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462 Matching Results
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High-purity, isotopically enriched bulk silicon
The synthesis and characterization of dislocation-free, undoped, single crystals of Si enriched in all 3 stable isotopes is reported: {sup 28}Si (99.92%), {sup 29}Si (91.37%), and {sup 30}Si (89.8%). A silane-based process compatible with the relatively small amounts of isotopically enriched precursors that are practically available was used. The silane is decomposed to silicon on a graphite starter rod heated to 700-750 C in a recirculating flow reactor. A typical run produces 35 gm of polycrystalline Si at a growth rates of 5 {micro}m/min and conversion efficiency >95%. Single crystals are grown by the floating zone method and characterized by electrical and optical measurements. Concentrations of shallow dopants (P and B) are as low as mid-10{sup 13} cm{sup -3}. Concentrations of C and O lie below 10{sup 16} and 10{sup 15} cm{sup -3}, respectively.
Date:
November 17, 2004
Creator:
Ager, J. W., III; Beeman, J. W.; Hansen, W. L.; Haller, E. E.; Sharp, I. D.; Liao, C. et al.
Object Type:
Article
System:
The UNT Digital Library
Reduction of U(VI) Complexes by Anthraquinone Disulfonate: Experiment and Molecular Modeling
Past studies demonstrate that complexation will limit abiotic and biotic U(VI) reduction rates and the overall extent of reduction. However, the underlying basis for this behavior is not understood and presently unpredictable across species and ligand structure. The central tenets of these investigations are: (1) reduction of U(VI) follows the electron-transfer (ET) mechanism developed by Marcus; (2) the ET rate is the rate-limiting step in U(VI) reduction and is the step that is most affected by complexation; and (3) Marcus theory can be used to unify the apparently disparate U(VI) reduction rate data and as a computational tool to construct a predictive relationship.
Date:
March 17, 2004
Creator:
Ainsworth, C. C.; Wang, Z.; Rosso, K. M.; Wagnon, K. & Fredrickson, J. K.
Object Type:
Presentation
System:
The UNT Digital Library
MODELING THE TRANSPORT AND CHEMICAL EVOLUTION OF ONSHORE AND OFFSHORE EMISSIONS AND THEIR IMPACT ON LOCAL AND REGIONAL AIR QUALITY USING A VARIABLE-GRID-RESOLUTION AIR QUALITY MODEL
None
Date:
May 17, 2004
Creator:
Alapaty, Kiran
Object Type:
Report
System:
The UNT Digital Library
Timpson & Tenaha News (Timpson, Tex.), Vol. 19, No. 25, Ed. 1 Thursday, June 17, 2004
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
June 17, 2004
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Women in the United States Congress: 1917-2004
This report identifies the names, committee assignments, dates of service, and (for Representatives) districts of the 219 women Members of Congress.
Date:
March 17, 2004
Creator:
Amer, Mildred L.
Object Type:
Report
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 105, No. 288, Ed. 1 Tuesday, February 17, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
February 17, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 105, No. 313, Ed. 1 Wednesday, March 17, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
March 17, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 106, No. 40, Ed. 1 Monday, May 17, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
May 17, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 106, No. 67, Ed. 1 Thursday, June 17, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
June 17, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 106, No. 118, Ed. 1 Tuesday, August 17, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
August 17, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 106, No. 145, Ed. 1 Friday, September 17, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
September 17, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 106, No. 170, Ed. 1 Sunday, October 17, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
October 17, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 106, No. 190, Ed. 1 Wednesday, November 17, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
November 17, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 106, No. 216, Ed. 1 Friday, December 17, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 17, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Oral History Interview with Felix Appleton, February 17, 2004
The National Museum of the Pacific War presents an oral interview with Felix “George” Appleton. Appleton was born in Lawrenceburg, Tennessee, 21 July 1924. He enlisted in the US Navy in 1943 and following boot camp, entered the hospital corps school. Later he went aboard USS LST-523 and sailed in convoy to England and witnessed submarine attacks and a number of ships being lost. He tells of participating in Operation Overlord with Omaha Beach being USS LST-523’s objective. He describes the carnage he witnessed both in the water and on the beach. After off-loading supplies, the ship was designated a hospital ship and he describes the various combat injuries he treated. The ship made numerous trips between England and the Normandy beaches until the ship struck a mine and sank. Numerous fatalities occurred among the doctors and medical staff. He was treated for minor wounds and ultimately returned to the United States on HMS Queen Elizabeth. He was assigned to the Lambert Naval Air Station at St. Louis, Missouri until his discharge in 1946.
Date:
February 17, 2004
Creator:
Appleton, Felix
Object Type:
Sound
System:
The Portal to Texas History
Oral History Interview with Felix Appleton, February 17, 2004
The National Museum of the Pacific War presents an oral interview with Felix “George” Appleton. Appleton was born in Lawrenceburg, Tennessee, 21 July 1924. He enlisted in the US Navy in 1943 and following boot camp, entered the hospital corps school. Later he went aboard USS LST-523 and sailed in convoy to England and witnessed submarine attacks and a number of ships being lost. He tells of participating in Operation Overlord with Omaha Beach being USS LST-523’s objective. He describes the carnage he witnessed both in the water and on the beach. After off-loading supplies, the ship was designated a hospital ship and he describes the various combat injuries he treated. The ship made numerous trips between England and the Normandy beaches until the ship struck a mine and sank. Numerous fatalities occurred among the doctors and medical staff. He was treated for minor wounds and ultimately returned to the United States on HMS Queen Elizabeth. He was assigned to the Lambert Naval Air Station at St. Louis, Missouri until his discharge in 1946.
Date:
February 17, 2004
Creator:
Appleton, Felix
Object Type:
Text
System:
The Portal to Texas History
Driving Mechanism of SOL Plasma Flow and Effects on the Divertor Performance in JT-60U
None
Date:
May 17, 2004
Creator:
Asakura, N.; Takenaga, H.; Sakurai, S.; Porter, G.; Rognlien, T.; Rensink, M. et al.
Object Type:
Article
System:
The UNT Digital Library
Gas Turbine Reheat Using in Situ Combustion: Final Report, Draft
In situ reheat is an alternative to traditional gas turbine reheat design in which fuel is fed through airfoils rather than in a bulky discrete combustor separating HP and LP turbines. The goals are to achieve increased power output and/or efficiency without higher emissions. In this program the scientific basis for achieving burnout with low emissions has been explored. In Task 1, Blade Path Aerodynamics, design options were evaluated using CFD in terms of burnout, increase of power output, and possible hot streaking. It was concluded that Vane 1 injection in a conventional 4-stage turbine was preferred. Vane 2 injection after vane 1 injection was possible, but of marginal benefit. In Task 2, Combustion and Emissions, detailed chemical kinetics modeling, validated by Task 3, Sub-Scale Testing, experiments, resulted in the same conclusions, with the added conclusion that some increase in emissions was expected. In Task 4, Conceptual Design and Development Plan, Siemens Westinghouse power cycle analysis software was used to evaluate alternative in situ reheat design options. Only single stage reheat, via vane 1, was found to have merit, consistent with prior Tasks. Unifying the results of all the tasks, a conceptual design for single stage reheat utilizing 24 holes, …
Date:
May 17, 2004
Creator:
Bachovchin, D. M.; Lippert, T. E.; Newby, R. A. & Cizmas, P. G. A.
Object Type:
Report
System:
The UNT Digital Library
Design and progress toward a multi-conjugate adaptive optics system for distributed aberration correction
This article investigates the use of a multi-conjugate adaptive optics system to improve the field-of-view for the system. The emphasis of this research is to develop techniques to improve the performance of optical systems with applications to horizontal imaging. The design and wave optics simulations of the proposed system are given. Preliminary results from the multi-conjugate adaptive optics system are also presented. The experimental system utilizes a liquid-crystal spatial light modulator and an interferometric wave-front sensor for correction and sensing of the phase aberrations, respectively.
Date:
August 17, 2004
Creator:
Baker, K.; Olivier, S.; Tucker, J.; Silva, D.; Gavel, D.; Lim, R. et al.
Object Type:
Article
System:
The UNT Digital Library
Fundamental Understanding of Crack Growth in Structural Components of Generation IV Supercritical Light Water Reactors
This work contributes to the design of safe and economical Generation-IV Super-Critical Water Reactors (SCWRs) by providing a basis for selecting structural materials to ensure the functionality of in-vessel components during the entire service life. During the second year of the project, we completed electrochemical characterization of the oxide film properties and investigation of crack initiation and propagation for candidate structural materials steels under supercritical conditions. We ranked candidate alloys against their susceptibility to environmentally assisted degradation based on the in situ data measure with an SRI-designed controlled distance electrochemistry (CDE) arrangement. A correlation between measurable oxide film properties and susceptibility of austenitic steels to environmentally assisted degradation was observed experimentally. One of the major practical results of the present work is the experimentally proven ability of the economical CDE technique to supply in situ data for ranking candidate structural materials for Generation-IV SCRs. A potential use of the CDE arrangement developed ar SRI for building in situ sensors monitoring water chemistry in the heat transport circuit of Generation-IV SCWRs was evaluated and proved to be feasible.
Date:
November 17, 2004
Creator:
Balachov, Iouri I.; Kobayashi, Takao; Tanzella, Francis; Jayaweera, Indira; Jayaweera, Palitha; Kinnunen, Petri et al.
Object Type:
Report
System:
The UNT Digital Library
Group Theoretical Analysis of Vibrational Modes, Rovibronic Levels and Nuclear Spin Statistics of extended aromatic C48N12 Azafullerene
We have presented a group theoretical analysis of the vibrational modes and rovibronic levels of a novel extended aromatic C{sub 48}N{sub 12} azafullerene. The nuclear spin multiplets and statistical weights of {sup 14}N spin-1 bosons, vibrational and rotational analysis and computed vibrational spectra are provided. We have also predicted the properties of the {sup 3}A{sub u}, {sup 3}E{sub g}, and {sup 3}E{sub u} excited states of C{sub 48}N{sub 12} that lie 1.9 eV above the {sup 1}A{sub g} ground state, and that the {sup 3}E{sub g} and {sup 3}E{sub u} states would undergo Jahn-Teller distortion into chiral structures with no symmetry and an achiral structure with C{sub i} symmetry.
Date:
March 17, 2004
Creator:
Balasubramanian, K
Object Type:
Article
System:
The UNT Digital Library
Spectroscopic Properties of Novel Aromatic Metal Clusters: NaM4 (M=Al, Ga, In) and their Cations and Anions
The ground and several excited states of metal aromatic clusters, namely NaM4 and NaM{sub 4}{sup {+-}} (M=Al, Ga, In) clusters have been investigated by employing complete activespace self-consistent-field (CASSCF) followed by Multi-reference singles and doubles configuration interaction (MRSDCI) computations that included up to 10 million configurations and other methods. The ground states NaM{sub 4}{sup -} of aromatic anions are found to be symmetric C{sub 4v} ({sup 1}A{sub 1}) electronic states with ideal square pyramid geometries. While the ground state of NaIn4 is also predicted to be a symmetric C{sub 4v} ({sup 2}A{sub 1}) square pyramid, the ground state of the NaAl4 cluster is found to have a C{sub 2v} ({sup 2}A{sub 1}) pyramid with a rhombus base and the ground state of NaGa{sub 4} possesses a C{sub 2v} ({sup 2}A{sub 1}) pyramid with a rectangle base. In general these structures exhibit 2 competing geometries, viz., an ideal C{sub 4v} structure and a distorted rhomboidal or rectangular pyramid structure (C{sub 2v}). All of the ground states of the NaM{sub 4}{sup +} (M= Al, Ga, In) cations are computed to be C{sub 2v} ({sup 3}A{sub 2}) pyramids with rhombus bases. The equilibrium geometries, vibrational frequencies, dissociation energies, adiabatic ionization potentials, adiabatic electron …
Date:
March 17, 2004
Creator:
Balasubramanian, K & Zhao, C
Object Type:
Article
System:
The UNT Digital Library
Automobile and Light Truck Fuel Economy: The CAFE Standards
This report is about Automobile and Light Truck Fuel Economy.
Date:
September 17, 2004
Creator:
Bamberger, Robert
Object Type:
Report
System:
The UNT Digital Library
Alaska Emergency Management and Homeland Security Statutory Authorities Summarized
This report is one of a series that profiles the emergency management and homeland security statutory authorities of the 50 states, the District of Columbia, the Commonwealth of the Northern Mariana Islands, the Commonwealth of Puerto Rico, and three territories (American Samoa, Guam, and the U.S. Virgin Islands). Each profile identifies the more significant elements of state statutes, generally as codified. This report focuses on the state of Alaska.
Date:
March 17, 2004
Creator:
Bea, Keith; Richardson, Pat; Runyon, L. Cheryl & Warnock, Kae M.
Object Type:
Report
System:
The UNT Digital Library