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Design Methodology and Consideratios for NOVA 53 MHZ RF Cavities
The NO?A Experiment will construct a detector optimized for electron neutrino detection in the existing Neutrino at Main Injector (NuMI) beamline. This beamline is capable of operating at 400 kW of primary beam power and the upgrade will allow up to 700 kW. The cavities will operate at 53 MHz and three of them will be installed in the Recycler beamline. Thermal stability of the cavities is crucial since this affects the tuning. Results of finite element thermal and structural analysis involving the copper RF cavity will be presented.
Date:
May 19, 2010
Creator:
Ader, C. & Wildman, D.W.
Object Type:
Article
System:
The UNT Digital Library
Fresh Water Generation from Aquifer-Pressured Carbon Storage
Can we use the pressure associated with sequestration to make brine into fresh water? This project is establishing the potential for using brine pressurized by Carbon Capture and Storage (CCS) operations in saline formations as the feedstock for desalination and water treatment technologies including reverse osmosis (RO) and nanofiltration (NF). Possible products are: Drinking water, Cooling water, and Extra aquifer space for CO{sub 2} storage. The conclusions are: (1) Many saline formation waters appear to be amenable to largely conventional RO treatment; (2) Thermodynamic modeling indicates that osmotic pressure is more limiting on water recovery than mineral scaling; (3) The use of thermodynamic modeling with Pitzer's equations (or Extended UNIQUAC) allows accurate estimation of osmotic pressure limits; (4) A general categorization of treatment feasibility is based on TDS has been proposed, in which brines with 10,000-85,000 mg/L are the most attractive targets; (5) Brines in this TDS range appear to be abundant (geographically and with depth) and could be targeted in planning future CCS operations (including site selection and choice of injection formation); and (6) The estimated cost of treating waters in the 10,000-85,000 mg/L TDS range is about half that for conventional seawater desalination, due to the anticipated pressure …
Date:
February 19, 2010
Creator:
Aines, R. D.; Wolery, T. J.; Bourcier, W. L.; Wolfe, T. & Haussmann, C.
Object Type:
Article
System:
The UNT Digital Library
A Dual Channel X-ray Spectrometer for Fast Ignition Research
A new Dual Channel Highly Ordered Pyrolytic Graphite (DC-HOPG) x-ray spectrometer was developed to study laser-generated electron beam transport. The instrument uses a pair of graphite crystals and has the advantage of simultaneously detecting self emission from low-Z materials in first diffraction order and high-Z materials in second order. The emissions from the target are detected using a pair of parallel imaging plates positioned in a such way that the noise from background is minimized and the mosaic focusing is achieved. Initial tests of the diagnostic on Titan laser (I {approx} 10{sup 20} W/cm{sup 2}, {tau} = 0.7 ps) show excellent signal-to-noise ratio (SNR) > 1000 for the low energy channel and SNR > 400 for the high energy channel.
Date:
April 19, 2010
Creator:
Akli, K. U.; Patel, P. K.; Van Maren, R.; Stephens, R. B.; Key, M. H.; Higginson, D. P. et al.
Object Type:
Article
System:
The UNT Digital Library
The 2010 Oil Spill: MMS/BOEMRE and NEPA
This report reviews the environmental procedures required following the explosion of an oil well on a tract leased by BP from the federal government.
Date:
August 19, 2010
Creator:
Alexander, Kristina
Object Type:
Report
System:
The UNT Digital Library
A Review of X-ray Diagnostic Calibrations in the 2 to 100 keV Region Using the High Energy X-ray Calibration Facility (HEX)
The precise and accurate measurement of X-rays in the 2 keV to 100 keV region is crucial to the understanding of HED plasmas and warm dense matter in general. With the emergence of inertially confined plasma facilities as the premier platforms for ICF, laboratory astrophysics, and national security related plasma experiments, the need to calibrate diagnostics in the high energy X-ray regime has grown. At National Security Technologies High Energy X-ray Calibration Facility (HEX) in Livermore, California, X-ray imagers, filter-fluorescer spectrometers, crystal spectrometers, image plates, and nuclear diagnostics are calibrated. The HEX can provide measurements of atomic line radiation, X-ray flux (accuracy within 10%), and X-ray energy (accuracy within 1%). The HEX source is comprised of a commercial 160 kV X-ray tube, a fluorescer wheel, a filter wheel, and a lead encasement. The X-ray tube produces a Tungsten bremsstrahlung spectrum which causes a foil to fluoresce line radiation. To minimize bremsstrahlung in the radiation for calibration we also provide various foils as filters. For experimental purposes, a vacuum box capable of 10{sup -7} Torr, as well as HPGe and CdTe radiation detectors, are provided on an optical table. Most geometries and arrangements can be changed to meet experimental needs.
Date:
May 19, 2010
Creator:
Ali, Zaheer; Pond, T.; Buckles, R. A.; Maddox, B. R.; Chen, C. D.; DeWald, E. L. et al.
Object Type:
Article
System:
The UNT Digital Library
Design and Implementation of a Metadata-rich File System
Despite continual improvements in the performance and reliability of large scale file systems, the management of user-defined file system metadata has changed little in the past decade. The mismatch between the size and complexity of large scale data stores and their ability to organize and query their metadata has led to a de facto standard in which raw data is stored in traditional file systems, while related, application-specific metadata is stored in relational databases. This separation of data and semantic metadata requires considerable effort to maintain consistency and can result in complex, slow, and inflexible system operation. To address these problems, we have developed the Quasar File System (QFS), a metadata-rich file system in which files, user-defined attributes, and file relationships are all first class objects. In contrast to hierarchical file systems and relational databases, QFS defines a graph data model composed of files and their relationships. QFS incorporates Quasar, an XPATH-extended query language for searching the file system. Results from our QFS prototype show the effectiveness of this approach. Compared to the de facto standard, the QFS prototype shows superior ingest performance and comparable query performance on user metadata-intensive operations and superior performance on normal file metadata operations.
Date:
January 19, 2010
Creator:
Ames, S; Gokhale, M B & Maltzahn, C
Object Type:
Report
System:
The UNT Digital Library
Guinea: Background and Relations with the United States
This report discusses the current political conditions in Guinea, as well as the considerable changes to Guinea's political landscape that have taken place over the past two years. The report also discusses U.S. interests and associated policy challenges in Guinea, centering around democratization, counternarcotics issues, regional stability, and socioeconomic development, among other issues.
Date:
July 19, 2010
Creator:
Arieff, Alexis & Cook, Nicolas
Object Type:
Report
System:
The UNT Digital Library
Out of Darkness into Light: 1 Peter 2:9-12
Lecture given Sunday, September 19, 2010, 7:00 PM at Abilene Christian University
Date:
September 19, 2010
Creator:
Atchley, Rick
Object Type:
Sound
System:
The Portal to Texas History
Burushaski story "Nuusheerwaane Us" (Wife of Nausherwan King)
Recording of Imam Yar Baig reciting the story "Nuusheerwaane Us" (Wife of Nausherwan King) in the Yasin dialect of Burushaski.
Date:
June 19, 2010
Creator:
Baig, Imam Yar
Object Type:
Sound
System:
The UNT Digital Library
Quantification of thin film crystallographic orientation using X-ray diffraction with an area detector
As thin films become increasingly popular (for solar cells, LEDs, microelectronics, batteries), quantitative morphological information is needed to predict and optimize the film's electronic, optical and mechanical properties. This quantification can be obtained quickly and easily with X-ray diffraction using an area detector and synchrotron radiation in two simple geometries. In this paper, we describe a methodology for constructing complete pole figures for thin films with fiber texture (isotropic in-plane orientation). We demonstrate this technique on semicrystalline polymer films, self-assembled nanoparticle semiconductor films, and randomly-packed metallic nanoparticle films. This method can be immediately implemented to help understand the relationship between film processing and microstructure, enabling the development of better and less expensive electronic and optoelectronic devices.
Date:
February 19, 2010
Creator:
Baker, Jessica L; Jimison, Leslie H; Mannsfeld, Stefan; Volkman, Steven; Yin, Shong; Subramanian, Vivek et al.
Object Type:
Article
System:
The UNT Digital Library
Simulations for experimental study of warm dense matter and inertial fusion energy applications on NDCX-II
The Neutralized Drift Compression Experiment II (NDCX II) is an induction accelerator planned for initial commissioning in 2012. The final design calls for a {approx}3 MeV, {approx}30 A Li{sup +} ion beam, delivered in a bunch with characteristic pulse duration of 1 ns, and transverse dimension of order 1 mm. The purpose of NDCX II is to carry out experimental studies of material in the warm dense matter regime, and ion beam/hydrodynamic coupling experiments relevant to heavy ion based inertial fusion energy. In preparation for this new machine, we have carried out hydrodynamic simulations of ion-beam-heated, metallic solid targets, connecting quantities related to observables, such as brightness temperature and expansion velocity at the critical frequency, with the simulated fluid density, temperature, and velocity. We examine how these quantities depend on two commonly used equations of state.
Date:
March 19, 2010
Creator:
Barnard, J. J.; Armijo, J.; Bieniosek, F. M.; Friedman, A.; Hay, M. J.; Henestroza, E. et al.
Object Type:
Article
System:
The UNT Digital Library
Political Status of Puerto Rico: Options for Congress
This report discusses the current U.S.-Puerto Rico relationship, the history of said relationship, and the current political state of Puerto Rico, as well as relevant pieces of U.S. Congressional legislation concerning Puerto Rico.
Date:
May 19, 2010
Creator:
Bea, Keith & Garrett, R. Sam
Object Type:
Report
System:
The UNT Digital Library
High statistics analysis using anisotropic clover lattices: (III) Baryon-baryon interactions
Low-energy baryon-baryon interactions are calculated in a high-statistics lattice QCD study on a single ensemble of anisotropic clover gauge-field configurations at a pion mass of m{sub {pi}} {approx} 390 MeV, a spatial volume of L{sup 3} {approx} (2.5 fm){sup 3}, and a spatial lattice spacing of b {approx} 0.123 fm. Luescher's method is used to extract nucleon-nucleon, hyperon-nucleon and hyperon-hyperon scattering phase shifts at one momentum from the one- and two-baryon ground-state energies in the lattice volume. The isospin-3/2 N{Sigma} interactions are found to be highly spin-dependent, and the interaction in the {sup 3}S{sub 1} channel is found to be strong. In contrast, the N{Lambda} interactions are found to be spin-independent, within the uncertainties of the calculation, consistent with the absence of one-pion-exchange. The only channel for which a negative energy-shift is found is {Lambda}{Lambda}, indicating that the {Lambda}{Lambda} interaction is attractive, as anticipated from model-dependent discussions regarding the H-dibaryon. The NN scattering lengths are found to be small, clearly indicating the absence of any fine-tuning in the NN-sector at this pion mass. This is consistent with our previous Lattice QCD calculation of NN interactions. The behavior of the signal-to-noise ratio in the baryon-baryon correlation functions, and in the ratio …
Date:
January 19, 2010
Creator:
Beane, S; Detmold, W; Lin, H; Luu, T; Orginos, K; Savage, M et al.
Object Type:
Article
System:
The UNT Digital Library
South Texas Catholic (Corpus Christi, Tex.), Vol. 45, No. 4, Ed. 1 Friday, February 19, 2010
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:
February 19, 2010
Creator:
Beaton, Paula J.
Object Type:
Newspaper
System:
The Portal to Texas History
South Texas Catholic (Corpus Christi, Tex.), Vol. 45, No. 6, Ed. 1 Friday, March 19, 2010
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:
March 19, 2010
Creator:
Beaton, Paula J.
Object Type:
Newspaper
System:
The Portal to Texas History
Leaving Eden: Grace and Brokenness in Christian and Contemporary Art.
Lecture given Sunday, September 19, 2010, 8:30 PM at Abilene Christian University: "How are we to encounter God in Art that fails to honestly confront the brokenness and god-forsakenness in the world? An artist and psychologist suggest we must "leave Eden" to find God in the world."
Date:
September 19, 2010
Creator:
Beck, Richard & McGregor, Dan
Object Type:
Sound
System:
The Portal to Texas History
BRCA1 loss pre-existing in small subpopulations of prostate cancer is associated with advanced disease and metastatic spread to lymph nodes and peripheral blood
A recent study concluded that serum prostate specific antigen (PSA)-based screening is beneficial for reducing the lethality of PCa, but was also associated with a high risk of 'overdiagnosis'. Nevertheless, also PCa patients who suffered from organ confined tumors and had negative bone scans succumb to distant metastases after complete tumor resection. It is reasonable to assume that those tumors spread to other organs long before the overt manifestation of metastases. Our current results confirm that prostate tumors are highly heterogeneous. Even a small subpopulation of cells bearing BRCA1 losses can initiate PCa cell regional and distant dissemination indicating those patients which might be at high risk of metastasis. A preliminary study performed on a small cohort of multifocal prostate cancer (PCa) detected BRCA1 allelic imbalances (AI) among circulating tumor cells (CTCs). The present analysis was aimed to elucidate the biological and clinical role of BRCA1 losses on metastatic spread and tumor progression in prostate cancer patients. Experimental Design: To map molecular progression in PCa outgrowth we used FISH analysis of tissue microarrays (TMA), lymph node sections and CTC from peripheral blood. We found that 14% of 133 tested patients carried monoallelic BRCA1 loss in at least one tumor focus. …
Date:
March 19, 2010
Creator:
Bednarz, Natalia; Eltze, Elke; Semjonow, Axel; Rink, Michael; Andreas, Antje; Mulder, Lennart et al.
Object Type:
Report
System:
The UNT Digital Library
Tax Reform: An Overview of Proposals in the 111th Congress
This report primarily covers fundamental tax reform by discussing background and proposals for review during the 111th Congress. It includes sections about fundamental tax reform, the relationship between income and consumption, what should be taxed, types of broad-based consumption taxes, international comparisons, other types of fundamental tax reform, legislative proposals and other legislation, and sections looking at other specific kinds of taxation.
Date:
March 19, 2010
Creator:
Bickley, James M.
Object Type:
Report
System:
The UNT Digital Library
Design Parameters and Objectives of a High-Resolution X-ray Imaging Crystal Spectrometer for the Large Helical Device (LHD)
A high-resolution X-ray imaging crystal spectrometer, whose instrumental concept was thoroughly tested on NSTX and Alcator C-Mod, is presently being designed for LHD. The instrument will record spatially resolved spectra of helium-like Ar16+ and provide ion temperature profiles with spatial and temporal resolutions of 1 cm and > 10 ms which are obtained by a tomographic inversion of the spectral data, using the stellarator equilibrium reconstruction codes, STELLOPT and PIES. Since the spectrometer will be equipped with radiation hardened, high count rate, PILATUS detectors,, it is expected to be operational for all experimental conditions on LHD, which include plasmas of high density and plasmas with auxiliary RF and neutral beam heating. The special design features required by the magnetic field structure at LHD will be described.
Date:
May 19, 2010
Creator:
Bitter, M.; Gates, D.; Neilson, H.; Reiman, A.; Roquemore, A. L.; Morita, S. et al.
Object Type:
Report
System:
The UNT Digital Library
Doctoral Recital: 2010-11-19 - Tyrone Block, bass trombone
Recital presented at the UNT College of Music Voertman Hall in partial fulfillment of the Doctor of Musical Arts (DMA) degree.
Date:
November 19, 2010
Creator:
Block, Tyrone
Object Type:
Sound
System:
The UNT Digital Library
Conservation Laws for Coupled Hydro-mechanical Processes in Unsaturated Porous Media: Theory and Implementation
We develop conservation laws for coupled hydro-mechanical processes in unsaturated porous media using three-phase continuum mixture theory. From the first law of thermodynamics, we identify energy-conjugate variables for constitutive modeling at macroscopic scale. Energy conjugate expressions identified relate a certain measure of effective stress to the deformation of the solid matrix, the degree of saturation to the matrix suction, the pressure in each constituent phase to the corresponding intrinsic volume change of this phase, and the seepage forces to the corresponding pressure gradients. We then develop strong and weak forms of boundary-value problems relevant for 3D finite element modeling of coupled hydro-mechanical processes in unsaturated porous media. The paper highlights a 3D numerical example illustrating the advances in the solution of large-scale coupled finite element systems, as well as the challenges in developing more predictive tools satisfying the basic conservation laws and the observed constitutive responses for unsaturated porous materials.
Date:
February 19, 2010
Creator:
Borja, R. I. & White, J. A.
Object Type:
Book
System:
The UNT Digital Library
Economic Development Administration: A Review of Elements of Its Statutory History
This report discusses the Economic Development Administration, which was created with the enactment of the Public Works and Economic Development Act of 1965 and has a 45-year history of supporting job creation and long-term economic recovery efforts in the nation's economically distressed areas.
Date:
May 19, 2010
Creator:
Boyd, Eugene
Object Type:
Report
System:
The UNT Digital Library
Interim Continuing Resolutions (CRs): Potential Impacts on Agency Operations
Continuing appropriations acts, commonly known as continuing resolutions (CRs), have been an integral component of the annual appropriations process for decades. When Congress and the President do not reach final decisions about one or more regular appropriations acts, they often negotiate and enact a CR. One type of CR used is an "interim" CR, which provides agencies with stopgap funding for a period of time until final appropriations decisions are made, or until enactment of another interm CR. This report analyzes three major potential impacts that interim CRs might have on agency operations.
Date:
November 19, 2010
Creator:
Brass, Clinton T.
Object Type:
Report
System:
The UNT Digital Library
OMB Controls on Agency Mandatory Spending Programs: "Administrative PAYGO" and Related Issues for Congress
This CRS report focuses first on the Office of Management and Budget (OMB) May 2005 memorandum and the process it outlines. The report then discusses one case where the process appears to have been implemented. It then discusses other potential implications, if the OMB process were widely utilized in practice. Next, the report discusses potential options for Congress.
Date:
August 19, 2010
Creator:
Brass, Clinton T. & Monke, Jim
Object Type:
Report
System:
The UNT Digital Library