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129 Matching Results
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Identification of isotopically primitive interplanetary dust particles: A NanoSIMS isotopic imaging study
We have carried out a comprehensive survey of the isotopic compositions (H, B, C, N, O, S) of a suite of interplanetary dust particles (IDPs), including both cluster and individual particles. Isotopic imaging with the NanoSIMS shows the presence of numerous discrete hotspots that are strongly enriched in {sup 15}N, including the largest {sup 15}N enrichments ({approx}1300 {per_thousand}) observed in IDPs to date. A number of the IDPs also contain larger regions with more modest enrichments in {sup 15}N, leading to average bulk N isotopic compositions that are {sup 15}N-enriched in these IDPs. Although C isotopic compositions are normal in most of the IDPs, two {sup 15}N-rich N-hotspots have correlated {sup 13}C anomalies. CN{sup -}/C{sup -} ratios suggest that most of the {sup 15}N-rich hotspots are associated with relatively N-poor carbonaceous matter, although specific carriers have not been determined. H isotopic distributions are similar to those of N: D anomalies are present both as distinct very D-rich hotspots and as larger regions with more modest enrichments. Nevertheless, H and N isotopic anomalies are not directly correlated, consistent with results from previous studies. Oxygen isotopic imaging shows the presence of abundant presolar silicate grains in the IDPs. The O isotopic compositions …
Date:
September 2, 2005
Creator:
Floss, C; Stadermann, F J; Bradley, J P; Dai, Z R; Bajt, S; Graham, G et al.
Object Type:
Article
System:
The UNT Digital Library
Angle Resolved Photoemission Spectroscopy Studies of the Mott Insulator to Superconductor Evolution in Ca2-xNaxCuO2Cl2
It is widely believed that many of the exotic physical properties of the high-T{sub c} cuprate superconductors arise from the proximity of these materials to the strongly correlated, antiferromagnetic Mott insulating state. Therefore, one of the fundamental questions in the field of high-temperature superconductivity is to understand the insulator-to-superconductor transition and precisely how the electronic structure of Mott insulator evolves as the first holes are doped into the system. This dissertation presents high-resolution, doping dependent angle-resolved photoemission (ARPES) studies of the cuprate superconductor Ca{sub 2-x}Na{sub x}CuO{sub 2}Cl{sub 2}, spanning from the undoped parent Mott insulator to a high-temperature superconductor with a T{sub c} of 22 K. A phenomenological model is proposed to explain how the spectral lineshape, the quasiparticle band dispersion, and the chemical potential all progress with doping in a logical and self-consistent framework. This model is based on Franck-Condon broadening observed in polaronic systems where strong electron-boson interactions cause the quasiparticle residue, Z, to be vanishingly small. Comparisons of the low-lying states to different electronic states in the valence band strongly suggest that the coupling of the photohole to the lattice (i.e. lattice polaron formation) is the dominant broadening mechanism for the lower Hubbard band states. Combining this …
Date:
September 2, 2005
Creator:
Shen, Kyle Michael
Object Type:
Report
System:
The UNT Digital Library
Advanced Control Technologies and Strategies Linking DemandResponse and Energy Efficiency
This paper presents a preliminary framework to describe how advanced controls can support multiple modes of operations including both energy efficiency and demand response (DR). A general description of DR, its benefits, and nationwide status is outlined. The role of energy management and control systems for DR is described. Building systems such as HVAC and lighting that utilize control technologies and strategies for energy efficiency are mapped on to DR and demand shedding strategies are developed. Past research projects are presented to provide a context for the current projects. The economic case for implementing DR from a building owner perspective is also explored.
Date:
September 2, 2005
Creator:
Kiliccote, Sila & Piette, Mary Ann
Object Type:
Article
System:
The UNT Digital Library
Enhanced K(L) ---> Pi0 Nu Anti-Nu From Direct CP Violation in B ---> K Pi With Four Generations
Recent CP violation results in B decays suggest that Z penguins may have large weak phase. This can be realized by the four generation (standard) model. Concurrently, B {yields} X{sub s}{ell}{sup +}{ell}{sup -} and B{sub s} mixing allow for sizable V*{sub t's}V{sub t'b} only if it is nearly imaginary. Such large effects in b {leftrightarrow} s transitions would affect s {leftrightarrow} d transitions, as kaon constraints would demand V{sub t'd} {ne} 0. Using {Lambda}(Z {yields} b{bar b}) to bound |V{sub t'b}|, they infer sizable |V{sub t's}| {le} |V{sub t'b}| {le} |V{sub us}|. Imposing {var_epsilon}{sub K}, K{sup +} {yields} {pi}{sup +}{nu}{bar {nu}} and {var_epsilon}'/{var_epsilon} constraints, they find V*{sub t'd} V{sub t's} {approx} few x 10{sup -4} with large phase, enhancing K{sub L} {yields} {pi}{sup 0} {nu}{bar {nu}} to 5 x 10{sup -10} or even higher. Interestingly, {Delta}m{sub B{sub d}} and sin 2{Phi}{sub B{sub d}} are not much affected, as |V*{sub t'd} V{sub t'b} << |V*{sub td} V{sub tb}| {approx} 0.01.
Date:
September 2, 2005
Creator:
Hou, Wei-Shu; /Taiwan, Natl. Taiwan U. /SLAC; Nagashima, Makiko; /Taiwan, Natl. Taiwan U.; Soddu, Andrea & /Taiwan, Natl. Taiwan U. /Weizmann Inst.
Object Type:
Article
System:
The UNT Digital Library
Baryon Number Violation Involving Higher Generations
None
Date:
September 2, 2005
Creator:
Hou, Wei-Shu; /Taiwan, Natl. Taiwan U. /SLAC; Nagashima, Makiko; /Taiwan, Natl. Taiwan U.; Soddu, Andrea & /Taiwan, Natl. Taiwan U. /Weizmann Inst.
Object Type:
Article
System:
The UNT Digital Library
Regional Seismic Signals from Chemical Explosions, Nuclear Explosions and Earthquakes: Results from the Arizona Source Phenomenology Experiment
Routine industrial mining explosions play two important roles in seismic nuclear monitoring research: (1) they are a source of background events that need to be discriminated from potential nuclear explosions; (2) as some of the only explosions occurring in the current de facto global moratoria on nuclear testing, their signals should be exploited to improve the calibration of seismic m monitoring systems. A common issue monitoring arising in both of these roles is our limited physical understanding of the causes behind observed differences and similarities in the seismic signals produced by routine industrial mining blasts and small underground nuclear tests. In 2003 a consortium (Weston, SMU, LLNL, LANL and UTEP) carried out a Source Phenomenology Experiment (SPE), a series of dedicated explosions designed to improve this physical understanding, particularly as it relates to seismic methods of discriminating between signals from three different source types: earthquakes, industrial blasts, and nuclear tests. Here we very briefly review prior field experimental work that examined the seismic relationships between these source types.
Date:
September 2, 2005
Creator:
Walter, W R; Gok, R; Mayeda, K; Sicherman, A; Bonner, J & Leidig, M
Object Type:
Report
System:
The UNT Digital Library
2-D Reflectometer Modeling for Optimizing the ITER Low-field Side Reflectometer System
The response of a low-field side reflectometer system for ITER is simulated with a 2?D reflectometer code using a realistic plasma equilibrium. It is found that the reflected beam will often miss its launch point by as much as 40 cm and that a vertical array of receiving antennas is essential in order to observe a reflection on the low-field side of ITER.
Date:
September 2, 2005
Creator:
Kramer, G. J.; Nazikian, R.; Valeo, E. J.; Budny, R. V.; Kessel, C. & Johnson, D.
Object Type:
Report
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 107, No. 131, Ed. 1 Friday, September 2, 2005
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
September 2, 2005
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Oral History Interview with James Leach, September 2, 2005
The National Museum of the Pacific War presents an oral interview with James Leach. Leach joined the Navy in August, 1942 and after training attended diesel engine school in Missouri. After amphibious training at Little Creek, Virginia, Leach headed for Kentucky to join the crew of USS LST-78 in May 1943. In November, USS LST-78 was in on the invasion of Makin. Later, he made the landing at Kwajalein in early 1944. They spent a lot of time running supplies to Guam. In February, 1945, Leach returned to the US. When the war ended, Leach was in Farragut, Idaho having his teeth fixed.
Date:
September 2, 2005
Creator:
Leach, James
Object Type:
Text
System:
The Portal to Texas History
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 90, No. 305, Ed. 1 Friday, September 2, 2005
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
September 2, 2005
Creator:
Broaddus, Matthew B.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Rice Thresher, Vol. 93, No. 3, Ed. 1 Friday, September 2, 2005
A weekly student newspaper from the Rice University in Houston, Texas that includes campus news and commentaries along with advertising.
Date:
September 2, 2005
Creator:
Obermeyer, Amber
Object Type:
Newspaper
System:
The Portal to Texas History
The Greensheet (Dallas, Tex.), Vol. 29, No. 146, Ed. 1 Friday, September 2, 2005
Free weekly newspaper that includes business and classified advertising.
Date:
September 2, 2005
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Dallas, Tex.), Vol. 29, No. 147, Ed. 1 Friday, September 2, 2005
Free weekly newspaper that includes business and classified advertising.
Date:
September 2, 2005
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Dallas Voice (Dallas, Tex.), Vol. 22, No. 16, Ed. 1 Friday, September 2, 2005
Weekly newspaper from Dallas, Texas that includes local, state, and national news and advertising of interest to the Lesbian, Gay, Bisexual, and Transgender (LGBT) community.
Date:
September 2, 2005
Creator:
Vercher, Dennis
Object Type:
Newspaper
System:
The UNT Digital Library
The Optimist (Abilene, Tex.), Vol. 94, No. 5, Ed. 1, Friday, September 2, 2005
Weekly student newspaper from Abilene Christian University in Abilene, Texas that includes local, state and campus news along with advertising.
Date:
September 2, 2005
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Texas Register, Volume 30, Number 35, Pages 5099-5448, September 2, 2005
A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.
Date:
September 2, 2005
Creator:
Texas. Secretary of State.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
South Texas Catholic (Corpus Christi, Tex.), Vol. 40, No. 17, Ed. 1 Friday, September 2, 2005
Semi-monthly newspaper from Corpus Christi, Texas published by the Diocese of Corpus Christi that includes news of interest to Diocese members along with advertising.
Date:
September 2, 2005
Creator:
Goldapp, Paula J.
Object Type:
Newspaper
System:
The Portal to Texas History
The Oklahoma Daily (Norman, Okla.), Vol. 90, No. 13, Ed. 1 Friday, September 2, 2005
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
September 2, 2005
Creator:
Ganus, Sara
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
[Monthly report for Lone Star Ride Fighting AIDs]
Monthly report for the Lone Star Ride Fighting Aids.
Date:
September 2, 2005
Creator:
Lone Star Ride
Object Type:
Text
System:
The UNT Digital Library
The Grandview Tribune (Grandview, Tex.), Vol. 110, No. 51, Ed. 1 Friday, September 2, 2005
Weekly newspaper from Grandview, Texas that includes local, state, and national news along with advertising.
Date:
September 2, 2005
Creator:
Beck-Adams, Candie
Object Type:
Newspaper
System:
The Portal to Texas History
The Express-Star (Chickasha, Okla.), Ed. 1 Friday, September 2, 2005
Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
September 2, 2005
Creator:
Bush, Kent
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Harper News (Harper, Tex.), Vol. 2, No. 21, Ed. 1 Friday, September 2, 2005
Biweekly newspaper from Harper, Texas that includes community news along with advertising.
Date:
September 2, 2005
Creator:
Stevens, Martha
Object Type:
Newspaper
System:
The Portal to Texas History
The Sealy News (Sealy, Tex.), Vol. 118, No. 71, Ed. 1 Friday, September 2, 2005
Semiweekly newspaper from Sealy, Texas that includes local, state, and national news along with advertising.
Date:
September 2, 2005
Creator:
Griffin, Joanie & Ermis, Jay
Object Type:
Newspaper
System:
The Portal to Texas History
Public Diplomacy: A Review of Past Recommendations
None
Date:
September 2, 2005
Creator:
Epstein, Susan B. & Mages, Lisa
Object Type:
Report
System:
The UNT Digital Library