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649 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
Modeling the Cathodic Region in Crevice Corrosion Under a Thin Electrolyte Film Including Particulates
Crevice corrosion may be limited by the capacity of the external cathodic region to support anodic dissolution currents within the crevice. The analysis here focuses on behavior of metal surfaces covered by a thin ({approx}microns) layer of the electrolyte film including particulates. The particulates can affect the cathode current capacity (I{sub total}) by increasing the solution resistance (''volume effect'') and by decreasing the electrode area (''surface effect''). In addition, there can be particulate effects on oxygen reduction kinetics and oxygen transport. This work simulates and characterizes the effect of a uniform particulate monolayer on the cathode current capacity for steady state conditions in the presence of a thin electrolyte film. Particulate configurations with varying particle size, shape, arrangement, volume fraction, and electrode area coverage were numerically modeled as a function of the properties of the system. It is observed that the effects of particles can be fully accounted for in terms of two corrections: the volume blockage effect on the electrolyte resistivity can be correlated using Bruggeman's equation, and the electrode coverage effect can be modeled in terms of a simple area correction to the kinetics expression. For the range of parameters analyzed, applying these two correction factors, cathodes covered …
Date:
March 14, 2006
Creator:
Agarwal, A. S.; Landau, U.; Shan, X. & Payer, J. H.
Object Type:
Report
System:
The UNT Digital Library
On the Increasing Fragility of Human Teeth with Age: ADeep-Ultraviolet Resonance Raman Study
Ultraviolet resonance Raman spectroscopy (UVRRS) using 244nm excitation was used to investigate the impact of aging on humandentin. The intensity of a spectroscopic feature from the peptide bondsin the collagen increases with tissue age, similar to a finding reportedpreviously for human cortical bone.
Date:
July 14, 2006
Creator:
Ager, J. W., III; Nalla, R. K.; Balooch, G.; Kim, G.; Pugach, M.; Habelitz, S. et al.
Object Type:
Article
System:
The UNT Digital Library
Development Of A Novel Catalyst For No Decomposition
Air pollution arising from the emission of nitrogen oxides as a result of combustion taking place in boilers, furnaces and engines, has increasingly been recognized as a problem. New methods to remove NO{sub x} emissions significantly and economically must be developed. The current technology for post-combustion removal of NO is the selective catalytic reduction (SCR) of NO by ammonia or possibly by a hydrocarbon such as methane. The catalytic decomposition of NO to give N2 will be preferable to the SCR process because it will eliminate the costs and operating problems associated with the use of an external reducing species. The most promising decomposition catalysts are transition metal (especially copper)-exchanged zeolites, perovskites, and noble metals supported on metal oxides such as alumina, silica, and ceria. The main shortcoming of the noble metal reducible oxide (NMRO) catalysts is that they are prone to deactivation by oxygen. It has been reported that catalysts containing tin oxide show oxygen adsorption behavior that may involve hydroxyl groups attached to the tin oxide. This is different than that observed with other noble metal-metal oxide combinations, which have the oxygen adsorbing on the noble metal and subsequently spilling over to the metal oxide. This observation leads …
Date:
September 14, 2006
Creator:
Akyurtlu, Ates & Akyurtlu, Jale F.
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
Development of a CO2 Sequestration Module by Integrating Mineral Activation and Aqueous Carbonation
Mineral carbonation is a promising concept for permanent CO{sub 2} sequestration due to the vast natural abundance of the raw materials and the permanent storage of CO{sub 2} in solid form as carbonates. The sequestration of CO{sub 2} through the employment of magnesium silicates--olivine and serpentine--is beyond the proof of concept stage. For the work done in this project, serpentine was chosen as the feedstock mineral due to its abundance and availability. Although the reactivity of olivine is greater than that of serpentine, physical and chemical treatments have been shown to increase greatly the reactivity of serpentine. The primary drawback to mineral carbonation is reaction kinetics. To accelerate the carbonation, aqueous processes are preferred, where the minerals are first dissolved in solution. In aqueous carbonation, the key step is the dissolution rate of the mineral, where the mineral dissolution reaction is likely to be surface-controlled. The relatively low reactivity of serpentine has warranted research into physical and chemical treatments that have been shown to greatly increase its reactivity. The use of sulfuric acid as an accelerating medium for the removal of magnesium from serpentine has been investigated. To accelerate the dissolution process, the mineral can be ground to very fine …
Date:
August 14, 2006
Creator:
Alexander, George; Aksoy, Parvana; Andresen, John; Maroto-Valer, Mercedes & Schobert, Harold
Object Type:
Report
System:
The UNT Digital Library
Timpson & Tenaha News (Timpson, Tex.), Vol. 21, No. 37, Ed. 1 Thursday, September 14, 2006
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
September 14, 2006
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Timpson & Tenaha News (Timpson, Tex.), Vol. 21, No. 50, Ed. 1 Thursday, December 14, 2006
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
December 14, 2006
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
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
3rd year final contractor report for: U.S. Department of Energy Stewardship Science Academic Alliances Program Project Title: Detailed Measurements of Rayleigh-Taylor Mixing at Large and Small Atwood Numbers
This project had two major tasks: Task 1. The construction of a new air/helium facility to collect detailed measurements of Rayleigh-Taylor (RT) mixing at high Atwood number, and the distribution of these data to LLNL, LANL, and Alliance members for code validation and design purposes. Task 2. The collection of initial condition data from the new Air/Helium facility, for use with validation of RT simulation codes at LLNL and LANL. This report describes work done in the last twelve (12) months of the project, and also contains a summary of the complete work done over the three (3) life of the project. As of April 1, 2006, the air/helium facility (Task 1) is now complete and extensive testing and validation of diagnostics has been performed. Initial condition studies (Task 2) is also comp lete. Detailed experiments with air/helium with Atwood numbers up to 0.1 have been completed, and Atwood numbers of 0.25. Within the last three (3) months we have been able to successfully run the facility at Atwood numbers of 0.5. The progress matches the project plan, as does the budget. We have finished the initial condition studies using the water channel, and this work has been accepted for …
Date:
April 14, 2006
Creator:
Andrews, Malcolm J.
Object Type:
Report
System:
The UNT Digital Library
Measurements of B meson decays to (omega)K* and (omega)(rho)
The authors describe searches for B meson decays to the charmless vector-vector final states {omega}K* and {omega}{rho} in 89 million B{bar B} pairs produced in e{sup +}e{sup -} annihilation at {radical}s = 10.58 GeV.
Date:
March 14, 2006
Creator:
Aubert, B.; Cheng, C. H.; Lange, D. J.; Simani, M. C.; Wright, D. M.; Abrams, G. S. et al.
Object Type:
Article
System:
The UNT Digital Library
PROCEEDINGS OF RIKEN BNL RESEARCH CENTER WORKSHOP ENTITLED: "PARTON ORBITAL ANGULAR MOMENTUM" VOLUME 81.
None
Date:
June 14, 2006
Creator:
BUNCE, G.; FIELDS, D. & VOGELSANG, W.
Object Type:
Article
System:
The UNT Digital Library
High-Precision Resonant Cavity Beam Position, Emittance And Third-Moment Monitors
Linear colliders and FEL facilities need fast, nondestructive beam position and profile monitors to facilitate machine tune-up, and for use with feedback control. FAR-TECH, Inc., in collaboration with SLAC, is developing a resonant cavity diagnostic to simultaneously measure the dipole, quadrupole and sextupole moments of the beam distribution. Measurements of dipole and quadrupole moments at multiple locations yield information about beam orbit and emittance. The sextupole moment can reveal information about beam asymmetry which is useful in diagnosing beam tail deflections caused by short-range dipole wakefields. In addition to the resonance enhancement of a single-cell cavity, use of a multi-cell standing-wave structure further enhances signal strength and improves the resolution of the device. An estimated resolution is better than 1 {micro}m in rms beam size and better than 1 nm in beam position.
Date:
March 14, 2006
Creator:
Barov, N.; Kim, J. S.; Weidemann, A. W.; Miller, R. H. & Nantista, C. D.
Object Type:
Article
System:
The UNT Digital Library
Measurement of cross sections for alpha-induced reactions on 197Au and thick-target yields for the ((alpha),(gamma)) process on 64Zn and 63Cu
We have measured the cross sections for the {sup 197}Au({alpha},{gamma}){sup 201}Tl and {sup 197}Au({alpha},2n){sup 199}Tl reactions in the 17.9- to 23.9-MeV energy range, and {sup 197}Au({alpha},n){sup 200}Tl reaction in the 13.4- to 23.9-MeV energy range using an activation technique. Thick-target yields for the {sup 64}Zn({alpha},{gamma}){sup 68}Ge (7- to 14-MeV) and {sup 63}Cu({alpha},{gamma}){sup 67}Ga (7-MeV) reactions were measured. For all measurements, natural elements were bombarded with He{sup +} beams from the 88'' Cyclotron at the Lawrence Berkeley National Laboratory (LBNL). Irradiated samples were counted using a g-spectrometry system at LBNL's Low Background Facility. Measured {sup 197}Au({alpha},{gamma}){sup 201}Tl cross-sections were compared with the NON-SMOKER theoretical values. The thick-target yields for the {sup 64}Zn({alpha},{gamma}){sup 68}Ge and {sup 63}Cu({alpha},{gamma}){sup 67}Ga reactions are also compared with the theoretical yield, calculated numerically using the energy dependent NON-SMOKER cross section data. In both cases, measured values are found to follow a trend of overlapping the predicted value near the alpha nucleus barrier height and fall below with a slowly widening difference between them in the sub barrier energy points.
Date:
August 14, 2006
Creator:
Basunia, M. S.; Shugart, H. A.; Smith, A. R. & Norman, E. B.
Object Type:
Article
System:
The UNT Digital Library
The Grandview Tribune (Grandview, Tex.), Vol. 111, No. 32, Ed. 1 Friday, April 14, 2006
Weekly newspaper from Grandview, Texas that includes local, state, and national news along with advertising.
Date:
April 14, 2006
Creator:
Beck-Adams, Candie
Object Type:
Newspaper
System:
The Portal to Texas History
The Grandview Tribune (Grandview, Tex.), Vol. 111, No. 44, Ed. 1 Friday, July 14, 2006
Weekly newspaper from Grandview, Texas that includes local, state, and national news along with advertising.
Date:
July 14, 2006
Creator:
Beck-Adams, Candie
Object Type:
Newspaper
System:
The Portal to Texas History
Humane Treatment of Farm Animals: Overview and Issues
None
Date:
August 14, 2006
Creator:
Becker, Geoffrey S.
Object Type:
Report
System:
The UNT Digital Library
The Cost of Iraq, Afghanistan, and Other Global War on Terror Operations Since 9/11
With the passing of FY2006 supplemental bill H.R. 4939, Congress will have appropriated a total of about $437 billion for the three military operations initiated since the 9/11 attacks: Operation Enduring Freedom (OEF) covering Afghanistan and other Global War on Terror (GWOT) operations, Operation Noble Eagle (ONE) providing enhanced security at military bases, and Operation Iraqi Freedom (OIF), Iraq. On a monthly basis, the Department of Defense (DOD) spent an average of about $6.4 billion for OIF, $1.3 billion for OEF, and $180 million for enhanced base security in FY2005. Potential oversight issues for Congress include getting estimates of the cost to repair and replae war-worn equipment and of possible offsetting costs to DOD's regular budget because equipment is being fixed or bought earlier than planned. DOD's annual war funding may reach $118 billion in FY2006 if the pending supplemental is enacted.
Date:
June 14, 2006
Creator:
Belasco, Amy
Object Type:
Report
System:
The UNT Digital Library
Cost of Iraq, Afghanistan, and Other Global War on Terror Operations Since 9/11
This report details the total cost of counterterrorism operations in the Global War on Terror (GWOT) since the September 2001 terrorist attacks on the United States. This report also includes descriptions of relevant budgetary legislation.
Date:
June 14, 2006
Creator:
Belasco, Amy
Object Type:
Report
System:
The UNT Digital Library
Alley in Breckenridge
Photograph of an alley scene in Breckenridge, Texas. There is a green dumpster to the far left of the photograph. Next to it is a white sign with black lettering that says "One Way Do Not Enter." A car drives through the alley. A fire escape can be seen on the third building in the background.
Date:
April 14, 2006
Creator:
Belden, Dreanna L.
Object Type:
Photograph
System:
The Portal to Texas History
Baker Hotel, Mineral Wells
Photograph of the Baker Hotel in Mineral Wells, built 1929 by architects Wyatt C. Hendrick and Co. Architects. It has been vacant since 1972.
Date:
April 14, 2006
Creator:
Belden, Dreanna L.
Object Type:
Photograph
System:
The Portal to Texas History
Baker Hotel, Mineral Wells
Photograph of the Baker Hotel in Mineral Wells, built 1929 by architects Wyatt C. Hendrick and Co. Architects. It has been vacant since 1972. The building is at least twelve stories tall.
Date:
April 14, 2006
Creator:
Belden, Dreanna L.
Object Type:
Photograph
System:
The Portal to Texas History
Baker Hotel, Mineral Wells
Photograph of the front of the Baker Hotel in Mineral Wells, built 1929 by architects Wyatt C. Hendrick and Co. Architects. It has been vacant since 1972. It is at least twelve stories tall.
Date:
April 14, 2006
Creator:
Belden, Dreanna L.
Object Type:
Photograph
System:
The Portal to Texas History
Baker Hotel, Mineral Wells, colonnade
Photograph of the colonnade near the front entrance of the Baker Hotel in Mineral Wells, Texas. It was built in 1929 by architects Wyatt C. Hendrick and Co. Architects. It has been vacant since 1972. The floor is made of red brick, and the walls of slightly lighter brick.
Date:
April 14, 2006
Creator:
Belden, Dreanna L.
Object Type:
Photograph
System:
The Portal to Texas History