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451 Matching Results
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Veterans Medical Care: FY2009 Appropriations
None
Date:
October 24, 2008
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
The Challenges and Potential of Nuclear Energy for Addressing Climate Change
The response to climate change and the stabilization of atmospheric greenhouse gas concentrations has major implications for the global energy system. Stabilization of atmospheric carbon dioxide (CO2) concentrations requires a peak and an indefinite decline of global CO2 emissions. Nuclear energy, along with other technologies, has the potential to contribute to the growing demand for energy without emitting CO2. Nuclear energy is of particular interest because of its global prevalence and its current significant contribution, nearly 20%, to the world’s electricity supply. We have investigated the value of nuclear energy in addressing climate change, and have explored the potential challenges for the rapid and large-scale expansion of nuclear energy as a response to climate change. The scope of this study is long-term and the modeling time frame extends out a century because the nature of nuclear energy and climate change dictate that perspective. Our results indicate that the value of the nuclear technology option for addressing climate change is denominated in trillions of dollars. Several-fold increases to the value of the nuclear option can be expected if there is limited availability of competing carbon-free technologies, particularly fossil-fuel based technologies that can capture and sequester carbon. Challenges for the expanded global …
Date:
October 24, 2007
Creator:
Kim, Son H. & Edmonds, James A.
Object Type:
Report
System:
The UNT Digital Library
Attempt to produce element 120 in the 244Pu + 58Fe reaction
An experiment aimed at the synthesis of isotopes of element 120 has been performed using the {sup 244}Pu({sup 58}Fe,xn){sup 302-x} 120 reaction. No decay chains consistent with fusion-evaporation reaction products were observed during an irradiation with a beam dose of 7.1 x 10{sup 18} 330-MeV {sup 58}Fe projectiles. The sensitivity of the experiment corresponds to a cross section of 0.4 pb for the detection of one decay.
Date:
October 24, 2008
Creator:
Oganessian, Y. T.; Utyonkov, V. K.; Lobanov, Y. V.; Abdullin, F. S.; Polyakov, A. N.; Sagaidak, R. N. et al.
Object Type:
Article
System:
The UNT Digital Library
[Letter from Philip A. Berkebile to Guy Kerr, October 24, 2004]
Letter from Philip A. Berkebile, Executive Vice President of TDNA, to Guy Kerr, Senior Vice President / Law and Government Secretary at Belo Corp, on October 24, 2004. The letter is in regards to Guy being selected by the nomination committee to be a candidates to serve a three-year term on the TDNA board of directors.
Date:
October 24, 2004
Creator:
Berkebile, Philip A.
Object Type:
Letter
System:
The UNT Digital Library
[Letter template from the TDNA President to Nelson Clyde IV, October 24, 2006]
Letter from the TDNA President to Nelson Clyde IV on October 24, 2006 congratulating him on being elected TDNA's treasurer beginning January 1, 2007 and on becoming the associations president in 2009. The TDNA will issue a press release on Clyde's election at a later date and when they announce the names of the new members elected to the board of directors.
Date:
October 24, 2006
Creator:
unknown
Object Type:
Letter
System:
The UNT Digital Library
The Albany News (Albany, Tex.), Vol. 127, No. 21, Ed. 1 Thursday, October 24, 2002
Weekly newspaper from Albany, Texas that includes local, county, and state news along with extensive advertising.
Date:
October 24, 2002
Creator:
Lucas, Melinda L.
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 38, No. 449, Ed. 1 Wednesday, October 24, 2007
Free weekly newspaper that includes business and classified advertising.
Date:
October 24, 2007
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 39, No. 455, Ed. 1 Friday, October 24, 2008
Free weekly newspaper that includes business and classified advertising.
Date:
October 24, 2008
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Greensheet (Dallas, Tex.), Vol. 31, No. 197, Ed. 1 Wednesday, October 24, 2007
Free weekly newspaper that includes business and classified advertising.
Date:
October 24, 2007
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Conceptual Design of an Antiproton Generation and Storage Facility
The Antiproton Generation and Storage Facility (AGSF) creates copious quantities of antiprotons, for bottling and transportation to remote cancer therapy centers. The #12;first step in the generation and storage process is to accelerate an intense proton beam down the Main Linac for injection into the Main Ring, which is a Rapid Cycling Synchrotron that accelerates the protons to high energy. The beam is then extracted from the ring into a transfer line and into a Proton Target. Immediately downstream of the target is an Antiproton Collector that captures some of the antiprotons and focuses them into a beam that is transported sequentially into two antiproton rings. The Precooler ring rapidly manipulates antiproton bunches from short and broad (in momentum) to long and thin. It then performs some preliminary beam cooling, in the fraction of a second before the next proton bunch is extracted from the Main Ring. Pre-cooled antiprotons are passed on to the Accumulator ring before the next antiprotons arrive from the target. The Accumulator ring cools the antiprotons, compressing them into a dense state that is convenient for mass storage over many hours. Occasionally the Accumulator ring decelerates a large number of antiprotons, injecting them into a Deceleration …
Date:
October 24, 2006
Creator:
Peggs, Stephen
Object Type:
Report
System:
The UNT Digital Library
Noncommutative Dipole Field Theories And Unitarity
We extend the argument of Gomis and Mehen for violation of unitarity in field theories with space-time noncommutativity to dipole field theories. In dipole field theories with a timelike dipole vector, we present 1-loop amplitudes that violate the optical theorem. A quantum mechanical system with nonlocal potential of finite extent in time also shows violation of unitarity.
Date:
October 24, 2003
Creator:
Chiou, Dah-Wei & Ganor, Ori J.
Object Type:
Article
System:
The UNT Digital Library
MICROSCANNING XRF, XANES, AND XRD STUDIES OF THEDECORATED SURFACE OF ROMAN TERRA SIGILLATA CERAMICS
Different microscanning synchrotron techniques were used to better understand the elaboration process and origins of Terra Sigillata potteries from the Roman period. A mixture Gallic slip sample cross-section showing red and yellow colors was studied. The small (micron) size of the X-ray beam available at Stanford Synchrotron Radiation Laboratory (SSRL) and Advanced Light Source (ALS) synchrotron sources, coupled with the use of a sample scanning stage allowed us to spatially resolve the distribution of the constitutive mineral phases related to the chemical composition. Results show that red color is a result of iron-rich hematite crystals and the yellow part is a result of the presence of Ti-rich rutile-type phase (brookite). Volcanic-type clay is at the origin of these marble Terra Sigillata.
Date:
October 24, 2008
Creator:
Mirguet, C.; Sciau, P.; Goudeau, P.; Mehta, A.; Pianetta, P.; Liu, Z. et al.
Object Type:
Article
System:
The UNT Digital Library
HEU Holdup Measurements in 321-M Freon Cart
None
Date:
October 24, 2000
Creator:
Salaymeh, S.R.
Object Type:
Report
System:
The UNT Digital Library
[Letter from Philip A. Berkebile to Doug Toney, October 24, 2004]
Letter from Philip A. Berkebile, Executive Vice President at TDNA, to Doug Toney, Publisher at Herald-Zeitung, on October 24, 2004. The letter is in regards to Toney being selected by the nomination committee to be a candidate to serve a full three-year term on the TDNA board of directors.
Date:
October 24, 2004
Creator:
Berkebile, Philip A.
Object Type:
Letter
System:
The UNT Digital Library
[Letter from Philip A. Berkebile to Darrell Coleman, October 24, 2004]
Letter from Philip A. Berkebile, Executive Vice President at TDNA, to Darrell Coleman, President and Publisher at the Wichita Falls Times Record News, on October 24, 2004. The letter is in regards to Berkebile congratulating Coleman on being selected by the nomination committee to be a candidate and serve on the TDNA board of directors. cc'd on the letter are Donnis Bagget and Wesley R. Turner.
Date:
October 24, 2004
Creator:
Berkebile, Philip A.
Object Type:
Letter
System:
The UNT Digital Library
Study of Charm Baryons with the BaBar Experiment
The authors report on several studies of charm baryon production and decays by the BABAR collaboration. They confirm previous observations of the {Xi}'{sub c}{sup 0/+}, {Xi}{sub c}(2980){sup +} and {Xi}{sub c}(3077){sup +} baryons, measure branching ratios for Cabibbo-suppressed {Lambda}{sub c}{sup +} decays and use baryon decays to study the properties of the light-quark baryons, {Omega}{sup -} and {Xi}(1690){sup 0}.
Date:
October 24, 2006
Creator:
Petersen, Brian Aa.
Object Type:
Article
System:
The UNT Digital Library
Stringy Instantons and Quiver Gauge Theories
We explore contributions to the 4D effective superpotential which arise from Euclidean D3 branes (''instantons'') that intersect space-filling D-branes. These effects can perturb the effective field theory on the space-filling branes by nontrivial operators composed of charged matter fields, changing the vacuum structure in a qualitative way in some examples. Our considerations are exemplified throughout by a careful study of a fractional brane configuration on a del Pezzo surface.
Date:
October 24, 2006
Creator:
Florea, Bogdan; Kachru, Shamit; McGreevy, John & Saulina, Natalia
Object Type:
Article
System:
The UNT Digital Library
Study of Collective Beam Instabilities using a Correleation-moment Analysis
A general formalism for treating simultaneously the transverse coupled bunch and transverse coupled mode instabilities is presented. In this approach, the equations of motion of a coupled multi-bunch beam are expanded to yield a system of equations involving correlation-moments of the transverse and longitudinal motions. After a proper truncation, the system of equations is closed and can be solved. This approach allows us to formulate within one framework several known instability mechanisms including the single bunch mode coupling instability, the coupled bunch instability, the mode coupling instability, and the coupled mode coupled bunch instability as particular cases.
Date:
October 24, 2006
Creator:
Heifets, S. A. & Chao, A. W.
Object Type:
Article
System:
The UNT Digital Library
Recent Improvements to an Advanced Atmospheric Transport Modeling System
The Atmospheric Technologies Group (ATG) has developed an advanced atmospheric modeling capability using the Regional Atmospheric Modeling System (RAMS) and a stochastic Lagrangian particle dispersion model (LPDM) for operational use at the Savannah River Site (SRS). For local simulations concerning releases from the Central Savannah River Area (CSRA), RAMS is run in a nested grid configuration with horizontal grid spacing of 8 and 2 km for each grid, with 6-hr forecasts updated every 3 hours. An interface to allow for easy user access to LPDM had been generated, complete with post-processing results depicting surface concentration, deposition, and a variety of dose quantities. A prior weakness in this approach was that observations from the SRS tower network were only incorporated into the three-dimensional modeling effort during the initialization process. Thus, if the forecasted wind fields were in error, the resulting plume predictions would also be erroneous. To overcome this shortcoming, the procedure for generating RAMS wind fields and reading them into LPDM has been modified such that SRS wind measurements are blended with the predicted three-dimensional wind fields from RAMS using the Barnes technique. In particular, the horizontal components in RAMS are replaced with the observed values at a series of …
Date:
October 24, 2005
Creator:
Buckley, R. L. & Hunter, C. H.
Object Type:
Article
System:
The UNT Digital Library
Savannah River National Laboratory Involvement in the European ENSEMBLE Program
Many atmospheric transport and dispersion models now exist to provide consequence assessment during emergency response to near-field releases. One way of estimating the uncertainty for a given forecast is to statistically analyze an ensemble of results from several models. ENSEMBLE is a European Union program that utilizes an internet-based system to ingest transport results from numerous modeling agencies. This paper addresses the involvement of the Savannah River National Laboratory (SRNL) in ENSEMBLE, and the resulting improvements in SRNL modeling capabilities. SRNL, the only United States agency involved in the ENSEMBLE program, uses a prognostic atmospheric numerical model (the Regional Atmospheric Modeling System, RAMS) to provide three-dimensional and time-varying meteorology as input to a stochastic Lagrangian particle mode . The model design used by SRNL is discussed, including recent upgrades to the system using parallel processing which allows for finer grid resolution in the generation of the meteorology.
Date:
October 24, 2005
Creator:
Buckley, R. L. & Addies, Robert P.
Object Type:
Article
System:
The UNT Digital Library
Most of rare missense alleles in humans are deleterious:implications for evolution of complex disease and associationstudies
The accumulation of mildly deleterious missense mutations inindividual human genomes has been proposed to be a genetic basis forcomplex diseases. The plausibility of this hypothesis depends onquantitative estimates of the prevalence of mildly deleterious de novomutations and polymorphic variants in humans and on the intensity ofselective pressure against them. We combined analysis of mutationscausing human Mendelian diseases, human-chimpanzee divergence andsystematic data on human SNPs and found that about 20 percent of newmissense mutations in humans result in a loss of function, while about 27percent are effectively neutral. Thus, more than half of new missensemutations have mildly deleterious effects. These mutations give rise tomany low frequency deleterious allelic variants in the human populationas evident from a new dataset of 37 genes sequenced in over 1,500individual human chromosomes. Surprisingly, up to 70 percent of lowfrequency missense alleles are mildly deleterious and associated with aheterozygous fitness loss in the range 0.001-0.003. Thus, the low allelefrequency of an amino acid variant can by itself serve as a predictor ofits functional significance. Several recent studies have reported asignificant excess of rare missense variants in disease populationscompared to controls in candidate genes or pathways. These studies wouldbe unlikely to work if most rare variants were neutral …
Date:
October 24, 2006
Creator:
Kryukov, Gregory V.; Pennacchio, Len A. & Sunyaev, Shamil R.
Object Type:
Article
System:
The UNT Digital Library
Crystal structure of kappa-In2Se3
Structural properties of single-phase films of {kappa}-In{sub 2}Se{sub 3} and {gamma}-In{sub 2}Se{sub 3} were investigated. Both films were polycrystalline but their microstructure differed considerably. The a-lattice parameter of {kappa}-In{sub 2}Se{sub 3} has been measured. Comparison between these two materials indicates that {kappa}-In{sub 2}Se{sub 3} has a significantly larger unit cell ({Delta}c = 2.5 {+-} 0.2 % and {Delta}a = 13.5 {+-} 0.5%) and a structure more similar to the {alpha}-phase of In{sub 2}Se{sub 3}.
Date:
October 24, 2002
Creator:
Jasinski, J.; Swider, W.; Washburn, J.; Liliental-Weber, Z.; Chaiken, A.; Nauka, K. et al.
Object Type:
Article
System:
The UNT Digital Library
Digitally Available Interval-Specific Rock-Sample Data Compiled from Historical Records, Nevada Test Site and Vicinity, Nye County, Nevada.
Between 1951 and 1992, 828 underground tests were conducted on the Nevada Test Site, Nye County, Nevada. Prior to and following these nuclear tests, holes were drilled and mined to collect rock samples. These samples are organized and stored by depth of borehole or drift at the U.S. Geological Survey Core Library and Data Center at Mercury, Nevada, on the Nevada Test Site. From these rock samples, rock properties were analyzed and interpreted and compiled into project files and in published reports that are maintained at the Core Library and at the U.S. Geological Survey office in Henderson, Nevada. These rock-sample data include lithologic descriptions, physical and mechanical properties, and fracture characteristics. Hydraulic properties also were compiled from holes completed in the water table. Rock samples are irreplaceable because pre-test, in-place conditions cannot be recreated and samples cannot be recollected from the many holes destroyed by testing. Documenting these data in a published report will ensure availability for future investigators.
Date:
October 24, 2007
Creator:
Wood, David B.
Object Type:
Report
System:
The UNT Digital Library
GLAST LAT And Pulsars: What Do We Learn from Simulations?
Gamma-ray pulsars are among the best targets for the Large Area Telescope (LAT) aboard the GLAST mission. The higher sensitivity, time and energy resolution of the LAT will provide data of fundamental importance to understand the physics of these fascinating objects. Powerful tools for studying the LAT capabilities for pulsar science are the simulation programs developed within the GLAST Collaboration. Thanks to these simulations it is possible to produce a detailed distribution of gamma-ray photons in energy and phase that can be folded through the LAT Instrument Response Functions (IRFs). Here we present some of the main interesting results from the simulations developed to study the discovery potential of the LAT. In particular we will focus on the capability of the LAT to discover new radio-loud gamma-ray pulsars, on the discrimination between Polar Cap and Outer Gap models, and on the LAT pulsar sensitivity.
Date:
October 24, 2007
Creator:
Razzano, Massimiliano; /Pisa U. /INFN, Pisa; Harding, Alice K. & /NASA, Goddard
Object Type:
Article
System:
The UNT Digital Library