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2,229 Matching Results
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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
[5 Days Left To Enter TDNA Awards Contest]
A notice from the Texas Daily Newspaper Associations, which states that the deadline to enter the TDNA Awards is in five days, a January 15 deadline. The document requests that TDNA members pass the notice along to publishers, editors, copy editors, sportswriters, marketing and promotion staff who have worked hard to promote their newspapers to the community that the deadline is soon. The document also details the type of awards that are available. Winners will receive awards at the 2006 TDNA Annual Meeting on Monday, March 20, 2006 at the Renaissance Worthington Hotel in Fort Worth.
Date:
January 10, 2008
Creator:
Texas Daily Newspaper Association
Object Type:
Text
System:
The UNT Digital Library
15th Street News (Midwest City, Okla.), Vol. 37, No. 14, Ed. 1 Friday, January 18, 2008
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
January 18, 2008
Creator:
Pace, Joshua
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
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 American Conference on Theoretical Chemistry
A copy of the of conference Program and the letters of scholarship. Grant was used to present scholarships to students to visit the ACTC conference in 2008.
Date:
January 7, 2008
Creator:
Dickson, Alex; Jadhao, Vikram; Jiang, Ruomu; Jian, Wanyi; McRobbie, Porshcha; Provorse, Makenzie et al.
Object Type:
Text
System:
The UNT Digital Library
21st Century Locomotive Technology: Quarterly Technical Status Report 20 DOE/AL68284-TSR20
advanced fuel injection work is summarized.
Date:
January 31, 2008
Creator:
Salasoo, Lembit; Primus, Roy; Pintgen, Florian; Topinka, Jennifer & Dean, Anthony
Object Type:
Report
System:
The UNT Digital Library
243Am + 48Ca: A Second Look at the Rf/Db Data Set
In December of 2005 a series of experiments were performed at the U400 Cyclotron at the Flerov Laboratory of Nuclear Reactions in Dubna, Russia, using the reaction {sup 243}Am ({sup 48}Ca,3n) {sup 288}115 which, after a sequence of five alpha decays, produces a long-lived ({approx}1d) fission activity that had been detected previously in experiments using the Dubna Gas Filled Recoil Separator (DGFRS). These experiments were attempts to establish the elemental identity of the fissioning species as dubnium (element 105), which in turn confirms the identity of the original parent nucleus as element 115 through genetic correlation of the subsequent alpha decays. A series of approximately 24-hour bombardments were followed by chemical separations designed to isolate the Group Four and Five chemical fractions, and then separate the Nb and Ta fractions, which are Group Five homologues of dubnium and should therefore behave chemically similar. The samples were prepared for alpha and fission measurement and counted for an extended period of time. Fission events were detected in the Ta-like fractions only, which correspond to the fission coming from either the {sup 268}Db isotope directly or long-lived electron-capture decay in {sup 268}Db followed by a short half-life fission of {sup 268}Rf. In May …
Date:
January 29, 2008
Creator:
Henderson, R A & Moody, K J
Object Type:
Report
System:
The UNT Digital Library
[Abilene City Council Minutes: 2008]
Ledger containing minutes of the City Council in Abilene, Texas documenting the group's discussions and activities from January 10, 2008 to December 18, 2008.
Date:
2008-01-10/2008-12-18
Creator:
Abilene (Tex.)
Object Type:
Book
System:
The Portal to Texas History
Absolute Bunch Length Measurements at the ALS by Incoherent Synchrotron Radiation Fluctuation Analysis
By analyzing the pulse to pulse intensity fluctuations of the radiation emitted by a charge particle in the incoherent part of the spectrum, it is possible to extract information about the spatial distribution of the beam. At the Advanced Light Source (ALS) of the Lawrence Berkeley National Laboratory, we have developed and tested a simple scheme based on this principle that allows for the absolute measurement of the bunch length. A description of the method and the experimental results are presented.
Date:
January 24, 2008
Creator:
Filippetto, D.; /Frascati; Sannibale, F.; Zolotorev, Max Samuil; /LBL, Berkeley; Stupakov, G.V. et al.
Object Type:
Article
System:
The UNT Digital Library
AC Losses in the MICE Channel Magnets -- Is This a Curse or aBlessing?
This report discusses the AC losses in the MICE channelmagnets during magnet charging and discharging. This report talks aboutthe three types of AC losses in the MICE magnets; the hysteretic AC lossin the superconductor, the coupling AC loss in the superconductor and theeddy current AC loss in the magnet mandrel and support structure. AClosses increase the heat load at 4 K. The added heat load increases thetemperature of the second stage of the cooler. In addition, AC losscontributes to the temperature rise between the second stage cold headand the high field point of the magnet, which is usually close to themagnet hot spot. These are the curses of AC loss in the MICE magnet thatcan limit the rate at which the magnet can be charge or discharged. Ifone is willing to allow some of the helium that is around the magnet toboil away during a magnet charge or discharge, AC losses can become ablessing. The boil off helium from the AC losses can be used to cool theupper end of the HTS leads and the surrounding shield. The AC losses arepresented for all three types of MICE magnets. The AC loss temperaturedrops within the coupling magnet are presented as an …
Date:
January 31, 2008
Creator:
Green, M. A.; Wu, H.; Wang, L.; Kai, L. L.; Jia, L. X. & Yang, S. Q.
Object Type:
Report
System:
The UNT Digital Library
ACCELERATED-AGING OF SHIPPING PACKAGE O-RINGS FOR PU STORAGE
The Savannah River Site (SRS) is storing surplus plutonium (Pu) materials in the K-Area Materials Storage (KAMS) facility. The Pu materials are packaged per the DOE 3013 Standard. The nested, welded 300 series stainless steel 3013 containers are transported to KAMS in Type B shipping packages and subsequently stored in the same packages. These type B shipping packages consist of double containment vessels sealed with dual O-rings. The O-ring compound is Parker Seals V0835-75, based on Viton{reg_sign} GLT fluoroelastomer. This work evaluates the performance of the V0835-75 O-rings at accelerated-aging conditions. The results will be used to develop a lifetime prediction model for O-rings in KAMS.
Date:
January 10, 2008
Creator:
Hoffman, E
Object Type:
Article
System:
The UNT Digital Library
[Acme Brick sign at Men's Basketball game, January 31, 2008]
Photograph of students and the court entrance during a Men's Basketball game between UNT and the University of South Alabama. Some of the students are wearing hats that look like basketballs and one is wearing an old uniform and a cowboy hat. One is also holding out an "Acme Brick" sign.
Date:
January 31, 2008
Creator:
Ha, Khai
Object Type:
Photograph
System:
The UNT Digital Library
ACRF Instrumentation Status: New, Current, and Future - January 2008
The purpose of this report is to provide status of the ingest software used to process instrument data for the Atmospheric Radiation Measurement Program Climate Research Facility (ACRF). The report is divided into 4 sections: (1) for news about ingests currently under development, (2) for current production ingests, (3) for future ingest development plans, and (4) for information on retired ingests. Please note that datastreams beginning in “xxx” indicate cases where ingests run at multiple ACRF sites, which results in a datastream(s) for each location.
Date:
January 31, 2008
Creator:
Koontz, A. S.; Choudhury, S.; Ermold, B. D. & Gaustad, K. L.
Object Type:
Report
System:
The UNT Digital Library
Active RF Pulse Compression using Electrically Controlled Semiconductor Switches
In this paper, we will present our recent results on the research of the ultra-fast high power RF switches based on silicon. We have developed a switch module at X-band which can use a silicon window as the switch. The switching is realized by generation of carriers in the bulk silicon. The carriers can be generated electrically or/and optically. The electrically controlled switches use PIN diodes to inject carrier. We have built the PIN diode switches at X-band, with <300ns switching time. The optically controlled switches use powerful lasers to excite carriers. By combining the laser excitation and electrical carrier generation, significant reduction in the required power of both the laser and the electrical driver is expected. High power test is under going.
Date:
January 30, 2008
Creator:
Guo, J. & Tantawi, S. G.
Object Type:
Article
System:
The UNT Digital Library
Adaptive Localization Regions for O(N) Density Functional Theory
A linear scaling approach for general and accurate pseudopotential Density Functional Theory calculations is presented. It is based on a Finite Difference discretization. Effective O(N) scaling is achieved by confining the orbitals in spherical localization regions. To improve accuracy and flexibility while computing the smallest possible number of orbitals, we propose an algorithm to adapt localization regions during computation. Numerical results for a polyacethylene chain and a magnesium oxide ring are presented.
Date:
January 15, 2008
Creator:
Fattebert, J
Object Type:
Article
System:
The UNT Digital Library
Adding a User Developed Vocabulary in DSpace
Poster presented at the 2008 ALISE Annual Conference. This poster discusses adding a user developed vocabulary in DSpace.
Date:
January 2008
Creator:
Polyakov, Serhiy; Xu, Hong & Moen, William E.
Object Type:
Poster
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
Addressing the Need for Alternative Transportation Fuels: The Joint BioEnergy Institute
Today, carbon-rich fossil fuels, primarily oil, coal, and natural gas, provide 85% of the energy consumed in the U.S. As world demand increases, oil reserves may become rapidly depleted. Fossil fuel use increases CO{sub 2} emissions and raises the risk of global warming. The high energy content of liquid hydrocarbon fuels makes them the preferred energy source for all modes of transportation. In the U.S. alone, transportation consumes >13.8 million barrels of oil per day and generates 0.5 gigatons of carbon per year. This release of greenhouse gases has spurred research into alternative, nonfossil energy sources. Among the options (nuclear, concentrated solar thermal, geothermal, hydroelectric, wind, solar, and biomass), only biomass has the potential to provide a high-energy-content transportation fuel. Biomass is a renewable resource that can be converted into carbon-neutral transporation fuels. Currently, biofuels such as ethanol are produced largely from grains, but there is a large, untapped resource (estimated at more than a billion tons per year) of plant biomass that could be utilized as a renewable, domestic source of liquid fuels. Well-established processes convert the starch content of the grain into sugars that can be fermented to ethanol. The energy efficiency of starch-based biofuels is however not …
Date:
January 18, 2008
Creator:
Blanch, Harvey; Adams, Paul; Andrews-Cramer, Katherine; Frommer, Wolf; Simmons, Blake & Keasling, Jay
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
Advanced Integration in Multi-Scale Mechanics and Welding Process Simulation in Weld Integrity Assessment
In this project, mathematical models that predict the microstructure in pipeline steel welds were to be developed. These models were to be integrated with thermal models that describe the time-temperature history in the weld as a function of location in order to derive the spatial variation of microstructure in the weld. The microstructure predictions were also to be combined with microstructure-hardness relations, based on the additivity principle, to determine the spatial variation of hardness in the weld. EMC2 also developed microstructural models based on empirical relationships. ORNL was to pursue the development of more fundamental, theoretically based models. ORNL applied a previously developed model for inclusion formation to predict the extent and nature of inclusions that form during weld cooling from the liquid. This inclusion model was directly integrated with computational thermodynamics capability. A convenient user interface was developed for both the inclusion model and the thermodynamic phase-stability calculations. The microstructure model was based on the simultaneous transformation theory analysis as applied to the transformation of austenite to various ferrite constituents during weld cooling. The model available on the Materials Algorithm Project web site was used. Extensive modification of this model was required to correct problems with compilation and calculations …
Date:
January 30, 2008
Creator:
Vitek, J.M.; Wilkowski, G.M.; Brust, F.W. & Babu, S.
Object Type:
Report
System:
The UNT Digital Library
The Advanced Technology Program
President Bush's FY2008 budget request did not include financing for ATP. The FY2008 Consolidated Appropriations Act, P.L. 110-161, replaces ATP with the Technology Innovation Program (TIP) and provides $65.2 million (with an additional $5 million in ATP FY2007 unobligated balances), 17.6% less than the previous fiscal year. P.L. 110- 69, the America COMPETES Act, authorized the creation of TIP.
Date:
January 7, 2008
Creator:
Schacht, Wendy H.
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
Afghanistan: Narcotics and U.S. Policy
This report provides current statistical information, profiles the Afghanistan narcotics trade's participants, explores linkages between narcotics, insecurity, and corruption, and reviews U.S. and international policy responses since late 2001. The report also considers ongoing policy debates regarding the counternarcotics role of coalition military forces, poppy eradication, alternative livelihoods, and funding issues for Congress.
Date:
January 24, 2008
Creator:
Blanchard, Christopher M.
Object Type:
Report
System:
The UNT Digital Library