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Timpson & Tenaha News (Timpson, Tex.), Vol. 21, No. 28, Ed. 1 Thursday, July 13, 2006
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
July 13, 2006
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Timpson & Tenaha News (Timpson, Tex.), Vol. 22, No. 15, Ed. 1 Thursday, April 13, 2006
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
April 13, 2006
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
The Evolution of Two-Component Systems in Bacteria RevealsDifferent Strategies for Niche Adaptation
Two-component systems including histidine protein kinasesrepresent the primary signal transduction paradigm in prokaryoticorganisms. To understand how these systems adapt to allow organisms todetect niche-specific signals, we analyzed the phylogenetic distributionof nearly 5000 histidine protein kinases from 207 sequenced prokaryoticgenomes. We found that many genomes carry a large repertoire of recentlyevolved signaling genes, which may reflect selective pressure to adapt tonew environmental conditions. Both lineage-specific gene family expansionand horizontal gene transfer play major roles in the introduction of newhistidine kinases into genomes; however, there are differences in howthese two evolutionary forces act. Genes imported via horizontal transferare more likely to retain their original functionality as inferred from asimilar complement of signaling domains, while gene family expansionaccompanied by domain shuffling appears to be a major source of novelgenetic diversity. Family expansion is the dominantsource of newhistidine kinase genes in the genomes most enriched in signalingproteins, and detailed analysis reveals that divergence in domainstructure and changes in expression patterns are hallmarks of recentexpansions. Finally, while these two modes of gene acquisition arewidespread across bacterial taxa, there are clear species-specificpreferences for which mode is used.
Date:
September 13, 2006
Creator:
Alm, Eric; Huang, Katherine & Arkin, Adam
Object Type:
Article
System:
The UNT Digital Library
Germanium-Based Detectors for Gamma-Ray Imaging andSpectroscopy
Germanium-based detectors are the standard technology usedfor gamma-ray spectroscopy when high efficiency and excellent energyresolution are desired. By dividing the electrical contacts on thesedetectors into segments, the locations of the gamma-ray interactionevents within the detectors can be determined as well as the depositedenergies. This enables simultaneous gamma-ray imaging and spectroscopyand leads to applications in the areas of astronomy, nuclear physics,environmental remediation, nuclear nonproliferation, and homelandsecurity. Producing the fine-pitched electrode segmentation oftenrequired for imaging has been problematic in the past. To address thisissue, we have developed an amorphous-semiconductor contact technology.Using this technology, fully passivated detectors with closely spacedcontacts can be produced using a simple fabrication process. The currentstate of the amorphous-semiconductor contact technology and thechallenges that remain will be given in this paper.
Date:
October 13, 2006
Creator:
Amman, Mark; Luke, Paul N. & Boggs, Steven E.
Object Type:
Article
System:
The UNT Digital Library
Oil Shale: History, Incentives, and Policy
None
Date:
April 13, 2006
Creator:
Andrews, Anthony
Object Type:
Report
System:
The UNT Digital Library
Radioactive Tank Waste from the Past Production of Nuclear Weapons: Background and Issues for Congress
How to safely dispose of wastes from producing nuclear weapons has been an ongoing issue. The most radioactive portion of these wastes is stored in underground tanks at Department of Energy (DOE) sites in Idaho, South Carolina, and Washington State. There have been concerns about soil and groundwater contamination from some of the tanks that have leaked. This report provides background information on the disposal of radioactive tank waste, analyzes waste disposal authority in P.L. 108-375, and examines potential implications for environmental cleanup.
Date:
June 13, 2006
Creator:
Andrews, Anthony & Bearden, David M.
Object Type:
Report
System:
The UNT Digital Library
Harnessing Innovation for a Renewable Energy Future
None
Date:
September 13, 2006
Creator:
Arvizu, D.
Object Type:
Presentation
System:
The UNT Digital Library
Low Precious Metal Alloy Catalysts and Durable carbon Support
None
Date:
November 13, 2006
Creator:
Atanassova, Paolina; Sun, Yipeng; Rice, Gordon; Brewster, James; Xie, Jian; Kyrlidis, Angelos et al.
Object Type:
Presentation
System:
The UNT Digital Library
Final Report for OJI grant.
This document is a final report for DOE grant DE-FG02-00ER41147. The research described herein was funded in large part by this grant with additional support from the National Science Foundation. The primary focus of Averett's research effort is centered around the polarized {sup 3}He target in Hall A at Jefferson Lab. The close proximity of the College of William and Mary to Jefferson Lab has provided an outstanding opportunity to maintain a very active research program which still satisfying the demands of the college. Our research group includes four faculty, two post-doctoral fellows and eight graduate students. Averett also maintains a fully functional polarized {sup 3}e target lab at William and Mary which allows him to support the research program at Jefferson Lab while also doing research on polarized targets themselves. Since 1998, seven experiments using polarized {sup 3}He have been completed by the Jefferson Lab Hall A Polarized {sup 3}He Collaboration. Ten publications have been produced on this research and analysis of the two most recently completed experiments is underway. A description of the recent experiments and results is given below. In addition to target expertise, Averett has remained one of the most active collaborators in the data analysis …
Date:
October 13, 2006
Creator:
Averett, Todd
Object Type:
Report
System:
The UNT Digital Library
Effects of covalency on the p-shell photoemission of transition metals: MnO
This article discusses the effects of covalency on the p-shell photoemission of transition metals. The treatment of covalency has not been included previously in ab initio theoretical studies of the 2p-shell XPS of transition-metal complexes. In this work, covalent interactions between the metal and ligands are treated on an equal footing with spin-orbit splittings.
Date:
April 13, 2006
Creator:
Bagus, Paul S. & Ilton, Eugene S.
Object Type:
Article
System:
The UNT Digital Library
[E-Mail from Michael Bailey to Mavis May, Mike McKay, etc., October 13, 2006]
E-Mail from Michael Bailey to Mavis May, Mike McKay, etc., October 13, 2006. The email pertains to a previous meeting and Michael Bailey is attaching comments for review.
Date:
October 13, 2006
Creator:
Bailey, Michael
Object Type:
Letter
System:
The UNT Digital Library
Diffusion through Carbon Nanotube Semipermeable membranes
The goal of this project is to measure transport through CNTs and study effects of confinement at molecular scale. This work is motivated by several simulation papers in high profile journals that predict significantly higher transport rates of gases and liquids through carbon nanotubes as compared with similarly-sized nanomaterials (e.g. zeolites). The predictions are based on the effects of confinement, atomically smooth pore walls and high pore density. Our work will provide the first measurements that would compare to and hopefully validate the simulations. Gas flux is predicted to be >1000X greater for SWNTs versus zeolitesi. A high flux of 6-30 H2O/NT/ns {approx} 8-40 L/min for a 1cm{sup 2} membrane is also predicted. Neutron diffraction measurements indicate existence of a 1D water chain within a cylindrical ice sheet inside carbon nanotubes, which is consistent with the predictions of the simulation. The enabling experimental platform that we are developing is a semipermeable membrane made out of vertically aligned carbon nanotubes with gaps between nanotubes filled so that the transport occurs through the nanotubes. The major challenges of this project included: (1) Growth of CNTs in the suitable vertically aligned configuration, especially the single wall carbon nanotubes; (2) Development of a process …
Date:
February 13, 2006
Creator:
Bakajin, O
Object Type:
Report
System:
The UNT Digital Library
Practical superconductor development for electrical power applications annual report for FY 2005.
None
Date:
April 13, 2006
Creator:
Balachandran, U.; Cheon, C.; Claus, H.; Dorris, S. E.; Hiller, J.M.; Gray, K. E. et al.
Object Type:
Report
System:
The UNT Digital Library
Performance and Aging Studies of BaBar Resistive Plate Chambers
The BaBar detector is currently operating nearly 200 Resistive Plate Chambers (RPCs), constructed as part of an upgrade of the forward endcap muon detector in 2002. Although the average RPC efficiency remains high, numerous changes in the RPC performance (increased currents and rates) have been observed. A few of the highest rate RPCs have suffered efficiency losses of more than 15%. Several types of efficiency loss have been observed. Tests with humidified gas have shown that some of the lost efficiency is recoverable. However, efficiency losses in the highest rate regions have not yet improved with humid gases.
Date:
October 13, 2006
Creator:
Band, H. R.; Hollar, J.; Tan, P.; Anulli, F.; Baldini, R.; Calcaterra, A. et al.
Object Type:
Article
System:
The UNT Digital Library
A High-Resolution Godunov Method for Compressible Multi-Material Flow on Overlapping Grids
A numerical method is described for inviscid, compressible, multi-material flow in two space dimensions. The flow is governed by the multi-material Euler equations with a general mixture equation of state. Composite overlapping grids are used to handle complex flow geometry and block-structured adaptive mesh refinement (AMR) is used to locally increase grid resolution near shocks and material interfaces. The discretization of the governing equations is based on a high-resolution Godunov method, but includes an energy correction designed to suppress numerical errors that develop near a material interface for standard, conservative shock-capturing schemes. The energy correction is constructed based on a uniform pressure-velocity flow and is significant only near the captured interface. A variety of two-material flows are presented to verify the accuracy of the numerical approach and to illustrate its use. These flows assume an equation of state for the mixture based on Jones-Wilkins-Lee (JWL) forms for the components. This equation of state includes a mixture of ideal gases as a special case. Flow problems considered include unsteady one-dimensional shock-interface collision, steady interaction of an planar interface and an oblique shock, planar shock interaction with a collection of gas-filled cylindrical inhomogeneities, and the impulsive motion of the two-component mixture in …
Date:
February 13, 2006
Creator:
Banks, J W; Schwendeman, D W; Kapila, A K & Henshaw, W D
Object Type:
Article
System:
The UNT Digital Library
Disproportionation of Gold(II) Complexes. A Density Functional Study of Ligand and Solvent Effects
This article discusses disproportionation of gold(II) as an atomic ion as well as with chloride and neutral ligands.
Date:
July 13, 2006
Creator:
Barakat, Khaldoon A.; Cundari, Thomas R., 1964-; Rabaâ, Hassan & Omary, Mohammad A.
Object Type:
Article
System:
The UNT Digital Library
Theory and Simulation of Warm Dense Matter Targets
We present simulations and analysis of the heating of warm dense matter foils by ion beams with ion energy less than one MeV per nucleon to target temperatures of order one eV. Simulations were carried out using the multi-physics radiation hydrodynamics code HYDRA and comparisons are made with analysis and the code DPC. We simulate possible targets for a proposed experiment at LBNL (the so-called Neutralized Drift Compression Experiment, NDCXII) for studies of warm dense matter. We compare the dynamics of ideally heated targets, under several assumed equation of states, exploring dynamics in the two-phase (fluid-vapor) regime.
Date:
July 13, 2006
Creator:
Barnard, J. J.; Armijo, J.; More, R. M.; Friedman, A.; Kaganovich, I.; Logan, B. G. et al.
Object Type:
Article
System:
The UNT Digital Library
The Carolina Bay Restoration Project - Status Report II 2000-2004.
A Wetlands Mitigation Bank was established at SRS in 1997 as a compensatory alternative for unavoidable wetland losses. Prior to restoration activities, 16 sites included in the project were surveyed for the SRS Site Use system to serve as a protective covenant. Pre-restoration monitoring ended in Fall 2000, and post restoration monitoring began in the Winter/Spring of 2001. The total interior harvest in the 16 bays after harvesting the trees was 19.6 ha. The margins in the opencanopy, pine savanna margin treatments were thinned. Margins containing areas with immature forested stands (bay 5184 and portions of bay 5011) were thinned using a mechanical shredder in November 2001. Over 126 hectares were included in the study areas (interior + margin). Planting of two tree species and the transplanting of wetland grass species was successful. From field surveys, it was estimated that approximately 2700 Nyssa sylvatica and 1900 Taxodium distichum seedlings were planted in the eight forested bays resulting in an average planting density of ≈ 490 stems ha-1. One hundred seedlings of each species per bay (where available) were marked to evaluate survivability and growth. Wetland grass species were transplanted from donor sites on SRS to plots that ranged in size …
Date:
July 13, 2006
Creator:
Barton, Christopher
Object Type:
Report
System:
The UNT Digital Library
FY05 LDRD Final Report Technology Basis for Fluorescence Imaging in the Nuclear Domain (FIND)
Work performed as a part of this ER sets the foundation for applications of high brightness light sources to important homeland security and nonproliferation problems. Extensive modeling has been performed with the aim to understand the performance of a class of interrogation systems that exploit nuclear resonance fluorescence to detect specific isotopes, of particular importance for national security and industry.
Date:
February 13, 2006
Creator:
Barty, C J
Object Type:
Report
System:
The UNT Digital Library
Transport in a highly asymmetric binary fluid mixture
We present molecular dynamics calculations of the thermal conductivity and viscosities of a model colloidal suspension with colloidal particles roughly one order of magnitude larger than the suspending liquid molecules. The results are compared with estimates based on the Enskog transport theory and effective medium theories for thermal and viscous transport. We also discuss the consequences of these results to some proposed mechanisms for thermal conduction in nanocolloidal suspensions.
Date:
October 13, 2006
Creator:
Bastea, S
Object Type:
Article
System:
The UNT Digital Library
Search for CP Violating Neutral Higgs Bosons in the MSSM at LEP
The LEP collaborations ALEPH, DELPHI, L3 and OPAL have searched for the neutral Higgs bosons which are predicted within the framework of the Minimal Supersymmetric Standard Model (MSSM). The data of the four collaborations are statistically combined and show no significant excess of events which would indicate the production of Higgs bosons. The search results are thus used to set upper bounds on the cross sections of various Higgs-like event topologies and limits on MSSM benchmark models, including CP-conserving and CP-violating scenarios. Here, the limits on the model parameters of the CP-violating benchmark scenario CPX and derivates of this scenario are shown.
Date:
March 13, 2006
Creator:
Bechtle, Philip
Object Type:
Article
System:
The UNT Digital Library
The Grandview Tribune (Grandview, Tex.), Vol. 111, No. 7, Ed. 1 Friday, October 13, 2006
Weekly newspaper from Grandview, Texas that includes local, state, and national news along with advertising.
Date:
October 13, 2006
Creator:
Beck-Adams, Candie
Object Type:
Newspaper
System:
The Portal to Texas History
The Grandview Tribune (Grandview, Tex.), Vol. 111, No. 19, Ed. 1 Friday, January 13, 2006
Weekly newspaper from Grandview, Texas that includes local, state, and national news along with advertising.
Date:
January 13, 2006
Creator:
Beck-Adams, Candie
Object Type:
Newspaper
System:
The Portal to Texas History
Animal Identification and Meat Traceability
This report focuses on animal ID and, to a lesser extent, on meat traceability. However, traceability, and the somewhat different but related concepts of "identity prevention" and "product segregation," also pertain to other agricultural products and issues.
Date:
July 13, 2006
Creator:
Becker, Geoffrey S.
Object Type:
Report
System:
The UNT Digital Library