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Year
Month
U.S. Trade Deficit and the Impact of Rising Oil Prices
None
Date:
December 13, 2006
Creator:
Jackson, James K.
Object Type:
Report
System:
The UNT Digital Library
U.S. Trade Deficit and the Impact of Rising Oil Prices
None
Date:
June 9, 2006
Creator:
Jackson, James K.
Object Type:
Report
System:
The UNT Digital Library
U.S. Trade Deficit and the Impact of Rising Oil Prices
None
Date:
January 20, 2006
Creator:
Jackson, James K.
Object Type:
Report
System:
The UNT Digital Library
U.S. Trade Deficit and the Impact of Rising Oil Prices
None
Date:
March 17, 2006
Creator:
Jackson, James K.
Object Type:
Report
System:
The UNT Digital Library
The U.S. Trade Deficit: Causes, Consequences, and Cures
None
Date:
May 16, 2006
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
The U.S. Trade Deficit: Role of Foreign Governments
The nation’s trade deficit is equal to the imbalance between national investment and national saving. This report discusses several trends in U.S. trade balance and what they mean for the economy.
Date:
July 5, 2006
Creator:
Labonte, Marc & Makinen, Gail
Object Type:
Report
System:
The UNT Digital Library
U.S. Tsunami Preparedness: Federal and State Partners Collaborate to Help Communities Reduce Potential Impacts, but Significant Challenges Remain
A letter report issued by the Government Accountability Office with an abstract that begins "The 2004 Indian Ocean tsunami raised questions about U.S. preparedness for such an event. The National Oceanic and Atmospheric Administration (NOAA) leads U.S. detection and warning efforts and partners with federal and state agencies in the National Tsunami Hazard Mitigation Program (NTHMP) to reduce tsunami risks. In 2005, Congress appropriated $17.24 million in supplemental funding to enhance these efforts. This report (1) identifies U.S. coastal areas facing the greatest tsunami hazard and the extent to which potential impacts have been assessed, (2) discusses the effectiveness of the existing federal tsunami warning system, (3) describes efforts to mitigate the potential impacts of tsunamis on coastal communities, and (4) assesses NOAA's efforts to develop long-range plans for federal tsunami programs."
Date:
June 5, 2006
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
U.S.-Vietnam Relations: Background and Issues for Congress
None
Date:
March 2, 2006
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
U.S.-Vietnam Relations: Background and Issues for Congress
None
Date:
June 30, 2006
Creator:
Manyin, Mark E.
Object Type:
Report
System:
The UNT Digital Library
U.S. Visitor and Immigrant Status Indicator Technology (US-VISIT) Program
This report provides a summary of the statutory history of the automated entry and exit data system, which was renamed the U.S. Visitor and Immigrant Status Indicator Technology (US-VISIT) Program by the Bush Administration. It also discusses other laws that affect the implementation of the system and provides an analysis of the documentary requirements under current law. The report also discusses efforts to implement the program and selected issues associated with its development and implementation.
Date:
January 26, 2006
Creator:
Seghetti, Lisa M. & Viña, Stephen R.
Object Type:
Report
System:
The UNT Digital Library
U-Sries Disequilibra in Soils, Pena Blanca Natural Analog, Chihuahua, Mexico
The Nopal I uranium deposit located in the Sierra Pena Blanca, Mexico. The deposit was mined in the early 1980s, and ore was stockpiled close by. This stockpile area was cleared and is now referred to as the Prior High Grade Stockpile (PHGS). Some of the high-grade boulders from the site rolled downhill when it was cleared in the 1990s. For this study soil samples were collected from the alluvium surrounding and underlying one of these boulders. A bulk sample of the boulder was also collected. Because the Prior High Grade Stockpile had no ore prior to the 1980s a maximum residence time for the boulder is about 25 years, this also means that the soil was at background as well. The purpose of this study is to characterize the transport of uranium series radionuclides from ore to the soil. Transport is characterized by determining the activities of individual radionuclides and daughter to parent ratios. Isotopes of the uranium series decay chain detected include {sup 210}Pb, {sup 234}U, {sup 230}Th, {sup 226}Ra, {sup 214}Pb, and {sup 214}Bi. Peak areas for each isotope are determined using gamma-ray spectroscopy with a Canberra Ge (Li) detector and GENIE 2000 software. The boulder sample …
Date:
March 16, 2006
Creator:
French, D.; Anthony, E. & Goodell, P.
Object Type:
Report
System:
The UNT Digital Library
UA/ORNL Collaboration: Neutron Scattering Studies of Antiferromagnetic Films, Final Report
The work reported here was a collaborative project between the research groups of Dr. J.L. Robertson at Oak Ridge National Laboratory and Dr. G.J. Mankey at the University of Alabama. The main thrust is developing neutron optical devices and materials for the study of magnetic thin films and interfaces. The project is particularly timely, since facility upgrades are currently underway at the High Flux Isotope Reactor. A new neutron optical device, a multicrystal analyzer, was designed and built to take maximum advantage of the increased flux that the upgraded beamlines at HFIR will provide. This will make possible detailed studies of the magnetic structure of thin films, multilayers, and interfaces that are not feasible at present. We performed studies of the antiferromagnetic order in thin films and crystals using neutron scattering, determined magnetic structures at interfaces with neutron reflectometry and measured order in magnetic dispersions using small angle neutron scattering. The collaboration has proved fruitful: generating eleven publications, contributing to the training of a postdoc who is now on staff at the High Flux Isotope Reactor and providing the primary support for two recent Ph.D. recipients. The collaboration is still vibrant, with anticipated implementation of the multicrystal analyzer on one …
Date:
July 26, 2006
Creator:
Mankey, Gary J.
Object Type:
Report
System:
The UNT Digital Library
UCLA/FNPL Underdense Plasma Lens Experiment: Results and Analysis
Focusing of a 15 MeV, 16 nC electron bunch by a gaussian underdense plasma lens operated just beyond the threshold of the underdense condition has been demonstrated. The strong 1.9 cm focal length plasma lens focused both transverse directions simultaneously and reduced the minimum area of the beam spot by a factor of 23. Analysis of the beam envelope evolution observed near the beam waist shows that the spherical aberrations of this underdense lens are lower than those of an overdense plasma lens, as predicted by theory. Time resolved measurements of the focused electron bunch are also reported and compared to simulations.
Date:
August 4, 2006
Creator:
Thompson, M C; Badakov, H; Rosenzweig, J B; Travish, G; Fliller, R; Kazakevich, G M et al.
Object Type:
Article
System:
The UNT Digital Library
UCLA / FNPL underdense plasma lens experiment: Results and analysis
None
Date:
January 1, 2006
Creator:
Thompson, M.C.; Badakov, H.; Rosenzweig, J.B.; Travish, G.; Fliller, R.; Kazakevich, G.M. et al.
Object Type:
Article
System:
The UNT Digital Library
The UCLA/SLAC Ultra-High Gradient Cerenkov Wakefield Accelerator Experiment
An experiment is planned to study the performance of dielectric Cerenkov wakefield accelerating structures at extremely high gradients in the GV/m range. This new UCLA/SLAC/USC collaboration will take advantage of the unique SLAC FFTB electron beam and its demonstrated ultra-short pulse lengths and high currents (e.g., {delta}{sub z} = 20 {micro}m at Q = 3 nC). The electron beam will be focused down and sent through varying lengths of fused silica capillary tubing with two different sizes: ID = 200 {micro}m/OD = 325 {micro}m and ID = 100 {micro}m/OD = 325 {micro}m. The pulse length of the electron beam will be varied in order to alter the accelerating gradient and probe the breakdown threshold of the dielectric structures. In addition to breakdown studies, we plan to collect and measure coherent Cerenkov radiation emitted from the capillary tube to gain information about the strength of the accelerating fields.
Date:
January 25, 2006
Creator:
Thompson, M. C.; Badakov, H.; Rosenzweig, J. B.; Travish, G.; Hogan, M.; Ischebec, R. et al.
Object Type:
Article
System:
The UNT Digital Library
Uganda: Current Conditions and the Crisis in North Uganda
None
Date:
October 20, 2006
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Ukraine: Current Issues and U.S. Policy
None
Date:
June 7, 2006
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Ukraine: Current Issues and U.S. Policy
None
Date:
August 23, 2006
Creator:
Woehrel, Steven
Object Type:
Report
System:
The UNT Digital Library
The Ultimate Networker
Article published in PQ international about Charles Ward, founder of Idea Works Inc.
Date:
2006~
Creator:
unknown
Object Type:
Article
System:
The UNT Digital Library
An Ultra-Bright Pulsed Electron Beam With Low Longitudinal Emittance
Most existing electron sources extract electrons from conductors. Since the actual temperature inside the conductor is much less than the Fermi temperature of the conduction electrons, the electron degeneracy {delta}{sub f} is close to 1, the maximum allowed by the Pauli exclusion principle. However, during extraction several factors conspire together to reduce {delta}{sub f} many orders of magnitude, limiting the achieved values to {approx} 10{sup -5}. A new concept is described for building a novel electron source designed to produce a pulsed beam with {delta}{sub f} {approx} 2 10{sup -3} and longitudinal emittance four orders of magnitude smaller than currently achieved values. This high brightness, low longitudinal emittance regime enables a wide range of novel applications that utilize angstrom-scale spatial resolution and eV-scale energy resolution. The current state of a proof-of-principle experiment conducted at LBNL is also described.
Date:
February 10, 2006
Creator:
Zolotorev, M.; Commins, E. D.; Denes, P.; Hussain, Z.; Lebedev, G. V.; Lidia, S. M. et al.
Object Type:
Article
System:
The UNT Digital Library
Ultra-clean Fischer-Tropsch (F-T) Fuels Production and Demonstration Project
The objective of the DOE-NETL Fischer-Tropsch (F-T) Production and Demonstration Program was to produce and evaluate F-T fuel derived from domestic natural gas. The project had two primary phases: (1) fuel production of ultra-clean diesel transportation fuels from domestic fossil resources; and (2) demonstration and performance testing of these fuels in engines. The project also included a well-to-wheels economic analysis and a feasibility study of small-footprint F-T plants (SFPs) for remote locations such as rural Alaska. During the fuel production phase, ICRC partnered and cost-shared with Syntroleum Corporation to complete the mechanical design, construction, and operation of a modular SFP that converts natural gas, via F-T and hydro-processing reactions, into hydrogensaturated diesel fuel. Construction of the Tulsa, Oklahoma plant started in August 2002 and culminated in the production of over 100,000 gallons of F-T diesel fuel (S-2) through 2004, specifically for this project. That fuel formed the basis of extensive demonstrations and evaluations that followed. The ultra-clean F-T fuels produced had virtually no sulfur (less than 1 ppm) and were of the highest quality in terms of ignition quality, saturation content, backend volatility, etc. Lubricity concerns were investigated to verify that commercially available lubricity additive treatment would be adequate to …
Date:
June 30, 2006
Creator:
Bergin, Stephen P.
Object Type:
Report
System:
The UNT Digital Library
Ultra Deep Wave Equation Imaging and Illumination
In this project we developed and tested a novel technology, designed to enhance seismic resolution and imaging of ultra-deep complex geologic structures by using state-of-the-art wave-equation depth migration and wave-equation velocity model building technology for deeper data penetration and recovery, steeper dip and ultra-deep structure imaging, accurate velocity estimation for imaging and pore pressure prediction and accurate illumination and amplitude processing for extending the AVO prediction window. Ultra-deep wave-equation imaging provides greater resolution and accuracy under complex geologic structures where energy multipathing occurs, than what can be accomplished today with standard imaging technology. The objective of the research effort was to examine the feasibility of imaging ultra-deep structures onshore and offshore, by using (1) wave-equation migration, (2) angle-gathers velocity model building, and (3) wave-equation illumination and amplitude compensation. The effort consisted of answering critical technical questions that determine the feasibility of the proposed methodology, testing the theory on synthetic data, and finally applying the technology for imaging ultra-deep real data. Some of the questions answered by this research addressed: (1) the handling of true amplitudes in the downward continuation and imaging algorithm and the preservation of the amplitude with offset or amplitude with angle information required for AVO studies, (2) …
Date:
September 30, 2006
Creator:
Popovici, Alexander M.; Fomel, Sergey; Sava, Paul; Crawley, Sean; Li, Yining & Lupascu, Cristian
Object Type:
Report
System:
The UNT Digital Library
Ultra-fast Coherent Diffraction Imaging of Single Particles, Clusters and Biomolecules
Theoretical studies and simulations predict that with a very short and very intense coherent X-ray pulse a single diffraction pattern may be recorded from a large macromolecule, a virus, or a cell without the need for crystalline periodicity. Measurement of the over-sampled X-ray diffraction pattern permits phase retrieval and hence structure determination. Although individual samples will be destroyed by the very intense X-ray pulse, a three-dimensional data set could be assembled when copies of a reproducible sample are exposed to the beam one by one. The challenges in carrying out such an experiment requires an interdisciplinary approach, drawing upon structural biology, atomic and plasma physics, mathematics, statistics, and XFEL physics. The potential for breakthrough science in this area is great with impact not only in the biological areas but wherever structural information at or near atomic resolution on the nanoscale is valuable.
Date:
September 27, 2006
Creator:
Hajdu, J & Chapman, H
Object Type:
Report
System:
The UNT Digital Library
Ultra-Fast Pump-Probe Detection Using Plasmas
The temporal resolution of pump-flash interactions in the femtosecond-attosecond (fs-as) regime is limited by the characteristic time constants of the excited states in the detector material. If the relaxation time constant is appreciably longer that the time interval between the pump and probe signals the response of the detector material to the probe represents a temporal convolution with the pump and probe responses, setting a lower limit on the resolution to which the interval between the two pulses can be measured. In most of the solid state ultrafast detection schemes that are being considered for the ultrashort pulse x-ray sources under current development at SLAC and elsewhere the characteristic time constants are related to the bound states of the atoms comprising the material or to the relaxation times of phase transitions or charge carrier populations of the lattice, setting a probable lower limit on the attainable resolution on the order of {approx}0.1 ps. In this paper we consider a novel detection principle based on the excitation of specially prepared unbound states in an ionized plasma with high pump and probe fields, and estimate its potential for extending the lower limit of resolution into the attosecond (as) regime.
Date:
February 17, 2006
Creator:
Tatchyn, R.
Object Type:
Article
System:
The UNT Digital Library