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Faculty Recital: 2007-02-23 - Lynn Eustis, soprano and Kevin Jones, piano
Access:
Use of this item is restricted to the UNT Community
A faculty and guest recital performed at the UNT College of Music Recital Hall.
Date:
February 23, 2007
Creator:
Eustis, Lynn & Jones, Kevin
Object Type:
Sound
System:
The UNT Digital Library
Faculty Recital: 2007-02-27 - William Scharnberg, horn and Bret Serrin, piano and James Gillespie, clarinet
Access:
Use of this item is restricted to the UNT Community
A faculty recital performed at the UNT College of Music Recital Hall.
Date:
February 27, 2007
Creator:
Scharnberg, William; Serrin, Bret & Gillespie, James
Object Type:
Sound
System:
The UNT Digital Library
Faculty Recital: 2007-02-20 - Elizabeth McNutt, flute and Christopher Deane, percussion
Access:
Use of this item is restricted to the UNT Community
A faculty and guest artist recital performed at the UNT College of Music Recital Hall.
Date:
February 20, 2007
Creator:
McNutt, Elizabeth & Deane, Christopher
Object Type:
Sound
System:
The UNT Digital Library
Business Systems Modernization: Internal Revenue Service's Fiscal Year 2007 Expenditure Plan
A letter report issued by the Government Accountability Office with an abstract that begins "The Internal Revenue Service's (IRS) Business Systems Modernization (BSM) program is a multibillion-dollar, high-risk, highly complex effort that involves the development and delivery of a number of modernized information systems that are intended to replace the agency's aging business and tax processing systems. As required by law, IRS submitted its fiscal year 2007 expenditure plan, in September 2006, to congressional appropriations committees, requesting $167.3 million from the BSM account. GAO's objectives in reviewing the plan were to (1) determine whether it satisfied the conditions specified in the law, (2) determine IRS's progress in implementing prior GAO recommendations, and (3) provide any other observations about the plan and IRS's BSM program. To address these objectives, GAO analyzed the plan, reviewed related documentation, and interviewed IRS officials."
Date:
February 15, 2007
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
Taxpayer Advocate Service: Caseload Has Grown and Taxpayers Report Being Satisfied, but Additional Measures of Efficiency and Effectiveness Are Needed
A letter report issued by the Government Accountability Office with an abstract that begins "Congress created the Taxpayer Advocate Service (TAS) to assist taxpayers in resolving problems with the Internal Revenue Service (IRS) and to propose changes to IRS's practices to mitigate problems affecting taxpayers in general. TAS uses case advocacy and systemic advocacy, respectively, to address these two goals. GAO was asked to address (1) why TAS's caseload has increased since 2004, (2) how well TAS conducted its case advocacy activities in terms of measures such as customer satisfaction and quality, and (3) how well TAS measures and reports its systemic advocacy efforts. GAO interviewed TAS and IRS managers and other staff, reviewed TAS and IRS documents, and analyzed TAS and IRS data."
Date:
February 22, 2007
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
Secure Border Initiative: SBInet Expenditure Plan Needs to Better Support Oversight and Accountability
A letter report issued by the Government Accountability Office with an abstract that begins "In November 2005, the Department of Homeland Security (DHS) established the Secure Border Initiative (SBI) program to secure U.S. borders and reduce illegal immigration. One element of SBI is SBInet, the program responsible for developing a comprehensive border protection system. By legislative mandate, DHS developed a fiscal year 2007 expenditure plan for SBInet to address nine legislative conditions, including a review by GAO. DHS submitted the plan to the Appropriations Committees on December 4, 2006. To address the mandate, GAO assessed the plan against federal guidelines and industry standards and interviewed appropriate DHS officials."
Date:
February 15, 2007
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
Supporting Information: Thermochemical studies on 3-methylquinoxaline-2-carboxamide 1,4-dioxide derivatives: enthalpies of formation and of (N-O) bond dissociation
This document includes supplemental material to an article titled "Thermochemical studies on 3-methylquinoxaline-2-carboxamide 1,4-dioxide derivatives: enthalpies of formation and of (N-O) bond dissociation," published in the Journal of Physical Chemistry B.
Date:
February 3, 2007
Creator:
Gomes, José R. B.; Sousa, Emanuel A.; Gomes, Paula; Vale, Nuno; Gonçalves, Jorge M.; Pandey, Siddharth et al.
Object Type:
Text
System:
The UNT Digital Library
Senior Recital: 2007-02-06 - Daniel Robert Kirkpatrick, percussion
Access:
Use of this item is restricted to the UNT Community
A senior recital presented at the UNT College of Music Recital Hall in partial fulfillment of the Bachelor of Music (BM) degree.
Date:
February 6, 2007
Creator:
Kirkpatrick, Daniel Robert
Object Type:
Sound
System:
The UNT Digital Library
Intelligence Spending: Public Disclosure Issues
This report describes the constituent parts of the intelligence budget, past practice in handling intelligence authorizations and appropriations, the arguments that have been advanced for and against making intelligence spending totals public, a legal analysis of these issues, and a review of the implications of post-Cold War developments on the question. It also describes past congressional interest in keeping intelligence spending totals secret.
Date:
February 15, 2007
Creator:
Best, Richard A., Jr. & Bazan, Elizabeth B.
Object Type:
Report
System:
The UNT Digital Library
Magnetic Profiles in Ferromagnetic/Superconducting Superlattices.
The interplay between ferromagnetism and superconductivity has been of longstanding fundamental research interest to scientists, as the competition between these generally mutually exclusive types of long-range order gives rise to a rich variety of physical phenomena. A method of studying these exciting effects is by investigating artificially layered systems, i.e. alternating deposition of superconducting and ferromagnetic thin films on a substrate, which enables a straight-forward combination of the two types of long-range order and allows the study of how they compete at the interface over nanometer length scales. While originally studies focused on low temperature superconductors interchanged with metallic ferromagnets, in recent years the scope has broadened to include superlattices of high T{sub c} superconductors and colossal magnetoresistance oxides. Creating films where both the superconducting as well as the ferromagnetic layers are complex oxide materials with similar crystal structures (Figure 1), allows the creation of epitaxial superlattices, with potentially atomically flat and ordered interfaces.
Date:
February 28, 2007
Creator:
te Velthuis, S. G. E.; Hoffmann, A.; Santamaria, J.; Division, Materials Science & Madrid, Univ. Complutense de
Object Type:
Report
System:
The UNT Digital Library
Final Work Plan: Investigation of Potential Contamination at the Former USDA Facility in Powhattan, Kansas.
This Work Plan outlines the scope of work to be conducted to investigate the subsurface contaminant conditions at the property formerly leased by the Commodity Credit Corporation (CCC) in Powhattan, Kansas (Figure 1.1). Data obtained during this event will be used to (1) evaluate potential contaminant source areas on the property; (2) determine the vertical and horizontal extent of potential contamination; and (3) provide recommendations for future action, with the ultimate goal of assigning this site No Further Action status. The planned investigation includes groundwater monitoring requested by the Kansas Department of Health and Environment (KDHE), in accordance with Section V of the Intergovernmental Agreement between the KDHE and the Farm Service Agency of the U.S. Department of Agriculture (USDA). The work is being performed on behalf of the CCC/USDA by the Environmental Science Division of Argonne National Laboratory. A nonprofit, multidisciplinary research center operated by the University of Chicago for the U.S. Department of Energy, Argonne provides technical assistance to the CCC/USDA with environmental site characterization and remediation at former CCC/USDA grain storage facilities. Argonne issued a Master Work Plan (Argonne 2002) that has been approved by the KDHE. The Master Work Plan describes the general scope of all …
Date:
February 2, 2007
Creator:
LaFreniere, L. M.
Object Type:
Report
System:
The UNT Digital Library
Sensitivity study of CO2 storage capacity in brine aquifers withclosed boundaries: Dependence on hydrogeologic properties
In large-scale geologic storage projects, the injected volumes of CO{sub 2} will displace huge volumes of native brine. If the designated storage formation is a closed system, e.g., a geologic unit that is compartmentalized by (almost) impermeable sealing units and/or sealing faults, the native brine cannot (easily) escape from the target reservoir. Thus the amount of supercritical CO{sub 2} that can be stored in such a system depends ultimately on how much pore space can be made available for the added fluid owing to the compressibility of the pore structure and the fluids. To evaluate storage capacity in such closed systems, we have conducted a modeling study simulating CO{sub 2} injection into idealized deep saline aquifers that have no (or limited) interaction with overlying, underlying, and/or adjacent units. Our focus is to evaluate the storage capacity of closed systems as a function of various reservoir parameters, hydraulic properties, compressibilities, depth, boundaries, etc. Accounting for multi-phase flow effects including dissolution of CO{sub 2} in numerical simulations, the goal is to develop simple analytical expressions that provide estimates for storage capacity and pressure buildup in such closed systems.
Date:
February 7, 2007
Creator:
Zhou, Q.; Birkholzer, J.; Rutqvist, J. & Tsang, C-F.
Object Type:
Article
System:
The UNT Digital Library
Geometrical Properties of a "Snow-Flake" Divertor
Using a simple set of poloidal field coils, one can reach the situation where the null of the poloidal magnetic field in the divertor region is of a second order, not of the first order as in the usual X-point divertor. Then, the separatrix in the vicinity of the null-point splits the poloidal plane not into four sectors, but into six sectors, making the whole structure looking like a snow-flake (whence a name, [1]). This arrangement allows one to spread the heat load over much broader area than in the case of a standard divertor. A disadvantage of this configuration is in that it is topologically unstable, and, with the current in the plasma varying with time, it would switch either to the standard X-point mode, or to the mode with two X-points close to each other. To avoid this problem, it is suggested to have a current in the divertor coils by roughly 5% higher than in an 'optimum' regime (the one where a snow-flake separatrix is formed). In this mode, the configuration becomes stable and can be controlled by varying the current in the divertor coils in concert with the plasma current; on the other hand, a strong …
Date:
February 7, 2007
Creator:
Ryutov, D. D.
Object Type:
Article
System:
The UNT Digital Library
An array of low-background 3He proportional counters for theSudbury Neutrino Observatory
An array of Neutral-Current Detectors (NCDs) has been builtin order to make a unique measurement of the total active ux of solarneutrinos in the Sudbury Neutrino Observatory (SNO). Data in the thirdphase of the SNO experiment were collected between November 2004 andNovember 2006, after the NCD array was added to improve theneutral-current sensitivity of the SNO detector. This array consisted of36 strings of proportional counters lled with a mixture of 3He and CF4gas capable of detecting the neutrons liberated by the neutrino-deuteronneutral current reaction in the D2O, and four strings lled with a mixtureof 4He and CF4 gas for background measurements. The proportional counterdiameter is 5 cm. The total deployed array length was 398 m. The SNO NCDarray is the lowest-radioactivity large array of proportional countersever produced. This article describes the design, construction,deployment, and characterization of the NCD array, discusses theelectronics and data acquisition system, and considers event signaturesand backgrounds.
Date:
February 1, 2007
Creator:
Amsbaugh, J. F.; Anaya, J. M.; Banar, J.; Bowles, T. J.; Browne, M. C.; Bullard, T. V. et al.
Object Type:
Article
System:
The UNT Digital Library
The groundwater-land-surface-atmosphere connection: soil moisture effects on the atmospheric boundary layer in fully-coupled simulations
This study combines a variably-saturated groundwater flow model and a mesoscale atmospheric model to examine the effects of soil moisture heterogeneity on atmospheric boundary layer processes. This parallel, integrated model can represent spatial variations in land-surface forcing driven by three-dimensional (3D) atmospheric and subsurface components. The development of atmospheric flow is studied in a series of idealized test cases with different initial soil moisture distributions generated by an offline spin-up procedure or interpolated from a coarse-resolution dataset. These test cases are performed with both the fully-coupled model (which includes 3D groundwater flow and surface water routing) and the uncoupled atmospheric model. The effects of the different soil moisture initializations and lateral subsurface and surface water flow are seen in the differences in atmospheric evolution over a 36-hour period. The fully-coupled model maintains a realistic topographically-driven soil moisture distribution, while the uncoupled atmospheric model does not. Furthermore, the coupled model shows spatial and temporal correlations between surface and lower atmospheric variables and water table depth. These correlations are particularly strong during times when the land surface temperatures trigger shifts in wind behavior, such as during early morning surface heating.
Date:
February 2, 2007
Creator:
Maxwell, R M; Chow, F K & Kollet, S J
Object Type:
Article
System:
The UNT Digital Library
Achieving High Flux Amplification in a Gun-driven, Flux-core Spheromak
None
Date:
February 20, 2007
Creator:
Hooper, E. B.; Hill, D. N.; McLean, H. S.; Romero-Talam?s, C. A. & Wood, R. D.
Object Type:
Article
System:
The UNT Digital Library
GeV electron beams from cm-scale channel guided laser wakefieldaccelerator
Laser-wakefield accelerators (LWFA) can produce electricfields of order 10-100 GV/m suitable for acceleration of electrons torelativistic energies. The wakefields are excited by a relativisticallyintense laser pulse propagating through a plasma and have a phasevelocity determined by the group velocity of the light pulse. Twoimportant effects that can limit the acceleration distanceand hence thenet energy gain obtained by an electron are diffraction of the drivelaser pulse and particle-wake dephasing. Diffraction of a focusedultra-short laser pulse can be overcome by using preformed plasmachannels. The dephasing limit can be increased by operating at a lowerplasma density, since this results in an increase in the laser groupvelocity. Here we present detailed results on the generation of GeV-classelectron beams using an intense femtosecond laser beamand a 3.3 cm longpreformed discharge-based plasma channel [W.P. Leemans et al., NaturePhysics 2, 696-699 (2006)]. The use of a discharge-based waveguidepermitted operation at an order ofmagnitude lower density and 15 timeslonger distance than in previous experiments that relied on laserpreformed plasma channels. Laser pulses with peak power ranging from10-50 TW were guided over more than 20 Rayleigh ranges and high-qualityelectron beams with energy up to 1 GeV were obtained by channelling a 40TW peak power laser pulse. The dependence of …
Date:
February 20, 2007
Creator:
Nakamura, K.; Nagler, B.; Toth, Cs.; Geddes, C. G. R.; Schroeder, C.; Esarey, E. et al.
Object Type:
Article
System:
The UNT Digital Library
Disruption of Maternal DNA Repair Increases Sperm-DerivedChromosomal Aberrations
The final weeks of male germ cell differentiation occur in aDNA repair-deficient environment and normal development depends on theability of the egg to repair DNA damage in the fertilizing sperm. Geneticdisruption of maternal DNA double-strand break repair pathways in micesignificantly increased the frequency of zygotes with chromosomalstructural aberrations after paternal exposure to ionizing radiation.These findings demonstrate that radiation-induced DNA sperm lesions arerepaired after fertilization by maternal factors and suggest that geneticvariation in maternal DNA repair can modulate the risk of early pregnancylosses and of children with chromosomal aberrations of paternalorigin.
Date:
February 7, 2007
Creator:
Marchetti, Francesco; Essers, Jeroun; Kanaar, Roland & Wyrobek,Andrew J.
Object Type:
Article
System:
The UNT Digital Library
Research and Development of an Integral Separator for a Centrifugal Gas Processing Facility
A COMPACT GAS PROCESSING DEVICE WAS INVESTIGATED TO INCREASE GAS PRODUCTION FROM REMOTE, PREVIOUSLY UN-ECONOMIC RESOURCES. THE UNIT WAS TESTED ON AIR AND WATER AND WITH NATURAL GAS AND LIQUID. RESULTS ARE REPORTED WITH RECOMMENDATIONS FOR FUTURE WORK.
Date:
February 27, 2007
Creator:
Hays, Lance
Object Type:
Report
System:
The UNT Digital Library
ELECTRON AVALANCHE MODEL OF DIELECTRIC-VACUUM SURFACE BREAKDOWN
The model assumes that an 'initiating event' results in positive ions on the surface near the anode and reverses the direction of the normal component of electric field so that electrons in vacuum are attracted to the dielectric locally. A sequence of surface electron avalanches progresses in steps from the anode to the cathode. For 200 kV across 1 cm, the spacing of avalanches is predicted to be about 13 microns. The time for avalanches to step from the anode to the cathode is predicted to be about a ns.
Date:
February 21, 2007
Creator:
Lauer, E J
Object Type:
Article
System:
The UNT Digital Library
Appliances, Lighting, Electronics, and Miscellaneous EquipmentElectricity Use in New Homes
The "Other" end-uses (appliances, lighting, electronics, andmiscellaneous equipment) continue to grow. This is particularly true innew homes, where increasing floor area and amenities are leading tohigher saturation of these types of devices. This paper combines thefindings of several field studies to assess the current state ofknowledge about the "Other" end-uses in new homes. The field studiesinclude sub-metered measurements of occupied houses in Arizona, Florida,and Colorado, as well as device-level surveys and power measurements inunoccupied new homes. We find that appliances, lighting, electronics, andmiscellaneous equipment can consume from 46 percent to 88 percent ofwhole-house electricity use in current low-energy homes. Moreover, theannual consumption for the "Other" end-uses is not significantly lower innew homes (even those designed for low energy use) compared to existinghomes. The device-level surveys show that builder-installed equipment isa significant contributor to annual electricity consumption, and certaindevices that are becoming more common in new homes, such as structuredwiring systems, contribute significantly to this power consumption. Thesefindings suggest that energy consumption by these "Other" end uses isstill too large to allow cost-effective zero-energy homes.
Date:
February 28, 2007
Creator:
Brown, Richard E.; Rittelman, William; Parker, Danny & Homan,Gregory
Object Type:
Article
System:
The UNT Digital Library
Test Report on ISR Double-Loop, Spray-Cooled Inverter
The Isothermal Systems Research, Inc. (ISR) double-loop, two-phase spray cooling system was designed to use 85 C transmission oil to cool a heat exchanger via a second cooling loop. The heat exchanger condenses the working fluid vapor back to liquid inside a sealed enclosure to allow for continuous spray cooling of electronics. In the ORNL tests, 85 C water/ethylene/glycol (WEG), which has better thermal properties than transmission oil, was substituted for the transmission oil. Because the ISR spray-cooling system requires a second cooling loop, the final inverter might be inherently larger than inverters that do not require a second-loop cooling system. The ISR test setup did not include a dc bus capacitor. Because the insulated gate bipolar transistor (IGBT) conduction test indicated that the ISR test setup could not be properly loaded thermally, no switching tests were conducted. Therefore it was not necessary to attach external capacitors outside the test setup. During load situations not exceeding 400A, the WEG inlet temperature was higher than the WEG outlet temperature. This meant that the 85 C WEG heat exchanger was not cooling the inverter and became a thermal load to the inverter. Only when the load was higher than 400A with a …
Date:
February 1, 2007
Creator:
Hsu, John S; Coomer, Chester; Campbell, Steven L; Wiles, Randy H; Lowe, Kirk T & McFee, Marshall T
Object Type:
Report
System:
The UNT Digital Library
Phosphor-Free Solid State Light Sources
The objective of this work was to demonstrate a light emitting diode that emitted white light without the aid of a phosphor. The device was based on the combination of a nitride LED and a fluorescing ZnO substrate. The early portion of the work focused on the growth of ZnO in undoped and doped form. The doped ZnO was successfully engineered to emit light at specific wavelengths by incorporating various dopants into the crystalline lattice. Thereafter, the focus of the work shifted to the epitaxial growth of nitride structures on ZnO. Initially, the epitaxy was accomplished with molecular beam epitaxy (MBE). Later in the program, metallorganic chemical vapor deposition (MOCVD) was successfully used to grow nitrides on ZnO. By combining the characteristics of the doped ZnO substrate with epitaxially grown nitride LED structures, a phosphor-free white light emitting diode was successfully demonstrated and characterized.
Date:
February 28, 2007
Creator:
Nause, Jeff E; Ferguson, Ian & Doolittle, Alan
Object Type:
Report
System:
The UNT Digital Library
Lithium Insertion Chemistry of Some Iron Vanadates
Lithium insertion into various iron vanadates has been investigated. Fe{sub 2}V{sub 4}O{sub 13} and Fe{sub 4}(V{sub 2}O{sub 7}){sub 3} {center_dot} 3H{sub 2}O have discharge capacities approaching 200 mAh/g above 2.0 V vs. Li{sup +}/Li. Although the potential profiles change significantly between the first and subsequent discharges, capacity retention is unexpectedly good. Other phases, structurally related to FeVO{sub 4}, containing copper and/or sodium ions were also studied. One of these, {beta}-Cu{sub 3}Fe{sub 4}(VO{sub 4}){sub 6}, reversibly consumes almost 10 moles of electrons per formula unit (ca. 240 mAh g{sup -1}) between 3.6 and 2.0 V vs. Li{sup +}/Li, in a non-classical insertion process. It is proposed that both copper and vanadium are electrochemically active, whereas iron(III) reacts to form LiFe{sup III}O{sub 2}. The capacity of the Cu{sub 3}Fe{sub 4}(VO{sub 4}){sub 6}/Li system is nearly independent of cycling rate, stabilizing after a few cycles at 120-140 mAh g{sup -1}. Iron vanadates exhibit better capacities than their phosphate analogues, whereas the latter display more constant discharge potentials.
Date:
February 2, 2007
Creator:
Patoux, Sebastien & Richardson, Thomas J.
Object Type:
Article
System:
The UNT Digital Library