States
Decade
Year
Month
18,091 Matching Results
Results open in a new window/tab.
Results:
1 - 24 of
18,091
next
Cast Stone Formulation At Higher Sodium Concentrations
A low temperature waste form known as Cast Stone is being considered to provide supplemental Low Activity Waste (LAW) immobilization capacity for the Hanford site. Formulation of Cast Stone at high sodium concentrations is of interest since a significant reduction in the necessary volume of Cast Stone and subsequent disposal costs could be achieved if an acceptable waste form can be produced with a high sodium molarity salt solution combined with a high water to premix (or dry blend) ratio. The objectives of this study were to evaluate the factors involved with increasing the sodium concentration in Cast Stone, including production and performance properties and the retention and release of specific components of interest. Three factors were identified for the experimental matrix: the concentration of sodium in the simulated salt solution, the water to premix ratio, and the blast furnace slag portion of the premix. The salt solution simulants used in this study were formulated to represent the overall average waste composition. The cement, blast furnace slag, and fly ash were sourced from a supplier in the Hanford area in order to be representative. The test mixes were prepared in the laboratory and fresh properties were measured. Fresh density increased …
Date:
February 28, 2014
Creator:
Fox, K. M.; Roberts, K. A. & Edwards, T. B.
Object Type:
Report
System:
The UNT Digital Library
Center for Momentum Transport and Flow Organization in Plasmas and Magnetofluids (CMTFO)
The CMTFO funding partially supports a junior researcher and a graduate student at UCI. During this project, we have further developed the global gyrokinetic particle code GTC to study the momentum transport in tokamak driven by electrostatic ion temperature gradient (ITG) turbulence [1] with kinetic electrons and by collisionless trapped electron mode (CTEM) turbulence [2]. We have also upgraded GTC for fully electromagnetic simulation and for linear plasma configuration with verification and validation of the electron temperature gradient (ETG) turbulence in Columbia Linear Machine. The followings are the highlights on the physics results reported in the key publications of this project.
Date:
February 28, 2014
Creator:
Lin, Zhihong
Object Type:
Report
System:
The UNT Digital Library
Multi-Hybrid Power Vehicles with Cost Effective and Durable Polymer Electrolyte
Anima Bose, the principal investigator of the project, originally proposed to develop composite membranes to operate PEMFCs at much higher temperatures than 80{degrees}C and to alleviate the flooding problems often encountered in Nafion menmbrane containing fuel cells. The PI has successfully created composite membranes by blending small quantities of octasilane-poss (OSP) with Nafion. The composite membranes exhibited temperature tolerance up to 110{degrees}C without scarifying cell performance as determined by polarization curves and proton conductivity measurements. These membranes also exhibited superior water management performance as evident from the lack of flooding. Furthermore, these fuel cells performed well under reduced humidities. Structural and thermal analyses revealed that these Nafion-octasilane composite membranes are homogenous at concentrations up to 3 wt% of the OSP and that the siloxane offers additional thermal stability.
Date:
February 28, 2014
Creator:
Bose, Anima
Object Type:
Report
System:
The UNT Digital Library
Reversal of OFI and CHF in Research Reactors Operating at 1 to 50 Bar. Version 1.0
None
Date:
February 28, 2014
Creator:
Kalimullah, M.; Olson, A. P.; Dionne, B.; Feldman, E. E. & Matos, J. E.
Object Type:
Report
System:
The UNT Digital Library
Shallow Water Offshore Wind Optimization for the Great Lakes (DE-FOA-0000415) Final Report: A Conceptual Design for Wind Energy in the Great Lakes
The primary objective of the project was to develop a innovative Gravity Base Foundation (GBF) concepts, including fabrication yards, launching systems and installation equipment, for a 500MW utility scale project in the Great Lakes (Lake Erie). The goal was to lower the LCOE by 25%. The project was the first to investigate an offshore wind project in the Great Lakes and it has furthered the body of knowledge for foundations and installation methods within Lake Erie. The project collected historical geotechnical information for Lake Erie and also used recently obtained data from the LEEDCo Icebreaker Project (FOA DE-EE0005989) geotechnical program to develop the conceptual designs. Using these data-sets, the project developed design wind and wave conditions from actual buoy data in order to develop a concept that would de-risk a project using a GBF. These wind and wave conditions were then utilized to create reference designs for various foundations specific to installation in Lake Erie. A project partner on the project (Weeks Marine) provided input for construction and costing the GBF fabrication and installation. By having a marine contractor with experience with large marine projects as part of the team provides credibility to the LCOE developed by NREL. NREL then …
Date:
February 28, 2014
Creator:
Wissemann, Chris & White, Stanley M
Object Type:
Report
System:
The UNT Digital Library
Analysis Of Tank 38H (HTF-38-14-6, 7) And Tank 43H (HTF-43-14-8, 9) Samples For Support Of The Enrichment Control And Corrosion Control Programs
SRNL performed analysis on Tanks 38H and 43H surface and subsurface supernate samples to support ECP and CCP. The U-235 mass divided by the total U mass ranged from 0.0059 to 0.0060. Uranium concentration ranged from 53.1 mg/L in the Tank 43H surface sample to the 85.1 mg/L in the Tank 38H subsurface sample. The U-235/U and uranium concentration are in line with the prior 2H-Evaporator System ECP samples.
Date:
February 27, 2014
Creator:
Martino, C. J.
Object Type:
Report
System:
The UNT Digital Library
Crystallization In High Level Waste (HLW) Glass Melters: Operational Experience From The Savannah River Site
processing strategy for the Hanford Tank Waste Treatment and Immobilization Plant (WTP). The basis of this alternative approach is an empirical model predicting the crystal accumulation in the WTP glass discharge riser and melter bottom as a function of glass composition, time, and temperature. When coupled with an associated operating limit (e.g., the maximum tolerable thickness of an accumulated layer of crystals), this model could then be integrated into the process control algorithms to formulate crystal tolerant high level waste (HLW) glasses targeting higher waste loadings while still meeting process related limits and melter lifetime expectancies. This report provides a review of the scaled melter testing that was completed in support of the Defense Waste Processing Facility (DWPF) melter. Testing with scaled melters provided the data to define the DWPF operating limits to avoid bulk (volume) crystallization in the un-agitated DWPF melter and provided the data to distinguish between spinels generated by K-3 refractory corrosion versus spinels that precipitated from the HLW glass melt pool. This report includes a review of the crystallization observed with the scaled melters and the full scale DWPF melters (DWPF Melter 1 and DWPF Melter 2). Examples of actual DWPF melter attainment with Melter 2 …
Date:
February 27, 2014
Creator:
Fox, K. M.
Object Type:
Report
System:
The UNT Digital Library
Recent BaBar Studies of Bottomonium States
None
Date:
February 27, 2014
Creator:
Guido, Elisa
Object Type:
Article
System:
The UNT Digital Library
Measurements of Anti-B /to D(*) Tau- Anti-Nu/Tau And |V(Ub)| at BaBar
None
Date:
February 26, 2014
Creator:
Sevilla, Manuel Franco
Object Type:
Article
System:
The UNT Digital Library
Recent BaBar Charm Physics Results
None
Date:
February 26, 2014
Creator:
Martinelli, Maurizio
Object Type:
Article
System:
The UNT Digital Library
Recent BaBar Measurements of Hadronic B Branching Fractions
None
Date:
February 26, 2014
Creator:
Gaz, Alessandro
Object Type:
Article
System:
The UNT Digital Library
Searches for Rare and Forbidden B and Charm Decays at the BaBar Experiment
None
Date:
February 26, 2014
Creator:
Grauges, Eugeni
Object Type:
Article
System:
The UNT Digital Library
Sol-Gel Based Polybenzimidazole Membranes for Hydrogen Pumping Devices
Electrochemical hydrogen pumping using a high temperature (>100°C) PBI membrane was demonstrated under non-humidified and humidified conditions at ambient pressures. Relatively low voltages were required to operate the pump over a wide range of hydrogen flow rates. The advantages of the high temperature capability were shown by operating the pump on reformate feed gas mixtures containing various amounts of CO and CO{sub 2}. Gas purity measurements on the cathode gas product were conducted and significant reductions in gas impurities were detected. The applicability of the PBI membrane for electrochemical hydrogen pumping and its durability under typical operating conditions was established with tests that lasted for nearly 4000 hours.
Date:
February 26, 2014
Creator:
Benicewicz, Brian
Object Type:
Report
System:
The UNT Digital Library
Three-Dimensional Surface Geophysical Exploration of the 200-Series Tanks at the 241-C Tank Farm
A surface geophysical exploration (SGE) survey using direct current electrical resistivity was conducted within the C Tank Farm in the vicinity of the 200-Series tanks at the Hanford Site near Richland, Washington. This survey was the second successful SGE survey to utilize the Geotection(TM)-180 Resistivity Monitoring System which facilitated a much larger survey size and faster data acquisition rate. The primary objective of the C Tank Farm SGE survey was to provide geophysical data and subsurface imaging results to support the Phase 2 RCRA Facility Investigation, as outlined in the Phase 2 RCRA Facility Investigation / Corrective Measures work plan RPP-PLAN-39114.
Date:
February 26, 2014
Creator:
Crook, N.; McNeill, M.; Dunham, Ralph & Glaser, Danney R.
Object Type:
Report
System:
The UNT Digital Library
CRADA Final Report For CRADA NO. CR-12-006 [Operation and Testing of an SO{sub 2}-depolarized Electrolyzer (SDE) for the Purpose of Hydrogen and Sulfuric Acid Production]
Over the past several years, Savannah River National Laboratory (SRNL) has led a team of collaborators under the Department of Energy’s (DOE) nuclear hydrogen production program to develop the Hybrid Sulfur (HyS) Process. HyS is a 2-step water-splitting process consisting of high temperature decomposition of sulfuric acid to generate SO{sub 2}, followed by the electrolysis of aqueous SO{sub 2} to generate hydrogen and sulfuric acid. The latter is fed back into the high temperature reactor. SRNL designed and built an SO{sub 2}-depolarized electrolyzer (SDE) and a test facility. Over 40 SDE’s were tested using different catalysts, membranes and other components. SRNL demonstrated that an SDE could be operated continuously for approximately 200 hours under certain conditions without buildup of sulfur at the SDE’s cathode, thus solving a key technical problem with SDE technology. Air Products and Chemicals, Inc. (APCI) is a major supplier of hydrogen production systems, and they have proprietary technology that could benefit from the SDE developed by SRNS, or some improved version thereof. However, to demonstrate that SRNL’s SDE is a truly viable approach to the electrolyzer design, continuous operation for far greater periods of time than 200 hours must be demonstrated, and the electrolyzer must be …
Date:
February 24, 2014
Creator:
Summers, W. A.; Colon-Mercado, H. R.; Steimke, J. L. & Zahn, Steffen
Object Type:
Report
System:
The UNT Digital Library
Electron g-2 in Light-Front Quantization
None
Date:
February 24, 2014
Creator:
Zhao, Xingbo; Honkanen, Heli; Maris, Pieter; Vary, James P. & Brodsky, Stanley J.
Object Type:
Article
System:
The UNT Digital Library
Computational Nanophotonics: Model Optical Interactions and Transport in Tailored Nanosystem Architectures
The program is directed toward development of new computational approaches to photoprocesses in nanostructures whose geometry and composition are tailored to obtain desirable optical responses. The emphasis of this specific program is on the development of computational methods and prediction and computational theory of new phenomena of optical energy transfer and transformation on the extreme nanoscale (down to a few nanometers).
Date:
February 21, 2014
Creator:
Stockman, Mark & Gray, Steven
Object Type:
Report
System:
The UNT Digital Library
Energy Saving Melting and Revert Reduction Technology (Energy-SMARRT): Surface/Near Surface Indication - Characterization of Surface Anomalies from Magnetic Particle and Liquid Penetrant Indications
The systematic study and characterization of surface indications has never been conducted. Producers and users of castings do not have any data on which they can reliably communicate the nature of these indications or their effect on the performance of parts. Clearly, the ultimate intent of any work in this area is to eliminate indications that do in fact degrade properties. However, it may be impractical physically and/or financially to eliminate all surface imperfections. This project focused on the ones that actually degrade properties. The initial work was to identify those that degrade properties. Accurate numerical simulations of casting service performance allow designers to use the geometric flexibility of castings and the superior properties of steel to produce lighter weight and more energy efficient components for transportation systems (cars and trucks), construction, and mining. Accurate simulations increase the net melting energy efficiency by improving casting yield and reducing rework and scrap. Conservatively assuming a 10% improvement in yield, approximately 1.33 x 1012 BTU/year can be saved with this technology. In addition, CO2 emissions will be reduced by approximately 117,050 tons per year.
Date:
February 20, 2014
Creator:
Griffin, John
Object Type:
Report
System:
The UNT Digital Library
The BlackHat Library for One-Loop Amplitudes
None
Date:
February 19, 2014
Creator:
Bern, Z.; Dixon, L. J.; Cordero, F. Febres; Hoeche, S.; Ita, H.; Kosower, D. A. et al.
Object Type:
Article
System:
The UNT Digital Library
CDMSlite: A Search for Low-Mass WIMPs using Voltage-Assisted Calorimetric Ionization Detection in the SuperCDMS Experiment
None
Date:
February 19, 2014
Creator:
Agnese, R.; Anderson, A. J.; Asai, M.; Balakishiyeva, D.; Thakur, R. Basu; Bauer, D. A. et al.
Object Type:
Article
System:
The UNT Digital Library
The four-loop remainder function and multi-Regge behavior at NNLLA in planar N=4 super-Yang-Mills theory
None
Date:
February 19, 2014
Creator:
Dixon, Lance J.; Drummond, James M.; Duhr, Claude & Pennington, Jeffrey
Object Type:
Article
System:
The UNT Digital Library
FY13 Progress Report on the Phase I Mini-SHINE Water Irradiations and Micro-SHINE Irradiations
None
Date:
February 19, 2014
Creator:
Youker, A. J.; Krebs, J. F.; Kalensky, M.; Tkac, P.; Chemerisov, S. & Vandegrift, G. F. (Chemical Sciences and Engineering Division)
Object Type:
Report
System:
The UNT Digital Library
Ntuples for NLO events at Hadron Colliders
None
Date:
February 19, 2014
Creator:
Bern, Z.; Dixon, L.J.; Cordero, F.Febres; Hoeche, S.; Ita, H.; Kosower, D.A. et al.
Object Type:
Article
System:
The UNT Digital Library
Organic Matter Composition, Recycling Susceptibility, and the Effectiveness of the Biological Pump – An Evaluation Using NMR Spectra of Marine Plankton
Carbon (C) sequestration through fertilization of phytoplankton with micronutrients and enhancement of the absorption and retention of atmospheric C by ocean biota heavily depends on the efficiency of the “biological pump”. The long-term effectiveness of this strategy depends on a net transfer of C from the upper ocean-atmosphere system to the deep ocean where the C is removed from contact with the atmosphere for an extended period of time. This C removal can be equated to the amount of C fixation by phytoplankton minus the C cycling and regeneration in the euphotic zone. If the regeneration efficiency is increased, then despite increased C fixation, no net loss (sequestration) of C will result. A reduction in cycling efficiency in the euphotic zone, on the other hand, will increase the effectiveness of the “biological pump” and thus C sequestration. The degree of organic matter biodegradation and recycling depends on the “reactivity” of compounds synthesized by the biota, which in turn, is controlled by the structural characteristic of these compounds. There is considerable evidence that different phytoplankton taxa differ substantially in their biogeochemical characteristics and it is likely that the relative abundance of different compounds synthesized by these distinct taxa, and even within …
Date:
February 19, 2014
Creator:
Paytan, Adina
Object Type:
Report
System:
The UNT Digital Library