoh values. Our analysis indicates mid-latitude scintillation characteristics that are not previously revealed. At the VHF bottom frequency range (3035 MHz), distinguished smaller Fcohs are found in time period from sunset to midnight, in wann season from May to August, and in low solar activity years. The effects of geomagnetic storm activity on Fcoh are characterized by a sudden transition at a Kp index of 50-60. Comparisons with median Fcohs estimated from other studies validated our VHF Fcohs for daytime while an order of magnitude larger Fcohs are found for nighttime, …
Date:
January 1, 2008
Creator:
Juang, Zhen & Roussel-dupre, Robert
Object Type:
Article
System:
The UNT Digital Library
Anomalous yield reduction in direct-drive DT implosions due to 3He addition
Glass capsules were imploded in direct drive on the OMEGA laser [T. R. Boehly et aI., Opt. Commun. 133, 495, 1997] to look for anomalous degradation in deuterium/tritium (DT) yield (i.e., beyond what is predicted) and changes in reaction history with {sup 3}He addition. Such anomalies have previously been reported for D/{sup 3}He plasmas, but had not yet been investigated for DT/{sup 3}He. Anomalies such as these provide fertile ground for furthering our physics understanding of ICF implosions and capsule performance. A relatively short laser pulse (600 ps) was used to provide some degree of temporal separation between shock and compression yield components for analysis. Anomalous degradation in the compression component of yield was observed, consistent with the 'factor of two' degradation previously reported by MIT at a 50% {sup 3}He atom fraction in D{sub 2} using plastic capsules [Rygg et aI., Phys. Plasmas 13, 052702 (2006)]. However, clean calculations (i.e., no fuel-shell mixing) predict the shock component of yield quite well, contrary to the result reported by MIT, but consistent with LANL results in D{sub 2}/{sup 3}He [Wilson, et aI., lml Phys: Conf Series 112, 022015 (2008)]. X-ray imaging suggests less-than-predicted compression ofcapsules containing {sup 3}He. Leading candidate explanations …
Date:
January 1, 2008
Creator:
Herrmann, Hans W.; Langenbrunner, James R.; Mack, Joseph M.; Cooley, James H.; Wilson, Douglas C.; Evans, Scott C. et al.
Object Type:
Article
System:
The UNT Digital Library
Approximations to wire grid inductance.
None
Date:
January 1, 2008
Creator:
Warne, Larry Kevin; Johnson, William Arthur & Merewether, Kimball O.
Object Type:
Report
System:
The UNT Digital Library
Archaeological Survey of the Proposed Weatherford 12-Inch Sewer Pipeline Route, Parker County, Texas
Results of field and archaeological investigations along with recommendations concerning proposed sewer pipeline.
Date:
2008
Creator:
AR Consultants
Object Type:
Report
System:
The Portal to Texas History
Assessment of Thermal Control Technologies for Cooling Electric Vehicle Power Electronics
NREL is assessing thermal control technologies to improve the thermal performance of power electronics devices for electric vehicles, while reducing the cost, weight, and volume of the system.
Date:
January 1, 2008
Creator:
Kelly, K.; Abraham, T.; Bennion, K.; Bharathan, D.; Narumanchi, S. & O'Keefe, M.
Object Type:
Article
System:
The UNT Digital Library
Assessment of Unabated Facility Emission Potentials for Evaluating Airborne Radionuclide Monitoring Requirements at Pacific Northwest National Laboratory - 2007
Assessments were performed to evaluate compliance with the airborne radionuclide emission monitoring requirements in the National Emission Standards for Hazardous Air Pollutants (NESHAP – U.S. Code of Federal Regulations, Title 40, Part 61, Subpart H) and Washington Administrative Code (WAC) 246-247: Radiation Protection – Air Emissions. In these NESHAP assessments, potential unabated offsite doses were evaluated for emission locations at buildings that are part of the consolidated laboratory campus of the Pacific Northwest National Laboratory. This report describes the inventory-based methods and provides the results for the NESHAP assessment performed in 2007.
Date:
January 1, 2008
Creator:
Ballinger, Marcel Y.; Barfuss, Brad C. & Gervais, Todd L.
Object Type:
Report
System:
The UNT Digital Library
An Audit Report on Earned Federal Funds at Selected Agencies
Report of the Texas State Auditor's Office related to the earned federal funds correctly classified and deposited by the Department of Aging and Disability Services (DADS), the Department of Assistive and Rehabilitative Services (DARS), and the Health and Human Services Commission (HHSC), in accordance with the General Appropriations Act and Comptroller of Public Account's Fiscal Policies and Procedures.
Date:
January 2008
Creator:
Texas. Office of the State Auditor.
Object Type:
Report
System:
The Portal to Texas History
Bacteria in Permafrost
Significant numbers of viable ancient microorganisms are known to be present within the permafrost. They have been isolated in both polar regions from the cores up to 400 m deep and ground temperatures of -27 C. The age of the cells corresponds to the longevity of the permanently frozen state of the soils, with the oldest cells dating back to {approx}3 million years in the Arctic, and {approx}5 million years in the Antarctic. They are the only life forms known to have retained viability over geological time. Thawing of the permafrost renews their physiological activity and exposes ancient life to modern ecosystems. Thus, the permafrost represents a stable and unique physicochemical complex, which maintains life incomparably longer than any other known habitats. If we take into account the depth of the permafrost layers, it is easy to conclude that they contain a total microbial biomass many times higher than that of the soil cover. This great mass of viable matter is peculiar to permafrost only.
Date:
January 1, 2008
Creator:
Gilichinsky, David A.; Vishnivetskaya, Tatiana A.; Petrova, Maya A.; Spirina, Elena V.; Mamikin, Vladimir & Rivkina, Elizaveta
Object Type:
Book
System:
The UNT Digital Library
Beam emittance measurements at Fermilab
We give short overview of various beam emittance measurement methods, currently applied at different machine locations for the Run II collider physics program at Fermilab. All these methods are based on beam profile measurements, and we give some examples of the related instrumentation techniques. At the end we introduce a multi-megawatt proton source project, currently under investigation at Fermilab, with respect to the beam instrumentation challenges.
Date:
January 1, 2008
Creator:
Wendt, Manfred; Eddy, Nathan; Hu, Martin; Scarpine, Victor; Syphers, Mike; Tassotto, Gianni et al.
Object Type:
Article
System:
The UNT Digital Library
Border Business Indicators, Volume 32, Number 1, January 2008
Monthly publication documenting statistics related to economic information in the Mexico-Texas border areas including types of border crossings, employment, customs revenues, and other related data.
Date:
January 2008
Creator:
Texas Center for Border Economic and Enterprise Development
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Bridge Facts (FY 2008)
Fact sheet providing statistics about bridges in the state of Texas as of FY 2008.
Date:
2008
Creator:
Texas. Department of Transportation.
Object Type:
Pamphlet
System:
The Portal to Texas History
Brochure for the Dekker Encyclopedia of Nanoscience and Nanotechnology, 2nd edition, 6 volumes set
Brochure for the second edition where the preface states: The science of the ultra small nanoscience has dramatically exploded during the last few years, and the technologies operating with ultra small things the nanotechnologies acquired quickly a firm position in today s world of business, technological development, and public perception. Several factors contributed to the acceleration of scientific knowledge and technological progress in the last decades, among which the rapid development of fast computers, availability of high-resolution analytical techniques, and the progress of molecular biology and genetics are probably the most important. The result was an unprecedented expansion of the frontiers of science, which empowered the human genius with unlimited options of top-down and bottom-up methods for manipulation of materials structure and control of properties at multiple levels, from atomic to molecular, supramolecular, and biomolecular. Already a distinctive mark of 21st century, nanoscience and nanotechnology will certainly have a steadily increasing influence on the quality of life and the environment of this Planet for centuries to come. Dekker Encyclopedia of Nanoscience and Nanotechnology, Second Edition provides a comprehensive and detailed review, from multiple angles, of major developments in the human s quest for understanding and mastering of physical, chemical and …
Date:
January 1, 2008
Creator:
Contescu, Cristian I. & Putyera, Karol
Object Type:
Pamphlet
System:
The UNT Digital Library
Building America Research Benchmark Definition: Updated December 20, 2007
To track progress toward aggressive multi-year whole-house energy savings goals of 40-70% and onsite power production of up to 30%, DOE's Residential Buildings Program and NREL developed the Building America Research Benchmark in consultation with the Building America industry teams. The Benchmark is generally consistent with mid-1990s standard practice, as reflected in the Home Energy Rating System (HERS) Technical Guidelines (RESNET 2002), with additional definitions that allow the analyst to evaluate all residential end-uses, an extension of the traditional HERS rating approach that focuses on space conditioning and hot water. Unlike the reference homes used for HERS, EnergyStar, and most energy codes, the Benchmark represents typical construction at a fixed point in time so it can be used as the basis for Building America's multi-year energy savings goals without the complication of chasing a 'moving target'.
Date:
January 1, 2008
Creator:
Hendron, R.
Object Type:
Report
System:
The UNT Digital Library
Building an Americanization Movement for the Twenty-first Century
A document detailing the Task Force on New Americans impact and constitution. It details information about immigration and diversity.
Date:
2008
Creator:
United States. Department of Homeland Security.
Object Type:
Report
System:
The UNT Digital Library