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342
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Design and Development of Selective Extractants for An/Ln Separations
This study has succeeded in further developing phosphinoylmethyl pyridine compounds as selective recognition and separations agents for trivalent lanthanide and actinide ions present in nuclear materials. The parameters for efficient separations have been further elucidated and factors important to further development have been identified. Further development will lead to optimal extractant design for effective actinide ion partitioning under process practical conditions. The primary objective of the project involved the design, synthesis, and characterization of the extraction performance of 2,6-bis(phosphinomethyl)pyridine N,P,P{prime}-trioxides (NOPOPO) as potential reagents for the separation of Am, Cm, and fission product lanthanides from other transuranics and fission products and for acting as a separations 'platform' for the mutual separation of Am/Cm from the lanthanides. The secondary but critical objective of the project focused on the characterization of aqueous acid and radiation stability of NOPOPO ligands. Further, the project served as a interdisciplinary training vehicle for new, young investigators in actinide separations chemistry.
Date:
December 4, 2009
Creator:
Paine, Robert T.
Object Type:
Report
System:
The UNT Digital Library
Durable Glass for Thousands of Years
The durability of natural glasses on geological time scales and ancient glasses for thousands of years is well documented. The necessity to predict the durability of high level nuclear waste (HLW) glasses on extended time scales has led to various thermodynamic and kinetic approaches. Advances in the measurement of medium range order (MRO) in glasses has led to the understanding that the molecular structure of a glass, and thus the glass composition, controls the glass durability by establishing the distribution of ion exchange sites, hydrolysis sites, and the access of water to those sites. During the early stages of glass dissolution, a 'gel' layer resembling a membrane forms through which ions exchange between the glass and the leachant. The hydrated gel layer exhibits acid/base properties which are manifested as the pH dependence of the thickness and nature of the gel layer. The gel layer ages into clay or zeolite minerals by Ostwald ripening. Zeolite mineral assemblages (higher pH and Al{sup 3+} rich glasses) may cause the dissolution rate to increase which is undesirable for long-term performance of glass in the environment. Thermodynamic and structural approaches to the prediction of glass durability are compared versus Ostwald ripening.
Date:
December 4, 2009
Creator:
Jantzen, Carol M.; Brown, Kevin G. & Pickett, J. B.
Object Type:
Article
System:
The UNT Digital Library
The Endangered Species Act (ESA) in the 111th Congress: Conflicting Values and Difficult Choices
The Endangered Species Act has been one of the more contentious environmental laws. This may stem from its strict substantive provisions, which can affect the use of both federal and nonfederal lands and resources. This report discusses oversight issues and legislation introduced in the 11th Congress to address Endangered Species Act implementation and management of endangered and threatened species.
Date:
December 4, 2009
Creator:
Buck, Eugene H.; Corn, M. Lynne; Sheikh, Pervaze A.; Meltz, Robert & Alexander, Kristina
Object Type:
Report
System:
The UNT Digital Library
An Experimental and Kinetic Modeling Study of Methyl Decanoate Combustion
Biodiesel is a mixture of long chain fatty acid methyl esters derived from fats and oils. This research study presents opposed-flow diffusion flame data for one large fatty acid methyl ester, methyl decanoate, and uses the experiments to validate an improved skeletal mechanism consisting of 648 species and 2998 reactions. The results indicate that methyl decanoate is consumed via abstraction of hydrogen atoms to produce fuel radicals, which lead to the production of alkenes. The ester moiety in methyl decanoate leads to the formation of low molecular weight oxygenated compounds such as carbon monoxide, formaldehyde, and ketene.
Date:
December 4, 2009
Creator:
Sarathy, S M; Thomson, M J; Pitz, W J & Lu, T
Object Type:
Article
System:
The UNT Digital Library
Financial Management Systems: DHS Faces Challenges to Successfully Consolidating Its Existing Disparate Systems
A letter report issued by the Government Accountability Office with an abstract that begins "In June 2007, GAO reported that the Department of Homeland Security (DHS) had made little progress in integrating its existing financial management systems and made six recommendations focused on the need for DHS to define a departmentwide strategy and embrace disciplined processes. In June 2007, DHS announced its new financial management systems strategy, called the Transformation and Systems Consolidation (TASC) program. House Report No. 110-862 directed GAO to determine whether DHS had implemented GAO's prior recommendations. GAO also assessed whether there were additional issues that pose unnecessary risks to the successful implementation of the TASC program. GAO reviewed relevant documentation, such as the January 2009 request for proposal and its attachments, and interviewed key officials to obtain additional information."
Date:
December 4, 2009
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
Gangs in Central America
This report describes the gang problem in Central America, discusses country and regional approaches to deal with the gangs, and analyzes U.S. policy with respect to gangs in Central America.
Date:
December 4, 2009
Creator:
Seelke, Clare Ribando
Object Type:
Report
System:
The UNT Digital Library
Material Needs for Thin-Film and Concentrator Photovoltaic Modules
This presentation describes the ongoing needs (manufacturability, availability, low cost, performance, and reliability) that drive the development of new photovoltaic materials.
Date:
December 4, 2009
Creator:
Kurtz, S.
Object Type:
Presentation
System:
The UNT Digital Library
Medicare Program Changes in the Senate Amendment in the Nature of a Substitute to H.R. 3590
None
Date:
December 4, 2009
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Metal Angle Correction in the Cylinder Test
None
Date:
December 4, 2009
Creator:
Souers, P. C.; Garza, R.; Hornig, H.; Lauderbach, L.; Owens, C. & Vitello, P.
Object Type:
Article
System:
The UNT Digital Library
NANOSTRUCTURED METAL OXIDES FOR ANODES OF LI-ION RECHARGEABLE BATTERIES
The aligned nanorods of Co{sub 3}O{sub 4} and nanoporous hollow spheres (NHS) of SnO{sub 2} and Mn{sub 2}O{sub 3} were investigated as the anodes for Li-ion rechargeable batteries. The Co{sub 3}O{sub 4} nanorods demonstrated 1433 mAh/g reversible capacity. The NHS of SnO{sub 2} and Mn{sub 2}O{sub 3} delivered 400 mAh/g and 250 mAh/g capacities respectively in multiple galvonastatic discharge-charge cycles. It was found that high capacity of NHS of metal oxides is sustainable attributed to their unique structure that maintains material integrity during cycling. The nanostructured metal oxides exhibit great potential as the new anode materials for Li-ion rechargeable batteries with high energy density, low cost and inherent safety.
Date:
December 4, 2009
Creator:
Au, M.
Object Type:
Article
System:
The UNT Digital Library
Nuclear quantum effects in the structure and lineshapes of the N2 NEXAFS spectrum
We study the relative ability of several models of the X-ray absorption spectrum to capture the Franck-Condon structure apparent from an experiment on gaseous nitrogen. In doing so, we adopt the Born-Oppenheimer approximation and a constrained density functional theory method for computing the energies of the X-ray-excited molecule. Starting from an otherwise classical model for the spectrum, we systematically introduce more realistic physics, first by substituting the quantum mechanical nuclear radial density in the bond separation R for the classical radial density, then by adding the effect of zero-point energy and other level shifts, and finally by including explicit rovibrational quantization of both the ground and excited states. The quantization is determined exactly, using a discrete variable representation. We show that the NEXAFS spectrum can be predicted semiquantiatively within this framework. We also address the possibility of non-trivial temperature dependence in the spectrum. Finally, we show that it is possible to improve the predicted spectrum by using constrained DFT in combination with more accurate potentials.
Date:
December 4, 2009
Creator:
Fatehi, Shervin; Schwartz, Craig P.; Saykally, Richard J. & Prendergast, David
Object Type:
Article
System:
The UNT Digital Library
PEP Run Report for Integrated Test A, Caustic Leaching in UFP-VSL-T01A, Oxidative Leaching in UFP-VSL-T02A
Pacific Northwest National Laboratory (PNNL) was tasked by Bechtel National Inc. (BNI) on the River Protection Project-Hanford Tank Waste Treatment and Immobilization Plant (RPP-WTP) project to perform research and development activities to resolve technical issues identified for the Pretreatment Facility (PTF). The Pretreatment Engineering Platform (PEP) was designed and constructed and operated as part of a plan to respond to issue M12, “Undemonstrated Leaching Processes.”(a) The PEP, located in the Process Engineering Laboratory-West (PDLW) located in Richland, Washington, is a 1/4.5-scale test platform designed to simulate the WTP pretreatment caustic leaching, oxidative leaching, ultrafiltration solids concentration, and slurry washing processes. The PEP replicates the WTP leaching processes using prototypic equipment and control strategies. The PEP also includes non-prototypic ancillary equipment to support the core processing.
Date:
December 4, 2009
Creator:
Guzman-Leong, Consuelo E.; Bredt, Ofelia P.; Burns, Carolyn A.; Daniel, Richard C.; Su, Yin-Fong; Geeting, John GH et al.
Object Type:
Report
System:
The UNT Digital Library
Proceedings of the 25th Rare Earth Research Conference, June 22-26, Tuscaloosa, Alabama, USA Journal of Alloys and Compounds 2009, Vol. 488, Iss. 2, pp 491-656
The program of the 25th Rare Earth Research Conference (RERC08) integrated basic and applied multidisciplinary research centered on the f-elements. Leading science was featured in the form of invited oral presentations and contributed posters on topics in f-element chemistry, physics, and material, earth, environmental, and biological sciences. The conference was held in Shelby Hall, located on The University of Alabama?s Tuscaloosa, AL campus. The final program and list of attendees is available at URL http://bama.ua.edu/~rdrogers/RERC08/.
Date:
December 4, 2009
Creator:
Rogers, Robin D.
Object Type:
Article
System:
The UNT Digital Library
quantifying and Predicting Reactive Transport
This project was led by Dr. Jiamin Wan at Lawrence Berkeley National Laboratory. Peter Burns provided expertise in uranium mineralogy and in identification of uranium minerals in test materials. Dr. Wan conducted column tests regarding uranium transport at LBNL, and samples of the resulting columns were sent to Dr. Burns for analysis. Samples were analyzed for uranium mineralogy by X-ray powder diffraction and by scanning electron microscopy, and results were provided to Dr. Wan for inclusion in the modeling effort. Full details of the project can be found in Dr. Wan's final reports for the associated effort at LBNL.
Date:
December 4, 2009
Creator:
Burns, Peter C.
Object Type:
Report
System:
The UNT Digital Library
Scientific/Technical Report Bioenergetics Research Initiative Award number-DE-FG02-05ER64092
General Project Overview and Final Technical Report This equipment grant was utilized to enhance the infrastructure of the Human Performance Laboratory at Ball State University. The laboratories primary focus is human based exercise physiology conducting research in the areas of sports performance, aging and exercise, unloading (space flight and bed rest), pediatric exercise and clinical exercise physiology. The main equipment supported by this grant was an ultrasound unit for cardiac and skeletal muscle imaging at the whole organ level, microscope system for micro imaging of skeletal muscle tissue, running treadmill for energy expenditure assessment, autoclave for sterilization, and upgrade to our dual x‐ray absorptiometry (DEXA) system that was utilized for body composition measurements. The equipment was involved in several human metabolic and skeletal muscle research projects as highlighted above. In particular, this equipment served a support role for other large‐scale clinical projects funded by the National Institutes of Health (NIH), National Aeronautics and Space Administration (NASA), and corporate sponsors.
Date:
December 4, 2009
Creator:
Trappe, Scott A.
Object Type:
Report
System:
The UNT Digital Library
Studies of SmCo5/Fe nanocomposite magnetic bilayers with magnetic soft x-ray transmission microscopy
A hard/soft SmCo{sub 5}/Fe nanocomposite magnetic bilayer system has been fabricated on X-ray transparent 100-200 nm thin Si{sub 3}N{sub 4} membranes by magnetron sputtering. The microscopic magnetic domain pattern and its behavior during magnetization reversal in the hard and soft magnetic phases have been individually studied by element specific magnetic soft x-ray microscopy at a spatial resolution of better than 25nm. We observe that the domain patterns for soft and hard phases switch coherently throughout the full hysteresis cycle upon applying external magnetic fields. We derived local M(H) curves from the images for Fe and SmCo5 separately and found switching for both hard and soft phases same.
Date:
December 4, 2009
Creator:
Shahzad, F.; Siddiqi, S. A.; Im, M.-Y.; Avallone, A.; Fischer, P.; Hussain, Z. et al.
Object Type:
Article
System:
The UNT Digital Library
Texas Register, Volume 34, Number 49, Pages 8581-8902, December 4, 2009
A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.
Date:
December 4, 2009
Creator:
Texas. Secretary of State.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
TMTI Task 1.6 Genetic Engineering Methods and Detection
A large number of GE techniques can be adapted from other microorganisms to biothreat bacteria and viruses. Detection of GE in a microorganism increases in difficulty as the size of the genetic change decreases. In addition to the size of the engineered change, the consensus genomic sequence of the microorganism can impact the difficulty of detecting an engineered change in genomes that are highly variable from strain to strain. This problem will require comprehensive databases of whole genome sequences for more genetically variable biothreat bacteria and viruses. Preliminary work with microarrays for detecting synthetic elements or virulence genes and analytic bioinformatic approaches for whole genome sequence comparison to detect genetic engineering show promise for attacking this difficult problem but a large amount of future work remains.
Date:
December 4, 2009
Creator:
Slezak, T.; Lenhoff, R.; Allen, J.; Borucki, M.; Vitalis, E. & Gardner, S.
Object Type:
Report
System:
The UNT Digital Library
U.S. Foreign Aid to Israel
This report provides an overview of U.S. foreign assistance to Israel. It includes a review of past aid programs, data on annual assistance, and an analysis of current issues.
Date:
December 4, 2009
Creator:
Sharp, Jeremy M.
Object Type:
Report
System:
The UNT Digital Library
United Nations System Funding: Congressional Issues
This report tracks the process by which Congress provides the funding for U.S. assessed contributions to the regular budgets of the United Nations, its agencies, and U.N. peacekeeping operation accounts, as well as for U.S. voluntary contributions to U.N. system programs and funds. It includes information on the President's request and the congressional response, as well as congressional initiatives during this legislative process. Basic information is provided to help the reader understand this process.
Date:
December 4, 2009
Creator:
Browne, Marjorie Ann & Nakamura, Kennon H.
Object Type:
Report
System:
The UNT Digital Library
22nd NREL Industry Growth Forum Opening Remarks - Day 2
A presentation at the 22nd Industry Growth Forum by Tod Perry that provides information and statistics about the presenting companies.
Date:
November 4, 2009
Creator:
Perry, T.
Object Type:
Presentation
System:
The UNT Digital Library
The Child Abuse Prevention and Treatment Act (CAPTA): Background, Programs, and Funding
This report begins with discussion of the issue and scope of child abuse and neglect, followed by a discussion of the manner and scope of the work of the child protective services (CPS) agency in receiving and responding to allegations of child abuse or neglect, and then looks at some identified risk factors for poor child and family outcomes among all children in families investigated for abuse or neglect.
Date:
November 4, 2009
Creator:
Stoltzfus, Emilie
Object Type:
Report
System:
The UNT Digital Library
Climate Change: EU and Proposed U.S. Approaches to Carbon Leakage and WTO Implications
This report discusses climate change and issues related to carbon leakage by examining the European Union's (EU's) cap-and-trade program with a review and analysis of various EU efforts to address the concerns of energy-intensive, trade-exposed industries. Additionally, it considers similar provisions enacted or proposed by the U.S. and analyzes potential World Trade Organization (WTO) implications in relation to U.S. trade agreements.
Date:
November 4, 2009
Creator:
Parker, Larry & Grimmett, Jeanne J.
Object Type:
Report
System:
The UNT Digital Library
Consumers and Food Price Inflation
The heightened commodity price volatility of 2008 and the subsequent acceleration in U.S. food price inflation raised concerns and generated many questions about farm and food price movements by Members of Congress and their constituents. This report responds to those concerns by addressing the nature and measurement of retail food price inflation.
Date:
November 4, 2009
Creator:
Schnepf, Randy & Richardson, Joe
Object Type:
Report
System:
The UNT Digital Library