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Year
Month
Day
Final Report for "Cloud-Aerosol Physics in Super-Parameterized Atmospheric Regional Climate Simulations (CAP-SPARCS)" (DE-SC0002003) for 8/15/2009 through 8/14/2012
Improving the representation of local and non-local aerosol interactions in state-of-the-science regional climate models is a priority for the coming decade (Zhang, 2008). With this aim in mind, we have combined two new technologies that have a useful synergy: (1) an aerosol-enabled regional climate model (Advanced Weather Research and Forecasting Model with Chemistry WRF-Chem), whose primary weakness is a lack of high quality boundary conditions and (2) an aerosol-enabled multiscale modeling framework (PNNL Multiscale Aerosol Climate Model (MACM)), which is global but captures aerosol-convection-cloud feedbacks, and thus an ideal source of boundary conditions. Combining these two approaches has resulted in an aerosol-enabled modeling framework that not only resolves high resolution details in a particular region, but crucially does so within a global context that is similarly faithful to multi-scale aerosol-climate interactions. We have applied and improved the representation of aerosol interactions by evaluating model performance over multiple domains, with (1) an extensive evaluation of mid-continent precipitation representation by multiscale modeling, (2) two focused comparisons to transport of aerosol plumes to the eastern United States for comparison with observations made as part of the International Consortium for Atmospheric Research on Transport and Transformation (ICARTT), with the first being idealized and the …
Date:
November 5, 2012
Creator:
Russell, Lynn M. & Somerville, Richard C. J.
Object Type:
Report
System:
The UNT Digital Library
The United States Support Program and IAEA Safeguards
N/A
Date:
October 5, 2012
Creator:
E., Pepper S.
Object Type:
Article
System:
The UNT Digital Library
A NEW ALGORITHM FOR RADIOISOTOPE IDENTIFICATION OF SHIELDED AND MASKED SNM/RDD MATERIALS
Detection and identification of shielded and masked nuclear materials is crucial to national security, but vast borders and high volumes of traffic impose stringent requirements for practical detection systems. Such tools must be be mobile, and hence low power, provide a low false alarm rate, and be sufficiently robust to be operable by non-technical personnel. Currently fielded systems have not achieved all of these requirements simultaneously. Transport modeling such as that done in GADRAS is able to predict observed spectra to a high degree of fidelity; our research is focusing on a radionuclide identification algorithm that inverts this modeling within the constraints imposed by a handheld device. Key components of this work include incorporation of uncertainty as a function of both the background radiation estimate and the hypothesized sources, dimensionality reduction, and nonnegative matrix factorization. We have partially evaluated performance of our algorithm on a third-party data collection made with two different sodium iodide detection devices. Initial results indicate, with caveats, that our algorithm performs as good as or better than the on-board identification algorithms. The system developed was based on a probabilistic approach with an improved approach to variance modeling relative to past work. This system was chosen based …
Date:
June 5, 2012
Creator:
Jeffcoat, R.
Object Type:
Article
System:
The UNT Digital Library
Beyond DVFS: A First Look at Performance Under a Hardware-Enforced Power Bound
None
Date:
March 5, 2012
Creator:
Rountree, B. R.; Ahn, D. H.; de Supinski, B. R.; Lowenthal, D. K. & Schulz, M.
Object Type:
Article
System:
The UNT Digital Library
High-Average Power Facilities
There has been significant progress in the development of high-power facilities in recent years yet major challenges remain. The task of WG4 was to identify which facilities were capable of addressing the outstanding R&D issues presently preventing high-power operation. To this end, information from each of the facilities represented at the workshop was tabulated and the results are presented herein. A brief description of the major challenges is given, but the detailed elaboration can be found in the other three working group summaries.
Date:
September 5, 2012
Creator:
Dowell, David H. & Power, John G.
Object Type:
Article
System:
The UNT Digital Library
Post-growth annealing to improve the performance of CdZnTe detectors
N/A
Date:
June 5, 2012
Creator:
G., Yang
Object Type:
Article
System:
The UNT Digital Library
LLNL Chronic Beryllium Disease Prevention Program 10 CFR 850 Requirements Flowdown
None
Date:
January 5, 2012
Creator:
Lee, S.
Object Type:
Report
System:
The UNT Digital Library
Fusion Simulation Program Definition. Final report
We have completed our contributions to the Fusion Simulation Program Definition Project. Our contributions were in the overall planning with concentration in the definition of the area of Software Integration and Support. We contributed to the planning of multiple meetings, and we contributed to multiple planning documents.
Date:
September 5, 2012
Creator:
Cary, John R.
Object Type:
Report
System:
The UNT Digital Library
A Hierarchical Approach for Load Balancing on Parallel Multi-core Systems
None
Date:
March 5, 2012
Creator:
Pilla, L L; Ribeiro, C P; Cordeiro, D; Mei, C; Bhatele, A; Navaux, P A et al.
Object Type:
Article
System:
The UNT Digital Library
RAPID METHOD FOR DETERMINATION OF {sup 228}Ra IN WATER SAMPLES
A new rapid method for the determination of {sup 228}Ra in natural water samples has been developed at the SRNL/EBL (Savannah River National Lab/ Environmental Bioassay Laboratory) that can be used for emergency response or routine samples. While gamma spectrometry can be employed with sufficient detection limits to determine {sup 228}Ra in solid samples (via {sup 228}Ac) , radiochemical methods that employ gas flow proportional counting techniques typically provide lower MDA (Minimal Detectable Activity) levels for the determination of {sup 228}Ra in water samples. Most radiochemical methods for {sup 228}Ra collect and purify {sup 228}Ra and allow for {sup 228}Ac daughter ingrowth for ~36 hours. In this new SRNL/EBL approach, {sup 228}Ac is collected and purified from the water sample without waiting to eliminate this delay. The sample preparation requires only about 4 hours so that {sup 228}Ra assay results on water samples can be achieved in < 6 hours. The method uses a rapid calcium carbonate precipitation enhanced with a small amount of phosphate added to enhance chemical yields (typically >90%), followed by rapid cation exchange removal of calcium. Lead, bismuth, uranium, thorium and protactinium isotopes are also removed by the cation exchange separation. {sup 228}Ac is eluted from …
Date:
September 5, 2012
Creator:
Maxwell, S.
Object Type:
Article
System:
The UNT Digital Library
Final Technical Report
This is the final report for the Research Grant DE-FG02-08ER54989 'Edge Plasma Simulations in NSTX and CTF: Synergy of Lithium Coating, Non-Diffusive Anomalous Transport and Drifts'. The UCSD group including: A.Yu. Pigarov (PI), S.I. Krasheninnikov and R.D. Smirnov, was working on modeling of the impact of lithium coatings on edge plasma parameters in NSTX with the multi-species multi-fluid code UEDGE. The work was conducted in the following main areas: (i) improvements of UEDGE model for plasma-lithium interactions, (ii) understanding the physics of low-recycling divertor regime in NSTX caused by lithium pumping, (iii) study of synergistic effects with lithium coatings and non-diffusive ballooning-like cross-field transport, (iv) simulation of experimental multi-diagnostic data on edge plasma with lithium pumping in NSTX via self-consistent modeling of D-Li-C plasma with UEDGE, and (v) working-gas balance analysis. The accomplishments in these areas are given in the corresponding subsections in Section 2. Publications and presentations made under the Grant are listed in Section 3.
Date:
June 5, 2012
Creator:
Pigarov, Alexander
Object Type:
Report
System:
The UNT Digital Library
Source fabrication and lifetime for Li+ ion beams extracted from alumino-silicate sources
A space-charge-limited beam with current densities (J) exceeding 1 mA/cm{sup 2} have been measured from lithium alumino-silicate ion sources at a temperature of #24;~1275#14;{degrees} C. At higher extraction voltages, the source appears to become emission limited with J #21;{>=} 1.5 mA/cm{sup 2}, and J increases weakly with the applied voltage. A 6.35 mm diameter source with an alumino-silicate coating, {<=}#20;0.25 mm thick, has a measured lifetime of ~#24;40 hours at ~#24;1275#14;{degrees} C, when pulsed at 0.05 Hz and with pulse length of #24;~6 &#956;s each. At this rate, the source lifetime was independent of the actual beam charge extracted due to the loss of neutral atoms at high temperature. The source lifetime increases with the amount of alumino-silicate coated on the emitting surface, and may also be further extended if the temperature is reduced between pulses.
Date:
March 5, 2012
Creator:
Roy, Prabir K.; Greenway, Wayne G. & Kwan, Joe W
Object Type:
Article
System:
The UNT Digital Library
Recent RHIC In-Situ Coating Technology Developments
N/A
Date:
June 5, 2012
Creator:
Hershcovitch, A.; Blaskiewicz, M.; Brennan, J. M.; Chawla, A.; Custer, A.; Erickson, M. et al.
Object Type:
Article
System:
The UNT Digital Library
G-Band Vapor Radiometer Precipitable Water Vapor (GVRPWV) Value-Added Product
The G-Band Vapor Radiometer Precipitable Water Vapor (GVRPWV) value-added product (VAP) computes precipitable water vapor using neural network techniques from data measured by the GVR. The GVR reports time-series measurements of brightness temperatures for four channels located at 183.3 ± 1, 3, 7, and 14 GHz.
Date:
December 5, 2012
Creator:
Koontz, A & Cadeddu, M
Object Type:
Report
System:
The UNT Digital Library
A Superconducting Magnet Upgrade of the ATF2 Final Focus
The ATF2 facility at KEK is a proving ground for linear collider technology with a well instrumented extracted beam line and Final Focus (FF). The primary ATF2 goal is to demonstrate the extreme beam demagnification and spot stability needed for a linear collider FF. But the ATF2 FF uses water cooled magnets and the ILC baseline has a superconducting (SC) FF. We plan to upgrade ATF2 and replace some of the warm FF magnets with SC FF magnets. The ATF2 SC magnets, like the ILC FF, will made via direct wind construction. ATF2 coil winding is in progress at BNL and warm magnetic measurements indicate we have achieved good field quality. Studies indicate that having ATF2 FF magnets with larger aperture and better field quality should allow reducing the ATF2 FF beta function for study of focusing regimes relevant to CLIC. The ATF2 magnet cryostat will have laser view ports for directly monitoring cold mass movement. We plan to make stability measurements at BNL and KEK to relate ATF2 FF magnet performance to that of a full length ILC QD0 R&D FF prototype under construction at BNL.
Date:
July 5, 2012
Creator:
Parker, Brett; /Brookhaven; Anerella, Michael; /Brookhaven; Escallier, John; /Brookhaven et al.
Object Type:
Article
System:
The UNT Digital Library
Yorktown News-View (Yorktown, Tex.), Vol. 121, No. 20, Ed. 1 Wednesday, December 5, 2012
Weekly newspaper from Yorktown, Texas that includes local, state, and national news along with advertising.
Date:
December 5, 2012
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Jack County Herald (Jacksboro, Tex.), Vol. 67, No. 19, Ed. 1 Friday, October 5, 2012
Weekly newspaper from Jacksboro, Texas that includes local, state, and national news along with advertising.
Date:
October 5, 2012
Creator:
Hudson, Pam
Object Type:
Newspaper
System:
The Portal to Texas History
Electra Star-News (Electra, Tex.), Vol. 105, No. 21, Ed. 1 Thursday, January 5, 2012
Weekly newspaper from Electra, Texas that includes local, state, and national news along with advertising.
Date:
January 5, 2012
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Electra Star-News (Electra, Tex.), Vol. 105, No. 34, Ed. 1 Thursday, April 5, 2012
Weekly newspaper from Electra, Texas that includes local, state, and national news along with advertising.
Date:
April 5, 2012
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Sweetwater Reporter (Sweetwater, Tex.), Vol. 114, No. 276, Ed. 1 Wednesday, December 5, 2012
Daily newspaper from Sweetwater, Texas that includes local, state, and national news along with advertising.
Date:
December 5, 2012
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Sweetwater Reporter (Sweetwater, Tex.), Vol. 114, No. 250, Ed. 1 Monday, November 5, 2012
Daily newspaper from Sweetwater, Texas that includes local, state, and national news along with advertising.
Date:
November 5, 2012
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Sweetwater Reporter (Sweetwater, Tex.), Vol. 114, No. 224, Ed. 1 Friday, October 5, 2012
Daily newspaper from Sweetwater, Texas that includes local, state, and national news along with advertising.
Date:
October 5, 2012
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Olney Enterprise (Olney, Tex.), Vol. 104, No. 5, Ed. 1 Thursday, April 5, 2012
Weekly newspaper from Olney, Texas that includes local, state, and national news along with advertising.
Date:
April 5, 2012
Creator:
Kimbro, Mindi
Object Type:
Newspaper
System:
The Portal to Texas History
[Minutes: The Dallas Way, June 5, 2012]
Minutes for the June 5, 2012 meeting of the Dallas Way including a list of reports and project updates.
Date:
June 5, 2012
Creator:
The Dallas Way
Object Type:
Text
System:
The UNT Digital Library