Serial/Series Title
Proceedings of the Workshop on Geothermal Reservoir Engineering
28
Winter Fuels Report
17
Fiscal Year 1999
11
Fiscal Year 2000
9
Journal of Undergraduate Research
9
Notes of Monthly Component Test Program Review Meeting Held with SNPO at WANL
9
OIT Best Practices
8
Saxton Plutonium Project Quarterly Progress Report
8
Distributed Energy & Electric Reliability Fact Sheets
7
Chemical Processing Department Monthly Report
6
230 More
Country
States
Decade
Year
Month
Language
65,047 Matching Results
Results open in a new window/tab.
Results:
1 - 24 of
65,047
next
Application of Crunch-Flow Routines to Constrain Present and Past Carbon Fluxes at Gas-Hydrate Bearing Sites
In November 2012, Oregon State University initiated the project entitled: Application of Crunch-Flow routines to constrain present and past carbon fluxes at gas-hydrate bearing sites. Within this project we developed Crunch-Flow based modeling modules that include important biogeochemical processes that need to be considered in gas hydrate environments. Our modules were applied to quantify carbon cycling in present and past systems, using data collected during several DOE-supported drilling expeditions, which include the Cascadia margin in US, Ulleung Basin in South Korea, and several sites drilled offshore India on the Bay of Bengal and Andaman Sea. Specifically, we completed modeling efforts that: 1) Reproduce the compositional and isotopic profiles observed at the eight drilled sites in the Ulleung Basin that constrain and contrast the carbon cycling pathways at chimney (high methane flux) and non-chimney sites (low methane, advective systems); 2) Simulate the Ba record in the sediments to quantify the past dynamics of methane flux in the southern Hydrate Ridge, Cascadia margin; and 3) Provide quantitative estimates of the thickness of individual mass transport deposits (MTDs), time elapsed after the MTD event, rate of sulfate reduction in the MTD, and time required to reach a new steady state at several sites …
Date:
January 31, 2014
Creator:
Torres, Marta
Object Type:
Report
System:
The UNT Digital Library
FY13 Annual Progress Report for SECA Core Technology Program
This progress report covers technical work performed during fiscal year 2013 at PNNL under Field Work Proposal (FWP) 40552. The report highlights and documents technical progress in tasks related to advanced cell and stack component materials development and computational design and simulation. Primary areas of emphasis for the materials development work were metallic interconnects and coatings, cathode and anode stability/degradation, glass seals, and advanced testing under realistic stack conditions: Metallic interconnects and coatings • Effects of surface modifications to AISI 441 (prior to application of protective spinel coatings) on oxide scale growth and adhesion were evaluated as a function of temperature and time. Cathode stability/degradation • Effects of cathode air humidity on performance and stability of SOFC cathodes were investigated by testing anode-supported cells as a function of time and temperature. • In-situ high temperature XRD measurements were used to correlate changes in cathode lattice structure and composition with performance of anode-supported button cells. Anode stability/degradation • Effects of high fuel steam content on Ni/YSZ anodes were investigated over a range of time and temperature. • Vapor infiltration and particulate additions were evaluated as a potential means of improving tolerance of Ni/YSZ anodes to sulfur-bearing fuel species. Glass seals • …
Date:
January 31, 2014
Creator:
Stevenson, Jeffry W. & Koeppel, Brian J.
Object Type:
Report
System:
The UNT Digital Library
FY14 Q1 Progress Report for SECA Core Technology Program
This quarterly progress report was prepared under field work proposal (FWP) 40552 and covers technical work performed during the period October 1 through December 31, 2013 (FY14 1st quarter). The report highlights and documents technical progress and milestone status in tasks related to advanced cell and stack component materials development and computational design and simulation. Technical highlights related to cell and stack materials development and characterization include: • Surface modified, Ce-modified MC spinel-coated AISI 441 exhibited improved spallation resistance (compared to coated mill reference 441) after 30,000 hours of oxidation at 800ºC in air. Similar beneficial results from surface modification were observed after 26,000 hours of oxidation at 850ºC. • MnCo spinel coatings prepared from metallic powder precursors exhibited low area-specific resistance after 12,000 hours of testing at 800°C. • Long-term validation tests (6,000 hours of operation followed by 10 deep thermal cycles) of surface-blasted, spinel-coated AISI 441 interconnects were completed using PNNL’s SECA CTP stack test fixture. Results of post-test results will be reported in the next quarterly progress report. • Long-term evaluation of compliant glass seals (SCN-1 glass with YSZ fibers) was in progress using PNNL’s SECA CTP stack test fixture. • Baseline testing of LSCF-based cells from …
Date:
January 31, 2014
Creator:
Stevenson, Jeffry W. & Koeppel, Brian J.
Object Type:
Report
System:
The UNT Digital Library
Post-Closure Report for Closed Resource Conservation and Recovery Act Corrective Action Units, Nevada National Security Site, Nevada for fiscal year 2013 (October 2012 - September 2013)
This report serves as the combined annual report for post-closure activities for the following closed Corrective Action Units (CAUs): CAU 90, Area 2 Bitcutter Containment; CAU 91, Area 3 U-3fi Injection Well; CAU 92, Area 6 Decon Pond Facility; CAU 110, Area 3 WMD U-3ax/bl Crater; CAU 111, Area 5 WMD Retired Mixed Waste Pits; and, CAU 112, Area 23 Hazardous Waste Trenches.
Date:
January 31, 2014
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Direct Observation of Fine-Scale Energy Banding in Echo-Enabled Harmonic Generation
None
Date:
January 30, 2014
Creator:
Hemsing, E.; Xiang, D.; Dunning, M.; Weathersby, S.; Hast, C. & Raubenheimer, T.
Object Type:
Article
System:
The UNT Digital Library
Liquid-Air Interface Corrosion Testing Simulating The Environment Of Hanford Double Shell Tanks
Coupon tests on A537 carbon steel materials were conducted to evaluate the Liquid-Air Interface (LAI) corrosion susceptibility in a series of solutions designed to simulate conditions in the radioactive waste tanks located at the Hanford Nuclear Facility. The new stress corrosion cracking requirements and the impact of ammonia on LAI corrosion were the primary focus. The minimum R value (i.e., molar ratio of nitrite to nitrate) of 0.15 specified by the new stress corrosion cracking requirements was found to be insufficient to prevent pitting corrosion at the LAI. The pH of the test solutions was 10, which was actually less than the required pH 11 defined by the new requirements. These tests examined the effect of the variation of the pH due to hydroxide depletion at the liquid air interface. The pits from the current testing ranged from 0.001 to 0.008 inch in solutions with nitrate concentrations of 0.4 M and 2.0 M. The pitting and general attack that occurred progressed over the four-months. No significant pitting was observed, however, for a solution with a nitrate concentration of 4.5 M. The pitting depths observed in these partial immersion tests in unevaporated condensates ranged from 0.001 to 0.005 inch after 4 …
Date:
January 30, 2014
Creator:
Wiersma, B.; Gray, J. R.; Garcia-Diaz, B. L.; Murphy, T. H. & Hicks, K. R.
Object Type:
Report
System:
The UNT Digital Library
Semiconductor detectors with proximity signal readout
Semiconductor-based radiation detectors are routinely used for the detection, imaging, and spectroscopy of x-rays, gamma rays, and charged particles for applications in the areas of nuclear and medical physics, astrophysics, environmental remediation, nuclear nonproliferation, and homeland security. Detectors used for imaging and particle tracking are more complex in that they typically must also measure the location of the radiation interaction in addition to the deposited energy. In such detectors, the position measurement is often achieved by dividing or segmenting the electrodes into many strips or pixels and then reading out the signals from all of the electrode segments. Fine electrode segmentation is problematic for many of the standard semiconductor detector technologies. Clearly there is a need for a semiconductor-based radiation detector technology that can achieve fine position resolution while maintaining the excellent energy resolution intrinsic to semiconductor detectors, can be fabricated through simple processes, does not require complex electrical interconnections to the detector, and can reduce the number of required channels of readout electronics. Proximity electrode signal readout (PESR), in which the electrodes are not in physical contact with the detector surface, satisfies this need.
Date:
January 30, 2014
Creator:
Asztalos, Stephen J.
Object Type:
Report
System:
The UNT Digital Library
Vapor Space Corrosion Testing Simulating The Environment Of Hanford Double Shell Tanks
As part of an integrated program to better understand corrosion in the high level waste tanks, Hanford has been investigating corrosion at the liquid/air interface (LAI) and at higher areas in the tank vapor space. This current research evaluated localized corrosion in the vapor space over Hanford double shell tank simulants to assess the impact of ammonia and new minimum nitrite concentration limits, which are part of the broader corrosion chemistry limits. The findings from this study showed that the presence of ammonia gas (550 ppm) in the vapor space is sufficient to reduce corrosion over the short-term (i.e. four months) for a Hanford waste chemistry (SY102 High Nitrate). These findings are in agreement with previous studies at both Hanford and SRS which showed ammonia gas in the vapor space to be inhibitive. The presence of ammonia in electrochemical test solution, however, was insufficient to inhibit against pitting corrosion. The effect of the ammonia appears to be a function of the waste chemistry and may have more significant effects in waste with low nitrite concentrations. Since high levels of ammonia were found beneficial in previous studies, additional testing is recommended to assess the necessary minimum concentration for protection of carbon …
Date:
January 30, 2014
Creator:
Wiersma, B.; Gray, J. R.; Garcia-Diaz, B. L.; Murphy, T. H. & Hicks, K. R.
Object Type:
Report
System:
The UNT Digital Library
10 MW Supercritical CO2 Turbine Test
The Supercritical CO2 Turbine Test project was to demonstrate the inherent efficiencies of a supercritical carbon dioxide (s-CO2) power turbine and associated turbomachinery under conditions and at a scale relevant to commercial concentrating solar power (CSP) projects, thereby accelerating the commercial deployment of this new power generation technology. The project involved eight partnering organizations: NREL, Sandia National Laboratories, Echogen Power Systems, Abengoa Solar, University of Wisconsin at Madison, Electric Power Research Institute, Barber-Nichols, and the CSP Program of the U.S. Department of Energy. The multi-year project planned to design, fabricate, and validate an s-CO2 power turbine of nominally 10 MWe that is capable of operation at up to 700°C and operates in a dry-cooled test loop. The project plan consisted of three phases: (1) system design and modeling, (2) fabrication, and (3) testing. The major accomplishments of Phase 1 included: Design of a multistage, axial-flow, s-CO2 power turbine; Design modifications to an existing turbocompressor to provide s-CO2 flow for the test system; Updated equipment and installation costs for the turbomachinery and associated support infrastructure; Development of simulation tools for the test loop itself and for more efficient cycle designs that are of greater commercial interest; Simulation of s-CO2 power cycle …
Date:
January 29, 2014
Creator:
Turchi, Craig
Object Type:
Report
System:
The UNT Digital Library
Effect of Phosphate, Fluoride, and Nitrate on Gibbsite Dissolution Rate and Solubility
Laboratory tests have been completed with simulated tank waste samples to investigate the effects of phosphate, fluoride, and nitrate on the dissolution rate and equilibrium solubility of gibbsite in sodium hydroxide solution at 22 and 40{degrees}C. Results are compared to relevant literature data and to computer model predictions. The presence of sodium nitrate (3 M) caused a reduction in the rate of gibbsite dissolution in NaOH, but a modest increase in the equilibrium solubility of aluminum. The increase in solubility was not as large, though, as the increase predicted by the computer model. The presence of phosphate, either as sodium phosphate or sodium fluoride phosphate, had a negligible effect on the rate of gibbsite dissolution, but caused a slight increase in aluminum solubility. The magnitude of the increased solubility, relative to the increase caused by sodium nitrate, suggests that the increase is due to ionic strength (or water activity) effects, rather than being associated with the specific ion involved. The computer model predicted that phosphate would cause a slight decrease in aluminum solubility, suggesting some Al-PO4 interaction. No evidence was found of such an interaction.
Date:
January 29, 2014
Creator:
Herting, Daniel L.
Object Type:
Report
System:
The UNT Digital Library
A flexible method to calculate the distributions of discretization errors in operator-split codes with stochastic noise in problem data
None
Date:
January 29, 2014
Creator:
Chen, X; Connors, J M & Tong, C H
Object Type:
Report
System:
The UNT Digital Library
Fourier-transform Inelastic X-ray Scattering from time and Momentum Dependent Phonon-phonon Correlations
None
Date:
January 29, 2014
Creator:
Trigo, M.; Fuchs, M.; Chen, J.; Jiang, M. P.; Kozina, M. E.; Ndabashimiye, G. et al.
Object Type:
Article
System:
The UNT Digital Library
Mobility of Source Zone Heavy Metals and Radionuclides: The Mixed Roles of Fermentative Activity on Fate and Transport of U and Cr. Final Report
Various U. S. Department of Energy (DOE) low and medium-level radioactive waste sites contain mixtures of heavy metals, radionuclides and assorted organic materials. In addition, there are numerous sites around the world that are contaminated with a mixture of organic and inorganic contaminants. In most sites, over time, water infiltrates the wastes, and releases metals, radionuclides and other contaminants causing transport into the surrounding environment. We investigated the role of fermentative microorganisms in such sites that may control metal, radionuclide and organics migration from source zones. The project was initiated based on the following overarching hypothesis: Metals, radionuclides and other contaminants can be mobilized by infiltration of water into waste storage sites. Microbial communities of lignocellulose degrading and fermenting microorganisms present in the subsurface of contaminated DOE sites can significantly impact migration by directly reducing and immobilizing metals and radionuclides while degrading complex organic matter to low molecular weight organic compounds. These low molecular weight organic acids and alcohols can increase metal and radionuclide mobility by chelation (i.e., certain organic acids) or decrease mobility by stimulating respiratory metal reducing microorganisms. We demonstrated that fermentative organisms capable of affecting the fate of Cr6+, U6+ and trinitrotoluene can be isolated from organic-rich …
Date:
January 29, 2014
Creator:
Gerlach, Robin; Peyton, Brent M. & Apel, William A.
Object Type:
Report
System:
The UNT Digital Library
Novel Heavy Quark Phenomena in QCD
None
Date:
January 29, 2014
Creator:
Brodsky, Stanley J.
Object Type:
Article
System:
The UNT Digital Library
SciDAC Institute: Combinatorial Scientific Computing and Petascale Simulations (CSCAPES). Final Report
Final project report
Date:
January 29, 2014
Creator:
Catalyurek, Umit V.
Object Type:
Text
System:
The UNT Digital Library
Shock and ramp compression experiments: recent developments
None
Date:
January 29, 2014
Creator:
Eggert, J H
Object Type:
Article
System:
The UNT Digital Library
Submission of Final Scientific/Technical Report [Solar Avoided Cost Solution: SunShot 6 Final Report]
The core objectives of this project were two separate but integrated products, collectively providing game-changing Avoided Cost capabilities. • The first was a kit of avoided cost tools and data that any solar provider can use a-lacarte or as a whole. It’s open and easily accessible nature allows the rapid and accurate calculation of avoided cost in whatever context and software that make sense (“Typical and Avoided Cost Tools”). This kit includes a dataset of typical energy rates, costs and usage that can be used for solar prospecting, lead generation and any situation where data about an opportunity is missing or imperfect. • The second is a web application and related APIs specifically built for solar providers to radically streamline their lead-to-sale process (“Solar Provider Module”). The typical and Avoided Cost tools are built directly into this, and allow for solar providers to track their opportunities, collaborate with their installers and financiers, and close more sales faster.
Date:
January 29, 2014
Creator:
Danziger, Eric
Object Type:
Report
System:
The UNT Digital Library
Summary and Preliminary Interpretation of Tritium and Dissolved Noble Gas Data from Site 300
None
Date:
January 29, 2014
Creator:
Visser, A; Singleton, M; Madrid, V & Esser, B
Object Type:
Report
System:
The UNT Digital Library
Establishing MICHCARB, a geological carbon sequestration research and education center for Michigan, implemented through the Michigan Geological Repository for Research and Education, part of the Department of Geosciences at Western Michigan University
The Michigan Geological Repository for Research and Education (MGRRE), part of the Department of Geosciences at Western Michigan University (WMU) at Kalamazoo, Michigan, established MichCarb—a geological carbon sequestration resource center by: • Archiving and maintaining a current reference collection of carbon sequestration published literature • Developing statewide and site-specific digital research databases for Michigan’s deep geological formations relevant to CO2 storage, containment and potential for enhanced oil recovery • Producing maps and tables of physical properties as components of these databases • Compiling all information into a digital atlas • Conducting geologic and fluid flow modeling to address specific predictive uses of CO2 storage and enhanced oil recovery, including compiling data for geological and fluid flow models, formulating models, integrating data, and running the models; applying models to specific predictive uses of CO2 storage and enhanced oil recovery • Conducting technical research on CO2 sequestration and enhanced oil recovery through basic and applied research of characterizing Michigan oil and gas and saline reservoirs for CO2 storage potential volume, injectivity and containment. Based on our research, we have concluded that the Michigan Basin has excellent saline aquifer (residual entrapment) and CO2/Enhanced oil recovery related (CO2/EOR; buoyant entrapment) geological carbon sequestration potential …
Date:
January 28, 2014
Creator:
Barnes, David A. & Harrison, William B.
Object Type:
Report
System:
The UNT Digital Library
Final Report [The c-Abl signaling network in the radioadaptive response]
The radioadaptive response, or radiation hormesis, i.e. a low dose of radiation can protect cells and organisms from the effects of a subsequent higher dose, is a widely recognized phenomenon. Mechanisms underlying such radiation hormesis, however, remain largely unclear. Preliminary studies indicate an important role of c-Abl signaling in mediating the radioadaptive response. We propose to investigate how c-Abl regulates the crosstalk between p53 and NFκB in response to low doses irradiation. We found in our recent study that low dose IR induces a reciprocal p53 suppression and NFκB activation, which induces HIF-a and subsequently a metabolic reprogramming resulting in a transition from oxidative phosphorylation to glycolysis. Of importance is that this glycolytic switch is essential for the radioadaptive response. This low-dose radiationinduced HIF1α activation was in sharp contrast with the high-dose IR-induced p53 activation and HIF1α inhibition. HIF1α and p53 seem to play distinct roles in mediating the radiation dose-dependent metabolic response. The induction of HIF1α-mediated glycolysis is restricted to a low dose range of radiation, which may have important implications in assessing the level of radiation exposure and its potential health risk. Our results support a dose-dependent metabolic response to IR. When IR doses are below the threshold …
Date:
January 28, 2014
Creator:
Chi-Min, Yuan
Object Type:
Report
System:
The UNT Digital Library
National Ignition Facility, High-Energy-Density and Inertial Confinement Fusion, Peer-Review Panel (PRP) Final Report
None
Date:
January 28, 2014
Creator:
Keane, C. J.
Object Type:
Report
System:
The UNT Digital Library
Recent CKM And CP Results From BaBar
None
Date:
January 28, 2014
Creator:
Palombo, Fernando
Object Type:
Article
System:
The UNT Digital Library
Studies of the Internal Properties of Jets and Jet Substructure with the ATLAS Detector
None
Date:
January 28, 2014
Creator:
Miller, David W.
Object Type:
Article
System:
The UNT Digital Library
EP-DRAFT-1.1 2014-01-19 OSI-GAM-SOP-00x In Situ High-resolution Gamma Spectroscopy
None
Date:
January 27, 2014
Creator:
Wimer, N G & Kreek, S A
Object Type:
Report
System:
The UNT Digital Library