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3,417 Matching Results
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The adaptive x-ray optics project at the Lawrence Livermore National Laboratory
None
Date:
June 25, 2013
Creator:
Pardini, T; Poyneer, L A; McCarville, T J; Macintosh, B; Bauman, B & Pivovaroff, M J
Object Type:
Article
System:
The UNT Digital Library
DWPF simulant CPC studies for SB8
The Savannah River National Laboratory (SRNL) accepted a technical task request (TTR) from Waste Solidification Engineering to perform simulant tests to support the qualification of Sludge Batch 8 (SB8) and to develop the flowsheet for SB8 in the Defense Waste Processing Facility (DWPF). These efforts pertained to the DWPF Chemical Process Cell (CPC). Separate studies were conducted for frit development and glass properties (including REDOX). The SRNL CPC effort had two primary phases divided by the decision to drop Tank 12 from the SB8 constituents. This report focuses on the second phase with SB8 compositions that do not contain the Tank 12 piece. A separate report will document the initial phase of SB8 testing that included Tank 12. The second phase of SB8 studies consisted of two sets of CPC studies. The first study involved CPC testing of an SB8 simulant for Tank 51 to support the CPC demonstration of the washed Tank 51 qualification sample in the SRNL Shielded Cells facility. SB8-Tank 51 was a high iron-low aluminum waste with fairly high mercury and moderate noble metal concentrations. Tank 51 was ultimately washed to about 1.5 M sodium which is the highest wash endpoint since SB3-Tank 51. This study …
Date:
June 25, 2013
Creator:
Koopman, D. C. & Zamecnik, J. R.
Object Type:
Report
System:
The UNT Digital Library
Progress in Developing the STFNSF Configuration
The design features developed for the Spherical Tokamak (ST) in the PPPL pilot plant study was used as the starting point in developing designs to meet the mission of a Fusion Nuclear Science Facility (FNSF) considering a range of machine sizes based on the influence of tritium consumption and maintenance strategies. The compact nature of a steady state operated ST device for this mission pushes operating conditions and places challenges in the design of components, device maintenance and the integration of supports and services. This paper reviews the general arrangement, design details and maintenance strategy of the ST-FNSF device core for a 1.6-m and 1.0-m device; operating points which bracket the region between purchasing and breeding tritium.
Date:
June 25, 2013
Creator:
Brown, Thomas
Object Type:
Article
System:
The UNT Digital Library
Reducing the Cost of Thermal Energy Storage for Parabolic Trough Solar Power Plants
Thermal energy storage systems using phase change materials were evaluated for trough systems that use oil, steam, and high temperature salts as heat transfer fluids. A variety of eutectic salts and metal alloys were considered as phase change materials in a cascaded arrangement. Literature values of specific heat, latent heat, density, and other thermophysical properties were used in initial analyses. Testing laboratories were contracted to measure properties for candidate materials for comparison to the literature and for updating the models. A TRNSYS model from Phase 1 was further developed for optimizing the system, including a novel control algorithm. A concept for increasing the bulk thermal conductivity of the phase change system was developed using expanded metal sheets. Outside companies were contracted to design and cost systems using platecoil heat exchangers immersed in the phase change material. Laboratory evaluations of the one-dimensional and three-dimensional behavior of expanded metal sheets in a low conductivity medium were used to optimize the amount of thermal conductivity enhancement. The thermal energy storage systems were compared to baseline conventional systems. The best phase change system found in this project, which was for the high temperature plant, had a projected cost of $25.2 per kWhth, The best …
Date:
June 25, 2013
Creator:
Gawlik, Keith
Object Type:
Report
System:
The UNT Digital Library
Caldwell Ranch Exploration and Confirmation Project, Northwest Geysers, CA
The purpose of the Caldwell Ranch Exploration and Confirmation Project was to drill, test, and confirm the present economic viability of the undeveloped geothermal reservoir in the 870 acre Caldwell Ranch area of the Northwest Geysers that included the CCPA No.1 steam field. All of the drilling, logging, and sampling challenges were met. � Three abandoned wells, Prati 5, Prati 14 and Prati 38 were re-opened and recompleted to nominal depths of 10,000 feet in 2010. Two of the wells required sidetracking. � The flow tests indicated Prati 5 Sidetrack 1 (P-5 St1), Prati 14 (P-14) and Prati 38 Sidetrack 2 (P-38 St2) were collectively capable of initially producing an equivalent of 12 megawatts (MWe) of steam using a conversion rate of 19,000 pounds of steam/hour
Date:
April 25, 2013
Creator:
Walters, Mark A.
Object Type:
Report
System:
The UNT Digital Library
Cosmography From Two-Image Lens Systems: Overcoming the Lens Profile Slope Degeneracy
None
Date:
April 25, 2013
Creator:
Suyu, S.H. & /UC, Santa Barbara /KIPAC, Menlo Park
Object Type:
Article
System:
The UNT Digital Library
Deflection of MeV Electrons by Self-Generated Magnetic Fields in Intense Laser-Solid Interaction
None
Date:
April 25, 2013
Creator:
Perez, F.; Kemp, A. J.; Divol, L.; Chen, C. D. & Patel, P. K.
Object Type:
Article
System:
The UNT Digital Library
Dissecting the Gravitational Lens B1608 656. I. Lens Potential Reconstruction
None
Date:
April 25, 2013
Creator:
Suyu, S. H.; Marshall, P. J.; Blandford, R. D.; Fassnacht, C. D.; Koopmans, L. V. E.; McKean, J. P. et al.
Object Type:
Article
System:
The UNT Digital Library
High Efficiency R-744 Commercial Heat Pump Water Heaters
The project investigated the development and improvement process of a R744 (CO2) commercial heat pump water heater (HPWH) package of approximately 35 kW. The improvement process covered all main components of the system. More specific the heat exchangers (Internal heat exchanger, Evaporator, Gas cooler) as well as the expansion device and the compressor were investigated. In addition, a comparison to a commercially available baseline R134a unit of the same capacity and footprint was made in order to compare performance as well as package size reduction potential.
Date:
April 25, 2013
Creator:
Elbel, Stefan W. & Petersen, Michael
Object Type:
Report
System:
The UNT Digital Library
Initial Assessment of U.S. Refineries for Purposes of Potential Bio-Based Oil Insertions
This study examines how existing U.S. refining infrastructure matches in geography and processing capability with the needs projected from anticipated biofuels production. Key findings include: a potential shortfall in both overall hydrotreating capacity and hydrogen production capacity in refineries to manage the conversion of certain bio-derived feedstocks having high oxygen contents; a regional concentration of anticipated biofuel resources, placing added stress in particular refining regions (e.g. the Gulf Coast); uncertainties surrounding the impact of bio-derived fuel intermediates on the refiner’s ability to meet product performance and product quantity demands, and the need for better and more comprehensive chemical composition information; the need for considerably more data and experience on the behavior of projected biofuels feedstocks in refining processes (e.g. impacts on process performance and reliability); and the need to examine the optimum capital investment locations for additional processing equipment. For example, whether it is better to further refine biofuels at the new production sites, in centralized biofuel "depots", or whether the existing refining facilities should be expanded to better handle a more 'raw' biofuel.
Date:
April 25, 2013
Creator:
Freeman, Charles J.; Jones, Susanne B.; Padmaperuma, Asanga B.; Santosa, Daniel M.; Valkenburg, Corinne & Shinn, John
Object Type:
Report
System:
The UNT Digital Library
Interaction-Based Load Balancing in N-body Simulations
None
Date:
April 25, 2013
Creator:
Pearce, O.; Gamblin, T.; Schulz, M.; de Supinski, B. R. & Amato, N. M.
Object Type:
Article
System:
The UNT Digital Library
NORMETEX PUMP ALTERNATIVES STUDY
A mainstay pump for tritium systems, the Normetex scroll pump, is currently unavailable because the Normetex company went out of business. This pump was an all-metal scroll pump that served tritium processing facilities very well. Current tritium system operators are evaluating replacement pumps for the Normetex pump and for general used in tritium service. An all-metal equivalent alternative to the Normetex pump has not yet been identified. 1. The ideal replacement tritium pump would be hermetically sealed and contain no polymer components or oils. Polymers and oils degrade over time when they contact ionizing radiation. 2. Halogenated polymers (containing fluorine, chlorine, or both) and oils are commonly found in pumps. These materials have many properties that surpass those of hydrocarbon-based polymers and oils, including thermal stability (higher operating temperature) and better chemical resistance. Unfortunately, they are less resistant to degradation from ionizing radiation than hydrocarbon-based materials (in general). 3. Polymers and oils can form gaseous, condensable (HF, TF), liquid, and solid species when exposed to ionizing radiation. For example, halogenated polymers form HF and HCl, which are extremely corrosive upon reaction with water. If a pump containing polymers or oils must be used in a tritium system, the system must …
Date:
April 25, 2013
Creator:
Clark, E.
Object Type:
Report
System:
The UNT Digital Library
Post - Computer Simulation of an Electrostatic Generator - Example Case
None
Date:
April 25, 2013
Creator:
Post, R
Object Type:
Report
System:
The UNT Digital Library
Results for the Independent Sampling and Analysis of Used Oil Drums at the Impact Services Facility in Oak Ridge, TN
The U.S. Department of Energy (DOE) requested that Oak Ridge Associated Universities (ORAU), via the Oak Ridge Institute for Science and Education (ORISE) contract, perform independent sampling and analysis of used oils contained within eight 55 gallon drums stored at the former IMPACT Services facility, located at the East Tennessee Technology Park in Oak Ridge, Tennessee. These drums were originally delivered by LATA Sharp Remediation Services (LSRS) to IMPACT Services on January 11, 2011 as part of the Bldg. K-33 demolition project, and the drums plus contents should have been processed as non-hazardous non-radiological waste by IMPACT Services. LSRS received a certificate of destruction on August 29, 2012 (LSRS 2012a). However, IMPACT Services declared bankruptcy and abandoned the site later in 2012, and eight of the original eleven K-33 drums are currently stored at the facility. The content of these drums is the subject of this investigation. The original drum contents were sampled by LSRS in 2010 and analyzed for gross alpha, gross beta, and polychlorinated biphenyls (PCBs), using both compositing and grab sampling techniques. The objective of this 2013 sample and analysis effort was to duplicate, to the extent possible, the 2010 sampling and analysis event to support final …
Date:
April 25, 2013
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Titanium dxy Ferromagnetism at the LaAlO3/SrTiO3 Interface
None
Date:
April 25, 2013
Creator:
Lee, J. S.; Xie, Y. W.; Sato, H. K.; Bell, C.; Hikita, Y.; Hwang, H. Y. et al.
Object Type:
Article
System:
The UNT Digital Library
Unbound Particles in Dark Matter Halos
None
Date:
April 25, 2013
Creator:
Behroozi, Peter S.; /KIPAC, Menlo Park /Stanford U., Phys. Dept. /SLAC; Loeb, Abraham; U., /Harvard; Wechsler, Risa H. & /KIPAC, Menlo Park /Stanford U., Phys. Dept. /SLAC
Object Type:
Article
System:
The UNT Digital Library
Final Technical Report for "Feature Extraction, Characterization, and Visualization for Protein Interaction via Geometric and Topological Methods"
Shape analysis plays an important role in many applications. In particular, in molecular biology, analyzing molecular shapes is essential to the fundamental problem of understanding how molecules interact. This project aims at developing efficient and effective algorithms to characterize and analyze molecular structures using geometric and topological methods. Two main components of this project are (1) developing novel molecular shape descriptors; and (2) identifying and representing meaningful features based on those descriptors. The project also produces accompanying (visualization) software. Results from this project (09/2006â10/2009) include the following publications. We have also set up web-servers for the software developed in this period, so that our new methods are accessible to a broader scientific community. The web sites are given below as well. In this final technical report, we first list publications and software resulted from this project. We then briefly explain the research conducted and main accomplishments during the period of this project.
Date:
March 25, 2013
Creator:
Wang, Yusu
Object Type:
Text
System:
The UNT Digital Library
Geological and Geotechnical Site Investigation for the Design of a CO2 Rich Flue Gas Direct Injection and Storage Facility
With international efforts to limit anthropogenic carbon in the atmosphere, various CO{sub 2} sequestration methods have been studied by various facilities worldwide. Basalt rock in general has been referred to as potential host material for mineral carbonation by various authors, without much regard for compositional variations due to depositional environment, subsequent metamorphism, or hydrothermal alteration. Since mineral carbonation relies on the presence of certain magnesium, calcium, or iron silicates, it is necessary to study the texture, mineralogy, petrology, and geochemistry of specific basalts before implying potential for mineral carbonation. The development of a methodology for the characterization of basalts with respect to their susceptibility for mineral carbonation is proposed to be developed as part of this research. The methodology will be developed based on whole rock data, petrography and microprobe analyses for samples from the Caledonia Mine in Michigan, which is the site for a proposed small-scale demonstration project on mineral carbonation in basalt. Samples from the Keweenaw Peninsula will be used to determine general compositional trends using whole rock data and petrography. Basalts in the Keweenaw Peninsula have been subjected to zeolite and prehnite-pumpellyite facies metamorphism with concurrent native copper deposition. Alteration was likely due to the circulation of …
Date:
March 25, 2013
Creator:
Metz, Paul & Bolz, Patricia
Object Type:
Report
System:
The UNT Digital Library
Mathematical and Computational Tools for Predictive Simulation of Complex Coupled Systems under Uncertainty
Methods and algorithms are developed to enable the accurate analysis of problems that exhibit interacting physical processes with uncertainties. These uncertainties can pertain either to each of the physical processes or to the manner in which they depend on each others. These problems are cast within a polynomial chaos framework and their solution then involves either solving a large system of algebraic equations or a high dimensional numerical quadrature. In both cases, the curse of dimensionality is manifested. Procedures are developed for the efficient evaluation of the resulting linear equations that advantage of the block sparse structure of these equations, resulting in a block recursive Schur complement construction. In addition, embedded quadratures are constructed that permit the evaluation of very high-dimensional integrals using low-dimensional quadratures adapted to particular quantities of interest. The low-dimensional integration is carried out in a transformed measure space in which the quantity of interest is low-dimensional. Finally, a procedure is also developed to discover a low-dimensional manifold, embedded in the initial high-dimensional one, in which scalar quantities of interest exist. This approach permits the functional expression of the reduced space in terms of the original space, thus permitting cross-scale sensitivity analysis.
Date:
March 25, 2013
Creator:
Ghanem, Roger
Object Type:
Report
System:
The UNT Digital Library
NEW RESULTS ON THE LASER PRODUCED RELATIVISTIC ELECTRON-POSITRON PAIR PLASMA RESEARCH
None
Date:
March 25, 2013
Creator:
Chen, H
Object Type:
Article
System:
The UNT Digital Library
On the FEL gain limit
N/A
Date:
March 25, 2013
Creator:
N., Litvinenko V.
Object Type:
Report
System:
The UNT Digital Library
"CONFIRMATORY SURVEY RESULTS FOR THE ABB COMBUSTION ENGINEERING SITE WINDSOR, CONNECTICUT DCN 5158-SR-02-2
The objectives of the confirmatory activities were to provide independent contractor field data reviews and to generate independent radiological data for use by the NRC in evaluating the adequacy and accuracy of the contractor�s procedures and FSS results. ORAU reviewed ABB CE�s decommissioning plan, final status survey plan, and the applicable soil DCGLs, which were developed based on an NRC-approved radiation dose assessment. The surveys include gamma surface scans, gamma direct measurements, and soil sampling.
Date:
March 25, 2013
Creator:
ADAMS, WADE C
Object Type:
Report
System:
The UNT Digital Library
Using model analyses and surface-atmosphere exchange measurements from the Howland AmeriFlux Site in Maine, USA, to improve understanding of forest ecosystem C cycling
Summary of research carried out under Interagency Agreement DE-AI02-07ER64355 with the USDA Forest Service at the Howland Forest AmeriFlux site in central Maine. Includes a list of publications resulting in part or whole from this support.
Date:
March 25, 2013
Creator:
Hollinger, David Y.; Davidson, Eric A.; Richardson, Andrew D.; Dail, D. B. & Scott, N.
Object Type:
Report
System:
The UNT Digital Library
Award Nomination Information for Lawrence Livermore National LaboratorySkillSoft Perspectives Conference 2013
None
Date:
February 25, 2013
Creator:
Positeri, L A & Molyneaux, B R
Object Type:
Article
System:
The UNT Digital Library