Requirements for Defining Utility Drive Cycles: An Exploratory Analysis of Grid Frequency Regulation Data for Establishing Battery Performance Testing Standards (open access)

Requirements for Defining Utility Drive Cycles: An Exploratory Analysis of Grid Frequency Regulation Data for Establishing Battery Performance Testing Standards

Battery testing procedures are important for understanding battery performance, including degradation over the life of the battery. Standards are important to provide clear rules and uniformity to an industry. The work described in this report addresses the need for standard battery testing procedures that reflect real-world applications of energy storage systems to provide regulation services to grid operators. This work was motivated by the need to develop Vehicle-to-Grid (V2G) testing procedures, or V2G drive cycles. Likewise, the stationary energy storage community is equally interested in standardized testing protocols that reflect real-world grid applications for providing regulation services. As the first of several steps toward standardizing battery testing cycles, this work focused on a statistical analysis of frequency regulation signals from the Pennsylvania-New Jersey-Maryland Interconnect with the goal to identify patterns in the regulation signal that would be representative of the entire signal as a typical regulation data set. Results from an extensive time-series analysis are discussed, and the results are explained from both the statistical and the battery-testing perspectives. The results then are interpreted in the context of defining a small set of V2G drive cycles for standardization, offering some recommendations for the next steps toward standardizing testing protocols.
Date: October 19, 2011
Creator: Hafen, Ryan P.; Vishwanathan, Vilanyur V.; Subbarao, Krishnappa & Kintner-Meyer, Michael CW
Object Type: Report
System: The UNT Digital Library
Understanding Bulk Power Reliability: The Importance of Good Data and A Critical Review of Existing Sources (open access)

Understanding Bulk Power Reliability: The Importance of Good Data and A Critical Review of Existing Sources

Bulk power system reliability is of critical importance to the electricity sector. Complete and accurate information on events affecting the bulk power system is essential for assessing trends and efforts to maintain or improve reliability. Yet, current sources of this information were not designed with these uses in mind. They were designed, instead, to support real-time emergency notification to industry and government first-responders. This paper reviews information currently collected by both industry and government sources for this purpose and assesses factors that might affect their usefulness in supporting the academic literature that has relied upon them to draw conclusions about the reliability of the US electric power system.
Date: October 19, 2011
Creator: Fisher, Emily; Eto, Joseph H. & LaCommare, Kristina Hamachi
Object Type: Article
System: The UNT Digital Library
Determination of 235U/238U Ratio on Urine by ICP-MS (open access)

Determination of 235U/238U Ratio on Urine by ICP-MS

LLNL Internal Dosimetry Program - The new procedure satisfies the requirement to determine {sup 235}U/{sup 238}U ratio in bioassay urine samples. MDA - The L{sub C} and MDA{sub 95} for {sup 235}U are well below the required detection limit of 0.00035 {mu}g/L. Turn around time - Analysis of 10 samples plus 2 QCs can be completed in one work day (8 hours).
Date: October 19, 2011
Creator: Collins, L.; Gobaleza, A.; Langston, R.; Radev, R.; Than, C.; Wong, C. et al.
Object Type: Article
System: The UNT Digital Library
Hohlraum Designs for High Velocity Implosions on NIF (open access)

Hohlraum Designs for High Velocity Implosions on NIF

In this paper, we compare experimental shock and capsule trajectories to design calculations using the radiation-hydrodynamics code HYDRA. The measured trajectories from surrogate ignition targets are consistent with reducing the x-ray flux on the capsule by about 85%. A new method of extracting the radiation temperature as seen by the capsule from x-ray intensity and image data shows that about half of the apparent 15% flux deficit in the data with respect to the simulations can be explained by HYDRA overestimating the x-ray flux on the capsule. The National Ignition Campaign (NIC) point-design target is designed to reach a peak fuel-layer velocity of 370 km/s by ablating 90% of its plastic (CH) ablator. The 192-beam National Ignition Facility laser drives a gold hohlraum to a radiation temperature (T{sub RAD}) of 300 eV with a 20 ns-long, 420 TW, 1.3 MJ laser pulse. The hohlraum x-rays couple to the CH ablator in order to apply the required pressure to the outside of the capsule. In this paper, we compare experimental measurements of the hohlraum T{sub RAD} and the implosion trajectory with design calculations using the code hydra. The measured radial positions of the leading shock wave and the unablated shell are …
Date: October 19, 2011
Creator: Meezan, N. B.; Hicks, D. G.; Callahan, D. A.; Olson, R. E.; Schneider, M. S.; Thomas, C. A. et al.
Object Type: Article
System: The UNT Digital Library
POTENTIAL BENCHMARKS FOR ACTINIDE PRODUCTION IN HANFORD REACTORS (open access)

POTENTIAL BENCHMARKS FOR ACTINIDE PRODUCTION IN HANFORD REACTORS

A significant experimental program was conducted in the early Hanford reactors to understand the reactor production of actinides. These experiments were conducted with sufficient rigor, in some cases, to provide useful information that can be utilized today in development of benchmark experiments that may be used for the validation of present computer codes for the production of these actinides in low enriched uranium fuel.
Date: October 19, 2011
Creator: RJ, PUIGH & H, TOFFER
Object Type: Report
System: The UNT Digital Library
Energy Efficient Removal of Volatile Organic Compounds (VOCs) and Organic Hazardous Air Pollutants (o-HAPs) from Industrial Waste Streams by Direct Electron Oxidation (open access)

Energy Efficient Removal of Volatile Organic Compounds (VOCs) and Organic Hazardous Air Pollutants (o-HAPs) from Industrial Waste Streams by Direct Electron Oxidation

This research program investigated and quantified the capability of direct electron beam destruction of volatile organic compounds and organic hazardous air pollutants in model industrial waste streams and calculated the energy savings that would be realized by the widespread adoption of the technology over traditional pollution control methods. Specifically, this research determined the quantity of electron beam dose required to remove 19 of the most important non-halogenated air pollutants from waste streams and constructed a technical and economic model for the implementation of the technology in key industries including petroleum refining, organic & solvent chemical production, food & beverage production, and forest & paper products manufacturing. Energy savings of 75 - 90% and green house gas reductions of 66 - 95% were calculated for the target market segments.
Date: October 19, 2011
Creator: Testoni, A. L.
Object Type: Report
System: The UNT Digital Library
Oximes as Inhibitors of Acetylcholinesterase: A Structure Activity Relationship Study (open access)

Oximes as Inhibitors of Acetylcholinesterase: A Structure Activity Relationship Study

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Date: October 19, 2011
Creator: Sepsova, V.; Karasova, J.; Zemek, F.; Bennion, B. & Kuca, K.
Object Type: Article
System: The UNT Digital Library