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569 Matching Results
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Hydrogen Permeability of Mulitphase V-Ti-Ni Metallic Membranes
None
Date:
February 14, 2006
Creator:
ADAMS, THAD
Object Type:
Article
System:
The UNT Digital Library
The Eastern Statesman (Wilburton, Okla.), Vol. 81, No. 10, Ed. 1 Friday, February 14, 2003
Biweekly student newspaper from Eastern Oklahoma State College in Wilburton, Oklahoma that includes local, state, and campus news along with advertising.
Date:
February 14, 2003
Creator:
Agent, Alicia
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
European Union–U.S. Trade and Investment Relations: Key Issues
None
Date:
February 14, 2008
Creator:
Aheam, Raymond J.; Fischer, John W.; Goldfarb, Charles B.; Hanrahan, Charles E.; Eubanks, Walter W. & Rubin, Janice E.
Object Type:
Report
System:
The UNT Digital Library
Oxygen Isotopes in Chondritic Interplanetary Dust: Parent-Bodies and Nebular Oxygen Reservoirs
Planetary objects have preserved various amounts of oxygen issued from isotopically different oxygen reservoirs reflecting their origin and physico-chemical history. An {sup 16}O-rich component is preserved in refractory inclusions (CAIs) whereas meteorites matrices are enriched in an {sup 16}O-poor component. The origin of these components is still unclear. The most recent models are based on isotope selective photodissociation of CO in a {sup 16}O-rich nebula/presolr cloud resulting in a {sup 16}O-poor gas in the outer part of the nebula. However because most meteorite components are thought to be formed in the inner 3AU of the solar nebula, the precise isotopic composition of outer solar system components is yet unknown. In that respect, the oxygen isotopic composition of cometary dust is a key to understand the origin of the solar system. The Stardust mission will bring back to the Earth dust samples from comet Wild2, a short period comet from the Jupiter family. A precise determination of the oxygen isotope composition of Wild2 dust grains is essential to decipher the oxygen reservoirs of the outer solar system. However, Stardust samples may be extremely fragmented upon impact in the collector. In addition, interplanetary dust particles (IDPs) collected in the stratosphere are likely …
Date:
February 14, 2006
Creator:
Aleon, J.; McKeegan, K. D. & Leshin, L.
Object Type:
Article
System:
The UNT Digital Library
Timpson & Tenaha News (Timpson, Tex.), Vol. 26, No. 7, Ed. 1 Thursday, February 14, 2008
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
February 14, 2008
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Oral History Interview with Harold Salfen, February 14, 2000
Access:
Use of this item is restricted to the UNT Community
Interview with Harold Salfen, a Army Air Force WWII veteran from O'Fallon, Missouri. Salfen discusses his hometown and family background, his childhood and education, working in St. Louis, attending the University of Missouri, joining the Army Air Force and training, operating a ground radar in the European Theater, liberating Buchenwald Concentration Camp, the end of the war, and returning home. In appendix is a biography/resumé of Salfen's.
Date:
February 14, 2000
Creator:
Alexander, William J. & Salfen, Harold
Object Type:
Book
System:
The UNT Digital Library
Studies of vibrational properties in Ga stabilized delta-Pu by extended X-ray absorption fine structure
Temperature dependent extended x-ray absorption fine structure (EXAFS) spectra were measured for a 3.3 at. % Ga stabilized Pu alloy over the range T= 20 - 300 K. EXAFS data were acquired at both the Ga K-edge and the Pu L{sub III} edge. Curve-fits were performed to the first shell interactions to obtain pair-distance distribution widths, {sigma}, as a function of temperature. The temperature dependence of {sigma}(T) was accurately modeled using a correlated-Debye model for the lattice vibrational properties, suggesting Debye-like behavior in this material. Using this formalism, we obtain pair-specific correlated-Debye temperatures, {Theta}{sub cD}, of 110.7 {+-} 1.7 K and 202.6 {+-} 3.7 K, for the Pu-Pu and Ga-Pu pairs, respectively. The result for the Pu-{Theta}{sub cD} value compares well with previous vibrational studies on {delta}-Pu. In addition, our results represent the first unambiguous determination of Ga-specific vibrational properties in Pu-Ga alloys, i.e, {Theta}{sub cD} for the Ga-Pu pair. Because the Debye temperature can be related to a measure of the lattice stiffness, these results indicate the Ga-Pu bonds are significantly stronger than the Pu-Pu bonds. This effect has important implications for lattice stabilization mechanisms in these alloys.
Date:
February 14, 2002
Creator:
Allen, P. G.; Henderson, A. L.; Sylwester, E. R.; Turchi, P. E. A.; Shen, T. H.; Gallegos, G. F. et al.
Object Type:
Article
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
A Dynamically Adaptive Arbitrary Lagrangian-Eulerian Method for Solution of the Euler Equations
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 methods are driven by the need to reconcile traditional AMR techniques with the staggered variables and moving, deforming meshes associated with Lagrange based ALE schemes. We develop interlevel solution transfer operators and interlevel boundary conditions first in the case of purely Lagrangian hydrodynamics, and then extend these ideas into an ALE method by developing adaptive extensions of elliptic mesh relaxation techniques. Conservation properties of the method are analyzed, and a series of test problem calculations are presented which demonstrate the utility and efficiency of the method.
Date:
February 14, 2003
Creator:
Anderson, R W; Elliott, N S & Pember, R B
Object Type:
Article
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 106, No. 266, Ed. 1 Monday, February 14, 2005
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
February 14, 2005
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
On-Machine Acceptance
Probing processes are used intermittently and not effectively as an on-line measurement device. This project was needed to evolve machine probing from merely a setup aid to an on-the-machine inspection system. Use of probing for on-machine inspection would significantly decrease cycle time by elimination of the need for first-piece inspection (at a remote location). Federal Manufacturing and Technologies (FM and T) had the manufacturing facility and the ability to integrate the system into production. The Contractor had a system that could optimize the machine tool to compensate for thermal growth and related error.
Date:
February 14, 2000
Creator:
Arnold, K. F.
Object Type:
Report
System:
The UNT Digital Library
EMS IMPLEMENTATION COSTS AT A DOE NATIONAL LABORATORY
None
Date:
February 14, 2000
Creator:
BRIGGS,S.L.K.
Object Type:
Article
System:
The UNT Digital Library
Electron-impact ionization of atomic hydrogen
Since the invention of quantum mechanics, even the simplest example of collisional breakup in a system of charged particles, e{sup {minus}} + H {r_arrow} H{sup +} + e{sup {minus}} + e{sup {minus}}, has stood as one of the last unsolved fundamental problems in atomic physics. A complete solution requires calculating the energies and directions for a final state in which three charged particles are moving apart. Advances in the formal description of three-body breakup have yet to lead to a viable computational method. Traditional approaches, based on two-body formalisms, have been unable to produce differential cross sections for the three-body final state. Now, by using a mathematical transformation of the Schrodinger equation that makes the final state tractable, a complete solution has finally been achieved, Under this transformation, the scattering wave function can be calculated without imposing explicit scattering boundary conditions. This approach has produced the first triple differential cross sections that agree on an absolute scale with experiment as well as the first ab initio calculations of the single differential cross section.
Date:
February 14, 2000
Creator:
Baertschy, Mark D.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Field Demonstration of a Membrane Process to Recover Heavy Hydrocarbons and to Remove Water From Natural Gas Annual Report: 2002
The objective of this project is to design, construct and field demonstrate a membrane system to recover natural gas liquids (NGL) and remove water from raw natural gas. An extended field test to demonstrate system performance under real-world conditions would convince industry users of the efficiency and reliability of the process. The system has been designed and fabricated by Membrane Technology and Research, Inc. (MTR) and will be installed and operated at British Petroleum (BP)-Amoco's Pascagoula, MS plant. The Gas Research Institute will partially support the field demonstration and BP-Amoco will help install the unit and provide onsite operators and utilities. The gas processed by the membrane system will meet pipeline specifications for dewpoint and Btu value and can be delivered without further treatment to the pipeline. Based on data from prior membrane module tests, the process is likely to be significantly less expensive than glycol dehydration followed by propane refrigeration, the principal competitive technology. At the end of this demonstration project the process will be ready for commercialization. The route to commercialization will be developed during this project and may involve collaboration with other companies already servicing the natural gas processing industry.
Date:
February 14, 2003
Creator:
Baker, R.; Hofmann, R. & Lokhandwala, K. A.
Object Type:
Report
System:
The UNT Digital Library
15th Street News (Midwest City, Okla.), Vol. 32, No. 17, Ed. 1 Friday, February 14, 2003
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
February 14, 2003
Creator:
Baldwin, Alisha
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Strategic Petroleum Reserve: History, Perspectives, and Issues
None
Date:
February 14, 2008
Creator:
Bamberger, Robert
Object Type:
Report
System:
The UNT Digital Library
Strategic Petroleum Reserve
None
Date:
February 14, 2003
Creator:
Bamberger, Robert L.
Object Type:
Report
System:
The UNT Digital Library
Model Results Of The Draining Of Tank 25 Interstial Liquid
SRNL was tasked to simulate the draining of interstitial liquid from Tank 25 saltcake which is scheduled to take place in 2005. The salt processing plan baseline identifies a target of 135,000 gallons of interstitial liquid to be removed from Tank 25. Due to the uncertainty of the Tank 25 material properties and conditions, several cases were modeled varying the saltcake and interstitial liquid properties. The cases present a wide range of performance. The nominal baseline, case 1, removed the 135,000 gallons in approximately 1,030 hours of pump operation. The cases with optimal drain characteristics (high intrinsic permeability, high temp.) drain the 135,000 gallons in less time. Those with less favorable drain conditions did not approach the 135,000 gallons in a reasonable amount of time. Common to all cases unable to achieve the target volume was the low temperature at which they were run, 30 C (the lowest modeled), though there were additional contributing factors. A summary of the results are shown in Table 1.
Date:
February 14, 2005
Creator:
Barnes, C. D. & Flach, G. P.
Object Type:
Report
System:
The UNT Digital Library
FIND: Fluorescence Imaging in the Nuclear Domain
This document examines the potential use of Thomson-Radiated Extreme X-ray (T-REX) sources for Fluorescence Imaging in the Nuclear Domain (FIND) of special nuclear materials. A back-of-the-envelope, relative comparison of T-REX sources vs. Bremsstrahlung sources for this application is presented. It is estimated that use of T-REX for FIND could be as much as 5 x 10{sup 12} more effective than the use of anode based sources. Furthermore it is estimated that illumination of samples of dimension 1 cm on a side could produce up to {approx}10{sup 9} detectable photons per second.
Date:
February 14, 2005
Creator:
Barty, C J
Object Type:
Report
System:
The UNT Digital Library
Performance Enhancement of the Automated Concrete Evaluation System (ACES)
The objective of this proposed research is to improve and expand the detection and analysis capabilities of the automated, concrete evaluation (ACE) system. MoDOT and Honeywell jointly developed this system. The focus of this proposed research will be on the following: Coordination of concrete imaging efforts with other states, Validation and testing of the ACE system on a broad range of concrete samples, and Identification and development of software and hardware enhancements. These enhancements will meet the needs of diverse users in the field of concrete materials, construction, and research.
Date:
February 14, 2002
Creator:
Baumgart,C.W.; Cave,S.P. & Linder,K.E.
Object Type:
Report
System:
The UNT Digital Library
Oral History Interview with Harlie Beale, February 14, 2008
The National Museum of the Pacific War presents an oral interview with Harlie Beale. Beale joined the Navy in 1942 and was assigned to the USS Patuxent (AO-44) as a seaman. In September 1944 he had the opportunity to strike for quartermaster and joined the bridge gang. One of Beale’s most daunting experiences was enduring a typhoon near Ulithi. He found it tiring to stand on the bridge, and terrifying to see nearby destroyers tossed about like toys. At Iwo Jima, Beale learned of plans to support air raids over Japan. But when a magazine hoist sparked and ignited leaking aviation gas, causing an explosion that lifted the ship up 40 feet, the Patuxent was diverted for repairs. Later, at Okinawa, Beale saw a kamikaze strike a nearby ship. When the crew of the Patuxent learned of the end of the war, they sang in celebration. The Patuxent joined the USS Missouri (BB-63) at the signing of the armistice in Tokyo Bay, where Beale saw Japanese civilians out with white flags. Beale returned home after 18 months at sea.
Date:
February 14, 2008
Creator:
Beale, Harlie
Object Type:
Sound
System:
The Portal to Texas History
Oral History Interview with Harlie Beale, February 14, 2008
The National Museum of the Pacific War presents an oral interview with Harlie Beale. Beale joined the Navy in 1942 and was assigned to the USS Patuxent (AO-44) as a seaman. In September 1944 he had the opportunity to strike for quartermaster and joined the bridge gang. One of Beale’s most daunting experiences was enduring a typhoon near Ulithi. He found it tiring to stand on the bridge, and terrifying to see nearby destroyers tossed about like toys. At Iwo Jima, Beale learned of plans to support air raids over Japan. But when a magazine hoist sparked and ignited leaking aviation gas, causing an explosion that lifted the ship up 40 feet, the Patuxent was diverted for repairs. Later, at Okinawa, Beale saw a kamikaze strike a nearby ship. When the crew of the Patuxent learned of the end of the war, they sang in celebration. The Patuxent joined the USS Missouri (BB-63) at the signing of the armistice in Tokyo Bay, where Beale saw Japanese civilians out with white flags. Beale returned home after 18 months at sea.
Date:
February 14, 2008
Creator:
Beale, Harlie
Object Type:
Text
System:
The Portal to Texas History
Rare Decay Results from KTeV and ({rho}{sub CKM}, {eta}{sub CKM})
Rare decay results from KTeV are reviewed, emphasizing modes that in principle provide information about the CKM matrix. The KTeV results shown here are from the 1997 data sample, which consists of about 2.7 x 10{sup 11} K{sub L}{sup 0} decay samples. KTeV also took data in 1999, giving a total data sample about 2.5 times what is presented here for three body decays and about 3.2 times what is presented here for four body decays. A summary of the KTeV detector is in the Appendix. Our recent results in lepton flavor violating modes are also presented.
Date:
February 14, 2001
Creator:
Bellantoni, L.
Object Type:
Article
System:
The UNT Digital Library
Raising the Level of Programming Abstraction in Scalable Programming Models
The complexity of modern scientific simulations combined with the complexity of the high-performance computer hardware on which they run places an ever-increasing burden on scientific software developers, with clear impacts on both productivity and performance. We argue that raising the level of abstraction of the programming model/environment is a key element of addressing this situation. We present examples of two distinctly different approaches to raising the level of abstraction of the programming model while maintaining or increasing performance: the Tensor Contraction engine, a narrowly-focused domain specific language together with an optimizing compiler; and Extended Global Arrays, a programming framework that integrates programming models dealing with different layers of the memory/storage hierarchy using compiler analysis and code transformation techniques.
Date:
February 14, 2004
Creator:
Bernholdt, David E.; Nieplocha, Jarek & Sadayappan, Ponnuswamy
Object Type:
Article
System:
The UNT Digital Library