Positivity Preservation and Advection Algorithm Tests for Edge Plasma Turbulence (open access)

Positivity Preservation and Advection Algorithm Tests for Edge Plasma Turbulence

None
Date: August 8, 2012
Creator: Peterson, J L & Hammett, G W
System: The UNT Digital Library
2012 MULTIPHOTON PROCESSES GRC, JUNE 3-8, 2012 (open access)

2012 MULTIPHOTON PROCESSES GRC, JUNE 3-8, 2012

The sessions will focus on:  Attosecond science;  Strong-field processes in molecules and solids;  Generation of harmonics and attosecond pulses;  Free-electron laser experiments and theory;  Ultrafast imaging;  Applications of very high intensity lasers;  Propagation of intense laser fields.
Date: March 8, 2012
Creator: Walker, Barry
System: The UNT Digital Library
Brewster Angle Polarizing Beamsplitter Laser Damage Competition: "P" polarization (open access)

Brewster Angle Polarizing Beamsplitter Laser Damage Competition: "P" polarization

None
Date: November 8, 2012
Creator: Stolz, C. J. & Runkel, J.
System: The UNT Digital Library
Comparison of ELM heat loads in snowflake and standard divertors (open access)

Comparison of ELM heat loads in snowflake and standard divertors

An analysis is given of the impact of the tokamak divertor magnetic structure on the temporal and spatial divertor heat flux from edge localized modes (ELMs). Two configurations are studied: the standard divertor where the poloidal magnetic field (B{sub p}) varies linearly with distance (r) from the magnetic null and the snowflake where B{sub p} varies quadratrically with r. Both one and two-dimensional models are used to analyze the effect of the longer magnetic field length between the midplane and the divertor plate for the snowflake that causes a temporal dilation of the ELM divertor heat flux. A second effect discussed is the appearance of a broad region near the null point where the poloidal plasma beta can substantially exceed unity, especially for the snowflake configuration during the ELM; such a condition is likely to drive additional radial ELM transport.
Date: May 8, 2012
Creator: Rognlien, T. D.; Cohen, R. H.; Ryutov, D. D. & Umansky, M. V.
System: The UNT Digital Library
Jet Substructure at the Tevatron And LHC: New Results, New Tools, New Benchmarks (open access)

Jet Substructure at the Tevatron And LHC: New Results, New Tools, New Benchmarks

None
Date: November 8, 2012
Creator: Altheimer, A.; U., /Columbia; Arora, S.; /Rutgers U., Piscataway; Asquith, L.; /Argonne et al.
System: The UNT Digital Library
A Compact UV Timing Fiducial System for use with x-Ray Streak Cameras at NIF (open access)

A Compact UV Timing Fiducial System for use with x-Ray Streak Cameras at NIF

None
Date: August 8, 2012
Creator: Homoelle, D.; Bowers, M.; Browning, D.; Burns, S.; Golick, B.; Erbert, G. et al.
System: The UNT Digital Library
TAGGING, TRACKING AND LOCATING WITHOUT GPS (open access)

TAGGING, TRACKING AND LOCATING WITHOUT GPS

The Savannah River National Laboratory (SRNL) was requested to lead a Law Enforcement Working Group that was formed to collaborate on common operational needs. All agencies represented on the working group ranked their need to tag, track, and locate a witting or unwitting target as their highest priority. Specifically, they were looking for technologies more robust than Global Positioning Satellite (GPS), could communicate back to the owner, and worked where normal cell phone communications did not work or were unreliable. SRNL brought together multiple technologies in a demonstration that was held in in various Alaska venues, including metropolitan, wilderness, and at-sea that met the working group's requirements. Using prototypical technologies from Boeing, On Ramp, and Fortress, SRNL was able to demonstrate the ability to track personnel and material in all scenarios including indoors, in heavily wooden areas, canyons, and in parking garages. In all cases GPS signals were too weak to measure. Bi-directional communication was achieved in areas that Wi-Fi, cell towers, or traditional radios would not perform. The results of the exercise will be presented. These technologies are considered ideal for tracking high value material such has nuclear material with a platform that allows seamless tracking anywhere in the …
Date: July 8, 2012
Creator: Cordaro, J.; Coleman, T. & Shull, D.
System: The UNT Digital Library
RADIOACTIVE HIGH LEVEL WASTE TANK PITTING PREDICTIONS: AN INVESTIGATION INTO CRITICAL SOLUTION CONCENTRATIONS (open access)

RADIOACTIVE HIGH LEVEL WASTE TANK PITTING PREDICTIONS: AN INVESTIGATION INTO CRITICAL SOLUTION CONCENTRATIONS

A series of cyclic potentiodynamic polarization tests was performed on samples of ASTM A537 carbon steel in support of a probability-based approach to evaluate the effect of chloride and sulfate on corrosion the steel�s susceptibility to pitting corrosion. Testing solutions were chosen to systemically evaluate the influence of the secondary aggressive species, chloride, and sulfate, in the nitrate based, high-level wastes. The results suggest that evaluating the combined effect of all aggressive species, nitrate, chloride, and sulfate, provides a consistent response for determining corrosion susceptibility. The results of this work emphasize the importance for not only nitrate concentration limits, but also chloride and sulfate concentration limits.
Date: November 8, 2012
Creator: Hoffman, E.
System: The UNT Digital Library
Thermal characteristics of air flow cooling in the lithium ion batteries experimental chamber (open access)

Thermal characteristics of air flow cooling in the lithium ion batteries experimental chamber

A battery pack prototype has been designed and built to evaluate various air cooling concepts for the thermal management of Li-ion batteries. The heat generation from the Li-Ion batteries was simulated with electrical heat generation devices with the same dimensions as the Li-Ion battery (200 mm x 150 mm x 12 mm). Each battery simulator generates up to 15W of heat. There are 20 temperature probes placed uniformly on the surface of the battery simulator, which can measure temperatures in the range from -40 C to +120 C. The prototype for the pack has up to 100 battery simulators and temperature probes are recorder using a PC based DAQ system. We can measure the average surface temperature of the simulator, temperature distribution on each surface and temperature distributions in the pack. The pack which holds the battery simulators is built as a crate, with adjustable gap (varies from 2mm to 5mm) between the simulators for air flow channel studies. The total system flow rate and the inlet flow temperature are controlled during the test. The cooling channel with various heat transfer enhancing devices can be installed between the simulators to investigate the cooling performance. The prototype was designed to configure …
Date: July 8, 2012
Creator: A., Lukhanin; U., Rohatgi; Belyaev, A.; Fedorchenko, D.; Khazhmuradov, M.; Lukhanin, O et al.
System: The UNT Digital Library
2012 ELECTRONIC PROCESSES IN ORGANIC MATERIALS GORDON RESEARCH SEMINAR, JUNE 2-8, 2012 (open access)

2012 ELECTRONIC PROCESSES IN ORGANIC MATERIALS GORDON RESEARCH SEMINAR, JUNE 2-8, 2012

This meeting focuses on the latest progress and challenges regarding organic electronics devices, artificial light-harvesting systems, and inorganic/organic hybrid nanoscale systems and especially on the synergy between these fields.
Date: June 8, 2012
Creator: Eisele, Dorthe
System: The UNT Digital Library
Development of the bus joint for the ITER Central Solenoid (open access)

Development of the bus joint for the ITER Central Solenoid

None
Date: August 8, 2012
Creator: Martovetsky, N. N.; Irick, D. K. & Kenney, S. J.
System: The UNT Digital Library
Finding Motifs in Wind Generation Time Series Data (open access)

Finding Motifs in Wind Generation Time Series Data

None
Date: August 8, 2012
Creator: Kamath, C & Fan, Y J
System: The UNT Digital Library
Channel Modeling and Time Delay Estimation for Clock Synchronization Among Seaweb Nodes (open access)

Channel Modeling and Time Delay Estimation for Clock Synchronization Among Seaweb Nodes

From simulations, tracking of the impulse response is feasible. Potential to benefit other functions such as ranging between two nodes. Potential to combine the features of different protocols to create a new and more realistic clock-synchronization protocol.
Date: July 8, 2012
Creator: Gagnon, Pascal; Rice, Joseph A. & Clark, Grace A.
System: The UNT Digital Library
Computer experiments on the onset of turbulence (open access)

Computer experiments on the onset of turbulence

None
Date: August 8, 2012
Creator: Weisgraber, T H & Alder, B J
System: The UNT Digital Library
A Search for Dark Higgs Bosons (open access)

A Search for Dark Higgs Bosons

Recent astrophysical and terrestrial experiments have motivated the proposal of a dark sector with GeV-scale gauge boson force carriers and new Higgs bosons. We present a search for a dark Higgs boson using 516 fb{sup -1} of data collected with the BABAR detector. We do not observe a significant signal and we set 90% confidence level upper limits on the product of the Standard Model-dark sector mixing angle and the dark sector coupling constant.
Date: June 8, 2012
Creator: Lees, J.P.
System: The UNT Digital Library
Dosimetric Quantities and Neutron Spectra Outside the Shielding of Electron Accelerators (open access)

Dosimetric Quantities and Neutron Spectra Outside the Shielding of Electron Accelerators

None
Date: October 8, 2012
Creator: Fasso, Alberto; Lab, /SLAC /Jefferson; Liu, James C.; Rokni, Sayed H & /SLAC
System: The UNT Digital Library
SELECTION OF SURPLUS PLUTONIUM MATERIALS FOR DISPOSITION TO WIPP (open access)

SELECTION OF SURPLUS PLUTONIUM MATERIALS FOR DISPOSITION TO WIPP

The U.S. Department of Energy (DOE) is preparing a Surplus Plutonium Disposition (SPD) Supplemental Environmental Impact Statement (SEIS). Included in the evaluation are up to 6 metric tons (MT) of plutonium in the form of impure oxides and metals for which a disposition plan has not been decided, among options that include preparation as feed for the Mixed Oxide Fuel Fabrication Facility; disposing to high-level waste through the Savannah River Site (SRS) HB Line and H Canyon; can-in-canister disposal using the SRS Defense Waste Processing Facility; and preparation for disposal at the Waste Isolation Pilot Plant (WIPP). DOE and SRS have identified at least 0.5 MT of plutonium that, because of high levels of chemical and isotopic impurities, is impractical for disposition by methods other than the WIPP pathway. Characteristics of these items and the disposition strategy are discussed.
Date: June 8, 2012
Creator: Allender, J.; Mcclard, J. & Christopher, J.
System: The UNT Digital Library
Potential Emissions of Tritium in Air from Wells on the Nevada National Security Site (open access)

Potential Emissions of Tritium in Air from Wells on the Nevada National Security Site

This slide-show discusses the Nevada National Security Site (NNSS) and tritium in the groundwater. It describes the wells and boreholes and potential airflow from these sources. Monitoring of selected wells is discussed and preliminary results are presented.
Date: October 8, 2012
Creator: Warren, R.
System: The UNT Digital Library
Particle Size-Dependent Photoelectron Plasmon Loss Features In Deposited Germanium Nanocrystals (open access)

Particle Size-Dependent Photoelectron Plasmon Loss Features In Deposited Germanium Nanocrystals

None
Date: March 8, 2012
Creator: Bostedt, C; Willey, T; Terminello, L & van Buuren, T
System: The UNT Digital Library
High-Performance Computing for Electric Grid Planning and Operations (open access)

High-Performance Computing for Electric Grid Planning and Operations

None
Date: February 8, 2012
Creator: Epperly, T W; Edmunds, T; Lamont, A; Meyers, C; Smith, S; Yao, Y et al.
System: The UNT Digital Library
Methods of reducing vehicle aerodynamic drag (open access)

Methods of reducing vehicle aerodynamic drag

A small scale model (length 1710 mm) of General Motor SUV was built and tested in the wind tunnel for expected wind conditions and road clearance. Two passive devices, rear screen which is plate behind the car and rear fairing where the end of the car is aerodynamically extended, were incorporated in the model and tested in the wind tunnel for different wind conditions. The conclusion is that rear screen could reduce drag up to 6.5% and rear fairing can reduce the drag by 26%. There were additional tests for front edging and rear vortex generators. The results for drag reduction were mixed. It should be noted that there are aesthetic and practical considerations that may allow only partial implementation of these or any drag reduction options.
Date: July 8, 2012
Creator: V., Sirenko & U., Rohatgi
System: The UNT Digital Library
Modeling of Coherent Synchrotron Radiation using a Direct Numerical Solution of Maxwell's Equations (open access)

Modeling of Coherent Synchrotron Radiation using a Direct Numerical Solution of Maxwell's Equations

None
Date: October 8, 2012
Creator: Novokhatski, A.
System: The UNT Digital Library
Integrated, Geothermal-CO2 Storage Reservoirs: Adaptable, Multi-Stage, Sustainable, Energy-Recovery Strategies that Reduce Carbon Intensity and Environmental Risk (open access)

Integrated, Geothermal-CO2 Storage Reservoirs: Adaptable, Multi-Stage, Sustainable, Energy-Recovery Strategies that Reduce Carbon Intensity and Environmental Risk

None
Date: May 8, 2012
Creator: Buscheck, T A; Elliot, T R; Celia, M A; Chen, M; Hao, Y; Lu, C et al.
System: The UNT Digital Library
Model-Based, Memory-Centric Performance and Power Optimization on NUMA Multiprocessors (open access)

Model-Based, Memory-Centric Performance and Power Optimization on NUMA Multiprocessors

None
Date: October 8, 2012
Creator: Su, C Y; Li, D; Nikolopoulos, D S; Cameron, K W; de Supinski, B R & Leon, E A
System: The UNT Digital Library