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593 Matching Results
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Imaging the molecular dynamics of dissociative electron attachment to water
Momentum imaging experiments on dissociative electron attachment to the water molecule are combined with ab initio theoretical calculations of the angular dependence of the quantum mechanical amplitude for electron attachment to provide a detailed picture of the molecular dynamics of dissociation attachment via the two lowest energy Feshbach resonances. The combination of momentum imaging experiments and theory can reveal dissociation dynamics for which the axial recoil approximation breaks down and thus provides a powerful reaction microscope for DEA to polyatomics.
Date:
October 19, 2009
Creator:
Adaniya, Hidihito; Rudek, B.; Osipov, Timur; Haxton, Dan; Weber, Thorsten; Rescigno, Thomas N. et al.
Object Type:
Article
System:
The UNT Digital Library
Trade and the Americas
At the 1994 Summit of the Americas, 34 hemispheric democracies agreed to create a “Free Trade Area of the Americas” (FTAA) no later than 2005. If created, the FTAA would be a $13 trillion market of 34 countries (Cuba is not included) and nearly 800 million people. The population alone would make it the largest free trade area in the world with nearly twice the 450 million population of the now 25-nation European Union. In the nearly ten years following the 1994 summit, Western Hemisphere trade ministers have met eight times to advance the negotiating process. At the last ministerial held from November 17- 20 2003 in Miami, ministers agreed to a declaration that set a September 2004 deadline for the market access talks, created a two-tiered FTAA structure, and reaffirmed countries’ commitment to complete the entire FTAA by January 2005.
Date:
October 19, 2004
Creator:
Ahearn, Raymond J.
Object Type:
Report
System:
The UNT Digital Library
Timpson & Tenaha News (Timpson, Tex.), Vol. 21, No. 42, Ed. 1 Thursday, October 19, 2006
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
October 19, 2006
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Waste Package Corrosion Studies Using Small Mockup Experiments
The corrosion of spent nuclear fuel and subsequent mobilization of radionuclides is of great concern in a geologic repository, particularly if conditions are oxidizing. Corroding A516 steel may offset these transport processes within the proposed waste packages at the Yucca Mountain Repository (YMR) by retaining radionuclides, creating locally reducing conditions, and reducing porosity. Ferrous iron, Fe{sup 2+}, has been shown to reduce UO{sub 2}{sup 2+} to UO{sub 2(s)} [1], and some ferrous iron-bearing ion-exchange materials adsorb radionuclides and heavy metals [2]. Of particular interest is magnetite, a potential corrosion product that has been shown to remove TcO{sub 4}{sup -} from solution [3]. Furthermore, if Fe{sup 2+} minerals, rather than fully oxidized minerals such as goethite, are produced during corrosion, then locally reducing conditions may be present. High electron availability leads to the reduction and subsequent immobilization of problematic dissolved species such as TcO{sub 4}{sup -}, NpO{sub 2}{sup +}, and UO{sub 2}{sup 2+} and can also inhibit corrosion of spent nuclear fuel. Finally, because the molar volume of iron material increases during corrosion due to oxygen and water incorporation, pore space may be significantly reduced over long time periods. The more water is occluded, the bulkier the corrosion products, and the …
Date:
October 19, 2005
Creator:
Anderson, B. E.; Helean, K. B.; Bryan, C. R.; Brady, P. V. & Ewing, R. C.
Object Type:
Report
System:
The UNT Digital Library
A Dynamically Adaptive Arbitrary Lagrangian-Eulerian Method for Hydrodynamics
A new method that combines staggered grid Arbitrary Lagrangian-Eulerian (ALE) techniques with structured local adaptive mesh refinement (AMR) has been developed for solution of the Euler equations. The novel components of the combined ALE-AMR method hinge upon the integration of traditional AMR techniques with both staggered grid Lagrangian operators as well as elliptic relaxation operators on moving, deforming mesh hierarchies. Numerical examples demonstrate the utility of the method in performing detailed three-dimensional shock-driven instability calculations.
Date:
October 19, 2002
Creator:
Anderson, R W; Pember, R B & Elliott, N S
Object Type:
Article
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 105, No. 184, Ed. 1 Sunday, October 19, 2003
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
October 19, 2003
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 106, No. 172, Ed. 1 Tuesday, October 19, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
October 19, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
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:
October 19, 2009
Creator:
Arieff, Alexis; Weiss, Martin A. & Jones, Vivian C.
Object Type:
Report
System:
The UNT Digital Library
Packaging Design Criteria for the Steel Waste Package
This packaging design criteria provides the criteria for the design, fabrication, safety evaluation, and use of the steel waste package (SWP) to transport remote-handled waste and special-case waste from the 324 facility to Central Waste Complex (CWC) for interim storage.
Date:
October 19, 2000
Creator:
BOEHNKE, W.M.
Object Type:
Report
System:
The UNT Digital Library
LCLS soft x-ray imager mirrors and their performance
Soft X-ray imager mirrors have been designed, calibrated and fabricated at Lawrence Livermore National Laboratory and characterized at the Advanced Light Source for their performance between 200 and 1300 eV. The mirrors are coated with a multilayer coating consisting of 70 bilayers of W/ SiC. The mirrors are to reflect at 22.5 deg from grazing angle at 1.50 nm wavelength and the width of the reflectivity peak should be at least 1.3%. Also, the mirrors should be non-reflective elsewhere. Our multilayer design was optimized to satisfy these requirements. The coating is very challenging since the individual layer thicknesses need to be less than 1 nm thick and reproducibility from layer to layer is crucial. To minimize the second harmonic peak we designed a multilayer with {Gamma} = 0.5 (W and SiC layer thicknesses are the same). This way we end up with a mirror that has only the 1st and 3rd harmonic peak as shown in Figure 1. To suppress reflectivity outside the first peak we used our novel approach, an antireflective coating. Modeling predicted substantial reduction in reflectivity, especially for lower energies as shown in Figure 1. The experimental results of the soft x-ray imager mirror as measured at …
Date:
October 19, 2007
Creator:
Bajt, S
Object Type:
Report
System:
The UNT Digital Library
Today Cedar Hill (Duncanville, Tex.), Vol. 35, No. 30, Ed. 1 Thursday, October 19, 2000
Weekly newspaper published in Duncanville, Texas that includes local Cedar Hill, state, and national news along with advertising.
Date:
October 19, 2000
Creator:
Balentine, Kevin
Object Type:
Newspaper
System:
The Portal to Texas History
Gyrokinetic Stability Studies of the Microtearing Mode in the National Spherical Torus Experiment H-mode
Insight into plasma microturbulence and transport is being sought using linear simulations of drift waves on the National Spherical Torus Experiment (NSTX), following a study of drift wave modes on the Alcator C-Mod Tokamak. Microturbulence is likely generated by instabilities of drift waves, which cause transport of heat and particles. Understanding this transport is important because the containment of heat and particles is required for the achievement of practical nuclear fusion. Microtearing modes may cause high heat transport through high electron thermal conductivity. It is hoped that microtearing will be stable along with good electron transport in the proposed low collisionality International Thermonuclear Experimental Reactor (ITER). Stability of the microtearing mode is investigated for conditions at mid-radius in a high density NSTX high performance (H-mode) plasma, which is compared to the proposed ITER plasmas. The microtearing mode is driven by the electron temperature gradient, and believed to be mediated by ion collisions and magnetic shear. Calculations are based on input files produced by TRXPL following TRANSP (a time-dependent transport analysis code) analysis. The variability of unstable mode growth rates is examined as a function of ion and electron collisionalities using the parallel gyrokinetic computational code GS2. Results show the microtearing …
Date:
October 19, 2005
Creator:
Baumgaertel J.A., Redi M.H., Budny R.V., Rewoldt G., Dorland W.
Object Type:
Report
System:
The UNT Digital Library
An overview of DOE's program to recycle/reuse spent refractories as a slag conditioner and to extend refractory service life in the EAF.
None
Date:
October 19, 2000
Creator:
Bennett, J. P.; Kwong, K.-S.; Krabbe, R.; Singh, J. P.; Skaar, E. C.; Wiskochil, D. et al.
Object Type:
Article
System:
The UNT Digital Library
TRANSPARENCY: Tracking Uranium under the U.S. / Russian HEU Purchase Agreement
By the end of August, 2005, the Russia Federation delivered to the United States (U.S.) more than 7,000 metric tons (MT) of low enriched uranium (LEU) containing approximately 46 million SWU and 75,000 MT of natural uranium. This uranium was blended down from weapons-grade (nominally enriched to 90% {sup 235}U) highly enriched uranium (HEU) under the 1993 HEU Purchase Agreement that provides for the blend down of 500 MT HEU into LEU for use as fuel in commercial nuclear reactors. The HEU Transparency Program, under the National Nuclear Security Administration (NNSA), monitored the conversion and blending of the more than 250 MT HEU used to produce this LEU. The HEU represents more than half of the 500 MT HEU scheduled to be blended down through the year 2013 and is equivalent to the elimination of more than 10,000 nuclear devices. The HEU Transparency Program has made considerable progress in its mission to develop and implement transparency measures necessary to assure that Russian HEU extracted from dismantled Russian nuclear weapons is blended down into LEU for delivery to the United States. U.S. monitor observations include the inventory of in process containers, observation of plant operations, nondestructive assay measurements to determine {sup …
Date:
October 19, 2005
Creator:
Benton, J B; Decman, D J & Leich, D A
Object Type:
Article
System:
The UNT Digital Library
Studies of $e^+e^-$ Collisions with a Hard Initial-State Photon at BaBar
The authors present preliminary BaBar measurements of hadronic cross sections in e{sup +}e{sup -} annihilation using the radiative return technique. The cross sections for e{sup +}e{sup -} {yields} p{bar p}, 3({pi}{sup +}{pi}{sup -}), 2({pi}{sup +}{pi}{sup -})2{pi}{sup 0}, and K{sup +}K{sup -}2({pi}{sup +}{pi}{sup -}) are measured. Measurements of the proton form factor and of the ratio G{sub E}/G{sub M} are also shown.
Date:
October 19, 2005
Creator:
Berger, Nicolas
Object Type:
Article
System:
The UNT Digital Library
Searches for Pentaquark Baryons at BaBar
This paper presents the results of inclusive searches for the strange pentaquark states {Theta}{sup +}(1540), {Xi}{sub 5}{sup --}(1860) and {Xi}{sub 5}(1860){sup 0} as well as the anti-charm pentaquark state {Theta}{sub c}(3099){sup 0} in a dataset of 123.4 fb{sup -1} collected on and 40MeV below the {Upsilon}(4S) resonance by the BABAR detector at the e{sup +}e{sup -} PEP-II storage rings. No evidence for the pentaquark states is found and upper limits on the rate of {Theta}{sup +}(1540) and {Xi}{sub 5}{sup --}(1860) production in e{sup +}e{sup -} annihilation are obtained.
Date:
October 19, 2005
Creator:
Berger-Hryn'ova, Tetiana
Object Type:
Article
System:
The UNT Digital Library
Geomechanical/Geochemical Modeling Studies Conducted within theInternational DECOVALEX Project
The DECOVALEX project is an international cooperative project initiated by SKI, the Swedish Nuclear Power Inspectorate, with participation of about 10 international organizations. The general goal of this project is to encourage multidisciplinary interactive and cooperative research on modeling coupled thermo-hydro-mechanical-chemical (THMC) processes in geologic formations in support of the performance assessment for underground storage of radioactive waste. One of the research tasks, initiated in 2004 by the U.S. Department of Energy (DOE), addresses the long-term impact of geomechanical and geochemical processes on the flow conditions near waste emplacement tunnels. Within this task, four international research teams conduct predictive analysis of the coupled processes in two generic repositories, using multiple approaches and different computer codes. Below, we give an overview of the research task and report its current status.
Date:
October 19, 2005
Creator:
Birkholzer, J.T.; Rutqvist, J.; Sonnenthal, E.L.; Barr, D.; Chijimatsu, M.; Kolditz, O. et al.
Object Type:
Article
System:
The UNT Digital Library
Effects of Te inclusions on the performance of CdZnTe radiation detectors
Te inclusions existing at high concentrations in CdZnTe (CZT) material can degrade the performance of CZT detectors. These microscopic defects trap the free electrons generated by incident radiation, so entailing significant fluctuations in the total collected charge and thereby strongly affecting the energy resolution of thick (long-drift) detectors. Such effects were demonstrated in thin planar detectors, and, in many cases, they proved to be the dominant cause of the low performance of thick detectors, wherein the fluctuations in the charge losses accumulate along the charge's drift path. We continued studying this effect using different tools and techniques. We employed a dedicated beamline recently established at BNL's National Synchrotron Light Source for characterizing semiconductor radiation detectors, along with an IR transmission microscope system, the combination of which allowed us to correlate the concentration of defects with the devices performances. We present here our new results from testing over 50 CZT samples grown by different techniques. Our goals are to establish tolerable limits on the size and concentrations of these detrimental Te inclusions in CZT material, and to provide feedback to crystal growers to reduce their numbers in the material.
Date:
October 19, 2008
Creator:
Bolotnikov, A. E.; Abdul-Jabber, N. M.; Babalola, O. S.; Camarda, G. S.; Cui, Y.; Hossain, A. M. et al.
Object Type:
Article
System:
The UNT Digital Library
Internal electric-field-lines distribution in CdZnTe detectors measured using X-ray mapping
The ideal operation of CdZnTe devices entails having a uniformly distributed internal electric field. Such uniformity especially is critical for thick long-drift-length detectors, such as large-volume CPG and 3-D multi-pixel devices. Using a high-spatial resolution X-ray mapping technique, we investigated the distribution of the electric field in real devices. Our measurements demonstrate that in thin detectors, <5 mm, the electric field-lines tend to bend away from the side surfaces (i.e., a focusing effect). In thick detectors, >1 cm, with a large aspect ratio (thickness-to-width ratio), we observed two effects: the electric field lines bending away from or towards the side surfaces, which we called, respectively, the focusing field-line distribution and the defocusing field-line distribution. In addition to these large-scale variations, the field-line distributions were locally perturbed by the presence of extended defects and residual strains existing inside the crystals. We present our data clearly demonstrating the non-uniformity of the internal electric field.
Date:
October 19, 2009
Creator:
Bolotnikov, A. E.; Camarda, G. S.; Cui, Y.; Hossain, A.; Yang, G.; Yao, H. W. et al.
Object Type:
Article
System:
The UNT Digital Library
Grandview Tribune (Grandview, Tex.), Vol. 107, No. 7, Ed. 1 Friday, October 19, 2001
Weekly newspaper from Grandview, Texas that includes local, state, and national news along with advertising.
Date:
October 19, 2001
Creator:
Bosher, Casey
Object Type:
Newspaper
System:
The Portal to Texas History
Community Development Block Grant Funds in Disaster Relief and Recovery
In the aftermath of previous, presidentially-declared disasters, Congress has used the Community Development Block Grant (CDBG) program to help states and local governments finance recovery efforts, whether from natural or man-made disasters. This report will provide a general overview of the CDBG program and its use in disaster relief.
Date:
October 19, 2005
Creator:
Boyd, Eugene
Object Type:
Report
System:
The UNT Digital Library
Novel Metal Hydroxide Derivatives Containing Chemically Bound Organophosphorus or Polyphosphate Species as Flame Retardants
Patent relating to novel metal hydroxide derivatives containing chemically bound organophosphorus or polyphosphate species as flame retardants.
Date:
March 29, 2006
Creator:
Braterman, Paul S.; D'Souza, Nandika & Dharia, Amit
Object Type:
Patent
System:
The UNT Digital Library
The Goldthwaite Eagle (Goldthwaite, Tex.), Vol. 106, No. 13, Ed. 1 Thursday, October 19, 2000
Weekly newspaper from Goldthwaite, Texas that includes local, state, and national news along with extensive advertising.
Date:
October 19, 2000
Creator:
Bridges, G. Frank & Bridges, Georgie
Object Type:
Newspaper
System:
The Portal to Texas History
The Goldthwaite Eagle (Goldthwaite, Tex.), Vol. 109, No. 14, Ed. 1 Wednesday, October 19, 2005
Weekly newspaper from Goldthwaite, Texas that includes local, state, and national news along with extensive advertising.
Date:
October 19, 2005
Creator:
Bridges, G. Frank & Bridges, Georgie
Object Type:
Newspaper
System:
The Portal to Texas History