Serial/Series Title
Clean Cities alternative fuel information series
8
Fiscal Year 2000
8
Field Demonstration of a Membrane Process to Separate Nitrogen From Natural Gas Progress Report
7
Science & Technology Review
7
Fiscal Year 1998
6
National Bioenergy Center Biochemical Platform Integration Project Quarterly Update
6
Chemical Processing Department Monthly Report
5
Evaluation of Roof Bolting Requirements Based on In-Mine Bolter Drilling Progress Report
5
Fiscal Year 2003
5
Hanford Laboratories Operation Monthly Activities Report
5
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20,461 Matching Results
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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
Addressing Failures in Exascale Computing
This report talks about the Exascale Computing Failures in detail.
Date:
April 24, 2013
Creator:
Snir, M.; Wisniewski, R. W.; Abraham, J. A.; Adve, S. V.; Bagchi, S.; Balaji, P. et al.
Object Type:
Report
System:
The UNT Digital Library
Compositional threshold for Nuclear Waste Glass Durability
Within the composition space of glasses, a distinct threshold appears to exist that separates "good" glasses, i.e., those which are sufficiently durable, from "bad" glasses of a low durability. The objective of our research is to clarify the origin of this threshold by exploring the relationship between glass composition, glass structure and chemical durability around the threshold region.
Date:
April 24, 2013
Creator:
Kruger, Albert A.; Farooqi, Rahmatullah & Hrma, Pavel R.
Object Type:
Article
System:
The UNT Digital Library
Cosmic Ray Studies with the Fermi Gamma-ray Space Telescope Large Area Telescope
None
Date:
April 24, 2013
Creator:
Thompson, D. J.; Baldini, L. & Uchiyama, Y.
Object Type:
Article
System:
The UNT Digital Library
Flow Shear Effects in the Onset Physics of Resistive MHD Instabilities in Tokamaks. Final report
The progress in this research centers around the computational analysis of flow shear effects in the onset of a 3/2 mode driven by a 1/1 mode in DIII-D equilibria. The initial idea was to try and calculate, via nonlinear simulations with NIMROD, the effects of rotation shear on driven 3/2 and 2/1 seed island physics, in experimentally relevant DIIID equilibria. The simulations indicated that very small seed islands were directly driven, as shielding between the sawtooth and the surfaces is significant at the high Lundquist numbers of the experiment. Instead, long after the initial crash the difference in linear stability of the 3/2, which remained prevalent despite the flattening of the core profiles from the sawtooth, contributed to a difference in the eventual seed island evolution. Essentially the seed islands grew or decayed long after the sawtooth crash, and not directly from it. Effectively the dominant 1/1 mode was found to be dragging the coupled modes surrounding it at a high rate through the plasma at their surfaces. The 1/1 mode is locked to the local frame of the plasma in the core, where the flow rate is greatest. The resonant perturbations at the surrounding surfaces propagate in the 'high …
Date:
April 24, 2013
Creator:
Brennan, Dylan P.
Object Type:
Report
System:
The UNT Digital Library
A Fundamental Investigation on the Structural Dynamics of Model Siloxane Networks under Extreme Pressure
None
Date:
April 24, 2013
Creator:
Harley, S J & Lewicki, J P
Object Type:
Report
System:
The UNT Digital Library
Geometrical Optics of Dense Aerosols
Assembling a free-standing, sharp-edged slab of homogeneous material that is much denser than gas, but much more rare ed than a solid, is an outstanding technological challenge. The solution may lie in focusing a dense aerosol to assume this geometry. However, whereas the geometrical optics of dilute aerosols is a well-developed fi eld, the dense aerosol limit is mostly unexplored. Yet controlling the geometrical optics of dense aerosols is necessary in preparing such a material slab. Focusing dense aerosols is shown here to be possible, but the nite particle density reduces the eff ective Stokes number of the flow, a critical result for controlled focusing. __________________________________________________
Date:
April 24, 2013
Creator:
Hay, Michael J.; Valeo, Ernest J. & Fisch, Nathaniel J.
Object Type:
Report
System:
The UNT Digital Library
Interactions in 1-ethyl-3-methyl imidazolium tetracyanoborate ion pair: Spectroscopic and density functional study
Density Functional Theory is used to investigate a weakly coordinating room-temperature ionic liquid, 1-ethyl-3-methyl imidazolium tetracyanoborate ([Emim]{sup +}[TCB]{sup -}). Four locally stable conformers of the ion pair were located. Atoms-in-molecules (AIM) and electron density analysis indicated the existence of several hydrogen bonds. Further investigation through the Natural Bond Orbital (NBO) and Natural Energy Decomposition Analysis (NEDA) calculations provided insight into the origin of interactions in the [Emim]{sup +}[TCB]{sup -} ion pair. Strength of molecular interactions in the ionic liquid was correlated with frequency shifts of the characteristic vibrations of the ion pair. Harmonic vibrations of the ion pair were also compared with the experimental Raman and Infrared spectra. Vibrational frequencies were assigned by visualizing displacements of atoms around their equilibrium positions and through Potential Energy Distribution (PED) analysis.
Date:
April 24, 2013
Creator:
Mao, James X.; Lee, Anita S.; Kitchin, John R.; Nulwala, Hunaid B; Luebke, David R. & Damodaran, Krishnan
Object Type:
Article
System:
The UNT Digital Library
ION EXCHANGE PERFORMANCE OF TITANOSILICATES, GERMANATES AND CARBON NANOTUBES
This report presents a summary of testing the affinity of titanosilicates (TSP), germanium-substituted titanosilicates (Ge-TSP) and multiwall carbon nanotubes (MWCNT) for lanthanide ions in dilute nitric acid solution. The K-TSP ion exchanger exhibited the highest affinity for lanthanides in dilute nitric acid solutions. The Ge-TSP ion exchanger shows promise as a material with high affinity, but additional tests are needed to confirm the preliminary results. The MWCNT exhibited much lower affinities than the K-TSP in dilute nitric acid solutions. However, the MWCNT are much more chemically stable to concentrated nitric acid solutions and, therefore, may candidates for ion exchange in more concentrated nitric acid solutions. This technical report serves as the deliverable documenting completion of the FY13 research milestone, M4FT-13SR0303061 – measure actinide and lanthanide distribution values in nitric acid solutions with sodium and potassium titanosilicate materials.
Date:
April 24, 2013
Creator:
Alsobrook, A. & Hobbs, D.
Object Type:
Report
System:
The UNT Digital Library
Jet Substructure in ATLAS
None
Date:
April 24, 2013
Creator:
Miller, David W.
Object Type:
Article
System:
The UNT Digital Library
LEEM investigations of clean surfaces driven by energetic ion beams
The original purpose of this award was to use low‐energy electron microscopy (LEEM) to explore the dynamics of surfaces of clean single crystal surfaces when driven by a beam of energetic ions. The goal was to understand the nanoscience of hyperthermal growth, surface erosion by sublimation and irradiation, operation of surface sinks in irradiated materials, diffusion on driven surfaces, and the creation of structural patterns. This project was based on a novel LEEM system constructed by C. P. Flynn, which provided real‐time imaging of surface dynamics by scattering low energy electrons. With the passing of Prof. Flynn in late 2011, this project was completed under a slightly different scope by constructing a low‐energy, inelastic electron scattering (�EELS�) instrument. Consistent with Flynn�s original objectives for his LEEM system, this device probes the dynamics of crystal surfaces. However the measurements are not carried out in real time, but instead are done in the frequency domain, through the energy lost from the probe electrons. The purpose of this device is to study the collective bosonic excitations in a variety of materials, including high temperature superconductors, topological insulators, carbon allotropes including (but not limited to) graphene, etc. The ultimate goal here is to identify …
Date:
April 24, 2013
Creator:
Abbamonte, Peter M.
Object Type:
Report
System:
The UNT Digital Library
Properties of Alfven Eigenmodes in the TAE range on the National Spherical Torus Experiment-Upgrade
A second Neutral Beam (NB) injection line is being installed on the NSTX Upgrade device, resulting in six NB sources with di erent tangency radii that will be available for heating and current drive. This work explores the properties of instabilities in the frequency range of the Toroidal Alfv#19;en Eigenmode (TAE) for NSTX-U scenarios with various NB injection geometries, from more perpendicular to more tangential, and with increased toroidal magnetic eld with respect to previous NSTX scenarios. Predictions are based on analysis through the ideal MHD code NOVA-K. For the scenarios considered in this work, modi cations of the Alfv#19;en continuum result in a frequency upshift and a broadening of the radial mode structure. The latter e ect may have consequences for fast ion transport and loss. Preliminary stability considerations indicate that TAEs are potentially unstable, with ion Landau damping representing the dominant damping mechanism
Date:
April 24, 2013
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
redMaPPer I: Algorithm and SDSS DR8 Catalog
None
Date:
April 24, 2013
Creator:
Rykoff, E. S.; Rozo, E.; Busha, M. T.; Cunha, C. E.; Finoguenov, A.; Evrard, A. et al.
Object Type:
Article
System:
The UNT Digital Library
redMaPPer II: X-ray and SZ Performance Benchmarks for the SDSS Catalog
None
Date:
April 24, 2013
Creator:
Rozo, Eduardo & Rykoff, Eli S.
Object Type:
Article
System:
The UNT Digital Library
Assessing the Effects of Data Compression in Simulations Using Physically Motivated Metrics
None
Date:
April 23, 2013
Creator:
Laney, D; Langer, S; Weber, C; Lindstrom, P & Wegener, A
Object Type:
Article
System:
The UNT Digital Library
Boron-10 ABUNCL Prototype Models And Initial Active Testing
The Department of Energy Office of Nuclear Safeguards and Security (NA-241) is supporting the project Coincidence Counting With Boron-Based Alternative Neutron Detection Technology at Pacific Northwest National Laboratory (PNNL) for the development of a 3He proportional counter alternative neutron coincidence counter. The goal of this project is to design, build and demonstrate a system based upon 10B-lined proportional tubes in a configuration typical for 3He-based coincidence counter applications. This report provides results from MCNPX model simulations and initial testing of the active mode variation of the Alternative Boron-Based Uranium Neutron Coincidence Collar (ABUNCL) design built by General Electric Reuter-Stokes. Initial experimental testing of the as-delivered passive ABUNCL was previously reported.
Date:
April 23, 2013
Creator:
Kouzes, Richard T.; Ely, James H.; Lintereur, Azaree T. & Siciliano, Edward R.
Object Type:
Report
System:
The UNT Digital Library
Calculation of Neoclassical Toroidal Viscosity with a Particle Simulation in the Tokamak Magnetic Breaking Experiments
Accurate calculation of perturbed distribution function #14;δf and perturbed magnetic fi eld #14;δB is essential to achieve prediction of non-ambipolar transport and neoclassical toroidal viscosity (NTV) in perturbed tokamaks. This paper reports a study of the NTV with a #14;δf particle code (POCA) and improved understanding of magnetic braking in tokamak experiments. POCA calculates the NTV by computing #14;f with guiding-center orbit motion and using #14;B from the ideal perturbed equilibrium code (IPEC). POCA simulations are compared with experimental estimations for NTV, which are measured from angular momentum balance (DIII-D) and toroidal rotational damping rate (NSTX). The calculation shows good agreement in total NTV torque for the DIII-D discharge, where an analytic neoclassical theory also gives a consistent result thanks to relatively large aspect-ratio and slow toroidal rotations. In NSTX discharges, where the aspect-ratio is small and the rotation is fast, the theory only gives a qualitative guide for predicting NTV. However, the POCA simulation largely improves the quantitative NTV prediction for NSTX. It is discussed that a self- consistent calculation of δ#14;B using general perturbed equilibria is eventually necessary since a non-ideal plasma response can change the perturbed eld and thereby the NTV torque.
Date:
April 23, 2013
Creator:
Kimin Kim, et al
Object Type:
Report
System:
The UNT Digital Library
SPIN-TORQUE IN SYSTEMS WITH INHOMOGENEOUS MAGETIZATION
The work performed during the grant period focused on the phenomenon of spin-transfer torque. This is a quantum mechanical effect whereby the angular momentum of conduction electrons is transferred to the magnetization of ferromagnetic structures. Our work on this subject began with phenomenological drift-diffusion and Landau-Lifshitz-Gilbert equations to demonstrate unambiguously that unpolarized current flow from a nonmagnet into a ferromagnet can produce a precession-type instability of the magnetization. We then used Boltzmann calculations appropriate to spin-valve type magnetic heterostructures composed of a non-magnetic thin film sandwiched between two thin film layers with uniform magnetization. Perhaps our most important paper dealt with quantum and semi-classical calculations of spin-transfer torque in systems with domain walls and other inhomogeneous distributions of magnetization. The latter work caused us to suggest that the Landau-Lifshitz approach to magnetic damping provided a clearer picture of the physics than the more popular (but formally equivalent) Gilbert approach to damping. Finally, we returned to our Boltzmann calculations and made a serious effort to analyze experimental data on current-induced magnetization in switching in magnetic spin-valve structures. Our work was part of a world-wide effort to study and harness the transport of the electron's spin and was one of the first …
Date:
April 23, 2013
Creator:
Zangwill, Andrew
Object Type:
Report
System:
The UNT Digital Library