The Global Economic Crisis: Impact on Sub-Saharan Africa and Global Policy Responses (open access)

The Global Economic Crisis: Impact on Sub-Saharan Africa and Global Policy Responses

This report analyzes Africa's vulnerability to the global crisis and potential implications for economic growth, poverty alleviation, fiscal balances, and political stability. The report describes channels through which the crisis is affecting Africa, and provides information on international efforts to address the impact, including U.S. policies and those of multilateral institutions in which the United States plays a major role.
Date: April 6, 2010
Creator: Arieff, Alexis; Weiss, Martin A. & Jones, Vivian C.
Object Type: Report
System: The UNT Digital Library
Detection of Hohlraum Target Position for Laser Fusion Experiments (open access)

Detection of Hohlraum Target Position for Laser Fusion Experiments

None
Date: July 6, 2010
Creator: Awwal, A. A.
Object Type: Article
System: The UNT Digital Library
Image Processing and Control of a Programmable Spatial Light Modulator for Optic Damage Protection (open access)

Image Processing and Control of a Programmable Spatial Light Modulator for Optic Damage Protection

The heart of the National Ignition Facility is a megajoule-class laser system consisting of 192 beams used to drive inertial confinement fusion reactions. A recently installed system of programmable, liquid-crystal-based spatial light modulators adds the capability of arbitrarily shaping the spatial beam profiles in order to enhance operational flexibility. Its primary intended use is for introducing 'blocker' obscurations shadowing isolated flaws on downstream optical elements that would otherwise be damaged by high fluence laser illumination. Because an improperly shaped blocker pattern can lead to equipment damage, both the position and shape of the obscurations must be carefully verified prior to high-fluence operations. An automatic alignment algorithm is used to perform detection and estimation of the imposed blocker centroid positions compared to their intended locations. Furthermore, in order to minimize the spatially-varying nonlinear response of the device, a calibration of the local magnification is performed at multiple sub-image locations. In this paper, we describe the control and associated image processing of this device that helps to enhance the safety and longevity of the overall system.
Date: December 6, 2010
Creator: Awwal, A.; Leach, R.; Brunton, G.; Tse, E.; Matone, J. & Heebner, J.
Object Type: Article
System: The UNT Digital Library
TANK 40 FINAL SB5 CHEMICAL CHARACTERIZATION RESULTS PRIOR TO NP ADDITION (open access)

TANK 40 FINAL SB5 CHEMICAL CHARACTERIZATION RESULTS PRIOR TO NP ADDITION

A sample of Sludge Batch 5 (SB5) was pulled from Tank 40 in order to obtain radionuclide inventory analyses necessary for compliance with the Waste Acceptance Product Specifications (WAPS). This sample was also analyzed for chemical composition including noble metals. Prior to radionuclide inventory analyses, a final sample of the H-canyon Np stream will be added to bound the Np addition anticipated for Tank 40. These analyses along with the WAPS radionuclide analyses will help define the composition of the sludge in Tank 40 that is currently being fed to DWPF as SB5. At the Savannah River National Laboratory (SRNL) the 3-L Tank 40 SB5 sample was transferred from the shipping container into a 4-L high density polyethylene vessel and solids allowed to settle overnight. Supernate was then siphoned off and circulated through the shipping container to complete the transfer of the sample. Following thorough mixing of the 3-L sample, a 239 g sub-sample was removed. This sub-sample was then utilized for all subsequent analytical samples. Eight separate aliquots of the slurry were digested, four with HNO{sub 3}/HCl (aqua regia) in sealed Teflon{reg_sign} vessels and four in Na{sub 2}O{sub 2} (alkali or peroxide fusion) using Zr crucibles. Due to the …
Date: January 6, 2010
Creator: Bannochie, C. & Click, D.
Object Type: Report
System: The UNT Digital Library
Nondestructive depth-resolved spectroscopic investigation of the heavily intermixed In2S3/Cu(In,Ga)Se2 interface (open access)

Nondestructive depth-resolved spectroscopic investigation of the heavily intermixed In2S3/Cu(In,Ga)Se2 interface

The chemical structure of the interface between a nominal In2S3 buffer and a Cu(In,Ga)Se2 (CIGSe) thin-film solar cell absorber was investigated by soft x-ray photoelectron and emission spectroscopy. We find a heavily intermixed, complex interface structure, in which Cu diffuses into (and Na through) the buffer layer, while the CIGSe absorber surface/interface region is partially sulfurized. Based on our spectroscopic analysis, a comprehensive picture of the chemical interface structure is proposed.
Date: April 6, 2010
Creator: Bar, Marcus; Barreau, N.; Couzinie-Devy, F.; Pookpanratana, S.; Klaer, J.; Blum, M. et al.
Object Type: Article
System: The UNT Digital Library
FY2010 Supplemental for Wars, Disaster Assistance, Haiti Relief, and Other Programs (open access)

FY2010 Supplemental for Wars, Disaster Assistance, Haiti Relief, and Other Programs

This report discusses the humanitarian relief funding, the Haiti FY2010 supplemental proposal, and other foreign economic and humanitarian assistance, as well as other domestic program funding.
Date: August 6, 2010
Creator: Belasco, Amy; Else, Daniel H.; Lindsay, Bruce R.; Margesson, Rhoda; Nakamura, Kennon H.; Taft-Morales, Maureen et al.
Object Type: Report
System: The UNT Digital Library
Dynamical Layer Decoupling in a Stripe-ordered, High T_c Superconductor (open access)

Dynamical Layer Decoupling in a Stripe-ordered, High T_c Superconductor

In the stripe-ordered state of a strongly-correlated two-dimensional electronic system, under a set of special circumstances, the superconducting condensate, like the magnetic order, can occur at a non-zero wave-vector corresponding to a spatial period double that of the charge order. In this case, the Josephson coupling between near neighbor planes, especially in a crystal with the special structure of La{sub 2-x}Ba{sub x}CuO{sub 4}, vanishes identically. We propose that this is the underlying cause of the dynamical decoupling of the layers recently observed in transport measurements at x = 1/8.
Date: April 6, 2010
Creator: Berg, E.
Object Type: Article
System: The UNT Digital Library
Intelligence Issues for Congress (open access)

Intelligence Issues for Congress

This report discusses the efforts currently underway to improve coordination and encourage better analysis amongst the various agencies within the U.S. Intelligence Community, especially with regard to the ongoing and prominent issue of international terrorism. In particular, this report addresses the false intelligence regarding Iraqi weapons of mass destruction and the current efforts in Iraq and Iran in general.
Date: August 6, 2010
Creator: Best, Richard A., Jr.
Object Type: Report
System: The UNT Digital Library
Intelligence Issues for Congress (open access)

Intelligence Issues for Congress

This report discusses the efforts currently underway to improve coordination and encourage better analysis amongst the various agencies within the U.S. Intelligence Community, especially with regard to the ongoing and prominent issue of international terrorism. In particular, this report addresses the false intelligence regarding Iraqi weapons of mass destruction and the current efforts in Iraq and Iran in general.
Date: August 6, 2010
Creator: Best, Richard A., Jr.
Object Type: Report
System: The UNT Digital Library
Self-consistent solution for proximity effect and Josephson current in ballistic graphene SNS Josephson junctions (open access)

Self-consistent solution for proximity effect and Josephson current in ballistic graphene SNS Josephson junctions

We use a tight-binding Bogoliubov-de Gennes (BdG) formalism to self-consistently calculate the proximity effect, Josephson current, and local density of states in ballistic graphene SNS Josephson junctions. Both short and long junctions, with respect to the superconducting coherence length, are considered, as well as different doping levels of the graphene. We show that self-consistency does not notably change the current-phase relationship derived earlier for short junctions using the non-selfconsistent Dirac-BdG formalism but predict a significantly increased critical current with a stronger junction length dependence. In addition, we show that in junctions with no Fermi level mismatch between the N and S regions superconductivity persists even in the longest junctions we can investigate, indicating a diverging Ginzburg-Landau superconducting coherence length in the normal region.
Date: April 6, 2010
Creator: Black-Schaffer, Annica M.
Object Type: Article
System: The UNT Digital Library
Abortion and Family Planning-Related Provisions in U.S. Foreign Assistance Legislation and Policy (open access)

Abortion and Family Planning-Related Provisions in U.S. Foreign Assistance Legislation and Policy

This report details legislation and policies that restrict or place requirements on U.S. funding of abortion or family planning activities abroad. The level and extent of federal funding for these activities is an ongoing and controversial issue in U.S. foreign assistance and will likely continue to be a point of contention during the 111th Congress.
Date: August 6, 2010
Creator: Blanchfield, Luisa
Object Type: Report
System: The UNT Digital Library
The United Nations Convention on the Rights of the Child: Background and Policy Issues (open access)

The United Nations Convention on the Rights of the Child: Background and Policy Issues

This report provides an overview of CRC's background and structure and examines evolving U.S. policy toward the Convention, including past and current Administration positions and congressional perspectives.
Date: December 6, 2010
Creator: Blanchfield, Luisa
Object Type: Report
System: The UNT Digital Library
War in Afghanistan: Strategy, Military Operations, and Issues for Congress (open access)

War in Afghanistan: Strategy, Military Operations, and Issues for Congress

The character of the war in Afghanistan evolved from a violent struggle against al Qaeda and its Taliban supporters to a multi-faceted counterinsurgency (COIN) effort. This report provides an examination of the war's background, context, and early execution; an analytical discussion of the COIN war to date, including strategy, organization, participation, and key facets of the effort including population security, advising the Afghan National Security Forces (ANSF), counter-narcotics, reconciliation, community outreach, and civil-military coordination; and an analysis of major strategic and operational issues and options that the 111th Congress may opt to consider.
Date: May 6, 2010
Creator: Bowman, Steve & Dale, Catherine
Object Type: Report
System: The UNT Digital Library
Biomass Feedstocks for Biopower: Background and Selected Issues (open access)

Biomass Feedstocks for Biopower: Background and Selected Issues

The production of bioenergy - renewable energy derived from biomass - could potentially increase national energy security, reduce greenhouse gas emissions, and contribute to rural economic growth. This report provides analyses of commonly discussed biomass feedstocks and their relative potential for power generation. Additional biopower issues - feedstock accessibility, the biomass power plant carbon-neutrality debate, and unintended consequences of legislative activities to promote bioenergy - are also discussed.
Date: October 6, 2010
Creator: Bracmort, Kelsi
Object Type: Report
System: The UNT Digital Library
Layed Perovskite PRBA0.5SR0.5CO205 as High Performance Cathode for Solid Oxide Fuels Using Photon Conducting Electrolyte (open access)

Layed Perovskite PRBA0.5SR0.5CO205 as High Performance Cathode for Solid Oxide Fuels Using Photon Conducting Electrolyte

This paper discusses solid oxide fuel cells, proton conductors, layered perovskite and Cathodes.
Date: May 6, 2010
Creator: Brinkman, K.
Object Type: Article
System: The UNT Digital Library
The Stability and Electrical Properties of High Temperature Proton Conductors (open access)

The Stability and Electrical Properties of High Temperature Proton Conductors

The morphological and electrical properties of Ba{sub 1-x}Sr{sub x}Ce{sub 0.8}Y{sub 0.2}O{sub 3-{delta}} with x varying from 0 to 1 prepared by a modified Pechini method were investigated as potential high temperature proton conductors. Dense microstructures were achieved for all the samples upon sintering at 1500 C for 5 h. The phase structure analysis indicated that perovskite phase was formed for 0 {le} x {le} 0.2, while for x larger than 0.5, impurity phases of Sr{sub 2}CeO{sub 4} and Y{sub 2}O{sub 3} appeared. The tolerance to H{sub 2}O for the samples improved with the increase in Sr content when exposed to boiling water, while the electrical conductivity decreased from x = 0 to 1. However, the resistance to CO{sub 2} attack at elevated temperatures was not improved within the whole x range studied.
Date: July 6, 2010
Creator: Brinkman, K.
Object Type: Article
System: The UNT Digital Library
Development of Sensors and Sensing Technology for Hydrogen Fuel Cell Vehicle Applications (open access)

Development of Sensors and Sensing Technology for Hydrogen Fuel Cell Vehicle Applications

One related area of hydrogen fuel cell vehicle (FCV) development that cannot be overlooked is the anticipated requirement for new sensors for both the monitoring and control of the fuel cell's systems and for those devices that will be required for safety. Present day automobiles have dozens of sensors on-board including those for IC engine management/control, sensors for state-of-health monitoring/control of emissions systems, sensors for control of active safety systems, sensors for triggering passive safety systems, and sensors for more mundane tasks such as fluids level monitoring to name the more obvious. The number of sensors continues to grow every few years as a result of safety mandates but also in response to consumer demands for new conveniences and safety features. Some of these devices (e.g. yaw sensors for dynamic stability control systems or tire presure warning RF-based devices) may be used on fuel cell vehicles without any modification. However the use of hydrogen as a fuel will dictate the development of completely new technologies for such requirements as the detection of hydrogen leaks, sensors and systems to continuously monitor hydrogen fuel purity and protect the fuel cell stack from poisoning, and for the important, yet often taken for granted, …
Date: January 6, 2010
Creator: Brosha, E. L.; Sekhar, P. K.; Mukundan, R.; Williamson, T.; Garzon, F. H.; Woo, L. Y. et al.
Object Type: Article
System: The UNT Digital Library
Immigration Legislation and Issues in the 111th Congress (open access)

Immigration Legislation and Issues in the 111th Congress

The 111th Congress has considered various immigration issues and has enacted a number of targeted immigration provisions. It has passed legislation to extend the life of several immigration programs--the E-Verify electronic employment eligibility verification system, the Immigrant Investor Regional Center Program, the Conrad State J-1 Waiver Program, and the special immigrant visa for religious workers--all of which are currently authorized until September 30, 2012. Among the other subjects of legislation enacted by this Congress are refugees and border security. This report discusses these and other immigration-related issues that have seen legislative action or are of significant congressional interest.
Date: May 6, 2010
Creator: Bruno, Andorra; Ester, Karma; Haddal, Chad C.; Kim, Yule; Lee, Margaret Mikyung; Siskin, Alison et al.
Object Type: Report
System: The UNT Digital Library
Asian Carp and the Great Lakes Region (open access)

Asian Carp and the Great Lakes Region

This report provides an overview of four species of non-indigenous Asian carp that are expanding their range in U.S. waterways, resulting in a variety of concerns and problems. This report details the environmental and economic threats from this invasion, as well as ways to combat the spread of Asian carp in U.S. water.
Date: August 6, 2010
Creator: Buck, Eugene H.; Upton, Harold F.; Stern, Charles V. & Nichols, James E.
Object Type: Report
System: The UNT Digital Library
Benefits and Costs of Aggressive Energy Efficiency Programs and the Impacts of Alternative Sources of Funding: Case Study of Massachusetts (open access)

Benefits and Costs of Aggressive Energy Efficiency Programs and the Impacts of Alternative Sources of Funding: Case Study of Massachusetts

Increased interest by state (and federal) policymakers and regulatory agencies in pursuing aggressive energy efficiency efforts could deliver significant utility bill savings for customers while having long-term implications for ratepayers (e.g. potential rate impacts). Equity and distributional concerns associated with the authorized recovery of energy efficiency program costs may necessitate the pursuit of alternative program funding approaches. In 2008, Massachusetts passed the Green Communities Act which directed its energy efficiency (EE) program administrators to obtain all cost-effective EE resources. This goal has translated into achieving annual electric energy savings equivalent to a 2.4% reduction in retail sales from energy efficiency programs in 2012. Representatives of electricity consumer groups supported the new portfolio of EE programs (and the projected bill savings) but raised concerns about the potential rate impacts associated with achieving such aggressive EE goals, leading policymakers to seek out alternative funding sources which can potentially mitigate these effects. Utility administrators have also raised concerns about under-recovery of fixed costs when aggressive energy efficiency programs are pursued and have proposed ratemaking policies (e.g. decoupling) and business models that better align the utility's financial interests with the state's energy efficiency public policy goals. Quantifying these concerns and identifying ways they can …
Date: August 6, 2010
Creator: Cappers, Peter; Satchwell, Andrew; Goldman, Charles & Schlegel, Jeff
Object Type: Report
System: The UNT Digital Library
Japan-U.S. Relations: Issues for Congress (open access)

Japan-U.S. Relations: Issues for Congress

This report discusses the relationship between the United States and Japan, including Japanese efforts to support the U.S. in the wake of the September 11th, 2001 terrorist attacks and the two countries' economic ties, especially with regards to the recent economic downturn. This report also discusses the general political atmosphere of Japan, including the recent and ongoing political turmoil in Tokyo.
Date: October 6, 2010
Creator: Chanlett-Avery, Emma; Cooper, William H. & Manyin, Mark E.
Object Type: Report
System: The UNT Digital Library
Erratum: Time-step Considerations in Particle Simulation Algorithms for Coulomb Collisions in Plasmas [B.I. Cohen, A. M. Dimits, A. Friedman, and R. E. Caflisch, IEEE Trans. Plasma Sci. 38, 2394 (2010)] (open access)

Erratum: Time-step Considerations in Particle Simulation Algorithms for Coulomb Collisions in Plasmas [B.I. Cohen, A. M. Dimits, A. Friedman, and R. E. Caflisch, IEEE Trans. Plasma Sci. 38, 2394 (2010)]

None
Date: October 6, 2010
Creator: Cohen, B. I.; Dimits, A. M.; Friedman, A. & Caflisch, R.
Object Type: Article
System: The UNT Digital Library
The Uniformed and Overseas Citizens Absentee Voting Act: Overview and Issues (open access)

The Uniformed and Overseas Citizens Absentee Voting Act: Overview and Issues

This report discusses the Uniformed and Overseas Citizens Absentee Voting Act (UOCAVA), under which members of the uniformed services and U.S. citizens who live abroad are eligible to register and vote absentee in federal elections. The report discusses recent improvements to UOCAVA, necessary as teh result of controversy surrounding ballots received in Florida from absentee voters in the 2000 presidential election. The report also discusses related legislation, such as the National Defense Authorization Act for FY2010, which provided for a major overhaul of UOCAVA.
Date: October 6, 2010
Creator: Coleman, Kevin J.
Object Type: Report
System: The UNT Digital Library
The Uniformed and Overseas Citizens Absentee Voting Act: Overview and Issues (open access)

The Uniformed and Overseas Citizens Absentee Voting Act: Overview and Issues

This report discusses the Uniformed and Overseas Citizens Absentee Voting Act (UOCAVA), under which members of the uniformed services and U.S. citizens who live abroad are eligible to register and vote absentee in federal elections. The report discusses recent improvements to UOCAVA, necessary as the result of controversy surrounding ballots received in Florida from absentee voters in the 2000 presidential election. The report also discusses related legislation, such as the National Defense Authorization Act for FY2010, which provided for a major overhaul of UOCAVA.
Date: December 6, 2010
Creator: Coleman, Kevin J.
Object Type: Report
System: The UNT Digital Library