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Documenting Plate Waste in Middle School Cafeterias Using Digital Still Photography
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Detection of the Energetic Pulsar PSR B1509-58 And Its Pulsar Wind Nebula in MSH 15-52 Using the Fermi-Large Area Telescope
None
Date:
September 13, 2011
Creator:
Abdo, A. A.; Ackermann, M.; Ajello, M.; Allafort, A.; Asano, K.; Baldini, L. et al.
Object Type:
Article
System:
The UNT Digital Library
MULTIDENTATE TEREPHTHALAMIDATE AND HYDROXYPYRIDONATE LIGANDS: TOWARDS NEW ORALLY ACTIVE CHELATORS
The limitations of current therapies for the treatment of iron overload or radioisotope contamination have stimulated efforts to develop new orally bioavailable iron and actinide chelators. Siderophore-inspired tetradentate, hexadentate and octadentate terephthalamidate and hydroxypyridonate ligands were evaluated in vivo as selective and efficacious iron or actinide chelating agents, with several metal loading and ligand assessment procedures, using {sup 59}Fe, {sup 238}Pu, and {sup 241}Am as radioactive tracers. The compounds presented in this study were compared to commercially available therapeutic sequestering agents [deferoxamine (DFO) for iron and diethylenetriaminepentaacetic acid (DPTA) for actinides] and are unrivaled in terms of affinity, selectivity and decorporation efficacy, which attests to the fact that high metal affinity may overcome the low bioavailability properties commonly associated to multidenticity.
Date:
July 13, 2011
Creator:
Abergel, Rebecca J. & Raymond, Kenneth N.
Object Type:
Article
System:
The UNT Digital Library
[Abilene City Council Minutes: 2011]
Ledger containing minutes of the City Council in Abilene, Texas documenting the group's discussions and activities from January 13, 2011 to December 15, 2011.
Date:
2011-01-13/2011-12-15
Creator:
Abilene (Tex.)
Object Type:
Book
System:
The Portal to Texas History
Spectroscopic Analyses of the Biofuels-Critical Phytochemical Coniferyl Alcohol and Its Enzyme-Catalyzed Oxidation Products
Lignin composition (monolignol types of coniferyl, sinapyl or p-coumaryl alcohol) is causally related to biomass recalcitrance. We describe multiwavelength (220, 228, 240, 250, 260, 290, 295, 300, 310 or 320 nm) absorption spectroscopy of coniferyl alcohol and its laccase- or peroxidase-catalyzed products during real time kinetic, pseudo-kinetic and endpoint analyses, in optical turn on or turn off modes, under acidic or basic conditions. Reactions in microwell plates and 100 mu L volumes demonstrated assay miniaturization and high throughput screening capabilities. Bathochromic and hypsochromic shifts along with hyperchromicity or hypochromicity accompanied enzymatic oxidations by laccase or peroxidase. The limits of detection and quantitation of coniferyl alcohol averaged 2.4 and 7.1 mu M respectively, with linear trend lines over 3 to 4 orders of magnitude. Coniferyl alcohol oxidation was evident within 10 minutes or with 0.01 mu g/mL laccase and 2 minutes or 0.001 mu g/mL peroxidase. Detection limit improved to 1.0 mu M coniferyl alcohol with Km of 978.7 +/- 150.7 mu M when examined at 260 nm following 30 minutes oxidation with 1.0 mu g/mL laccase. Our assays utilized the intrinsic spectroscopic properties of coniferyl alcohol or its oxidation products for enabling detection, without requiring chemical synthesis or modification of …
Date:
July 13, 2011
Creator:
Achyuthan, Komandoor; Adams, Paul; Simmons, Blake & Singh, Anup
Object Type:
Article
System:
The UNT Digital Library
Status of Plasma Electron Hose Instability Studies in FACET
In the FACET plasma-wakefield acceleration experiment a dense 23 GeV electron beam will interact with lithium and cesium plasmas, leading to plasma ion-channel formation. The interaction between the electron beam and the plasma sheath-electrons may lead to a fast growing electron hose instability. By using optics dispersion knobs to induce a controlled z-x tilt along the beam entering the plasma, we investigate the transverse behavior of the beam in the plasma as function of the tilt. We seek to quantify limits on the instability in order to further explore potential limitations on future plasma wakefield accelerators due to the electron hose instability. The FACET plasma-wakefield experiment at SLAC will study beam driven plasma wakefield acceleration. A dense 23 GeV electron beam will interact with lithium or cesium plasma, leading to plasma ion-channel formation. The interaction between the electron beam and the plasma sheath-electrons drives the electron hose instability, as first studied by Whittum. While Ref. [2] indicates the possibility of a large instability growth rate for typical beam and plasma parameters, other studies including have shown that several physical effects may mitigate the hosing growth rate substantially. So far there has been no quantitative benchmarking of experimentally observed hosing in …
Date:
December 13, 2011
Creator:
Adli, Erik; England, Robert Joel; Frederico, Joel; Hogan, Mark; Li, Selina Zhao; Litos, Michael Dennis et al.
Object Type:
Article
System:
The UNT Digital Library
Beam Dynamics Study of X-Band Linac Driven X-Ray FELS
Several linac driven X-ray Free Electron Lasers (XFELs) are being developed to provide high brightness photon beams with very short, tunable wavelengths. In this paper, three XFEL configurations are proposed that achieve LCLS-like performance using X-band linac drivers. These linacs are more versatile, efficient and compact than ones using S-band or C-band rf technology. For each of the designs, the overall accelerator layout and the shaping of the bunch longitudinal phase space are described briefly. During the last 40 years, the photon wavelengths from linac driven FELs have been pushed shorter by increasing the electron beam energy and adopting shorter period undulators. Recently, the wavelengths have reached the X-ray range, with FLASH (Free-Electron Laser in Hamburg) and LCLS (Linac Coherent Light Source) successfully providing users with soft and hard X-rays, respectively. FLASH uses a 1.2 GeV L-band (1.3 GHz) superconducting linac driver and can deliver 10-70 fs FWHM long photon pulses in a wavelength range of 44 nm to 4.1 nm. LCLS uses the last third of the SLAC 3 km S-band (2.856 GHz) normal-conducting linac to produce 3.5 GeV to 15 GeV bunches to generate soft and hard X-rays with good spatial coherence at wavelengths from 2.2 nm to …
Date:
December 13, 2011
Creator:
Adolphsen, C.; Limborg-Deprey, C.; Raubenheimer, T. O.; Wu, J. & Sun, Y.
Object Type:
Article
System:
The UNT Digital Library
The Gray Wolf and the Endangered Species Act: A Brief Legal History
This report provides a brief history of the laws, regulations, and lawsuits related to the wolf's protected status.
Date:
April 13, 2011
Creator:
Alexander, Kristina
Object Type:
Report
System:
The UNT Digital Library
Alvarado Star (Alvarado, Tex.), Vol. 14, No. 27, Ed. 1 Thursday, January 13, 2011
Weekly newspaper from Alvarado, Texas that includes local, state, and national news along with advertising.
Date:
January 13, 2011
Creator:
Amos, Christopher
Object Type:
Newspaper
System:
The Portal to Texas History
Algeria: Current Issues
This report examines the current state of Algeria, including the country's associations with terrorism, despite steady decreases of domestic terrorism; the lessening in power of the Algerian military; and growing oil revenues.
Date:
April 13, 2011
Creator:
Arieff, Alexis
Object Type:
Report
System:
The UNT Digital Library
HEAVY WATER COMPONENTS TEST REACTOR DECOMMISSIONING
The Heavy Water Components Test Reactor (HWCTR) Decommissioning Project was initiated in 2009 as a Comprehensive Environmental Response, Compensation and Liability Act (CERCLA) Removal Action with funding from the American Recovery and Reinvestment Act (ARRA). This paper summarizes the history prior to 2009, the major D&D activities, and final end state of the facility at completion of decommissioning in June 2011. The HWCTR facility was built in 1961, operated from 1962 to 1964, and is located in the northwest quadrant of the Savannah River Site (SRS) approximately three miles from the site boundary. The HWCTR was a pressurized heavy water test reactor used to develop candidate fuel designs for heavy water power reactors. In December of 1964, operations were terminated and the facility was placed in a standby condition as a result of the decision by the U.S. Atomic Energy Commission to redirect research and development work on heavy water power reactors to reactors cooled with organic materials. For about one year, site personnel maintained the facility in a standby status, and then retired the reactor in place. In the early 1990s, DOE began planning to decommission HWCTR. Yet, in the face of new budget constraints, DOE deferred dismantlement and …
Date:
October 13, 2011
Creator:
Austin, W. & Brinkley, D.
Object Type:
Article
System:
The UNT Digital Library
Argonne's Laboratory Computing Resource Center 2009 Annual Report.
Now in its seventh year of operation, the Laboratory Computing Resource Center (LCRC) continues to be an integral component of science and engineering research at Argonne, supporting a diverse portfolio of projects for the U.S. Department of Energy and other sponsors. The LCRC's ongoing mission is to enable and promote computational science and engineering across the Laboratory, primarily by operating computing facilities and supporting high-performance computing application use and development. This report describes scientific activities carried out with LCRC resources in 2009 and the broad impact on programs across the Laboratory. The LCRC computing facility, Jazz, is available to the entire Laboratory community. In addition, the LCRC staff provides training in high-performance computing and guidance on application usage, code porting, and algorithm development. All Argonne personnel and collaborators are encouraged to take advantage of this computing resource and to provide input into the vision and plans for computing and computational analysis at Argonne. The LCRC Allocations Committee makes decisions on individual project allocations for Jazz. Committee members are appointed by the Associate Laboratory Directors and span a range of computational disciplines. The 350-node LCRC cluster, Jazz, began production service in April 2003 and has been a research work horse ever …
Date:
May 13, 2011
Creator:
Bair, R. B. (CLS-CI)
Object Type:
Report
System:
The UNT Digital Library
Faculty Recital: 2011-10-13 - Tony Baker, trombone and Nataliya Sukhina, piano
Access:
Use of this item is restricted to the UNT Community
Concert presented at the UNT College of Music Voertman Hall.
Date:
October 13, 2011
Creator:
Baker, Tony (Trombonist) & Sukhina, Nataliya
Object Type:
Sound
System:
The UNT Digital Library
Computational Modeling of Uranium and Plutonium Hydriding- the role of Surface Oxide Layers, Oxycarbides, Carbides & Impurities
None
Date:
September 13, 2011
Creator:
Balasubramanian, K; Siekhaus, W & McLean, W
Object Type:
Article
System:
The UNT Digital Library
Assessment of Unabated Facility Emission Potentials for Evaluating Airborne Radionuclide Monitoring Requirements at Pacific Northwest National Laboratory - 2010
Assessments were performed to evaluate compliance with the airborne radionuclide emission monitoring requirements in the National Emission Standards for Hazardous Air Pollutants ([NESHAP]; U.S. Code of Federal Regulations, Title 40, Part 61, Subpart H) and Washington Administrative Code 246-247: Radiation Protection - Air Emissions. In these NESHAP assessments, potential unabated off-site doses were evaluated for emission locations at buildings that are part of the consolidated laboratory campus of the Pacific Northwest National Laboratory. This report describes the inventory-based methods and provides the results for the NESHAP assessment performed in 2010.
Date:
May 13, 2011
Creator:
Ballinger, Marcel Y.; Gervais, Todd L. & Barnett, J. M.
Object Type:
Report
System:
The UNT Digital Library
Lattice Design for PEP-X Ultimate Storage Ring Light Source
SLAC expertise in designing and operating high current storage rings and the availability of the 2.2-km PEP-II tunnel present an opportunity for building a next generation light source - PEP-X - that would replace the SPEAR3 storage ring in the future. The PEP-X 'baseline' design, with 164 pm-rad emittance at 4.5 GeV beam energy and a current of 1.5 A, was completed in 2010. As a next step, a so-called 'ultimate' PEP-X lattice, reducing the emittance to 11 pm-rad at zero current, has been designed. This emittance approaches the diffraction limited photon emittance for multi-keV photons, providing near maximum photon brightness and high coherence. It is achieved by using 7-bend achromat cells in the ring arcs and a 90-m damping wiggler in one of the 6 long straight sections. Details of the lattice design, dynamic aperture, and calculations of the intra-beam scattering effect and Touschek lifetime at a nominal 0.2 A current are presented. Accelerator-based light sources are in high demand for many experimental applications. The availability of the 2.2-km PEP-II tunnel at SLAC presents an opportunity for building a next generation light source - PEP-X - that would replace the existing SPEAR3 light source in the future. The PEP-X …
Date:
December 13, 2011
Creator:
Bane, K. L. F.; Cai, Y.; Nosochkov, Y.; Wang, M. -H. & Hettel, R. O.
Object Type:
Article
System:
The UNT Digital Library
Upwind schemes for the wave equation in second order form
None
Date:
December 13, 2011
Creator:
Banks, J W & Henshaw, W D
Object Type:
Article
System:
The UNT Digital Library
Limiting Future Proliferation and Security Risks
A major new technical tool for evaluation of proliferation and security risks has emerged over the past decade as part the activities of the Generation IV International Forum. The tool has been developed by a consensus group from participating countries and organizations and is termed the Proliferation Resistance and Physical Protection (PR&PP) Evaluation Methodology. The methodology defines a set of challenges, analyzes system response to these challenges, and assesses outcomes. The challenges are the threats posed by potential actors (proliferant states or sub-national adversaries). It is of paramount importance in an evaluation to establish the objectives, capabilities, resources, and strategies of the adversary as well as the design and protection contexts. Technical and institutional characteristics are both used to evaluate the response of the system and to determine its resistance against proliferation threats and robustness against sabotage and terrorism threats. The outcomes of the system response are expressed in terms of a set of measures, which thereby define the PR&PP characteristics of the system. This paper summarizes results of applications of the methodology to nuclear energy systems including reprocessing facilities and large and small modular reactors. The use of the methodology in the design phase a facility will be discussed …
Date:
March 13, 2011
Creator:
Bari, R.
Object Type:
Article
System:
The UNT Digital Library
Study of Risk Assessment Programs at Federal Agencies and Commercial Industry Related to the Conduct or Regulation of High Hazard Operations
In the Department of Energy (DOE) Implementation Plan (IP) for Defense Nuclear Facilities Safety Board's Recommendation 2009-1, the DOE committed to studying the use of quantitative risk assessment methodologies at government agencies and industry. This study consisted of document reviews and interviews of senior management and risk assessment staff at six organizations. Data were collected and analyzed on risk assessment applications, risk assessment tools, and controls and infrastructure supporting the correct usage of risk assessment and risk management tools. The study found that the agencies were in different degrees of maturity in the use of risk assessment to support the analysis of high hazard operations and to support decisions related to these operations. Agencies did not share a simple, 'one size fits all' approach to tools, controls, and infrastructure needs. The agencies recognized that flexibility was warranted to allow use of risk assessment tools in a manner that is commensurate with the complexity of the application. The study also found that, even with the lack of some data, agencies application of the risk analysis structured approach could provide useful insights such as potential system vulnerabilities. This study, in combination with a companion study of risk assessment programs in the DOE …
Date:
March 13, 2011
Creator:
Bari, R.; Rosenbloom, S. & O'Brien, J.
Object Type:
Article
System:
The UNT Digital Library
Electron Bunch Profile Diagnostics in the Few FS Regime Using Coherent Smith-Purcell Radiation
The rapid developments in the field of laser-driven particle acceleration hold the prospect of intense, highly relativistic electron bunches that are only a few fs long. The determination of the temporal profile of such bunches presents new challenges. The use of a radiative process such as Smith-Purcell radiation (SPR), is particularly promising in this respect. In this technique the beam is made to radiate a small amount of e/m radiation and the temporal profile is reconstructed from the measured spectral distribution of the radiation. We summarise the advantages of SPR and present the design parameters and preliminary results of the experiments at the FACET facility at SLAC. We also discuss a new approach to the problem of the recovery of the 'missing phase', which is essential for the accurate reconstruction of the temporal bunch profile.
Date:
December 13, 2011
Creator:
Bartolini, R.; Source, /Oxford U. /Diamond Light; Clarke, C.; /SLAC; Delerue, N.; /Orsay, LAL et al.
Object Type:
Article
System:
The UNT Digital Library
Holocaust-Era Insurance Claims: Background and Proposed Legislation
This report aims to inform consideration of H.R. 890 and S. 466 and possible alternatives by providing: background on Holocaust-era compensation and restitution issues; an overview of the International Commission on Holocaust Era Insurance Claims (ICHEIC), including criticism and support of its claims process and Administration policy on ICHEIC; and an overview of litigation on Holocaust-era insurance claims and the proposed legislation.
Date:
July 13, 2011
Creator:
Belkin, Paul; Ruane, Kathleen Ann & Webel, Baird
Object Type:
Report
System:
The UNT Digital Library
Intelligence Issues for Congress
To address the challenges facing the U.S. intelligence community in the 21st century, congressional and executive branch initiatives have sought to improve coordination among the different agencies and to encourage better analysis. This report discusses these challenges and efforts the current and previous Administrations and Congresses have taken and are taking to address them. The report includes criticism of the intelligence community's efforts regarding Iraq, Iran, and other areas. Improved analysis remains a key goal in these discussions.
Date:
April 13, 2011
Creator:
Best, Richard A., Jr.
Object Type:
Report
System:
The UNT Digital Library
Satellite Surveillance: Domestic Issues
Report that provides background on the development of intelligence satellites and identifies the roles various agencies play in their management and use. Issues surrounding the current policy and proposed changes are discussed, followed by a discussion of legal considerations.
Date:
January 13, 2011
Creator:
Best, Richard A., Jr. & Elsea, Jennifer K.
Object Type:
Report
System:
The UNT Digital Library
Observations and Modeling of Long Negative Laboratory Discharges: Identifying the Physics Important to an Electrical Spark in Air
There are relatively few reports in the literature focusing on negative laboratory leaders. Most of the reports focus exclusively on the simpler positive laboratory leader that is more commonly encountered in high voltage engineering [Gorin et al., 1976; Les Renardieres Group, 1977; Gallimberti, 1979; Domens et al., 1994; Bazelyan and Raizer 1998]. The physics of the long, negative leader and its positive counterpart are similar; the two differ primarily in their extension mechanisms [Bazelyan and Raizer, 1998]. Long negative sparks extend primarily by an intermittent process termed a 'step' that requires the development of secondary leader channels separated in space from the primary leader channel. Long positive sparks typically extend continuously, although, under proper conditions, their extension can be temporarily halted and begun again, and this is sometimes viewed as a stepping process. However, it is emphasized that the nature of positive leader stepping is not like that of negative leader stepping. There are several key observational studies of the propagation of long, negative-polarity laboratory sparks in air that have aided in the understanding of the stepping mechanisms exhibited by such sparks [e.g., Gorin et al., 1976; Les Renardieres Group, 1981; Ortega et al., 1994; Reess et al., 1995; Bazelyan …
Date:
December 13, 2011
Creator:
Biagi, C J & Uman, M A
Object Type:
Report
System:
The UNT Digital Library
[Beta Theta Pi alumni at John Hurst reception]
Photograph of former members of the Beta Theta Pi fraternity at a reception celebrating the naming of the Captain John Clark Hurst Naval Commanding Officer's room in the College of Liberal Arts at the University of Texas, Austin. They are positioned in four rows, facing the camera and smiling. Members of the group have been identified as: (back standing l-r) Mike Simpson, Jim Dyer, George Harcourt, Makkie Hruska, Mike Townsend, Jim Nicholson, Mike Zeeck, Carroll Sunseri, Charles Hickox, Mike Harris, Pat McLean, John LeFlore, John Shawe; (standing l-r) Bill Kirkgard, Joe Rust, Covey Nash, Will Jordan, Tom Cook, Bill Hanover, Jim McDugald, Gordon Muir, Jim Grevelle, Sam Dibrell, Ed Price, Alan Nalle, Gerald Simpson, Phil Thrash, John Treadwell, Woody Scott; (sitting l-r) George Brown, Larry Littleton, Ralph Peterson, Blair Cherry, Ross Vick, Brian O'Connor, Sam Evans, Larry Jordan, Nick Sikes, Gregg Young; (kneeling l-r) Mike Pearson, Sid Jarnagin, Ray Polk, Ed Tatum, and Mike English.
Date:
October 13, 2011
Creator:
Birzer, Brian
Object Type:
Photograph
System:
The UNT Digital Library