National Library of Energy BETA

Sample records for large scale wind

  1. POWER SYSTEMS STABILITY WITH LARGE-SCALE WIND POWER PENETRATION

    E-Print Network [OSTI]

    Bak-Jensen, Birgitte

    of offshore wind farms, wind power fluctuations may introduce several challenges to reliable power system behaviour due to natural wind fluctuations. The rapid power fluctuations from the large scale wind farms Generation Control (AGC) system which includes large- scale wind farms for long-term stability simulation

  2. Large-Scale Wind Training Program

    SciTech Connect (OSTI)

    Porter, Richard L. [Hudson Valley Community College

    2013-07-01

    Project objective is to develop a credit-bearing wind technician program and a non-credit safety training program, train faculty, and purchase/install large wind training equipment.

  3. Superconductivity for Large Scale Wind Turbines

    SciTech Connect (OSTI)

    R. Fair; W. Stautner; M. Douglass; R. Rajput-Ghoshal; M. Moscinski; P. Riley; D. Wagner; J. Kim; S. Hou; F. Lopez; K. Haran; J. Bray; T. Laskaris; J. Rochford; R. Duckworth

    2012-10-12

    A conceptual design has been completed for a 10MW superconducting direct drive wind turbine generator employing low temperature superconductors for the field winding. Key technology building blocks from the GE Wind and GE Healthcare businesses have been transferred across to the design of this concept machine. Wherever possible, conventional technology and production techniques have been used in order to support the case for commercialization of such a machine. Appendices A and B provide further details of the layout of the machine and the complete specification table for the concept design. Phase 1 of the program has allowed us to understand the trade-offs between the various sub-systems of such a generator and its integration with a wind turbine. A Failure Modes and Effects Analysis (FMEA) and a Technology Readiness Level (TRL) analysis have been completed resulting in the identification of high risk components within the design. The design has been analyzed from a commercial and economic point of view and Cost of Energy (COE) calculations have been carried out with the potential to reduce COE by up to 18% when compared with a permanent magnet direct drive 5MW baseline machine, resulting in a potential COE of 0.075 $/kWh. Finally, a top-level commercialization plan has been proposed to enable this technology to be transitioned to full volume production. The main body of this report will present the design processes employed and the main findings and conclusions.

  4. Wind Scanner: A full-scale Laser Facility for Wind and Turbulence Measurements around large Wind Turbines

    E-Print Network [OSTI]

    Wind Scanner: A full-scale Laser Facility for Wind and Turbulence Measurements around large Wind Turbines Torben Mikkelsen, Jakob Mann and Michael Courtney Wind Energy Department, Risø National Laboratory:Torben.Mikkelsen@Risoe.dk Summary RISØ DTU has started to build a newly designed laser-based lidar scanning facility for remote wind

  5. Large-scale structure of the fast solar wind

    E-Print Network [OSTI]

    Bisi, M. M.; Fallows, R. A.; Breen, A. R.; Habbal, S. Rifai; Jones, R. A.

    2007-01-01

    to detect small variations in the fast solar wind struc-small-scale (?100 km) density variations in the solar wind.small step in density seen in the Ulysses data indicated the presence of two modes of fast wind,

  6. Aalborg Universitet Optimal Selection of AC Cables for Large Scale Offshore Wind Farms

    E-Print Network [OSTI]

    Hu, Weihao

    Aalborg Universitet Optimal Selection of AC Cables for Large Scale Offshore Wind Farms Hou, Peng Cables for Large Scale Offshore Wind Farms. In Proceedings of the 40th Annual Conference of IEEE of AC Cables for Large Scale Offshore Wind Farms Peng Hou, Weihao Hu, Zhe Chen Department of Energy

  7. The influence of large-scale wind power on global climate

    E-Print Network [OSTI]

    Barlaz, Morton A.

    The influence of large-scale wind power on global climate David W. Keith* , Joseph F. De, CA, September 19, 2004 (received for review April 16, 2004) Large-scale use of wind power can alter of wind power at regional to global scales by using two general circulation models and several

  8. Potential Climatic Impacts and Reliability of Very Large-Scale Wind Farms

    E-Print Network [OSTI]

    Wang, Chien

    Meeting future world energy needs while addressing climate change requires large-scale deployment of low or zero greenhouse gas (GHG) emission technologies such as wind energy. The widespread availability of wind power has ...

  9. Large-scale Offshore Wind Power in the United States. Assessment of Opportunities and Barriers

    SciTech Connect (OSTI)

    Musial, Walter; Ram, Bonnie

    2010-09-01

    This report describes the benefits of and barriers to large-scale deployment of offshore wind energy systems in U.S. waters.

  10. Effects of large-scale distribution of wind energy in and around Europe

    E-Print Network [OSTI]

    Effects of large-scale distribution of wind energy in and around Europe Gregor Giebel Niels Gylling Mortensen Risø National Laboratory Gregor Czisch ISET #12;Outline · How to achieve high penetrations of wind energy in Europe? · Distribution of wind energy all over Europe leads to smoothing of the wind power

  11. Fourth International Workshop on Large-Scale Integration of Wind Power and Transmission Networks for Offshore Wind Farms,

    E-Print Network [OSTI]

    for Offshore Wind Farms, 20-21 October 2003, Billund, Denmark C. S. Nielsen, Hans F. Ravn, Camilla Schaumburg1 Fourth International Workshop on Large-Scale Integration of Wind Power and Transmission Networks of Denmark, B. 321, DK-2800 Lyngby, Denmark, csm@imm.dtu.dk Two wind power prognosis criteria and regulating

  12. Aalborg Universitet Impact of Wind Shear and Tower Shadow Effects on Power System with Large Scale

    E-Print Network [OSTI]

    Hu, Weihao

    @et.aau.dk, csu@et.aau.dk, zch@et.aau.dk Abstract ­ Grid connected wind turbines are fluctuating power sources due and the power flow situation of the original power system especially when the integration of wind powerAalborg Universitet Impact of Wind Shear and Tower Shadow Effects on Power System with Large Scale

  13. Energy Policy 34 (2006) 395410 The economics of large-scale wind power in a carbon

    E-Print Network [OSTI]

    Barlaz, Morton A.

    2006-01-01

    Energy Policy 34 (2006) 395­410 The economics of large-scale wind power in a carbon constrained to supplement variable wind power output to meet a time-varying load. We find that, with somewhat optimistic cost of delivered wind power. Due to residual CO2 emissions, compressed air storage is surprisingly

  14. "Biomaterials for Use in Large Scale Wind Turbine Blades" Malia Charter

    E-Print Network [OSTI]

    Mountziaris, T. J.

    "Biomaterials for Use in Large Scale Wind Turbine Blades" Malia Charter Advising: Rachel Koh, Dr into the feasibility of using biocomposites for wind turbine blades. While bast fiber composites are also being Peggi Clouston Wind energy is growing rapidly to address concerns of non-renewable energy resources. One

  15. The Association of Large-Scale Climate Variability and Teleconnections on Wind Energy Resource

    E-Print Network [OSTI]

    The Association of Large-Scale Climate Variability and Teleconnections on Wind Energy Resource over on Wind Energy Resource over Europe and its Intermittency Pascal Kriesche* and Adam Schlosser* Abstract In times of increasing importance of wind power in the world's energy mix, this study focuses on a better

  16. The emergence of zonal ocean jets under large-scale stochastic wind forcing

    E-Print Network [OSTI]

    LaCasce, Joseph H.

    . But we will show how such forcing can in fact generate zonal jet-like structures. [5] Wind forcingThe emergence of zonal ocean jets under large-scale stochastic wind forcing Christopher H. O stochastic wind forcing is investigated. As found in many previous studies, long Rossby waves are excited

  17. Large-scale structure of the fast solar wind

    E-Print Network [OSTI]

    Bisi, M. M.; Fallows, R. A.; Breen, A. R.; Habbal, S. Rifai; Jones, R. A.

    2007-01-01

    measurements of Solar Wind velocity, in press, Journal of1992), The Ulysses solar wind plasma experiment, AstronomyA. Hewish (1967), The solar wind outside the plane of the

  18. Large-scale structure of the fast solar wind

    E-Print Network [OSTI]

    Bisi, M. M.; Fallows, R. A.; Breen, A. R.; Habbal, S. Rifai; Jones, R. A.

    2007-01-01

    Scintillation measurements of Solar Wind velocity, in press,K. Sakurai (1992), The Ulysses solar wind plasma experiment,Telescope for the SOHO Mission, Solar Physics, 162, 291–312.

  19. Large Scale Wind and Solar Integration in Germany

    SciTech Connect (OSTI)

    Ernst, Bernhard; Schreirer, Uwe; Berster, Frank; Pease, John; Scholz, Cristian; Erbring, Hans-Peter; Schlunke, Stephan; Makarov, Yuri V.

    2010-02-28

    This report provides key information concerning the German experience with integrating of 25 gigawatts of wind and 7 gigawatts of solar power capacity and mitigating its impacts on the electric power system. The report has been prepared based on information provided by the Amprion GmbH and 50Hertz Transmission GmbH managers and engineers to the Bonneville Power Administration (BPA) and Pacific Northwest National Laboratory representatives during their visit to Germany in October 2009. The trip and this report have been sponsored by the BPA Technology Innovation office. Learning from the German experience could help the Bonneville Power Administration engineers to compare and evaluate potential new solutions for managing higher penetrations of wind energy resources in their control area. A broader dissemination of this experience will benefit wind and solar resource integration efforts in the United States.

  20. Prospects for large scale applications of wind energy

    E-Print Network [OSTI]

    generating wind turbine (1885) Historical development #12;20th century: first electricity generation USA development #12;After 1500: development of the horizontal axis mills La Cour, Askov (DK): First electricity: electricity generation DK: Gedser (1975) NL: De Traanroeier (1956) D: Hütter (1959) Historical development #12

  1. Mars as a comet: Solar wind interaction on a large scale

    E-Print Network [OSTI]

    Holmstrom, Mats

    2015-01-01

    Looking at the Mars-solar wind interaction on a larger spatial scale than the near Mars region, the planet can be seen as an ion source interacting with the solar wind, in many ways like a comet, but with a smaller ion source region. Here we study the interaction between Mars and the solar wind using a hybrid model (particle ions and fluid electrons). We find that the solar wind is disturbed by Mars out to 100 Mars radii downstream of the planet, and beyond. On this large scale it is clear that the escaping ions can be classified into two different populations. A polar plume of ions picked-up by the solar wind, and a more fluid outflow of ions behind the planet. The outflow increases linear with the production up to levels of observed outflow rates, then the escape levels off for higher production rates.

  2. The Association of Large-Scale Climate Variability and Teleconnections on Wind Energy Resource over Europe and its Intermittency

    E-Print Network [OSTI]

    Kriesche, Pascal

    In times of increasing importance of wind power in the world’s energy mix, this study focuses on a better understanding of the influences of large-scale climate variability on wind power resource over Europe. The impact ...

  3. Large scale risk-assessment of wind-farms on population viability of a globally endangered long-lived raptor

    E-Print Network [OSTI]

    Carrete, Martina

    Large scale risk-assessment of wind-farms on population viability of a globally endangered long percnopterus Wind-farm Long-lived species Population viability analysis a b s t r a c t Wind-farms receive, they can have adverse effects on wildlife, particularly through collision with turbines. Research on wind-farm

  4. Evidence of Early Enrichment of the Galactic Disk by Large-Scale Winds

    E-Print Network [OSTI]

    Tsujimoto, T; Freeman, K C

    2010-01-01

    Large-scale homogeneous surveys of Galactic stars may indicate that the elemental abundance gradient evolves with cosmic time, a phenomenon that was not foreseen in existing models of Galactic chemical evolution (GCE). If the phenomenon is confirmed in future studies, we show that this effect, at least in part, is due to large-scale winds that once enriched the disk. These set up the steep abundance gradient in the inner disk (R <14 kpc). At the close of the wind phase, chemical enrichment through accretion of metal-poor material from the halo onto the disk gradually reduced the metallicity of the inner region, whereas a slow increase in the metallicity proceeded beyond the solar circle. Our "wind+infall" model accounts for flattening of the abundance gradient in the inner disk, in good agreement with observations. Accordingly, we propose that enrichment by large-scale winds is a crucial factor for chemical evolution in the disk. We anticipate that rapid flattening of the abundance gradient is the hallmark...

  5. Generation of large-scale gravity waves and neutral winds in the thermosphere from the dissipation of convectively

    E-Print Network [OSTI]

    Vadas, Sharon

    Generation of large-scale gravity waves and neutral winds in the thermosphere from the dissipation: Vadas, S. L., and H. Liu (2009), Generation of large-scale gravity waves and neutral winds of convectively generated gravity waves Sharon L. Vadas1 and Han-li Liu2 Received 29 January 2009; accepted 11

  6. ARRA-Multi-Level Energy Storage and Controls for Large-Scale Wind Energy Integration

    SciTech Connect (OSTI)

    David Wenzhong Gao

    2012-09-30

    The Project Objective is to design innovative energy storage architecture and associated controls for high wind penetration to increase reliability and market acceptance of wind power. The project goals are to facilitate wind energy integration at different levels by design and control of suitable energy storage systems. The three levels of wind power system are: Balancing Control Center level, Wind Power Plant level, and Wind Power Generator level. Our scopes are to smooth the wind power fluctuation and also ensure adequate battery life. In the new hybrid energy storage system (HESS) design for wind power generation application, the boundary levels of the state of charge of the battery and that of the supercapacitor are used in the control strategy. In the controller, some logic gates are also used to control the operating time durations of the battery. The sizing method is based on the average fluctuation of wind profiles of a specific wind station. The calculated battery size is dependent on the size of the supercapacitor, state of charge of the supercapacitor and battery wear. To accommodate the wind power fluctuation, a hybrid energy storage system (HESS) consisting of battery energy system (BESS) and super-capacitor is adopted in this project. A probability-based power capacity specification approach for the BESS and super-capacitors is proposed. Through this method the capacities of BESS and super-capacitor are properly designed to combine the characteristics of high energy density of BESS and the characteristics of high power density of super-capacitor. It turns out that the super-capacitor within HESS deals with the high power fluctuations, which contributes to the extension of BESS lifetime, and the super-capacitor can handle the peaks in wind power fluctuations without the severe penalty of round trip losses associated with a BESS. The proposed approach has been verified based on the real wind data from an existing wind power plant in Iowa. An intelligent controller that increases battery life within hybrid energy storage systems for wind application was developed. Comprehensive studies have been conducted and simulation results are analyzed. A permanent magnet synchronous generator, coupled with a variable speed wind turbine, is connected to a power grid (14-bus system). A rectifier, a DC-DC converter and an inverter are used to provide a complete model of the wind system. An Energy Storage System (ESS) is connected to a DC-link through a DC-DC converter. An intelligent controller is applied to the DC-DC converter to help the Voltage Source Inverter (VSI) to regulate output power and also to control the operation of the battery and supercapacitor. This ensures a longer life time for the batteries. The detailed model is simulated in PSCAD/EMTP. Additionally, economic analysis has been done for different methods that can reduce the wind power output fluctuation. These methods are, wind power curtailment, dumping loads, battery energy storage system and hybrid energy storage system. From the results, application of single advanced HESS can save more money for wind turbines owners. Generally the income would be the same for most of methods because the wind does not change and maximum power point tracking can be applied to most systems. On the other hand, the cost is the key point. For short term and small wind turbine, the BESS is the cheapest and applicable method while for large scale wind turbines and wind farms the application of advanced HESS would be the best method to reduce the power fluctuation. The key outcomes of this project include a new intelligent controller that can reduce energy exchanged between the battery and DC-link, reduce charging/discharging cycles, reduce depth of discharge and increase time interval between charge/discharge, and lower battery temperature. This improves the overall lifetime of battery energy storages. Additionally, a new design method based on probability help optimize the power capacity specification for BESS and super-capacitors. Recommendations include experimental imp

  7. Relative effects of wind stress curl, topography, and stratification on large-scale circulation in Lake Michigan

    E-Print Network [OSTI]

    Relative effects of wind stress curl, topography, and stratification on large-scale circulation, and stratification on large-scale circulation. The multiseason simulations provide a period long enough to encompass the full range of atmospheric and thermal conditions that can occur in the lake. The purpose of this paper

  8. Impact of Distribution-Connected Large-Scale Wind Turbines on Transmission System Stability during Large Disturbances: Preprint

    SciTech Connect (OSTI)

    Zhang, Y.; Allen, A.; Hodge, B. M.

    2014-02-01

    This work examines the dynamic impacts of distributed utility-scale wind power during contingency events on both the distribution system and the transmission system. It is the first step toward investigating high penetrations of distribution-connected wind power's impact on both distribution and transmission stability.

  9. Large-Scale Wind Integration Studies in the United States: Preliminary Results; Preprint

    SciTech Connect (OSTI)

    Milligan, M.; Lew, D.; Corbus, D.; Piwko, R.; Miller, N.; Clark, K.; Jordan, G.; Freeman, L.; Zavadil, B.; Schuerger, M.

    2009-09-01

    The National Renewable Energy Laboratory is managing two large regional wind integration studies on behalf of the United States Department of Energy. These two studies are believed to be the largest ever undertaken in the United States.

  10. Scale Models & Wind Turbines

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Turbines * Readings about Cape Wind and other offshore and onshore siting debates for wind farms * Student Worksheet * A number of scale model items: Ken, Barbie or other dolls...

  11. Techno-economic Modeling of the Integration of 20% Wind and Large-scale Energy Storage in ERCOT by 2030

    SciTech Connect (OSTI)

    Ross Baldick; Michael Webber; Carey King; Jared Garrison; Stuart Cohen; Duehee Lee

    2012-12-21

    This study�¢����s objective is to examine interrelated technical and economic avenues for the Electric Reliability Council of Texas (ERCOT) grid to incorporate up to and over 20% wind generation by 2030. Our specific interests are to look at the factors that will affect the implementation of both high level of wind power penetration (> 20% generation) and installation of large scale storage.

  12. Small Solar Wind Transients and Their Connection to the Large-Scale Coronal Structure

    E-Print Network [OSTI]

    2009-01-01

    AT SOLAR MINIMUM Small Solar Wind Transients and Theirinclude closed loops, Small Solar Wind Transients and Theirthe transient on Small Solar Wind Transients and Their

  13. Small Solar Wind Transients and Their Connection to the Large-Scale Coronal Structure

    E-Print Network [OSTI]

    2009-01-01

    I.G. : 2006, In situ solar wind and magnetic ?eld signaturesE. : 2008, The IMPACT Solar Wind Electron Analyzer (SWEA).Heliospheric images of the solar wind at Earth. Astrophys.

  14. ANEMOS: Development of a Next Generation Wind Power Forecasting System for the Large-Scale Integration of Onshore &

    E-Print Network [OSTI]

    Heinemann, Detlev

    -Scale Integration of Onshore & Offshore Wind Farms. G. Kariniotakis* , D. Mayer, J. Moussafir, R. Chevallaz-line operation at onshore and offshore wind farms for prediction at a local, regional and national scale, for onshore and offshore wind power forecasting, exploiting both statistical and physical modeling approaches

  15. Influence of large scale oscillations on upwelling-favorable coastal wind off central Chile

    E-Print Network [OSTI]

    Rahn, David A.

    2012-10-16

    Along the central coast of Chile is typically equatorward, upwelling-favorable wind associated with the southeast Pacific anticyclone. A coastal low-level jet often develops, and its wind speed is mostly controlled by the meridional pressure...

  16. Large-Scale Offshore Wind Power in the United States: Executive Summary

    SciTech Connect (OSTI)

    Musial, W.; Ram, B.

    2010-09-01

    This document provides a summary of a 236-page NREL report that provides a broad understanding of today's offshore wind industry, the offshore wind resource, and the associated technology challenges, economics, permitting procedures, and potential risks and benefits.

  17. Large-Scale Offshore Wind Power in the United States: Assessment of Opportunities and Barriers

    SciTech Connect (OSTI)

    Musial, W.; Ram, B.

    2010-09-01

    This paper assesses the potential for U.S. offshore wind to meet the energy needs of many coastal and Great Lakes states.

  18. VP 100: New Facility in Boston to Test Large-Scale Wind Blades

    Broader source: Energy.gov [DOE]

    Thanks in part to funding from the Recovery Act, the Wind Technology Testing Center in Massachusetts will be first in the U.S. to test wind turbine blades up to 300 feet in length -- creating 300 construction jobs and 30 permanent design jobs in the process.

  19. The role of hydroelectric generation in electric power systems with large scale wind generation

    E-Print Network [OSTI]

    Hagerty, John Michael

    2012-01-01

    An increasing awareness of the operational challenges created by intermittent generation of electricity from policy-mandated renewable resources, such as wind and solar, has led to increased scrutiny of the public policies ...

  20. Potential Climatic Impacts and Reliability of Large-Scale Offshore Wind Farms

    E-Print Network [OSTI]

    Wang, Chien

    The vast availability of wind power has fueled substantial interest in this renewable energy source as a potential near-zero greenhouse gas emission technology for meeting future world energy needs while addressing the ...

  1. Impacts of Large-Scale Wind Generators Penetration on the Voltage Stability of Power Systems

    E-Print Network [OSTI]

    Pota, Himanshu Roy

    on the operation of existing transmission network . The European Wind Energy Association (EWEA) projects 230 GW closer to their limits, using flexible AC transmission system devices (FACTS), and also due- rently interconnected into the existing transmission network of 220kV voltage level with higher installed

  2. Large Scale Wind Turbine Siting Map Report NJ Department of Environmental Protection

    E-Print Network [OSTI]

    Holberton, Rebecca L.

    , 2009 #12;Introduction This report documents the methodology and justification used to develop the New energy facilities located on land shall be sited such that no portion of the wind turbine(s), including and the Delaware Bayshore) were also identified on the Map. Along the Atlantic Coast corridor the rate of migrant

  3. Coupled Dynamic Analysis of Large-Scale Mono-Column Offshore Wind Turbine with a Single Tether Hinged in Seabed 

    E-Print Network [OSTI]

    Chen, Jieyan

    2012-10-19

    The increased interest in the offshore wind resource in both industry and academic and the extension of the wind field where offshore wind turbine can be deployed has stimulated quite a number of offshore wind turbines concepts. This thesis presents...

  4. Running Large Scale Jobs

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    try on their large scale applications on Hopper for better performance. Try different compilers and compiler options The available compilers on Hopper are PGI, Cray, Intel, GNU,...

  5. Large-Scale Uncertainty and Error Analysis for Time-dependent Fluid/Structure Interactions in Wind Turbine Applications

    SciTech Connect (OSTI)

    Alonso, Juan J. [Stanford University; Iaccarino, Gianluca [Stanford University

    2013-08-25

    The following is the final report covering the entire period of this aforementioned grant, June 1, 2011 - May 31, 2013 for the portion of the effort corresponding to Stanford University (SU). SU has partnered with Sandia National Laboratories (PI: Mike S. Eldred) and Purdue University (PI: Dongbin Xiu) to complete this research project and this final report includes those contributions made by the members of the team at Stanford. Dr. Eldred is continuing his contributions to this project under a no-cost extension and his contributions to the overall effort will be detailed at a later time (once his effort has concluded) on a separate project submitted by Sandia National Laboratories. At Stanford, the team is made up of Profs. Alonso, Iaccarino, and Duraisamy, post-doctoral researcher Vinod Lakshminarayan, and graduate student Santiago Padron. At Sandia National Laboratories, the team includes Michael Eldred, Matt Barone, John Jakeman, and Stefan Domino, and at Purdue University, we have Prof. Dongbin Xiu as our main collaborator. The overall objective of this project was to develop a novel, comprehensive methodology for uncertainty quantification by combining stochastic expansions (nonintrusive polynomial chaos and stochastic collocation), the adjoint approach, and fusion with experimental data to account for aleatory and epistemic uncertainties from random variable, random field, and model form sources. The expected outcomes of this activity were detailed in the proposal and are repeated here to set the stage for the results that we have generated during the time period of execution of this project: 1. The rigorous determination of an error budget comprising numerical errors in physical space and statistical errors in stochastic space and its use for optimal allocation of resources; 2. A considerable increase in efficiency when performing uncertainty quantification with a large number of uncertain variables in complex non-linear multi-physics problems; 3. A solution to the long-time integration problem of spectral chaos approaches; 4. A rigorous methodology to account for aleatory and epistemic uncertainties, to emphasize the most important variables via dimension reduction and dimension-adaptive refinement, and to support fusion with experimental data using Bayesian inference; 5. The application of novel methodologies to time-dependent reliability studies in wind turbine applications including a number of efforts relating to the uncertainty quantification in vertical-axis wind turbine applications. In this report, we summarize all accomplishments in the project (during the time period specified) focusing on advances in UQ algorithms and deployment efforts to the wind turbine application area. Detailed publications in each of these areas have also been completed and are available from the respective conference proceedings and journals as detailed in a later section.

  6. Abstract--As a common tendency, large-scale wind farms are increasingly connected to the transmission system of modern

    E-Print Network [OSTI]

    Chen, Zhe

    include [1, 2]: · Under normal conditions: Frequency and voltage ranges Active power regulation and frequency control Reactive power regulation and voltage control · Under disturbance conditions: Voltage ride regulation. For variable-speed wind turbines which are connected to the power system through power electronic

  7. Large-Scale Offshore Wind Power in the United States: Assessment of Opportunities and Barriers, NREL (National Renewable Energy Laboratory)

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration would likeUniverseIMPACTThousand CubicResourcelogo and mastheadLakeLanguage Offshore Wind Power

  8. Large-scale environments of binary AGB stars probed by Herschel. II: Two companions interacting with the wind of pi1 Gruis

    E-Print Network [OSTI]

    Mayer, A; Paladini, C; Kerschbaum, F; Pourbaix, D; Siopis, C; Ottensamer, R; Me?ina, M; Cox, N L J; Groenewegen, M A T; Klotz, D; Sadowski, G; Spang, A; Cruzalèbes, P; Waelkens, C

    2014-01-01

    Context. The Mass loss of Evolved StarS (MESS) sample observed with PACS on board the Herschel Space Observatory revealed that several asymptotic giant branch (AGB) stars are surrounded by an asymmetric circumstellar envelope (CSE) whose morphology is most likely caused by the interaction with a stellar companion. The evolution of AGB stars in binary systems plays a crucial role in understanding the formation of asymmetries in planetary nebul{\\ae} (PNe), but at present, only a handful of cases are known where the interaction of a companion with the stellar AGB wind is observed. Aims. We probe the environment of the very evolved AGB star $\\pi^1$ Gruis on large and small scales to identify the triggers of the observed asymmetries. Methods. Observations made with Herschel/PACS at 70 $\\mu$m and 160 $\\mu$m picture the large-scale environment of $\\pi^1$ Gru. The close surroundings of the star are probed by interferometric observations from the VLTI/AMBER archive. An analysis of the proper motion data of Hipparcos a...

  9. learn invent impact Design of Large Scale

    E-Print Network [OSTI]

    McCalley, James D.

    learn invent impact Design of Large Scale Permanent Magnet Synchronous Generators for Wind Turbines.iastate.edu Permanent Magnet Synchronous Generators (PMSGs) Source: http://www.digikey.com/en-US/articles/techzone/2012of% 20PM_Generator_RPI_Qu_v8.pdf Permanent Magnet Synchronous Generators Rotor PMDD Generator Full

  10. Meteorological aspects of siting large wind turbines

    SciTech Connect (OSTI)

    Hiester, T.R.; Pennell, W.T.

    1981-01-01

    This report, which focuses on the meteorological aspects of siting large wind turbines (turbines with a rated output exceeding 100 kW), has four main goals. The first is to outline the elements of a siting strategy that will identify the most favorable wind energy sites in a region and that will provide sufficient wind data to make responsible economic evaluations of the site wind resource possible. The second is to critique and summarize siting techniques that were studied in the Department of Energy (DOE) Wind Energy Program. The third goal is to educate utility technical personnel, engineering consultants, and meteorological consultants (who may have not yet undertaken wind energy consulting) on meteorological phenomena relevant to wind turbine siting in order to enhance dialogues between these groups. The fourth goal is to minimize the chances of failure of early siting programs due to insufficient understanding of wind behavior.

  11. Large scale tracking algorithms.

    SciTech Connect (OSTI)

    Hansen, Ross L.; Love, Joshua Alan; Melgaard, David Kennett; Karelitz, David B.; Pitts, Todd Alan; Zollweg, Joshua David; Anderson, Dylan Z.; Nandy, Prabal; Whitlow, Gary L.; Bender, Daniel A.; Byrne, Raymond Harry

    2015-01-01

    Low signal-to-noise data processing algorithms for improved detection, tracking, discrimination and situational threat assessment are a key research challenge. As sensor technologies progress, the number of pixels will increase signi cantly. This will result in increased resolution, which could improve object discrimination, but unfortunately, will also result in a significant increase in the number of potential targets to track. Many tracking techniques, like multi-hypothesis trackers, suffer from a combinatorial explosion as the number of potential targets increase. As the resolution increases, the phenomenology applied towards detection algorithms also changes. For low resolution sensors, "blob" tracking is the norm. For higher resolution data, additional information may be employed in the detection and classfication steps. The most challenging scenarios are those where the targets cannot be fully resolved, yet must be tracked and distinguished for neighboring closely spaced objects. Tracking vehicles in an urban environment is an example of such a challenging scenario. This report evaluates several potential tracking algorithms for large-scale tracking in an urban environment.

  12. Paper BL3.199 EWEC 2007 Wind Energy Conference and Exhibition BL3.199 Wake Modelling for intermediate and large wind farms

    E-Print Network [OSTI]

    Paper BL3.199 EWEC 2007 Wind Energy Conference and Exhibition 1 BL3.199 Wake Modelling for intermediate and large wind farms Ole Rathmann1, 3 , Sten Frandsen1 , and Rebecca Barthelmie2, 1 1 Wind Energy.rathmann@risoe.dk Summary Modern, very large wind farms require large-scale effects to be taken into account when evaluating

  13. Voltage Impacts of Utility-Scale Distributed Wind

    SciTech Connect (OSTI)

    Allen, A.

    2014-09-01

    Although most utility-scale wind turbines in the United States are added at the transmission level in large wind power plants, distributed wind power offers an alternative that could increase the overall wind power penetration without the need for additional transmission. This report examines the distribution feeder-level voltage issues that can arise when adding utility-scale wind turbines to the distribution system. Four of the Pacific Northwest National Laboratory taxonomy feeders were examined in detail to study the voltage issues associated with adding wind turbines at different distances from the sub-station. General rules relating feeder resistance up to the point of turbine interconnection to the expected maximum voltage change levels were developed. Additional analysis examined line and transformer overvoltage conditions.

  14. 1Design limits and solutions for very large wind turbines Design limits and solutions for very large wind turbines

    E-Print Network [OSTI]

    Leu, Tzong-Shyng "Jeremy"

    #12;#12;1Design limits and solutions for very large wind turbines UpWind Design limits and solutions for very large wind turbines A 20 MW turbine is feasible March 2011 Supported by: #12;March 20112 Photo:Nordex #12;3Design limits and solutions for very large wind turbines Contents 1. UpWind: Summary

  15. Aalborg Universitet Ancillary Frequency Control of Direct Drive Full-Scale Converter Based Wind Power

    E-Print Network [OSTI]

    Hu, Weihao

    , integration of such a lot of wind energy into power grids presents a major challenge to power system operators more attentions all over the world. Large-scale wind power plants are increasingly integrated). Ancillary Frequency Control of Direct Drive Full-Scale Converter Based Wind Power Plants. In Proceedings

  16. Temporal structure of aggregate power fluctuations in large-eddy simulations of extended wind-farms

    E-Print Network [OSTI]

    Stevens, Richard J A M

    2014-01-01

    Fluctuations represent a major challenge for the incorporation of electric power from large wind-farms into power grids. Wind farm power output fluctuates strongly in time, over various time scales. Understanding these fluctuations, especially their spatio-temporal characteristics, is particularly important for the design of backup power systems that must be readily available in conjunction with wind-farms. In this work we analyze the power fluctuations associated with the wind-input variability at scales between minutes to several hours, using large eddy simulations (LES) of extended wind-parks, interacting with the atmospheric boundary layer. LES studies enable careful control of parameters and availability of wind-velocities simultaneously across the entire wind-farm. The present study focuses on neutral atmospheric conditions and flat terrain, using actuator-disk representations of the individual wind-turbines. We consider power from various aggregates of wind-turbines such as the total average power sign...

  17. Magnetic Field Rotations in the Solar Wind at Kinetic Scales

    E-Print Network [OSTI]

    Chen, C H K; Burgess, D; Horbury, T S

    2015-01-01

    The solar wind magnetic field contains rotations at a broad range of scales, which have been extensively studied in the MHD range. Here we present an extension of this analysis to the range between ion and electron kinetic scales. The distribution of rotation angles was found to be approximately log-normal, shifting to smaller angles at smaller scales almost self-similarly, but with small, statistically significant changes of shape. The fraction of energy in fluctuations with angles larger than $\\alpha$ was found to drop approximately exponentially with $\\alpha$, with e-folding angle $9.8^\\circ$ at ion scales and $0.66^\\circ$ at electron scales, showing that large angles ($\\alpha > 30^\\circ$) do not contain a significant amount of energy at kinetic scales. Implications for kinetic turbulence theory and the dissipation of solar wind turbulence are discussed.

  18. Doctoral Position Aeroelastic Analysis of Large Wind Turbines

    E-Print Network [OSTI]

    Doctoral Position Aeroelastic Analysis of Large Wind Turbines In the research project "Aeroelastic Analysis Horizontal-axis wind turbine and numerical model. of Large Wind Turbines" funded by the Ger- man involving the in-house Finite-Element CFD code XNS to enable the simulation of wind turbines. The ability

  19. Analytical Modelling of Wind Speed Deficit in Large Offshore Wind Farms

    E-Print Network [OSTI]

    Pryor, Sara C.

    Analytical Modelling of Wind Speed Deficit in Large Offshore Wind Farms Sten Frandsen*, Rebecca areas.As is often the need for offshore wind farms, the model handles a regular array geometry for offshore wind farms, the model handles a priori a regular array geometry with straight rows of wind

  20. Ris-R-Report Power fluctuations from large wind farms -

    E-Print Network [OSTI]

    Abstract (max. 2000 char.): Experience from power system operation with the first large offshore wind farm acquired at the two large offshore wind farms in Denmark are applied to validate the models. FinallyRisø-R-Report Power fluctuations from large wind farms - Final report Poul Sørensen, Pierre Pinson

  1. A Minnesota Blizzard Provides Insight into Utility-Scale Wind...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    A Minnesota Blizzard Provides Insight into Utility-Scale Wind Turbine Wakes A Minnesota Blizzard Provides Insight into Utility-Scale Wind Turbine Wakes September 12, 2014 - 11:22am...

  2. Argonne National Laboratory Develops Extreme-Scale Wind Farm...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    to conduct studies of complex flow and wind turbine interactions in large land-based and offshore wind farms that will improve wind plant design and reduce the levelized cost of...

  3. Mesoscale and Large-Eddy Simulations for Wind Energy

    SciTech Connect (OSTI)

    Marjanovic, N

    2011-02-22

    Operational wind power forecasting, turbine micrositing, and turbine design require high-resolution simulations of atmospheric flow over complex terrain. The use of both Reynolds-Averaged Navier Stokes (RANS) and large-eddy (LES) simulations is explored for wind energy applications using the Weather Research and Forecasting (WRF) model. To adequately resolve terrain and turbulence in the atmospheric boundary layer, grid nesting is used to refine the grid from mesoscale to finer scales. This paper examines the performance of the grid nesting configuration, turbulence closures, and resolution (up to as fine as 100 m horizontal spacing) for simulations of synoptically and locally driven wind ramping events at a West Coast North American wind farm. Interestingly, little improvement is found when using higher resolution simulations or better resolved turbulence closures in comparison to observation data available for this particular site. This is true for week-long simulations as well, where finer resolution runs show only small changes in the distribution of wind speeds or turbulence intensities. It appears that the relatively simple topography of this site is adequately resolved by all model grids (even as coarse as 2.7 km) so that all resolutions are able to model the physics at similar accuracy. The accuracy of the results is shown in this paper to be more dependent on the parameterization of the land-surface characteristics such as soil moisture rather than on grid resolution.

  4. Aalborg Universitet FACTS Devices for Large Wind Power Plants

    E-Print Network [OSTI]

    Berning, Torsten

    of wind power has become significant, grid performance and stability is affected [3]-[5]. ThereforeAalborg Universitet FACTS Devices for Large Wind Power Plants Adamczyk, Andrzej Grzegorz., Teodorescu, R., Rodriguez, P., & Mukerjee, R. N. (2010). FACTS Devices for Large Wind Power Plants

  5. CHALLENGES OF INTEGRATING LARGE AMOUNTS OF WIND Jonathan D. Rose

    E-Print Network [OSTI]

    CHALLENGES OF INTEGRATING LARGE AMOUNTS OF WIND POWER Jonathan D. Rose Univ. of Wisconsin ­ Madison and reducing torque shocks caused by wind gusts. However, they absorbed large amounts of reactive power and turbine improvements that make wind energy more grid-compatible to ensure further growth of this promising

  6. Large-Distributed Solar and Wind Grant Program

    Broader source: Energy.gov [DOE]

    The Illinois Department of Commerce and Economic Opportunity (DCEO) is offering grants for community-scale solar and wind projects located in Illinois.

  7. A Robust Data Delivery Protocol for Large Scale Sensor Networks

    E-Print Network [OSTI]

    California at Los Angeles, University of

    by the sender. GRAB design harnesses the advantage of large scale and relies on the col- lective e#11;orts simulation exper- iments, GRAB can successfully deliver above 90% of data with relatively low energy cost the small, power-limited sensor nodes are prone to errors. Severe operational conditions (e.g. strong wind

  8. Wind Extremes and Scales: Multifractal Insights and Empirical Evidence

    E-Print Network [OSTI]

    Lovejoy, Shaun

    17 Wind Extremes and Scales: Multifractal Insights and Empirical Evidence I. Tchiguirinskaia, D. Schertzer, S. Lovejoy, J.M. Veysseire Summary. An accurate assessment of wind extremes at various space-time scales (e.g. gusts, tempests, etc.) is of prime importance for a safe and efficient wind energy

  9. Large Commercial Wind Exemption and Alternative Taxes

    Office of Energy Efficiency and Renewable Energy (EERE)

    The alternative taxation method has two components. The first component is an annual tax equal to $3 per kilowatt (kW) of capacity of the wind farm, prorated according to when the wind farm begins...

  10. Conundrum of the Large Scale Streaming

    E-Print Network [OSTI]

    T. M. Malm

    1999-09-12

    The etiology of the large scale peculiar velocity (large scale streaming motion) of clusters would increasingly seem more tenuous, within the context of the gravitational instability hypothesis. Are there any alternative testable models possibly accounting for such large scale streaming of clusters?

  11. Dissipation-Scale Turbulence in the Solar Wind

    E-Print Network [OSTI]

    Gregory G. Howes; Steven C. Cowley; William Dorland; Gregory W. Hammett; Eliot Quataert; Alexander A. Schekochihin

    2007-07-20

    We present a cascade model for turbulence in weakly collisional plasmas that follows the nonlinear cascade of energy from the large scales of driving in the MHD regime to the small scales of the kinetic Alfven wave regime where the turbulence is dissipated by kinetic processes. Steady-state solutions of the model for the slow solar wind yield three conclusions: (1) beyond the observed break in the magnetic energy spectrum, one expects an exponential cut-off; (2) the widely held interpretation that this dissipation range obeys power-law behavior is an artifact of instrumental sensitivity limitations; and, (3) over the range of parameters relevant to the solar wind, the observed variation of dissipation range spectral indices from -2 to -4 is naturally explained by the varying effectiveness of Landau damping, from an undamped prediction of -7/3 to a strongly damped index around -4.

  12. Large-Scale Information Systems

    SciTech Connect (OSTI)

    D. M. Nicol; H. R. Ammerlahn; M. E. Goldsby; M. M. Johnson; D. E. Rhodes; A. S. Yoshimura

    2000-12-01

    Large enterprises are ever more dependent on their Large-Scale Information Systems (LSLS), computer systems that are distinguished architecturally by distributed components--data sources, networks, computing engines, simulations, human-in-the-loop control and remote access stations. These systems provide such capabilities as workflow, data fusion and distributed database access. The Nuclear Weapons Complex (NWC) contains many examples of LSIS components, a fact that motivates this research. However, most LSIS in use grew up from collections of separate subsystems that were not designed to be components of an integrated system. For this reason, they are often difficult to analyze and control. The problem is made more difficult by the size of a typical system, its diversity of information sources, and the institutional complexities associated with its geographic distribution across the enterprise. Moreover, there is no integrated approach for analyzing or managing such systems. Indeed, integrated development of LSIS is an active area of academic research. This work developed such an approach by simulating the various components of the LSIS and allowing the simulated components to interact with real LSIS subsystems. This research demonstrated two benefits. First, applying it to a particular LSIS provided a thorough understanding of the interfaces between the system's components. Second, it demonstrated how more rapid and detailed answers could be obtained to questions significant to the enterprise by interacting with the relevant LSIS subsystems through simulated components designed with those questions in mind. In a final, added phase of the project, investigations were made on extending this research to wireless communication networks in support of telemetry applications.

  13. Utility-Scale Wind Turbines | Open Energy Information

    Open Energy Info (EERE)

    turbines as greater than 1 megawatt. This technology class includes land-based and offshore wind projects. 1 Learn more about utility-scale wind at the links below....

  14. Large fully retractable telescope enclosures still closable in strong wind

    E-Print Network [OSTI]

    Rutten, Rob

    are too small to deteriorate the image in normal observing situations with wind speeds up to 20 mLarge fully retractable telescope enclosures still closable in strong wind Felix C.M. Bettonvil a the telescopes are in operation. The telescopes and enclosures also operate in hard wind. The prototypes

  15. Room-temperature stationary sodium-ion batteries for large-scale electric energy storage

    E-Print Network [OSTI]

    Wang, Wei Hua

    Room-temperature stationary sodium-ion batteries for large-scale electric energy storage Huilin Pan attention particularly in large- scale electric energy storage applications for renewable energy and smart, such as the wind and the sun, large-scale electric energy storage systems are becoming extremely important

  16. Electric power from offshore wind via synoptic-scale interconnection

    E-Print Network [OSTI]

    Firestone, Jeremy

    Electric power from offshore wind via synoptic-scale interconnection Willett Kemptona,1 , Felipe M regional estimate, Kempton et al. (2) calculated that two-thirds of the offshore wind power off the U in the U.S. Atlantic region is already underway. Fig. 1 shows as black squares offshore wind developments

  17. Grid-scale Fluctuations and Forecast Error in Wind Power

    E-Print Network [OSTI]

    G. Bel; C. P. Connaughton; M. Toots; M. M. Bandi

    2015-03-29

    The fluctuations in wind power entering an electrical grid (Irish grid) were analyzed and found to exhibit correlated fluctuations with a self-similar structure, a signature of large-scale correlations in atmospheric turbulence. The statistical structure of temporal correlations for fluctuations in generated and forecast time series was used to quantify two types of forecast error: a timescale error ($e_{\\tau}$) that quantifies the deviations between the high frequency components of the forecast and the generated time series, and a scaling error ($e_{\\zeta}$) that quantifies the degree to which the models fail to predict temporal correlations in the fluctuations of the generated power. With no $a$ $priori$ knowledge of the forecast models, we suggest a simple memory kernel that reduces both the timescale error ($e_{\\tau}$) and the scaling error ($e_{\\zeta}$).

  18. Grid-scale Fluctuations and Forecast Error in Wind Power

    E-Print Network [OSTI]

    Bel, G; Toots, M; Bandi, M M

    2015-01-01

    The fluctuations in wind power entering an electrical grid (Irish grid) were analyzed and found to exhibit correlated fluctuations with a self-similar structure, a signature of large-scale correlations in atmospheric turbulence. The statistical structure of temporal correlations for fluctuations in generated and forecast time series was used to quantify two types of forecast error: a timescale error ($e_{\\tau}$) that quantifies the deviations between the high frequency components of the forecast and the generated time series, and a scaling error ($e_{\\zeta}$) that quantifies the degree to which the models fail to predict temporal correlations in the fluctuations of the generated power. With no $a$ $priori$ knowledge of the forecast models, we suggest a simple memory kernel that reduces both the timescale error ($e_{\\tau}$) and the scaling error ($e_{\\zeta}$).

  19. Large Scale Energy Storage: From Nanomaterials to Large Systems

    E-Print Network [OSTI]

    Fisher, Frank

    Large Scale Energy Storage: From Nanomaterials to Large Systems Wednesday October 26, 2011, Babbio energy storage devices. Specifically, this talk discusses 1) the challenges for grid scale of emergent technologies with ultralow costs on new energy storage materials and mechanisms. Dr. Jun Liu

  20. High Performance Electronic Structure Engineering: Large Scale...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    High Performance Electronic Structure Engineering: Large Scale GW Calculations Event Sponsor: Argonne Leadership Computing Facility Seminar Start Date: Aug 7 2015 - 10:00am...

  1. Large-scale pool fires 

    E-Print Network [OSTI]

    Steinhaus, Thomas; Welch, Stephen; Carvel, Ricky O; Torero, Jose L

    2007-03-29

    A review of research into the burning behaviour of large pool fires and fuel spill fires is presented. The features which distinguish such fires from smaller pool fires are mainly associated with the fire dynamics at low ...

  2. National-Scale Wind Resource Assessment for Power Generation (Presentation)

    SciTech Connect (OSTI)

    Baring-Gould, E. I.

    2013-08-01

    This presentation describes the current standards for conducting a national-scale wind resource assessment for power generation, along with the risk/benefit considerations to be considered when beginning a wind resource assessment. The presentation describes changes in turbine technology and viable wind deployment due to more modern turbine technology and taller towers and shows how the Philippines national wind resource assessment evolved over time to reflect changes that arise from updated technologies and taller towers.

  3. Microfluidic Large-Scale Integration: The Evolution

    E-Print Network [OSTI]

    Quake, Stephen R.

    Microfluidic Large-Scale Integration: The Evolution of Design Rules for Biological Automation, polydimethylsiloxane Abstract Microfluidic large-scale integration (mLSI) refers to the develop- ment of microfluidic, are discussed. Several microfluidic components used as building blocks to create effective, complex, and highly

  4. Management of Large-Scale International

    E-Print Network [OSTI]

    Management of Large- Scale International Science Projects Dr. Benjamin J. Cross, P.E. Savannah of Government Commerce) #12;Extending Project Management to New, Complex Challenges · Emergence of large-scale-of-the-art R&D and technologies ­ Exceedingly high energies, temperatures, radiological conditions, special

  5. DLFM library tools for large scale dynamic applications.

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    DLFM library tools for large scale dynamic applications DLFM library tools for large scale dynamic applications Large scale Python and other dynamic applications may spend huge...

  6. Ris-R-1532(EN) Operation and control of large wind

    E-Print Network [OSTI]

    Risø-R-1532(EN) Operation and control of large wind turbines and wind farms - Final report Poul, Henrik Madsen and Martin H. Donovan Title: Operation and control of large wind turbines and wind farms "Operation and control of large wind turbines and wind farms". The objective of the project has been

  7. NREL Controllable Grid Interface for Testing MW-Scale Wind Turbine

    Office of Scientific and Technical Information (OSTI)

    Controllable Grid Interface for Testing MW-Scale Wind Turbine Generators (Poster) McDade, M.; Gevorgian, V.; Wallen, R.; Erdman, W. 17 WIND ENERGY WIND TURBINE TESTING;...

  8. Superconducting generators for large off shore wind turbines 

    E-Print Network [OSTI]

    Keysan, Ozan

    2014-06-30

    This thesis describes four novel superconducting machine concepts, in the pursuit of finding a suitable design for large offshore wind turbines. The designs should be reliable, modular and light-weight. The main novelty ...

  9. Limits to the power density of very large wind farms

    E-Print Network [OSTI]

    Nishino, Takafumi

    2013-01-01

    A simple analysis is presented concerning an upper limit of the power density (power per unit land area) of a very large wind farm located at the bottom of a fully developed boundary layer. The analysis suggests that the limit of the power density is about 0.38 times $\\tau_{w0}U_{F0}$, where $\\tau_{w0}$ is the natural shear stress on the ground (that is observed before constructing the wind farm) and $U_{F0}$ is the natural or undisturbed wind speed averaged across the height of the farm to be constructed. Importantly, this implies that the maximum extractable power from such a very large wind farm will not be proportional to the cubic of the wind speed at the farm height, or even the farm height itself, but be proportional to $U_{F0}$.

  10. Topological relics of symmetry breaking: Winding numbers and scaling tilts from random vortex-antivortex pairs

    E-Print Network [OSTI]

    Wojciech H. Zurek

    2014-10-01

    I show that random distributions of vortex-antivortex pairs (rather than of individual vortices) lead to scaling of typical winding numbers W trapped inside a loop of circumference C with the square root of C when the expected winding numbers are large. Such scaling is consistent with the Kibble-Zurek mechanism (KZM). By contrast, distribution of individual vortices with randomly assigned topological charges would result in the dispersion of W scaling with the square root of the area inside C. Scaling of the dispersion of W and of the probability of detection of non-zero W with C can be also studied for loops so small that non-zero windings are rare. In this case I show a doubling of the scaling of dispersion with C when compared to the scaling of dispersion in the large W regime. Moreover, probability of trapping of a non-zero W becomes, in this case, proportional to the area subtended by C (hence, to the square of circumference). This quadruples, as compared with large winding numbers regime, the exponent in the power law dependence of the frequency of trapping of W=+1 or W=-1 on C. Such change of the power law exponent by a FACTOR OF FOUR implies quadrupling of the scaling of the frequency of winding number trapping with the quench rate, and is of key importance for experimental tests of KZM.

  11. SCALE DEPENDENCE OF MAGNETIC HELICITY IN THE SOLAR WIND

    SciTech Connect (OSTI)

    Brandenburg, Axel; Subramanian, Kandaswamy; Balogh, Andre; Goldstein, Melvyn L. E-mail: kandu@iucaa.ernet.in E-mail: melvyn.l.goldstein@nasa.gov

    2011-06-10

    We determine the magnetic helicity, along with the magnetic energy, at high latitudes using data from the Ulysses mission. The data set spans the time period from 1993 to 1996. The basic assumption of the analysis is that the solar wind is homogeneous. Because the solar wind speed is high, we follow the approach first pioneered by Matthaeus et al. by which, under the assumption of spatial homogeneity, one can use Fourier transforms of the magnetic field time series to construct one-dimensional spectra of the magnetic energy and magnetic helicity under the assumption that the Taylor frozen-in-flow hypothesis is valid. That is a well-satisfied assumption for the data used in this study. The magnetic helicity derives from the skew-symmetric terms of the three-dimensional magnetic correlation tensor, while the symmetric terms of the tensor are used to determine the magnetic energy spectrum. Our results show a sign change of magnetic helicity at wavenumber k {approx} 2 AU{sup -1} (or frequency {nu} {approx} 2 {mu}Hz) at distances below 2.8 AU and at k {approx} 30 AU{sup -1} (or {nu} {approx} 25 {mu}Hz) at larger distances. At small scales the magnetic helicity is positive at northern heliographic latitudes and negative at southern latitudes. The positive magnetic helicity at small scales is argued to be the result of turbulent diffusion reversing the sign relative to what is seen at small scales at the solar surface. Furthermore, the magnetic helicity declines toward solar minimum in 1996. The magnetic helicity flux integrated separately over one hemisphere amounts to about 10{sup 45} Mx{sup 2} cycle{sup -1} at large scales and to a three times lower value at smaller scales.

  12. Program Management for Large Scale Engineering Programs

    E-Print Network [OSTI]

    Oehmen, Josef

    The goal of this whitepaper is to summarize the LAI research that applies to program management. The context of most of the research discussed in this whitepaper are large-scale engineering programs, particularly in the ...

  13. FULL-SCALE, WIND TUNNEL AND CFD WIND ENGINEERING STUDIES A variety of methods can be used to obtain wind engineering design information. These include

    E-Print Network [OSTI]

    Savory, Eric

    FULL-SCALE, WIND TUNNEL AND CFD WIND ENGINEERING STUDIES A variety of methods can be used to obtain wind engineering design information. These include codes of practice, full-scale, wind tunnel are listed in the table below: Table 1. Relative advantages and disadvantages of wind engineering techniques

  14. 2D MHD MODELS OF THE LARGE SCALE SOLAR Eirik Endeve

    E-Print Network [OSTI]

    California at Berkeley, University of

    by the ideal gas law, P 2nkT. In order to study the acceleration of high- and low- speed solar wind one must2D MHD MODELS OF THE LARGE SCALE SOLAR CORONA Eirik Endeve£ , Thomas E. Holzer and Egil Leer to determine the structure of the large scale solar corona. When our numerical calculations are initiated

  15. INTERMITTENCY OF SOLAR WIND DENSITY FLUCTUATIONS FROM ION TO ELECTRON SCALES

    SciTech Connect (OSTI)

    Chen, C. H. K.; Sorriso-Valvo, L.; Šafránková, J.; N?me?ek, Z.

    2014-07-01

    The intermittency of density fluctuations in the solar wind at kinetic scales has been examined using high time resolution Faraday cup measurements from the Spektr-R spacecraft. It was found that the probability density functions (PDFs) of the fluctuations are highly non-Gaussian over this range, but do not show large changes in shape with scale. These properties are statistically similar to those of the magnetic fluctuations and are important to understanding the dynamics of small scale turbulence in the solar wind. Possible explanations for the behavior of the density and magnetic fluctuations are discussed.

  16. Impact of Utility-Scale Distributed Wind on Transmission-Level System Operations

    SciTech Connect (OSTI)

    Brancucci Martinez-Anido, C.; Hodge, B. M.

    2014-09-01

    This report presents a new renewable integration study that aims to assess the potential for adding distributed wind to the current power system with minimal or no upgrades to the distribution or transmission electricity systems. It investigates the impacts of integrating large amounts of utility-scale distributed wind power on bulk system operations by performing a case study on the power system of the Independent System Operator-New England (ISO-NE).

  17. Large-Eddy Simulation of Wind-Plant Aerodynamics: Preprint

    SciTech Connect (OSTI)

    Churchfield, M. J.; Lee, S.; Moriarty, P. J.; Martinez, L. A.; Leonardi, S.; Vijayakumar, G.; Brasseur, J. G.

    2012-01-01

    In this work, we present results of a large-eddy simulation of the 48 multi-megawatt turbines composing the Lillgrund wind plant. Turbulent inflow wind is created by performing an atmospheric boundary layer precursor simulation and turbines are modeled using a rotating, variable-speed actuator line representation. The motivation for this work is that few others have done wind plant large-eddy simulations with a substantial number of turbines, and the methods for carrying out the simulations are varied. We wish to draw upon the strengths of the existing simulations and our growing atmospheric large-eddy simulation capability to create a sound methodology for performing this type of simulation. We have used the OpenFOAM CFD toolbox to create our solver.

  18. IntroductionIntroduction The use of small scale vertical axis wind turbinesThe use of small scale vertical axis wind turbines

    E-Print Network [OSTI]

    Tullis, Stephen

    IntroductionIntroduction The use of small scale vertical axis wind turbinesThe use of small scale vertical axis wind turbines (VAWT) is being studied at McMaster University using(VAWT) is being studied at McMaster University using a prototype wind turbine provided bya prototype wind turbine provided

  19. Large-scale gyrokinetic particle simulation of

    E-Print Network [OSTI]

    Oliker, Leonid

    areas of research including plasma astrophysics and fusion energy science. Fusion is the power source that are still needed to make fusion energy a practical realization. Research in plasma science requiresLarge-scale gyrokinetic particle simulation of microturbulence in magnetically confined fusion

  20. Feasibility Study for a Hopi Utility-Scale Wind Project

    SciTech Connect (OSTI)

    Kendrick Lomayestewa

    2011-05-31

    The goal of this project was to investigate the feasibility for the generation of energy from wind and to parallel this work with the development of a tribal utility organization capable of undertaking potential joint ventures in utility businesses and projects on the Hopi reservation. The goal of this project was to investigate the feasibility for the generation of energy from wind and to parallel this work with the development of a tribal utility organization capable of undertaking potential joint ventures in utility businesses and projects on the Hopi reservation. Wind resource assessments were conducted at two study sites on Hopi fee simple lands located south of the city of Winslow. Reports from the study were recently completed and have not been compared to any existing historical wind data nor have they been processed under any wind assessment models to determine the output performance and the project economics of turbines at the wind study sites. Ongoing analysis of the wind data and project modeling will determine the feasibility of a tribal utility-scale wind energy generation.

  1. The Effective Field Theory of Cosmological Large Scale Structures...

    Office of Scientific and Technical Information (OSTI)

    The Effective Field Theory of Cosmological Large Scale Structures Citation Details In-Document Search Title: The Effective Field Theory of Cosmological Large Scale Structures...

  2. The Effective Field Theory of Cosmological Large Scale Structures...

    Office of Scientific and Technical Information (OSTI)

    The Effective Field Theory of Cosmological Large Scale Structures Citation Details In-Document Search Title: The Effective Field Theory of Cosmological Large Scale Structures ...

  3. ACCOLADES: A Scalable Workflow Framework for Large-Scale Simulation...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    ACCOLADES: A Scalable Workflow Framework for Large-Scale Simulation and Analyses of Automotive Engines Title ACCOLADES: A Scalable Workflow Framework for Large-Scale Simulation and...

  4. Large Scale Computing and Storage Requirements for Advanced Scientific...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Large Scale Computing and Storage Requirements for Advanced Scientific Computing Research: Target 2014 ASCRFrontcover.png Large Scale Computing and Storage Requirements for...

  5. Overcoming the Barrier to Achieving Large-Scale Production -...

    Office of Environmental Management (EM)

    Overcoming the Barrier to Achieving Large-Scale Production - A Case Study Overcoming the Barrier to Achieving Large-Scale Production - A Case Study This presentation summarizes the...

  6. Large-Scale PV Integration Study

    SciTech Connect (OSTI)

    Lu, Shuai; Etingov, Pavel V.; Diao, Ruisheng; Ma, Jian; Samaan, Nader A.; Makarov, Yuri V.; Guo, Xinxin; Hafen, Ryan P.; Jin, Chunlian; Kirkham, Harold; Shlatz, Eugene; Frantzis, Lisa; McClive, Timothy; Karlson, Gregory; Acharya, Dhruv; Ellis, Abraham; Stein, Joshua; Hansen, Clifford; Chadliev, Vladimir; Smart, Michael; Salgo, Richard; Sorensen, Rahn; Allen, Barbara; Idelchik, Boris

    2011-07-29

    This research effort evaluates the impact of large-scale photovoltaic (PV) and distributed generation (DG) output on NV Energy’s electric grid system in southern Nevada. It analyzes the ability of NV Energy’s generation to accommodate increasing amounts of utility-scale PV and DG, and the resulting cost of integrating variable renewable resources. The study was jointly funded by the United States Department of Energy and NV Energy, and conducted by a project team comprised of industry experts and research scientists from Navigant Consulting Inc., Sandia National Laboratories, Pacific Northwest National Laboratory and NV Energy.

  7. 2011 Wind Technologies Market Report

    E-Print Network [OSTI]

    Bolinger, Mark

    2013-01-01

    AWEA’s Wind Energy Weekly, DOE/EPRI’s Turbine Verification10% Wind Energy Penetration New large-scale 8 wind turbines100 wind turbine installed at the National Renewable Energy

  8. Initial Economic Analysis of Utility-scale Wind Integration in Hawaii

    Office of Energy Efficiency and Renewable Energy (EERE)

    Summarizes analysis of the economic characteristics of the utility-scale wind configuration project that has been referred to as the “Big Wind” project.

  9. Quiet airfoils for small and large wind turbines

    DOE Patents [OSTI]

    Tangler, James L. (Boulder, CO); Somers, Dan L. (Port Matilda, PA)

    2012-06-12

    Thick airfoil families with desirable aerodynamic performance with minimal airfoil induced noise. The airfoil families are suitable for a variety of wind turbine designs and are particularly well-suited for use with horizontal axis wind turbines (HAWTs) with constant or variable speed using pitch and/or stall control. In exemplary embodiments, a first family of three thick airfoils is provided for use with small wind turbines and second family of three thick airfoils is provided for use with very large machines, e.g., an airfoil defined for each of three blade radial stations or blade portions defined along the length of a blade. Each of the families is designed to provide a high maximum lift coefficient or high lift, to exhibit docile stalls, to be relatively insensitive to roughness, and to achieve a low profile drag.

  10. Economic assessment of small-scale electricity generation from wind 

    E-Print Network [OSTI]

    McAllister, Kristen Dawn

    2007-09-17

    Analysis was done to determine if small-scale wind energy could be economically feasible on a cotton farm with 1,200 irrigated acres, a house, and a barn. Lubbock and Midland were locations chosen for this model farm and the twenty-year analysis. A...

  11. Four Corners Wind Resource Center Webinar: Building Utility-Scale Wind: Permitting and Regulation Lessons for County Decision-Makers

    Office of Energy Efficiency and Renewable Energy (EERE)

    The Four Corners Wind Resource Center will host this webinar exploring lessons learned in the permitting of utility-scale wind projects and the development of ordinances and regulations for...

  12. Investment Timing and Capacity Choice for Small-Scale Wind Power Under Uncertainty

    E-Print Network [OSTI]

    Fleten, Stein-Erik; Maribu, Karl Magnus

    2004-01-01

    REFERENCES [1] American Wind Power Association (AWEA), Road-CHOICE FOR SMALL-SCALE WIND POWER UNDER UNCERTAINTY Stein-Power production from wind power has stochastic inflows, and

  13. Investment Timing and Capacity Choice for Small-Scale Wind Power Under Uncertainty

    E-Print Network [OSTI]

    Fleten, Stein-Erik; Maribu, Karl Magnus

    2004-01-01

    A 20-year industry plan for small wind turbine tech- nology,has estimated that small wind turbines could contribute to 3CAPACITY CHOICE FOR SMALL-SCALE WIND POWER UNDER UNCERTAINTY

  14. Offshore Coastal Wind Speed Gradients: issues for the design and development of large offshore windfarms

    E-Print Network [OSTI]

    Pryor, Sara C.

    -situ and remote sensing data from offshore wind farms in Denmark, are used to examine both horizontal and vertical the area of the wind farm appear to be small and negligible. 1. INTRODUCTION As large offshore wind farmsOffshore Coastal Wind Speed Gradients: issues for the design and development of large offshore

  15. The characteristics of sharp (small-scale) boundaries of solar wind plasma and magnetic field structures

    E-Print Network [OSTI]

    Richardson, John

    The characteristics of sharp (small-scale) boundaries of solar wind plasma and magnetic field are the boundaries of small-scale and mid- dle-scale solar wind structures. We describe the behavior of the solar boundaries of small and medium scale solar wind plasma structures which we identify by looking for sharp

  16. 1 National Roadmap Committee for Large-Scale Research Facilities the netherlands' roadmap for large-scale research facilities

    E-Print Network [OSTI]

    Horn, David

    #12;1 National Roadmap Committee for Large-Scale Research Facilities the netherlands' roadmap for large-scale research facilities #12;2 National Roadmap Committee for Large-Scale Research Facilities1 by Roselinde Supheert) #12;3 National Roadmap Committee for Large-Scale Research Facilities The Netherlands

  17. A Tree Swaying in a Turbulent Wind: A Scaling Analysis

    E-Print Network [OSTI]

    Theo Odijk

    2014-07-10

    A tentative scaling theory is presented of a tree swaying in a turbulent wind. It is argued that the turbulence of the air within the crown is in the inertial regime. An eddy causes a dynamic bending response of the branches according to a time criterion. The resulting expression for the penetration depth of the wind yields an exponent which appears to be consistent with that pertaining to the morphology of the tree branches. An energy criterion shows that the dynamics of the branches is basically passive. The possibility of hydrodynamic screening by the leaves is discussed.

  18. Analysis of Wind Power and Load Data at Multiple Time Scales

    SciTech Connect (OSTI)

    Coughlin, Katie; Eto, J.H.

    2010-12-20

    In this study we develop and apply new methods of data analysis for high resolution wind power and system load time series, to improve our understanding of how to characterize highly variable wind power output and the correlations between wind power and load. These methods are applied to wind and load data from the ERCOT region, and wind power output from the PJM and NYISO areas. We use a wavelet transform to apply mathematically well-defined operations of smoothing and differencing to the time series data. This approach produces a set of time series of the changes in wind power and load (or ?deltas?), over a range of times scales from a few seconds to approximately one hour. A number of statistical measures of these time series are calculated. We present sample distributions, and devise a method for fitting the empirical distribution shape in the tails. We also evaluate the degree of serial correlation, and linear correlation between wind and load. Our examination of the data shows clearly that the deltas do not follow a Gaussian shape; the distribution is exponential near the center and appears to follow a power law for larger fluctuations. Gaussian distributions are frequently used in modeling studies. These are likely to over-estimate the probability of small to moderate deviations. This in turn may lead to an over-estimation of the additional reserve requirement (hence the cost) for high penetration of wind. The Gaussian assumption provides no meaningful information about the real likelihood of large fluctuations. The possibility of a power law distribution is interesting because it suggests that the distribution shape for of wind power fluctuations may become independent of system size for large enough systems.

  19. Simulations of an offshore wind farm using large eddy simulation and a torque-controlled actuator disc model

    E-Print Network [OSTI]

    Creech, Angus; Maguire, A Eoghan

    2014-01-01

    We present here a computational fluid dynamics (CFD) simulation of Lillgrund offshore wind farm, which is located in the {\\O}resund Strait between Sweden and Denmark. The simulation combines a dynamic representation of wind turbines embedded within a Large-Eddy Simulation CFD solver, and uses hr-adaptive meshing to increase or decrease mesh resolution where required. This allows the resolution of both large scale flow structures around the wind farm, and local flow conditions at individual turbines; consequently, the response of each turbine to local conditions can be modelled, as well as the resulting evolution of the turbine wakes. This paper provides a detailed description of the turbine model which simulates interactions between the wind, turbine rotors, and turbine generators by calculating the forces on the rotor, the body forces on the air, and instantaneous power output. This model was used to investigate a selection of key wind speeds and directions, investigating cases where a row of turbines would ...

  20. FAST Code Verification of Scaling Laws for DeepCwind Floating Wind System Tests: Preprint

    SciTech Connect (OSTI)

    Jain, A.; Robertson, A. N.; Jonkman, J. M.; Goupee, A. J.; Kimball, R. W.; Swift, A. H. P.

    2012-04-01

    This paper investigates scaling laws that were adopted for the DeepCwind project for testing three different floating wind systems at 1/50 scale in a wave tank under combined wind and wave loading.

  1. Aalborg Universitet Transient Studies in Large Offshore Wind Farms, Employing Detailed Circuit Breaker

    E-Print Network [OSTI]

    Bak, Claus Leth

    Aalborg Universitet Transient Studies in Large Offshore Wind Farms, Employing Detailed Circuit Studies in Large Offshore Wind Farms, Employing Detailed Circuit Breaker Representation. Electrical Power 1996-1073 www.mdpi.com/journal/energies Article Transient Studies in Large Offshore Wind Farms

  2. Ris-R-Report Improved design for large wind turbine blades

    E-Print Network [OSTI]

    Risø-R-Report Improved design for large wind turbine blades of fibre composites (Phase 3) - Summary: Improved design for large wind turbine blades of fibre composites (Phase 3) - Summary report Division: 1 char.): An overview is given of the activities of the project "Improved design for large wind turbine

  3. A Review of "Small-Scale Wind Turbines Policy Perspectives and

    E-Print Network [OSTI]

    Hughes, Larry

    ERG/200607 A Review of "Small-Scale Wind Turbines ­ Policy Perspectives and Recommendations of Engineering Mathematics at Dalhousie University. #12;Hughes-Long: A Review of Small-Scale Wind Turbines proposed changes to their municipal Bylaws to allow the installation of "small-scale" wind turbines (i

  4. Batteries for Large Scale Energy Storage

    SciTech Connect (OSTI)

    Soloveichik, Grigorii L.

    2011-07-15

    In recent years, with the deployment of renewable energy sources, advances in electrified transportation, and development in smart grids, the markets for large-scale stationary energy storage have grown rapidly. Electrochemical energy storage methods are strong candidate solutions due to their high energy density, flexibility, and scalability. This review provides an overview of mature and emerging technologies for secondary and redox flow batteries. New developments in the chemistry of secondary and flow batteries as well as regenerative fuel cells are also considered. Advantages and disadvantages of current and prospective electrochemical energy storage options are discussed. The most promising technologies in the short term are high-temperature sodium batteries with ?”-alumina electrolyte, lithium-ion batteries, and flow batteries. Regenerative fuel cells and lithium metal batteries with high energy density require further research to become practical.

  5. Impacts of large quantities of wind energy on the electric power system

    E-Print Network [OSTI]

    Yao, Yuan, S.M. Massachusetts Institute of Technology

    2011-01-01

    Wind energy has been surging on a global scale. Significant penetration of wind energy is expected to take place in the power system, bringing new challenges because of the variability and uncertainty of this renewable ...

  6. Theoretical Tools for Large Scale Structure

    E-Print Network [OSTI]

    J. R. Bond; L. Kofman; D. Pogosyan; J. Wadsley

    1998-10-06

    We review the main theoretical aspects of the structure formation paradigm which impinge upon wide angle surveys: the early universe generation of gravitational metric fluctuations from quantum noise in scalar inflaton fields; the well understood and computed linear regime of CMB anisotropy and large scale structure (LSS) generation; the weakly nonlinear regime, where higher order perturbation theory works well, and where the cosmic web picture operates, describing an interconnected LSS of clusters bridged by filaments, with membranes as the intrafilament webbing. Current CMB+LSS data favour the simplest inflation-based $\\Lambda$CDM models, with a primordial spectral index within about 5% of scale invariant and $\\Omega_\\Lambda \\approx 2/3$, similar to that inferred from SNIa observations, and with open CDM models strongly disfavoured. The attack on the nonlinear regime with a variety of N-body and gas codes is described, as are the excursion set and peak-patch semianalytic approaches to object collapse. The ingredients are mixed together in an illustrative gasdynamical simulation of dense supercluster formation.

  7. Simulation of large-amplitude motion of floating wind turbines using conservation of momentum

    E-Print Network [OSTI]

    Sweetman, Bert

    Simulation of large-amplitude motion of floating wind turbines using conservation of momentum Lei equations of motion (EOMs) of a floating wind turbine system using the theorem of conservation of angular wind turbine dynamics software FAST. The concept of highly compliant floating wind turbines

  8. Large-Spin and Large-Winding Expansions of Giant Magnons and Single Spikes

    E-Print Network [OSTI]

    Emmanuel Floratos; Georgios Linardopoulos

    2015-11-11

    We generalize the method of our recent paper on the large-spin expansions of Gubser-Klebanov-Polyakov (GKP) strings to the large-spin and large-winding expansions of finite-size giant magnons and finite-size single spikes. By expressing the energies of long open strings in RxS2 in terms of Lambert's W-function, we compute the leading, subleading and next-to-subleading series of classical exponential corrections to the dispersion relations of Hofman-Maldacena giant magnons and infinite-winding single spikes. We also compute the corresponding expansions in the doubled regions of giant magnons and single spikes that are respectively obtained when their angular and linear velocities become smaller or greater than unity.

  9. IEEE TRANSACTIONS ON POWER SYSTEMS 1 Large-Scale Integration of Deferrable

    E-Print Network [OSTI]

    Oren, Shmuel S.

    . Index Terms--Load management, power generation scheduling, wind power generation. I. INTRODUCTION on power system operations it is necessary to represent the balancing oper- ations of the remaining gridIEEE TRANSACTIONS ON POWER SYSTEMS 1 Large-Scale Integration of Deferrable Demand and Renewable

  10. Large-scale Probabilistic Forecasting in Energy Systems using Sparse Gaussian Conditional Random Fields

    E-Print Network [OSTI]

    Kolter, J. Zico

    in a wide range of energy systems, including forecasting demand, renewable generation, and electricityLarge-scale Probabilistic Forecasting in Energy Systems using Sparse Gaussian Conditional Random demonstrated that in the context of electrical demand and wind power, probabilistic forecasts can offer

  11. Locations of Smart Grid Demonstration and Large-Scale Energy...

    Office of Environmental Management (EM)

    Locations of Smart Grid Demonstration and Large-Scale Energy Storage Projects Locations of Smart Grid Demonstration and Large-Scale Energy Storage Projects Map of the United States...

  12. FEMP Helps Federal Facilities Develop Large-Scale Renewable Energy...

    Office of Environmental Management (EM)

    FEMP Helps Federal Facilities Develop Large-Scale Renewable Energy Projects FEMP Helps Federal Facilities Develop Large-Scale Renewable Energy Projects August 21, 2013 - 12:00am...

  13. Energy Department Loan Guarantee Would Support Large-Scale Rooftop...

    Energy Savers [EERE]

    Loan Guarantee Would Support Large-Scale Rooftop Solar Power for U.S. Military Housing Energy Department Loan Guarantee Would Support Large-Scale Rooftop Solar Power for U.S....

  14. Models for Assessing Power Fluctuations from Large Wind Farms N. A. Cutululis1)

    E-Print Network [OSTI]

    that the active power supplied from the first large 160 MW offshore wind farm in this system, Horns Rev today). Figure 1. Power generation of Horns Rev offshore wind farm and onshore turbines, January 18 2005Models for Assessing Power Fluctuations from Large Wind Farms N. A. Cutululis1) , P. Sørensen1) , A

  15. Aalborg Universitet Transient studies in large offshore wind farms, taking into account network/circuit

    E-Print Network [OSTI]

    Bak, Claus Leth

    Aalborg Universitet Transient studies in large offshore wind farms, taking into account network as well as Transmission Networks for Offshore Wind Farms Publication date: 2011 Document Version Author in large offshore wind farms, taking into account network/circuit breaker interaction. In Proceedings

  16. DEVELOPMENTS IN LARGE BLADES FOR LOWER COST WIND TURBINES

    E-Print Network [OSTI]

    of the WindPACT project, the Blade System Design Studies developed innovations in manufacturing, materials capacity is a companion drop in the cost of wind energy (COE). The current cost of wind-produced power. 3). Wind produced power currently i

  17. Operational Impacts of Large Deployments of Offshore Wind (Poster)

    SciTech Connect (OSTI)

    Ibanez, E.; Heaney, M.

    2014-10-01

    The potential operational impact of deploying 54 GW of offshore wind in the United States was examined. The capacity was not evenly distributed; instead, it was concentrated in regions with better wind quality and close to load centers (Table 1). A statistical analysis of offshore wind power time series was used to assess the effect on the power system. The behavior of offshore wind resembled that of onshore wind, despite the former presenting higher capacity factors, more consistent power output across seasons, and higher variability levels. Thus, methods developed to manage onshore wind variability can be extended and applied to offshore wind.

  18. How Much Energy Is Transferred from the Winds to the Thermocline on ENSO Time Scales?

    E-Print Network [OSTI]

    How Much Energy Is Transferred from the Winds to the Thermocline on ENSO Time Scales? JACLYN N the winds (via wind power) and changes in the storage of available potential energy in the tropical ocean~o is characterized by a decrease in wind power that leads to a decrease in available potential energy, and hence

  19. Sharp boundaries of small-and middle-scale solar wind structures

    E-Print Network [OSTI]

    Richardson, John

    Sharp boundaries of small- and middle-scale solar wind structures M. O. Riazantseva1 and G. N wind ion flux changes which are not due to shocks. These changes are boundaries of small- and middle boundaries of small- and middle-scale solar wind structures, J. Geophys. Res., 110, A12110, doi:10

  20. Sensitivity technologies for large scale simulation.

    SciTech Connect (OSTI)

    Collis, Samuel Scott; Bartlett, Roscoe Ainsworth; Smith, Thomas Michael; Heinkenschloss, Matthias; Wilcox, Lucas C.; Hill, Judith C.; Ghattas, Omar; Berggren, Martin Olof; Akcelik, Volkan; Ober, Curtis Curry; van Bloemen Waanders, Bart Gustaaf; Keiter, Eric Richard

    2005-01-01

    Sensitivity analysis is critically important to numerous analysis algorithms, including large scale optimization, uncertainty quantification,reduced order modeling, and error estimation. Our research focused on developing tools, algorithms and standard interfaces to facilitate the implementation of sensitivity type analysis into existing code and equally important, the work was focused on ways to increase the visibility of sensitivity analysis. We attempt to accomplish the first objective through the development of hybrid automatic differentiation tools, standard linear algebra interfaces for numerical algorithms, time domain decomposition algorithms and two level Newton methods. We attempt to accomplish the second goal by presenting the results of several case studies in which direct sensitivities and adjoint methods have been effectively applied, in addition to an investigation of h-p adaptivity using adjoint based a posteriori error estimation. A mathematical overview is provided of direct sensitivities and adjoint methods for both steady state and transient simulations. Two case studies are presented to demonstrate the utility of these methods. A direct sensitivity method is implemented to solve a source inversion problem for steady state internal flows subject to convection diffusion. Real time performance is achieved using novel decomposition into offline and online calculations. Adjoint methods are used to reconstruct initial conditions of a contamination event in an external flow. We demonstrate an adjoint based transient solution. In addition, we investigated time domain decomposition algorithms in an attempt to improve the efficiency of transient simulations. Because derivative calculations are at the root of sensitivity calculations, we have developed hybrid automatic differentiation methods and implemented this approach for shape optimization for gas dynamics using the Euler equations. The hybrid automatic differentiation method was applied to a first order approximation of the Euler equations and used as a preconditioner. In comparison to other methods, the AD preconditioner showed better convergence behavior. Our ultimate target is to perform shape optimization and hp adaptivity using adjoint formulations in the Premo compressible fluid flow simulator. A mathematical formulation for mixed-level simulation algorithms has been developed where different physics interact at potentially different spatial resolutions in a single domain. To minimize the implementation effort, explicit solution methods can be considered, however, implicit methods are preferred if computational efficiency is of high priority. We present the use of a partial elimination nonlinear solver technique to solve these mixed level problems and show how these formulation are closely coupled to intrusive optimization approaches and sensitivity analyses. Production codes are typically not designed for sensitivity analysis or large scale optimization. The implementation of our optimization libraries into multiple production simulation codes in which each code has their own linear algebra interface becomes an intractable problem. In an attempt to streamline this task, we have developed a standard interface between the numerical algorithm (such as optimization) and the underlying linear algebra. These interfaces (TSFCore and TSFCoreNonlin) have been adopted by the Trilinos framework and the goal is to promote the use of these interfaces especially with new developments. Finally, an adjoint based a posteriori error estimator has been developed for discontinuous Galerkin discretization of Poisson's equation. The goal is to investigate other ways to leverage the adjoint calculations and we show how the convergence of the forward problem can be improved by adapting the grid using adjoint-based error estimates. Error estimation is usually conducted with continuous adjoints but if discrete adjoints are available it may be possible to reuse the discrete version for error estimation. We investigate the advantages and disadvantages of continuous and discre

  1. Initial Economic Analysis of Utility-Scale Wind Integration in Hawaii

    SciTech Connect (OSTI)

    Not Available

    2012-03-01

    This report summarizes an analysis, conducted by the National Renewable Energy Laboratory (NREL) in May 2010, of the economic characteristics of a particular utility-scale wind configuration project that has been referred to as the 'Big Wind' project.

  2. 2009 Wind Technologies Market Report

    E-Print Network [OSTI]

    Wiser, Ryan

    2010-01-01

    al. 2010. Large-scale Offshore Wind for the United States:examined land-based and offshore wind energy in the Easternassistance with the offshore wind energy discussion; Donna

  3. 2009 Wind Technologies Market Report

    E-Print Network [OSTI]

    Wiser, Ryan

    2010-01-01

    al. 2010. Large-scale Offshore Wind for the United States:assistance with the offshore wind energy discussion; DonnaTechnologies Market Report Offshore Wind Power Project and

  4. 2009 Wind Technologies Market Report

    E-Print Network [OSTI]

    Wiser, Ryan

    2010-01-01

    AWEA). 2010b. AWEA Small Wind Turbine Global Market Survey,html David, A. 2009. Wind Turbines: Industry and Tradewhich new large-scale wind turbines were installed in 2009 (

  5. 2009 Wind Technologies Market Report

    E-Print Network [OSTI]

    Wiser, Ryan

    2010-01-01

    AWEA’s Wind Energy Weekly, DOE/EPRI’s Turbine Verification10% Wind Energy Penetration New large-scale 10 wind turbineswind energy became more challenging, orders for new turbines

  6. Modal Dynamics of Large Wind Turbines with Different Support Structures

    SciTech Connect (OSTI)

    Bir, G.; Jonkman, J.

    2008-07-01

    This paper presents modal dynamics of floating-platform-supported and monopile-supported offshore wind turbines.

  7. Language Requirements for Large-Scale Generic Libraries

    E-Print Network [OSTI]

    Lumsdaine, Andrew

    Language Requirements for Large-Scale Generic Libraries Jeremy Siek and Andrew Lumsdaine {jsiek-scale software libraries. The fundamental principle of generic pro- gramming is the realization of interfaces programming and large-scale libraries. In this paper, we present an overview of G and analyze

  8. Detection and Classification of Ash Dieback on Large-Scale

    E-Print Network [OSTI]

    Detection and Classification of Ash Dieback on Large-Scale Color Aerial Photographs Ralph J of Agriculture 1966 #12;Croxton, Ralph J. 1966. Detection and classification of ash dieback on large- scale. Forest Serv. Res. Paper PSW-35) Aerial color photographs were taken at two scales over ash stands in New

  9. Quantifying the sensitivity of wind farm performance to array layout options using large-eddy simulation

    E-Print Network [OSTI]

    the effects of array layout on the performance of offshore wind farms. Array layout is characterized on peri- odic boundary conditions. This code, named Simulator for Offshore/Onshore Wind Farm ApplicationsQuantifying the sensitivity of wind farm performance to array layout options using large

  10. Energy Policy 35 (2007) 15841598 Public opinion about large offshore wind power: Underlying factors

    E-Print Network [OSTI]

    Firestone, Jeremy

    2007-01-01

    Energy Policy 35 (2007) 1584­1598 Public opinion about large offshore wind power: Underlying opinion regarding offshore wind power based on a survey of residents near a proposed development off Cape, the first offshore wind proposal in North America, in Nantucket Sound (MA, USA) has generated a strong

  11. Conceptual Design of Floating Wind Turbines with Large-Amplitude Motion

    E-Print Network [OSTI]

    Sweetman, Bert

    Conceptual Design of Floating Wind Turbines with Large-Amplitude Motion Lei Wang Department of spar-type floating offshore wind turbines is investigated in detail. Three conceptual designs based for siting offshore wind turbines beyond sight of land, where waters tend to be deeper, and use of floating

  12. Large scale prediction models and algorithms

    E-Print Network [OSTI]

    Monsch, Matthieu (Matthieu Frederic)

    2013-01-01

    Over 90% of the data available across the world has been produced over the last two years, and the trend is increasing. It has therefore become paramount to develop algorithms which are able to scale to very high dimensions. ...

  13. Introduction to Small-Scale Wind Energy Systems (Including RETScreen...

    Open Energy Info (EERE)

    production of a wind turbine or farm. It covers topics such as vertical and horizontal axis wind turbines. There is also a tutorial for RETscreen's wind tool, in which the...

  14. Nesting large-eddy simulations within mesoscale simulations for wind energy applications

    SciTech Connect (OSTI)

    Lundquist, J K; Mirocha, J D; Chow, F K; Kosovic, B; Lundquist, K A

    2008-09-08

    With increasing demand for more accurate atmospheric simulations for wind turbine micrositing, for operational wind power forecasting, and for more reliable turbine design, simulations of atmospheric flow with resolution of tens of meters or higher are required. These time-dependent large-eddy simulations (LES), which resolve individual atmospheric eddies on length scales smaller than turbine blades and account for complex terrain, are possible with a range of commercial and open-source software, including the Weather Research and Forecasting (WRF) model. In addition to 'local' sources of turbulence within an LES domain, changing weather conditions outside the domain can also affect flow, suggesting that a mesoscale model provide boundary conditions to the large-eddy simulations. Nesting a large-eddy simulation within a mesoscale model requires nuanced representations of turbulence. Our group has improved the Weather and Research Forecasting model's (WRF) LES capability by implementing the Nonlinear Backscatter and Anisotropy (NBA) subfilter stress model following Kosovic (1997) and an explicit filtering and reconstruction technique to compute the Resolvable Subfilter-Scale (RSFS) stresses (following Chow et al, 2005). We have also implemented an immersed boundary method (IBM) in WRF to accommodate complex terrain. These new models improve WRF's LES capabilities over complex terrain and in stable atmospheric conditions. We demonstrate approaches to nesting LES within a mesoscale simulation for farms of wind turbines in hilly regions. Results are sensitive to the nesting method, indicating that care must be taken to provide appropriate boundary conditions, and to allow adequate spin-up of turbulence in the LES domain.

  15. THE NONLINEAR AND NONLOCAL LINK BETWEEN MACROSCOPIC ALFVÉNIC AND MICROSCOPIC ELECTROSTATIC SCALES IN THE SOLAR WIND

    SciTech Connect (OSTI)

    Valentini, F.; Vecchio, A.; Donato, S.; Carbone, V.; Veltri, P.; Briand, C.; Bougeret, J.

    2014-06-10

    The local heating of the solar-wind gas during its expansion represents one of the most intriguing problems in space plasma physics and is at present the subject of a relevant scientific effort. The possible mechanisms that could account for local heat production in the interplanetary medium are most likely related to the turbulent character of the solar-wind plasma. Nowadays, many observational and numerical analyses are devoted to the identification of fluctuation channels along which energy is carried from large to short wavelengths during the development of the turbulent cascade; these fluctuation channels establish the link between macroscopic and microscopic scales. In this Letter, by means of a quantitative comparison between in situ measurements in the solar wind from the STEREO spacecraft and numerical results from kinetic simulations, we identify an electrostatic channel of fluctuations that develops along the turbulent cascade in a direction parallel to the ambient magnetic field. This channel appears to be efficient in transferring the energy from large Alfvénic to short electrostatic acoustic-like scales up to a range of wavelengths where it can finally be turned into heat, even when the electron to proton temperature ratio is of the order of unity.

  16. Optimizing Cluster Heads for Energy Efficiency in Large-Scale...

    Office of Scientific and Technical Information (OSTI)

    Optimizing Cluster Heads for Energy Efficiency in Large-Scale Heterogeneous Wireless Sensor Networks Gu, Yi; Wu, Qishi; Rao, Nageswara S. V. Hindawi Publishing Corporation None...

  17. Energy Department Applauds Nation's First Large-Scale Industrial...

    Office of Environmental Management (EM)

    Large-Scale Industrial Carbon Capture, Storage Plant Begins Construction The 15,000 square-foot sustainably designed National Sequestration Education Center, located at Richland...

  18. Optimizing Cluster Heads for Energy Efficiency in Large-Scale...

    Office of Scientific and Technical Information (OSTI)

    clustering is generally considered as an efficient and scalable way to facilitate the management and operation of such large-scale networks and minimize the total energy...

  19. ORNL demonstrates first large-scale graphene fabrication | ornl...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    ORNL demonstrates first large-scale graphene composite fabrication ORNL's ultrastrong graphene features layers of graphene and polymers and is an effective conductor of...

  20. A Model for Turbulent Combustion Simulation of Large Scale Hydrogen...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    A Model for Turbulent Combustion Simulation of Large Scale Hydrogen Explosions Event Sponsor: Argonne Leadership Computing Facility Seminar Start Date: Oct 6 2015 - 10:00am...

  1. Energy Department Applauds Nation's First Large-Scale Industrial...

    Broader source: Energy.gov (indexed) [DOE]

    today's groundbreaking for construction of the nation's first large-scale industrial carbon capture and storage (ICCS) facility in Decatur, Illinois. Supported by the 2009...

  2. Effects of Volcanism, Crustal Thickness, and Large Scale Faulting...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Effects of Volcanism, Crustal Thickness, and Large Scale Faulting on the Development and Evolution of Geothermal Systems: Collaborative Project in Chile Effects of Volcanism,...

  3. Large Scale GSHP as Alternative Energy for American Farmers Geothermal...

    Open Energy Info (EERE)

    technologies, and remove the farming business risk associated with fluctuating fuel prices. PI Xu has many years experience in large scale GSHP for commercial and industrial...

  4. Optimization Online - A fictitious play approach to large-scale ...

    E-Print Network [OSTI]

    Theodore Lambert

    2004-08-01

    Aug 1, 2004 ... A fictitious play approach to large-scale optimization. Theodore Lambert (tlambert ***at*** tmcc.edu) Marina A. Epelman (mepelman ***at*** ...

  5. Advancing Cellulosic Ethanol for Large Scale Sustainable Transportation

    E-Print Network [OSTI]

    Wyman, C

    2007-01-01

    Advancing Cellulosic Ethanol for Large Scale SustainableHydrogen Batteries Nuclear By Lee Lynd, Dartmouth Ethanol •Ethanol, ethyl alcohol, fermentation ethanol, or just “

  6. Towards a Large-Scale Recording System: Demonstration of Polymer...

    Office of Scientific and Technical Information (OSTI)

    Towards a Large-Scale Recording System: Demonstration of Polymer-Based Penetrating Array for Chronic Neural Recording Citation Details In-Document Search Title: Towards a...

  7. An Occupied Subspace Optimization for Linear Scaling in LargeScale Ab Initio Electronic

    E-Print Network [OSTI]

    Raczkowski, David

    1 CONTENTS An Occupied Subspace Optimization for Linear Scaling in Large­Scale Ab Initio Electronic 2000 Physics An Occupied Subspace Optimization for Linear Scaling in Large Scale Ab Initio Electronic Structure Calculations Abstract We present an approach to electronic structure calcu­ lations that replaces

  8. Testing, Manufacturing, and Component Development Projects for Utility-Scale and Distributed Wind Energy, Fiscal Years 2006–2014

    SciTech Connect (OSTI)

    2014-04-01

    This report covers the Wind and Water Power Technologies Office's Testing, Manufacturing, and Component Development Projects for Utility-Scale and Distributed Wind Energy from 2006 to 2014.

  9. Parsec-scale accretion and winds irradiated by a quasar

    E-Print Network [OSTI]

    Dorodnitsyn, Anton; Proga, Daniel

    2015-01-01

    We present numerical simulations of properties of a parsec-scale torus exposed to illumination by the central black hole in an active galaxy (AGN). Our physical model allows to investigate the balance between the formation of winds and accretion simultaneously. Radiation-driven winds are allowed by taking into account radiation pressure due to UV and IR radiation along with X-ray heating and dust sublimation. Accretion is allowed through angular momentum transport and the solution of the equations of radiation hydrodynamics. Our methods adopt flux-limited diffusion radiation-hydrodynamics for the dusty, infrared pressure driven part of the flow, along with X-ray heating and cooling. Angular momentum transport in the accreting part of the flow is modeled using effective viscosity. Our results demonstrate that radiation pressure on dust can play an important role in shaping AGN obscuration. For example, when the luminosity illuminating the torus exceeds $L>0.01\\,L_{\\rm Edd}$, where $L_{\\rm Edd}$ is the Eddingto...

  10. Small Scale Energy Cascade of the Solar Wind Turbulence

    E-Print Network [OSTI]

    O. Alexandrova; V. Carbone; P. Veltri; L. Sorriso-Valvo

    2007-10-03

    Magnetic fluctuations in the solar wind are distributed according to Kolmogorov's power law $f^{-5/3}$ below the ion cyclotron frequency $f_{ci}$. Above this frequency, the observed steeper power law is usually interpreted in two different ways: a dissipative range of the solar wind turbulence or another turbulent cascade, the nature of which is still an open question. Using the Cluster magnetic data we show that after the spectral break the intermittency increases toward higher frequencies, indicating the presence of non-linear interactions inherent to a new inertial range and not to the dissipative range. At the same time the level of compressible fluctuations raises. We show that the energy transfer rate and intermittency are sensitive to the level of compressibility of the magnetic fluctuations within the small scale inertial range. We conjecture that the time needed to establish this inertial range is shorter than the eddy-turnover time, and is related to dispersive effects. A simple phenomenological model, based on the compressible Hall MHD, predicts the magnetic spectrum $\\sim k^{-7/3+2\\alpha}$, which depends on the degree of plasma compression $\\alpha$.

  11. Scaling anisotropy of the power in parallel and perpendicular components of the solar wind magnetic field

    E-Print Network [OSTI]

    Oughton, Sean

    Scaling anisotropy of the power in parallel and perpendicular components of the solar wind magnetic of the Power in Parallel and Perpendicular Components of the Solar Wind Magnetic Field Miriam A. Forman1 ZLWK GLVWDQFH IURP WKH 6XQ 7KLV GDWD LQFOXGHV WKH VRlar wind whose total power (Pxx + Pyy + Pzz#12; LQ

  12. EXPERIMENTS ON A SCALE MODEL OF A MONOLITHIC CONCRETE SPAR FOR FLOATING WIND TURBINES

    E-Print Network [OSTI]

    Politècnica de Catalunya, Universitat

    EXPERIMENTS ON A SCALE MODEL OF A MONOLITHIC CONCRETE SPAR FOR FLOATING WIND TURBINES Alexis Campos device, simulating the mean thrust force exerted by the wind turbine. To adjust the weight of the whole floating offshore wind turbines substructures. Preliminary studies of a concept consisting of a monolithic

  13. Global and multi-scale features of solar wind-magnetosphere coupling: From modeling to forecasting

    E-Print Network [OSTI]

    Sitnov, Mikhail I.

    Global and multi-scale features of solar wind-magnetosphere coupling: From modeling to forecasting issue. This paper presents a data-derived model of the solar wind-magnetosphere coupling that combines of solar wind-magnetosphere coupling: From modeling to forecasting, Geophys. Res. Lett., 31, L08802, doi:10

  14. Observation of Turbulent Intermittency Scaling with Magnetic Helicity in an MHD Plasma Wind Tunnel

    E-Print Network [OSTI]

    Brown, Michael R.

    Observation of Turbulent Intermittency Scaling with Magnetic Helicity in an MHD Plasma Wind Tunnel. An unstable spheromak injected into the MHD wind tunnel of the Swarthmore Spheromak Experiment displays. Differences in magnetic intermittent character have been seen between fast and slow solar wind turbulence [2

  15. Engineering Large scale separation and purification processes

    E-Print Network [OSTI]

    glassy polymers, polymer-selective nanoparticle hybrids and carbon molecular sieve (CMS) materials cover a heavy burden on available energy resources and lead to large increases in carbon dioxide emissions under a "business as usual" scenario. Advanced membrane and sorbent approaches that minimize energy intensive phase

  16. Delft Hydraulic's Large Wind-Wave Flume Paul van Vliet 1

    E-Print Network [OSTI]

    Jaehne, Bernd

    499 Delft Hydraulic's Large Wind-Wave Flume Paul van Vliet 1 , Frank Hering 2 , and Bernd J¨ahne 2,3 1 Waterloopkundig Laboratorium, Delft Hydraulics Laboratory Rotterdamseweg 185, NL-2692 HD Delft in the seventies, Delft Hydraulics large wind wave flume was totally overhauled to fit the needs of scientists

  17. Climate impacts of a large-scale biofuels expansion*

    E-Print Network [OSTI]

    Climate impacts of a large-scale biofuels expansion* Willow Hallgren, C. Adam Schlosser, Erwan impacts of a large-scale biofuels expansion Willow Hallgren,1 C. Adam Schlosser,1 Erwan Monier,1 David March 2013. [1] A global biofuels program will potentially lead to intense pressures on land supply

  18. Large-Scale Eucalyptus Energy Farms and Power Cogeneration1

    E-Print Network [OSTI]

    Large-Scale Eucalyptus Energy Farms and Power Cogeneration1 Robert C. Noronla2 The initiation of a large-scale cogeneration project, especially one that combines construction of the power generation supplemental fuel source must be sought if the cogeneration facility will consume more fuel than

  19. Markov Chain Analysis for Large-Scale Grid Systems

    E-Print Network [OSTI]

    Markov Chain Analysis for Large-Scale Grid Systems Christopher Dabrowski Fern Hunt NISTIR 7566 #12;2 #12;3 NISTIR 7566 Markov Chain Analysis for Large-Scale Grid Systems Christopher Dabrowski Software and Systems Division Information Technology Laboratory National Institute of Standards and Technology

  20. Large Scale Weather Control Using Nuclear Reactors

    E-Print Network [OSTI]

    Moninder Singh Modgil

    2002-10-02

    It is pointed out that controlled release of thermal energy from fission type nuclear reactors can be used to alter weather patterns over significantly large geographical regions. (1) Nuclear heat creates a low pressure region, which can be used to draw moist air from oceans, onto deserts. (2) Creation of low pressure zones over oceans using Nuclear heat can lead to Controlled Cyclone Creation (CCC).(3) Nuclear heat can also be used to melt glaciers and control water flow in rivers.

  1. Large Scale Weather Control Using Nuclear Reactors

    E-Print Network [OSTI]

    Singh-Modgil, M

    2002-01-01

    It is pointed out that controlled release of thermal energy from fission type nuclear reactors can be used to alter weather patterns over significantly large geographical regions. (1) Nuclear heat creates a low pressure region, which can be used to draw moist air from oceans, onto deserts. (2) Creation of low pressure zones over oceans using Nuclear heat can lead to Controlled Cyclone Creation (CCC).(3) Nuclear heat can also be used to melt glaciers and control water flow in rivers.

  2. South Carolina gearing up for wind boom

    Broader source: Energy.gov [DOE]

    Clemson University’s Restoration Institute will soon begin constructing a large-scale wind turbine testing facility.

  3. Autonomie Large Scale Deployment | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:FinancingPetroleum Based Fuels Research atDepartmentAuditsDepartment of(TEG)of Energy1Large

  4. Goethite Bench-scale and Large-scale Preparation Tests

    SciTech Connect (OSTI)

    Josephson, Gary B.; Westsik, Joseph H.

    2011-10-23

    The Hanford Waste Treatment and Immobilization Plant (WTP) is the keystone for cleanup of high-level radioactive waste from our nation's nuclear defense program. The WTP will process high-level waste from the Hanford tanks and produce immobilized high-level waste glass for disposal at a national repository, low activity waste (LAW) glass, and liquid effluent from the vitrification off-gas scrubbers. The liquid effluent will be stabilized into a secondary waste form (e.g. grout-like material) and disposed on the Hanford site in the Integrated Disposal Facility (IDF) along with the low-activity waste glass. The major long-term environmental impact at Hanford results from technetium that volatilizes from the WTP melters and finally resides in the secondary waste. Laboratory studies have indicated that pertechnetate ({sup 99}TcO{sub 4}{sup -}) can be reduced and captured into a solid solution of {alpha}-FeOOH, goethite (Um 2010). Goethite is a stable mineral and can significantly retard the release of technetium to the environment from the IDF. The laboratory studies were conducted using reaction times of many days, which is typical of environmental subsurface reactions that were the genesis of this new process. This study was the first step in considering adaptation of the slow laboratory steps to a larger-scale and faster process that could be conducted either within the WTP or within the effluent treatment facility (ETF). Two levels of scale-up tests were conducted (25x and 400x). The largest scale-up produced slurries of Fe-rich precipitates that contained rhenium as a nonradioactive surrogate for {sup 99}Tc. The slurries were used in melter tests at Vitreous State Laboratory (VSL) to determine whether captured rhenium was less volatile in the vitrification process than rhenium in an unmodified feed. A critical step in the technetium immobilization process is to chemically reduce Tc(VII) in the pertechnetate (TcO{sub 4}{sup -}) to Tc(Iv)by reaction with the ferrous ion, Fe{sup 2+}-Fe{sup 2+} is oxidized to Fe{sup 3+} - in the presence of goethite seed particles. Rhenium does not mimic that process; it is not a strong enough reducing agent to duplicate the TcO{sub 4}{sup -}/Fe{sup 2+} redox reactions. Laboratory tests conducted in parallel with these scaled tests identified modifications to the liquid chemistry necessary to reduce ReO{sub 4}{sup -} and capture rhenium in the solids at levels similar to those achieved by Um (2010) for inclusion of Tc into goethite. By implementing these changes, Re was incorporated into Fe-rich solids for testing at VSL. The changes also changed the phase of iron that was in the slurry product: rather than forming goethite ({alpha}-FeOOH), the process produced magnetite (Fe{sub 3}O{sub 4}). Magnetite was considered by Pacific Northwest National Laboratory (PNNL) and VSL to probably be a better product to improve Re retention in the melter because it decomposes at a higher temperature than goethite (1538 C vs. 136 C). The feasibility tests at VSL were conducted using Re-rich magnetite. The tests did not indicate an improved retention of Re in the glass during vitrification, but they did indicate an improved melting rate (+60%), which could have significant impact on HLW processing. It is still to be shown whether the Re is a solid solution in the magnetite as {sup 99}Tc was determined to be in goethite.

  5. Aalborg Universitet Harmonic models of a back-to-back converter in large offshore wind farms compared

    E-Print Network [OSTI]

    Bak, Claus Leth

    Aalborg Universitet Harmonic models of a back-to-back converter in large offshore wind farms-to-back converter in large offshore wind farms compared with measurement data. In Proceedings of Nordic Wind Power from vbn.aau.dk on: juli 04, 2015 #12; Abstract--The offshore wind farm with installed back-to- back

  6. Superconducting materials for large scale applications

    SciTech Connect (OSTI)

    Scanlan, Ronald M.; Malozemoff, Alexis P.; Larbalestier, David C.

    2004-05-06

    Significant improvements in the properties ofsuperconducting materials have occurred recently. These improvements arebeing incorporated into the latest generation of wires, cables, and tapesthat are being used in a broad range of prototype devices. These devicesinclude new, high field accelerator and NMR magnets, magnets for fusionpower experiments, motors, generators, and power transmission lines.These prototype magnets are joining a wide array of existing applicationsthat utilize the unique capabilities of superconducting magnets:accelerators such as the Large Hadron Collider, fusion experiments suchas ITER, 930 MHz NMR, and 4 Tesla MRI. In addition, promising newmaterials such as MgB2 have been discovered and are being studied inorder to assess their potential for new applications. In this paper, wewill review the key developments that are leading to these newapplications for superconducting materials. In some cases, the key factoris improved understanding or development of materials with significantlyimproved properties. An example of the former is the development of Nb3Snfor use in high field magnets for accelerators. In other cases, thedevelopment is being driven by the application. The aggressive effort todevelop HTS tapes is being driven primarily by the need for materialsthat can operate at temperatures of 50 K and higher. The implications ofthese two drivers for further developments will be discussed. Finally, wewill discuss the areas where further improvements are needed in order fornew applications to be realized.

  7. Stabilization of Large Scale Structure by Adhesive Gravitational Clustering

    E-Print Network [OSTI]

    Thomas Buchert

    1999-08-13

    The interplay between gravitational and dispersive forces in a multi-streamed medium leads to an effect which is exposed in the present note as the genuine driving force of stabilization of large-scale structure. The conception of `adhesive gravitational clustering' is advanced to interlock the fairly well-understood epoch of formation of large-scale structure and the onset of virialization into objects that are dynamically in equilibrium with their large-scale structure environment. The classical `adhesion model' is opposed to a class of more general models traced from the physical origin of adhesion in kinetic theory.

  8. How Three Retail Buyers Source Large-Scale Solar Electricity

    Broader source: Energy.gov [DOE]

    Large-scale, non-utility solar power purchase agreements (PPAs) are still a rarity despite the growing popularity of PPAs across the country. In this webinar, participants will learn more about how...

  9. LARGE-SCALE CORONAL PROPAGATING FRONTS IN SOLAR ERUPTIONS AS...

    Office of Scientific and Technical Information (OSTI)

    LARGE-SCALE CORONAL PROPAGATING FRONTS IN SOLAR ERUPTIONS AS OBSERVED BY THE ATMOSPHERIC IMAGING ASSEMBLY ON BOARD THE SOLAR DYNAMICS OBSERVATORY-AN ENSEMBLE STUDY Re-direct...

  10. Surrogate modeling for large-scale black-box systems

    E-Print Network [OSTI]

    Liem, Rhea Patricia

    2007-01-01

    This research introduces a systematic method to reduce the complexity of large-scale blackbox systems for which the governing equations are unavailable. For such systems, surrogate models are critical for many applications, ...

  11. Exploration of large scale manufacturing of polydimethylsiloxane (PDMS) microfluidic devices

    E-Print Network [OSTI]

    Hum, Philip W. (Philip Wing-Jung)

    2006-01-01

    Discussion of the current manufacturing process of polydimethylsiloxane (PDMS) parts and the emergence of PDMS use in biomedical microfluidic devices addresses the need to develop large scale manufacturing processes for ...

  12. Large Scale Computing and Storage Requirements for High Energy Physics

    E-Print Network [OSTI]

    Gerber, Richard A.

    2011-01-01

    Journal of Computational Physics, Large Scale Computing andRequirements for High Energy Physics [3] A. S. Almgren, J.Journal of Computational Physics, 87:171–200, 1990. [7] G.

  13. Infrastructure for large-scale tests in marine autonomy

    E-Print Network [OSTI]

    Hummel, Robert A. (Robert Andrew)

    2012-01-01

    This thesis focuses on the development of infrastructure for research with large-scale autonomous marine vehicle fleets and the design of sampling trajectories for compressive sensing (CS). The newly developed infrastructure ...

  14. Platforms and real options in large-scale engineering systems

    E-Print Network [OSTI]

    Kalligeros, Konstantinos C., 1976-

    2006-01-01

    This thesis introduces a framework and two methodologies that enable engineering management teams to assess the value of real options in programs of large-scale, partially standardized systems implemented a few times over ...

  15. The Promise Of Data Grouping In Large Scale Storage Systems

    E-Print Network [OSTI]

    Wildani, Avani

    2013-01-01

    Martin. Why traditional storage systems donâ??t help us saveB. Dufrasne et al. IBM XIV Storage System Gen3 Architecture,in large scale storage systems. In Proceedings of the 11th

  16. Interference management techniques in large-scale wireless networks 

    E-Print Network [OSTI]

    Luo, Yi

    2015-06-29

    In this thesis, advanced interference management techniques are designed and evaluated for large-scale wireless networks with realistic assumptions, such as signal propagation loss, random node distribution and ...

  17. Channel Meander Migration in Large-Scale Physical Model Study 

    E-Print Network [OSTI]

    Yeh, Po Hung

    2010-10-12

    A set of large-scale laboratory experiments were conducted to study channel meander migration. Factors affecting the migration of banklines, including the ratio of curvature to channel width, bend angle, and the Froude number were tested...

  18. Data mining techniques for large-scale gene expression analysis

    E-Print Network [OSTI]

    Palmer, Nathan Patrick

    2011-01-01

    Modern computational biology is awash in large-scale data mining problems. Several high-throughput technologies have been developed that enable us, with relative ease and little expense, to evaluate the coordinated expression ...

  19. Wind Speed Forecasting for Power System Operation 

    E-Print Network [OSTI]

    Zhu, Xinxin

    2013-07-22

    In order to support large-scale integration of wind power into current electric energy system, accurate wind speed forecasting is essential, because the high variation and limited predictability of wind pose profound challenges to the power system...

  20. Characterizing Inflow Conditions Across the Rotor Disk of a Utility-Scale Wind Turbine (Poster)

    SciTech Connect (OSTI)

    Clifton, A.; Lundquist, J. K.; Kelley, N.; Scott, G.; Jager, D.; Schreck, S.

    2012-01-01

    Multi-megawatt utility-scale wind turbines operate in a turbulent, thermally-driven atmosphere where wind speed and air temperature vary with height. Turbines convert the wind's momentum into electrical power, and so changes in the atmosphere across the rotor disk influence the power produced by the turbine. To characterize the inflow into utility scale turbines at the National Wind Technology Center (NWTC) near Boulder, Colorado, NREL recently built two 135-meter inflow monitoring towers. This poster introduces the towers and the measurements that are made, showing some of the data obtained in the first few months of operation in 2011.

  1. Floating Offshore Wind Turbine Dynamics: Large-Angle Motions in Euler-Space

    E-Print Network [OSTI]

    Sweetman, Bert

    Floating Offshore Wind Turbine Dynamics: Large-Angle Motions in Euler-Space Bert Sweetman Texas A offshore wind turbines beyond sight of land, where waters tend to be deeper, and use of floating structures&M University Lei Wang Texas A&M University Abstract: Floating structures have been proposed to support offshore

  2. innovati nNREL Confirms Large Potential for Grid Integration of Wind, Solar Power

    E-Print Network [OSTI]

    innovati nNREL Confirms Large Potential for Grid Integration of Wind, Solar Power To fully harvest, examining the east and west sections of the U.S. power grid. The studies show that it is technically the nation's bountiful wind and solar resources, it is critical to know how much electrical power from

  3. Modeling emergent large-scale structures of barchan dune fields

    E-Print Network [OSTI]

    Claudin, Philippe

    Modeling emergent large-scale structures of barchan dune fields S. Worman , A.B. Murray , R, barchan dunes typically exist as members of larger fields that display strik- ing, enigmatic structures that cannot be readily explained by examining the dynamics at the scale of single dunes, or by appealing

  4. SPECTRAL SLOPE VARIATION AT PROTON SCALES FROM FAST TO SLOW SOLAR WIND

    SciTech Connect (OSTI)

    Bruno, R.; Trenchi, L.; Telloni, D.

    2014-09-20

    We investigated the behavior of the spectral slope of interplanetary magnetic field fluctuations at proton scales for selected high-resolution time intervals from the WIND and MESSENGER spacecraft at 1 AU and 0.56 AU, respectively. The analysis was performed within the profile of high-speed streams, moving from fast to slow wind regions. The spectral slope showed a large variability between –3.75 and –1.75 and a robust tendency for this parameter to be steeper within the trailing edge, where the speed is higher, and to be flatter within the subsequent slower wind, following a gradual transition between these two states. The value of the spectral index seems to depend firmly on the power associated with the fluctuations within the inertial range; the higher the power, the steeper the slope. Our results support previous analyses suggesting that there must be some response of the dissipation mechanism to the level of the energy transfer rate along the inertial range.

  5. Materials Availability Expands the Opportunity for Large-Scale

    E-Print Network [OSTI]

    Kammen, Daniel M.

    , 2009. Accepted January 22, 2009. Solar photovoltaics have great promise for a low-carbon future­3). Solar photovoltaics (PV) are frequently cited as a promising but an economically unre- alistic largeMaterials Availability Expands the Opportunity for Large-Scale Photovoltaics Deployment C Y R U S W

  6. Hi-LION: Hierarchical Large-Scale Interconnection Optical Network

    E-Print Network [OSTI]

    Yoo, S. J. Ben

    Hi-LION: Hierarchical Large-Scale Interconnection Optical Network With AWGRs [Invited] Zheng Cao, Roberto Proietti, and S. J. B. Yoo Abstract--This paper proposes Hi-LION, a hierarchical large wavelength routing property of AWGRs together with electrical switching inside the processors, Hi-LION can

  7. Scaling relations for molecular gas in the Large Magellanic Cloud

    E-Print Network [OSTI]

    Hardcastle, Martin

    Scaling relations for molecular gas in the Large Magellanic Cloud By A r t o H e i kk i l ¨a e (virial mass versus CO luminosity, luminosity versus size, linewidth versus size) for molecular clouds in the 30 Dor and N 159 regions in the Large Magel­ lanic Cloud. The analysis is based on CO J = 1 ! 0

  8. Lessons from Large-Scale Renewable Energy Integration Studies: Preprint

    SciTech Connect (OSTI)

    Bird, L.; Milligan, M.

    2012-06-01

    In general, large-scale integration studies in Europe and the United States find that high penetrations of renewable generation are technically feasible with operational changes and increased access to transmission. This paper describes other key findings such as the need for fast markets, large balancing areas, system flexibility, and the use of advanced forecasting.

  9. Large Eddy Simulation studies of the effects of alignment and wind farm length

    E-Print Network [OSTI]

    Stevens, Richard J A M; Meneveau, Charles

    2014-01-01

    Large eddy simulations of wind farms are performed to study the effects of wind turbine row alignment with respect to the incoming flow direction. Various wind farms with fixed stream-wise spacing (7.85 rotor diameters) and varying lateral displacements and span-wise turbine spacings are considered, for a fixed inflow direction. Simulations show that, contrary to common belief, a perfectly staggered (checker-board) configuration does not necessarily give the highest average power output. Instead, the highest mean wind farm power output is found to depend on several factors, the most important one being the alignment that leads to minimization of wake effects from turbines in several upstream rows. This alignment typically occurs at significantly smaller angles than those corresponding to perfect staggering. The observed trends have implications for wind farm designs, especially in sites with a well-defined prevailing wind direction.

  10. EINSTEIN'S SIGNATURE IN COSMOLOGICAL LARGE-SCALE STRUCTURE

    SciTech Connect (OSTI)

    Bruni, Marco; Hidalgo, Juan Carlos; Wands, David

    2014-10-10

    We show how the nonlinearity of general relativity generates a characteristic nonGaussian signal in cosmological large-scale structure that we calculate at all perturbative orders in a large-scale limit. Newtonian gravity and general relativity provide complementary theoretical frameworks for modeling large-scale structure in ?CDM cosmology; a relativistic approach is essential to determine initial conditions, which can then be used in Newtonian simulations studying the nonlinear evolution of the matter density. Most inflationary models in the very early universe predict an almost Gaussian distribution for the primordial metric perturbation, ?. However, we argue that it is the Ricci curvature of comoving-orthogonal spatial hypersurfaces, R, that drives structure formation at large scales. We show how the nonlinear relation between the spatial curvature, R, and the metric perturbation, ?, translates into a specific nonGaussian contribution to the initial comoving matter density that we calculate for the simple case of an initially Gaussian ?. Our analysis shows the nonlinear signature of Einstein's gravity in large-scale structure.

  11. The Phoenix series large scale LNG pool fire experiments.

    SciTech Connect (OSTI)

    Simpson, Richard B.; Jensen, Richard Pearson; Demosthenous, Byron; Luketa, Anay Josephine; Ricks, Allen Joseph; Hightower, Marion Michael; Blanchat, Thomas K.; Helmick, Paul H.; Tieszen, Sheldon Robert; Deola, Regina Anne; Mercier, Jeffrey Alan; Suo-Anttila, Jill Marie; Miller, Timothy J.

    2010-12-01

    The increasing demand for natural gas could increase the number and frequency of Liquefied Natural Gas (LNG) tanker deliveries to ports across the United States. Because of the increasing number of shipments and the number of possible new facilities, concerns about the potential safety of the public and property from an accidental, and even more importantly intentional spills, have increased. While improvements have been made over the past decade in assessing hazards from LNG spills, the existing experimental data is much smaller in size and scale than many postulated large accidental and intentional spills. Since the physics and hazards from a fire change with fire size, there are concerns about the adequacy of current hazard prediction techniques for large LNG spills and fires. To address these concerns, Congress funded the Department of Energy (DOE) in 2008 to conduct a series of laboratory and large-scale LNG pool fire experiments at Sandia National Laboratories (Sandia) in Albuquerque, New Mexico. This report presents the test data and results of both sets of fire experiments. A series of five reduced-scale (gas burner) tests (yielding 27 sets of data) were conducted in 2007 and 2008 at Sandia's Thermal Test Complex (TTC) to assess flame height to fire diameter ratios as a function of nondimensional heat release rates for extrapolation to large-scale LNG fires. The large-scale LNG pool fire experiments were conducted in a 120 m diameter pond specially designed and constructed in Sandia's Area III large-scale test complex. Two fire tests of LNG spills of 21 and 81 m in diameter were conducted in 2009 to improve the understanding of flame height, smoke production, and burn rate and therefore the physics and hazards of large LNG spills and fires.

  12. Sandia Energy - Scaled Wind Farm Technology (SWIFT) Facility...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    wakes denoted by white helices and white fog. Development of the SWIFT Facility wind turbines reached a critical milestone this week, with the successful ground testing of the new...

  13. Large Scale Cosmic Microwave Background Anisotropies and Dark Energy

    E-Print Network [OSTI]

    J. Weller; A. M. Lewis

    2003-08-29

    In this note we investigate the effects of perturbations in a dark energy component with a constant equation of state on large scale cosmic microwave background anisotropies. The inclusion of perturbations increases the large scale power. We investigate more speculative dark energy models with w<-1 and find the opposite behaviour. Overall the inclusion of perturbations in the dark energy component increases the degeneracies. We generalise the parameterization of the dark energy fluctuations to allow for an arbitrary const ant sound speeds and show how constraints from cosmic microwave background experiments change if this is included. Combining cosmic microwave background with large scale structure, Hubble parameter and Supernovae observations we obtain w=-1.02+-0.16 (1 sigma) as a constraint on the equation of state, which is almost independent of the sound speed chosen. With the presented analysis we find no significant constraint on the constant speed of sound of the dark energy component.

  14. Final Technical Report Laramie County Community College: Utility-Scale Wind Energy Technology

    SciTech Connect (OSTI)

    Douglas P. Cook

    2012-05-22

    The Utility-Scale Wind Energy Technology U.S. Department of Energy (DOE) grant EE0000538, provided a way ahead for Laramie County Community College (LCCC) to increase educational and training opportunities for students seeking an Associate of Applied Science (AAS) or Associate of Science (AS) degree in Wind Energy Technology. The DOE grant enabled LCCC to program, schedule, and successfully operate multiple wind energy technology cohorts of up to 20-14 students per cohort simultaneously. As of this report, LCCC currently runs four cohorts. In addition, the DOE grant allowed LCCC to procure specialized LABVOLT electronic equipment that directly supports is wind energy technology curriculum.

  15. A Model of Plasma Heating by Large-Scale Flow

    E-Print Network [OSTI]

    Pongkitiwanichakul, P; Boldyrev, S; Mason, J; Perez, J C

    2015-01-01

    In this work we study the process of energy dissipation triggered by a slow large scale motion of a magnetized conducting fluid. Our consideration is motivated by the problem of heating the solar corona, which is believed to be governed by fast reconnection events set off by the slow motion of magnetic field lines anchored in the photospheric plasma. To elucidate the physics governing the disruption of the imposed laminar motion and the energy transfer to small scales, we propose a simplified model where the large-scale motion of magnetic field lines is prescribed not at the footpoints but rather imposed volumetrically. As a result, the problem can be treated numerically with an efficient, highly-accurate spectral method, allowing us to use a resolution and statistical ensemble exceeding those of the previous work. We find that, even though the large-scale deformations are slow, they eventually lead to reconnection events that drive a turbulent state at smaller scales. The small-scale turbulence displays many...

  16. Large-scale cosmic flows and moving dark energy

    E-Print Network [OSTI]

    Jose Beltran Jimenez; Antonio L. Maroto

    2009-02-24

    Large-scale matter bulk flows with respect to the cosmic microwave background have very recently been detected on scales 100 Mpc/h and 300 Mpc/h by using two different techniques showing an excellent agreement in the motion direction. However, the unexpectedly large measured amplitudes are difficult to understand within the context of standard LCDM cosmology. In this work we show that the existence of such a flow could be signaling the presence of moving dark energy at the time when photons decoupled from matter. We also comment on the relation between the direction of the CMB dipole and the preferred axis observed in the quadrupole in this scenario.

  17. 2 Large CO2 reductions via offshore wind power matched to inherent 3 storage in energy end-uses

    E-Print Network [OSTI]

    Firestone, Jeremy

    2 Large CO2 reductions via offshore wind power matched to inherent 3 storage in energy end-uses 4] We develop methods for assessing offshore wind 9 resources, using a model of the vertical structure. Dhanju, R. W. 26 Garvine, and M. Z. Jacobson (2007), Large CO2 reductions via 27 offshore wind power

  18. Clamp for use in winding large magnet coils

    DOE Patents [OSTI]

    Brown, R.L.; Kenney, W.J.

    1981-05-05

    In one aspect, the invention is a novel arrangement for applying forces to turns of a vertically extending helical coil which is wound about a support. The apparatus includes a first rigid member extending towards the turns. A second rigid member extends transversely from the end of the first and has a vertically extending face provided with a generally straight groove extending transversely of the turns. A longitudinal passage in the first member connects to the groove to form therewith a continuous guideway for rollable articles. A rigid lug longitudinally movable in the groove is provided with a projection which extends out of the groove and beneath the bottom of a selected turn of the coil. A train of rigid, rollable articles is disposed in the guideway inwardly of the lug. Means are provided for applying force to that end of the train which is relatively remote from the lug, to urge the latter against the bottom face of the selected turn. As a result, that turn is moved upward along the face of the support, establishing a selected spacing between that turn and the previously formed turn of the coil. When upward movement of the selected turn stops, the force applied to the lug immediately translates to a force which urges the above-mentioned grooved face against all of the formed turns, thus compressing them against the support. The above-mentioned first and second members are swingably mounted so that they can be temporarily moved out of the winding path, thus permitting continuous winding.

  19. PERSPECTIVES This large-scale variation in base compo-

    E-Print Network [OSTI]

    Eyre-Walker, Adam

    ,000 kb kb 2,500 3,000 3,500 4,000 b Class II Class III Class I Figure 1 | Large-scale variation in G+C, according to its G+C content, by ultracentrifugation, and found that there was substantial variation in its mammals and birds, and that the G+C content of large (>300-kb) blocks of DNA varied from ~35 to 55

  20. Utility Scale Wind Turbines on a Grid Connected Island Mohit Dua, Anthony L. Rogers, James F. Manwell,

    E-Print Network [OSTI]

    Massachusetts at Amherst, University of

    Utility Scale Wind Turbines on a Grid Connected Island Mohit Dua, Anthony L. Rogers, James F utility scale wind turbines on Fox Islands, located 12 miles from the coast of Maine in the United States of electricity itself. Three locations are analyzed in detail as potential sites for wind turbine installations

  1. Full-scale wind turbine rotor aerodynamics research

    SciTech Connect (OSTI)

    Simms, D A; Butterfield, C P

    1994-11-01

    The United States Department of Energy and the National Renewable Energy Laboratory (NREL) are conducting research to improve wind turbine technology at the NREL National Wind Technology Center (NWTC). One program, the Combined Experiment, has focused on making measurements needed to understand aerodynamic and structural responses of horizontal-axis wind turbines (HAWT). A new phase of this program, the Unsteady Aerodynamics Experiment, will focus on quantifying unsteady aerodynamic phenomena prevalent in stall-controlled HAWTs. Optimally twisted blades and innovative instrumentation and data acquisition systems will be used in these tests. Data can now be acquired and viewed interactively during turbine operations. This paper describes the NREL Unsteady Aerodynamics Experiment and highlights planned future research activities.

  2. Harmonic influence in large-scale networks Daron Acemoglu

    E-Print Network [OSTI]

    Como, Giacomo

    Harmonic influence in large-scale networks Daron Acemoglu , Giacomo Como , Fabio Fagnani , and Asuman Ozdaglar§ 1. INTRODUCTION Harmonic influence has been recently introduced as a measure = 0 and xs1 = 1, respectively, the harmonic influence vector x measures the relative influence of s1

  3. A Reconfigurable Fabric for Accelerating Large-Scale Datacenter Services

    E-Print Network [OSTI]

    Hauck, Scott

    A Reconfigurable Fabric for Accelerating Large-Scale Datacenter Services Andrew Putnam, Adrian M, Doug Burger Abstract To advance datacenter capabilities beyond what commodity server designs can,632 servers and FPGAs in a production datacenter and successfully used to accelerate the ranking portion

  4. Evolving Large Scale UAV Communication System Adrian Agogino

    E-Print Network [OSTI]

    Tumer, Kagan

    Evolving Large Scale UAV Communication System Adrian Agogino UCSC at NASA Ames Mail Stop 269 Corvallis, OR 97331 Kagan.Tumer@ oregonstate.edu ABSTRACT Unmanned Aerial Vehicles (UAVs) have traditionally powered unmanned aerial vehicles (UAVs) to fly long term missions at high altitudes. This will revo

  5. Characterizing Google Hacking: A First Large-Scale Quantitative Study

    E-Print Network [OSTI]

    Gu, Guofei

    Characterizing Google Hacking: A First Large-Scale Quantitative Study Jialong Zhang, Jayant Notani.com Abstract. Google Hacking continues to be abused by attackers to find vulnerable websites on current the characteristics of vulnerabilities targeted by Google Hacking (e.g., what kind of vulnerabilities are typically

  6. Optimal Transmission Radius for Flooding in Large Scale Sensor Networks

    E-Print Network [OSTI]

    Krishnamachari, Bhaskar

    1 Optimal Transmission Radius for Flooding in Large Scale Sensor Networks Marco Z´u~niga Z and bandwidth resources, the flooded packet may keep the transmission medium within the network busy for too long, reducing overall network throughput. We analyze the impact of the transmission radius

  7. Optimal Transmission Radius for Flooding in Large Scale Sensor Networks

    E-Print Network [OSTI]

    Krishnamachari, Bhaskar

    1 Optimal Transmission Radius for Flooding in Large Scale Sensor Networks Marco Z´u~niga Z. If the transmission radius is not set optimally, the flooded packet may be holding the transmission medium for longer periods than are necessary, reducing overall network throughput. We analyze the impact of the transmission

  8. IFIP/IEEE International Conference on Very Large Scale Integration

    E-Print Network [OSTI]

    Pierre, Laurence

    -Signal IC Design · 3-D Integration · Physical Design · SoC Design for Variability, Reliability, Fault22nd IFIP/IEEE International Conference on Very Large Scale Integration VLSI-SoC 2014 October 6-8, 2014 Playa del Carmen, Mexico Iberostar Tucán and Quetzal Hotel General Chairs: Arturo Sarmiento Reyes

  9. PERSPECTIVE SPECIAL SERIES IN LARGE-SCALE BIOLOGY

    E-Print Network [OSTI]

    Gent, Universiteit

    PERSPECTIVE SPECIAL SERIES IN LARGE-SCALE BIOLOGY PLAZA: a comparative genomics resource to study gene and genome evolution in plants Sebastian Proost1,2+ , Michiel Van Bel1,2+ , Lieven Sterck1: comparative genomics, evolution, colinearity, gene family, plants Running title: Comparative genomics

  10. Feasibility Study of Large Scale Photosynthetic Biohydrogen Greg Burgess1

    E-Print Network [OSTI]

    Feasibility Study of Large Scale Photosynthetic Biohydrogen Production Greg Burgess1 , Joel Freeman.Burgess@anu.edu.au, Javier.Fernandez@rsbs.anu.edu.au, Keith.Lovegrove@anu.edu.au A method of industrial production, the same as in some non-biological systems of H2 production. In normal conditions in algae and all plants

  11. Large-scale Scene Understanding Challenge: Eye Tracking Saliency Estimation

    E-Print Network [OSTI]

    Xiao, Jianxiong

    Large-scale Scene Understanding Challenge: Eye Tracking Saliency Estimation Yinda Zhang, Fisher Yu of eye tracking saliency challenge is to generate a saliency map (Fig. 1(c)), which can predict map and unzip them in to a same folder, e.g. Root. The raw images are collected from SUN database [2

  12. Supplementary Material: Large Scale Read Classification for Next Generation Sequencing

    E-Print Network [OSTI]

    Liang, Huizhi "Elly"

    genomics. 1 Introduction This document provides a list of sequences used in the study Large Scale Read.3 Bordetella bronchiseptica RB50 chromosome, complete genome 2 Negative NC_009495.1 Clostridium botulinum A str. ATCC 3502 chromosome, complete genome 2 Negative NC_022121.1 Chlamydia trachomatis strain J/31

  13. Large-Scale Streamwise Turbulent Structures in Hypersonic Boundary Layers 

    E-Print Network [OSTI]

    English, Benjamin L.

    2013-04-22

    Prior research in the field of boundary layer turbulence has identified streamwise-elongated large-scale turbulence structures in both low speed compressible and high speed (M=2.0) flow. No experimental work has been done in any flow of M> or =3...

  14. LARGE-SCALE MOTIONS IN THE PERSEUS GALAXY CLUSTER

    SciTech Connect (OSTI)

    Simionescu, A.; Werner, N.; Urban, O.; Allen, S. W.; Fabian, A. C.; Sanders, J. S.; Mantz, A.; Nulsen, P. E. J.; Takei, Y.

    2012-10-01

    By combining large-scale mosaics of ROSAT PSPC, XMM-Newton, and Suzaku X-ray observations, we present evidence for large-scale motions in the intracluster medium of the nearby, X-ray bright Perseus Cluster. These motions are suggested by several alternating and interleaved X-ray bright, low-temperature, low-entropy arcs located along the east-west axis, at radii ranging from {approx}10 kpc to over a Mpc. Thermodynamic features qualitatively similar to these have previously been observed in the centers of cool-core clusters, and were successfully modeled as a consequence of the gas sloshing/swirling motions induced by minor mergers. Our observations indicate that such sloshing/swirling can extend out to larger radii than previously thought, on scales approaching the virial radius.

  15. Performance Health Monitoring of Large-Scale Systems

    SciTech Connect (OSTI)

    Rajamony, Ram

    2014-11-20

    This report details the progress made on the ASCR funded project Performance Health Monitoring for Large Scale Systems. A large-­?scale application may not achieve its full performance potential due to degraded performance of even a single subsystem. Detecting performance faults, isolating them, and taking remedial action is critical for the scale of systems on the horizon. PHM aims to develop techniques and tools that can be used to identify and mitigate such performance problems. We accomplish this through two main aspects. The PHM framework encompasses diagnostics, system monitoring, fault isolation, and performance evaluation capabilities that indicates when a performance fault has been detected, either due to an anomaly present in the system itself or due to contention for shared resources between concurrently executing jobs. Software components called the PHM Control system then build upon the capabilities provided by the PHM framework to mitigate degradation caused by performance problems.

  16. A steady-state L-mode tokamak fusion reactor : large scale and minimum scale

    E-Print Network [OSTI]

    Reed, Mark W. (Mark Wilbert)

    2010-01-01

    We perform extensive analysis on the physics of L-mode tokamak fusion reactors to identify (1) a favorable parameter space for a large scale steady-state reactor and (2) an operating point for a minimum scale steady-state ...

  17. Linear Scaling 3D Fragment Method for Large-scale Electronic Structure Calculations

    E-Print Network [OSTI]

    Linear Scaling 3D Fragment Method for Large-scale Electronic Structure Calculations Lin-Wang Wang devices or optical devices like solar cells. Understanding the electronic structures of such systems structure, the charge density, the total energy and the atomic forces of a material system

  18. Small-scale thin film experiments provide models for large-scale engineering applications

    E-Print Network [OSTI]

    Reis, Pedro Miguel

    Small-scale thin film experiments provide models for large-scale engineering applicationsMIT's Department of Civil and Environmental Engineering · http://cee.mit.edu Delamination occurs in a thin film blisters occur in a predictable manner. Photo / Donna Coveney, MIT PROBLEM Thin films are omnipresent

  19. Primordial quantum nonequilibrium and large-scale cosmic anomalies

    E-Print Network [OSTI]

    Samuel Colin; Antony Valentini

    2015-06-12

    We study incomplete relaxation to quantum equilibrium at long wavelengths, during a pre-inflationary phase, as a possible explanation for the reported large-scale anomalies in the cosmic microwave background (CMB). Our scenario makes use of the de Broglie-Bohm pilot-wave formulation of quantum theory, in which the Born probability rule has a dynamical origin. The large-scale power deficit could arise from incomplete relaxation for the amplitudes of the primordial perturbations. We show, by numerical simulations for a spectator scalar field, that if the pre-inflationary era is radiation dominated then the deficit in the emerging power spectrum will have a characteristic shape (an inverse-tangent dependence on wavenumber k, with oscillations). It is found that our scenario is able to produce a power deficit in the observed region and of the observed (approximate) magnitude for an appropriate choice of cosmological parameters. We also discuss the large-scale anisotropy, which might arise from incomplete relaxation for the phases of the primordial perturbations. We present numerical simulations for phase relaxation, and we show how to define characteristic scales for amplitude and phase nonequilibrium. The extent to which the data might support our scenario is left as a question for future work. Our results suggest that we have a potentially viable model that might explain two apparently independent cosmic anomalies by means of a single mechanism.

  20. Geospatial Optimization of Siting Large-Scale Solar Projects

    SciTech Connect (OSTI)

    Macknick, J.; Quinby, T.; Caulfield, E.; Gerritsen, M.; Diffendorfer, J.; Haines, S.

    2014-03-01

    Recent policy and economic conditions have encouraged a renewed interest in developing large-scale solar projects in the U.S. Southwest. However, siting large-scale solar projects is complex. In addition to the quality of the solar resource, solar developers must take into consideration many environmental, social, and economic factors when evaluating a potential site. This report describes a proof-of-concept, Web-based Geographical Information Systems (GIS) tool that evaluates multiple user-defined criteria in an optimization algorithm to inform discussions and decisions regarding the locations of utility-scale solar projects. Existing siting recommendations for large-scale solar projects from governmental and non-governmental organizations are not consistent with each other, are often not transparent in methods, and do not take into consideration the differing priorities of stakeholders. The siting assistance GIS tool we have developed improves upon the existing siting guidelines by being user-driven, transparent, interactive, capable of incorporating multiple criteria, and flexible. This work provides the foundation for a dynamic siting assistance tool that can greatly facilitate siting decisions among multiple stakeholders.

  1. Optimal site selection and sizing of distributed utility-scale wind power plants

    SciTech Connect (OSTI)

    Milligan, M.R. [National Renewable Energy Lab., Golden, CO (United States); Artig, R. [Minnesota Dept. of Public Service, St. Paul, MN (United States)

    1998-04-01

    As electric market product unbundling occurs, sellers in the wholesale market for electricity will find it to their advantage to be able to specify the quantity of electricity available and the time of availability. Since wind power plants are driven by the stochastic nature of the wind itself, this can present difficulties. To the extent that an accurate wind forecast is available, contract deviations, and therefore penalties, can be significantly reduced. Even though one might have the ability to accurately forecast the availability of wind power, it might not be available during enough of the peak period to provide sufficient value. However, if the wind power plant is developed over geographically disperse locations, the timing and availability of wind power from these multiple sources could provide a better match with the utility`s peak load than a single site. There are several wind plants in various stages of planning or development in the US. Although some of these are small-scale demonstration projects, significant wind capacity has been developed in Minnesota, with additional developments planned in Wyoming and Iowa. As these and other projects are planned and developed, there is a need to perform analysis of the value of geographically diverse sites on the efficiency of the overall wind plant. In this paper, the authors use hourly wind-speed data from six geographically diverse sites to provide some insight into the potential benefits of disperse wind plant development. They provide hourly wind power from each of these sites to an electric reliability simulation model. This model uses generating plant characteristics of the generators within the state of Minnesota to calculate various reliability indices. Since they lack data on wholesale power transactions, they do not include them in the analysis, and they reduce the hourly load data accordingly. The authors present and compare results of their methods and suggest some areas of future research.

  2. Stochastic Ordering of Interferences in Large-scale Wireless Networks

    E-Print Network [OSTI]

    Lee, Junghoon

    2012-01-01

    Stochastic orders are binary relations defined on probability distributions which capture intuitive notions like being larger or being more variable. This paper introduces stochastic ordering of interference distributions in large-scale networks modeled as point process. Interference is the main performance-limiting factor in most wireless networks, thus it is important to understand its statistics. Since closed-form results for the distribution of interference for such networks are only available in limited cases, interference of networks are compared using stochastic orders, even when closed form expressions for interferences are not tractable. We show that the interference from a large-scale network depends on the fading distributions with respect to the stochastic Laplace transform order. The condition for path-loss models is also established to have stochastic ordering between interferences. The stochastic ordering of interferences between different networks are also shown. Monte-Carlo simulations are us...

  3. Large-scale flow generation by inhomogeneous helicity

    E-Print Network [OSTI]

    Yokoi, Nobumitsu

    2015-01-01

    The effect of kinetic helicity (velocity--vorticity correlation) on turbulent momentum transport is investigated. The turbulent kinetic helicity (pseudoscalar) enters into the Reynolds stress (mirrorsymmetric tensor) expression in the form of a helicity gradient as the coupling coefficient for the mean vorticity and/or the angular velocity (axial vector), which suggests the possibility of mean-flow generation in the presence of inhomogeneous helicity. This inhomogeneous helicity effect, which was previously confirmed at the level of a turbulence- or closure-model simulation, is examined with the aid of direct numerical simulations of rotating turbulence with non-uniform helicity sustained by an external forcing. The numerical simulations show that the spatial distribution of the Reynolds stress is in agreement with the helicity-related term coupled with the angular velocity, and that a large-scale flow is generated in the direction of angular velocity. Such a large-scale flow is not induced in the case of hom...

  4. Simulating the Large-Scale Structure of HI Intensity Maps

    E-Print Network [OSTI]

    Seehars, Sebastian; Witzemann, Amadeus; Refregier, Alexandre; Amara, Adam; Akeret, Joel

    2015-01-01

    Intensity mapping of neutral hydrogen (HI) is a promising observational probe of cosmology and large-scale structure. We present wide field simulations of HI intensity maps based on N-body simulations, the halo model, and a phenomenological prescription for assigning HI mass to halos. The simulations span a redshift range of 0.35 HI. We apply and compare several estimators for the angular power spectrum and its covariance. We verify that they agree with analytic predictions on large scales and study the validity of approximations based on Gaussian random fields, particularly in the context of the covariance. We discuss how our results and the simulated maps can be useful for planning and interpreting future HI intensity mapping surveys.

  5. Clusters and Large-Scale Structure: the Synchrotron Keys

    E-Print Network [OSTI]

    Rudnick, L; Andernach, H; Battaglia, N; Brown, S; Brunetti, Gf; Burns, J; Clarke, T; Dolag, K; Farnsworth, D; Giovannini, G; Hallman, E; Johnston-Hollit, M; Jones, T W; Kang, H; Kassim, N; Kravtsov, A; Lazio, J; Lonsdale, C; McNamara, B; Myers, S; Owen, F; Pfrommer, C; Ryu, D; Sarazin, C; Subrahmanyan, R; Taylor, G; Taylor, R

    2009-01-01

    For over four decades, synchrotron-radiating sources have played a series of pathfinding roles in the study of galaxy clusters and large scale structure. Such sources are uniquely sensitive to the turbulence and shock structures of large-scale environments, and their cosmic rays and magnetic fields often play important dynamic and thermodynamic roles. They provide essential complements to studies at other wavebands. Over the next decade, they will fill essential gaps in both cluster astrophysics and the cosmological growth of structure in the universe, especially where the signatures of shocks and turbulence, or even the underlying thermal plasma itself, are otherwise undetectable. Simultaneously, synchrotron studies offer a unique tool for exploring the fundamental question of the origins of cosmic magnetic fields. This work will be based on the new generation of m/cm-wave radio telescopes now in construction, as well as major advances in the sophistication of 3-D MHD simulations.

  6. Wind Power: How Much, How Soon, and At What Cost?

    E-Print Network [OSTI]

    Wiser, Ryan H

    2010-01-01

    Evaluation of Global Wind Power." Journal of Geophysical2008. "The Economics of Wind Power with Energy Storage."Economics of Large-Scale Wind Power in a Carbon Constrained

  7. Dynamic analysis of a 5 megawatt offshore floating wind turbine

    E-Print Network [OSTI]

    Harriger, Evan Michael

    2011-01-01

    TU Delft and Siemens Wind Power, 2009. 7. Crossett, KristenRan. Large-Scale Offshore Wind Power in the United States:In fact, each GW of clean wind power eliminates 1.8 million

  8. Fully coupled dynamic analysis of a floating wind turbine system

    E-Print Network [OSTI]

    Withee, Jon E

    2004-01-01

    The use of wind power is in a period of rapid growth worldwide and wind energy systems have emerged as a promising technology for utilizing offshore wind resources for the large scale generation of electricity. Drawing ...

  9. SMALL-SCALE VARIABILITY IN SEA SURFACE HEIGHTS AND SURFACE WINDS: IMPLICATIONS FOR ERRORS IN OCEAN MODELS AND OBSERVATIONS

    E-Print Network [OSTI]

    Kaplan, Alexey

    SMALL-SCALE VARIABILITY IN SEA SURFACE HEIGHTS AND SURFACE WINDS: IMPLICATIONS FOR ERRORS IN OCEAN on dispersion relationship of planetary waves 4. Small-scale variability in surface winds and sea surface of model and observational data sets. Imperfect parameterization of the small-scale variability (SSV

  10. Buoyancy Effects on the Scaling Characteristics of Atmospheric Boundary Layer Wind Fields in the Mesoscale Range

    E-Print Network [OSTI]

    Kiliyanpilakkil, V P; Ruiz-Columbié, A; Araya, G; Castillo, L; Hirth, B; Burgett, W

    2015-01-01

    We have analyzed long-term wind speed time-series from five field sites up to a height of 300 m from the ground. Structure function-based scaling analysis has revealed that the scaling exponents in the mesoscale regime systematically depend on height. This anomalous behavior is shown to be caused by the buoyancy effects. In the framework of the extended self-similarity, the relative scaling exponents portray quasi-universal behavior.

  11. Electrochemical cells for medium- and large-scale energy storage

    SciTech Connect (OSTI)

    Wang, Wei; Wei, Xiaoliang; Choi, Daiwon; Lu, Xiaochuan; Yang, G.; Sun, C.

    2014-12-12

    This is one of the chapters in the book titled “Advances in batteries for large- and medium-scale energy storage: Applications in power systems and electric vehicles” that will be published by the Woodhead Publishing Limited. The chapter discusses the basic electrochemical fundamentals of electrochemical energy storage devices with a focus on the rechargeable batteries. Several practical secondary battery systems are also discussed as examples

  12. Greening the Networks of Large-Scale Distributed Systems

    E-Print Network [OSTI]

    Lefèvre, Laurent

    -tier fat-tree architecture Energy savings of Green compared to No off : - 73% for a 20% workload - 68Greening the Networks of Large-Scale Distributed Systems ENS de Lyon ­ INRIA RESO ­ UCBL ­ LIP://perso.ens-lyon.fr/annececile.orgerie/networks.html HERMES : High-level Energy-awaRe Model for bandwidth reservation in End-to-end NetworkS · Unused network

  13. Large CO2 reductions via offshore wind power matched to inherent storage in energy end-uses

    E-Print Network [OSTI]

    Large CO2 reductions via offshore wind power matched to inherent storage in energy end-uses Willett develop methods for assessing offshore wind resources, using a model of the vertical structure offshore wind power matched to inherent storage in energy end- uses, Geophys. Res. Lett., 34, L02817, doi

  14. Abstract--A large share of integrated wind power causes technical and financial impacts on the operation of the existing

    E-Print Network [OSTI]

    1 Abstract-- A large share of integrated wind power causes technical and financial impacts on the operation of the existing electricity system due to the fluctuating behaviour and unpredictability of wind behaviour of the wind power generation and of the prediction error. It can be used for the evaluation

  15. 2 Large CO2 reductions via offshore wind power matched to inherent 3 storage in energy end-uses

    E-Print Network [OSTI]

    Firestone, Jeremy

    2 Large CO2 reductions via offshore wind power matched to inherent 3 storage in energy end-uses 4 by matching the winds of the 14 Middle-Atlantic Bight (MAB) to energy demand in the 15 adjacent states] We develop methods for assessing offshore wind 9 resources, using a model of the vertical structure

  16. Large scale structure simulations of inhomogeneous LTB void models

    E-Print Network [OSTI]

    David Alonso; Juan Garcia-Bellido; Troels Haugboelle; Julian Vicente

    2011-01-11

    We perform numerical simulations of large scale structure evolution in an inhomogeneous Lemaitre-Tolman-Bondi (LTB) model of the Universe. We follow the gravitational collapse of a large underdense region (a void) in an otherwise flat matter-dominated Einstein-deSitter model. We observe how the (background) density contrast at the centre of the void grows to be of order one, and show that the density and velocity profiles follow the exact non-linear LTB solution to the full Einstein equations for all but the most extreme voids. This result seems to contradict previous claims that fully relativistic codes are needed to properly handle the non-linear evolution of large scale structures, and that local Newtonian dynamics with an explicit expansion term is not adequate. We also find that the (local) matter density contrast grows with the scale factor in a way analogous to that of an open universe with a value of the matter density OmegaM(r) corresponding to the appropriate location within the void.

  17. Large scale CMB anomalies from thawing cosmic strings

    E-Print Network [OSTI]

    Christophe Ringeval; Daisuke Yamauchi; Jun'ichi Yokoyama; Francois R. Bouchet

    2015-10-07

    Cosmic strings formed during inflation are expected to be either diluted over super-Hubble distances, i.e., invisible today, or to have crossed our past light cone very recently. We discuss the latter situation in which a few strings imprint their signature in the Cosmic Microwave Background (CMB) Anisotropies after recombination. Being almost frozen in the Hubble flow, these strings are quasi static and evade almost all of the previously derived constraints on their tension while being able to source large scale anisotropies in the CMB sky. Using a local variance estimator on thousand of numerically simulated Nambu-Goto all sky maps, we compute the expected signal and show that it can mimic a dipole modulation at large angular scales while being negligible at small angles. Interestingly, such a scenario generically produces one cold spot from the thawing of a cosmic string loop. Mixed with anisotropies of inflationary origin, we find that a few strings of tension GU = O(1) x 10^(-6) match the amplitude of the dipole modulation reported in the Planck satellite measurements and could be at the origin of other large scale anomalies.

  18. Aalborg Universitet Methodologies for Wind Turbine and STATCOM Integration in Wind Power Plant

    E-Print Network [OSTI]

    Bak, Claus Leth

    Aalborg Universitet Methodologies for Wind Turbine and STATCOM Integration in Wind Power Plant Integration in Wind Power Plant Models for Harmonic Resonances Assessment. In Proceedings of the 14th Wind Integration Workshop: International Workshop on Large-Scale Integration of Wind Power into Power Systems

  19. Analysis of the Technical and Economic Potential for Mid-Scale Distributed Wind: December 2007 - October 31, 2008

    SciTech Connect (OSTI)

    Kwartin, R.; Wolfrum, A.; Granfield, K.; Kagel, A.; Appleton, A.

    2008-12-01

    This report examines the status, restrainers, drivers, and estimated development potential of mid-scale (10 kW - 5000 kW) distributed wind energy projects.

  20. Nuclear-pumped lasers for large-scale applications

    SciTech Connect (OSTI)

    Anderson, R.E.; Leonard, E.M.; Shea, R.F.; Berggren, R.R.

    1989-05-01

    Efficient initiation of large-volume chemical lasers may be achieved by neutron induced reactions which produce charged particles in the final state. When a burst mode nuclear reactor is used as the neutron source, both a sufficiently intense neutron flux and a sufficiently short initiation pulse may be possible. Proof-of-principle experiments are planned to demonstrate lasing in a direct nuclear-pumped large-volume system; to study the effects of various neutron absorbing materials on laser performance; to study the effects of long initiation pulse lengths; to demonstrate the performance of large-scale optics and the beam quality that may be obtained; and to assess the performance of alternative designs of burst systems that increase the neutron output and burst repetition rate. 21 refs., 8 figs., 5 tabs.

  1. Nuclear-pumped lasers for large-scale applications

    SciTech Connect (OSTI)

    Anderson, R.E.; Leonard, E.M.; Shea, R.E.; Berggren, R.R.

    1988-01-01

    Efficient initiation of large-volume chemical lasers may be achieved by neutron induced reactions which produce charged particles in the final state. When a burst mode nuclear reactor is used as the neutron source, both a sufficiently intense neutron flux and a sufficient short initiation pulse may be possible. Proof-of-principle experiments are planned to demonstrate lasing in a direct nuclear-pumped large-volume system: to study the effects of various neutron absorbing materials on laser performance; to study the effects of long initiation pulse lengths; to determine the performance of large-scale optics and the beam quality that may bo obtained; and to assess the performance of alternative designs of burst systems that increase the neutron output and burst repetition rate. 21 refs., 7 figs., 5 tabs.

  2. The use of real-time off-site observations as a methodology for increasing forecast skill in prediction of large wind power ramps one or more hours ahead of their impact on a wind plant.

    SciTech Connect (OSTI)

    Martin Wilde, Principal Investigator

    2012-12-31

    ABSTRACT Application of Real-Time Offsite Measurements in Improved Short-Term Wind Ramp Prediction Skill Improved forecasting performance immediately preceding wind ramp events is of preeminent concern to most wind energy companies, system operators, and balancing authorities. The value of near real-time hub height-level wind data and more general meteorological measurements to short-term wind power forecasting is well understood. For some sites, access to onsite measured wind data - even historical - can reduce forecast error in the short-range to medium-range horizons by as much as 50%. Unfortunately, valuable free-stream wind measurements at tall tower are not typically available at most wind plants, thereby forcing wind forecasters to rely upon wind measurements below hub height and/or turbine nacelle anemometry. Free-stream measurements can be appropriately scaled to hub-height levels, using existing empirically-derived relationships that account for surface roughness and turbulence. But there is large uncertainty in these relationships for a given time of day and state of the boundary layer. Alternatively, forecasts can rely entirely on turbine anemometry measurements, though such measurements are themselves subject to wake effects that are not stationary. The void in free-stream hub-height level measurements of wind can be filled by remote sensing (e.g., sodar, lidar, and radar). However, the expense of such equipment may not be sustainable. There is a growing market for traditional anemometry on tall tower networks, maintained by third parties to the forecasting process (i.e., independent of forecasters and the forecast users). This study examines the value of offsite tall-tower data from the WINDataNOW Technology network for short-horizon wind power predictions at a wind farm in northern Montana. The presentation shall describe successful physical and statistical techniques for its application and the practicality of its application in an operational setting. It shall be demonstrated that when used properly, the real-time offsite measurements materially improve wind ramp capture and prediction statistics, when compared to traditional wind forecasting techniques and to a simple persistence model.

  3. Coherent dynamics in the rotor tip shear layer of utility scale wind turbines

    E-Print Network [OSTI]

    Yang, Xiaolei; Barone, Matthew; Sotiropoulos, Fotis

    2015-01-01

    Recent field experiments conducted in the near-wake (up to 0.5 rotor diameters downwind of the rotor) of a 2.5 MW wind turbine using snow-based super-large-scale particle image velocimetery (SLPIV) (Hong et al., Nature Comm., vol. 5, 2014, no. 4216) were successful in visualizing tip vortex cores as areas devoid of snowflakes. The so-visualized snow voids, however, suggested tip vortex cores of complex shape consisting of circular cores with distinct elongated comet-like tails. We employ large-eddy simulation (LES) to elucidate the structure and dynamics of the complex tip vortices identified experimentally. The LES is shown to reproduce vortex cores in good qualitative agreement with the SLPIV results, essentially capturing all vortex core patterns observed in the field in the tip shear layer. We show that the visualized vortex patterns are the result of energetic coherent dynamics in the rotor tip shear layer driven by interactions between the tip vortices and a second set of counter-rotating spiral vortice...

  4. A concurrent precursor inflow method for Large Eddy Simulations and applications to finite length wind farms

    E-Print Network [OSTI]

    Stevens, Richard J A M; Meneveau, Charles

    2014-01-01

    In order to enable simulations of developing wind turbine array boundary layers with highly realistic inflow conditions a concurrent precursor method for Large Eddy Simulations is proposed. In this method we consider two domains simultaneously, i.e. in one domain a turbulent Atmospheric Boundary Layer (ABL) without wind turbines is simulated in order to generate the turbulent inflow conditions for a second domain in which the wind turbines are placed. The benefit of this approach is that a) it avoids the need for large databases in which the turbulent inflow conditions are stored and the correspondingly slow I/O operations and b) we are sure that the simulations are not negatively affected by statically swept fixed inflow fields or synthetic fields lacking the proper ABL coherent structures. Sample applications are presented, in which, in agreement with field data a strong decrease of the power output of downstream wind-turbines with respect to the first row of wind-turbines is observed for perfectly aligned ...

  5. Just enough inflation: power spectrum modifications at large scales

    SciTech Connect (OSTI)

    Cicoli, Michele [Dipartimento di Fisica ed Astronomia, Università di Bologna, via Irnerio 46, 40126 Bologna (Italy); Downes, Sean [Leung Center for Cosmology and Particle Astrophysics, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan (China); Dutta, Bhaskar [Mitchell Institute for Fundamental Physics and Astronomy, Department of Physics and Astronomy, Texas A and M University, College Station, TX 77843-4242 (United States); Pedro, Francisco G.; Westphal, Alexander, E-mail: mcicoli@ictp.it, E-mail: ssdownes@phys.ntu.edu.tw, E-mail: dutta@physics.tamu.edu, E-mail: francisco.pedro@desy.de, E-mail: alexander.westphal@desy.de [Deutsches Elektronen-Synchrotron DESY, Theory Group, D-22603 Hamburg (Germany)

    2014-12-01

    We show that models of 'just enough' inflation, where the slow-roll evolution lasted only 50- 60 e-foldings, feature modifications of the CMB power spectrum at large angular scales. We perform a systematic analytic analysis in the limit of a sudden transition between any possible non-slow-roll background evolution and the final stage of slow-roll inflation. We find a high degree of universality since most common backgrounds like fast-roll evolution, matter or radiation-dominance give rise to a power loss at large angular scales and a peak together with an oscillatory behaviour at scales around the value of the Hubble parameter at the beginning of slow-roll inflation. Depending on the value of the equation of state parameter, different pre-inflationary epochs lead instead to an enhancement of power at low ?, and so seem disfavoured by recent observational hints for a lack of CMB power at ??< 40. We also comment on the importance of initial conditions and the possibility to have multiple pre-inflationary stages.

  6. Large scale structures in gas-liquid mixture flows

    SciTech Connect (OSTI)

    Davis, M.R.; Fungtamasan, B.

    1984-12-01

    Relatively slow variations in mixture void fraction in gas-liquid mixture flows are indicated by low pass filter averaging. The slow void fluctuations are found to have a regular characteristic frequency or scale in the churn flow regime or near the boundary with the dispersed bubble flow regime. These regular disturbances develop inherently in a vertical pipe flow in strength and in size and are not due to the method of flow mixing. There was no evidence of distinctive gas slugs in the flow, and the structures were identified as large clouds of bubbles which moved faster than the average velocity, growing in size and strength as they moved with the flow. The magnitude of the voidage fluctuations in the churn flow regime was on average 57% of the value for a slug flow. The large scale bubble clouds convect coherently over relatively long distances a up to 1.45 times the mean mixture flow velocity at a gas volume flow fraction of 0.4. In the bubbl flow regime, the slow voidage variations were more random in scale and were only approx. 10% of the slug flow (maximum possible) value. However, even in the bubble flow regime, the disturbances convected coherently over relatively long distances at a velocity of approx. 1.1 time the mean mixture velocity.

  7. NREL's Wind R&D Success Stories, National Wind Technology Center (NWTC) (Fact Sheet)

    SciTech Connect (OSTI)

    Not Available

    2010-01-01

    Wind energy research, development, and deployment have reduced the cost of large and small wind turbine technologies, increased wind energy system reliability and operability, lowered risk by validating performance and design, increased the understanding of the true impacts of wind energy on the U.S. electrical infrastructure, and expanded wind energy markets. A synopsis of research conducted on utility-scale wind turbines, small wind turbines, software, components, market development and grid integration are detailed.

  8. A Minnesota Blizzard Provides Insight into Utility-Scale Wind...

    Office of Environmental Management (EM)

    the researchers were ready. They had positioned a large searchlight with reflecting optics designed to create a light sheet reflecting off snow particles in an area that was 36...

  9. Wind speed forecasting at different time scales: a non parametric approach

    E-Print Network [OSTI]

    D'Amico, Guglielmo; Prattico, Flavio

    2013-01-01

    The prediction of wind speed is one of the most important aspects when dealing with renewable energy. In this paper we show a new nonparametric model, based on semi-Markov chains, to predict wind speed. Particularly we use an indexed semi-Markov model, that reproduces accurately the statistical behavior of wind speed, to forecast wind speed one step ahead for different time scales and for very long time horizon maintaining the goodness of prediction. In order to check the main features of the model we show, as indicator of goodness, the root mean square error between real data and predicted ones and we compare our forecasting results with those of a persistence model.

  10. Robust Morphological Measures for Large-Scale Structure

    E-Print Network [OSTI]

    T. Buchert

    1994-12-17

    A complete family of statistical descriptors for the morphology of large--scale structure based on Minkowski--Functionals is presented. These robust and significant measures can be used to characterize the local and global morphology of spatial patterns formed by a coverage of point sets which represent galaxy samples. Basic properties of these measures are highlighted and their relation to the `genus statistics' is discussed. Test models like a Poissonian point process and samples generated from a Voronoi--model are put into perspective.

  11. Large scale obscuration and related climate effects open literature bibliography

    SciTech Connect (OSTI)

    Russell, N.A.; Geitgey, J.; Behl, Y.K.; Zak, B.D.

    1994-05-01

    Large scale obscuration and related climate effects of nuclear detonations first became a matter of concern in connection with the so-called ``Nuclear Winter Controversy`` in the early 1980`s. Since then, the world has changed. Nevertheless, concern remains about the atmospheric effects of nuclear detonations, but the source of concern has shifted. Now it focuses less on global, and more on regional effects and their resulting impacts on the performance of electro-optical and other defense-related systems. This bibliography reflects the modified interest.

  12. Large-Scale Anisotropy of EGRET Gamma Ray Sources

    E-Print Network [OSTI]

    Luis Anchordoqui; Thomas McCauley; Thomas Paul; Olaf Reimer; Diego F. Torres

    2005-06-24

    In the course of its operation, the EGRET experiment detected high-energy gamma ray sources at energies above 100 MeV over the whole sky. In this communication, we search for large-scale anisotropy patterns among the catalogued EGRET sources using an expansion in spherical harmonics, accounting for EGRET's highly non-uniform exposure. We find significant excess in the quadrupole and octopole moments. This is consistent with the hypothesis that, in addition to the galactic plane, a second mid-latitude (5^{\\circ} < |b| < 30^{\\circ}) population, perhaps associated with the Gould belt, contributes to the gamma ray flux above 100 MeV.

  13. Future large-scale water-Cherenkov detector

    E-Print Network [OSTI]

    L. Agostino; M. Buizza-Avanzini; M. Marafini; T. Patzak; A. Tonazzo; M. Dracos; N. Vassilopoulos; D. Duchesneau; M. Mezzetto; L. Mosca

    2013-06-28

    MEMPHYS (MEgaton Mass PHYSics) is a proposed large-scale water-Cherenkov experiment to be performed deep underground. It is dedicated to nucleon decay searches and the detection of neutrinos from supernovae, solar, and atmospheric neutrinos, as well as neutrinos from a future beam to measure the CP violating phase in the leptonic sector and the mass hierarchy. This paper provides an overview of the latest studies on the expected performance of MEMPHYS in view of detailed estimates of its physics reach, mainly concerning neutrino beams.

  14. Streamflow forecasting for large-scale hydrologic systems 

    E-Print Network [OSTI]

    Awwad, Haitham Munir

    1991-01-01

    Farland (Member) J esTR ao (Head of Department) May 1991 ABSTRACT Streamflow Forecasting for Large-Scale Hydrologic Systems. (May 1991) Haitham Munir Awwad, B. S. , University of Jordan Chair of Advisory Committee: Dr. Juan B. Valdes An on-line streamflow... thankful to Dr. Ralph A. Wurbs and Dr. Marshall J. McFarland for their assistance on my advisory committee. Support for this thesis by the Department of Civil Engineering through the Engineering Excellence Fund, and by the U, S. Army Corps of Engineers...

  15. Large Scale GSHP as Alternative Energy for American Farmers Geothermal

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QAsource History View NewTexas:Montezuma, Arizona: Energy ResourcesProject | Open Energy Information Large Scale

  16. Large-Scale Spray Releases: Additional Aerosol Test Results

    SciTech Connect (OSTI)

    Daniel, Richard C.; Gauglitz, Phillip A.; Burns, Carolyn A.; Fountain, Matthew S.; Shimskey, Rick W.; Billing, Justin M.; Bontha, Jagannadha R.; Kurath, Dean E.; Jenks, Jeromy WJ; MacFarlan, Paul J.; Mahoney, Lenna A.

    2013-08-01

    One of the events postulated in the hazard analysis for the Waste Treatment and Immobilization Plant (WTP) and other U.S. Department of Energy (DOE) nuclear facilities is a breach in process piping that produces aerosols with droplet sizes in the respirable range. The current approach for predicting the size and concentration of aerosols produced in a spray leak event involves extrapolating from correlations reported in the literature. These correlations are based on results obtained from small engineered spray nozzles using pure liquids that behave as a Newtonian fluid. The narrow ranges of physical properties on which the correlations are based do not cover the wide range of slurries and viscous materials that will be processed in the WTP and in processing facilities across the DOE complex. To expand the data set upon which the WTP accident and safety analyses were based, an aerosol spray leak testing program was conducted by Pacific Northwest National Laboratory (PNNL). PNNL’s test program addressed two key technical areas to improve the WTP methodology (Larson and Allen 2010). The first technical area was to quantify the role of slurry particles in small breaches where slurry particles may plug the hole and prevent high-pressure sprays. The results from an effort to address this first technical area can be found in Mahoney et al. (2012a). The second technical area was to determine aerosol droplet size distribution and total droplet volume from prototypic breaches and fluids, including sprays from larger breaches and sprays of slurries for which literature data are mostly absent. To address the second technical area, the testing program collected aerosol generation data at two scales, commonly referred to as small-scale and large-scale testing. The small-scale testing and resultant data are described in Mahoney et al. (2012b), and the large-scale testing and resultant data are presented in Schonewill et al. (2012). In tests at both scales, simulants were used to mimic the relevant physical properties projected for actual WTP process streams.

  17. Planning under uncertainty solving large-scale stochastic linear programs

    SciTech Connect (OSTI)

    Infanger, G. . Dept. of Operations Research Technische Univ., Vienna . Inst. fuer Energiewirtschaft)

    1992-12-01

    For many practical problems, solutions obtained from deterministic models are unsatisfactory because they fail to hedge against certain contingencies that may occur in the future. Stochastic models address this shortcoming, but up to recently seemed to be intractable due to their size. Recent advances both in solution algorithms and in computer technology now allow us to solve important and general classes of practical stochastic problems. We show how large-scale stochastic linear programs can be efficiently solved by combining classical decomposition and Monte Carlo (importance) sampling techniques. We discuss the methodology for solving two-stage stochastic linear programs with recourse, present numerical results of large problems with numerous stochastic parameters, show how to efficiently implement the methodology on a parallel multi-computer and derive the theory for solving a general class of multi-stage problems with dependency of the stochastic parameters within a stage and between different stages.

  18. Large Scale Renewable Energy Property Tax Abatement (Nevada State...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    renewable energy resources including solar, wind, biomass*, fuel cells, geothermal or hydro. Generation facilities must have a capacity of at least 10 megawatts (MW). Facilities...

  19. PATHWAYS OF LARGE-SCALE MAGNETIC COUPLINGS BETWEEN SOLAR CORONAL...

    Office of Scientific and Technical Information (OSTI)

    the connections from the solar surface into the heliosphere to properly model the solar wind, its perturbations, and the generation and propagation of solar energetic particles....

  20. Small-scale anisotropy and intermittency in high and low-latitude solar wind

    E-Print Network [OSTI]

    A. Bigazzi; L. Biferale; S. M. A. Gama; M. Velli

    2004-12-14

    We analyze low and high--latitude fast solar wind data from the Ulysses spacecraft from 1992 to 1994 using a a systematic method to analyse the anisotropic content of the magnetic field fluctuations. We investigate all available frequencies, 1-10^{-6} Hz, for both high and low--latitudes datasets and are able to quantify the relative importance of the anisotropic versus the isotropic fluctuations. We analyse, up to sixth order, longitudinal, transverse and mixed magnetic field correlations. Our results show that strongly intermittent and anisotropic events are present in the solar wind plasma at high frequencies/small scales, indicating the absence of a complete recovery of isotropy. Anisotropic scaling properties are compatible for high and low--latitude data, suggesting a universal behaviour in spite of the different rate of evolution of the fast solar wind streams in the two environments.

  1. Large scale CMB anomalies from thawing cosmic strings

    E-Print Network [OSTI]

    Ringeval, Christophe; Yokoyama, Jun'ichi; Bouchet, Francois R

    2015-01-01

    Cosmic strings formed during inflation are expected to be either diluted over super-Hubble distances, i.e., invisible today, or to have crossed our past light cone very recently. We discuss the latter situation in which a few strings imprint their signature in the Cosmic Microwave Background (CMB) Anisotropies after recombination. Being almost frozen in the Hubble flow, these strings are quasi static and evade almost all of the previously derived constraints on their tension while being able to source large scale anisotropies in the CMB sky. Using a local variance estimator on thousand of numerically simulated Nambu-Goto all sky maps, we compute the expected signal and show that it can mimic a dipole modulation at large angular scales while being negligible at small angles. Interestingly, such a scenario generically produces one cold spot from the thawing of a cosmic string loop. Mixed with anisotropies of inflationary origin, we find that a few strings of tension GU = O(1) x 10^(-6) match the amplitude of th...

  2. Radiating instability and small-scale stochastic wind J. WANG, M. A. SPALL, J. PEDLOSKY AND I. KAMENKOVICH

    E-Print Network [OSTI]

    Griesel, Alexa

    1 Radiating instability and small-scale stochastic wind forcing J. WANG, M. A. SPALL, J. PEDLOSKY AND I. KAMENKOVICH Radiating instability and small-scale stochastic wind forcing Unlike of this book, to the generation of the quasi-zonal jets in the ocean. One interesting phenomenon

  3. Using Mesoscale Weather Model Output as Boundary Conditions for Atmospheric Large-Eddy Simulations and Wind-Plant Aerodynamic Simulations (Presentation)

    SciTech Connect (OSTI)

    Churchfield, M. J.; Michalakes, J.; Vanderwende, B.; Lee, S.; Sprague, M. A.; Lundquist, J. K.; Moriarty, P. J.

    2013-10-01

    Wind plant aerodynamics are directly affected by the microscale weather, which is directly influenced by the mesoscale weather. Microscale weather refers to processes that occur within the atmospheric boundary layer with the largest scales being a few hundred meters to a few kilometers depending on the atmospheric stability of the boundary layer. Mesoscale weather refers to large weather patterns, such as weather fronts, with the largest scales being hundreds of kilometers wide. Sometimes microscale simulations that capture mesoscale-driven variations (changes in wind speed and direction over time or across the spatial extent of a wind plant) are important in wind plant analysis. In this paper, we present our preliminary work in coupling a mesoscale weather model with a microscale atmospheric large-eddy simulation model. The coupling is one-way beginning with the weather model and ending with a computational fluid dynamics solver using the weather model in coarse large-eddy simulation mode as an intermediary. We simulate one hour of daytime moderately convective microscale development driven by the mesoscale data, which are applied as initial and boundary conditions to the microscale domain, at a site in Iowa. We analyze the time and distance necessary for the smallest resolvable microscales to develop.

  4. Large scale steam valve test: Performance testing of large butterfly valves and full scale high flowrate steam testing

    SciTech Connect (OSTI)

    Meadows, J.B.; Robbins, G.E.; Roselius, D.G. [and others

    1995-05-01

    This report presents the results of the design testing of large (36-inch diameter) butterfly valves under high flow conditions. The two butterfly valves were pneumatically operated air-open, air-shut valves (termed valves 1 and 2). These butterfly valves were redesigned to improve their ability to function under high flow conditions. Concern was raised regarding the ability of the butterfly valves to function as required with high flow-induced torque imposed on the valve discs during high steam flow conditions. High flow testing was required to address the flow-induced torque concerns. The valve testing was done using a heavily instrumented piping system. This test program was called the Large Scale Steam Valve Test (LSSVT). The LSSVT program demonstrated that the redesigned valves operated satisfactorily under high flow conditions.

  5. The Origin of Large-scale HI structures in the Magellanic Bridge

    E-Print Network [OSTI]

    E. Muller; K. Bekki

    2007-06-27

    We investigate the formation of a number of key large-scale HI features in the ISM of the Magellanic Bridge using dissipationless numerical simulation techniques. This study comprises the first direct comparison between detailed HI maps of the Bridge and numerical simulations. We confirm that the SMC forms two tidal filaments: a near arm, which forms the connection between the SMC and LMC, and a counterarm. We show that the HI of the most dense part of the Bridge can become arranged into a bimodal configuration, and that the formation of a "loop" of HI, located off the North-Eastern edge of the SMC can be reproduced simply as a projection of the counter-arm, and without invoking localised energy-deposition processes such as SNe or stellar winds.

  6. Large-scale jets in the magnetosheath and plasma penetration across the magnetopause: THEMIS observations

    E-Print Network [OSTI]

    Dmitriev, A V

    2015-01-01

    THEMIS multi-point observation of the plasma and magnetic fields, conducted simultaneously in the dayside magnetosheath and magnetosphere, were used to collect 646 large-scale magnetosheath plasma jets interacting with the magnetopause. The jets were identified as dense and fast streams of the magnetosheath plasma whose energy density is higher than that of the upstream solar wind. The jet interaction with the magnetopause was revealed from sudden inward motion of the magnetopause and an enhancement in the geomagnetic field. The penetration was determined as appearance of the magnetosheath plasma against the background of the hot magnetospheric particle population. We found that almost 60% of the jets penetrated through the magnetopause. Vast majority of the penetrating jets was characterized by high velocities V > 220 km/s and kinetic bk > 1 that corresponded to a combination of finite Larmor radius effect with a mechanisms of impulsive penetration. The average plasma flux in the penetrating jets was found t...

  7. Large-scale chromosome fluctuations are driven by chromatin folding organization at small scales

    E-Print Network [OSTI]

    Ana Maria Florescu; Pierre Therizols; Angelo Rosa

    2015-11-18

    Characterizing the link between small-scale chromatin structure and large-scale chromosome conformation is a prerequisite for understanding transcription. Yet, it remains poorly characterized. We present a simple biophysical model, where chromosomes are described in terms of folding of a chromatin sequence with alternating blocks of fibers with different thickness. We demonstrate that chromosomes undergo prominent conformational changes when the two fibers form separate domains. Conversely, when small stretches of the thinner fiber are randomly distributed, they act as impurities and conformational changes can be observed only at small length and time scales. Our results bring a limit to the possibility of detecting variations in the behavior of chromosomes due to chromatin modifications, and suggest that the debate whether chromosomes expand upon transcription, which is fueled by conflicting experimental observations, can be reconciled by examining how transcribed loci are distributed. Finally, to validate our conclusions, we compare our results to experimental FISH data.

  8. The XMM/Megacam-VST/VIRMOS Large Scale Structure Survey

    E-Print Network [OSTI]

    M. Pierre

    2000-11-08

    The objective of the XMM-LSS Survey is to map the large scale structure of the universe, as highlighted by clusters and groups of galaxies, out to a redshift of about 1, over a single 8x8 sq.deg. area. For the first time, this will reveal the topology of the distribution of the deep potential wells and provide statistical measurements at truly cosmological distances. In addition, clusters identified via their X-ray properties will form the basis for the first uniformly-selected, multi-wavelength survey of the evolution of clusters and individual cluster galaxies as a function of redshift. The survey will also address the very important question of the QSO distribution within the cosmic web.

  9. Unfolding large-scale online collaborative human dynamics

    E-Print Network [OSTI]

    Zha, Yilong; Zhou, Changsong

    2015-01-01

    Large-scale interacting human activities underlie all social and economic phenomena, but quantitative understanding of regular patterns and mechanism is very challenging and still rare. Self-organized online collaborative activities with precise record of event timing provide unprecedented opportunity. Our empirical analysis of the history of millions of updates in Wikipedia shows a universal double power-law distribution of time intervals between consecutive updates of an article. We then propose a generic model to unfold collaborative human activities into three modules: (i) individual behavior characterized by Poissonian initiation of an action, (ii) human interaction captured by a cascading response to others with a power-law waiting time, and (iii) population growth due to increasing number of interacting individuals. This unfolding allows us to obtain analytical formula that is fully supported by the universal patterns in empirical data. Our modeling approaches reveal "simplicity" beyond complex interac...

  10. CONSTRAINING PRIMORDIAL MAGNETIC FIELDS THROUGH LARGE-SCALE STRUCTURE

    SciTech Connect (OSTI)

    Kahniashvili, Tina; Natarajan, Aravind; Battaglia, Nicholas [McWilliams Center for Cosmology and Department of Physics, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, PA 15213 (United States); Maravin, Yurii [Department of Physics, Kansas State University, 116 Cardwell Hall, Manhattan, KS 66506 (United States); Tevzadze, Alexander G., E-mail: tinatin@andrew.cmu.edu [Faculty of Exact and Natural Sciences, Javakhishvili Tbilisi State University, 3 Chavchavadze Avenue, Tbilisi 0128 (Georgia)

    2013-06-10

    We study primordial magnetic field effects on the matter perturbations in the universe. We assume magnetic field generation prior to the big bang nucleosynthesis (BBN), i.e., during the radiation-dominated epoch of the universe expansion, but do not limit analysis by considering a particular magnetogenesis scenario. Contrary to previous studies, we limit the total magnetic field energy density and not the smoothed amplitude of the magnetic field at large (of the order of 1 Mpc) scales. We review several cosmological signatures, such as halo abundance, thermal Sunyaev-Zel'dovich effect, and Ly{alpha} data. For a cross-check, we compare our limits with that obtained through the cosmic microwave background faraday rotation effect and BBN. The limits range between 1.5 nG and 4.5 nG for n{sub B} in (- 3; -1.5).

  11. Recovery Act - Large Scale SWNT Purification and Solubilization

    SciTech Connect (OSTI)

    Michael Gemano; Dr. Linda B. McGown

    2010-10-07

    The goal of this Phase I project was to establish a quantitative foundation for development of binary G-gels for large-scale, commercial processing of SWNTs and to develop scientific insight into the underlying mechanisms of solubilization, selectivity and alignment. In order to accomplish this, we performed systematic studies to determine the effects of G-gel composition and experimental conditions that will enable us to achieve our goals that include (1) preparation of ultra-high purity SWNTs from low-quality, commercial SWNT starting materials, (2) separation of MWNTs from SWNTs, (3) bulk, non-destructive solubilization of individual SWNTs in aqueous solution at high concentrations (10-100 mg/mL) without sonication or centrifugation, (4) tunable enrichment of subpopulations of the SWNTs based on metallic vs. semiconductor properties, diameter, or chirality and (5) alignment of individual SWNTs.

  12. Impacts of Large Amounts of Wind Power on Design and Operation of Power Systems; Results of IEA Collaboration

    SciTech Connect (OSTI)

    Parsons, B. and Ela, E.; Holttinen, H.; Meibom, P.; Orths, A.; O'Malley, M.; Ummels, B.C.; Tande, J.

    2008-06-01

    There are a multitude of studies completed and ongoing related to the cost of wind integration. However, the results are not easy to compare. An international forum for exchange of knowledge of power system impacts of wind power has been formed under the IEA Implementing Agreement on Wind Energy. IEA WIND R&D Task 25 on “Design and Operation of Power Systems with Large Amounts of Wind Power” produced a state-of-the-art report in October 2007, where the most relevant wind-power grid integration studies were analyzed, especially regarding methodologies and input data. This paper summarizes the results from 18 case studies, with discussion on differences in methodology as well as issues that have been identified to impact the cost of wind integration.

  13. Training a Large Scale Classifier with the Quantum Adiabatic Algorithm

    E-Print Network [OSTI]

    Hartmut Neven; Vasil S. Denchev; Geordie Rose; William G. Macready

    2009-12-04

    In a previous publication we proposed discrete global optimization as a method to train a strong binary classifier constructed as a thresholded sum over weak classifiers. Our motivation was to cast the training of a classifier into a format amenable to solution by the quantum adiabatic algorithm. Applying adiabatic quantum computing (AQC) promises to yield solutions that are superior to those which can be achieved with classical heuristic solvers. Interestingly we found that by using heuristic solvers to obtain approximate solutions we could already gain an advantage over the standard method AdaBoost. In this communication we generalize the baseline method to large scale classifier training. By large scale we mean that either the cardinality of the dictionary of candidate weak classifiers or the number of weak learners used in the strong classifier exceed the number of variables that can be handled effectively in a single global optimization. For such situations we propose an iterative and piecewise approach in which a subset of weak classifiers is selected in each iteration via global optimization. The strong classifier is then constructed by concatenating the subsets of weak classifiers. We show in numerical studies that the generalized method again successfully competes with AdaBoost. We also provide theoretical arguments as to why the proposed optimization method, which does not only minimize the empirical loss but also adds L0-norm regularization, is superior to versions of boosting that only minimize the empirical loss. By conducting a Quantum Monte Carlo simulation we gather evidence that the quantum adiabatic algorithm is able to handle a generic training problem efficiently.

  14. Bias in the Effective Field Theory of Large Scale Structures

    E-Print Network [OSTI]

    Leonardo Senatore

    2014-11-05

    We study how to describe collapsed objects, such as galaxies, in the context of the Effective Field Theory of Large Scale Structures. The overdensity of galaxies at a given location and time is determined by the initial tidal tensor, velocity gradients and spatial derivatives of the regions of dark matter that, during the evolution of the universe, ended up at that given location. Similarly to what recently done for dark matter, we show how this Lagrangian space description can be recovered by upgrading simpler Eulerian calculations. We describe the Eulerian theory. We show that it is perturbatively local in space, but non-local in time, and we explain the observational consequences of this fact. We give an argument for why to a certain degree of accuracy the theory can be considered as quasi time-local and explain what the operator structure is in this case. We describe renormalization of the bias coefficients so that, after this and after upgrading the Eulerian calculation to a Lagrangian one, the perturbative series for galaxies correlation functions results in a manifestly convergent expansion in powers of $k/k_{\\rm NL}$ and $k/k_{\\rm M}$, where $k$ is the wavenumber of interest, $k_{\\rm NL}$ is the wavenumber associated to the non-linear scale, and $k_{\\rm M}$ is the comoving wavenumber enclosing the mass of a galaxy.

  15. Large-Scale Magnetic Fields, Dark Energy and QCD

    E-Print Network [OSTI]

    Federico R. Urban; Ariel R. Zhitnitsky

    2010-08-20

    Cosmological magnetic fields are being observed with ever increasing correlation lengths, possibly reaching the size of superclusters, therefore disfavouring the conventional picture of generation through primordial seeds later amplified by galaxy-bound dynamo mechanisms. In this paper we put forward a fundamentally different approach that links such large-scale magnetic fields to the cosmological vacuum energy. In our scenario the dark energy is due to the Veneziano ghost (which solves the $U(1)_A$ problem in QCD). The Veneziano ghost couples through the triangle anomaly to the electromagnetic field with a constant which is unambiguously fixed in the standard model. While this interaction does not produce any physical effects in Minkowski space, it triggers the generation of a magnetic field in an expanding universe at every epoch. The induced energy of the magnetic field is thus proportional to cosmological vacuum energy: $\\rho_{EM}\\simeq B^2 \\simeq (\\frac{\\alpha}{4\\pi})^2 \\rho_{DE}$, $\\rho_{DE}$ hence acting as a source for the magnetic energy $\\rho_{EM}$. The corresponding numerical estimate leads to a magnitude in the nG range. There are two unique and distinctive predictions of our proposal: an uninterrupted active generation of Hubble size correlated magnetic fields throughout the evolution of the universe; the presence of parity violation on the enormous scales $1/H$, which apparently has been already observed in CMB. These predictions are entirely rooted into the standard model of particle physics.

  16. Sandia Energy - Computational Fluid Dynamics & Large-Scale Uncertainty...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Simulation of a synthetic gust (inviscid Taylor Vortex) passing through a 3-bladed Vertical Axis Wind Turbine rotor. By cwdd|2015-04-20T14:47:52+00:00April 17th,...

  17. Dynamic Response of Large Wind Power Plant Affected by Diverse Conditions at Individual Turbines

    SciTech Connect (OSTI)

    Elizondo, Marcelo A.; Lu, Shuai; Lin, Guang; Wang, Shaobu

    2014-07-31

    Diverse operating conditions at individual wind turbine generators (WTG) within wind power plants (WPPs) can affect the WPP dynamic response to system faults. For example, individual WTGs can experience diverse terminal voltage and power output caused by different wind direction and speed, affecting the response of protection and control limiters. In this paper, we present a study to investigate the dynamic response of a detailed WPP model under diverse power outputs of its individual WTGs. Wake effect is considered as the reason for diverse power outputs. The diverse WTG power output is evaluated in a test system where a large 168-machine test WPP is connected to the IEEE-39-bus system. The power output from each WTG is derived from a wake effect model that uses realistic statistical data for incoming wind speed and direction. The results show that diverse WTG output due to wake effect can affect the WPP dynamic response activating specialized control in some turbines. In addition, transient stability is affected by exhibiting uncertainty in critical clearing time calculation.

  18. Cosmological implications of the CMB large-scale structure

    SciTech Connect (OSTI)

    Melia, Fulvio

    2015-01-01

    The Wilkinson Microwave Anisotropy Probe (WMAP) and Planck may have uncovered several anomalies in the full cosmic microwave background (CMB) sky that could indicate possible new physics driving the growth of density fluctuations in the early universe. These include an unusually low power at the largest scales and an apparent alignment of the quadrupole and octopole moments. In a ?CDM model where the CMB is described by a Gaussian Random Field, the quadrupole and octopole moments should be statistically independent. The emergence of these low probability features may simply be due to posterior selections from many such possible effects, whose occurrence would therefore not be as unlikely as one might naively infer. If this is not the case, however, and if these features are not due to effects such as foreground contamination, their combined statistical significance would be equal to the product of their individual significances. In the absence of such extraneous factors, and ignoring the biasing due to posterior selection, the missing large-angle correlations would have a probability as low as ?0.1% and the low-l multipole alignment would be unlikely at the ?4.9% level; under the least favorable conditions, their simultaneous observation in the context of the standard model could then be likely at only the ?0.005% level. In this paper, we explore the possibility that these features are indeed anomalous, and show that the corresponding probability of CMB multipole alignment in the R{sub h}=ct universe would then be ?7–10%, depending on the number of large-scale Sachs–Wolfe induced fluctuations. Since the low power at the largest spatial scales is reproduced in this cosmology without the need to invoke cosmic variance, the overall likelihood of observing both of these features in the CMB is ?7%, much more likely than in ?CDM, if the anomalies are real. The key physical ingredient responsible for this difference is the existence in the former of a maximum fluctuation size at the time of recombination, which is absent in the latter because of inflation.

  19. Large Scale Obscuration and Related Climate Effects Workshop: Proceedings

    SciTech Connect (OSTI)

    Zak, B.D.; Russell, N.A.; Church, H.W.; Einfeld, W.; Yoon, D.; Behl, Y.K.

    1994-05-01

    A Workshop on Large Scale Obsurcation and Related Climate Effects was held 29--31 January, 1992, in Albuquerque, New Mexico. The objectives of the workshop were: to determine through the use of expert judgement the current state of understanding of regional and global obscuration and related climate effects associated with nuclear weapons detonations; to estimate how large the uncertainties are in the parameters associated with these phenomena (given specific scenarios); to evaluate the impact of these uncertainties on obscuration predictions; and to develop an approach for the prioritization of further work on newly-available data sets to reduce the uncertainties. The workshop consisted of formal presentations by the 35 participants, and subsequent topical working sessions on: the source term; aerosol optical properties; atmospheric processes; and electro-optical systems performance and climatic impacts. Summaries of the conclusions reached in the working sessions are presented in the body of the report. Copies of the transparencies shown as part of each formal presentation are contained in the appendices (microfiche).

  20. Large scale electromechanical transistor with application in mass sensing

    SciTech Connect (OSTI)

    Jin, Leisheng; Li, Lijie

    2014-12-07

    Nanomechanical transistor (NMT) has evolved from the single electron transistor, a device that operates by shuttling electrons with a self-excited central conductor. The unfavoured aspects of the NMT are the complexity of the fabrication process and its signal processing unit, which could potentially be overcome by designing much larger devices. This paper reports a new design of large scale electromechanical transistor (LSEMT), still taking advantage of the principle of shuttling electrons. However, because of the large size, nonlinear electrostatic forces induced by the transistor itself are not sufficient to drive the mechanical member into vibration—an external force has to be used. In this paper, a LSEMT device is modelled, and its new application in mass sensing is postulated using two coupled mechanical cantilevers, with one of them being embedded in the transistor. The sensor is capable of detecting added mass using the eigenstate shifts method by reading the change of electrical current from the transistor, which has much higher sensitivity than conventional eigenfrequency shift approach used in classical cantilever based mass sensors. Numerical simulations are conducted to investigate the performance of the mass sensor.

  1. Design advanced for large-scale, economic, floating LNG plant

    SciTech Connect (OSTI)

    Naklie, M.M.

    1997-06-30

    A floating LNG plant design has been developed which is technically feasible, economical, safe, and reliable. This technology will allow monetization of small marginal fields and improve the economics of large fields. Mobil`s world-scale plant design has a capacity of 6 million tons/year of LNG and up to 55,000 b/d condensate produced from 1 bcfd of feed gas. The plant would be located on a large, secure, concrete barge with a central moonpool. LNG storage is provided for 250,000 cu m and condensate storage for 650,000 bbl. And both products are off-loaded from the barge. Model tests have verified the stability of the barge structure: barge motions are low enough to permit the plant to continue operation in a 100-year storm in the Pacific Rim. Moreover, the barge is spread-moored, eliminating the need for a turret and swivel. Because the design is generic, the plant can process a wide variety of feed gases and operate in different environments, should the plant be relocated. This capability potentially gives the plant investment a much longer project life because its use is not limited to the life of only one producing area.

  2. Spectral Features of Magnetic Fluctuations at Proton Scales from Fast to Slow Solar Wind

    E-Print Network [OSTI]

    Bruno, R

    2015-01-01

    This Letter investigates the spectral characteristics of the interplanetary magnetic field fluctuations at proton scales during several time intervals chosen along the speed profile of a fast stream. The character of the fluctuations within the first frequency decade, beyond the high frequency break located between the fluid and the kinetic regime, strongly depends on the type of wind. While the fast wind shows a clear signature of both right handed and left handed polarized fluctuations, possibly associated with KAW and Ion-Cyclotron waves, respectively, the rarefaction region, where the wind speed and the Alfv\\'{e}nicity of low frequency fluctuations decrease, shows a rapid disappearance of the ion-cyclotron signature followed by a more gradual disappearance of the KAWs. Moreover, also the power associated to perpendicular and parallel fluctuations experiences a rapid depletion, keeping, however, the power anisotropy in favour of the perpendicular spectrum.

  3. Large-Scale Data Challenges in Future Power Grids

    SciTech Connect (OSTI)

    Yin, Jian; Sharma, Poorva; Gorton, Ian; Akyol, Bora A.

    2013-03-25

    This paper describes technical challenges in supporting large-scale real-time data analysis for future power grid systems and discusses various design options to address these challenges. Even though the existing U.S. power grid has served the nation remarkably well over the last 120 years, big changes are in the horizon. The widespread deployment of renewable generation, smart grid controls, energy storage, plug-in hybrids, and new conducting materials will require fundamental changes in the operational concepts and principal components. The whole system becomes highly dynamic and needs constant adjustments based on real time data. Even though millions of sensors such as phase measurement units (PMUs) and smart meters are being widely deployed, a data layer that can support this amount of data in real time is needed. Unlike the data fabric in cloud services, the data layer for smart grids must address some unique challenges. This layer must be scalable to support millions of sensors and a large number of diverse applications and still provide real time guarantees. Moreover, the system needs to be highly reliable and highly secure because the power grid is a critical piece of infrastructure. No existing systems can satisfy all the requirements at the same time. We examine various design options. In particular, we explore the special characteristics of power grid data to meet both scalability and quality of service requirements. Our initial prototype can improve performance by orders of magnitude over existing general-purpose systems. The prototype was demonstrated with several use cases from PNNL’s FPGI and was shown to be able to integrate huge amount of data from a large number of sensors and a diverse set of applications.

  4. Reducing Data Center Loads for a Large-Scale, Net Zero Office...

    Energy Savers [EERE]

    Reducing Data Center Loads for a Large-Scale, Net Zero Office Building Reducing Data Center Loads for a Large-Scale, Net Zero Office Building Document describes the design,...

  5. The IR-resummed Effective Field Theory of Large Scale Structures...

    Office of Scientific and Technical Information (OSTI)

    The IR-resummed Effective Field Theory of Large Scale Structures Citation Details In-Document Search Title: The IR-resummed Effective Field Theory of Large Scale Structures We...

  6. HyLights -- Tools to Prepare the Large-Scale European Demonstration...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    HyLights -- Tools to Prepare the Large-Scale European Demonstration Projects on Hydrogen for Transport HyLights -- Tools to Prepare the Large-Scale European Demonstration Projects...

  7. PROPERTIES IMPORTANT TO MIXING FOR WTP LARGE SCALE INTEGRATED TESTING

    SciTech Connect (OSTI)

    Koopman, D.; Martino, C.; Poirier, M.

    2012-04-26

    Large Scale Integrated Testing (LSIT) is being planned by Bechtel National, Inc. to address uncertainties in the full scale mixing performance of the Hanford Waste Treatment and Immobilization Plant (WTP). Testing will use simulated waste rather than actual Hanford waste. Therefore, the use of suitable simulants is critical to achieving the goals of the test program. External review boards have raised questions regarding the overall representativeness of simulants used in previous mixing tests. Accordingly, WTP requested the Savannah River National Laboratory (SRNL) to assist with development of simulants for use in LSIT. Among the first tasks assigned to SRNL was to develop a list of waste properties that matter to pulse-jet mixer (PJM) mixing of WTP tanks. This report satisfies Commitment 5.2.3.1 of the Department of Energy Implementation Plan for Defense Nuclear Facilities Safety Board Recommendation 2010-2: physical properties important to mixing and scaling. In support of waste simulant development, the following two objectives are the focus of this report: (1) Assess physical and chemical properties important to the testing and development of mixing scaling relationships; (2) Identify the governing properties and associated ranges for LSIT to achieve the Newtonian and non-Newtonian test objectives. This includes the properties to support testing of sampling and heel management systems. The test objectives for LSIT relate to transfer and pump out of solid particles, prototypic integrated operations, sparger operation, PJM controllability, vessel level/density measurement accuracy, sampling, heel management, PJM restart, design and safety margin, Computational Fluid Dynamics (CFD) Verification and Validation (V and V) and comparison, performance testing and scaling, and high temperature operation. The slurry properties that are most important to Performance Testing and Scaling depend on the test objective and rheological classification of the slurry (i.e., Newtonian or non-Newtonian). The most important properties for testing with Newtonian slurries are the Archimedes number distribution and the particle concentration. For some test objectives, the shear strength is important. In the testing to collect data for CFD V and V and CFD comparison, the liquid density and liquid viscosity are important. In the high temperature testing, the liquid density and liquid viscosity are important. The Archimedes number distribution combines effects of particle size distribution, solid-liquid density difference, and kinematic viscosity. The most important properties for testing with non-Newtonian slurries are the slurry yield stress, the slurry consistency, and the shear strength. The solid-liquid density difference and the particle size are also important. It is also important to match multiple properties within the same simulant to achieve behavior representative of the waste. Other properties such as particle shape, concentration, surface charge, and size distribution breadth, as well as slurry cohesiveness and adhesiveness, liquid pH and ionic strength also influence the simulant properties either directly or through other physical properties such as yield stress.

  8. Large-Scale Spray Releases: Initial Aerosol Test Results

    SciTech Connect (OSTI)

    Schonewill, Philip P.; Gauglitz, Phillip A.; Bontha, Jagannadha R.; Daniel, Richard C.; Kurath, Dean E.; Adkins, Harold E.; Billing, Justin M.; Burns, Carolyn A.; Davis, James M.; Enderlin, Carl W.; Fischer, Christopher M.; Jenks, Jeromy WJ; Lukins, Craig D.; MacFarlan, Paul J.; Shutthanandan, Janani I.; Smith, Dennese M.

    2012-12-01

    One of the events postulated in the hazard analysis at the Waste Treatment and Immobilization Plant (WTP) and other U.S. Department of Energy (DOE) nuclear facilities is a breach in process piping that produces aerosols with droplet sizes in the respirable range. The current approach for predicting the size and concentration of aerosols produced in a spray leak involves extrapolating from correlations reported in the literature. These correlations are based on results obtained from small engineered spray nozzles using pure liquids with Newtonian fluid behavior. The narrow ranges of physical properties on which the correlations are based do not cover the wide range of slurries and viscous materials that will be processed in the WTP and across processing facilities in the DOE complex. Two key technical areas were identified where testing results were needed to improve the technical basis by reducing the uncertainty due to extrapolating existing literature results. The first technical need was to quantify the role of slurry particles in small breaches where the slurry particles may plug and result in substantially reduced, or even negligible, respirable fraction formed by high-pressure sprays. The second technical need was to determine the aerosol droplet size distribution and volume from prototypic breaches and fluids, specifically including sprays from larger breaches with slurries where data from the literature are scarce. To address these technical areas, small- and large-scale test stands were constructed and operated with simulants to determine aerosol release fractions and generation rates from a range of breach sizes and geometries. The properties of the simulants represented the range of properties expected in the WTP process streams and included water, sodium salt solutions, slurries containing boehmite or gibbsite, and a hazardous chemical simulant. The effect of anti-foam agents was assessed with most of the simulants. Orifices included round holes and rectangular slots. The round holes ranged in size from 0.2 to 4.46 mm. The slots ranged from (width × length) 0.3 × 5 to 2.74 × 76.2 mm. Most slots were oriented longitudinally along the pipe, but some were oriented circumferentially. In addition, a limited number of multi-hole test pieces were tested in an attempt to assess the impact of a more complex breach. Much of the testing was conducted at pressures of 200 and 380 psi, but some tests were conducted at 100 psi. Testing the largest postulated breaches was deemed impractical because of the large size of some of the WTP equipment. The purpose of this report is to present the experimental results and analyses for the aerosol measurements obtained in the large-scale test stand. The report includes a description of the simulants used and their properties, equipment and operations, data analysis methodology, and test results. The results of tests investigating the role of slurry particles in plugging of small breaches are reported in Mahoney et al. 2012a. The results of the aerosol measurements in the small-scale test stand are reported in Mahoney et al. (2012b).

  9. SMALL AND LARGE-SCALE MAGNETIC FIELDS INVOLVED WITH SOLAR FLARES

    E-Print Network [OSTI]

    ABSTRACT SMALL AND LARGE-SCALE MAGNETIC FIELDS INVOLVED WITH SOLAR FLARES by Chang Liu Solar flares of an EUV sigmoid. #12;SMALL AND LARGE-SCALE MAGNETIC FIELDS INVOLVED WITH SOLAR FLARES by Chang Liu RESERVED #12;APPROVAL PAGE SMALL AND LARGE-SCALE MAGNETIC FIELDS INVOLVED WITH SOLAR FLARES Chang Liu Dr

  10. Microwave Mapping As a Possible New Diagnostic Tool for LargeScale Solar Magnetic Fields

    E-Print Network [OSTI]

    Petrovay, Kristóf

    Microwave Mapping As a Possible New Diagnostic Tool for Large­Scale Solar Magnetic Fields M of microwave maps in the study of weak large­scale solar magnetic fields is discussed. Our knowledge of the large­scale solar background magnetic fields is limited by the circumstance that magnetograph

  11. UNIVERSITY OF SOUTHERN CALIFORNIA Large-Scale Active Middleware (LSAM) September 3, 1997 1 of 27

    E-Print Network [OSTI]

    Touch, Joe

    transport UNIVERSITY OF SOUTHERN CALIFORNIA Large-Scale Active Middleware (LSAM) September 3, 1997 8 of 27UNIVERSITY OF SOUTHERN CALIFORNIA Large-Scale Active Middleware (LSAM) September 3, 1997 1 of 27 Middleware Project USC/ISI Computer Networks Division UNIVERSITY OF SOUTHERN CALIFORNIA Large-Scale Active

  12. Analyzing the interaction between state tax incentives and the federal production tax credit for wind power

    E-Print Network [OSTI]

    Wiser, Ryan; Bolinger, Mark; Gagliano, Troy

    2002-01-01

    Production Tax Credit for Wind Power Ryan Wiser and MarkState Policies Foster a Wind Power Resurgence The ImportancePTC) for large-scale wind power projects. While the federal

  13. The Cost of Transmission for Wind Energy: A Review of Transmission Planning Studies

    E-Print Network [OSTI]

    Mills, Andrew D.

    2009-01-01

    pdf/0554(2008).pdf European Wind Energy Association (EWEA).Large Scale Integration of Wind Energy in the European PowerPrepared by the European Wind Energy Association. http://

  14. Surpassing Expectations: State of the U.S. Wind Power Market

    E-Print Network [OSTI]

    Bolinger, Mark A

    2009-01-01

    States, new large-scale wind turbines were installed in 18The average size of wind turbines installed in the Uniteddominant manufacturer of wind turbines supplying the U.S.

  15. Development of a Large-Scale Ubiquitous Computing Interface We propose the development of a unique experimental facility for the exploration of large-scale ubiquitous computing

    E-Print Network [OSTI]

    Haro, Antonio

    Development of a Large-Scale Ubiquitous Computing Interface 1 Summary We propose the development of a unique experimental facility for the exploration of large-scale ubiquitous computing interfaces reveal how it will be used and the scientific issues raised. Current ubiquitous computing experiments

  16. ANALYSIS OF TURBULENT MIXING JETS IN LARGE SCALE TANK

    SciTech Connect (OSTI)

    Lee, S; Richard Dimenna, R; Robert Leishear, R; David Stefanko, D

    2007-03-28

    Flow evolution models were developed to evaluate the performance of the new advanced design mixer pump for sludge mixing and removal operations with high-velocity liquid jets in one of the large-scale Savannah River Site waste tanks, Tank 18. This paper describes the computational model, the flow measurements used to provide validation data in the region far from the jet nozzle, the extension of the computational results to real tank conditions through the use of existing sludge suspension data, and finally, the sludge removal results from actual Tank 18 operations. A computational fluid dynamics approach was used to simulate the sludge removal operations. The models employed a three-dimensional representation of the tank with a two-equation turbulence model. Both the computational approach and the models were validated with onsite test data reported here and literature data. The model was then extended to actual conditions in Tank 18 through a velocity criterion to predict the ability of the new pump design to suspend settled sludge. A qualitative comparison with sludge removal operations in Tank 18 showed a reasonably good comparison with final results subject to significant uncertainties in actual sludge properties.

  17. Importance-Truncated Large-Scale Shell Model

    E-Print Network [OSTI]

    Stumpf, Christina; Roth, Robert

    2015-01-01

    We propose an importance-truncation scheme for the large-scale nuclear shell model that extends its range of applicability to larger valence spaces and mid-shell nuclei. It is based on a perturbative measure for the importance of individual basis states that acts as an additional truncation for the many-body model space in which the eigenvalue problem of the Hamiltonian is solved numerically. Through a posteriori extrapolations of all observables to vanishing importance threshold, the full shell-model results can be recovered. In addition to simple threshold extrapolations, we explore extrapolations based on the energy variance. We apply the importance-truncated shell model for the study of 56-Ni in the pf valence space and of 60-Zn and 64-Ge in the pfg9/2 space. We demonstrate the efficiency and accuracy of the approach, which pave the way for future shell-model calculations in larger valence spaces with valence-space interactions derived in ab initio approaches.

  18. MULTI-SPACECRAFT OBSERVATIONS OF LINEAR MODES AND SIDEBAND WAVES IN ION-SCALE SOLAR WIND TURBULENCE

    SciTech Connect (OSTI)

    Perschke, Christopher; Motschmann, Uwe; Narita, Yasuhito; Glassmeier, Karl-Heinz

    2014-10-01

    In the scenario of weak turbulence, energy is believed to be cascaded from smaller to larger wave numbers and frequencies due to weak wave-wave interactions. Based on its perturbative treatment one may regard plasma turbulence as a superposition of linear modes (or normal modes) and sideband waves (or nonlinear modes). In this study, we use magnetic field and plasma measurements of nine solar wind events obtained by the Cluster spacecraft and make extensive use of a high-resolution wave vector analysis method, the Multi-point Signal Resonator technique, to find frequencies and wave vectors of discrete modes on ion kinetic scales in the plasma rest frame. The primarily unstructured wave observations in the frequency-wave number diagram are classified into three distinct linear modes (proton Bernstein modes, helium-alpha Bernstein modes, and kinetic Alfvén waves) and the sideband waves by comparing with the dispersion relations derived theoretically from linear Vlasov theory using observational values of the plasma parameter beta and the propagation angle from the mean magnetic field. About 60% of the observed discrete modes can be explained by the linear modes, primarily as the proton Bernstein and the kinetic Alfvén waves, within the frequency uncertainties, while the rest of the population (about 40%) cannot be classified as linear modes due to the large deviation from dispersion relations. We conclude that both the linear modes and sideband wave components are needed to construct the wave picture of solar wind turbulence on ion-kinetic scales.

  19. Model Reduction of Large-Scale Dynamical A. Antoulas1

    E-Print Network [OSTI]

    Van Dooren, Paul

    , and structural response of high-rise buildings to wind and earthquakes), electronic circuit simulation systems in which real- time prognostics and prediction are required, constraints on compute power, memory response characteristics. Two main themes can be identified among several methodologies: (a) balancing

  20. Model Abstraction Techniques for Large-Scale Power Systems

    E-Print Network [OSTI]

    that lend themselves to assessment of the impact of wind energy. The first part of the re- port summarizes of Energy Office of Electricity Delivery and Energy Reliability Under Cooperative Agreement No. DE-FC26-06NT42847 Hawai`i Distributed Energy Resource Technologies for Energy Security Subtask 10.3 Deliverable 2

  1. Wind and Wave Extremes over the World Oceans From Very Large Forecast Ensembles

    E-Print Network [OSTI]

    Breivik, Øyvind; Abdalla, Saleh; Bidlot, Jean-Raymond

    2013-01-01

    Global return value estimates of significant wave height and 10-m neutral wind speed are estimated from very large aggregations of archived ECMWF ensemble forecasts at +240-h lead time from the period 2003-2012. The upper percentiles are found to match ENVISAT wind speed better than ERA-Interim (ERA-I), which tends to be biased low. The return estimates are significantly higher for both wind speed and wave height in the extratropics and the subtropics than what is found from ERA-I, but lower than what is reported by Caires and Sterl (2005) and Vinoth and Young (2011). The highest discrepancies between ERA-I and ENS240 are found in the hurricane-prone areas, suggesting that the ensemble comes closer than ERA-I in capturing the intensity of tropical cyclones. The width of the confidence intervals are typically reduced by 70% due to the size of the data sets. Finally, non-parametric estimates of return values were computed from the tail of the distribution. These direct return estimates compare very well with Ge...

  2. Analysis of Wind Power and Load Data at Multiple Time Scales

    E-Print Network [OSTI]

    Coughlin, Katie

    2011-01-01

    The spectrum of power from wind turbines. Journal of PowerAWEA 2010. American Wind Energy Association ProjectsErik and Jason Kemper. 2009. Wind Plant Ramping Behavior.

  3. Analysis of Wind Power and Load Data at Multiple Time Scales

    E-Print Network [OSTI]

    Coughlin, Katie

    2011-01-01

    AWEA 2010. American Wind Energy Association ProjectsR Liao. 2006. Analyses of Wind Energy Impact on WFEC Systemresources. The American Wind Energy Association maintains a

  4. Development of explosive event scale model testing capability at Sandia`s large scale centrifuge facility

    SciTech Connect (OSTI)

    Blanchat, T.K.; Davie, N.T.; Calderone, J.J.

    1998-02-01

    Geotechnical structures such as underground bunkers, tunnels, and building foundations are subjected to stress fields produced by the gravity load on the structure and/or any overlying strata. These stress fields may be reproduced on a scaled model of the structure by proportionally increasing the gravity field through the use of a centrifuge. This technology can then be used to assess the vulnerability of various geotechnical structures to explosive loading. Applications of this technology include assessing the effectiveness of earth penetrating weapons, evaluating the vulnerability of various structures, counter-terrorism, and model validation. This document describes the development of expertise in scale model explosive testing on geotechnical structures using Sandia`s large scale centrifuge facility. This study focused on buried structures such as hardened storage bunkers or tunnels. Data from this study was used to evaluate the predictive capabilities of existing hydrocodes and structural dynamics codes developed at Sandia National Laboratories (such as Pronto/SPH, Pronto/CTH, and ALEGRA). 7 refs., 50 figs., 8 tabs.

  5. Advanced I/O for large-scale scientific applications.

    SciTech Connect (OSTI)

    Klasky, Scott (Oak Ridge National Laboratory, Oak Ridge, TN); Schwan, Karsten (Georgia Institute of Technology, Atlanta, GA); Oldfield, Ron A.; Lofstead, Gerald F., II (Georgia Institute of Technology, Atlanta, GA)

    2010-01-01

    As scientific simulations scale to use petascale machines and beyond, the data volumes generated pose a dual problem. First, with increasing machine sizes, the careful tuning of IO routines becomes more and more important to keep the time spent in IO acceptable. It is not uncommon, for instance, to have 20% of an application's runtime spent performing IO in a 'tuned' system. Careful management of the IO routines can move that to 5% or even less in some cases. Second, the data volumes are so large, on the order of 10s to 100s of TB, that trying to discover the scientifically valid contributions requires assistance at runtime to both organize and annotate the data. Waiting for offline processing is not feasible due both to the impact on the IO system and the time required. To reduce this load and improve the ability of scientists to use the large amounts of data being produced, new techniques for data management are required. First, there is a need for techniques for efficient movement of data from the compute space to storage. These techniques should understand the underlying system infrastructure and adapt to changing system conditions. Technologies include aggregation networks, data staging nodes for a closer parity to the IO subsystem, and autonomic IO routines that can detect system bottlenecks and choose different approaches, such as splitting the output into multiple targets, staggering output processes. Such methods must be end-to-end, meaning that even with properly managed asynchronous techniques, it is still essential to properly manage the later synchronous interaction with the storage system to maintain acceptable performance. Second, for the data being generated, annotations and other metadata must be incorporated to help the scientist understand output data for the simulation run as a whole, to select data and data features without concern for what files or other storage technologies were employed. All of these features should be attained while maintaining a simple deployment for the science code and eliminating the need for allocation of additional computational resources.

  6. Large-Scale Sequencing: The Future of Genomic Sciences Colloquium

    SciTech Connect (OSTI)

    Margaret Riley; Merry Buckley

    2009-01-01

    Genetic sequencing and the various molecular techniques it has enabled have revolutionized the field of microbiology. Examining and comparing the genetic sequences borne by microbes - including bacteria, archaea, viruses, and microbial eukaryotes - provides researchers insights into the processes microbes carry out, their pathogenic traits, and new ways to use microorganisms in medicine and manufacturing. Until recently, sequencing entire microbial genomes has been laborious and expensive, and the decision to sequence the genome of an organism was made on a case-by-case basis by individual researchers and funding agencies. Now, thanks to new technologies, the cost and effort of sequencing is within reach for even the smallest facilities, and the ability to sequence the genomes of a significant fraction of microbial life may be possible. The availability of numerous microbial genomes will enable unprecedented insights into microbial evolution, function, and physiology. However, the current ad hoc approach to gathering sequence data has resulted in an unbalanced and highly biased sampling of microbial diversity. A well-coordinated, large-scale effort to target the breadth and depth of microbial diversity would result in the greatest impact. The American Academy of Microbiology convened a colloquium to discuss the scientific benefits of engaging in a large-scale, taxonomically-based sequencing project. A group of individuals with expertise in microbiology, genomics, informatics, ecology, and evolution deliberated on the issues inherent in such an effort and generated a set of specific recommendations for how best to proceed. The vast majority of microbes are presently uncultured and, thus, pose significant challenges to such a taxonomically-based approach to sampling genome diversity. However, we have yet to even scratch the surface of the genomic diversity among cultured microbes. A coordinated sequencing effort of cultured organisms is an appropriate place to begin, since not only are their genomes available, but they are also accompanied by data on environment and physiology that can be used to understand the resulting data. As single cell isolation methods improve, there should be a shift toward incorporating uncultured organisms and communities into this effort. Efforts to sequence cultivated isolates should target characterized isolates from culture collections for which biochemical data are available, as well as other cultures of lasting value from personal collections. The genomes of type strains should be among the first targets for sequencing, but creative culture methods, novel cell isolation, and sorting methods would all be helpful in obtaining organisms we have not yet been able to cultivate for sequencing. The data that should be provided for strains targeted for sequencing will depend on the phylogenetic context of the organism and the amount of information available about its nearest relatives. Annotation is an important part of transforming genome sequences into useful resources, but it represents the most significant bottleneck to the field of comparative genomics right now and must be addressed. Furthermore, there is a need for more consistency in both annotation and achieving annotation data. As new annotation tools become available over time, re-annotation of genomes should be implemented, taking advantage of advancements in annotation techniques in order to capitalize on the genome sequences and increase both the societal and scientific benefit of genomics work. Given the proper resources, the knowledge and ability exist to be able to select model systems, some simple, some less so, and dissect them so that we may understand the processes and interactions at work in them. Colloquium participants suggest a five-pronged, coordinated initiative to exhaustively describe six different microbial ecosystems, designed to describe all the gene diversity, across genomes. In this effort, sequencing should be complemented by other experimental data, particularly transcriptomics and metabolomics data, all of which

  7. Large Scale Computing and Storage Requirements for Nuclear Physics Research

    SciTech Connect (OSTI)

    Gerber, Richard A.; Wasserman, Harvey J.

    2012-03-02

    IThe National Energy Research Scientific Computing Center (NERSC) is the primary computing center for the DOE Office of Science, serving approximately 4,000 users and hosting some 550 projects that involve nearly 700 codes for a wide variety of scientific disciplines. In addition to large-scale computing resources NERSC provides critical staff support and expertise to help scientists make the most efficient use of these resources to advance the scientific mission of the Office of Science. In May 2011, NERSC, DOE’s Office of Advanced Scientific Computing Research (ASCR) and DOE’s Office of Nuclear Physics (NP) held a workshop to characterize HPC requirements for NP research over the next three to five years. The effort is part of NERSC’s continuing involvement in anticipating future user needs and deploying necessary resources to meet these demands. The workshop revealed several key requirements, in addition to achieving its goal of characterizing NP computing. The key requirements include: 1. Larger allocations of computational resources at NERSC; 2. Visualization and analytics support; and 3. Support at NERSC for the unique needs of experimental nuclear physicists. This report expands upon these key points and adds others. The results are based upon representative samples, called “case studies,” of the needs of science teams within NP. The case studies were prepared by NP workshop participants and contain a summary of science goals, methods of solution, current and future computing requirements, and special software and support needs. Participants were also asked to describe their strategy for computing in the highly parallel, “multi-core” environment that is expected to dominate HPC architectures over the next few years. The report also includes a section with NERSC responses to the workshop findings. NERSC has many initiatives already underway that address key workshop findings and all of the action items are aligned with NERSC strategic plans.

  8. Large Scale Deployment of Renewables for Electricity Generation

    E-Print Network [OSTI]

    Neuhoff, Karsten

    2006-03-14

    is the most difficult to predict, but still has capacity factors in the 30 – 40% range. Geothermal is typically available 95% of the time over the productive life of the reservoir, usually 20 – 30 years. Wind, solar and wave intermittency can... conventional uranium reserves and resources of only about 20 million tonnes (this includes estimated resources at extraction costs up to $260/kg). 10 Initially, the production of solar PV cells was rather energy intensive. However, by 1999, rooftop-installed...

  9. Proceedings of the fourth biennial conference and workshop on wind energy conversion systems

    SciTech Connect (OSTI)

    Kottler, R.J. Jr.

    1980-06-01

    Separate abstracts are included for papers presented concerning research and development requirements and utility interface and institutional issues for small-scale systems; design requirements and research and development requirements for large-scale systems; economic and operational requirements of large-scale wind systems; wind characteristics and wind energy siting; international activities; wind energy applications in agriculture; federal commercialization and decentralization plans; and wind energy innovative systems.

  10. Large-Scale Manufacturing of Nanoparticulate-Based Lubrication Additives

    SciTech Connect (OSTI)

    2009-06-01

    This factsheet describes a research project whose goal is to design, develop, manufacture, and scale up boron-based nanoparticulate lubrication additives.

  11. Large-Scale Federal Renewable Energy Projects | Department of...

    Broader source: Energy.gov (indexed) [DOE]

    Renewable energy projects larger than 10 megawatts (MW), also known as utility-scale projects, are complex and typically require private-sector financing. The Federal Energy...

  12. Small-scale wind turbines in cities and suburbs S Tullis, K Aly, R Bravo, A Fiedler, S Kooiman, K McLaren S Ziada

    E-Print Network [OSTI]

    Tullis, Stephen

    -uniform wind into turbine High tip speeds lead to noise #12;Vertical axis wind turbines Combination of blade #12;Horizontal axis small wind turbines Numerous suppliers of turbines for tower/field installationSmall-scale wind turbines in cities and suburbs S Tullis, K Aly, R Bravo, A Fiedler, S Kooiman, K

  13. An Energy-Efficient Framework for Large-Scale Parallel Storage Systems

    E-Print Network [OSTI]

    Qin, Xiao

    An Energy-Efficient Framework for Large-Scale Parallel Storage Systems Ziliang Zong, Matt Briggs-scale and energy-efficient parallel storage systems. To validate the efficiency of the proposed framework, a buffer that this new framework can significantly improves the energy efficiency of large-scale parallel storage systems

  14. Nonlinear and linear timescales near kinetic scales in solar wind turbulence

    SciTech Connect (OSTI)

    Matthaeus, W. H.; Wan, M.; Shay, M. A.; Oughton, S.; Osman, K. T.; Chapman, S. C.; Servidio, S.; Valentini, F.; Gary, S. P.; Roytershteyn, V.; Karimabadi, H.

    2014-08-01

    The application of linear kinetic treatments to plasma waves, damping, and instability requires favorable inequalities between the associated linear timescales and timescales for nonlinear (e.g., turbulence) evolution. In the solar wind these two types of timescales may be directly compared using standard Kolmogorov-style analysis and observational data. The estimated local (in scale) nonlinear magnetohydrodynamic cascade times, evaluated as relevant kinetic scales are approached, remain slower than the cyclotron period, but comparable to or faster than the typical timescales of instabilities, anisotropic waves, and wave damping. The variation with length scale of the turbulence timescales is supported by observations and simulations. On this basis the use of linear theory—which assumes constant parameters to calculate the associated kinetic rates—may be questioned. It is suggested that the product of proton gyrofrequency and nonlinear time at the ion gyroscales provides a simple measure of turbulence influence on proton kinetic behavior.

  15. PATHWAYS OF LARGE-SCALE MAGNETIC COUPLINGS BETWEEN SOLAR CORONAL EVENTS

    SciTech Connect (OSTI)

    Schrijver, Carolus J.; Title, Alan M.; DeRosa, Marc L.; Yeates, Anthony R.

    2013-08-20

    The high-cadence, comprehensive view of the solar corona by SDO/AIA shows many events that are widely separated in space while occurring close together in time. In some cases, sets of coronal events are evidently causally related, while in many other instances indirect evidence can be found. We present case studies to highlight a variety of coupling processes involved in coronal events. We find that physical linkages between events do occur, but concur with earlier studies that these couplings appear to be crucial to understanding the initiation of major eruptive or explosive phenomena relatively infrequently. We note that the post-eruption reconfiguration timescale of the large-scale corona, estimated from the extreme-ultraviolet afterglow, is on average longer than the mean time between coronal mass ejections (CMEs), so that many CMEs originate from a corona that is still adjusting from a previous event. We argue that the coronal field is intrinsically global: current systems build up over days to months, the relaxation after eruptions continues over many hours, and evolving connections easily span much of a hemisphere. This needs to be reflected in our modeling of the connections from the solar surface into the heliosphere to properly model the solar wind, its perturbations, and the generation and propagation of solar energetic particles. However, the large-scale field cannot be constructed reliably by currently available observational resources. We assess the potential of high-quality observations from beyond Earth's perspective and advanced global modeling to understand the couplings between coronal events in the context of CMEs and solar energetic particle events.

  16. American Institute of Aeronautics and Astronautics Aeroelastic Modeling of Large Offshore Vertical-axis Wind

    E-Print Network [OSTI]

    Vertical-axis Wind Turbines: Development of the Offshore Wind Energy Simulation Toolkit Brian C. Owens will argue, the vertical-axis wind turbine (VAWT)2 has the potential to alleviate many challenges encountered advantages over the horizontal-axis wind turbine configuration in the offshore arena. VAWTs, however

  17. Large Scale Computing and Storage Requirements for High Energy Physics

    SciTech Connect (OSTI)

    Gerber, Richard A.; Wasserman, Harvey

    2010-11-24

    The National Energy Research Scientific Computing Center (NERSC) is the leading scientific computing facility for the Department of Energy's Office of Science, providing high-performance computing (HPC) resources to more than 3,000 researchers working on about 400 projects. NERSC provides large-scale computing resources and, crucially, the support and expertise needed for scientists to make effective use of them. In November 2009, NERSC, DOE's Office of Advanced Scientific Computing Research (ASCR), and DOE's Office of High Energy Physics (HEP) held a workshop to characterize the HPC resources needed at NERSC to support HEP research through the next three to five years. The effort is part of NERSC's legacy of anticipating users needs and deploying resources to meet those demands. The workshop revealed several key points, in addition to achieving its goal of collecting and characterizing computing requirements. The chief findings: (1) Science teams need access to a significant increase in computational resources to meet their research goals; (2) Research teams need to be able to read, write, transfer, store online, archive, analyze, and share huge volumes of data; (3) Science teams need guidance and support to implement their codes on future architectures; and (4) Projects need predictable, rapid turnaround of their computational jobs to meet mission-critical time constraints. This report expands upon these key points and includes others. It also presents a number of case studies as representative of the research conducted within HEP. Workshop participants were asked to codify their requirements in this case study format, summarizing their science goals, methods of solution, current and three-to-five year computing requirements, and software and support needs. Participants were also asked to describe their strategy for computing in the highly parallel, multi-core environment that is expected to dominate HPC architectures over the next few years. The report includes a section that describes efforts already underway or planned at NERSC that address requirements collected at the workshop. NERSC has many initiatives in progress that address key workshop findings and are aligned with NERSC's strategic plans.

  18. Issues in strategic management of large-scale software product line development

    E-Print Network [OSTI]

    Nivoit, Jean-Baptiste (Jean-Baptiste Henri)

    2013-01-01

    This thesis reflects on the issues and challenges large software product engineering managers face. Software is hard to engineer on a small scale, but at a larger scale, engineering and management tasks are even more ...

  19. Organization of Energetic Particles by the Solar Wind Structure During the Declining to Minimum Phase of Solar Cycle 23

    E-Print Network [OSTI]

    2010-01-01

    Feldman, W.C. : 1978, Solar wind stream interfaces. J.of large-scale solar wind structures. Ph.D. dissertation,R.M. : 2008, Weaker solar wind from the polar coronal holes

  20. Large-Scale Manufacturing of Nanoparticle-Based Lubrication Additives

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    component failure. Poor lubricant performance can cause significant energy and material losses. The already large global demand for lubricants is expected to continue growing in...

  1. Parallel distributed-memory simplex for large-scale stochastic LP problems

    E-Print Network [OSTI]

    Hall, Julian

    T p = eT p B-1 BTRAN aT p = T p N PRICE aq = B-1aq FTRAN Invert B INVERT Hyper-sparsity Vectors ep-scale stochastic LP problems 7 / 23 #12;Stochastic MIP problems: For Argonne Power systems optimization project at Argonne Integer second-stage decisions Stochasticity comes from availability of wind-generated electricity

  2. Hydrodynamical numerical simulation of wind production from black hole hot accretion flows at very large radii

    E-Print Network [OSTI]

    Bu, De-Fu; Gan, Zhao-Ming; Yang, Xiao-hong

    2015-01-01

    In previous works, it has been shown that strong winds exist in hot accretion flows around black holes. Those works focus only on the region close to the black hole thus it is unknown whether or where the wind production stops at large radii. In this paper, we investigate this problem based on hydrodynamical numerical simulations. For this aim, we have taken into account the gravity of both the central black hole and the nuclear star clusters. When calculating the latter, we assume that the velocity dispersion of stars is a constant and the gravitational potential of the nuclear star cluster $\\propto \\sigma^2 \\ln (r)$, where $\\sigma$ is the velocity dispersion of stars and $r$ is the distance from the center of the galaxy. Different from previous works, we focus on the region where the gravitational potential is dominated by the star cluster. We find that, same as the accretion flow at small radii, the mass inflow rate decreases inward and the flow is convectively unstable. However, trajectory analysis has sh...

  3. Large-Scale Production of Marine Microalgae for Fuel and Feeds

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Review Large-Scale Production of Marine Microalgae for Fuel and Feeds March 24, 2015 Algae Platform Review Mark Huntley Cornell Marine Algal Biofuels Consortium This...

  4. A Tractable Approach to Understanding the Results from Large-Scale 3D Transient

    E-Print Network [OSTI]

    Peraire, Jaime

    ) problems or NASA's HPCC (High Performance Computing & Communication) grand challenges, can easily. Introduction Large-scale simulations of physical phenomena on high performance computing systems (often on mas

  5. Asymmetry in In-Degree and Out-Degree Distributions of Large-Scale Industrial Networks

    E-Print Network [OSTI]

    Luo, Jianxi; Whitney, Daniel E.

    2015-01-01

    Network structures in industrial pricing: the effect ofrecession? ranking U.S. industrial sectors by the Power-of-distributions of large-scale industrial networks Jianxi Luo

  6. Best Practices and Tools for Large-scale Deployment of Renewable...

    Open Energy Info (EERE)

    Best Practices and Tools for Large-scale Deployment of Renewable Energy and Energy Efficiency Techniques Jump to: navigation, search Tool Summary LAUNCH TOOL Name: Best Practices...

  7. A Topological Framework for the Interactive Exploration of Large Scale Turbulent Combustion

    E-Print Network [OSTI]

    Bremer, Peer-Timo

    2010-01-01

    comparison of terascale combustion simulation data. Mathe-premixed hydrogen ?ames. Combustion and Flame, [7] J. L.of Large Scale Turbulent Combustion Peer-Timo Bremer 1 ,

  8. Parallel I/O Software Infrastructure for Large-Scale Systems

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Systems Parallel IO Software Infrastructure for Large-Scale Systems | Tags: Math & Computer Science Choudhary.png An illustration of how MPI---IO file domain alignment...

  9. In-situ sampling of a large-scale particle simulation for interactive...

    Office of Scientific and Technical Information (OSTI)

    random sampling of data from large scale particle simulations, such as the Roadrunner Universe MCsup 3 cosmological simulation, to be used for interactive post-analysis and...

  10. Extended tension leg platform design for offshore wind turbine systems

    E-Print Network [OSTI]

    Parker, Nicholas W. (Nicholas William)

    2007-01-01

    The rise of reliable wind energy application has become a primary alternative to conventional fossil fuel power plants in the United States and around the world. The feasibility of building large scale wind farms has become ...

  11. Wind Projects Providing Hope for Penn. Workers | Department of...

    Office of Environmental Management (EM)

    Projects Providing Hope for Penn. Workers Wind Projects Providing Hope for Penn. Workers March 8, 2010 - 11:28am Addthis Joshua DeLung The Recovery Act made three large-scale wind...

  12. Economic and Technical Feasibility Study of Utility-Scale Wind Generation for the New York Buffalo River and South Buffalo Brownfield Opportunity Areas

    SciTech Connect (OSTI)

    Roberts, J. O.; Mosey, G.

    2014-04-01

    Through the RE-Powering America's Land initiative, the economic and technical feasibility of utilizing contaminated lands in the Buffalo, New York, area for utility-scale wind development is explored. The study found that there is available land, electrical infrastructure, wind resource, and local interest to support a commercial wind project; however, economies of scale and local electrical markets may need further investigation before significant investment is made into developing a wind project at the Buffalo Reuse Authority site.

  13. On scale and magnitude of pressure build-up induced by large-scale geologic storage of CO2

    E-Print Network [OSTI]

    Zhou, Q.

    2012-01-01

    activities, such as oil production. Large-scale pressureannual volume of world oil production and the pore volumem 3 . In 2006, the world oil production was 4.3 km 3 (73.46

  14. A framework for delay emulation of large-scale internetworks 

    E-Print Network [OSTI]

    Venkata, Shravan Rangaraju

    2001-01-01

    Several network applications require access to a large number of geographically distributed machines for testing and debugging purposes. Typically, it is the case that either access is not available for so many machines, ...

  15. New Superconducting Magnet Will Lead to Next Generation of Wind...

    Energy Savers [EERE]

    DOE funded AML's design for a superconducting generator for large-scale, high-efficiency offshore wind turbines. AML worked with its partners, Emerson Electric Corporation, Creare...

  16. Two Facilities, One Goal: Advancing America's Wind Industry ...

    Broader source: Energy.gov (indexed) [DOE]

    the large, commercial scale turbines being developed by manufacturers for offshore wind farms. This facility, which opened last week, is equipped with 7.5-megawatt (MW) and...

  17. RICE UNIVERSITY Argos: Practical Base Stations for Large-scale

    E-Print Network [OSTI]

    Zhong, Lin

    , Thesis Committee: Lin Zhong, Chair Associate Professor Electrical and Computer Engineering Ashutosh Sabharwal Associate Professor Electrical and Computer Engineering Edward Knightly Professor Electrical-scale Beamforming by Clayton W. Shepard MU-MIMO theory predicts manyfold capacity gains by leveraging many antennas

  18. CgWind: A high-order accurate simulation tool for wind turbines and wind farms

    SciTech Connect (OSTI)

    Chand, K K; Henshaw, W D; Lundquist, K A; Singer, M A

    2010-02-22

    CgWind is a high-fidelity large eddy simulation (LES) tool designed to meet the modeling needs of wind turbine and wind park engineers. This tool combines several advanced computational technologies in order to model accurately the complex and dynamic nature of wind energy applications. The composite grid approach provides high-quality structured grids for the efficient implementation of high-order accurate discretizations of the incompressible Navier-Stokes equations. Composite grids also provide a natural mechanism for modeling bodies in relative motion and complex geometry. Advanced algorithms such as matrix-free multigrid, compact discretizations and approximate factorization will allow CgWind to perform highly resolved calculations efficiently on a wide class of computing resources. Also in development are nonlinear LES subgrid-scale models required to simulate the many interacting scales present in large wind turbine applications. This paper outlines our approach, the current status of CgWind and future development plans.

  19. Observations of the scale-dependent turbulence and evaluation of the flux-gradient relationship for sensible heat for a closed Douglas-Fir canopy in very weak wind conditions

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Vickers, D.; Thomas, C.

    2014-05-13

    Observations of the scale-dependent turbulent fluxes and variances above, within and beneath a tall closed Douglas-Fir canopy in very weak winds are examined. The daytime subcanopy vertical velocity spectra exhibit a double-peak structure with peaks at time scales of 0.8 s and 51.2 s. A double-peak structure is also observed in the daytime subcanopy heat flux cospectra. The daytime momentum flux cospectra inside the canopy and in the subcanopy are characterized by a relatively large cross-wind component, likely due to the extremely light and variable winds, such that the definition of a mean wind direction, and subsequent partitioning of themore »momentum flux into along- and cross-wind components, has little physical meaning. Positive values of both momentum flux components in the subcanopy contribute to upward transfer of momentum, consistent with the observed mean wind speed profile. In the canopy at night at the smallest resolved scales, we find relatively large momentum fluxes (compared to at larger scales), and increasing vertical velocity variance with decreasing time scale, consistent with very small eddies likely generated by wake shedding from the canopy elements that transport momentum but not heat. We find unusually large values of the velocity aspect ratio within the canopy, consistent with enhanced suppression of the horizontal wind components compared to the vertical by the canopy. The flux-gradient approach for sensible heat flux is found to be valid for the subcanopy and above-canopy layers when considered separately; however, single source approaches that ignore the canopy fail because they make the heat flux appear to be counter-gradient when in fact it is aligned with the local temperature gradient in both the subcanopy and above-canopy layers. Modeled sensible heat fluxes above dark warm closed canopies are likely underestimated using typical values of the Stanton number.« less

  20. Plasma turbulence and kinetic instabilities at ion scales in the expanding solar wind

    E-Print Network [OSTI]

    Hellinger, Petr; Landi, Simone; Verdini, Andrea; Franci, Luca; Travnicek, Pavel M

    2015-01-01

    The relationship between a decaying strong turbulence and kinetic instabilities in a slowly expanding plasma is investigated using two-dimensional (2-D) hybrid expanding box simulations. We impose an initial ambient magnetic field perpendicular to the simulation box, and we start with a spectrum of large-scale, linearly-polarized, random-phase Alfv\\'enic fluctuations which have energy equipartition between kinetic and magnetic fluctuations and vanishing correlation between the two fields. A turbulent cascade rapidly develops, magnetic field fluctuations exhibit a Kolmogorov-like power-law spectrum at large scales and a steeper spectrum at ion scales. The turbulent cascade leads to an overall anisotropic proton heating, protons are heated in the perpendicular direction, and, initially, also in the parallel direction. The imposed expansion leads to generation of a large parallel proton temperature anisotropy which is at later stages partly reduced by turbulence. The turbulent heating is not sufficient to overco...

  1. IMPLEMENTATION OF WIND TURBINE CONTROLLERS W.E.Leithead

    E-Print Network [OSTI]

    Duffy, Ken

    significantly reduce the power transients at controller start-up. The relation to anti-wind-up is noted. The standard commercial design of wind turbine is a horizontal-axis grid-connected up-wind machine of wind turbines, which are presently being developed, will include large-scale designs with a rating

  2. 66 APRIL | 2010 The FuTure oF Wind Turbine

    E-Print Network [OSTI]

    Kusiak, Andrew

    in the form of large-scale wind farms, wind energy cooperatives, wind turbines owned by indi- vidual investors66 APRIL | 2010 The FuTure oF Wind Turbine diagnosTics Wind energy is undergoing expansion, and multinational exploration of remote sites and offshore locations. Despite the in- creasing rated capacity

  3. Aalborg Universitet Transient Stability Assessment of Power System with Large Amount of Wind Power

    E-Print Network [OSTI]

    Bak, Claus Leth

    the transient stability. In Denmark, the onshore and offshore wind farms are connected to distribution system and transmission system respectively. The control and protection methodologies of onshore and offshore wind farms definitely affect the transient stability of power system. In this paper, the onshore and offshore wind farms

  4. Analysis of Wind Power and Load Data at Multiple Time Scales

    E-Print Network [OSTI]

    Coughlin, Katie

    2011-01-01

    Huei. 2005. Primer on Wind Power for Utility Applications.Wan, Yih-Huei. 2004. Wind Power Plant Behaviors: Analysesof Long-Term Wind Power Data. National Renewable Energy Lab

  5. A Multispacecraft Analysis of a Small-Scale Transient Entrained by Solar Wind Streams

    E-Print Network [OSTI]

    2009-01-01

    panels show IMPACT observations of solar wind proton speed (Entrained by Solar Wind Streams Figure 8 PLASTIC and IMPACTIMPACT package, are used in the present study. Near-Earth solar wind

  6. Analysis of Wind Power and Load Data at Multiple Time Scales

    E-Print Network [OSTI]

    Coughlin, Katie

    2011-01-01

    use of near-term wind power forecasts (GE 2008, CAISO 2007).partially controllable. Wind power can be forecast with someforecast will be based on some combination of the same-day wind

  7. European Wind Energy Conference & Exhibition EWEC 2003, Madrid, Spain. Forecasting of Regional Wind Generation by a Dynamic

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    European Wind Energy Conference & Exhibition EWEC 2003, Madrid, Spain. Forecasting of Regional Wind. Abstract-Short-term wind power forecasting is recognized nowadays as a major requirement for a secure and economic integration of wind power in a power system. In the case of large-scale integration, end users

  8. *Smith, J. A., 1999: Observations of wind, waves, and the mixed layer: the scaling of surface motion. In The Wind-Driven Air-Sea Interface, edited by M. L. Banner, pp. 231-238. Published

    E-Print Network [OSTI]

    Smith, Jerome A.

    *Smith, J. A., 1999: Observations of wind, waves, and the mixed layer: the scaling of surface motion. In The Wind-Driven Air-Sea Interface, edited by M. L. Banner, pp. 231-238. Published by University of New South Wales, Sydney, Australia, ISBN 0 7334 0586 X. Observations of wind, waves

  9. Multilevel method for modeling large-scale networks.

    SciTech Connect (OSTI)

    Safro, I. M. (Mathematics and Computer Science)

    2012-02-24

    Understanding the behavior of real complex networks is of great theoretical and practical significance. It includes developing accurate artificial models whose topological properties are similar to the real networks, generating the artificial networks at different scales under special conditions, investigating a network dynamics, reconstructing missing data, predicting network response, detecting anomalies and other tasks. Network generation, reconstruction, and prediction of its future topology are central issues of this field. In this project, we address the questions related to the understanding of the network modeling, investigating its structure and properties, and generating artificial networks. Most of the modern network generation methods are based either on various random graph models (reinforced by a set of properties such as power law distribution of node degrees, graph diameter, and number of triangles) or on the principle of replicating an existing model with elements of randomization such as R-MAT generator and Kronecker product modeling. Hierarchical models operate at different levels of network hierarchy but with the same finest elements of the network. However, in many cases the methods that include randomization and replication elements on the finest relationships between network nodes and modeling that addresses the problem of preserving a set of simplified properties do not fit accurately enough the real networks. Among the unsatisfactory features are numerically inadequate results, non-stability of algorithms on real (artificial) data, that have been tested on artificial (real) data, and incorrect behavior at different scales. One reason is that randomization and replication of existing structures can create conflicts between fine and coarse scales of the real network geometry. Moreover, the randomization and satisfying of some attribute at the same time can abolish those topological attributes that have been undefined or hidden from researchers. We propose to develop multilevel methods to model complex networks. The key point of the proposed strategy is that it will help to preserve part of the unknown structural attributes by guaranteeing the similar behavior of the real and artificial model on different scales.

  10. On the Evolution of Thermonuclear Flames on Large Scales

    E-Print Network [OSTI]

    Ju Zhang; O. E. Bronson Messer; Alexei M. Khokhlov; Tomasz Plewa

    2006-10-05

    The thermonuclear explosion of a massive white dwarf in a Type Ia supernova explosion is characterized by vastly disparate spatial and temporal scales. The extreme dynamic range inherent to the problem prevents the use of direct numerical simulation and forces modelers to resort to subgrid models to describe physical processes taking place on unresolved scales. We consider the evolution of a model thermonuclear flame in a constant gravitational field on a periodic domain. The gravitational acceleration is aligned with the overall direction of the flame propagation, making the flame surface subject to the Rayleigh-Taylor instability. The flame evolution is followed through an extended initial transient phase well into the steady-state regime. The properties of the evolution of flame surface are examined. We confirm the form of the governing equation of the evolution suggested by Khokhlov (1995). The mechanism of vorticity production and the interaction between vortices and the flame surface are discussed. The results of our investigation provide the bases for revising and extending previous subgrid-scale model.

  11. Large-scale MR fluid dampers: modeling, and dynamic performance considerations

    E-Print Network [OSTI]

    Spencer Jr., Billie F.

    , University of Notre Dame, Notre Dame, IN 46556, USA b Lord Corporation, 110 Lord Drive, Cary, NC 27511, USA c of its mechanical simplicity, high dynamic range, low power requirements, large force capacity an attractive means of protecting civil infrastructure systems against severe earthquake and wind loading

  12. Autonomous Science during Large-Scale Robotic David R. Thompson

    E-Print Network [OSTI]

    of geologic phenomena with a visible near-infrared spectrometer. We develop an approach to "sci- ence). Scientists can use these over-the-horizon modes to quickly characterize large areas and visit multiple geologic units between communications opportunities (Wettergreen et al., 2005; Cabrol et al., 2007

  13. Energy Modeling of Supercomputers and Large-Scale Scientific Applications

    E-Print Network [OSTI]

    Pakin, Scott

    include 1) the presentation of a practical, regression model that expresses energy consumption consumption, 2) a validation of the model's ability to describe the energy consumption of a few large needed for an application to reduce its energy consumption and an identification of the CPU frequency

  14. DOE/SNL-TTU scaled wind farm technology facility : research opportunities for study of turbine-turbine interaction.

    SciTech Connect (OSTI)

    Barone, Matthew Franklin; White, Jonathan

    2011-09-01

    The proposed DOE/Sandia Scaled Wind Farm Technology Facility (SWiFT) hosted by Texas Tech University at Reese Technology Center in Lubbock, TX, will provide a facility for experimental study of turbine-turbine interaction and complex wind farm aerodynamics. This document surveys the current status of wind turbine wake and turbine-turbine interaction research, identifying knowledge and data gaps that the proposed test site can potentially fill. A number of turbine layouts is proposed, allowing for up to ten turbines at the site.

  15. Investment Timing and Capacity Choice for Small-Scale Wind Power Under Uncertainty

    E-Print Network [OSTI]

    Fleten, Stein-Erik; Maribu, Karl Magnus

    2004-01-01

    A 20-year industry plan for small wind turbine tech- nology,has estimated that small wind turbines could contribute to 3

  16. Large Scale Test of Sensor Fingerprint Camera Identification Miroslav Goljan, Jessica Fridrich, and Toms Filler

    E-Print Network [OSTI]

    Fridrich, Jessica

    Large Scale Test of Sensor Fingerprint Camera Identification Miroslav Goljan, Jessica Fridrich This paper presents a large scale test of camera identification from sensor fingerprints. To overcome-line image sharing site. In our experiment, we tested over one million images spanning 6896 individual

  17. Harvesting Clean Energy How California Can Deploy Large-Scale Renewable

    E-Print Network [OSTI]

    Kammen, Daniel M.

    Harvesting Clean Energy How California Can Deploy Large-Scale Renewable Energy Projects Harvesting Clean Energy: How California Can Deploy Large-Scale Renewable Energy Projects on Appropriate acres of impaired lands in the Westlands Water District in the Central Valley may soon have

  18. Large-Scale Trends in the Evolution of Gene Structures within 11 Animal Genomes

    E-Print Network [OSTI]

    Yandell, Mark

    Large-Scale Trends in the Evolution of Gene Structures within 11 Animal Genomes Mark Yandell1,2,3¤a-source software library called CGL (for ``Comparative Genomics Library''). Our results demonstrate that change. Citation: Yandell M, Mungall CJ, Smith C, Prochnik S, Kaminker J, et al (2006) Large-scale trends

  19. Scheduling of large scale crude oil blending Felipe Diaz-Alvarado1, Francisco Trespalacios2,

    E-Print Network [OSTI]

    Grossmann, Ignacio E.

    Scheduling of large scale crude oil blending Felipe D´iaz-Alvarado1, Francisco Trespalacios2, 30 (4): 614-634. D´iaz-Alvarado, Trespalacios, Grossmann Scheduling of large scale crude oil blending, P. A Novel Priority-Slot Based Continuous-Time Formulation for Crude-Oil Scheduling Problems

  20. Towards Automatic Incorporation of Search engines into a Large-Scale Metasearch Engine

    E-Print Network [OSTI]

    Meng, Weiyi

    Towards Automatic Incorporation of Search engines into a Large-Scale Metasearch Engine Zonghuan Wu. of Computer Science Univ. of Illinois at Chicago yu@cs.uic.edu Abstract A metasearch engine supports unified access to multiple component search engines. To build a very large-scale metasearch engine that can

  1. Reconfiguration-Assisted Charging in Large-Scale Lithium-ion Battery Systems

    E-Print Network [OSTI]

    Reconfiguration-Assisted Charging in Large-Scale Lithium-ion Battery Systems Liang He1 , Linghe, TX, USA ABSTRACT Large-scale Lithium-ion batteries are widely adopted in many systems and heterogeneous discharging con- ditions, cells in the battery system may have differ- ent statuses

  2. Electronic Properties of Large-scale Graphene Films Chemical Vapor Synthesized on Nickel and on Copper

    E-Print Network [OSTI]

    Chen, Yong P.

    transport properties of graphene films grown on Ni and Cu. Sample Preparation The synthesis of graphene film1 Electronic Properties of Large-scale Graphene Films Chemical Vapor Synthesized on Nickel of large scale graphene films grown by chemical vapor synthesis on Ni and Cu, and then transferred to SiO2

  3. U.S. Energy Infrastructure Investment: Large-Scale Integrated Smart Grid

    E-Print Network [OSTI]

    U.S. Energy Infrastructure Investment: Large-Scale Integrated Smart Grid Solutions with High: LargeScale Integrated Smart Grid Solutions with High Penetration of Renewable Resources, Dispersed- ing electricity grid. Much attention is being given to smart grid development in the U.S. and around

  4. Monte Carlo Adaptive Technique for Sensitivity Analysis of a Large-scale Air Pollution Model

    E-Print Network [OSTI]

    Dimov, Ivan

    Monte Carlo Adaptive Technique for Sensitivity Analysis of a Large-scale Air Pollution Model Ivan of input parameters contribution into output variability of a large- scale air pollution model]. This model simulates the transport of air pollutants and has been developed by Dr. Z. Zlatev and his

  5. QA-Pagelet: Data Preparation Techniques for Large Scale Data Analysis of the Deep Web

    E-Print Network [OSTI]

    Liu, Ling

    1 QA-Pagelet: Data Preparation Techniques for Large Scale Data Analysis of the Deep Web James data preparation technique for large scale data analysis of the Deep Web. To support QA the Deep Web. Two unique features of the Thor framework are (1) the novel page clustering for grouping

  6. QA-Pagelet: Data Preparation Techniques for Large-Scale Data Analysis of the Deep Web

    E-Print Network [OSTI]

    Caverlee, James

    QA-Pagelet: Data Preparation Techniques for Large-Scale Data Analysis of the Deep Web James the QA-Pagelet as a fundamental data preparation technique for large-scale data analysis of the Deep Web-Pagelets from the Deep Web. Two unique features of the Thor framework are 1) the novel page clustering

  7. Experimental Investigation on Rapid Filling of a Large-Scale Pipeline

    E-Print Network [OSTI]

    Tijsseling, A.S.

    ; Unsteady flow; Two-phase flow; Air­water interface; Flow-regime transition. Introduction Rapid pipe filling experiments of the two-phase pressurized flow behavior during the rapid filling of a large-scale pipelineExperimental Investigation on Rapid Filling of a Large-Scale Pipeline Qingzhi Hou1 ; Arris S

  8. LETTER doi:10.1038/nature11727 Large-scale nanophotonic phased array

    E-Print Network [OSTI]

    Reif, Rafael

    and astronomy1 . The ability to generate arbi- trary radiation patterns with large-scale phased arrays has long been pursued. Although it is extremely expensive and cumbersome to deploy large-scale radiofrequency of the nanoantennas pre- cisely balanced in power and aligned in phase to generate a designed, sophisticated radiation

  9. Parallel domain decomposition for simulation of large-scale power grids

    E-Print Network [OSTI]

    Mohanram, Kartik

    of large-scale linear circuits such as power grids. DD techniques that use non-overlapping and overlap that with the proposed parallel DD framework, existing linear circuit simulators can be extended to handle large- scale can be solved independently in parallel using standard techniques for linear system analysis

  10. Passive scalar in a large-scale velocity field I. Kolokolov

    E-Print Network [OSTI]

    Lebedev, Vladimir

    Passive scalar in a large-scale velocity field I. Kolokolov Budker Institute of Nuclear Physics advection of a passive scalar (t,r) by an incompressible large-scale turbulent flow. In the framework of and for the passive scalar difference (r1) (r2) for separations r1 r2 lying in the convective interval are found

  11. Linear Algebraic Calculation of Green's function for Large-Scale Electronic Structure Theory

    E-Print Network [OSTI]

    Hoshi, Takeo

    Linear Algebraic Calculation of Green's function for Large-Scale Electronic Structure Theory R (Dated: March 2, 2006) A linear algebraic method named the shifted conjugate-orthogonal-conjugate-gradient method is introduced for large-scale electronic structure calculation. The method gives an iterative

  12. Type-Preserving Compilation for Large-Scale Optimizing Object-Oriented Compilers

    E-Print Network [OSTI]

    California at Berkeley, University of

    Type-Preserving Compilation for Large-Scale Optimizing Object-Oriented Compilers Juan Chen Chris polyvios@cs.umd.edu Abstract Type-preserving compilers translate well-typed source code, such as Java or C- mentation of type-preserving compilation in a complex, large-scale optimizing compiler. Compared to prior

  13. Platforms and Real Options in Large-Scale Engineering Konstantinos Kalligeros

    E-Print Network [OSTI]

    de Weck, Olivier L.

    Platforms and Real Options in Large-Scale Engineering Systems by Konstantinos Kalligeros Dipl teams to assess the value of real options in programs of large-scale, partially stan- dardized systems. A novel valuation process is introduced to value the developer's real options to choose among

  14. AMP: An Affinity-based Metadata Prefetching Scheme in Large-Scale Distributed Storage Systems

    E-Print Network [OSTI]

    Zhu, Yifeng

    1 AMP: An Affinity-based Metadata Prefetching Scheme in Large-Scale Distributed Storage Systems Lin significantly reduce access latency for I/O systems. In distributed storage systems, prefetching for metadata Prefetching (AMP) scheme is proposed for metadata servers in large-scale distributed storage systems

  15. Role of large-scale soil structure in organic carbon turnover: Evidence from California grassland soils

    E-Print Network [OSTI]

    Role of large-scale soil structure in organic carbon turnover: Evidence from California grassland soils Stephanie A. Ewing,1 Jonathan Sanderman,1 W. Troy Baisden,2 Yang Wang,3 and Ronald Amundson1 characterized the effect of large-scale (>20 mm) soil physical structure on the age and recalcitrance of soil

  16. Automated Data Verification in a Large-scale Citizen Science Project: a Case Study

    E-Print Network [OSTI]

    Wong, Weng-Keen

    Automated Data Verification in a Large-scale Citizen Science Project: a Case Study Jun Yu1 , Steve,jag73}@cornell.edu Abstract-- Although citizen science projects can engage a very large number with eBird, which is a broad-scale citizen science project to collect bird observations, has shown

  17. Phoenix Rebirth: Scalable MapReduce on a Large-Scale Shared-Memory System

    E-Print Network [OSTI]

    Kozyrakis, Christos

    Phoenix Rebirth: Scalable MapReduce on a Large-Scale Shared-Memory System Richard M. Yoo, Anthony for large-scale, shared-memory systems can be challenging. This work optimizes Phoenix, a MapReduce runtime for clusters and CMP systems [5]­[8]. This work focuses on Phoenix [5], a MapReduce imple- mentation for shared

  18. Disentangling the Multiple Sources of Large-Scale Variability in Australian Wintertime Precipitation

    E-Print Network [OSTI]

    Sherwood, Steven

    Precipitation PENELOPE MAHER AND STEVEN C. SHERWOOD Climate Change Research Centre and ARC Centre of Excellence received 25 October 2013, in final form 4 March 2014) ABSTRACT Precipitation is influenced by multiple large-scale natural processes. Many of these large-scale precipitation ``drivers'' are not independent

  19. Hurricane Activity and the Large-Scale Pattern of Spread of an Invasive Plant Species

    E-Print Network [OSTI]

    Cronin, James T.

    Hurricane Activity and the Large-Scale Pattern of Spread of an Invasive Plant Species Ganesh P of invasive species. However, the effects of large-scale disturbances, such as hurricanes and tropical storms. australis stands expanded in size by 6­35% per year. Based on tropical storm and hurricane activity over

  20. Airplanes Aloft as a Sensor Network for Wind Forecasting

    E-Print Network [OSTI]

    Horvitz, Eric

    Airplanes Aloft as a Sensor Network for Wind Forecasting Ashish Kapoor, Zachary Horvitz, Spencer for observing weather phenomena at a continental scale. We focus specifically on the problem of wind forecasting with the sensed winds. The experiments show the promise of using airplane in flight as a large-scale sensor

  1. Large Scale Geothermal Exchange System for Residential, Office and Retail

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QAsource History View NewTexas:Montezuma, Arizona: Energy ResourcesProject | Open Energy Information Large

  2. Large Scale Comparative Visualisation of Regulatory Networks with TRNDiff

    SciTech Connect (OSTI)

    Chua, Xin-Yi [QFAB Bioinformatics, Inst. for Molecular Biosciences, Brisbane (Austrialia); Buckingham, Lawrence [School of EECS, QUT, Brisbane (Australia); Hogan, James M. [School of EECS, QUT, Brisbane (Australia); Novichkov, Pavel [Lawrence Berkeley National Lab., CA (United States)

    2015-01-01

    The advent of Next Generation Sequencing (NGS) technologies has seen explosive growth in genomic datasets, and dense coverage of related organisms, supporting study of subtle, strain-specific variations as a determinant of function. Such data collections present fresh and complex challenges for bioinformatics, those of comparing models of complex relationships across hundreds and even thousands of sequences. Transcriptional Regulatory Network (TRN) structures document the influence of regulatory proteins called Transcription Factors (TFs) on associated Target Genes (TGs). TRNs are routinely inferred from model systems or iterative search, and analysis at these scales requires simultaneous displays of multiple networks well beyond those of existing network visualisation tools [1]. In this paper we describe TRNDiff, an open source system supporting the comparative analysis and visualization of TRNs (and similarly structured data) from many genomes, allowing rapid identification of functional variations within species. The approach is demonstrated through a small scale multiple TRN analysis of the Fur iron-uptake system of Yersinia, suggesting a number of candidate virulence factors; and through a larger study exploiting integration with the RegPrecise database (http://regprecise.lbl.gov; [2]) - a collection of hundreds of manually curated and predicted transcription factor regulons drawn from across the entire spectrum of prokaryotic organisms.

  3. Large Scale Comparative Visualisation of Regulatory Networks with TRNDiff

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Chua, Xin-Yi; Buckingham, Lawrence; Hogan, James M.; Novichkov, Pavel

    2015-06-01

    The advent of Next Generation Sequencing (NGS) technologies has seen explosive growth in genomic datasets, and dense coverage of related organisms, supporting study of subtle, strain-specific variations as a determinant of function. Such data collections present fresh and complex challenges for bioinformatics, those of comparing models of complex relationships across hundreds and even thousands of sequences. Transcriptional Regulatory Network (TRN) structures document the influence of regulatory proteins called Transcription Factors (TFs) on associated Target Genes (TGs). TRNs are routinely inferred from model systems or iterative search, and analysis at these scales requires simultaneous displays of multiple networks well beyond thosemore »of existing network visualisation tools [1]. In this paper we describe TRNDiff, an open source system supporting the comparative analysis and visualization of TRNs (and similarly structured data) from many genomes, allowing rapid identification of functional variations within species. The approach is demonstrated through a small scale multiple TRN analysis of the Fur iron-uptake system of Yersinia, suggesting a number of candidate virulence factors; and through a larger study exploiting integration with the RegPrecise database (http://regprecise.lbl.gov; [2]) - a collection of hundreds of manually curated and predicted transcription factor regulons drawn from across the entire spectrum of prokaryotic organisms.« less

  4. Ris-R-1000(EN) Cost Optimization of Wind Turbines for

    E-Print Network [OSTI]

    Risø-R-1000(EN) Cost Optimization of Wind Turbines for Large-scale Off-shore Wind Farms Peter contains a preliminary investigation of site specific design of off- shore wind turbines for a large off using a design tool for wind turbines that involve numerical optimization and aeroelastic calculations

  5. On the self-sustained nature of large-scale motions in turbulent Couette flow

    E-Print Network [OSTI]

    Rawat, Subhandu; Hwang, Yongyun; Rincon, François

    2015-01-01

    Large-scale motions in wall-bounded turbulent flows are frequently interpreted as resulting from an aggregation process of smaller-scale structures. Here, we explore the alternative possibility that such large-scale motions are themselves self-sustained and do not draw their energy from smaller-scale turbulent motions activated in buffer layers. To this end, it is first shown that large-scale motions in turbulent Couette flow at Re=2150 self-sustain even when active processes at smaller scales are artificially quenched by increasing the Smagorinsky constant Cs in large eddy simulations. These results are in agreement with earlier results on pressure driven turbulent channels. We further investigate the nature of the large-scale coherent motions by computing upper and lower-branch nonlinear steady solutions of the filtered (LES) equations with a Newton-Krylov solver,and find that they are connected by a saddle-node bifurcation at large values of Cs. Upper branch solutions for the filtered large scale motions a...

  6. Large Scale Power Suppression in a Multifield Landscape

    E-Print Network [OSTI]

    Blanco-Pillado, Jose J; Frazer, Jonathan; Sousa, Kepa

    2015-01-01

    Power suppression of the cosmic microwave background on the largest observable scales could provide valuable clues about the particle physics underlying inflation. Here we consider the prospect of power suppression in the context of the multifield landscape. Based on the assumption that our observable universe emerges from a tunnelling event and that the relevant features originate purely from inflationary dynamics, we find that the power spectrum not only contains information on single-field dynamics, but also places strong con- straints on all scalar fields present in the theory. We find that the simplest single-field models giving rise to power suppression do not generalise to multifield models in a straightforward way, as the resulting superhorizon evolution of the curvature perturbation tends to erase any power suppression present at horizon crossing. On the other hand, multifield effects do present a means of generating power suppression which to our knowledge has so far not been considered. We propose ...

  7. Large-Scale Molecular Dynamics Simulations for Highly Parallel Infrastructures

    E-Print Network [OSTI]

    Pazúriková, Jana

    2014-01-01

    Computational chemistry allows researchers to experiment in sillico: by running a computer simulations of a biological or chemical processes of interest. Molecular dynamics with molecular mechanics model of interactions simulates N-body problem of atoms$-$it computes movements of atoms according to Newtonian physics and empirical descriptions of atomic electrostatic interactions. These simulations require high performance computing resources, as evaluations within each step are computationally demanding and billions of steps are needed to reach interesting timescales. Current methods decompose the spatial domain of the problem and calculate on parallel/distributed infrastructures. Even the methods with the highest strong scaling hit the limit at half a million cores: they are not able to cut the time to result if provided with more processors. At the dawn of exascale computing with massively parallel computational resources, we want to increase the level of parallelism by incorporating parallel-in-time comput...

  8. DLFM library tools for large scale dynamic applications

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 Outreach Home Room NewsInformation Current HAB Packet Hanford Advisory Board6/23/2014DLFM library tools for large

  9. Large Scale Computing and Storage Requirements for Basic Energy Sciences:

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 Outreach Home Room NewsInformationJesse Bergkamp Graduate studentScienceLaboratory programTarget 2014 Large

  10. Sandia Energy - Large-Scale Computational Fluid Dynamics

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 Outreach Home RoomPreservation of Fe(II)Geothermal Energy &Water Power ProgramLarge Eddy Simulation

  11. Feasibility of Large-Scale Ocean CO2 Sequestration

    SciTech Connect (OSTI)

    Peter Brewer

    2008-08-31

    Scientific knowledge of natural clathrate hydrates has grown enormously over the past decade, with spectacular new findings of large exposures of complex hydrates on the sea floor, the development of new tools for examining the solid phase in situ, significant progress in modeling natural hydrate systems, and the discovery of exotic hydrates associated with sea floor venting of liquid CO{sub 2}. Major unresolved questions remain about the role of hydrates in response to climate change today, and correlations between the hydrate reservoir of Earth and the stable isotopic evidence of massive hydrate dissociation in the geologic past. The examination of hydrates as a possible energy resource is proceeding apace for the subpermafrost accumulations in the Arctic, but serious questions remain about the viability of marine hydrates as an economic resource. New and energetic explorations by nations such as India and China are quickly uncovering large hydrate findings on their continental shelves. In this report we detail research carried out in the period October 1, 2007 through September 30, 2008. The primary body of work is contained in a formal publication attached as Appendix 1 to this report. In brief we have surveyed the recent literature with respect to the natural occurrence of clathrate hydrates (with a special emphasis on methane hydrates), the tools used to investigate them and their potential as a new source of natural gas for energy production.

  12. Large-scale seismic signal analysis with Hadoop

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Addair, T. G.; Dodge, D. A.; Walter, W. R.; Ruppert, S. D.

    2014-05-01

    In seismology, waveform cross correlation has been used for years to produce high-precision hypocenter locations and for sensitive detectors. Because correlated seismograms generally are found only at small hypocenter separation distances, correlation detectors have historically been reserved for spotlight purposes. However, many regions have been found to produce large numbers of correlated seismograms, and there is growing interest in building next-generation pipelines that employ correlation as a core part of their operation. In an effort to better understand the distribution and behavior of correlated seismic events, we have cross correlated a global dataset consisting of over 300 million seismograms. Thismore »was done using a conventional distributed cluster, and required 42 days. In anticipation of processing much larger datasets, we have re-architected the system to run as a series of MapReduce jobs on a Hadoop cluster. In doing so we achieved a factor of 19 performance increase on a test dataset. We found that fundamental algorithmic transformations were required to achieve the maximum performance increase. Whereas in the original IO-bound implementation, we went to great lengths to minimize IO, in the Hadoop implementation where IO is cheap, we were able to greatly increase the parallelism of our algorithms by performing a tiered series of very fine-grained (highly parallelizable) transformations on the data. Each of these MapReduce jobs required reading and writing large amounts of data.« less

  13. Edit paper Methods for Large Scale Hydraulic Fracture Monitoring

    E-Print Network [OSTI]

    Ely, Gregory

    2013-01-01

    In this paper we propose computationally efficient and robust methods for estimating the moment tensor and location of micro-seismic event(s) for large search volumes. Our contribution is two-fold. First, we propose a novel joint-complexity measure, namely the sum of nuclear norms which while imposing sparsity on the number of fractures (locations) over a large spatial volume, also captures the rank-1 nature of the induced wavefield pattern. This wavefield pattern is modeled as the outer-product of the source signature with the amplitude pattern across the receivers from a seismic source. A rank-1 factorization of the estimated wavefield pattern at each location can therefore be used to estimate the seismic moment tensor using the knowledge of the array geometry. In contrast to existing work this approach allows us to drop any other assumption on the source signature. Second, we exploit the recently proposed first-order incremental projection algorithms for a fast and efficient implementation of the resulting...

  14. arXiv:0710.0763v1[astro-ph]3Oct2007 Small scale energy cascade of the solar wind turbulence

    E-Print Network [OSTI]

    Alexandrova, Olga

    arXiv:0710.0763v1[astro-ph]3Oct2007 Small scale energy cascade of the solar wind turbulence O depends neither on the energy injection nor on the energy dissipation processes. In the solar wind/CNR, Ponte P. Bucci, Cubo 33B, 87036 Rende (CS), Italy ABSTRACT Magnetic fluctuations in the solar wind

  15. Large-Scale Hybrid Dynamic Simulation Employing Field Measurements

    SciTech Connect (OSTI)

    Huang, Zhenyu; Guttromson, Ross T.; Hauer, John F.

    2004-06-30

    Simulation and measurements are two primary ways for power engineers to gain understanding of system behaviors and thus accomplish tasks in system planning and operation. Many well-developed simulation tools are available in today's market. On the other hand, large amount of measured data can be obtained from traditional SCADA systems and currently fast growing phasor networks. However, simulation and measurement are still two separate worlds. There is a need to combine the advantages of simulation and measurements. In view of this, this paper proposes the concept of hybrid dynamic simulation which opens up traditional simulation by providing entries for measurements. A method is presented to implement hybrid simulation with PSLF/PSDS. Test studies show the validity of the proposed hybrid simulation method. Applications of such hybrid simulation include system event playback, model validation, and software validation.

  16. Nonlinear modulation of the HI power spectrum on ultra-large scales. I

    E-Print Network [OSTI]

    Umeh, Obinna; Santos, Mario

    2015-01-01

    Intensity mapping of the neutral hydrogen brightness temperature promises to provide a three-dimensional view of the universe on very large scales. Nonlinear effects are typically thought to alter only the small-scale power, but we show how they can bias the extraction of cosmological information contained in the power spectrum on ultra-large scales. For linear perturbations to remain valid on large scales, we need to renormalize perturbations at higher order. In the case of intensity mapping, the second-order contribution to clustering from weak lensing dominates nonlinear contribution at high redshift. Renormalization modifies the mean brightness temperature and therefore the evolution bias. It also introduces a term that mimics white noise. These effects can influence forecasting analysis on ultra-large scales.

  17. Large Scale Power Suppression in a Multifield Landscape

    E-Print Network [OSTI]

    Jose J. Blanco-Pillado; Mafalda Dias; Jonathan Frazer; Kepa Sousa

    2015-03-25

    Power suppression of the cosmic microwave background on the largest observable scales could provide valuable clues about the particle physics underlying inflation. Here we consider the prospect of power suppression in the context of the multifield landscape. Based on the assumption that our observable universe emerges from a tunnelling event and that the relevant features originate purely from inflationary dynamics, we find that the power spectrum not only contains information on single-field dynamics, but also places strong con- straints on all scalar fields present in the theory. We find that the simplest single-field models giving rise to power suppression do not generalise to multifield models in a straightforward way, as the resulting superhorizon evolution of the curvature perturbation tends to erase any power suppression present at horizon crossing. On the other hand, multifield effects do present a means of generating power suppression which to our knowledge has so far not been considered. We propose a mechanism to illustrate this, which we dub flume inflation.

  18. On Soft Limits of Large-Scale Structure Correlation Functions

    E-Print Network [OSTI]

    Ido Ben-Dayan; Thomas Konstandin; Rafael A. Porto; Laura Sagunski

    2015-02-24

    We study soft limits of correlation functions for the density and velocity fields in the theory of structure formation. First, we re-derive the (resummed) consistency conditions at unequal times using the eikonal approximation. These are solely based on symmetry arguments and are therefore universal. Then, we explore the existence of equal-time relations in the soft limit which, on the other hand, depend on the interplay between soft and hard modes. We scrutinize two approaches in the literature: The time-flow formalism, and a background method where the soft mode is absorbed into a locally curved cosmology. The latter has been recently used to set up (angular averaged) `equal-time consistency relations'. We explicitly demonstrate that the time-flow relations and `equal-time consistency conditions' are only fulfilled at the linear level, and fail at next-to-leading order for an Einstein de-Sitter universe. While applied to the velocities both proposals break down beyond leading order, we find that the `equal-time consistency conditions' quantitatively approximates the perturbative results for the density contrast. Thus, we generalize the background method to properly incorporate the effect of curvature in the density and velocity fluctuations on short scales, and discuss the reasons behind this discrepancy. We conclude with a few comments on practical implementations and future directions.

  19. Single-field consistency relations of large scale structure

    SciTech Connect (OSTI)

    Creminelli, Paolo; Noreña, Jorge; Simonovi?, Marko; Vernizzi, Filippo E-mail: jorge.norena@icc.ub.edu E-mail: filippo.vernizzi@cea.fr

    2013-12-01

    We derive consistency relations for the late universe (CDM and ?CDM): relations between an n-point function of the density contrast ? and an (n+1)-point function in the limit in which one of the (n+1) momenta becomes much smaller than the others. These are based on the observation that a long mode, in single-field models of inflation, reduces to a diffeomorphism since its freezing during inflation all the way until the late universe, even when the long mode is inside the horizon (but out of the sound horizon). These results are derived in Newtonian gauge, at first and second order in the small momentum q of the long mode and they are valid non-perturbatively in the short-scale ?. In the non-relativistic limit our results match with [1]. These relations are a consequence of diffeomorphism invariance; they are not satisfied in the presence of extra degrees of freedom during inflation or violation of the Equivalence Principle (extra forces) in the late universe.

  20. Compression, Segmentation, and Modeling of Large-Scale Filamentary Volumetric Data

    E-Print Network [OSTI]

    Keyser, John

    Compression, Segmentation, and Modeling of Large-Scale Filamentary Volumetric Data Bruce H. Mc Department ABSTRACT We describe a method for processing large amounts of volumetric data collected from struc- tures extending over very large regions that prior volumetric rep- resentations have difficulty

  1. Method of Equivalencing for a Large Wind Power Plant with Multiple Turbine Representation: Preprint

    SciTech Connect (OSTI)

    Muljadi, E.; Pasupulati, S.; Ellis, A.; Kosterov, D.

    2008-07-01

    This paper focuses on our effort to develop an equivalent representation of a Wind Power Plant collector system for power system planning studies.

  2. Aquifer sensitivity assessment modeling at a large scale

    SciTech Connect (OSTI)

    Berg, R.C.; Abert, C.C. (Illinois State Geological Survey, Champaign, IL (United States))

    1994-03-01

    A 480 square-mile region within Will County, northeastern Illinois was used as a test region for an evaluation of the sensitivity of aquifers to contamination. An aquifer sensitivity model was developed using a Geographic Information System (GIS) with ARC/INFO software to overlay and combine several data layers. Many of the input data layers were developed using 2-dimensional surface modeling (Interactive Surface Modeling (ISM)) and 3-dimensional volume modeling (Geologic Modeling Program (GMP)) computer software. Most of the input data layers (drift thickness, thickness of sand and gravel, depth to first aquifer) were derived from interpolation of descriptive logs for water wells and engineering borings from their study area. A total of 2,984 logs were used to produce these maps. The components used for the authors' model are (1) depth to sand and gravel or bedrock, (2) thickness of the uppermost sand and gravel aquifer, (3) drift thickness, and (4) absence or presence of uppermost bedrock aquifer. The model is an improvement over many aquifer sensitivity models because it combines specific information on depth to the uppermost sand and gravel aquifer with information on the thickness of the uppermost sand and gravel aquifer. The manipulation of the source maps according to rules-based assumptions results in a colored aquifer sensitivity map for the Will County study area. This colored map differentiates 42 aquifer sensitivity map areas by using line patterns within colors. The county-scale model results in an aquifer sensitivity map that can be a useful tool for making land-use planning decisions regarding aquifer protection and management of groundwater resources.

  3. Testing coupled dark energy with large scale structure observation

    SciTech Connect (OSTI)

    Yang, Weiqiang; Xu, Lixin, E-mail: d11102004@mail.dlut.edu.cn, E-mail: lxxu@dlut.edu.cn [Institute of Theoretical Physics, School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian, 116024 (China)

    2014-08-01

    The coupling between the dark components provides a new approach to mitigate the coincidence problem of cosmological standard model. In this paper, dark energy is treated as a fluid with a constant equation of state, whose coupling with dark matter is Q-bar =3H?{sub x}?-bar {sub x}. In the frame of dark energy, we derive the evolution equations for the density and velocity perturbations. According to the Markov Chain Monte Carlo method, we constrain the model by currently available cosmic observations which include cosmic microwave background radiation, baryon acoustic oscillation, type Ia supernovae, and f?{sub 8}(z) data points from redshift-space distortion. The results show the interaction rate in ? regions: ?{sub x} = 0.00328{sub -0.00328-0.00328-0.00328}{sup +0.000736+0.00549+0.00816}, which means that the recently cosmic observations favor a small interaction rate which is up to the order of 10{sup -2}, meanwhile, the measurement of redshift-space distortion could rule out the large interaction rate in the ? region.

  4. Assessment of wind power predictability as a decision factor in the investment phase of wind farms

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    the point of view of a producer participating in the day-ahead electricity market, lack of predictability price settlement mechanism will remain the same. Keywords: Wind power resource assessment, Wind power GW by 2020 according to EWEA projections (see [1]). Such large-scale integration of wind energy

  5. A Large Scale Double Beta and Dark Matter Experiment: GENIUS

    E-Print Network [OSTI]

    J. Hellmig; H. V. Klapdor-Kleingrothaus

    1998-01-21

    The recent results from the HEIDELBERG-MOSCOW experiment have demonstrated the large potential of double beta decay to search for new physics beyond the Standard Model. To increase by a major step the present sensitivity for double beta decay and dark matter search much bigger source strengths and much lower backgrounds are needed than used in experiments under operation at present or under construction. We present here a study of a project proposed recently, which would operate one ton of 'naked' enriched GErmanium-detectors in liquid NItrogen as shielding in an Underground Setup (GENIUS). It improves the sensitivity to neutrino masses to 0.01 eV. A ten ton version would probe neutrino masses even down to 10^-3 eV. The first version would allow to test the atmospheric neutrino problem, the second at least part of the solar neutrino problem. Both versions would allow in addition significant contributions to testing several classes of GUT models. These are especially tests of R-parity breaking supersymmetry models, leptoquark masses and mechanism and right-handed W-boson masses comparable to LHC. The second issue of the experiment is the search for dark matter in the universe. The entire MSSM parameter space for prediction of neutralinos as dark matter particles could be covered already in a first step of the full experiment - with the same purity requirements but using only 100 kg of 76Ge or even of natural Ge - making the experiment competitive to LHC in the search for supersymmetry. The layout of the proposed experiment is discussed and the shielding and purity requirements are studied using GEANT Monte Carlo simulations. As a demonstration of the feasibility of the experiment first results of operating a 'naked' Ge detector in liquid nitrogen are presented.

  6. Method for large-scale fabrication of atomic-scale structures on material surfaces using surface vacancies

    DOE Patents [OSTI]

    Lim, Chong Wee (Urbana, IL); Ohmori, Kenji (Urbana, IL); Petrov, Ivan Georgiev (Champaign, IL); Greene, Joseph E. (Champaign, IL)

    2004-07-13

    A method for forming atomic-scale structures on a surface of a substrate on a large-scale includes creating a predetermined amount of surface vacancies on the surface of the substrate by removing an amount of atoms on the surface of the material corresponding to the predetermined amount of the surface vacancies. Once the surface vacancies have been created, atoms of a desired structure material are deposited on the surface of the substrate to enable the surface vacancies and the atoms of the structure material to interact. The interaction causes the atoms of the structure material to form the atomic-scale structures.

  7. Tracking large tabular icebergs using the SeaWinds Ku-band microwave scatterometer

    E-Print Network [OSTI]

    Long, David G.

    . Originally designed to measure wind speed and direction over the ocean, SeaWinds is a microwave scatterometer. For instance, iceberg positions affect shipping lanes, outline ocean currents, and influence biological. Optical sensors produce high-resolution images but are unable to penetrate cloud cover and are dependent

  8. The role of large-scale, extratropical dynamics in climate change

    SciTech Connect (OSTI)

    Shepherd, T.G. [ed.

    1994-02-01

    The climate modeling community has focused recently on improving our understanding of certain processes, such as cloud feedbacks and ocean circulation, that are deemed critical to climate-change prediction. Although attention to such processes is warranted, emphasis on these areas has diminished a general appreciation of the role played by the large-scale dynamics of the extratropical atmosphere. Lack of interest in extratropical dynamics may reflect the assumption that these dynamical processes are a non-problem as far as climate modeling is concerned, since general circulation models (GCMs) calculate motions on this scale from first principles. Nevertheless, serious shortcomings in our ability to understand and simulate large-scale dynamics exist. Partly due to a paucity of standard GCM diagnostic calculations of large-scale motions and their transports of heat, momentum, potential vorticity, and moisture, a comprehensive understanding of the role of large-scale dynamics in GCM climate simulations has not been developed. Uncertainties remain in our understanding and simulation of large-scale extratropical dynamics and their interaction with other climatic processes, such as cloud feedbacks, large-scale ocean circulation, moist convection, air-sea interaction and land-surface processes. To address some of these issues, the 17th Stanstead Seminar was convened at Bishop`s University in Lennoxville, Quebec. The purpose of the Seminar was to promote discussion of the role of large-scale extratropical dynamics in global climate change. Abstracts of the talks are included in this volume. On the basis of these talks, several key issues emerged concerning large-scale extratropical dynamics and their climatic role. Individual records are indexed separately for the database.

  9. Fixed Low-Order Controller Design and H Optimization for Large-Scale

    E-Print Network [OSTI]

    Overton, Michael L.

    fuel cell system (Wang and Fixed Low-Order Controller Design and H Optimization for Large-Scale Dynamical Systems Tim Mitchell maximizer of the associated transfer function. Our controller design code uses nonsmooth optimization

  10. Metal Catalyzed sp2 Bonded Carbon - Large-scale Graphene Synthesis...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Metal Catalyzed sp2 Bonded Carbon - Large-scale Graphene Synthesis and Beyond December 1, 2009 at 3pm36-428 Peter Sutter Center for Functional Nanomaterials sutter abstract:...

  11. LARGE SCALE PERMEABILITY TEST OF THE GRANITE IN THE STRIPA MINE AND THERMAL CONDUCTIVITY TEST

    E-Print Network [OSTI]

    Lundstrom, L.

    2011-01-01

    No.2 LARGE SCALE PERMEABILITY TEST OF THE GRANITE' IN THEMINE AND, THERMAL CONDUCTIVITY TEST Lars Lundstrom and HakanSUMMARY REPORT Background TEST SITE Layout of test places

  12. Modeling and Analysis of Large-Scale On-Chip Interconnects 

    E-Print Network [OSTI]

    Feng, Zhuo

    2010-07-14

    dimensional process-voltage-temperature (PVT) variations demand much more modeling and analysis efforts than ever before, while the analysis of large scale on-chip interconnects that requires solving tens of millions of unknowns imposes great challenges...

  13. Partition-of-unity finite-element method for large scale quantum...

    Office of Scientific and Technical Information (OSTI)

    can be investigated by such accurate, quantum mechanical means. The current state of the art for large-scale quantum simulations is the planewave (PW) method, as implemented in now...

  14. Programmable window : a large-scale transparent electronic display using SPD film

    E-Print Network [OSTI]

    Ramos, Martin (Ramos Rizo-Patron)

    2004-01-01

    This research demonstrates that Suspended Particle Device (SPD) film is a viable option for the development of large-scale transparent display systems. The thesis analyzes the SPD film from an architectural display application ...

  15. Large-Scale CAD Model Visualization on a Scalable Shared-Memory Architecture

    E-Print Network [OSTI]

    Wald, Ingo

    Boeing 777 air- liner. 1 Introduction Computer Aided Design (CAD) has practically be- come ubiquitous in large-scale manufacturing are potential overlaps of assembly parts, as well as the difficulty in prop

  16. Large-Scale Simulation of Neural Networks with Biophysically Accurate Models on Graphics Processors 

    E-Print Network [OSTI]

    Wang, Mingchao

    2012-07-16

    Efficient simulation of large-scale mammalian brain models provides a crucial computational means for understanding complex brain functions and neuronal dynamics. However, such tasks are hindered by significant computational complexities...

  17. Statistical and Directable Methods for Large-Scale Rigid Body Simulation 

    E-Print Network [OSTI]

    Hsu, Shu-Wei

    2013-05-07

    This dissertation describes several techniques to improve performance and controllability of large-scale rigid body simulations. We first describe a statistical simulation method that replaces certain stages of rigid body simulation with a...

  18. Model-constrained optimization methods for reduction of parameterized large-scale systems

    E-Print Network [OSTI]

    Bui-Thanh, Tan

    2007-01-01

    Most model reduction techniques employ a projection framework that utilizes a reduced-space basis. The basis is usually formed as the span of a set of solutions of the large-scale system, which are computed for selected ...

  19. Model-Constrained Optimization Methods for Reduction of Parameterized Large-Scale Systems

    E-Print Network [OSTI]

    Tan, Bui-Thanh

    Most model reduction techniques employ a projection framework that utilizes a reduced-space basis. The basis is usually formed as the span of a set of solutions of the large-scale system, which are computed for selected ...

  20. Membraneless hydrogen bromine laminar flow battery for large-scale energy storage

    E-Print Network [OSTI]

    Braff, William Allan

    2014-01-01

    Electrochemical energy storage systems have been considered for a range of potential large-scale energy storage applications. These applications vary widely, both in the order of magnitude of energy storage that is required ...

  1. Large Scale Performance Measurement of Content-Based Automated Image-Orientation Detection

    E-Print Network [OSTI]

    Tomkins, Andrew

    Large Scale Performance Measurement of Content-Based Automated Image-Orientation Detection Abstract (sepia toned), contains reflections in water, and contains few markers. Row 4: If deeper information

  2. Fast kernel spectral clustering based on incomplete Cholesky factorization for large scale data analysis

    E-Print Network [OSTI]

    Arenberg 10, B-3001 Leuven, Belgium Abstract A fast spectral clustering algorithm, suitable for large scale´ak) #12;1. Introduction1 Clustering algorithms comprise unsupervised, explanatory data mining tech-2

  3. LARGE-SCALE UNSTEADINESS IN A TWO-DIMENSIONAL DIFFUSER: NUMERICAL STUDY TOWARD ACTIVE SEPARATION CONTROL

    E-Print Network [OSTI]

    Colonius, Tim

    of Technology, Pasadena, California 91125 ABSTRACT We develop a reduced order model for large-scale unsteadiness mass injection can pinch off vortices with a smaller size; accordingly, their convective velocity

  4. Comparison of the effects in the rock mass of large-scale chemical...

    Office of Scientific and Technical Information (OSTI)

    Comparison of the effects in the rock mass of large-scale chemical and nuclear explosions. Final technical report, June 9, 1994--October 9, 1994 Citation Details In-Document Search...

  5. Efficient Nonlinear Optimization with Rigorous Models for Large Scale Industrial Chemical Processes 

    E-Print Network [OSTI]

    Zhu, Yu

    2011-08-08

    of Department, Michael Pishko May 2011 Major Subject: Chemical Engineering iii ABSTRACT Efficient Nonlinear Optimization with Rigorous Models for Large Scale Industrial Chemical Processes. (May 2011) Yu Zhu, B.S., Zhejiang University; M.S., Zhejiang... . . . . . . . . . . . . . . . . . . . . . . . . . . 1 A. Nonlinear Optimization with Rigorous Large Scale Models 1 B. Chemical Applications of Nonlinear Optimization . . . . . 2 1. Design under Uncertainty . . . . . . . . . . . . . . . . 3 2. Optimal Operations with Steady State Models . . . . 4...

  6. Energy Storage and Reactive Power Compensator in a Large Wind Farm: Preprint

    SciTech Connect (OSTI)

    Muljadi, E.; Butterfield, C. P.; Yinger, R.; Romanowitz, H.

    2003-10-01

    The size of wind farm power systems is increasing, and so is the number of wind farms contributing to the power systems network. The size of wind turbines is also increasing--from less than 1 MW a few years ago to the 2- to 3-MW machines being installed today and the 5-MW machines under development. The interaction of the wind farm, energy storage, reactive power compensation, and the power system network is being investigated. Because the loads and the wind farms' output fluctuate during the day, the use of energy storage and reactive power compensation is ideal for the power system network. Energy storage and reactive power compensation can minimize real/reactive power imbalances that can affect the surrounding power system. In this paper, we will show how the contribution of wind farms affects the power distribution network and how the power distribution network, energy storage, and reactive power compensation interact when the wind changes. We will also investigate the size of the components in relation to each other and to the power system.

  7. Large-Scale Software Unit Testing on the Grid Yaohang Li, 2

    E-Print Network [OSTI]

    Li, Yaohang

    Large-Scale Software Unit Testing on the Grid 1 Yaohang Li, 2 Tao Dong, 3 Xinyu Zhang, 4 Yongduan-scale and cost-efficient computational grid resources as a software testing test bed to support automated software unit test in a complicated system. Within this test framework, a dynamic bag-of-tasks model

  8. Distinct large-scale turbulent-laminar states in transitional pipe flow

    E-Print Network [OSTI]

    Barkley, Dwight

    ) When fluid flows through a channel, pipe, or duct, there are two basic forms of motion: smooth laminarDistinct large-scale turbulent-laminar states in transitional pipe flow David Moxey1 and Dwight alternat- ing turbulent-laminar flow states on long length scales in subcri- tical shear flows (12

  9. Environmental impacts of large-scale grid-connected ground-mounted PV installations

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Environmental impacts of large-scale grid-connected ground-mounted PV installations Antoine Beylota-scale ground-mounted PV installations by considering a life-cycle approach. The methodology is based. Mobile PV installations with dual-axis trackers show the largest impact potential on ecosystem quality

  10. A NEW APPROACH TO MODELING LARGE-SCALE ALTERNATIVE FUEL AND VEHICLE TRANSITIONS

    E-Print Network [OSTI]

    Lin, C.-Y. Cynthia

    counter-intuitive dynamic: high energy prices can discourage wide scale adoption of alternative fueled 1 A NEW APPROACH TO MODELING LARGE-SCALE ALTERNATIVE FUEL AND VEHICLE TRANSITIONS by Joel to alternative fuels and vehicles will be challenging. New modeling approaches are necessary to supplement

  11. Domain Controlled Architecture A New Approach for Large Scale Software Integrated Automotive Systems

    E-Print Network [OSTI]

    Kühnhauser, Winfried

    Domain Controlled Architecture A New Approach for Large Scale Software Integrated Automotive Scale Software Integration, LSSI, Automotive Real Time, Multi-core, Many-core, Embedded Automo- tive mobility domain. The automotive in- dustry is confronted with a rising system complexity and several

  12. Summary of Conclusions and Recommendations Drawn from the DeepCWind Scaled Floating Offshore Wind System Test Campaign: Preprint

    SciTech Connect (OSTI)

    Robertson, A. N.; Jonkman, J. M.; Masciola, M. D.; Molta, P.; Goupee, A. J.; Coulling, A. J.; Prowell, I.; Browning, J.

    2013-07-01

    The DeepCwind consortium is a group of universities, national labs, and companies funded under a research initiative by the U.S. Department of Energy (DOE) to support the research and development of floating offshore wind power. The two main objectives of the project are to better understand the complex dynamic behavior of floating offshore wind systems and to create experimental data for use in validating the tools used in modeling these systems. In support of these objectives, the DeepCwind consortium conducted a model test campaign in 2011 of three generic floating wind systems, a tension-leg platform (TLP), a spar-buoy (spar), and a semisubmersible (semi). Each of the three platforms was designed to support a 1/50th-scale model of a 5 MW wind turbine and was tested under a variety of wind/wave conditions. The focus of this paper is to summarize the work done by consortium members in analyzing the data obtained from the test campaign and its use for validating the offshore wind modeling tool, FAST.

  13. Impact of Increasing Distributed Wind Power and Wind Turbine Siting on Rural Distribution Feeder Voltage Profiles: Preprint

    SciTech Connect (OSTI)

    Allen, A.; Zhang, Y. C.; Hodge, B. M.

    2013-09-01

    Many favorable wind energy resources in North America are located in remote locations without direct access to the transmission grid. Building transmission lines to connect remotely-located wind power plants to large load centers has become a barrier to increasing wind power penetration in North America. By connecting utility-sized megawatt-scale wind turbines to the distribution system, wind power supplied to consumers could be increased greatly. However, the impact of including megawatt-scale wind turbines on distribution feeders needs to be studied. The work presented here examined the impact that siting and power output of megawatt-scale wind turbines have on distribution feeder voltage. This is the start of work to present a general guide to megawatt-scale wind turbine impact on the distribution feeder and finding the amount of wind power that can be added without adversely impacting the distribution feeder operation, reliability, and power quality.

  14. Nuclear EMP simulation for large-scale urban environments. FDTD for electrically large problems.

    SciTech Connect (OSTI)

    Smith, William S.; Bull, Jeffrey S.; Wilcox, Trevor; Bos, Randall J.; Shao, Xuan-Min; Goorley, John T.; Costigan, Keeley R.

    2012-08-13

    In case of a terrorist nuclear attack in a metropolitan area, EMP measurement could provide: (1) a prompt confirmation of the nature of the explosion (chemical or nuclear) for emergency response; and (2) and characterization parameters of the device (reaction history, yield) for technical forensics. However, urban environment could affect the fidelity of the prompt EMP measurement (as well as all other types of prompt measurement): (1) Nuclear EMP wavefront would no longer be coherent, due to incoherent production, attenuation, and propagation of gamma and electrons; and (2) EMP propagation from source region outward would undergo complicated transmission, reflection, and diffraction processes. EMP simulation for electrically-large urban environment: (1) Coupled MCNP/FDTD (Finite-difference time domain Maxwell solver) approach; and (2) FDTD tends to be limited to problems that are not 'too' large compared to the wavelengths of interest because of numerical dispersion and anisotropy. We use a higher-order low-dispersion, isotropic FDTD algorithm for EMP propagation.

  15. Architecture for a large-scale ion-trap quantum computer

    E-Print Network [OSTI]

    Monroe, Christopher

    Architecture for a large-scale ion-trap quantum computer D. Kielpinski*, C. Monroe & D. J. Wineland ........................................................................................................................................................................................................................... Among the numerous types of architecture being explored for quantum computers are systems utilizing ion proposed a `quantum charge-coupled device' (QCCD) architecture consisting of a large number

  16. Copyright 2014 IEEE. Reprinted, with permission from: CERTS Microgrid Demonstration With Large-Scale Energy

    E-Print Network [OSTI]

    Copyright © 2014 IEEE. Reprinted, with permission from: CERTS Microgrid Demonstration With Large GRID, VOL. 5, NO. 2, MARCH 2014 937 CERTS Microgrid Demonstration With Large-Scale Energy Storage (CERTS) Microgrid concept captures the emerging po- tential of Distributed Energy Resource (DER) using

  17. Development of Large Scale High Performance Applications with a Parallelizing Compiler

    E-Print Network [OSTI]

    Vlad, Gregorio

    Development of Large Scale High Performance Applications with a Parallelizing Compiler B. DI parallel computations, and lack of robustness of parallelizing HPF compilers in handling large sized codes directives, into explicitly parallel code, by means of parallelizing compilers. This method is not only

  18. PARAFAC algorithms for large-scale problems Anh Huy Phan a,, Andrzej Cichocki b

    E-Print Network [OSTI]

    Cichocki, Andrzej

    PARAFAC algorithms for large-scale problems Anh Huy Phan a,Ã, Andrzej Cichocki b a Lab for Advanced a multidimensional data. Most of the existing algorithms for the PARAFAC, especially the alternating least squares (ALS) algorithm need to compute Khatri­Rao products of tall factors and multiplication of large

  19. Application and Mode Establishment of Asset-backed Securitization in Existing Large-scale Public Building Retrofit Financing in China 

    E-Print Network [OSTI]

    Sun, J.; Wu, Y.; Dai, Z.; Hao, Y.

    2006-01-01

    to reconstruct existing large-scale public buildings for large-scale public buildings having the characteristics of high-energy consumption and low-energy efficiency. Existing building retrofit is a system engineering involving technology, policy and management...

  20. Large-Scale Renewable Energy Guide: Developing Renewable Energy Projects Larger Than 10 MWs at Federal Facilities

    Broader source: Energy.gov [DOE]

    The Large-Scale Renewable Energy Guide: Developing Renewable Energy Projects Larger Than 10 MWs at Federal Facilities provides best practices and other helpful guidance for federal agencies developing large-scale renewable energy projects.

  1. Simultaneous effect of modified gravity and primordial non-Gaussianity in large scale structure observations

    SciTech Connect (OSTI)

    Mirzatuny, Nareg; Khosravi, Shahram; Baghram, Shant; Moshafi, Hossein E-mail: khosravi@mail.ipm.ir E-mail: hosseinmoshafi@iasbs.ac.ir

    2014-01-01

    In this work we study the simultaneous effect of primordial non-Gaussianity and the modification of the gravity in f(R) framework on large scale structure observations. We show that non-Gaussianity and modified gravity introduce a scale dependent bias and growth rate functions. The deviation from ?CDM in the case of primordial non-Gaussian models is in large scales, while the growth rate deviates from ?CDM in small scales for modified gravity theories. We show that the redshift space distortion can be used to distinguish positive and negative f{sub NL} in standard background, while in f(R) theories they are not easily distinguishable. The galaxy power spectrum is generally enhanced in presence of non-Gaussianity and modified gravity. We also obtain the scale dependence of this enhancement. Finally we define galaxy growth rate and galaxy growth rate bias as new observational parameters to constrain cosmology.

  2. Measuring and tuning energy efficiency on large scale high performance computing platforms.

    SciTech Connect (OSTI)

    Laros, James H., III

    2011-08-01

    Recognition of the importance of power in the field of High Performance Computing, whether it be as an obstacle, expense or design consideration, has never been greater and more pervasive. While research has been conducted on many related aspects, there is a stark absence of work focused on large scale High Performance Computing. Part of the reason is the lack of measurement capability currently available on small or large platforms. Typically, research is conducted using coarse methods of measurement such as inserting a power meter between the power source and the platform, or fine grained measurements using custom instrumented boards (with obvious limitations in scale). To collect the measurements necessary to analyze real scientific computing applications at large scale, an in-situ measurement capability must exist on a large scale capability class platform. In response to this challenge, we exploit the unique power measurement capabilities of the Cray XT architecture to gain an understanding of power use and the effects of tuning. We apply these capabilities at the operating system level by deterministically halting cores when idle. At the application level, we gain an understanding of the power requirements of a range of important DOE/NNSA production scientific computing applications running at large scale (thousands of nodes), while simultaneously collecting current and voltage measurements on the hosting nodes. We examine the effects of both CPU and network bandwidth tuning and demonstrate energy savings opportunities of up to 39% with little or no impact on run-time performance. Capturing scale effects in our experimental results was key. Our results provide strong evidence that next generation large-scale platforms should not only approach CPU frequency scaling differently, but could also benefit from the capability to tune other platform components, such as the network, to achieve energy efficient performance.

  3. Role of the Gulf Stream and KuroshioOyashio Systems in Large-Scale AtmosphereOcean Interaction: A Review

    E-Print Network [OSTI]

    Qiu, Bo

    , Paris, France & Department of Earth and Planetary Science, University of Tokyo, Tokyo, and RIGC, Kuroshio, Oyashio, and their extensions) is reviewed with an emphasis on their role in basin-scale climate in these regions. Low-frequency SST variability is primarily driven by basin-scale wind stress curl variability via

  4. Constraining ultra large-scale cosmology with multiple tracers in optical and radio surveys

    E-Print Network [OSTI]

    Alonso, David

    2015-01-01

    Multiple tracers of the cosmic density field, with different bias, number and luminosity evolution, can be used to measure the large-scale properties of the Universe. We show how an optimal combination of tracers can be used to detect general-relativistic effects in the observed density of sources. We forecast for the detectability of these effects, as well as measurements of primordial non-Gaussianity and large-scale lensing magnification with current and upcoming large-scale structure experiments. In particular we quantify the significance of these detections in the short term with experiments such as the Dark Energy Survey (DES), and in the long term with the Large Synoptic Survey Telescope (LSST) and the Square Kilometre Array (SKA). We review the main observational challenges that must be overcome to carry out these measurements.

  5. A Minimal Model for Large-scale Epitaxial Growth Kinetics of Graphene

    E-Print Network [OSTI]

    Jiang, Huijun

    2015-01-01

    Epitaxial growth via chemical vapor deposition is considered to be the most promising way towards synthesizing large area graphene with high quality. However, it remains a big theoretical challenge to reveal growth kinetics with atomically energetic and large-scale spatial information included. Here, we propose a minimal kinetic Monte Carlo model to address such an issue on an active catalyst surface with graphene/substrate lattice mismatch, which facilitates us to perform large scale simulations of the growth kinetics over two dimensional surface with growth fronts of complex shapes. A geometry-determined large-scale growth mechanism is revealed, where the rate-dominating event is found to be $C_{1}$-attachment for concave growth front segments and $C_{5}$-attachment for others. This growth mechanism leads to an interesting time-resolved growth behavior which is well consistent with that observed in a recent scanning tunneling microscopy experiment.

  6. A Systematic Approach to the Design of a Large Scale Detritiation System for Controlled Thermonuclear Fusion Experiments

    E-Print Network [OSTI]

    A Systematic Approach to the Design of a Large Scale Detritiation System for Controlled Thermonuclear Fusion Experiments

  7. Wind/Hybrid Electricity Applications

    SciTech Connect (OSTI)

    McDaniel, Lori

    2001-03-31

    Wind energy is widely recognized as the most efficient and cost effective form of new renewable energy available in the Midwest. New utility-scale wind farms (arrays of large turbines in high wind areas producing sufficient energy to serve thousands of homes) rival the cost of building new conventional forms of combustion energy plants, gas, diesel and coal power plants. Wind energy is not subject to the inflationary cost of fossil fuels. Wind energy can also be very attractive to residential and commercial electric customers in high wind areas who would like to be more self-sufficient for their energy needs. And wind energy is friendly to the environment at a time when there is increasing concern about pollution and climate change. However, wind energy is an intermittent source of power. Most wind turbines start producing small amounts of electricity at about 8-10 mph (4 meters per second) of wind speed. The turbine does not reach its rated output until the wind reaches about 26-28 mph (12 m/s). So what do you do for power when the output of the wind turbine is not sufficient to meet the demand for energy? This paper will discuss wind hybrid technology options that mix wind with other power sources and storage devices to help solve this problem. This will be done on a variety of scales on the impact of wind energy on the utility system as a whole, and on the commercial and small-scale residential applications. The average cost and cost-benefit of each application along with references to manufacturers will be given. Emerging technologies that promise to shape the future of renewable energy will be explored as well.

  8. A membrane-free lithium/polysulfide semi-liquid battery for large-scale energy storage

    E-Print Network [OSTI]

    Cui, Yi

    A membrane-free lithium/polysulfide semi-liquid battery for large-scale energy storage Yuan Yang,a Guangyuan Zhengb and Yi Cui*ac Large-scale energy storage represents a key challenge for renewable energy develop a new lithium/ polysulfide (Li/PS) semi-liquid battery for large-scale energy storage

  9. Large-scale eddies and their role in entrainment in turbulent jets and wakes Jimmy Philip and Ivan Marusic

    E-Print Network [OSTI]

    Marusic, Ivan

    Large-scale eddies and their role in entrainment in turbulent jets and wakes Jimmy Philip and Ivan. Fluids 24, 086101 (2012) The influence of large-scale structures on entrainment in a decelerating://pof.aip.org/about/rights_and_permissions #12;PHYSICS OF FLUIDS 24, 055108 (2012) Large-scale eddies and their role in entrainment in turbulent

  10. Frozen-in Fractals All Around: Inferring the Large Scale Effects of Small-Scale Magnetic Structure

    E-Print Network [OSTI]

    McAteer, R T James

    2015-01-01

    The large-scale structure of the magnetic field in the solar corona provides the energy to power large-scale solar eruptive events. Our physical understanding of this structure, and hence our ability to predict these events, is limited by the type of data currently available. It is shown that the multifractal spectrum is a powerful tool to study this structure, by providing a physical connection between the details of photospheric magnetic gradients and current density at all size scales. This uses concepts associated with geometric measure theory and the theory of weakly differentiable functions to compare Amp\\`{e}re's law to the wavelet-transform modulus maximum method. The H\\"{o}lder exponent provides a direct measure of the rate of change of current density across spatial size scales. As this measure is independent of many features of the data (pixel resolution, data size, data type, presence of quiet-Sun data), it provides a unique approach to studying magnetic-field complexity and hence a potentially po...

  11. Aalborg Universitet Wind Farm Structures' Impact on Harmonic Emission and Grid Interaction

    E-Print Network [OSTI]

    Bak, Claus Leth

    characteristic is investigated in this paper. The largest wind farms in the world, Horns Rev 2 Offshore Wind Farm turbines (WTs) with full-scale converters used in large offshore wind farms (OWFs) is increasing into consideration, the largest in the world Horns Rev 2 Offshore Wind Farm and located in Poland Karnice Onshore

  12. Wind Energy Research Project under the 6th Framework Programme Peter Hjuler Jensen, Ris National Laboratory,

    E-Print Network [OSTI]

    of wind turbines for future very large-scale applications, e.g. offshore wind farms of several hundred MW in wind farms and grid design issues, are to be analyzed, and new design approaches and concepts developed turbine structures. New developments in the field of wind farm lay out, control, and grid connection

  13. Pollutant transport in coastal areas with and without background wind , J. Massons1

    E-Print Network [OSTI]

    Boyer, Edmond

    Pollutant transport in coastal areas with and without background wind J. Camps1 , J. Massons1 , M dispersion model are used to study the eects of a uniform large-scale wind on the dispersion of a non a background wind. A comparison between model results and measured data (wind and pollutant concentrations

  14. "Offshore Wind farm layout optimization using a Genetic Algorithm" Michael Ameckson

    E-Print Network [OSTI]

    Mountziaris, T. J.

    "Offshore Wind farm layout optimization using a Genetic Algorithm" Michael Ameckson Faculty Mentor: Dr. Erin Baker Zana Cranmer One of the challenging problems with offshore wind is siting the wind considering their interactions. We are developing a model for large scale offshore wind farm planning using

  15. New report assesses offshore wind technology challenges and potential risks and benefits.

    E-Print Network [OSTI]

    New report assesses offshore wind technology challenges and potential risks and benefits of the offshore wind energy industry, Large-Scale Offshore Wind Power in the United States. It provides a broad understanding of the offshore wind resource, and details the associated technology challenges, econom- ics

  16. Offshore Wind Power: Science, engineering, and policy MAST 628-010, Fall 2008

    E-Print Network [OSTI]

    Firestone, Jeremy

    Offshore Wind Power: Science, engineering, and policy MAST 628-010, Fall 2008 Revised 10 October@udel.edu Class web site with lecture notes: www.udel.edu/sakai UD offshore wind research: http, plan, regulate, and develop offshore wind resources for large-scale power production. Offshore wind

  17. Magnetic Fields and Large Scale Structure in a hot Universe. I. General Equations

    E-Print Network [OSTI]

    E. Battaner; E. Florido; J. Jimenez-Vicente

    1997-10-06

    We consider that no mean magnetic field exists during this epoch, but that there is a mean magnetic energy associated with large-scale magnetic inhomogeneities. We study the evolution of these inhomogeneities and their influence on the large scale density structure, by introducing linear perturbations in Maxwell equations, the conservation of momentum-energy equation, and in Einstein field equations. The primordial magnetic field structure is time independent in the linear approximation, only being diluted by the general expansion, so that $\\vec{B}R^2$ is conserved in comoving coordinates. Magnetic fields have a strong influence on the formation of large-scale structure. Firstly, relatively low fields are able to generate density structures even if they were inexistent at earlier times. Second, magnetic fields act anisotropically more recently, modifying the evolution of individual density clouds. Magnetic flux tubes have a tendency to concentrate photons in filamentary patterns.

  18. What Will the Neighbors Think? Building Large-Scale Science Projects Around the World

    ScienceCinema (OSTI)

    Jones, Craig; Mrotzek, Christian; Toge, Nobu; Sarno, Doug

    2010-01-08

    Public participation is an essential ingredient for turning the International Linear Collider into a reality. Wherever the proposed particle accelerator is sited in the world, its neighbors -- in any country -- will have something to say about hosting a 35-kilometer-long collider in their backyards. When it comes to building large-scale physics projects, almost every laboratory has a story to tell. Three case studies from Japan, Germany and the US will be presented to examine how community relations are handled in different parts of the world. How do particle physics laboratories interact with their local communities? How do neighbors react to building large-scale projects in each region? How can the lessons learned from past experiences help in building the next big project? These and other questions will be discussed to engage the audience in an active dialogue about how a large-scale project like the ILC can be a good neighbor.

  19. Copy of Using Emulation and Simulation to Understand the Large-Scale Behavior of the Internet.

    SciTech Connect (OSTI)

    Adalsteinsson, Helgi; Armstrong, Robert C.; Chiang, Ken; Gentile, Ann C.; Lloyd, Levi; Minnich, Ronald G.; Vanderveen, Keith; Van Randwyk, Jamie A; Rudish, Don W.

    2008-10-01

    We report on the work done in the late-start LDRDUsing Emulation and Simulation toUnderstand the Large-Scale Behavior of the Internet. We describe the creation of a researchplatform that emulates many thousands of machines to be used for the study of large-scale inter-net behavior. We describe a proof-of-concept simple attack we performed in this environment.We describe the successful capture of a Storm bot and, from the study of the bot and furtherliterature search, establish large-scale aspects we seek to understand via emulation of Storm onour research platform in possible follow-on work. Finally, we discuss possible future work.3

  20. Solar wind drivers of large geomagnetically induced currents during the solar cycle 23

    E-Print Network [OSTI]

    Bergen, Universitetet i

    amplitudes. The best correlation with the GIC amplitudes was found with the solar wind electric field geomagnetically induced currents during the solar cycle 23, Space Weather, 6, S10002, doi:10.1029/2007SW000374. 1) in tech- nological conductor systems such as power grids or pipelines [e.g., Boteler, 2003; Pirjola, 2000

  1. Towards a model of large scale dynamics in transitional wall-bounded flows

    E-Print Network [OSTI]

    Manneville, Paul

    2015-01-01

    A system of simplified equations is proposed to govern the feedback interactions of large-scale flows present in laminar-turbulent patterns of transitional wall-bounded flows, with small-scale Reynolds stresses generated by the self-sustainment process of turbulence itself modeled using an extension of Waleffe's approach (Phys. Fluids 9 (1997) 883-900), the detailed expression of which is displayed as an annex to the main text.

  2. Grid Simulator for Testing MW-Scale Wind Turbines at NREL (Poster)

    SciTech Connect (OSTI)

    Gevorgian, V.; McDade, M.; Wallen, R.; Mendoza, I.; Shirazi, M.

    2011-05-01

    As described, an initiative by NREL to design and construct a 9-MVA grid simulator to operate with the existing 2.5 MW and new upcoming 5-MW dynamometer facilities will fulfill this role and bring many potential benefits to the U.S. wind industry with the ultimate goal of reducing wind energy integration costs.

  3. Large-Angular-Scale Clustering as a Clue to the Source of UHECRs

    E-Print Network [OSTI]

    Andreas A. Berlind; Glennys R. Farrar

    2007-10-16

    We show that future Ultra-High Energy Cosmic Ray samples should be able to distinguish whether the sources of UHECRs are hosted by galaxy clusters or ordinary galaxies, or whether the sources are uncorrelated with the large-scale structure of the universe. Moreover, this is true independently of arrival direction uncertainty due to magnetic deflection or measurement error. The reason for this is the simple property that the strength of large-scale clustering for extragalactic sources depends on their mass, with more massive objects, such as galaxy clusters, clustering more strongly than lower mass objects, such as ordinary galaxies.

  4. Large scale magnetic field of the Milky Way from WMAP3 data

    E-Print Network [OSTI]

    Ronnie Jansson; Glennys R. Farrar; Andre Waelkens; Torsten A. Ensslin

    2007-08-20

    We report on initial results from a project to constrain the large-scale and turbulent magnetic fields of the Milky Way galaxy, which eventually will incorporate all of the relevant observational data. In this paper we fit popular large scale magnetic field models to WMAP3 polarization maps. We find that the polarization data can constrain certain model parameters but does not uniquely determine the best-fit parameters. We also find that the polarization data alone cannot distinguish between model symmetries, e.g., the existence of field reversals. We show how future UHECR data can break this degeneracy.

  5. Large scale magnetic fields and coherent structures in nonuniform unmagnetized plasma

    SciTech Connect (OSTI)

    Jucker, Martin; Andrushchenko, Zhanna N.; Pavlenko, Vladimir P.

    2006-07-15

    The properties of streamers and zonal magnetic structures in magnetic electron drift mode turbulence are investigated. The stability of such large scale structures is investigated in the kinetic and the hydrodynamic regime, for which an instability criterion similar to the Lighthill criterion for modulational instability is found. Furthermore, these large scale flows can undergo further nonlinear evolution after initial linear growth, which can lead to the formation of long-lived coherent structures consisting of self-bound wave packets between the surfaces of two different flow velocities with an expected modification of the anomalous electron transport properties.

  6. Coverage and large scale anisotropies estimation methods for the Pierre Auger Observatory

    SciTech Connect (OSTI)

    Hamilton, Jean-Christophe; /Paris, IN2P3

    2005-07-01

    When searching for anisotropies in the arrival directions of Ultra High Energy Cosmic Rays, one must estimate the number of events expected in each direction of the sky in the case of a perfect isotropy. We present in this article a new method, developed for the Auger Observatory, based on a smooth estimate of the zenith angle distribution obtained from the data itself (which is essentially unchanged in the case of the presence of a large scale anisotropy pattern). We also study the sensitivity of several methods to detect large-scale anisotropies in the cosmic ray arrival direction distribution : Rayleigh analysis, dipole fitting and angular power spectrum estimation.

  7. Two-scale large deviations for chemical reaction kinetics through second quantization path integral

    E-Print Network [OSTI]

    Tiejun Li; Feng Lin

    2015-08-26

    Motivated by the study of the rare event for a typical genetic switching model in systems biology, we aim to establish the general two-scale large deviations for chemical reaction kinetic systems in this paper. We build a formal approach to explicitly obtain the large deviation rate functionals of the considered two-scale processes based upon the second-quantization path integral technique. This approach is shown to be superior than the well-known WKB asymptotics in giving the correct large deviation rate functionals rather than a non-unique Hamilton-Jacobi equation for the quasi-potential. We get three important types of large deviation results when the underlying two times scales are in three different regimes. This is realized by singular perturbation analysis to the rate functionals obtained by path integral. We find that the three regimes correspond to the same mean-field deterministic limit but completely different chemical Langevin approximations. The obtained results are natural extensions of the classical large volume limit in chemical reaction kinetics. Our framework and results can be applied to understand general multi-scale systems including diffusion processes.

  8. Wind Integration National Dataset (WIND) Toolkit

    Office of Energy Efficiency and Renewable Energy (EERE)

    For utility companies, grid operators and other stakeholders interested in wind energy integration, collecting large quantities of high quality data on wind energy resources is vitally important....

  9. Wind Turbine Scaling Enables Projects to Reach New Heights | Department of

    Energy Savers [EERE]

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QA J-E-1 SECTION J APPENDIX E LIST OFAMERICA'S FUTURE.Energy Wind Power Today, 2010, WindWind Taking Flight

  10. Page Digest for Large-Scale Web Services Daniel Rocco, David Buttler, Ling Liu

    E-Print Network [OSTI]

    Liu, Ling

    Page Digest for Large-Scale Web Services Daniel Rocco, David Buttler, Ling Liu Georgia Institute, 2003 Abstract The rapid growth of the World Wide Web and the Internet has fueled interest in Web services and the Semantic Web, which are quickly becoming important parts of modern electronic commerce

  11. A fast, large-scale learning method for protein sequence classification

    E-Print Network [OSTI]

    Pavlovic, Vladimir

    A fast, large-scale learning method for protein sequence classification Pavel Kuksa, Pai-Hsi Huang spatial sample kernels (SSSK). The approach offers state-of-the-art accuracy for sequence classification]: Applications; I.5.2. [Pattern Recognition]: De- corresponding author Permission to make digital or hard copies

  12. YouTubeEvent: on Large-Scale Video Event Classification Bingbing Ni

    E-Print Network [OSTI]

    Cortes, Corinna

    YouTubeEvent: on Large-Scale Video Event Classification Bingbing Ni Advanced Digital Sciences the problem of general event classification from uncontrolled YouTube videos. It is a challenging task due from YouTube to represent these categories. To improve classification per- formance, video content

  13. Day-Ahead and Real-Time Models for Large-Scale Energy Storage

    E-Print Network [OSTI]

    Engineering Research Center Empowering Minds to Engineer the Future Electric Energy System #12;DayDay-Ahead and Real-Time Models for Large-Scale Energy Storage Final Project Report Power Systems of Electrical, Computer, and Energy Engineering P.O. BOX 875706 Tempe, AZ 85287-5706 Phone: 480 965-1276 Fax

  14. Analysis of Large-Scale Social Surveys1 Elaine Zanutto2

    E-Print Network [OSTI]

    Gelman, Andrew

    Large-scale social surveys are an important source of information for a wide range of topics an inexpensive and easily accessible source of information on a wide range of topics including education, health, economics, demography, politics, and criminal justice. These surveys may serve as a primary data source

  15. Funding for Large-Scale Sustainable Energy Projects Combining Expert Opinions to Support Decisions

    E-Print Network [OSTI]

    Mountziaris, T. J.

    Funding for Large-Scale Sustainable Energy Projects Combining Expert Opinions to Support Decisions technologies: solar, carbon capture, nuclear, biofuels, and electricity from biomass. The challenge a probability distribution over outcomes dependent on R&D funding amounts. This probability distribution

  16. A Large-scale Study on Predicting and Contextualizing Building Energy Usage J. Zico Kolter

    E-Print Network [OSTI]

    Kolter, J. Zico

    Joseph Ferreira Jr. Department of Urban Studies and Planning Massachusetts Institute of TechnologyA Large-scale Study on Predicting and Contextualizing Building Energy Usage J. Zico Kolter Computer Cambridge, MA 02139 Abstract In this paper we present a data-driven approach to mod- eling end user energy

  17. Large-Scale Fabrication, 3D Tomography, and Lithium-Ion Battery Application of Porous Silicon

    E-Print Network [OSTI]

    Zhou, Chongwu

    Large-Scale Fabrication, 3D Tomography, and Lithium-Ion Battery Application of Porous Silicon, United States *S Supporting Information ABSTRACT: Recently, silicon-based lithium-ion battery anodes have for the next-generation lithium-ion batteries with enhanced capacity and energy density. KEYWORDS: Cost

  18. Solving Large Scale Binary Quadratic Problems: Spectral Methods vs. Semidefinite Programming

    E-Print Network [OSTI]

    Lunds Universitet

    with good performance. 1 1. Introduction Spectral relaxation methods can be applied to a wide variety]. In partic- ular, large scale problems that can be formulated with a binary quadratic objective function. The two methods are based on a sub- gradient optimization scheme. We show good performance on a number

  19. Simulation-based optimization of communication protocols for large-scale wireless sensor networks1

    E-Print Network [OSTI]

    Maróti, Miklós

    everyday life more comfortable, e.g. Intelligent Spaces [3]. These sensor networks often use distributed of the wireless sensors may vary greatly, but invariably each of the intelligent sensors is a compact device1 Simulation-based optimization of communication protocols for large-scale wireless sensor networks

  20. Large-scale simulations of fluctuating biological membranes Andrea Pasqua,1,a

    E-Print Network [OSTI]

    Oster, George

    in their computational demands, these approaches are still limited in the scope of fluctuations and response they can's response to a prodding nanorod. © 2010 American Institute of Physics. doi:10.1063/1.3382349 I. INTRODUCTION feasibly capture. Extending computer simulations to examine large scale behaviors such as aggregation