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Diffusion Simulation and Lifetime Calculation at RHIC
The beam lifetime is an important parameter for any storage ring. For protons in RHIC it is dominated by the non-linear nature of the head-on collisions that causes the particles to diffuse outside the stable area in phase space. In this report we show results from diffusion simulation and lifetime calculation for the 2006 and 2008 polarized proton runs in RHIC.
Date:
January 2, 2009
Creator:
Abreu,N.P.; Fischer, W.; Luo, Y. & Robert-Demolaize, G.
Object Type:
Report
System:
The UNT Digital Library
Lebanon: Background and U.S. Relations
This report provides an overview of Lebanese politics, recent events in Lebanon, and current issues in U.S.-Lebanon relations and will be updated to reflect major developments.
Date:
November 2, 2009
Creator:
Addis, Casey L.
Object Type:
Report
System:
The UNT Digital Library
Timpson & Tenaha News (Timpson, Tex.), Vol. 27, No. 13, Ed. 1 Thursday, April 2, 2009
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
April 2, 2009
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Timpson & Tenaha News (Timpson, Tex.), Vol. 28, No. 26, Ed. 1 Thursday, July 2, 2009
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
July 2, 2009
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Age estimation in forensic sciences: Application of combined aspartic acid racemization and radiocarbon analysis
Age determination of unknown human bodies is important in the setting of a crime investigation or a mass disaster, since the age at death, birth date and year of death, as well as gender, can guide investigators to the correct identity among a large number of possible matches. Traditional morphological methods used by anthropologists to determine age are often imprecise, whereas chemical analysis of tooth dentin, such as aspartic acid racemization has shown reproducible and more precise results. In this paper we analyze teeth from Swedish individuals using both aspartic acid racemization and radiocarbon methodologies. The rationale behind using radiocarbon analysis is that above-ground testing of nuclear weapons during the cold war (1955-1963) caused an extreme increase in global levels of carbon-14 ({sup 14}C) which have been carefully recorded over time. Forty-four teeth from 41 individuals were analyzed using aspartic acid racemization analysis of tooth crown dentin or radiocarbon analysis of enamel and ten of these were split and subjected to both radiocarbon and racemization analysis. Combined analysis showed that the two methods correlated well (R2=0.66, p < 0.05). Radiocarbon analysis showed an excellent precision with an overall absolute error of 0.6 {+-} 04 years. Aspartic acid racemization also showed …
Date:
November 2, 2009
Creator:
Alkass, K.; Buchholz, B. A.; Ohtani, S.; Yamamoto, T.; Druid, H. & Spalding, S. L.
Object Type:
Article
System:
The UNT Digital Library
2008 B20 Survey Results
Describes results of a sample survey of the quality of B20, a biodiesel blend, collected from U.S. public pumps and fleets as part of a joint effort by NREL, the NBB, and engine manufacturers.
Date:
February 2, 2009
Creator:
Alleman, T. L. & McCormick, R. L.
Object Type:
Presentation
System:
The UNT Digital Library
MOSAIC: a new wavefront metrology
MOSAIC is a new wavefront metrology that enables complete wavefront characterization from print or aerial image based measurements. Here we describe MOSAIC and verify its utility with a model-based proof of principle.
Date:
February 2, 2009
Creator:
Anderson, Christopher & Naulleau, Patrick
Object Type:
Article
System:
The UNT Digital Library
The Oklahoma Daily (Norman, Okla.), Vol. 94, No. 153, Ed. 1 Tuesday, June 2, 2009
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
June 2, 2009
Creator:
Atkinson, Luke
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Oklahoma Daily (Norman, Okla.), Vol. 94, No. 164, Ed. 1 Thursday, July 2, 2009
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
July 2, 2009
Creator:
Atkinson, Luke
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Measurement of the gamma gamma* -> pi0 transition form factor
We study the reaction e{sup +}e{sup -} {yields} e{sup +}e{sup -}{pi}{sup 0} in the single tag mode and measure the differential cross section d{sigma}/dQ{sup 2} and the {gamma}{gamma}* {yields} {pi}{sup 0} transition form factor in the mometum transfer range from 4 to 40 GeV{sup 2}. At Q{sup 2} > 10 GeV{sup 2} the measured form factor exceeds the asymptotic limit predicted by perturbative QCD. The analysis is based on 442 fb{sup -1} of integrated luminosity collected at PEP-II with the BABAR detector at e{sup +}e{sup -} center-of-mass energies near 10.6 GeV.
Date:
June 2, 2009
Creator:
Aubert, B.
Object Type:
Article
System:
The UNT Digital Library
Search for Dimuon Decays of a Light Scalar Boson in Radiative Transitions Y -> gamma A^0
We search for evidence of a light scalar boson in the radiative decays of the {Upsilon}(2S) and {Upsilon}(3S) resonances: {Upsilon}(2S, 3S) {yields} {gamma}A{sup 0}, A{sup 0} {yields} {mu}{sup +}{mu}{sup -}. Such a particle appears in extensions of the Standaard Model, where a light CP-odd Higgs boson naturally couples strongly to b-quarks. We find no evidence for such processes in the mass range 0.212 {<=} m{sub A{sup 0}} {<=} 9.3 GeV in the samples of 99 x 10{sup 6} {Upsilon}(2S) and 122 x 10{sup 6} {Upsilon}(3S) decays collected by the BABAR detector at the PEP-II B-factory and set stringent upper limits on the effective coupling of the b quark to the A{sup 0}. We also limit the dimuon branching fraction of the {eta}{sub b} meson: {Beta}({eta}{sub b} {yields} {mu}{sup +}{mu}{sup -}) < 0.9% at 90% confidence level.
Date:
June 2, 2009
Creator:
Aubert, B.
Object Type:
Article
System:
The UNT Digital Library
Search for Dimuon Decays of a Light Scalar in Radiative Transitions Y(3S) -> gamma A0
The fundamental nature of mass is one of the greatest mysteries in physics. The Higgs mechanism is a theoretically appealing way to account for the different masses of elementary particles and implies the existence of a new, yet unseen particle, the Higgs boson. We search for evidence of a light scalar (e.g. a Higgs boson) in the radiative decays of the narrow {Upsilon}(3S) resonance: {Upsilon}(3S) {yields} {gamma}A{sup 0}, A{sup 0} {yields} {mu}{sup +}{mu}{sup -}. Such an object appears in extensions of the Standard Model, where a light CP-odd Higgs boson naturally couples strongly to b-quarks. We find no evidence for such processes in a sample of 122 x 10{sup 6} {Upsilon}(3S) decays collected by the BABAR collaboration at the PEP-II B-factory, and set 90% C.L. upper limits on the branching fraction product {Beta}({Upsilon}(3S) {yields} {gamma}A{sup 0}) x {Beta}(A{sup 0} {yields} {mu}{sup +}{mu}{sup -}) at (0.25 - 5.2) x 10{sup -6} in the mass range 0.212 {<=} m{sub A{sup 0}} {<=} 9.3 GeV. We also set a limit on the dimuon branching fraction of the {eta}{sub b} meson {Beta}({eta}{sub b} {yields} {mu}{sup +}{mu}{sup -}) < 0.8% at 90% C.L. The results are preliminary.
Date:
June 2, 2009
Creator:
Aubert, B.
Object Type:
Article
System:
The UNT Digital Library
FIRST STEPS INTO AN ENERGY EFFECIENT FUTURE
Red Lake Band of Chippewa Indians proposes to develop a more sustainable, affordable and autonomous energy future for Tribal Members. The Band will develop the capacity to conduct energy audits, to implement energy efficiency measures in tribal homes, and to build more energy efficient housing. This will be done by providing direct classroom and on the job training for Tribal members to conduct the energy audits and the installation of insulation.
Date:
April 2, 2009
Creator:
BARRETT, JANE L.
Object Type:
Report
System:
The UNT Digital Library
Effect of Te Inclusions on Internal Electric Field of CdMnTe Gamma-Ray Detectors
We studied two separate as-grown CdMnTe crystals by Infrared (IR) microscopy and Pockels effect imaging, and then developed an algorithm to analyze and visualize the electric field within the crystals’ bulk. In one of the two crystals the size and distribution of inclusions within the bulk promised to be more favorable in terms of efficiency as a detector crystal. However, the Te inclusions were arranged in characteristic ‘planes’. Pockels imaging revealed an accumulation of charges in the region of these planes. We demonstrated that the planes induced stress within the bulk of the crystal that accumulated charges, thereby causing non-uniformity of the internal electric field and degrading the detector’s performance.
Date:
August 2, 2009
Creator:
Babalola, O.S.; Bolotnikov, A.; Egarievwe, S.; Hossain, A.; Burger, A. & James, R.
Object Type:
Article
System:
The UNT Digital Library
Taking Apple to the People: A Successful Retail Strategy for the Store Doomed to Fail
Presentation for the 2009 University Scholars Day at the University of North Texas discussing the Apple company and the success of their retail stores.
Date:
April 2, 2009
Creator:
Baczewski, Cody & Rice, Murray D.
Object Type:
Presentation
System:
The UNT Digital Library
Measurement of Black Carbon and Particle Number Emission Factors from Individual Heavy-Duty Trucks
Emission factors for black carbon (BC) and particle number (PN) were measured from 226 individual heavy-duty (HD) diesel-fueled trucks driving through a 1 km-long California highway tunnel in August 2006. Emission factors were based on concurrent increases in BC, PN, and CO{sub 2}B concentrations (measured at 1 Hz) that corresponded to the passage of individual HD trucks. The distributions of BC and PN emission factors from individual HD trucks are skewed, meaning that a large fraction of pollution comes from a small fraction of the in-use vehicle fleet. The highest-emitting 10% of trucks were responsible for {approx} 40% of total BC and PN emissions from all HD trucks. BC emissions were log-normally distributed with a mean emission factor of 1.7 g kg {sup -1} and maximum values of {approx} 10 g kg{sup -1}. Corresponding values for PN emission factors were 4.7 x 10{sup 15} and 4 x 10{sup 16} kg{sup -1}. There was minimal overlap among high-emitters of these two pollutants: only 1 of the 226 HD trucks measured was found to be among the highest 10% for both BC and PN. Monte Carlo resampling of the distribution of BC emission factors observed in this study revealed that uncertainties (1{sigma}) …
Date:
February 2, 2009
Creator:
Ban-Weiss, George A.; Lunden, Melissa M.; Kirchstetter, Thomas W. & Harley, Robert A.
Object Type:
Article
System:
The UNT Digital Library
Estuarine Habitats for Juvenile Salmon in the Tidally-Influenced Lower Columbia River and Estuary : Reporting Period September 15, 2008 through May 31, 2009.
This work focuses on the numerical modeling of Columbia River estuarine circulation and associated modeling-supported analyses conducted as an integral part of a multi-disciplinary and multi-institutional effort led by NOAA's Northwest Fisheries Science Center. The overall effort is aimed at: (1) retrospective analyses to reconstruct historic bathymetric features and assess effects of climate and river flow on the extent and distribution of shallow water, wetland and tidal-floodplain habitats; (2) computer simulations using a 3-dimensional numerical model to evaluate the sensitivity of salmon rearing opportunities to various historical modifications affecting the estuary (including channel changes, flow regulation, and diking of tidal wetlands and floodplains); (3) observational studies of present and historic food web sources supporting selected life histories of juvenile salmon as determined by stable isotope, microchemistry, and parasitology techniques; and (4) experimental studies in Grays River in collaboration with Columbia River Estuary Study Taskforce (CREST) and the Columbia Land Trust (CLT) to assess effects of multiple tidal wetland restoration projects on various life histories of juvenile salmon and to compare responses to observed habitat-use patterns in the mainstem estuary. From the above observations, experiments, and additional modeling simulations, the effort will also (5) examine effects of alternative flow-management and habitat-restoration …
Date:
August 2, 2009
Creator:
Baptista, António M.
Object Type:
Report
System:
The UNT Digital Library
Government Access to Phone Calling Activity and Related Records: Legal Authorities
This report summarizes legal authorities regarding access by the government, for either foreign intelligence or law enforcement purposes, to information related to telephone calling patterns or practices. Where pertinent, it also discusses statutory prohibitions against accessing or disclosing such information, along with relevant exceptions to those prohibitions.
Date:
February 2, 2009
Creator:
Bazan, Elizabeth B.; Liu, Edward C. & Stevens, Gina
Object Type:
Report
System:
The UNT Digital Library
South Texas Catholic (Corpus Christi, Tex.), Vol. 44, No. 19, Ed. 1 Friday, October 2, 2009
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:
October 2, 2009
Creator:
Beaton, Paula J.
Object Type:
Newspaper
System:
The Portal to Texas History
U.S. Food and Agricultural Imports: Safeguards and Selected Issues
The issue was explored at numerous congressional hearings in 2007 and 2008, and Members of Congress introduced a variety of bills to modify or overhaul the current system. Some sought broad reforms in the U.S. Food and Drug Administration's (FDA's) oversight of both food and drug safety, including of imports.
Date:
February 2, 2009
Creator:
Becker, Geoffrey S.
Object Type:
Report
System:
The UNT Digital Library
Troop Levels in the Afghan and Iraq Wars, FY2001-FY2012: Cost and Other Potential Issues
In February and March 2009, the Obama Administration announced its overall plans to increase troop levels in Afghanistan and decrease troop levels in Iraq for 2009 through 2011. Using several Department of Defense (DOD) data reports, this report describes, analyzes, and estimates deployed troop strength from the 9/11 attacks to FY2012 to provide Congress with a tool to assess current and future DOD war funding requests; implications for the U.S. military presence in the region; and deployment burdens on individual service members and each of the services.
Date:
July 2, 2009
Creator:
Belasco, Amy
Object Type:
Report
System:
The UNT Digital Library
Superconducting Storage Cavity for RHIC
This document provides a top-level description of a superconducting cavity designed to store hadron beams in the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory. It refers to more detailed documents covering the various issues in designing, constructing and operating this cavity. The superconducting storage cavity is designed to operate at a harmonic of the bunch frequency of RHIC at a relatively low frequency of 56 MHz. The current storage cavities of RHIC operate at 197 MHz and are normal-conducting. The use of a superconducting cavity allows for a high gap voltage, over 2 MV. The combination of a high voltage and low frequency provides various advantages stemming from the resulting large longitudinal acceptance bucket.
Date:
January 2, 2009
Creator:
Ben-Zvi, Ilan
Object Type:
Report
System:
The UNT Digital Library
The Impact of Indigenous Movements in Latin America: A Work in Progress
Presentation for the 2009 University Scholars Day at the University of North Texas discussing research on the impact of indigenous movements in Latin America.
Date:
April 2, 2009
Creator:
Bensen, Clara & Sahliyeh, Emile F.
Object Type:
Presentation
System:
The UNT Digital Library
The importance of cytosolic glutamine synthetase in nitrogen assimilation and recycling
Glutamine synthetase assimilates ammonium into amino acids, thus it is a key enzyme for nitrogen metabolism. The cytosolic isoenzymes of glutamine synthetase assimilate ammonium derived from primary nitrogen uptake and from various internal nitrogen recycling pathways. In this way, cytosolic glutamine synthetase is crucial for the remobilization of protein-derived nitrogen. Cytosolic glutamine synthetase is encoded by a small family of genes that are well conserved across plant species. Members of the cytosolic glutamine synthetase gene family are regulated in response to plant nitrogen status, as well as to environmental cues, such as nitrogen availability and biotic/abiotic stresses. The complex regulation of cytosolic glutamine synthetase at the transcriptional to post-translational levels is key to the establishment of a specific physiological role for each isoenzyme. The diverse physiological roles of cytosolic glutamine synthetase isoenzymes are important in relation to current agricultural and ecological issues.
Date:
July 2, 2009
Creator:
Bernard, S. M. & Habash, D. Z.
Object Type:
Article
System:
The UNT Digital Library