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Southwest Retort, Volume 58, Number 7, March 2006
This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community. Published monthly during long academic semesters.
Date:
February 2006
Creator:
American Chemical Society. Dallas/Fort Worth Section.
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
Temperature Study of CdZnTe Coplanar-Grid Detectors
The coplanar-grid (CPG) and other electron only detection techniques have made possible the use of CdZnTe-based detectors for gamma-ray spectroscopy when high efficiency, good energy resolution, and near room temperature operation are required. Despite the demonstrated potential of the technologies, widespread use remains hampered in part by the limited availability of the highly uniform CdZnTe material required for high-resolution spectroscopy. However, it has been recently shown that mild cooling of CdZnTe CPG detectors can result in a significant improvement in the energy resolution of the detectors thereby allowing a wider range of material to be used for high-resolution applications. In this paper, we show that improved spectroscopic performance can consistently be achieved through a combination of detector cooling and increased detector bias. Energy resolutions of about 1 % FWHM at 662 keV for detector volumes up to 2.3 cm{sup 3} have been obtained at -20 C. With the electronic noise subtracted, this amounts to an intrinsic resolution of 0.76 %. We also show that further cooling of the detectors to -30 C leads to field polarization and a loss of spectroscopic performance.
Date:
February 14, 2006
Creator:
Amman, Mark; Lee, Julie S. & Luke, Paul N.
Object Type:
Article
System:
The UNT Digital Library
Smoothing of ultrathin silver films by transition metalseeding
The nucleation and coalescence of silver islands on coated glass was investigated by in-situ measurements of the sheet resistance. Sub-monolayer amounts of transition metals (Nb, Ti, Ni, Cr, Zr, Ta, and Mo) were deposited prior to the deposition of silver. It was found that some, but not all, of the transition metals lead to coalescence of silver at nominally thinner films with smoother topology. The smoothing effect of the transition metal at sub-monolayer thickness can be explained by a thermodynamic model of surface energies.
Date:
February 10, 2006
Creator:
Anders, Andre; Byon, Eungsun; Kim, Dong-Ho; Fukuda, Kentaro & Lim,Sunnie H.N.
Object Type:
Article
System:
The UNT Digital Library
MPSA 2004 Final Report
This proposal was to support a portion of the costs of Methods in Protein Structure Analysis 2004 (MPSA2004). MPSA2004 was the 15th in the series of MPSA international conferences on protein structure analysis that began in 1974. MPSA2004 was held on the campus of the University of Washington, Seattle, WA August 29 through September 2, 2004. Twenty-four internationally recognized speakers gave invited presentations; additional participants were chosen to present short talks in the 10 topics that were addressed. The aim of MPSA conferences is to communicate the latest, cutting-edge techniques in protein structure analysis and proteomics through science success stories as told by the scientific leaders who developed the technologies. Biotechnology vendors are present to explain currently available commercial technology through workshops and demonstrations booths. The overall aim is to provide a forum for exchanging the latest methods and ideas in protein structure analysis and proteomics to current and future practitioners. The conference supported the missions of the DOE Office of Science and the Office of Biological and Environmental Research (BER) in at least two ways: by enabling the above forum, and by encouraging young researchers who might otherwise not attend to meet leading researchers and to learn about the …
Date:
February 18, 2006
Creator:
Anderson, Carl W.
Object Type:
Text
System:
The UNT Digital Library
Advanced Gasification By-Product Utilization
With the recent passing of new legislation designed to permanently cap and reduce mercury emissions from coal-fired utilities, it is more important than ever to develop and improve upon methods of controlling mercury emissions. One promising technique is carbon sorbent injection into the flue gas of the coal-fired power plant. Currently, this technology is very expensive as costly commercially activated carbons are used as sorbents. There is also a significant lack of understanding of the interaction between mercury vapor and the carbon sorbent, which adds to the difficulty of predicting the amount of sorbent needed for specific plant configurations. Due to its inherent porosity and adsorption properties as well as on-site availability, carbons derived from gasifiers are potential mercury sorbent candidates. Furthermore, because of the increasing restricted use of landfilling, the coal industry is very interested in finding uses for these materials as an alternative to the current disposal practice. The results of laboratory investigations and supporting technical assessments conducted under DOE Subcontract No. DE-FG26-03NT41795 are reported for the period September 1, 2004 to August 31, 2005. This contract is with the University of Kentucky Research Foundation, which supports work with the University of Kentucky Center for Applied Energy Research …
Date:
February 1, 2006
Creator:
Andrews, Rodney; Rubel, Aurora; Groppo, Jack; Geertsema, Ari; Huggins, Frank; Maroto-Valer, M. Mercedes et al.
Object Type:
Report
System:
The UNT Digital Library
Simulación de la dinámica de un bosque tropical en los Llanos occidentales de Venezuela
Article discussing the simulation of the dynamics of a tropical forest in the Western Llanos of Venezuela.
Date:
February 2006
Creator:
Angulo, Hirma RamÃrez; Ablan, Magdiel; Torres-Lezama, Armando & Acevedo, Miguel F.
Object Type:
Article
System:
The UNT Digital Library
Measurement of Low Energy e+e- Interactions at BABARwith Initial State Radiation
The status of the analysis of e{sup +}e{sup -} annihilation using the radiative return technique at BaBar is presented. Cross sections for the processes e{sup +}e{sup -} {yields} {pi}{sup +}{pi}{sup -}{pi}{sup 0}, {pi}{sup +}{pi}{sup -}{pi}{sup +}{pi}{sup -}, {pi}{sup +}{pi}{sup -}K{sup +}K{sup -}, K{sup +}K{sup -}K{sup +}K{sup -}, 3({pi}{sup +}{pi}{sup -}), {pi}{sup 0}{pi}{sup 0}2({pi}{sup +}{pi}{sup -}), K{sup +}K{sup -}2({pi}{sup +}{pi}{sup -}) and p{bar p} are measured in the energy range from threshold up to 4.5 GeV. Studies on resonant structures involved in these processes have been performed. We present also new precise measurements of the effective proton form factor and of the ratio of the electric to magnetic proton form factor, |G{sub E}/G{sub M}|. In addition, the J/{psi} and {psi}(2S) branching fractions to all these final states have been measured.
Date:
February 22, 2006
Creator:
Anulli, F.
Object Type:
Article
System:
The UNT Digital Library
Individuals with Disabilities Education Act (IDEA): Current Funding Trends
This report provides an overview of the funding trends on the Individuals with Disabilities Education Act (IDEA).
Date:
February 16, 2006
Creator:
Apling, Richard N.
Object Type:
Report
System:
The UNT Digital Library
A Review of Hazardous Chemical Species Associated with CO2 Capture from Coal-Fired Power Plants and Their Potential Fate in CO2 GeologicStorage
Conventional coal-burning power plants are major contributors of excess CO2 to the atmospheric inventory. Because such plants are stationary, they are particularly amenable to CO2 capture and disposal by deep injection into confined geologic formations. However, the energy penalty for CO2 separation and compression is steep, and could lead to a 30-40 percent reduction in useable power output. Integrated gas combined cycle (IGCC) plants are thermodynamically more efficient, i.e.,produce less CO2 for a given power output, and are more suitable for CO2 capture. Therefore, if CO2 capture and deep subsurface disposal were to be considered seriously, the preferred approach would be to build replacement IGCC plants with integrated CO2 capture, rather than retrofit existing conventional plants. Coal contains minor quantities of sulfur and nitrogen compounds, which are of concern, as their release into the atmosphere leads to the formation of urban ozone and acid rain, the destruction of stratospheric ozone, and global warming. Coal also contains many trace elements that are potentially hazardous to human health and the environment. During CO2 separation and capture, these constituents could inadvertently contaminate the separated CO2 and be co-injected. The concentrations and speciation of the co-injected contaminants would differ markedly, depending on whether CO2 …
Date:
February 23, 2006
Creator:
Apps, J. A.
Object Type:
Report
System:
The UNT Digital Library
That You Might Believe - The Gospel of John and Salvation
Lecture given Wednesday, February 22, 2006, 9:45 AM at Abilene Christian University: "In many ways, the themes of John's gospel are unique and compelling. Three theologians read the Gospel of John to see what it has to say about truth, trinity and salvation."
Date:
February 22, 2006
Creator:
Aquino, Frederick; Carter, Kelly & Hamilton, Rex
Object Type:
Sound
System:
The Portal to Texas History
That You Might Believe - The Gospel of John and the Trinity
Lecture given Tuesday, February 21, 2006, 9:45 AM at Abilene Christian University: "In many ways, the themes of John's gospel are unique and compelling. Three theologians read the Gospel of John to see what it has to say about truth, trinity and salvation."
Date:
February 21, 2006
Creator:
Aquino, Frederick; Carter, Kelly & Hamilton, Rex
Object Type:
Sound
System:
The Portal to Texas History
That You Might Believe - Truth in the Gospel of John
Lecture given Monday, February 20, 2006, 9:45 AM at Abilene Christian University: "In many ways, the themes of John's gospel are unique and compelling. Three theologians read the Gospel of John to see what it has to say about truth, trinity and salvation."
Date:
February 20, 2006
Creator:
Aquino, Frederick; Carter, Kelly & Hamilton, Rex
Object Type:
Sound
System:
The Portal to Texas History
Lux Et Tenebrae - Light and Darkness in Sacred Music
Lecture given Monday, February 20, 2006, 2:00 PM at Abilene Christian University: "Music has long held a mysterious ability to sound shadowy or brilliant, but what are the theological implications of this ability as it relates to sacred music? A panel of theology and music faculty from ACU will discuss this issue by using specific examples of works to be performed by the ACU A Cappella Chorus concert later this evening."
Date:
February 20, 2006
Creator:
Aquino, Frederick; Scarbrough, Michael & Straughn, Greg
Object Type:
Sound
System:
The Portal to Texas History
Evolution of Ni3X Precipitation Kinetics, Morphology and Spatial Correlations in Binary Ni-X Alloys Aged Under Externally Applied Stress
Coarsening of Ni3Al, Ni3Ga, Ni3Ge and Ni3Si precipitates in aged binary single-crystal Ni-Al, Ni-Ga, Ni-Ge and Ni-Si alloys under applied compressive stress was measured experimentally over the temperature range 600 to 700 °C. Experiments were also performed on binary Ni-Al single crystals deformed in tension at 640 °C. The orientation of the crystals was [100] in all the experiments. Compared to the kinetics of coarsening in unstressed alloys, coarsening was slightly slower in specimens aged under compression and slightly faster in specimens aged in tension. The effect of applied stress on morphology and spatial correlation was also measured and found to be small. Ni3Al precipitates of a given size generally tended to become more non-equiaxed and their interfaces more planar, with increasing compressive stress. Ni3Ge precipitates behaved differently, becoming more spherical in specimens aged under compression. The effect of applied stress on kinetics is attributed to the influence of elastic deformation on diffusion. A model was developed that predicts slightly slower diffusion under compression and slightly faster diffusion in tension. The elastic constants of single crystals of Ni-Al, Ni-Si, Ni-Ga and Ni-Ge solid solutions were measured from room temperature to about 1100 K using resonant ultrasound spectroscopy.
Date:
February 7, 2006
Creator:
Ardell, Alan J.
Object Type:
Report
System:
The UNT Digital Library
General Thomas Stafford Museum
Photograph of a scene at the General Thomas Stafford Museum.
Date:
February 2006
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
General Thomas Stafford Museum
Photograph of a scene at the General Thomas Stafford Museum.
Date:
February 2006
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
General Thomas Stafford Museum
Photograph of a scene at the General Thomas Stafford Museum.
Date:
February 2006
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
General Thomas Stafford Museum
Photograph of a scene at the General Thomas Stafford Museum.
Date:
February 2006
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
General Thomas Stafford Museum
Photograph of a scene at the General Thomas Stafford Museum.
Date:
February 2006
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
General Thomas Stafford Museum
Photograph of a scene at the General Thomas Stafford Museum.
Date:
February 2006
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
General Thomas Stafford Museum
Photograph of a scene at the General Thomas Stafford Museum.
Date:
February 2006
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
General Thomas Stafford Museum
Photograph of a scene at the General Thomas Stafford Museum.
Date:
February 2006
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
General Thomas Stafford Museum
Photograph of a scene at the General Thomas Stafford Museum.
Date:
February 2006
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
General Thomas Stafford Museum
Photograph of a scene at the General Thomas Stafford Museum.
Date:
February 2006
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History