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Local Effects of Biased Electrodes in the Divertor of NSTX
The goal of this paper is to characterize the effects of small non-axisymmetric divertor plate electrodes on the local scrape-off layer plasma. Four small rectangular electrodes were installed into the outer divertor plates of NSTX. When the electrodes were located near the outer divertor strike point and biased positively, there was an increase in the nearby probe currents and probe potentials and an increase in the LiI light emission at the large major radius end of these electrodes. When an electrode located farther outward from the outer divertor strike point was biased positively, there was sometimes a significant decrease in the LiI light emission at the small major radius end of this electrode, but there were no clear effects on the nearby probes. No non-local effects were observed with the biasing of these electrodes.
Date:
May 7, 2012
Creator:
: S. Zweben, M.D. Campanell, B.C. Lyons, R.J. Maqueda, Y. Raitses, A.L. Roquemore and F. Scotti
Object Type:
Report
System:
The UNT Digital Library
GLASS FORMULATION TESTING TO INCREASE SULFATE INCORPORATION - Final Report VSL-04R4960-1, Rev 0, 2/28/05, Vitreous State Laboratory, The Catholic University of American, Washington, D.C.
About 50 million gallons of high-level mixed waste is currently in storage in underground tanks at The United States Department of Energy's (DOE's) Hanford site in the State of Washington. The Hanford Tank Waste Treatment and Immobilization Plant (WTP) will provide DOE's Office of River Protection (ORP) with a means of treating this waste by vitrification for subsequent disposal. The tank waste will be separated into low- and high-activity fractions, which will then be vitrified respectively into Immobilized Low Activity Waste (ILAW) and Immobilized High Level Waste (IHLW) products. The ILAW product will be disposed of in an engineered facility on the Hanford site while the IHLW product will be directed to the national deep geological disposal facility for high-level nuclear waste. The ILAW and IHLW products must meet a variety of requirements with respect to protection of the environment before they can be accepted for disposal. The Office of River Protection is currently examining options to optimize the Low Activity Waste (LAW) facility and the LAW glass waste form. One option under evaluation is to enhance the waste processing rate of the vitrification plant currently under construction. It is likely that the capacity of the LAW vitrification plant can …
Date:
February 7, 2012
Creator:
AA, KRUGER & KS, MATLACK
Object Type:
Report
System:
The UNT Digital Library
SMALL-SCALE MELTER TESTING WITH LAW SIMULANTS TO ASSESS THE IMPACT OF HIGHER TEMPERATURE MELTER OPERATIONS - Final Report, VSL-04R49801-1, Rev. 0, 2/13/03, Vitreous State Laboratory, The Catholic University of America, Washington, D.C.
About 50 million gallons of high-level mixed waste is currently in storage in underground tanks at The United States Department of Energy's (DOE's) Hanford site in the State of Washington. The Hanford Tank Waste Treatment and Immobilization Plant (WTP) will provide DOE's Office of River Protection (ORP) with a means of treating this waste by vitrification for subsequent disposal. The tank waste will be separated into low- and high-activity fractions, which will then be vitrified respectively into Immobilized Low Activity Waste (ILAW) and Immobilized High Level Waste (IHLW) products. The ILAW product will be disposed of in an engineered facility on the Hanford site while the IHL W product will be directed to the national deep geological disposal facility for high-level nuclear waste. The ILAW and IHLW products must meet a variety of requirements with respect to protection of the environment before they can be accepted for disposal. The Office of River Protection is currently examining options to optimize the Low Activity Waste (LAW) facility and the LAW glass waste form. One option under evaluation is to enhance the waste processing rate of the vitrification plant currently under construction. It is likely that the capacity of the LAW vitrification plant …
Date:
February 7, 2012
Creator:
AA, KRUGER & KS, MATLACK
Object Type:
Report
System:
The UNT Digital Library
EFFECT OF GLASS-BATCH MAKEUP ON THE MELTING PROCESS
The response of a glass batch to heating is determined by the batch makeup and in turn determines the rate of melting. Batches formulated for a high-alumina nuclear waste to be vitrified in an all-electric melter were heated at a constant temperature-increase rate to determine changes in melting behavior in response to the selection of batch chemicals and silica grain-size as well as the addition of heat-generating reactants. The type of batch materials and the size of silica grains determine how much, if any, primary foam occurs during melting. Small quartz grains, 5 {micro}m in size, caused extensive foaming because their major portion dissolved at temperatures <800 C, contributing to the formation of viscous glass forming melt that trapped evolving batch gases. Primary foam did not occur in batches with larger quartz grains, {+-}75 {micro}m in size, because their major portion dissolved at temperatures >800 C when batch gases no longer evolved. The exothermal reaction of nitrates with sucrose was ignited at a temperature as low as 160 C and caused a temporary jump in temperature of several hundred degrees. Secondary foam, the source of which is oxygen from redox reactions, occurred in all batches of a limited composition variation …
Date:
December 7, 2010
Creator:
AA, KRUGER & P, HRMA
Object Type:
Article
System:
The UNT Digital Library
GLASSES CONTAINING IRON (II III) OXIDES FOR IMMOBILIZATION OF RADIOACTIVE TECHNETIUM
Technetium-99 (Tc-99) has posed serious environmental threats as US Department of Energy's high-level waste. This work reports the vitrification of Re, as surrogate for Tc-99, by iron-borosilicate and iron-phosphate glasses, respectively. Iron-phosphate glasses can dissolve Re as high as {approx} 1.2 wt. %, which can become candidate waste forms for Tc-99 disposal, while borosilicate glasses can retain less than 0.1 wt. % of Re due to high melting temperature and long melting duration. Vitrification of Re as Tc-99's mimic was investigated using iron-borosilicate and iron-phosphate glasses. The retention of Re in borosilicate glasses was less than 0.1 wt. % and more than 99 wt. % of Re were volatilized due to high melting temperature and long melting duration. Because the retention of Re in iron-phosphate glasses is as high as 1.2 wt. % and the volatilization is reduced down to {approx}50 wt. %, iron-phosphate glasses can be one of the glass waste form candidates for Tc (or Re) disposal. The investigations of chemical durability and leaching test of iron-phosphate glasses containing Re are now underway to test the performance of the waste form.
Date:
November 7, 2011
Creator:
AA, KRUGER; J, HEO; K, XU; JK, CHOI; PR, HRMA & W, UM
Object Type:
Article
System:
The UNT Digital Library
EVALUATION OF TEMPORAL VARIATIONS IN HYDRAULIC CAPTURE DUE TO CHANGING FLOW PATTERNS USING MAPPING AND MODELING TECHNIQUES
Robust performance evaluation represents one of the most challenging aspects of groundwater pump-and-treat (P&T) remedy implementation. In most cases, the primary goal of the P&T system is hydraulic containment, and ultimately recovery, of contaminants to protect downgradient receptors. Estimating the extent of hydraulic containment is particularly challenging under changing flow patterns due to variable pumping, boundaries and/or other conditions. We present a systematic approach to estimate hydraulic containment using multiple lines of evidence based on (a) water-level mapping and (b) groundwater modeling. Capture Frequency Maps (CFMs) are developed by particle tracking on water-level maps developed for each available water level data set using universal kriging. In a similar manner, Capture Efficiency Maps (CEMs) are developed by particle tracking on water-levels calculated using a transient groundwater flow model: tracking is undertaken independently for each stress period using a very low effective porosity, depicting the 'instantaneous' fate of each particle each stress period. Although conceptually similar, the two methods differ in their underlying assumptions and their limitations: their use together identifies areas where containment may be reliable (i.e., where the methods are in agreement) and where containment is uncertain (typically, where the methods disagree). A field-scale example is presented to illustrate these …
Date:
April 7, 2011
Creator:
AA, SPILIOTOPOULOS; LC, SWANSON; R, SHANNON & MJ, TONKIN
Object Type:
Article
System:
The UNT Digital Library
Search for Contact Interactions in Dimuon Events From $Pp$ Collisions at $\sqrt{s}=7$ TeV With the ATLAS Detector
None
Date:
June 7, 2013
Creator:
Aad, Georges
Object Type:
Article
System:
The UNT Digital Library
Search for Extra Dimensions Using Diphoton Events in 7 TeV Proton-Proton Collisions with the ATLAS Detector
None
Date:
May 7, 2013
Creator:
Aad, Georges
Object Type:
Article
System:
The UNT Digital Library
Oral History Interview with Richard Abalos, July 7, 2016
Richard C. Abalos grew up in Rankin, Texas. After graduating early from high school, Abalos moved to Odessa, Texas where he attended Odessa College and worked for a law form as an investigator and aide. Before obtaining an undergraduate degree, Abalos entered law school at St. Mary’s University in San Antono, Texas. After law school, he was drafted into the military. Upon returning to Odessa, he became the city’s first Mexican American attorney and handled several civil rights cases, including the nationally recognized Larry Lozano police beating that galvanized the region’s Chicano Movement.
Date:
July 7, 2016
Creator:
Abalos, Richard; Wisely, Karen & Zapata, Joel
Object Type:
Video
System:
The Portal to Texas History
Fermi Observations of the Very Hard Gamma-Ray Blazar PG 1553+113
None
Date:
December 7, 2011
Creator:
Abdo, A. A.
Object Type:
Article
System:
The UNT Digital Library
Doctoral Recital: 2014-04-07 - Shoko Abe, collaborative piano
Recital presented at the UNT College of Music Recital Hall in partial fulfillment of the Doctor of Musical Arts (DMA) degree.
Date:
April 7, 2014
Creator:
Abe, Shoko
Object Type:
Sound
System:
The UNT Digital Library
A Method of Optimizing Field Roll-Off and the Peak Field of Hybrid Planar Undulators
None
Date:
October 7, 2013
Creator:
Abliz, M. & Vasserman, I. (Accelerator Systems Division (APS)) Accelerator Systems Division (APS)
Object Type:
Report
System:
The UNT Digital Library
Hard Probes in Heavy Ion Collisions at the LHC: PDFs, Shadowing and $pA$ Collisions
None
Date:
August 7, 2013
Creator:
Accardi, Alberto; Armesto, N.; Botje, M.; Brodsky, S. J.; Cole, B.; Eskola, K. J. et al.
Object Type:
Article
System:
The UNT Digital Library
Commentary on "Effect of β-alanine and the solvent composition on the solubility of solvate of calcium D-pantothenate containing four molecules of methanol and one molecule of water (D-PC·4MeOH·1H₂O)"
This article points out problems associated with two of the mathematical treatments used by authors Han et al. (2017) for the solubility behavior of calcium D-panthenate solvate as the mole fraction concentration β-alanine approaches zero.
Date:
February 7, 2017
Creator:
Acree, William E. (William Eugene)
Object Type:
Article
System:
The UNT Digital Library
Comments on "Role of Anions (Tetrafluoroborate, Perchlorate) of Tetrabutylammonium Salts in Determining Solvation Effects Prevailing in Industrially Essential Solvents Probed by Conductance and FT-IR Spectra"
Article commenting on "Role of Anions (tetrafluoroborate, perchlorate) of tetrabutylammonium salts in determining solvation effects prevailing in industrially essential solvents probed by conductance and FT-IR spectra.
Date:
March 7, 2014
Creator:
Acree, William E. (William Eugene)
Object Type:
Article
System:
The UNT Digital Library
Comment on "Measurement and correlation of the solubility of p-coumaric acid in nine pure and water + ethanol mixed solvents at temperatures from 293.15 to 333.15 K"
This article provides comments on the article "Measurement and correlation of the solubility of p-coumaric acid in nine pure and water + ethanol mixed solvents at temperatures from 293.15 to 333.15 K" published in the Journal of Chemical and Engineering Data in 2016.
Date:
December 7, 2016
Creator:
Acree, William E. (William Eugene); Barrera, Maribel & Abraham, M. H. (Michael H.)
Object Type:
Article
System:
The UNT Digital Library
Oral History Interview with Nick Jimenez, June 7, 2016
Mr. Jimenez provides an overview of Corpus Christi history, the newspaper business, and politics.
Date:
June 7, 2016
Creator:
Acuña-Gurrola, Moisés; Wall, James & Jimenez, Nick
Object Type:
Video
System:
The Portal to Texas History
Oral History Interview with Larry Running Turtle Salazar, June 7, 2016
Salazar discusses his personal history and Native American Activism.
Date:
June 7, 2016
Creator:
Acuña-Gurrola, Moisés; Wall, James & Salazar, Larry Running Turtle
Object Type:
Video
System:
The Portal to Texas History
International Trade and Finance: Key Policy Issues for the 112th Congress
This report highlights major international trade and finance issues Congress may address this year.
Date:
January 7, 2011
Creator:
Ahearn, Raymond J.
Object Type:
Report
System:
The UNT Digital Library
International Trade and Finance: Key Policy Issues for the 112th Congress
This report examines the trade relations between the United States, the European Union, and China.
Date:
January 7, 2011
Creator:
Ahearn, Raymond J.
Object Type:
Report
System:
The UNT Digital Library
Transatlantic Regulatory Cooperation: Background and Analysis
This report discusses commercial ties between the United States and the 27-member European Union. These ties are substantial, growing, and mutually beneficial, but differences in regulatory approaches limit an even more integrated marketplace from developing. This report is intended to serve as an introduction and primer on this complicated, broad, and often highly technical set of issues.
Date:
March 7, 2011
Creator:
Ahearn, Raymond J.
Object Type:
Report
System:
The UNT Digital Library
Evaluation of Three Major Emission Sources on DFW Ozone Level Using Photochemical Modeling
Poster for the 2015 University of North Texas (UNT) Graduate Exhibition. This poster discusses the evaluation of three major emission sources on the Dallas-Fort Worth ozone levels using photochemical modeling.
Date:
March 7, 2015
Creator:
Ahmadi, Mahdi & John, Kuruvilla
Object Type:
Poster
System:
The UNT Digital Library
Exploratory User Research for Computational Resource for South Asian Languages
Report for the project, Exploratory User Research for CoRSAL, which was an exploratory ethnographic study to generate a foundational understanding of how different user groups might use a planned language archive for South Asian languages. Their research project was to be used by the CoRSAL team to help plan the design of CoRSAL’s infrastructure, and laid the groundwork for further studies that will take a deeper look at issues surrounding the design and use of the planned language archive.
Date:
December 7, 2016
Creator:
Al Smadi, Duha; Barnes, Sebastian; Blair, Molly; Chong, Miyoung; Cole-Jett, Robin; Davis, Aaron et al.
Object Type:
Report
System:
The UNT Digital Library
Electronic Structure of Ligated CdSe Clusters: Dependence on DFT Methodology
Simulations of ligated semiconductor quantum dots (QDs) and their physical properties, such as morphologies, QD-ligand interactions, electronic structures, and optical transitions, are expected to be very sensitive to computational methodology. We utilize Density Functional Theory (DFT) and systematically study how the choice of density functional, atom-localized basis set, and a solvent affects the physical properties of the Cd{sub 33}Se{sub 33} cluster ligated with a trimethyl phosphine oxide ligand. We have found that qualitative performance of all exchange-correlation (XC) functionals is relatively similar in predicting strong QD-ligand binding energy ({approx}1 eV). Additionally, all functionals predict shorter Cd-Se bond lengths on the QD surface than in its core, revealing the nature and degree of QD surface reconstruction. For proper modeling of geometries and QD-ligand interactions, however, augmentation of even a moderately sized basis set with polarization functions (e.g., LANL2DZ* and 6-31G*) is very important. A polar solvent has very significant implications for the ligand binding energy, decreasing it to 0.2-0.5 eV. However, the solvent model has a minor effect on the optoelectronic properties, resulting in persistent blue shifts up to {approx}0.3 eV of the low-energy optical transitions. For obtaining reasonable energy gaps and optical transition energies, hybrid XC functionals augmented by a …
Date:
July 7, 2011
Creator:
Albert, VV; Ivanov, SA; Tretiak, S & Kilina, SV
Object Type:
Article
System:
The UNT Digital Library