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UNT Libraries Government Documents Department
160
UNT Libraries Special Collections
80
Oklahoma Historical Society
46
Sterling Municipal Library
12
National Museum of the Pacific War/Admiral Nimitz Foundation
7
Alvin Community College
6
Dallas Area Rapid Transit (DART)
5
Livingston Municipal Library
5
Sammy Brown Library
5
Archer Public Library
4
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Collection
Office of Scientific & Technical Information Technical Reports
132
Texas Digital Newspaper Program
104
Tocker Foundation Grant
57
Oklahoma Digital Newspaper Program
51
José L. Castillo Photograph Collection
48
Congressional Research Service Reports
17
The Baytown Sun
12
Altus Times-Democrat
10
Chickasha Newspaper Collection
10
Sapulpa Herald
10
83 More
Year
Month
Day
Type Ia supernova rate at a redshift of ~;0.1
We present the type Ia rate measurement based on two EROS supernova search campaigns (in 1999 and 2000). Sixteen supernovae identified as type Ia were discovered. The measurement of the detection efficiency, using a Monte Carlo simulation, provides the type Ia supernova explosion rate at a redshift {approx} 0.13. The result is 0.125{sub -0.034-0.028}{sup +0.044+0.028} h{sub 70}{sup 2} SNu where 1 SNu = 1 SN/10{sup 10} L{sub {circle_dot}}{sup B}/century. This value is compatible with the previous EROS measurement (Hardin et al. 2000), done with a much smaller sample, at a similar redshift. Comparison with other values at different redshifts suggests an evolution of the type Ia supernova rate.
Date:
May 11, 2004
Creator:
Blanc, G.; Afonso, C.; Alard, C.; Albert, J. N.; Aldering, G.; Amadon, A. et al.
Object Type:
Article
System:
The UNT Digital Library
Initial Operation of the NSTX Fast Tangential Soft X-Ray Camera
Fast, two-dimensional, soft x-ray imaging is a powerful technique for the study of MHD instabilities in tokamak plasmas. We have constructed an ultra-fast frame rate soft x-ray camera for the National Spherical Torus Experiment. It is based on a recently developed 64 x 64 pixel CCD camera capable of capturing 300 frames at up to 500,000 frames per second. A pinhole aperture images the plasma soft x-ray emission (0.2-10 keV) onto a P47 scintillator deposited on a fiber-optic faceplate; the scintillator visible light output is detected and amplified by a demagnifying image intensifier and lens-coupled to the CCD chip. A selection of beryllium foils provides discrimination of low-energy emission. The system is installed on NSTX with a wide-angle tangential view of the plasma. Initial plasma data and an assessment of the system performance are presented.
Date:
May 11, 2004
Creator:
Stratton, B. C.; Feder, R.; Von Goeler, S.; Renda, G. F.; Lowrance, J. L. & Mastrocola, V. J.
Object Type:
Report
System:
The UNT Digital Library
Job scheduling in a heterogenous grid environment
Computational grids have the potential for solving large-scale scientific problems using heterogeneous and geographically distributed resources. However, a number of major technical hurdles must be overcome before this potential can be realized. One problem that is critical to effective utilization of computational grids is the efficient scheduling of jobs. This work addresses this problem by describing and evaluating a grid scheduling architecture and three job migration algorithms. The architecture is scalable and does not assume control of local site resources. The job migration policies use the availability and performance of computer systems, the network bandwidth available between systems, and the volume of input and output data associated with each job. An extensive performance comparison is presented using real workloads from leading computational centers. The results, based on several key metrics, demonstrate that the performance of our distributed migration algorithms is significantly greater than that of a local scheduling framework and comparable to a non-scalable global scheduling approach.
Date:
February 11, 2004
Creator:
Oliker, Leonid; Biswas, Rupak; Shan, Hongzhang & Smith, Warren
Object Type:
Report
System:
The UNT Digital Library
Effects of Radiative Recombination and Photon Recycling on Minority Carrier Lifetime in Epitaxial GaINAsSb Lattice-matched to GaSb
None
Date:
May 11, 2004
Creator:
Anikeev, S.; Donetsky, D.; Belenky, G.; Luryl, S.; Wang, C. A.; Shiau, D. A. et al.
Object Type:
Report
System:
The UNT Digital Library
pH and resistivity of the BCP mix diluted in UPW
Etching plays an important role in the production of superconducting cavities (SRF). As other laboratories engaged in RF superconductivity R and D did, FNAL is also developing a facility for the chemical etching of niobium (Nb) cavities. Two techniques are common accepted for cavity etching: (1) chemical etching--buffered chemical polishing (BCP); and (2) Electropolishing (EP). Among them, at FNAL it was decided to pursue chemical etching, which is considered a reliable technique tested by several labs for many years. In the past, numerous mixtures of acids have been tested leading to the actual buffered chemical polishing mix (BCP) characterized by the following composition by volume: 1 of HF 49 %wt; 1 of HNO{sub 3} 69.5 %wt; 2 of H{sub 3}PO{sub 4} 85 %wt. Because of the dangerous nature of the chemicals involved, safety considerations require the development of a proper process and a reliable control algorithm. For the post-processing rinsing of the cavities, one needs to know the expected pH of the water used to rinse the cavity. On the other hand, for early detection of leaks in the hydraulic system, which is done by measuring the conductivity of the rinsing water used in the process, one needs to understand …
Date:
May 11, 2004
Creator:
al., Cristian Boffo et
Object Type:
Report
System:
The UNT Digital Library
FEPs Screening of Processes and Issues in Drip Shield and Waste Package Degradation
The purpose of this report is to evaluate and document the inclusion or exclusion of features, events and processes (FEPs) with respect to drip shield and waste package modeling used to support the Total System Performance Assessment for License Application (TSPA-LA). Thirty-three FEPs associated with the waste package and drip shield performance have been identified (DTN: MO0407SEPFEPLA.000 [DIRS 170760]). A screening decision, either ''included'' or ''excluded,'' has been assigned to each FEP, with the technical bases for screening decisions, as required by the Nuclear Regulatory Commission (NRC) in 10 CFR 63.114 (d, e, and f) [DIRS 156605]. The FEPs analyses in this report address issues related to the degradation and potential failure of the drip shield and waste package over the post closure regulatory period of 10,000 years after permanent closure. For included FEPs, this report summarizes the disposition of the FEP in TSPA-LA. For excluded FEPs, this report provides the technical bases for the screening arguments for exclusion from TSPA-LA. The analyses are for the TSPA-LA base-case design (BSC 2004 [DIRS 168489]), where a drip shield is placed over the waste package without backfill over the drip shield (BSC 2004 [DIRS 168489]). Each FEP includes one or more specific …
Date:
October 11, 2004
Creator:
Mon, K.
Object Type:
Report
System:
The UNT Digital Library
Formation of hollow nanocrystals through the nanoscale kirkendall effect
We demonstrate that hollow nanocrystals can be synthesized through a mechanism analogous to the Kirkendall Effect, in which pores form due to the difference in diffusion rates between two components in a diffusion couple. Cobalt nanocrystals are chosen as a primary example to show that their reaction in solution with oxygen, sulfur or selenium leads to the formation of hollow nanocrystals of the resulting oxide and chalcogenides. This process provides a general route to the synthesis of hollow nanostructures of large numbers of compounds. A simple extension of this process yields platinum-cobalt oxide yolk-shell nanostructures which may serve as nanoscale reactors in catalytic applications.
Date:
March 11, 2004
Creator:
Yin, Yadong; Rioux, Robert M.; Erdonmez, Can K.; Hughes, Steven; Somorjai, Gabor A. & Alivisatos, A. Paul
Object Type:
Article
System:
The UNT Digital Library
Geologic Investigation of a Potential Site for a Next-Generation Reactor Neutrino Oscillation Experiment -- Diablo Canyon, San Luis Obispo County, CA
This report provides information on the geology and selected physical and mechanical properties of surface rocks collected at Diablo Canyon, San Luis Obispo County, California as part of the design and engineering studies towards a future reactor neutrino oscillation experiment. The main objective of this neutrino project is to study the process of neutrino flavor transformation or neutrino oscillation by measuring neutrinos produced in the fission reactions of a nuclear power plant. Diablo Canyon was selected as a candidate site because it allows the detectors to be situated underground in a tunnel close to the source of neutrinos (i.e., at a distance of several hundred meters from the nuclear power plant) while having suitable topography for shielding against cosmic rays. The detectors have to be located underground to minimize the cosmic ray-related background noise that can mimic the signal of reactor neutrino interactions in the detector. Three Pliocene-Miocene marine sedimentary units dominate the geology of Diablo Canyon: the Pismo Formation, the Monterey Formation, and the Obispo Formation. The area is tectonically active, located east of the active Hosgri Fault and in the southern limb of the northwest trending Pismo Syncline. Most of the potential tunnel for the neutrino detector lies …
Date:
June 11, 2004
Creator:
Onishi, Celia Tiemi; Dobson, Patrick; Nakagawa, Seiji; Glaser, Steven & Galic, Dom
Object Type:
Report
System:
The UNT Digital Library
DOE THREE-DIMENSIONAL STRUCTURE AND PHYSICAL PROPERTIES OF A METHANE HYDRATE DEPOSIT AND GAS RESERVOIR, BLAKE RIDGE
This report contains a summary of work conducted and results produced under the auspices of award DE-FC26-00NT40921, ''DOE Three-Dimensional Structure and Physical Properties of a Methane Hydrate Deposit and Gas Reservoir, Blake Ridge.'' This award supported acquisition, processing, and interpretation of two- and three-dimensional seismic reflection data over a large methane hydrate reservoir on the Blake Ridge, offshore South Carolina. The work supported by this project has led to important new conclusions regarding (1) the use of seismic reflection data to directly detect methane hydrate, (2) the migration and possible escape of free gas through the hydrate stability zone, and (3) the mechanical controls on the maximum thickness of the free gas zone and gas escape.
Date:
November 11, 2004
Creator:
Holbrook, W. Steven
Object Type:
Report
System:
The UNT Digital Library
Hybrid Back Surface Reflector GaInAsSb Thermophotovoltaic Devices
Back surface reflectors have the potential to improve thermophotovoltaic (TPV) device performance though the recirculation of infrared photons. The ''hybrid'' back-surface reflector (BSR) TPV cell approach allows one to construct BSRs for TPV devices using conventional, high efficiency, GaInAsSb-based TPV material. The design, fabrication, and measurements of hybrid BSR-TPV cells are described. The BSR was shown to provide a 4 mV improvement in open-circuit voltage under a constant shortcircuit current, which is comparable to the 5 mV improvement theoretically predicted. Larger improvements in open-circuit voltage are expected in the future with materials improvements.
Date:
May 11, 2004
Creator:
Huang, R. K.; Wang, C. A.; Connors, M. K.; Turner, G. W. & Dashiell, M.
Object Type:
Report
System:
The UNT Digital Library
Measurement and simulation of the UMERbeam in the sourceregion
As the beam propagates in the University of Maryland Electron Ring (UMER) complex transverse density structure including halos has been observed. A primary objective of the experiment is to understand the evolution of a space-charge-dominated beam as it propagates over a substantial distance. It is therefore important to understand which details of the beam structure result from propagation of the beam in the ring and which characteristics result from the specific details of the initial distribution. Detailed measurements of the initial beam characteristics have therefore been performed. These include direct measurement of the density using a phosphor screen, as well as pepper pot measurements of the initial transverse distribution function. Detailed measurements of the distribution function have also been obtained by scanning a pinhole aperture across a beam diameter, and recording phosphor screen pictures of the beam downstream of the pinhole. Simulations of the beam characteristics in the gun region have also been performed using the WARP P.I.C. code. From these simulations, the observed behavior has been attributed to a combination of perturbations to the transverse distribution by a cathode grid that is used to modulate the beam current, as well as the complex transverse dynamics that results from the …
Date:
June 11, 2004
Creator:
Haber, I.; Bernal, S.; Kishek, R. A.; O'Shea, P. G.; Quinn, B.; Reiser, M. et al.
Object Type:
Article
System:
The UNT Digital Library
Performance Budgeting: OMB's Performance Rating Tool Presents Opportunities and Challenges For Evaluating Program Performance
Testimony issued by the General Accounting Office with an abstract that begins "The Office of Management and Budget's (OMB) Performance Assessment Rating Tool (PART) is meant to provide a consistent approach to evaluating federal programs during budget formulation. The subcommittee asked GAO to discuss its overall findings and recommendations concerning PART, based on a recent report, Performance Budgeting: Observations on the Use of OMB's Program Assessment Rating Tool for the Fiscal Year 2004 Budget (GAO-04-174)."
Date:
March 11, 2004
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
[Email from Bob Gray to Charles Francis, October 11, 2004]
An email from Bob Gray to Charles C. Francis about a clipping from the San Francisco Chronicle and Francis' progress with gay and lesbian rights.
Date:
October 11, 2004
Creator:
Gray, Bob
Object Type:
Letter
System:
The UNT Digital Library
The Archer Advocate (Holliday, Tex.), Vol. 2, No. 19, Ed. 1 Wednesday, August 11, 2004
Weekly newspaper from Holliday, Texas that includes local, state, and national news along with advertising.
Date:
August 11, 2004
Creator:
Thomas, John
Object Type:
Newspaper
System:
The Portal to Texas History
The Archer Advocate (Holliday, Tex.), Vol. 1, No. 45, Ed. 1 Wednesday, February 11, 2004
Weekly newspaper from Holliday, Texas that includes local, state, and national news along with advertising.
Date:
February 11, 2004
Creator:
Thomas, John
Object Type:
Newspaper
System:
The Portal to Texas History
[Man standing in doorway of train car]
Fotografía de un hombre con sombrero de vaquero, camisa de vestir y vaqueros azules, de pie en la puerta de un tren. El hombre parece estar tomando notas en una hoja de papel sobre sus palmas. A la derecha de la fotografía se ve un montón de sillas de plástico.
Date:
November 11, 2004
Creator:
Castillo, José L.
Object Type:
Photograph
System:
The Portal to Texas History
[Room with paneled walls and tiled floor]
Una fotografía de una habitación. Hay varios marcos en la pared, junto con un pato montado y una tira de papel pintado de pato. A la izquierda de la foto hay un sofá estampado con un cojín con un pavo. Junto al sofá hay una mesa con una lámpara iluminada frente a la ventana. Frente al sofá hay una pequeña mesa con varias revistas de Texas. A lo largo de la pared hay un banco con cojines, con material de lectura adicional a un lado. También se pueden ver calabazas decorativas.
Date:
November 11, 2004
Creator:
Castillo, José L.
Object Type:
Photograph
System:
The UNT Digital Library
[View of plants and water]
Photograph of Texas landscape showing water surrounded by rocks and vegetation.
Date:
November 11, 2004
Creator:
Castillo, José L.
Object Type:
Photograph
System:
The UNT Digital Library
[Plants, rocks, and water]
Fotografía de un paisaje de Texas que muestra un río que fluye alrededor de rocas con vegetación tanto en el primer plano como en el fondo.
Date:
November 11, 2004
Creator:
Castillo, José L.
Object Type:
Photograph
System:
The Portal to Texas History
Protocols for Thermoluninescence and Optically Stimulated Luminescence Research at DOSAR
The Life Sciences Division (LSD) of Oak Ridge National Laboratory (ORNL) has a long record of radiation dosimetry research at the Dosimetry Applications Research (DOSAR) facility complex. These facilities have been used by a broad segment of the research community to perform a variety of experiments in areas including, but not limited to, radiobiology, radiation dosimeter and instrumentation development and calibration, and materials testing in a variety of radiation environments. Collaborations with the University of Tennessee-Knoxville (UTK) have also led to important contributions in the area of archaeometry, particularly as it relates to the use of radiation dosimetry to date archaeological artifacts. This manual is to serve as the primary instruction and operation manual for dosimetric and archaeometric research at DOSAR involving thermoluminescence (TL) and optically stimulated luminescence (OSL). Its purpose is to (1) provide protocols for common practices associated with the research, (2) outline the relevant organizational structure, (3) identify the Quality Assurance plan, and (4) describe all the procedures, operations, and responsibilities for safe and proper operation of associated equipment. Each person who performs research at DOSAR using TL/OSL equipment is required to read the latest revision of this manual and be familiar with its contents, and to …
Date:
October 11, 2004
Creator:
Bernal, S. M. & Bogard, J. S.
Object Type:
Report
System:
The UNT Digital Library
Archer County News (Archer City, Tex.), No. 46, Ed. 1 Thursday, November 11, 2004
Weekly newspaper from Archer City, Texas that includes local, state, and national news along with advertising.
Date:
November 11, 2004
Creator:
Lewis, Shelley
Object Type:
Newspaper
System:
The Portal to Texas History
Archer County News (Archer City, Tex.), No. 11, Ed. 1 Thursday, March 11, 2004
Weekly newspaper from Archer City, Texas that includes local, state, and national news along with advertising.
Date:
March 11, 2004
Creator:
Lewis, Shelley
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 83, No. 312, Ed. 1 Monday, October 11, 2004
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
October 11, 2004
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 83, No. 253, Ed. 1 Wednesday, August 11, 2004
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
August 11, 2004
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History