A new first-principles calculation of field-dependent RF surface impedance of BCS superconductor (open access)

A new first-principles calculation of field-dependent RF surface impedance of BCS superconductor

N/A
Date: September 23, 2013
Creator: B., Xiao & Reece, C.
Object Type: Article
System: The UNT Digital Library
International Linear Collider Technical Design Report - Volume 2: Physics (open access)

International Linear Collider Technical Design Report - Volume 2: Physics

None
Date: September 23, 2013
Creator: Baer, Howard; Barklow, Tim; Fujii, Keisuke; Gao, Yuanning; Hoang, Andre; Kanemura, Shinya et al.
Object Type: Report
System: The UNT Digital Library
U.S.-Kenya Relations: Current Political and Security Issues (open access)

U.S.-Kenya Relations: Current Political and Security Issues

This report provides background information regarding on political and security situation in Kenya. The report discusses U.S.-Kenya relations, as U.S. government views Kenya as a strategic partner and anchor state in East Africa, and as critical to counterterrorism efforts in the region.
Date: September 23, 2013
Creator: Blanchard, Lauren Ploch
Object Type: Report
System: The UNT Digital Library
The Millennium Development Goals: The September 2010 U.N. High-level Meeting (open access)

The Millennium Development Goals: The September 2010 U.N. High-level Meeting

This report discusses overarching trends in Millennium Development Goals (MDG) progress and lessons learned from previous and ongoing efforts to achieve them. The MDGs are a group of measurable development targets agreed to by 189 U.N. member states - including the United States - as part of the 2000 Millennium Declaration. The MDGs cover a number of issues, such as eradicating extreme hunger and poverty, combating HIV/AIDS, and promoting gender equality and women's empowerment. This report examines U.S. policy toward the MDGs and how, if at all, the Goals fit into U.S. development and foreign assistance policy. It also examines different schools of thought regarding the effectiveness of the Goals, their role in international development, and their long-term sustainability. This report addresses the MDGs as a whole; it does not assess or analyze issues pertaining to the individual Goals.
Date: September 23, 2010
Creator: Blanchfield, Luisa & Lawson, Marian Leonardo
Object Type: Report
System: The UNT Digital Library
Melt Processed Single Phase Hollandite Waste Forms For Nuclear Waste Immobilization: Ba{sub 1.0}Cs{sub 0.3}A{sub 2.3}Ti{sub 5.7}O{sub 16}; A = Cr, Fe, Al (open access)

Melt Processed Single Phase Hollandite Waste Forms For Nuclear Waste Immobilization: Ba{sub 1.0}Cs{sub 0.3}A{sub 2.3}Ti{sub 5.7}O{sub 16}; A = Cr, Fe, Al

Cs is one of the more problematic fission product radionuclides to immobilize due to its high volatility at elevated temperatures, ability to form water soluble compounds, and its mobility in many host materials. The hollandite structure is a promising crystalline host for Cs immobilization and has been traditionally fabricated by solid state sintering methods. This study presents the structure and performance of Ba{sub 1.0}Cs{sub 0.3}A{sub 2.3}Ti{sub 5.7}O{sub 16}; A = Cr, Fe, Al hollandite fabricated by melt processing. Melt processing is considered advantageous given that melters are currently in use for High Level Waste (HLW) vitrification in several countries. This work details the impact of Cr additions that were demonstrated to i) promote the formation of a Cs containing hollandite phase and ii) maintain the stability of the hollandite phase in reducing conditions anticipated for multiphase waste form processing.
Date: September 23, 2013
Creator: Brinkman, Kyle; Marra, James; Amoroso, Jake; Conradson, Steven D. & Tang, Ming
Object Type: Article
System: The UNT Digital Library
Light-Front Holographic Quantum Chromodynamics (open access)

Light-Front Holographic Quantum Chromodynamics

None
Date: September 23, 2013
Creator: Brodsky, Stanley J.; de Teramond, Guy F. & Dosch, Hans Gunter
Object Type: Article
System: The UNT Digital Library
PTRANSP Tests of TGLF and Predictions for ITER (open access)

PTRANSP Tests of TGLF and Predictions for ITER

A new numerical solver for stiff transport predictions has been developed and implemented in the PTRANSP predictive transport code. The TGLF and GLF23 predictive codes have been incorporated in the solver, verified by comparisons with predictions from the XPTOR code, and validated by comparing predicted and measured profiles. Predictions for ITER baseline plasmas are presented.
Date: September 23, 2012
Creator: Budny, Robert V.; Yuan, Xingqiu; Jardin, S.; Hammett, G.; Staebler, G. & Kinsey, J.
Object Type: Article
System: The UNT Digital Library
Critical Issues in High End Computing - Final Report (open access)

Critical Issues in High End Computing - Final Report

High-End computing (HEC) has been a driver for advances in science and engineering for the past four decades. Increasingly HEC has become a significant element in the national security, economic vitality, and competitiveness of the United States. Advances in HEC provide results that cut across traditional disciplinary and organizational boundaries. This program provides opportunities to share information about HEC systems and computational techniques across multiple disciplines and organizations through conferences and exhibitions of HEC advances held in Washington DC so that mission agency staff, scientists, and industry can come together with White House, Congressional and Legislative staff in an environment conducive to the sharing of technical information, accomplishments, goals, and plans. A common thread across this series of conferences is the understanding of computational science and applied mathematics techniques across a diverse set of application areas of interest to the Nation. The specific objectives of this program are: Program Objective 1. To provide opportunities to share information about advances in high-end computing systems and computational techniques between mission critical agencies, agency laboratories, academics, and industry. Program Objective 2. To gather pertinent data, address specific topics of wide interest to mission critical agencies. Program Objective 3. To promote a continuing discussion …
Date: September 23, 2013
Creator: Corones, James
Object Type: Report
System: The UNT Digital Library
Summary Report: Glass-Ceramic Waste Forms for Combined Fission Products (open access)

Summary Report: Glass-Ceramic Waste Forms for Combined Fission Products

Glass-ceramic waste form development began in FY 2010 examining two combined waste stream options: (1) alkaline earth (CS) + lanthanide (Ln), and (2) + transition metal (TM) fission-product waste streams generated by the uranium extraction (UREX+) separations process. Glass-ceramics were successfully developed for both options however; Option 2 was selected over Option 1, at the conclusion of 2010, because Option 2 immobilized all three waste streams with only a minimal decrease in waste loading. During the first year, a series of three glass (Option 2) were fabricated that varied waste loading-WL (42, 45, and 50 mass%) at fixed molar ratios of CaO/MoO{sub 3} and B{sub 2}O{sub 3}/alkali both at 1.75. These glass-ceramics were slow cooled and characterized in terms of phase assemblage and preliminary irradiation stability. This fiscal year, further characterization was performed on the FY 2010 Option 2 glass-ceramics in terms of: static leach testing, phase analysis by transmission electron microscopy (TEM), and irradiation stability (electron and ion). Also, a new series of glass-ceramics were developed for Option 2 that varied the additives: Al{sub 2}O{sub 3} (0-6 mass%), molar ratio of CaO/MoO{sub 3} and B{sub 2}O{sub 3}/alkali (1.75 to 2.25) and waste loading (50, 55, and 60 mass%). Lastly, …
Date: September 23, 2011
Creator: Crum, Jarrod V.; Riley, Brian J.; Turo, Laura A.; Tang, Ming & Kossoy, Anna
Object Type: Report
System: The UNT Digital Library
Glass Ceramic Waste Forms for Combined CS+LN+TM Fission Products Waste Streams (open access)

Glass Ceramic Waste Forms for Combined CS+LN+TM Fission Products Waste Streams

In this study, glass ceramics were explored as an alternative waste form for glass, the current baseline, to be used for immobilizing alkaline/alkaline earth + lanthanide (CS+LN) or CS+LN+transition metal (TM) fission-product waste streams generated by a uranium extraction (UREX+) aqueous separations type process. Results from past work on a glass waste form for the combined CS+LN waste streams showed that as waste loading increased, large fractions of crystalline phases precipitated upon slow cooling.[1] The crystalline phases had no noticeable impact on the waste form performance by the 7-day product consistency test (PCT). These results point towards the development of a glass ceramic waste form for treating CS+LN or CS+LN+TM combined waste streams. Three main benefits for exploring glass ceramics are: (1) Glass ceramics offer increased solubility of troublesome components in crystalline phases as compared to glass, leading to increased waste loading; (2) The crystalline network formed in the glass ceramic results in higher heat tolerance than glass; and (3) These glass ceramics are designed to be processed by the same melter technology as the current baseline glass waste form. It will only require adding controlled canister cooling for crystallization into a glass ceramic waste form. Highly annealed waste form …
Date: September 23, 2010
Creator: Crum, Jarrod V.; Turo, Laura A.; Riley, Brian J.; Tang, Ming; Kossoy, Anna & Sickafus, Kurt E.
Object Type: Report
System: The UNT Digital Library
Liquid-Water Uptake and Removal in PEM Fuel-Cell Components (open access)

Liquid-Water Uptake and Removal in PEM Fuel-Cell Components

Management of liquid water is critical for optimal fuel-cell operation, especially at low temperatures. It is therefore important to understand the wetting properties and water holdup of the various fuel-cell layers. While the gas-diffusion layer is relatively hydrophobic and exhibits a strong intermediate wettability, the catalyst layer is predominantly hydrophilic. In addition, the water content of the ionomer in the catalyst layer is lower than that of the bulk membrane, and is affected by platinum surfaces. Liquid-water removal occurs through droplets on the surface of the gas-diffusion layer. In order to predict droplet instability and detachment, a force balance is used. While the pressure or drag force on the droplet can be derived, the adhesion or surface-tension force requires measurement using a sliding-angle approach. It is shown that droplets produced by forcing water through the gas-diffusion layer rather than placing them on top of it show much stronger adhesion forces owing to the contact to the subsurface water.
Date: September 23, 2011
Creator: Das, Prodip K.; Gunterman, Haluna P.; Kwong, Anthony & Weber, Adam Z.
Object Type: Article
System: The UNT Digital Library

Characterizing Shading Losses on Partially Shaded PV Systems

Presentation on shaded PV power loss, practical issues with modeling shaded PV, and methods of implementing partially shaded PV modeling.
Date: September 23, 2010
Creator: Deline, C.
Object Type: Presentation
System: The UNT Digital Library
A parametric study of BCS RF surface impedance with magnetic field using the Xiao Code (open access)

A parametric study of BCS RF surface impedance with magnetic field using the Xiao Code

N/A
Date: September 23, 2013
Creator: E., Reece C. & B., Xiao
Object Type: Article
System: The UNT Digital Library
Optimizing Laser-Accelerated Ion Beams for a Collimated Neutron Source (open access)

Optimizing Laser-Accelerated Ion Beams for a Collimated Neutron Source

High-flux neutrons for imaging and materials analysis applications have typically been provided by accelerator- and reactor-based neutron sources. A novel approach is to use ultraintense (>1018W/cm2) lasers to generate picosecond, collimated neutrons from a dual target configuration. In this article, the production capabilities of present and upcoming laser facilities are estimated while independently maximizing neutron yields and minimizing beam divergence. A Monte-Carlo code calculates angular and energy distributions of neutrons generated by D-D fusion events occurring within a deuterated target for a given incident beam of D+ ions. Tailoring of the incident distribution via laser parameters and microlens focusing modifies the emerging neutrons. Projected neutron yields and distributions are compared to conventional sources, yielding comparable on-target fluxes per discharge, shorter time resolution, larger neutron energies and greater collimation.
Date: September 23, 2010
Creator: Ellison, C. L. & Fuchs, J.
Object Type: Report
System: The UNT Digital Library
The Temporary Assistance for Needy Families (TANF) Block Grant: Responses to Frequently Asked Questions (open access)

The Temporary Assistance for Needy Families (TANF) Block Grant: Responses to Frequently Asked Questions

This report provides responses to frequently asked questions about the Temporary Assistance for Needy Families (TANF) block grant. It is intended to serve as a quick reference to provide easy access to information and data. This report does not provide information on TANF program rules.
Date: September 23, 2014
Creator: Falk, Gene
Object Type: Report
System: The UNT Digital Library
Characterization of superconducting samples with SIC system for thin film developments: status and recent results (open access)

Characterization of superconducting samples with SIC system for thin film developments: status and recent results

N/A
Date: September 23, 2013
Creator: G., Eremeev; B., Xiao; Reece, C. & Valente-Feliciano, A.-M.
Object Type: Article
System: The UNT Digital Library
Long-Term Testing of Rhodium-Based Catalysts for Mixed Alcohol Synthesis – 2013 Progress Report (open access)

Long-Term Testing of Rhodium-Based Catalysts for Mixed Alcohol Synthesis – 2013 Progress Report

The U.S. Department of Energy’s Pacific Northwest National Laboratory has been conducting research since 2005 to develop a catalyst for the conversion of synthesis gas (carbon monoxide and hydrogen) into mixed alcohols for use in liquid transportation fuels. Initially, research involved screening possible catalysts based on a review of the literature, because at that time, there were no commercial catalysts available. The screening effort resulted in a decision to focus on catalysts containing rhodium and manganese. Subsequent research identified iridium as a key promoter for this catalyst system. Since then, research has continued to improve rhodium/manganese/iridium-based catalysts, optimizing the relative and total concentrations of the three metals, examining baseline catalysts on alternative supports, and examining effects of additional promoters. Testing was continued in FY 2013 to evaluate the performance and long-term stability of the best catalysts tested to date. Three tests were conducted. A long-term test of over 2300 hr duration at a single set of operating conditions was conducted with the best carbon-supported catalyst. A second test of about 650 hr duration at a single set of operating conditions was performed for comparison using the same catalyst formulation on an alternative carbon support. A third test of about 680 …
Date: September 23, 2013
Creator: Gerber, Mark A.; Gray, Michel J. & Thompson, Becky L.
Object Type: Report
System: The UNT Digital Library
F-35 Joint Strike Fighter (JSF) Program: Background and Issues for Congress (open access)

F-35 Joint Strike Fighter (JSF) Program: Background and Issues for Congress

This report discusses the largest procurement program in the Department of Defense (DOD), the F-35 Joint Strike Fighter (JSF), also called the Lightning II. This is a new aircraft being procured in different versions for the United States Air Force, Marine Corps, and Navy. Current DOD plans call for acquiring a total of 2,456 JSFs. This report also discusses issues related to the F-35 procurement program within the FY2011 defense budget.
Date: September 23, 2010
Creator: Gertler, Jeremiah
Object Type: Report
System: The UNT Digital Library
America COMPETES Acts: FY2008-FY2013 Funding Tables (open access)

America COMPETES Acts: FY2008-FY2013 Funding Tables

This report has been updated to reflect FY2013 funding levels contained in P.L. 113-6 (Consolidated and Further Continuing Appropriations Act, 2013) and the explanatory statement published in the March 11, 2013. This report also provides selected FY2013 current or operational plan funding levels, which have been adjusted to account for the effects of sequestration and other currently known legal determinations made by the Office of Management and Budget (OMB) that may affect the final appropriations levels.
Date: September 23, 2013
Creator: Gonzalez, Heather B.
Object Type: Report
System: The UNT Digital Library
Trade Preferences for Developing Countries and the World Trade Organization (WTO) (open access)

Trade Preferences for Developing Countries and the World Trade Organization (WTO)

This report discusses the trade preferences and General Agreement on Tariffs and Trade (GATT) most-favored-nation (MFN) requirements, World Trade Organization (WTO) waivers for preferential trade agreements, and WTO waivers for U.S. preference programs.
Date: September 23, 2011
Creator: Grimmett, Jeanne J.
Object Type: Report
System: The UNT Digital Library
War Powers Resolution: Presidential Compliance (open access)

War Powers Resolution: Presidential Compliance

Two separate but closely related issues confront Congress each time the President introduces armed forces into a situation abroad that conceivably could lead to their involvement in hostilities. One issue concerns the division of war powers between the President and Congress, whether the use of armed forces falls within the purview of the congressional power to declare war and the War Powers Resolution. The other issue is whether or not Congress concurs in the wisdom of the action. A longer-term issue is whether the War Powers Resolution is an appropriate and effective means of assuring congressional participation in actions that might get the United States involved in war.
Date: September 23, 2010
Creator: Grimmett, Richard F.
Object Type: Report
System: The UNT Digital Library
Whitestone Poncelet RISEC Project Final Technical Report (open access)

Whitestone Poncelet RISEC Project Final Technical Report

This report covers the development of the Poncelet Kinetics RHK100 Prototype. The work was completed by Hasz Consulting, LLC; CE2 Engineers, LLC; Energetic Drives, LLC; and Applied Power and Control all operating as subcontractors to Whitestone Power and Communications during the year from October 1, 2010 to September 23, 2011. As designed, the prototype is run-of-river instream energy conversion (RISEC) system. The design is principally a three-stage undershot water wheel arranged according to the method of General Poncelet. The power train consists of an epicyclic transmission coupled to a permanent magnet generator. The electronic controls system governs the speed of the wheel and rectifies the power signal to enable the system to be integrated with infinite grid infrastructures, to operate in parallel in finite grid applications with other small power productions sources or to operate in stand-alone mode on demand.
Date: September 23, 2011
Creator: Hasz Consulting, LLC; Communications, Whitestone Power and & Engineers, CE2
Object Type: Report
System: The UNT Digital Library
NANA Wind Resource Assessment Program Final Report (open access)

NANA Wind Resource Assessment Program Final Report

NANA Regional Corporation (NRC) of northwest Alaska is located in an area with abundant wind energy resources. In 2007, NRC was awarded grant DE-FG36-07GO17076 by the US Department of Energy's Tribal Energy Program for funding a Wind Resource Assessment Project (WRAP) for the NANA region. The NANA region, including Kotzebue Electric Association (KEA) and Alaska Village Electric Cooperative (AVEC) have been national leaders at developing, designing, building, and operating wind-diesel hybrid systems in Kotzebue (starting in 1996) and Selawik (2002). Promising sites for the development of new wind energy projects in the region have been identified by the WRAP, including Buckland, Deering, and the Kivalina/Red Dog Mine Port Area. Ambler, Shungnak, Kobuk, Kiana, Noorvik & Noatak were determined to have poor wind resources at sites in or very near each community. However, all five of these communities may have better wind resources atop hills or at sites with slightly higher elevations several miles away.
Date: September 23, 2010
Creator: Hermanson, Jay
Object Type: Report
System: The UNT Digital Library
Food Safety in the 111th Congress (open access)

Food Safety in the 111th Congress

This report discusses whether the current food safety system has the resources, authority, and structural organization to safeguard the health of American consumers, who spend more than $1 trillion on food each year. Also at issue is whether federal food safety laws, first enacted in the early 1900s, have kept pace with the significant changes that have occurred in the food production, processing, and marketing sectors since then.
Date: September 23, 2010
Creator: Johnson, Renée
Object Type: Report
System: The UNT Digital Library