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Radiation damage to BSCCO-2223 from 50 MEV protons.

Description: The use of HTS materials in high radiation environmentsrequires that the superconducting properties remain constant up to aradiation high dose. BSCCO-2223 samples from two manufacturers wereirradiated with 50 MeV protons at fluences of up to 5 x 1017 protons/cm2.The samples lost approximately 75 percent of their pre-irradiation Ic.This compares with Nb3Sn, which loses about 50 percent at the samedisplacements per atom.
Date: November 27, 2007
Creator: Zeller, A. F.; Ronningen, R. M.; Godeke, A.; Heilbronn, L. H.; McMahan-Norris, P. & Gupta, R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Characterization of Nuclear Fuel using Multivariate Statistical Analysis

Description: Various combinations of reactor type and fuel composition have been characterized using principle components analysis (PCA) of the concentrations of 9 U and Pu isotopes in the 10 fuel as a function of burnup. The use of PCA allows the reduction of the 9-dimensional data (isotopic concentrations) into a 3-dimensional approximation, giving a visual representation of the changes in nuclear fuel composition with burnup. Real-world variation in the concentrations of {sup 234}U and {sup 236}U in the … more
Date: November 27, 2007
Creator: Robel, M; Robel, M; Robel, M; Kristo, M J & Kristo, M J
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

CRISPR - a Widespread System That Provides Acquired Resistance Against Phages in Bacteria and Archaea

Description: Arrays of clustered, regularly spaced short palindromic repeats (CRISPR) are widespread in the genomes of many bacteria and almost all archaea. These arrays are composed of direct repeats sized 24-47 bp separated by similarly sized non-repetitive sequences (spacers). It was recently experimentally shown that CRISPR arrays, along with a group of associated proteins, confer resistance to phage. Following exposure to phage, bacteria integrate new spacer sequences that are derived from the phage ge… more
Date: November 27, 2007
Creator: Kunin, Victor; Sorek, Rotem; Kunin, Victor & Hugenholtz, Philip
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Cross sections for short pulse single and double ionization ofhelium

Description: In a previous publication, procedures were proposed for unambiguously extracting amplitudes for single and double ionization from a time-dependent wavepacket by effectively propagating for an infinite time following a radiation pulse. Here we demonstrate the accuracy and utility of those methods for describing two-photon single and one-photon double ionization of helium. In particular it is shown how narrow features corresponding to autoionizing states are easily resolved with these methods.
Date: November 27, 2007
Creator: Palacios, Alicia; Rescigno, Thomas N. & McCurdy, C. William
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

DEVELOPMENT OF REMOTE HANFORD CONNECTOR GASKET REPLACEMENT TOOLING FOR THE SAVANNAH RIVER SITE'S DEFENSE WASTE PROCESSING FACILITY

Description: The Savannah River Site's (SRS) Defense Waste Processing Facility (DWPF) requested development of tooling for remote replacement of gaskets in mechanical Hanford connectors. The facility has compressed air supply, two master-slave manipulators (MSM's) and a lightweight robotic arm for operation of the remote tools. The Savannah River National Laboratory (SRNL) developed and tested multiple tools to perform the gasket replacement tasks. Separate pneumatic snap-ring removal tools that use the con… more
Date: November 27, 2007
Creator: Krementz, D
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Startech Hydrogen Production Final Technical Report

Description: The assigned work scope includes the modification and utilization of the Plasma Converter System, Integration of a StarCell{trademark} Multistage Ceramic Membrane System (StarCell), and testing of the integrated systems towards DOE targets for gasification and membrane separation. Testing and evaluation was performed at the Startech Engineering and Demonstration Test Center in Bristol, CT. The Objectives of the program are as follows: (1) Characterize the performance of the integrated Plasma Co… more
Date: November 27, 2007
Creator: Department, Startech Engineering
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Value of End-Use Energy Efficiency in Mitigation of U.S. Carbon Emissions

Description: This report documents a scenario analysis exploring the value of advanced technologies in the U.S. buildings, industrial, and transportation sectors in stabilizing atmospheric greenhouse gas concentrations. The analysis was conducted by staff members of Pacific Northwest National Laboratory (PNNL), working at the Joint Global Change Research Institute (JGCRI) in support of the strategic planning process of the U.S. Department of Energy (U.S. DOE) Office of Energy Efficiency and Renewable Energy… more
Date: November 27, 2007
Creator: Kyle, G. Page; Smith, Steven J.; Clarke, Leon E.; Kim, Son H. & Wise, Marshall A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Near-Edge X-ray Absorption Fine Structure Spectroscopy of Diamondoid Thiol Monolayers on Gold

Description: Diamondoids, hydrocarbon molecules with cubic-diamond-cage structures, have unique properties with potential value for nanotechnology. The availability and ability to selectively functionalize this special class of nanodiamond materials opens new possibilities for surface-modification, for high-efficiency field emitters in molecular electronics, as seed crystals for diamond growth, or as robust mechanical coatings. The properties of self-assembled monolayers (SAMs) of diamondoids are thus of fu… more
Date: November 27, 2007
Creator: Willey, T. M.; Fabbri, J.; Lee, J. I.; Schreiner, P.; Fokin, A. A.; Tkachenko, B. A. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Confocal (micro)-XRF for 3D anlaysis of elements distribution in hot environmental particles

Description: Studies on the fate and transport of radioactive contaminates in the environment are often constrained by a lack of knowledge on the elemental distribution and general behavior of particulate bound radionuclides contained in hot particles. A number of hot particles were previously isolated from soil samples collected at former U.S. nuclear test sites in the Marshall Islands and characterized using non-destructive techniques [1]. The present investigation at HASYLAB is a part of larger research … more
Date: November 27, 2007
Creator: Bielewski, M; Eriksson, M; Himbert, J; Simon, R; Betti, M & Hamilton, T F
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Optimization of Cylindrical Hall Thrusters

Description: The cylindrical Hall thruster features high ionization efficiency, quiet operation, and ion acceleration in a large volume-to-surface ratio channel with performance comparable with the state-of-the-art annular Hall thrusters. These characteristics were demonstrated in low and medium power ranges. Optimization of miniaturized cylindrical thrusters led to performance improvements in the 50-200W input power range, including plume narrowing, increased thruster efficiency, reliable discharge initiat… more
Date: November 27, 2007
Creator: Yevgeny Raitses, Artem Smirnov, Erik Granstedt, and Nathaniel J. Fisch
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Combined Experimental and Computational Studies on the Nature of Aromatic C-H Activation by Octahedral Ruthenium(II) Complexes: Evidence for σ-Bond Metathesis from Hammett Studies

Description: Article discussing combined experimental and computational studies on the nature of aromatic C-H activation by octahedral ruthenium(II) complexes of the type TpRu(L)(NCMe)R [Tp = hydridotris(pyrazolyl)borate; R = alkyl or aryl; L = CO or PMe3].
Date: November 27, 2007
Creator: DeYonker, Nathan J.; Foley, Nicholas A.; Cundari, Thomas R., 1964-; Gunnoe, T. Brent & Petersen, Jeffrey L.
Item Type: Refine your search to only Article
Partner: UNT College of Arts and Sciences

Oral History Interview with Anna Robinson, November 27, 2007

Description: Interview with Anna Robinson, a Women's Army Corps veteran from Fort Worth, Texas. Robinson discusses her family and childhood, joining the WAC, transfer to Germany as a supply clerk in 1946, life and work in that assignment, being in a car wreck, her sexuality and gays in the service, the Iraq War and George W. Bush, leaving the Army and work for the city of Forth Worth as an artist, her church involvement, and returning to Germany,
Access: Restricted to UNT Community Members. Login required if off-campus.
Date: November 27, 2007
Creator: Quick, Janice L. & Robinson, Anna
Item Type: Refine your search to only Book
Partner: UNT Oral History Program
open access

Characteristics of Fault Zones in Volcanic Rocks Near Yucca Flat, Nevada Test Site, Nevada

Description: During 2005 and 2006, the USGS conducted geological studies of fault zones at surface outcrops at the Nevada Test Site. The objectives of these studies were to characterize fault geometry, identify the presence of fault splays, and understand the width and internal architecture of fault zones. Geologic investigations were conducted at surface exposures in upland areas adjacent to Yucca Flat, a basin in the northeastern part of the Nevada Test Site; these data serve as control points for the int… more
Date: November 27, 2007
Creator: Sweetkind, Donald & Drake, Ronald M., II
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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