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Office of Scientific & Technical Information Technical Reports
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108
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94
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61
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Optimization of the Configuration of Pixilated Detectors Based on the Sgabbib-Nyquist Theory for the X-ray Spectroscopy of Hot Tokamak Plasmas
This paper describes an optimization of the detector configuration, based on the Shannon-Nyquist theory, for two major x-ray diagnostic systems on tokamaks and stellarators: x-ray imaging crystal spectrometers and x-ray pinhole cameras. Typically, the spectral data recorded with pixilated detectors are oversampled, meaning that the same spectral information could be obtained using fewer pixels. Using experimental data from Alcator C-Mod, we quantify the degree of oversampling and propose alternate uses for the redundant pixels for additional diagnostic applications.
Date:
August 9, 2012
Creator:
: E. Wang, P. Beiersdorfer, M. Bitter, L.F. Delgado-Apricio, K.W. Hill and N. Pablant
Object Type:
Article
System:
The UNT Digital Library
FUEL HANDLING FACILITY WORKER DOSE ASSESSMENT
The purpose of this design calculation is to estimate radiation doses received by personnel working in the Fuel Handling Facility (FHF) of the Monitored Geological Repository (MGR). The FHF is a surface facility supporting waste handling operations i.e. receive transportation casks, transfer wastes, prepare waste packages, and ship out loaded waste packages and empty casks. The specific scope of work contained in this calculation covers both collective doses and individual worker group doses on an annual basis, and includes the contributions due to external and internal radiation. The results are also limited to normal operations only. Results of this calculation will be used to support the FHF design and License Application.
Date:
August 9, 2004
Creator:
Achudume, A.
Object Type:
Report
System:
The UNT Digital Library
New Crystalline Materials for Nonlinear Frequency Conversion, Electro-Optic Modulation, and Mid-Infrared Gain Media
New crystalline materials were investigated for applications in frequency conversion of near-infrared wavelengths and as gain media for tunable mid-infrared solid-state lasers. GaCa{sub 4}O(BO{sub 3}){sub 3} (GdCOB), YCa{sub 4}O(BO{sub 3}){sub 3} (YCOB), LaCa{sub 4}O(BO{sub 3}){sub 3} (LaCOB), and Gd{sub 0.275}Y{sub 0.725}Ca{sub 4}O(BO{sub 3}){sub 3} were characterized for frequency conversion of 1 {micro}m lasers. For type I doubling at 1064 nm, LaCOB, GdCOB, and YCOB were found to have effective coupling coefficients (d{sub eff}) of 0.52 {+-} 0.05, 0.78 {+-} 0.06, and 1.12 {+-} 0.07 pm/V, respectively. LaCOB was measured to have angular and thermal sensitivities of 1224 {+-} 184 (cm-rad){sup -1} and < 0.10 (cm-{sup o}C){sup -1}, respectively. The effective coupling coefficient for type II noncritically phasematched (NCPM) doubling at 1064 nm in Gd{sub 0.275}Y{sub 0.725}Ca{sub 4}O(BO{sub 3}){sub 3} was measured to be 0.37 {+-} 0.04 pm/V. We predict LaCOB to have a type I NCPM fundamental wavelength of 1042 {+-} 1.5 nm. Due to its low angular and thermal sensitivities for doubling near 1047 nm, LaCOB has potential for frequency doubling of high-average power Nd:LiYF{sub 4} and Yb:Sr{sub 5}(P0{sub 4}){sub 3}F lasers. LaCOB, GdCOB, and YCOB were also investigated for optical parametric oscillator applications and we determined that they …
Date:
August 9, 2002
Creator:
Adams, J.
Object Type:
Report
System:
The UNT Digital Library
ILC Linac R&D at SLAC
Since the ITRP recommendation in August 2004 to use superconducting rf technology for a next generation linear collider, the former NLC Group at SLAC has been actively pursuing a broad range of R&D for this collider (the ILC). In this paper, the programs concerning linac technology are reviewed. Current activities include the development of a Marx-style modulator and a 10 MW sheet-beam klystron, operation of an L-band (1.3 GHz) rf source using an SNS HVCM modulator and commercial klystrons, design of a more efficient and less costly rf distribution system, construction of a coupler component test stand, fabrication of a prototype positron capture cavity, beam tests of prototype S-band linac beam position monitors and preparations for magnetic center stability measurements of a prototype SC linac quad.
Date:
August 9, 2006
Creator:
Adolphsen, C.
Object Type:
Article
System:
The UNT Digital Library
Proposed U.S.-EU Trade Negotiations: Hitting Pause on a Trade War?
This report discusses the announcement by the United States and European Union (EU) that they are at a "new phase" in their relationship for "freer, fairer, and more reciprocal trade." The announcement came on July 25, 2018 at a challenging time for transatlantic trade relations.
Date:
August 9, 2018
Creator:
Akhtar, Shayerah Ilias
Object Type:
Report
System:
The UNT Digital Library
Experimental and Theoretical Investigation of Multiphase Flow in Fractured Porous media, SUPRI TR-116, Topical Report
The fluid transfer parameters between rock matrix and fracture are not well known. Consequently, simulation of fractured reservoirs uses, in general, very crude and unproven hypotheses such as zero capillary pressure in the fracture and/or relative permeability linear with saturation. In order to improve the understanding of flow in fractured media, an experimental study was conducted and numerical simulations of the experiments were made. A laboratory flow apparatus was built to obtain data on water- air imbibition and oil-water drainage displacements in horizontal single-fractured block systems. For this purpose, two configurations have been used: a two-block system with a 1 mm spacer between the blocks, and a two-block system with no spacer. During the experiments, porosity and saturation measurements along the cores have been made utilizing an X-ray Computerized Tomography (CT) scanner. Saturation images were reconstructed in 3-D to observe matrix-fracture interactions. Differences in fluid saturations and relative permeabilities caused by changes in fracture width have also been analyzed.
Date:
August 9, 1999
Creator:
Akin, Serhat; Castanier, Louis M. & German, Edgar Rene Rangel
Object Type:
Report
System:
The UNT Digital Library
Computer Modeling of Saltstone Landfills by Intera Environmental Consultants
This report summaries the computer modeling studies and how the results of these studies were used to estimate contaminant releases to the groundwater. These modeling studies were used to improve saltstone landfill designs and are the basis for the current reference design. With the reference landfill design, EPA Drinking Water Standards can be met for all chemicals and radionuclides contained in Savannah River Plant waste salts.
Date:
August 9, 2001
Creator:
Albenesius, E.L.
Object Type:
Report
System:
The UNT Digital Library
Field Testing of the COTS DESI/DART-MS/MS System Against High Explosives Residues
None
Date:
August 9, 2013
Creator:
Alcaraz, A.
Object Type:
Report
System:
The UNT Digital Library
Droplet phase characteristics in liquid-dominated steam--water nozzle flow
An experimental study was undertaken to determine the droplet size distribution, the droplet spatial distribution and the mean droplet velocity in low-quality, steam-water flow from a rectangular cross-section, converging-diverging nozzle. A unique forward light scattering technique was developed for droplet size distribution measurements. Droplet spatial variations were investigated using light transmission measurements, and droplet velocities were measured with a laser-Doppler velocimeter (LDV) system incorporating a confocal Fabry-Perot interferometer. Nozzle throat radius of curvature and height were varied to investigte their effects on droplet size. Droplet size distribution measurements yielded a nominal Sauter mean droplet diameter of 1.7 ..mu..m and a nominal mass-mean droplet diameter of 2.4 ..mu..m. Neither the throat radius of curvature nor the throat height were found to have a significant effect upon the nozzle exit droplet size. The light transmission and LDV measurement results confirmed both the droplet size measurements and demonstrated high spatial uniformity of the droplet phase within the nozzle jet flow. One-dimensional numerical calculations indicated that both the dynamic breakup (thermal equilibrium based on a critical Weber number of 6.0) and the boiling breakup (thermal nonequilibrium based on average droplet temperature) models predicted droplet diameters on the order of 7.5 ..mu..m, which are approximately …
Date:
August 9, 1978
Creator:
Alger, T.W.
Object Type:
Report
System:
The UNT Digital Library
Hydraulic Motor
Patent for hybraulic motor. Illustration included.
Date:
August 9, 1904
Creator:
Allen, William W.
Object Type:
Patent
System:
The Portal to Texas History
Urban Dispersion Program MSG05 Field Study: Summary of Tracer and Meteorological Measurements
The Urban Dispersion Program is a multi-year project, funded by the U.S. Department of Homeland Security, to better understand the flow and dispersion of airborne contaminants through and around the deep street canyons of New York City. The first tracer and meteorological field study was a limited study conducted during March 2005 near the Madison Square Garden in midtown Manhattan. Six safe, inert, gaseous perfluorocarbon tracers were released simultaneously at five street-level locations during two experimental days. In addition to collecting tracer data, meteorological data were also collected. Brookhaven National Laboratory conducted the bulk of the tracer and meteorological field efforts with Pacific Northwest National Laboratory and Stevens Institute of Technology assisting by measuring the vertical profile of winds. The Environmental Protection Agency worked with Brookhaven National Laboratory in accomplishing the personal exposure component of the study. This report presents some results from this analysis. In general, different release locations showed vastly different plume footprints for tracer materials, and the situation was made very complex with upwind and/or crosswind transport of tracer near street-level for the different release locations. Overall wind speeds and directions upwind and over the city were generally constant throughout each of the two experimental periods.
Date:
August 9, 2006
Creator:
Allwine, K Jerry & Flaherty, Julia E.
Object Type:
Report
System:
The UNT Digital Library
The LLL Transient Electromagnetic Measurement Facility: A Brief Description
None
Date:
August 9, 1974
Creator:
Anderson, R. A.; Landt, J. A.; Deadrick, F. J. & Miller, E. K.
Object Type:
Report
System:
The UNT Digital Library
Transition From in-Plane to Out-of-Plane Azimuthal Enhancement in Au+Au Collisions
The incident energy at which the azimuthal distributions in semi-central heavy ion collisions change from in-plane to out-of-plane enhancement--E{sub tran} is studied as a function of mass of emitted particles, their transverse momentum and centrality for Au+Au collisions. The analysis is performed in a reference frame rotated with the sidewards flow angle ({Theta}{sub flow}) relative to the beam axis. A systematic decrease of E{sub tran} as function of mass of the reaction products, their transverse momentum and collision centrality is evidenced. The predictions of a microscopic transport model (IQMD) are compared with the experimental results.
Date:
August 9, 2000
Creator:
Andronic, A.; Stoicea, G.; Petrovici, M.; Simion, V.; Crochet, P.; Alard, J. P. et al.
Object Type:
Article
System:
The UNT Digital Library
An Experimental Investigation of Foam Flow in Homogeneous and Heterogeneous Porous Media, SUPRI TR-112
Foam is used to reduce the high mobility of gas-drive fluids and improve the contact between oil and these injected fluids. We require a better understanding of the effect of surfactant concentration on foam flow in porous media. Besides this, the literature on foam flow and transport in heterogeneous systems is sparse although the field situation is primarily heterogeneous and multidimensional. In this study, foam flow experiments were conducted first in homogeneous sand packs to investigate the effect of surfactant concentration on foam flow and then a heterogeneous experimental setup was prepared to observe heterogeneity and multidimensional flow effects on foam propagation. The homogeneous core experiments were conducted in a cylindrical aluminum core holder that was packed with a uniform Ottawa sand. Sand permeability is about 7.0 Darcy. The experiments were interpreted in terms of evolution of in-situ water saturation as a function of time by the usage of CT scanner, cumulative water, and pressure drop across the core. At very low surfactant concentration, no significant benefit was observed. But when stable foam generation started sweep efficiency (water recovery), breakthrough time, and pressure drop increased as surfactant concentration increased.
Date:
August 9, 1999
Creator:
Apaydin, Osman G.; Bertin, Henri; Castanier, Louis M. & Kovscek, Anthony R.
Object Type:
Report
System:
The UNT Digital Library
Safety and environmental advantages of using tritium-lean targets for inertial fusion
While traditional inertial fusion energy target designs typically use equimolar portions of deuterium and tritium and have areal densities ({rho}r) of {approx} 3 g/cm{sup 2}, significant safety and environmental (S and E) advantages may be obtained through the use of high-density ({rho}r {approx} 10 g/cm{sup 2}) targets with tritium components as low as 0.5%. Such targets would absorb much of the neutron energy within the target and could be self-sufficient from a tritium breeding point of view. Tritium self-sufficiency within the target would free target chamber designers from the need to use lithium-bearing blanket materials, while low inventories within each target would translate into low inventories in target fabrication facilities. Absorption of much of the neutron energy within the target, the extremely low tritium inventories, and the greatly moderated neutron spectrum, make ''tritium-lean'' targets appear quite attractive from an S and E perspective.
Date:
August 9, 1999
Creator:
Arzeni, S.; Latkowski, J. F.; Logan, B. G.; Meier, W. R.; Moir, R. W.; Perkins, L. J. et al.
Object Type:
Article
System:
The UNT Digital Library
Novel Metal-Sulfur-Based Air-Stable Passivation of GaAs with Very Low Surface State Densities
A new air-stable electronic surface passivation for GaAs and other III-V compound semiconductors that employs sulfur and a suitable metal ion, e.g., Zn, and that is robust towards plasma dielectric deposition has been developed. Initial improvements in photoluminescence are twice that of S-only treatments and have been preserved for >11 months with SiO{sub x}N{sub y} dielectric encapsulation. Photoluminescence and X-ray photoelectron spectroscopies indicate that the passivation consists of two major components with one being stable for >2 years in air. This process improves heterojunction bipolar transistor current gain for both large and small area devices.
Date:
August 9, 1999
Creator:
Ashby, Carol I.H.; Baca, Albert G.; Chang, P.-C; Hafich, M.J.; Hammons, B.E. & Zavadil, Kevin R.
Object Type:
Article
System:
The UNT Digital Library
Game.
Patent for a "a game of skill, rather than a game of chance" (lines 11-12), albeit with elements of a game of chance, in the style of a carnival game. The game consists of a motorized, revolving model airplane and a circular arrangement of nets (one for each player); the airplane drops candy into the winning player's net.
Date:
August 9, 1921
Creator:
Auffurth, Erwin, Jr. & Hjerpe, Erick
Object Type:
Patent
System:
The Portal to Texas History
The Debt Limit Since 2011
This report discusses the federal debt limit and the crisis of 2011 in reaching the debt limit. Subsequent developments in extending the debt limit and using extraordinary measures to meet government obligations since then are outlined up to the present.
Date:
August 9, 2017
Creator:
Austin, D. Andrew
Object Type:
Report
System:
The UNT Digital Library
Spent Nuclear Fuel (SNF) Project Final Safety Analysis Report (FSAR)
None
Date:
August 9, 2000
Creator:
BREHM, J.R.
Object Type:
Report
System:
The UNT Digital Library
Microfabrication and Micropatterning with Soft Lithography
None
Date:
August 9, 2000
Creator:
Baca, Justin T. & Myers, Ramona L.
Object Type:
Article
System:
The UNT Digital Library
Black and Hispanic Federal Judges: 1900 to Present
This report shows that in recent years, attention has increasingly focused upon the minority composition of the Federal judiciary, in apparent response to concerns that judges appointed to the Federal bench should more compositely reflect the U.S. population they serve. Two of the larger U.S. subpopulations served by the Federal judiciary are blacks and Hispanics. Accordingly, this mini brief lists chronologically and cumulatively the appointments of blacks and Hispanics to the Federal bench, which includes the U.S.Supreme Court, Circuit Courts of Appeals, and District courts.
Date:
August 9, 1983
Creator:
Bailey, Dorothy J
Object Type:
Report
System:
The UNT Digital Library
Characterization of the DT Ice Layer in a Fusion Capsule Using a Two-Dimensional X-Ray Shearing Interferometer
None
Date:
August 9, 2010
Creator:
Baker, K L
Object Type:
Article
System:
The UNT Digital Library
The Endangered Species Act (ESA), Migratory Bird Treaty Act (MBTA), and Department of Defense (DOD) Readiness Activities: Background and Current Law
This report provides a brief overview of how the Endangered Species Act (ESA)1 and the Migratory Bird Treaty Act (MBTA)2 and their relevant regulations may apply to military training and readiness activities of the Department of Defense (DOD). Military activities may “take” protected creatures directly (e.g,. killing with ordnance during rifle, gunnery or assault drills), or might destroy habitat (e.g., artillery or bombing practices), even if these results are not the purpose of the activities. The applicability of the MBTA and ESA to military readiness activities has been controversial recently and legislation has been enacted in both the 107th and 108th Congresses on these topics.
Date:
August 9, 2004
Creator:
Baldwin, Pamela
Object Type:
Report
System:
The UNT Digital Library
Gravitino Warm Dark Matter with Entropy Production
Gravitinos with a mass in the keV range are an interesting candidate for warm dark matter. Recent measurements of the matter density of the universe and of cosmic structures at the dwarf galaxy scale rule out the simplest gravitino models with thermal freeze-out. We construct a model where the decay of the messenger particles that transmit the supersymmetry breaking to the observable sector generates the required entropy to dilute the gravitino relic density by the required factor of a few to come in line with observations. The model is natural, and requires only that the coupling of the messenger sector to the standard model be set so that the decay happens at the appropriate time.
Date:
August 9, 2001
Creator:
Baltz, Edward A. & Murayama, Hitoshi
Object Type:
Article
System:
The UNT Digital Library