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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
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
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
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
THE IMPACT OF KINETICS ON NEPHELINE FORMATION IN NUCLEAR WASTE GLASSES
Sixteen glass compositions were selected to study the potential impacts of the kinetics of nepheline formation in high-level nuclear waste (HLW) glass. The chosen compositions encompassed a relatively large nepheline discriminator (ND) range, 0.40-0.66, and included a relatively broad range, and amount of, constituents including high aluminum and high boron concentrations. All glasses were fabricated in the laboratory and subsequently exposed to six different cooling treatments. The cooling treatments consisted of three 'stepped' profiles and their corresponding 'smooth' profiles. Included in the cooling treatment was the Defense Waste Processing Facility (DWPF) canister centerline cooling (CCC) profile in addition to a 'faster' and a 'slower' total cooling line. After quenching and heat treating, x-ray diffraction confirmed the type and amount of any resultant crystallization. The target compositions were shown to be consistent with the measured compositions. Two quenched glasses and several treated glasses exhibited minor amounts of spinel and spinel-like phases. Nepheline was not observed in any of the quenched glasses but was observed in many of the treated glasses. The amount of nepheline ranged from approximately 2wt% to 30wt% for samples cooled over shorter times and longer times respectively. Differences were observed in the amount of nepheline crystallization after smooth …
Date:
March 7, 2011
Creator:
Amoroso, J.
Object Type:
Report
System:
The UNT Digital Library
ADDITIVE TESTING FOR IMPROVED SULFUR RETENTION: PRELIMINARY REPORT
The Savannah River National Laboratory is collaborating with Alfred University to evaluate the potential for additives in borosilicate glass to improve sulfur retention. This preliminary report provides further background on the incorporation of sulfur in glass and outlines the experiments that are being performed by the collaborators. A simulated waste glass composition has been selected for the experimental studies. The first phase of experimental work will evaluate the impacts of BaO, PbO, and V{sub 2}O{sub 5} at concentrations of 1.0, 2.0, and 5.0 wt % on sulfate retention in simulated high level waste borosilicate glass. The second phase of experimental work will evaluate the effects of time at the melt temperature on sulfur retention. The resulting samples will be characterized to determine the amount of sulfur remaining as well as to identify the formation of any crystalline phases. The results will be used to guide the future selection of frits and glass forming chemicals in vitrifying Department of Energy wastes containing high sulfur concentrations.
Date:
September 7, 2011
Creator:
Amoroso, J. & Fox, K.
Object Type:
Report
System:
The UNT Digital Library
Compact Linear Accelerator Sources for Gamma-ray Generation
None
Date:
June 7, 2011
Creator:
Anderson, S. G.; Barty, C. P.; Beer, G.; Cross, R. R.; Ebbers, C. A.; Gibson, D. J. et al.
Object Type:
Article
System:
The UNT Digital Library
Angelina & Neches River Authority Annual Financial Report: 2011
Annual financial report of the Angelina & Neches River Authority containing independently-audited financial information for fiscal year 2011, including statements of assets, expenses, revenues, and cash flows, with supplementary notes and information.
Date:
December 7, 2011
Creator:
Angelina & Neches River Authority (Tex.)
Object Type:
Report
System:
The Portal to Texas History
Muslims in Europe: Promoting Integration and Countering Extremism
This report examines policies aimed at promoting integration, combating terrorism, and countering violent extremism in five European countries with significant Muslim populations: France, Germany, the Netherlands, Spain, and the United Kingdom. The report also evaluates the role of the 27-member European Union (EU) in shaping European laws and policies related to integration and counter-radicalization.
Date:
September 7, 2011
Creator:
Archick, Kristin; Belkin, Paul; Blanchard, Christopher M.; Ek, Carl & Mix, Derek E.
Object Type:
Report
System:
The UNT Digital Library
International Criminal Court Cases in Africa: Status and Policy Issues
The International Criminal Court (ICC) has, to date, opened cases exclusively in Sub-Saharan Africa. The Statute of the ICC, also known as the Rome Statute, entered into force on July 1, 2002, and established a permanent, independent Court to investigate and bring to justice individuals who commit war crimes, crimes against humanity, and genocide. As of October 2010, 114 countries-including 31 African countries, the largest regional block-were parties to the Statute. The United States is not a party. This report provides background on current ICC cases and examines issues raised by the ICC's actions in Africa.
Date:
March 7, 2011
Creator:
Arieff, Alexis; Margesson, Rhoda; Browne, Marjorie Ann & Weed, Matthew C.
Object Type:
Report
System:
The UNT Digital Library
The Debt Limit: History and Recent Increases
This report discusses how the total debt of the federal government can increase, an historical overview of debt limits, and how the current economic slowdown has led to higher deficits and thereby a series of debt limit increases, as well as legislation related to these increases.
Date:
March 7, 2011
Creator:
Austin, D. Andrew & Levit, Mindy R.
Object Type:
Report
System:
The UNT Digital Library
Identifying Dark Matter Event Topologies at the LHC
None
Date:
February 7, 2011
Creator:
Bai, Yang; Cheng, Hsin-Chia & /SLAC /UC, Davis
Object Type:
Report
System:
The UNT Digital Library
FINAL–REPORT NO. 2: INDEPENDENT CONFIRMATORY SURVEY SUMMARY AND RESULTS FOR THE ENRICO FERMI ATOMIC POWER PLANT, UNIT 1, NEWPORT, MICHIGAN (DOCKET NO. 50 16; RFTA 10-004)
The Enrico Fermi Atomic Power Plant, Unit 1 (Fermi 1) was a fast breeder reactor design that was cooled by sodium and operated at essentially atmospheric pressure. On May 10, 1963, the Atomic Energy Commission (AEC) granted an operating license, DPR-9, to the Power Reactor Development Company (PRDC), a consortium specifically formed to own and operate a nuclear reactor at the Fermi 1 site. The reactor was designed for a maximum capability of 430 megawatts (MW); however, the maximum reactor power with the first core loading (Core A) was 200 MW. The primary system was filled with sodium in December 1960 and criticality was achieved in August 1963.
Date:
July 7, 2011
Creator:
Bailey, Erika
Object Type:
Report
System:
The UNT Digital Library
The Rambler (Fort Worth, Tex.), Vol. 94, No. 14, Ed. 1 Wednesday, September 7, 2011
Weekly student newspaper from Texas Wesleyan University in Fort Worth, Texas that includes campus and local news along with advertising.
Date:
September 7, 2011
Creator:
Banks, Shauna
Object Type:
Newspaper
System:
The Portal to Texas History
Judicial Discipline Process: An Overview
The first part of this report covers the process for handling complaints against federal judges and judicial discipline, which was enacted on November 2, 2002 as the Judicial Improvements Act of 2002. The second part of this report covers two impeachments during the 111th Congress, those of Judge Samuel B. Kent and Judge G. Thomas Porteous Jr.
Date:
April 7, 2011
Creator:
Barbour, Emily C.
Object Type:
Report
System:
The UNT Digital Library
Mexico's Drug Trafficking Organizations: Source and Scope of the Rising Violence
Report which provides background on drug trafficking in Mexico, identifies the major drug trafficking organizations, and analyzes the context, scope, and scale of the violence. It examines current trends of the violence, analyzes prospects for curbing violence in the future, and compares it with violence in Colombia.
Date:
January 7, 2011
Creator:
Beittel, June S.
Object Type:
Report
System:
The UNT Digital Library
Mexico's Drug Trafficking Organizations: Source and Scope of the Rising Violence
This report provides background on drug trafficking in Mexico, identifies the major drug trafficking organizations, and analyzes the context, scope, and scale of the violence. It examines current trends of the violence, analyzes prospects for curbing violence in the future, and compares it with violence in Colombia.
Date:
September 7, 2011
Creator:
Beittel, June S.
Object Type:
Report
System:
The UNT Digital Library
Charm Spectroscopy from B Factories
A brief review of the excited D{sub s} and D mesons is presented. A precision measurement of the D{sub s1}(2536) mass and width parameters is reported by BABAR. Finally, a recent BABAR study of the D{pi} and D*{pi} final states shows first observations of the radial excitations of the D{sup 0}, D*{sup 0}, and D*{sup +}, as well as the L = 2 excited states of the D{sup 0} and D{sup +}, where L is the orbital angular momentum of the quarks.
Date:
February 7, 2011
Creator:
Benitez, J.
Object Type:
Article
System:
The UNT Digital Library
The National Counterterrorism Center (NCTC)--Responsibilities and Potential Congressional Concerns
This report looks at inadequacies present in the National Counterterrorism Center (NCTC) which prevent the Center from adequately performing its duty. These inadequacies include issues with agency organization, lack of resources, and a focus on threats from Yemen over domestic threats.
Date:
January 7, 2011
Creator:
Best, Richard A., Jr.
Object Type:
Report
System:
The UNT Digital Library
United Nations Reform: U.S. Policy and International Perspectives
This report focuses on U.N. reform efforts and priorities from the perspective of several key actors, including the U.S. government, the U.N. Secretary-General, selected member states, and a cross-section of groups tasked with addressing U.N. reform. It also examines congressional actions related to U.N. reform, as well as future policy considerations.
Date:
July 7, 2011
Creator:
Blanchfield, Luisa
Object Type:
Report
System:
The UNT Digital Library
Direct Probes of Linearly Polarized Gluons inside Unpolarized Hadrons
We show that the unmeasured distribution of linearly polarized gluons inside unpolarized hadrons can be directly probed in jet or heavy quark pair production both in electron-hadron and hadron-hadron collisions. We present expressions for the simplest cos 2{phi} asymmetries and estimate their maximal value in the particular case of electron-hadron collisions. Measurements of the linearly polarized gluon distribution in the proton should be feasible in future EIC or LHeC experiments.
Date:
February 7, 2011
Creator:
Boer, Daniel; Brodsky, Stanley J.; Mulders, Piet J. & Pisano, Cristian
Object Type:
Article
System:
The UNT Digital Library