Sample records for large scale power

  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 Eucalyptus Energy Farms and Power Cogeneration1

    E-Print Network [OSTI]

    Standiford, Richard B.

    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

  3. SIMULATING LARGE-SCALE STRUCTURE FORMATION FOR BSI POWER SPECTRA

    E-Print Network [OSTI]

    V. Mueller

    1995-05-30T23:59:59.000Z

    A double inflationary model provides perturbation spectra with enhanced power at large scales (Broken Scale Invariant perturbations -- BSI), leading to a promising scenario for the formation of cosmic structures. We describe a series of high-resolution PM simulations with a model for the thermodynamic evolution of baryons in which we are capable of identifying 'galaxy' halos with a reasonable mass spectrum and following the genesis of large and super-large scale structures. The power spectra and correlation functions of 'galaxies' are compared with reconstructed power spectra of the CfA catalogue and the correlation functions of the Las Campanas Deep Redshift Survey.

  4. Optimal operation of large-scale power systems

    SciTech Connect (OSTI)

    Lee, K.Y.; Ortiz, J.L.; Mohtadi, M.A.; Park, Y.M.

    1988-05-01T23:59:59.000Z

    This paper presents a method for an optimal operation of large-scale power systems similar to the one utilized by the Houston Lighting and Power Company. The main objective is to minimize the system fuel costs, and maintain an acceptable system performance in terms of limits on generator real and reactive power outputs, transformer tap settings, and bus voltage levels. Minimizing the fuel costs of such large-scale systems enhances the performance of optimal real power generator allocation and of optimal power flow that results in an economic dispatch. The gradient projection method (GPM) is utilized in solving the optimization problems. It is an iterative numerical procedure for finding an extremum of a function of several variables that are required to satisfy various constraining relations without using penalty functions or Lagrange multipliers among other advantages. Mathematical models are developed to represent the sensitivity relationships between dependent and control variables for both real- and reactive-power optimization procedures; and thus eliminate the use of B-coefficients. Data provided by the Houston lighting and Power Company are used to demonstrate the effectiveness of the proposed procedures.

  5. Impact of Wind Shear and Tower Shadow Effects on Power System with Large Scale Wind Power

    E-Print Network [OSTI]

    Hu, Weihao

    Impact of Wind Shear and Tower Shadow Effects on Power System with Large Scale Wind Power to wind speed variations, the wind shear and the tower shadow effects. The fluctuating power may be ableSILENT/PowerFactory. In this paper, the impacts of wind shear and tower shadow effects on the small signal stability of power systems

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

    E-Print Network [OSTI]

    Michele Cicoli; Sean Downes; Bhaskar Dutta; Francisco G. Pedro; Alexander Westphal

    2014-07-03T23:59:59.000Z

    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 and model-independent analysis of any possible non-slow-roll background evolution prior to 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-$\\ell$, and so seem disfavoured by recent observational hints for a lack of CMB power at $\\ell\\lesssim 40$. We also comment on the importance of initial conditions and the possibility to have multiple pre-inflationary stages.

  7. Large-Scale Data Challenges in Future Power Grids

    SciTech Connect (OSTI)

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

    2013-03-25T23:59:59.000Z

    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.

  8. Ferroelectric opening switches for large-scale pulsed power drivers.

    SciTech Connect (OSTI)

    Brennecka, Geoffrey L.; Rudys, Joseph Matthew; Reed, Kim Warren; Pena, Gary Edward; Tuttle, Bruce Andrew; Glover, Steven Frank

    2009-11-01T23:59:59.000Z

    Fast electrical energy storage or Voltage-Driven Technology (VDT) has dominated fast, high-voltage pulsed power systems for the past six decades. Fast magnetic energy storage or Current-Driven Technology (CDT) is characterized by 10,000 X higher energy density than VDT and has a great number of other substantial advantages, but it has all but been neglected for all of these decades. The uniform explanation for neglect of CDT technology is invariably that the industry has never been able to make an effective opening switch, which is essential for the use of CDT. Most approaches to opening switches have involved plasma of one sort or another. On a large scale, gaseous plasmas have been used as a conductor to bridge the switch electrodes that provides an opening function when the current wave front propagates through to the output end of the plasma and fully magnetizes the plasma - this is called a Plasma Opening Switch (POS). Opening can be triggered in a POS using a magnetic field to push the plasma out of the A-K gap - this is called a Magnetically Controlled Plasma Opening Switch (MCPOS). On a small scale, depletion of electron plasmas in semiconductor devices is used to affect opening switch behavior, but these devices are relatively low voltage and low current compared to the hundreds of kilo-volts and tens of kilo-amperes of interest to pulsed power. This work is an investigation into an entirely new approach to opening switch technology that utilizes new materials in new ways. The new materials are Ferroelectrics and using them as an opening switch is a stark contrast to their traditional applications in optics and transducer applications. Emphasis is on use of high performance ferroelectrics with the objective of developing an opening switch that would be suitable for large scale pulsed power applications. Over the course of exploring this new ground, we have discovered new behaviors and properties of these materials that were here to fore unknown. Some of these unexpected discoveries have lead to new research directions to address challenges.

  9. An improved voltage control on large-scale power system

    SciTech Connect (OSTI)

    Vu, H.; Pruvot, P.; Launay, C.; Harmand, Y. [Electricite de France, Clamart (France). Study and Research Div.] [Electricite de France, Clamart (France). Study and Research Div.

    1996-08-01T23:59:59.000Z

    To achieve a better voltage-var control in the electric power transmission system, different facilities are used. Generators are equipped with automatic voltage regulators to cope with sudden and random changes voltage caused by natural load fluctuations or failures. Other devices like capacitors, inductors, transformers with on load tap changers are installed on the network. Faced with the evolution of the network and operating conditions, electricity utilities are more and more interested in overall and coherent control systems, automatic or not. These systems are expected to coordinate the actions of local facilities for a better voltage control (more stable and faster reaction) inside different areas of the network in case of greater voltage and var variations. They affords besides a better use of existing reactive resources. Also, installation of new devices can be avoided allowing economy of investment. With this frame of mind, EDF has designed a system called Co-ordinated Secondary Voltage Control (CSVC). It`s an automatic closed loop system with a dynamic of a few minutes. It takes into account the network conditions (topology, loads), the voltage limits and the generator operating constraints. This paper presents recent improvements which allow the CSVC to control the voltage profile and different kinds of reactive means on a large-scale power system. Furthermore, this paper presents solution to spread out investment costs over several years, considering a deployment gradually extended.

  10. 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

  11. 2144 IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 22, NO. 4, NOVEMBER 2007 Fast SCUC for Large-Scale Power Systems

    E-Print Network [OSTI]

    Fu, Yong

    2144 IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 22, NO. 4, NOVEMBER 2007 Fast SCUC for Large introduces an efficient fast SCUC (F-SCUC) for large-scale power systems. Main components used-changing and phase-shifting transformers, and so on [1]. Such SCUC problem is a nonconvex, nonlinear, large

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

    E-Print Network [OSTI]

    Pota, Himanshu Roy

    development of wind energy tech- nology and the current world-wide status of grid-connected as well as standImpacts of Large-Scale Wind Generators Penetration on the Voltage Stability of Power Systems M. J systems and their dynamic behaviours to identify critical issues that limit the large-scale integration

  13. 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

  14. Reactive power planning of large-scale systems

    SciTech Connect (OSTI)

    Burchett, R.C.; Happ, H.H.; Vierath, D.R.

    1983-01-01T23:59:59.000Z

    This paper discusses short-term operations planning applications in reactive power management involving existing equipment. Reactive power planning involves the sizing and siting of additional reactive support equipment in order to satisfy system voltage constraints (minimum and maximum limits) under both normal and contingency conditions. The use of the Optimal Power Flow (OPF) and the VARPLAN computer codes for operations planning are examined. The OPF software can be used to determine if reactive outputs from nearby generators are scheduled properly, and to confirm that parallel transformers have been properly set. A major benefit of the system planning software VARPLAN is the ability to simultaneously consider both normal and contingency conditions, while adding a minimal amount of new reactive power. Applications to long-term system planning of new reactive power sources are described.

  15. Simulating the Power Consumption of Large-Scale Sensor Network Applications

    E-Print Network [OSTI]

    Simulating the Power Consumption of Large-Scale Sensor Network Applications Victor Shnayder, Mark of the most important as- pects of sensor application design: that of power consump- tion. While simple approximations of overall power usage can be derived from estimates of node duty cycle and com- munication rates

  16. A SPECULATIVE FRAMEWORK FOR THE APPLICATION OF ARTIFICIAL INTELLIGENCE TO LARGE SCALE INTERCONNECTED POWER SYSTEMS

    E-Print Network [OSTI]

    Hartley, Roger

    INTERCONNECTED POWER SYSTEMS By Nadipuram R. Prasad Satish J. Ranade Electrical Engineering Department New Mexico) technologies to the operation and control of large scale interconnected electric power systems. A fundamental issue discussed in this paper is the control structure of power systems. An evaluation of the control

  17. Model Abstraction Techniques for Large-Scale Power Systems

    E-Print Network [OSTI]

    Report on System Simulation using High Performance Computing Prepared by New Mexico Tech New Mexico: Application of High Performance Computing to Electric Power System Modeling, Simulation and Analysis Task Two

  18. Including Variability in Large-Scale Cluster Power Models

    E-Print Network [OSTI]

    Rivoire, Suzanne

    , mobile (laptop), desktop, and server processor spac- es, reflecting energy-efficient server.rivoire@sonoma.edu University of CA, Santa Cruz3 eka@soe.ucsc.edu Abstract--Studying the energy efficiency of large five-node clusters using embedded, laptop, desktop, and server processors. The variation is manifested

  19. PNNL-SA-XXXXX Ultra Large-Scale Power System Control and

    E-Print Network [OSTI]

    Low, Steven H.

    PNNL-SA-XXXXX Ultra Large-Scale Power System Control and Coordination Architecture A Strategic Institute of Technology Rick Geiger Utilities and Smart Grid Cisco Systems #12;#12;PNNL-SA-XXXXX #12;PNNL Richland, Washington 99352 #12;PNNL-SA-XXXXX #12;#12;PNNL-SA-XXXXX 1.0 Introduction Electric power grids

  20. Identification of Market Power in Large-Scale Electric Energy Markets Bernard C. Lesieutre

    E-Print Network [OSTI]

    Identification of Market Power in Large-Scale Electric Energy Markets Bernard C. Lesieutre Hyung and competitive operation of centrally- dispatched electricity markets. Traditional measures for market power demand and reserve requirements, a centrally-dispatched electricity market provides a transparent

  1. A decomposition approach to optimal reactive power dispatch in large-scale power systems

    SciTech Connect (OSTI)

    Deeb, N.I.

    1989-01-01T23:59:59.000Z

    Power systems network operation is aimed at reducing system losses and minimizing the operational cost while satisfying performance requirements in normal and contingency situations. In this project, the procedure for the reactive power optimization has the solutions for investment and operation subproblems. The global solution is an iterative process between these two subproblems using the Bender decomposition method. In the investment subproblem decisions for the capacity and location of new reactive sources are made. These decisions are used in the optimization of the system operation. The outstanding features of the proposed method are that it does not require any matrix inversion, will save computation time and memory space, and can be implemented on very large scale power systems. The method employs a linearized objective function and constraints, and is based on adjusting control variables which are tap positions of transformers and reactive power injections. Linear programming is used to calculate voltage increments, which would minimize transmission losses, and adjustments of control variables would be obtained by a modified Jacobian matrix. This approach would greatly simplify the application of Dantzig-Wolfe decomposition method for solving the operation subproblem. According to the mathematical features of the Dantzig-Wolfe method, a multi-area approach is implemented and system equations are decomposed into a master problem and several subproblems. The master problem is formed by constraints, which represent linking transmission lines between areas. Two updated techniques are incorporated in the method to enhance the optimization process, which would save additional computation time and memory space. The proposed method is applied to the IEEE-30 bus system, a 60-bus system, a 180-bus system and a 1200-bus system, and numerical results are presented.

  2. Inflation that runs naturally: Gravitational waves and suppression of power at large and small scales

    E-Print Network [OSTI]

    Quinn E. Minor; Manoj Kaplinghat

    2015-03-08T23:59:59.000Z

    We point out three correlated predictions of the axion monodromy inflation model: large amplitude of gravitational waves, suppression of power on horizon scales and on scales relevant for the formation of dwarf galaxies. While these predictions are likely generic to models with oscillations in the inflaton potential, the axion monodromy model naturally accommodates the required running spectral index through Planck-scale corrections to the inflaton potential. Applying this model to a combined data set of Planck, ACT, SPT, and WMAP low-$\\ell$ polarization cosmic microwave background (CMB) data, we find a best-fit tensor-to-scalar ratio $r_{0.05} = 0.07^{+0.05}_{-0.04}$ due to gravitational waves, which may have been observed by the BICEP2 experiment. Despite the contribution of gravitational waves, the total power on large scales (CMB power spectrum at low multipoles) is lower than the standard $\\Lambda$CDM cosmology with a power-law spectrum of initial perturbations and no gravitational waves, thus mitigating some of the tension on large scales. There is also a reduction in the matter power spectrum of 20-30\\% at scales corresponding to $k = 10~{\\rm Mpc}^{-1}$, which are relevant for dwarf galaxy formation. This will alleviate some of the unsolved small-scale structure problems in the standard $\\Lambda$CDM cosmology. The inferred matter power spectrum is also found to be consistent with recent Lyman-$\\alpha$ forest data, which is in tension with the Planck-favored $\\Lambda$CDM model with power-law primordial power spectrum.

  3. Solar Power in the Desert: Are the current large-scale solar developments really improving California’s environment?

    E-Print Network [OSTI]

    Allen, Michael F.; McHughen, Alan

    2011-01-01T23:59:59.000Z

    D EVELOPMENT I SSUES Solar Power in the Desert: Are the2 Most of the large-scale solar power projects utilize largethat will be affected by solar power facilities. There are

  4. A TWO-STAGE APPROACH TO SOLVING LARGE-SCALE OPTIMAL POWER FLOWS

    E-Print Network [OSTI]

    Gross, George

    A TWO-STAGE APPROACH TO SOLVING LARGE-SCALE OPTIMAL POWER FLOWS *F e l i x F. Wu George Gross James problem is formulated as an unconstrained minimization problem using penalty functions and i s solved ] and Sasson and Merrill [ 3 ] . The s i z e and t h e extensive amount of computation involved i n solving t h

  5. Production cost and air emissions impacts of coal cycling in power systems with large-scale wind penetration

    E-Print Network [OSTI]

    Jaramillo, Paulina

    on dispatchable generating capacity, such as coal and natural gas power plants, which can be cycled in responseProduction cost and air emissions impacts of coal cycling in power systems with large-scale wind emissions impacts of coal cycling in power systems with large-scale wind penetration David Luke Oates

  6. Large-scale Ocean-based or Geothermal Power Plants by Thermoelectric Effects

    E-Print Network [OSTI]

    Liu, Liping

    2012-01-01T23:59:59.000Z

    Heat resources of small temperature difference are easily accessible, free and unlimited on earth. Thermoelectric effects provide the technology for converting these heat resources directly into electricity. We present designs of electricity generators based on thermoelectric effects and using heat resources of small temperature difference, e.g., ocean water at different depths and geothermal sources, and conclude that large-scale power plants based on thermoelectric effects are feasible and economically competitive. The key observation is that the power factor of thermoelectric materials, unlike the figure of merit, can be improved by orders of magnitude upon laminating good conductors and good thermoelectric materials. The predicted large-scale power plants based on thermoelectric effects, if validated, will have a global economic and social impact for its scalability, and the renewability, free and unlimited supply of heat resources of small temperature difference on earth.

  7. PowerGrid - A Computation Engine for Large-Scale Electric Networks

    SciTech Connect (OSTI)

    Chika Nwankpa

    2011-01-31T23:59:59.000Z

    This Final Report discusses work on an approach for analog emulation of large scale power systems using Analog Behavioral Models (ABMs) and analog devices in PSpice design environment. ABMs are models based on sets of mathematical equations or transfer functions describing the behavior of a circuit element or an analog building block. The ABM concept provides an efficient strategy for feasibility analysis, quick insight of developing top-down design methodology of large systems and model verification prior to full structural design and implementation. Analog emulation in this report uses an electric circuit equivalent of mathematical equations and scaled relationships that describe the states and behavior of a real power system to create its solution trajectory. The speed of analog solutions is as quick as the responses of the circuit itself. Emulation therefore is the representation of desired physical characteristics of a real life object using an electric circuit equivalent. The circuit equivalent has within it, the model of a real system as well as the method of solution. This report presents a methodology of the core computation through development of ABMs for generators, transmission lines and loads. Results of ABMs used for the case of 3, 6, and 14 bus power systems are presented and compared with industrial grade numerical simulators for validation.

  8. 752 IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 24, NO. 2, MAY 2009 Large-Scale Distribution Planning--Part

    E-Print Network [OSTI]

    Catholic University of Chile (Universidad Católica de Chile)

    methodology for low-voltage distribution network planning. Combined optimization of transformers, "Large-scale distribution planning--Part I: Simultaneous network and transformer optimization" [1752 IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 24, NO. 2, MAY 2009 Large-Scale Distribution Planning

  9. A Power Provision and Capping Architecture for Large Scale Systems Yongpeng Liu, Hong Zhu, Kai Lu and Yongyan Liu

    E-Print Network [OSTI]

    Zhu, Hong

    whole system's total power consumption under budget. Two policies are designed and implemented to select amount of energy. According to the recent TOP500 list of high performance systems [2], the average powerA Power Provision and Capping Architecture for Large Scale Systems Yongpeng Liu, Hong Zhu, Kai Lu

  10. IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 29, NO. 1, JANUARY 2014 489 Large-Scale Integration of Deferrable

    E-Print Network [OSTI]

    Oren, Shmuel S.

    scheduling, wind power generation. I. INTRODUCTION THE key disadvantage of renewable resources relative and demand response integration on power system operations it is necessary to represent the balancing operIEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 29, NO. 1, JANUARY 2014 489 Large-Scale Integration

  11. Understanding the Impact of Large-Scale Penetration of Micro Combined Heat & Power Technologies within Energy Systems

    E-Print Network [OSTI]

    Catholic University of Chile (Universidad Católica de Chile)

    of Micro Combined Heat & Power Technologies within Energy Systems by Karen de los Ángeles Tapia-based electricity generation technologies are considered, by energy experts and also policymakers, to be essentialUnderstanding the Impact of Large-Scale Penetration of Micro Combined Heat & Power Technologies

  12. 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

  13. 744 IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 24, NO. 2, MAY 2009 Large-Scale Distribution Planning--Part I

    E-Print Network [OSTI]

    Catholic University of Chile (Universidad Católica de Chile)

    744 IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 24, NO. 2, MAY 2009 Large-Scale Distribution Planning--Part I: Simultaneous Network and Transformer Optimization Alejandro Navarro, Member, IEEE, and Hugh-voltage distribution networks. Combined optimization of transformers and associated networks is per- formed

  14. Large Scale Power and Running Spectral Index in New Old Inflation

    SciTech Connect (OSTI)

    Dvali, G.

    2003-11-07T23:59:59.000Z

    We have proposed a new class of inflationary scenarios in which the first stage of expansion is driven by ''old'' false vacuum inflation. This ends by nucleation of a bubble, which then further inflates. Unlike the standard slow-roll scenarios the ''clock'' ending the second inflationary phase is not a local order parameter, but rather the average value of an oscillating scalar field, which locks the system at a saddle point of the potential in a temporary inflationary state. Inflation ends when the amplitude drops below a certain critical point and liberates the system from the false vacuum state. The second stage of inflation has only about 50 e-foldings, a number which is determined entirely by the ratio of the fundamental mass scales, such as the Planck/string scale and the supersymmetry breaking scale. The density perturbations are generated due to fluctuations of moduli-dependent Yukawa couplings. In this note we explore the observable imprints in the fluctuation spectrum of generic cross-couplings in the superpotential and in the Kaehler potential. We show that in the presence of generic non-renormalizable interactions in the superpotential between the fluctuating modulus and the oscillating inflaton, the amplitude of the density perturbations is exponentially cut-off for sufficiently large wavelengths. With reasonable choices of scales and interactions, this long wavelength cutoff can occur at approximately the current horizon size. The perturbative corrections in the Kaehler potential give non-trivial potentially observable tilt and a running of the spectral index which is different from the standard inflationary models.

  15. The constraints on power spectrum of relic gravitational waves from current observations of large-scale structure of the Universe

    E-Print Network [OSTI]

    B. Novosyadlyj; S. Apunevych

    2004-12-02T23:59:59.000Z

    We carry out the determination of the amplitude of relic gravitational waves power spectrum. Indirect best-fit technique was applied to compare observational data and theory predictions. As observations we have used data on large-scale structure (LSS) of the Universe and anisotropy of cosmic microwave background (CMB) temperature. The conventional inflationary model with 11 parameters has been investigated, all of them evaluated jointly. This approach gave us a possibility to find parameters of power spectrum of gravitational waves along with statistical errors. The main result consists in following: WMAP data on power spectrum of CMB temperature fluctuations along with LSS data prefer model with small amplitude of tensor mode power spectrum, close to zero. The upper limit for its amplitude at quadupole harmonics T/S=0.6 at 95% C.L.

  16. THE SCALE-UP OF LARGE PRESSURIZED FLUIDIZED BEDS FOR ADVANCED COAL-FIRED POWER PROCESSES

    SciTech Connect (OSTI)

    Leon R. Glicksman; Michael Louge; Hesham F. Younis; Richard Tan; Mathew Hyre; Mark Torpey

    2003-11-24T23:59:59.000Z

    This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor an agency thereof, nor any of the their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, A combined-cycle High Performance Power System (HIPPS) capable of overall cycle efficiencies approaching 50% has been proposed and designed by Foster Wheeler Development Corporation (FWDC). A pyrolyzer in the first stage of the HIPPS process converts a coal feedstock into fuel gas and char at an elevated pressure of 1.4 Map. (206 psia) and elevated temperature of 930 C (1700 F). The generated char serves as the feedstock for a Pulverized Coal (PC) boiler operating at atmospheric pressure, and the fuel gas is directly fired in a gas turbine. The hydrodynamic behavior of the pyrolyzer strongly influences the quality of both the fuel gas and the generated char, the energy split between the gas turbine and the steam turbine, and hence the overall efficiency of the system. By utilizing a simplified set of scaling parameters (Glicksman et al.,1993), a 4/7th labscale cold model of the pyrolyzer operating at ambient temperature and pressure was constructed and tested. The scaling parameters matched include solid to gas density ratio, Froude number, length to diameter ratio; dimensionless superficial gas velocity and solid recycle rate, particle sphericity and particle size distribution (PSD).

  17. Large scale disease prediction

    E-Print Network [OSTI]

    Schmid, Patrick R. (Patrick Raphael)

    2008-01-01T23:59:59.000Z

    The objective of this thesis is to present the foundation of an automated large-scale disease prediction system. Unlike previous work that has typically focused on a small self-contained dataset, we explore the possibility ...

  18. The power of event-driven analytics in Large Scale Data Processing

    ScienceCinema (OSTI)

    None

    2011-04-25T23:59:59.000Z

    FeedZai is a software company specialized in creating high-­-throughput low-­-latency data processing solutions. FeedZai develops a product called "FeedZai Pulse" for continuous event-­-driven analytics that makes application development easier for end users. It automatically calculates key performance indicators and baselines, showing how current performance differ from previous history, creating timely business intelligence updated to the second. The tool does predictive analytics and trend analysis, displaying data on real-­-time web-­-based graphics. In 2010 FeedZai won the European EBN Smart Entrepreneurship Competition, in the Digital Models category, being considered one of the "top-­-20 smart companies in Europe". The main objective of this seminar/workshop is to explore the topic for large-­-scale data processing using Complex Event Processing and, in particular, the possible uses of Pulse in the scope of the data processing needs of CERN. Pulse is available as open-­-source and can be licensed both for non-­-commercial and commercial applications. FeedZai is interested in exploring possible synergies with CERN in high-­-volume low-­-latency data processing applications. The seminar will be structured in two sessions, the first one being aimed to expose the general scope of FeedZai's activities, and the second focused on Pulse itself: 10:00-11:00 FeedZai and Large Scale Data Processing Introduction to FeedZai FeedZai Pulse and Complex Event Processing Demonstration Use-Cases and Applications Conclusion and Q&A 11:00-11:15 Coffee break 11:15-12:30 FeedZai Pulse Under the Hood A First FeedZai Pulse Application PulseQL overview Defining KPIs and Baselines Conclusion and Q&A About the speakers Nuno Sebastião is the CEO of FeedZai. Having worked for many years for the European Space Agency (ESA), he was responsible the overall design and development of Satellite Simulation Infrastructure of the agency. Having left ESA to found FeedZai, Nuno is currently responsible for the whole operations of the company. Nuno holds an M.Eng. in Informatics Engineering for the University of Coimbra, and an MBA from the London Business School. Paulo Marques is the CTO of FeedZai, being responsible for product development. Paulo is an Assistant Professor at the University of Coimbra, in the area of Distributed Data Processing, and an Adjunct Associated Professor at Carnegie Mellon, in the US. In the past Paulo lead a large number of projects for institutions like the ESA, Microsoft Research, SciSys, Siemens, among others, being now fully dedicated to FeedZai. Paulo holds a Ph.D. in Distributed Systems from the University of Coimbra.

  19. Total Cost Per MwH for all common large scale power generation...

    Open Energy Info (EERE)

    power generation soruces ? I am talking about the cost of mountain top removal for coal mined that way, the trip to the power plant, the sludge pond or ash heap, the cost of...

  20. IEEE TRANSACTIONS LARGE SCALE INTEGRATION (VLSI) SYSTEMS, MARCH Trading Off Transient Fault Tolerance and Power

    E-Print Network [OSTI]

    Tessier, Russell

    tolerance also ultra­low­power consumption limited battery In paper, a highly accurate method estimating. INTRODUCTION T RENDS CMOS technology, applications, operating conditions resulting in circuits higher power con batteries their source power. limited battery the ability of replace recharge battery, circuits used

  1. Variability of Power from Large-Scale Solar Photovoltaic Scenarios in the State of Gujarat: Preprint

    SciTech Connect (OSTI)

    Parsons, B.; Hummon, M.; Cochran, J.; Stoltenberg, B.; Batra, P.; Mehta, B.; Patel, D.

    2014-04-01T23:59:59.000Z

    India has ambitious goals for high utilization of variable renewable power from wind and solar, and deployment has been proceeding at a rapid pace. The western state of Gujarat currently has the largest amount of solar generation of any Indian state, with over 855 Megawatts direct current (MWDC). Combined with over 3,240 MW of wind, variable generation renewables comprise nearly 18% of the electric-generating capacity in the state. A new historic 10-kilometer (km) gridded solar radiation data set capturing hourly insolation values for 2002-2011 is available for India. We apply an established method for downscaling hourly irradiance data to one-minute irradiance data at potential PV power production locations for one year, 2006. The objective of this report is to characterize the intra-hour variability of existing and planned photovoltaic solar power generation in the state of Gujarat (a total of 1.9 gigawatts direct current (GWDC)), and of five possible expansion scenarios of solar generation that reflect a range of geographic diversity (each scenario totals 500-1,000 MW of additional solar capacity). The report statistically analyzes one year's worth of power variability data, applied to both the baseline and expansion scenarios, to evaluate diurnal and seasonal power fluctuations, different timescales of variability (e.g., from one to 15 minutes), the magnitude of variability (both total megawatts and relative to installed solar capacity), and the extent to which the variability can be anticipated in advance. The paper also examines how Gujarat Energy Transmission Corporation (GETCO) and the Gujarat State Load Dispatch Centre (SLDC) could make use of the solar variability profiles in grid operations and planning.

  2. Variability of Power from Large-Scale Solar Photovoltaic Scenarios in the State of Gujarat (Presentation)

    SciTech Connect (OSTI)

    Parsons, B.; Hummon, M.; Cochran, J.; Stoltenberg, B.; Batra, P.; Mehta, B.; Patel, D.

    2014-04-01T23:59:59.000Z

    India has ambitious goals for high utilization of variable renewable power from wind and solar, and deployment has been proceeding at a rapid pace. The western state of Gujarat currently has the largest amount of solar generation of any Indian state, with over 855 Megawatts direct current (MWDC). Combined with over 3,240 MW of wind, variable generation renewables comprise nearly 18% of the electric-generating capacity in the state. A new historic 10-kilometer (km) gridded solar radiation data set capturing hourly insolation values for 2002-2011 is available for India. We apply an established method for downscaling hourly irradiance data to one-minute irradiance data at potential PV power production locations for one year, 2006. The objective of this report is to characterize the intra-hour variability of existing and planned photovoltaic solar power generation in the state of Gujarat (a total of 1.9 gigawatts direct current (GWDC)), and of five possible expansion scenarios of solar generation that reflect a range of geographic diversity (each scenario totals 500-1,000 MW of additional solar capacity). The report statistically analyzes one year's worth of power variability data, applied to both the baseline and expansion scenarios, to evaluate diurnal and seasonal power fluctuations, different timescales of variability (e.g., from one to 15 minutes), the magnitude of variability (both total megawatts and relative to installed solar capacity), and the extent to which the variability can be anticipated in advance. The paper also examines how Gujarat Energy Transmission Corporation (GETCO) and the Gujarat State Load Dispatch Centre (SLDC) could make use of the solar variability profiles in grid operations and planning.

  3. A methodology for understanding the impacts of large-scale penetration of micro-combined heat and power

    SciTech Connect (OSTI)

    Tapia-Ahumada, K. [MIT Energy Initiative, Massachusetts Institute of Technology, Cambridge, MA (United States); Pérez-Arriaga, I. J. [Institute for Research in Technology, Comillas Pontifical University (Spain); Moniz, Ernest J. [MIT Energy Initiative, Massachusetts Institute of Technology, Cambridge, MA (United States)

    2013-10-01T23:59:59.000Z

    Co-generation at small kW-e scale has been stimulated in recent years by governments and energy regulators as one way to increasing energy efficiency and reducing CO2emissions. If a widespread adoption should be realized, their effects from a system's point of view are crucial to understand the contributions of this technology. Based on a methodology that uses long-term capacity planning expansion, this paper explores some of the implications for an electric power system of having a large number of micro-CHPs. Results show that fuel cells-based micro-CHPs have the best and most consistent performance for different residential demands from the customer and system's perspectives. As the penetration increases at important levels, gas-based technologies - particularly combined cycle units - are displaced in capacity and production, which impacts the operation of the electric system during summer peak hours. Other results suggest that the tariff design impacts the economic efficiency of the system and the operation of micro-CHPs under a price-based strategy. Finally, policies aimed at micro-CHPs should consider the suitability of the technology (in size and heat-to-power ratio) to meet individual demands, the operational complexities of a large penetration, and the adequacy of the economic signals to incentivize an efficient and sustainable operation. Highlights: Capacity displacements and daily operation of an electric power system are explored; Benefits depend on energy mix, prices, and micro-CHP technology and control scheme; Benefits are observed mostly in winter when micro-CHP heat and power are fully used; Micro-CHPs mostly displace installed capacity from natural gas combined cycle units; and, Tariff design impacts economic efficiency of the system and operation of micro-CHPs.

  4. Large-scale optimal power flow: Effects of initialization, decoupling and discretization

    SciTech Connect (OSTI)

    Papalexopoulos, A.D.; Imparato, C.F.; Wu, F.F.

    1989-08-01T23:59:59.000Z

    The optimal power flow has entered a new era since the introduction of second-order methods. These methods have renewed hopes for its on-line application in Energy Management Systems. This paper reports on some of the results of tests of a second-order OPF method. The testing was conducted using a 1500 bus network, under a variety of loading conditions. Three issues were studied: Sensitivity of OPF solutions with respect to the starting points used in the solution; Accuracy of the active/reactive decoupled approach to OPF solution; Effects of discretization of transformer taps on the OPF solutions.

  5. IEEE Transaction on Power Apparatus and Systems, Vol. PAS-103, No. 12, December 1984 EFFICIENT LARGE-SCALE HYDRO SYSTEM SCHEDULING WITH FORCED SPILL CONDITIONS

    E-Print Network [OSTI]

    Gross, George

    releases from each reservoir and through each power house so as to optimize the total benefit of the hydroIEEE Transaction on Power Apparatus and Systems, Vol. PAS-103, No. 12, December 1984 EFFICIENT LARGE-SCALE HYDRO SYSTEM SCHEDULING WITH FORCED SPILL CONDITIONS Yoshiro Ikura George Gross Systems

  6. Dense, low-power sensor network for three-dimensional thermal characterization of large-scale atria spaces

    E-Print Network [OSTI]

    Gong, Nan-Wei

    We describe the design and implementation of a dense, low-power wireless sensor network for fine-grained three-dimensional thermal characterization of a large open indoor space. To better understand the airflow dynamics ...

  7. Thin power law film flow down an inclined plane: consistent shallow water models and stability under large scale perturbations

    E-Print Network [OSTI]

    Noble, Pascal

    2012-01-01T23:59:59.000Z

    In this paper we derive consistent shallow water equations for thin films of power law fluids down an incline. These models account for the streamwise diffusion of momentum which is important to describe accurately the full dynamic of the thin film flows when instabilities like roll-waves arise. These models are validated through a comparison with Orr Sommerfeld equations for large scale perturbations. We only consider laminar flow for which the boundary layer issued from the interaction of the flow with the bottom surface has an influence all over the transverse direction to the flow. In this case the concept itself of thin film and its relation with long wave asymptotic leads naturally to flow conditions around a uniform free surface Poiseuille flow. The apparent viscosity diverges at the free surface which, in turn, introduces a singularity in the formulation of the Orr-Sommerfeld equations and in the derivation of shallow water models. We remove this singularity by introducing a weaker formulation of Cauc...

  8. 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

    2015-01-01T23:59:59.000Z

    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.

  9. Large power transformers

    SciTech Connect (OSTI)

    Karsai, K.; Kerenyi, D.; Kiss, L.

    1987-01-01T23:59:59.000Z

    The book deals with the following aspects of transformer engineering: general principles governing the function of transformers, iron cores, windings, stray losses caused by stray flux, the insulation of transformers, and the structural parts and accessories. This edition includes the developments in theory and practice on the basis of the authors' experience in design, manufacturing and testing of large transformers. New developments have been particularly extensive in the fields of new magnetic materials, cooling methods, dielectric strength for overvoltages of different types, and stray-load loss problems, which are presented in the book in detail. The many diagrams in the book can be used directly in the design, manufacture and testing of large transformers. In preparing their text, the authors have aimed to satisfy the demand for a work that summarizes the latest experience in development and design of large power transformers.

  10. Solar Power in the Desert: Are the current large-scale solar developments really improving California’s environment?

    E-Print Network [OSTI]

    Allen, Michael F.; McHughen, Alan

    2011-01-01T23:59:59.000Z

    habitat loss from solar and thermal power expansions (Photovoltaic vs Solar Thermal. In: Planetary Stewardship.of the vegetation for thermal solar power units. The net C

  11. LARGE SCALE SIMULATIONS OF THE MECHANCIAL PROPERTIES OF LAYERED TRANSITION METAL TERNARY COMPOUNDS FOR FOSSIL ENERGY POWER SYSTEM APPLICATIONS

    SciTech Connect (OSTI)

    Ching, Wai-Yim

    2014-12-31T23:59:59.000Z

    Advanced materials with applications in extreme conditions such as high temperature, high pressure, and corrosive environments play a critical role in the development of new technologies to significantly improve the performance of different types of power plants. Materials that are currently employed in fossil energy conversion systems are typically the Ni-based alloys and stainless steels that have already reached their ultimate performance limits. Incremental improvements are unlikely to meet the more stringent requirements aimed at increased efficiency and reduce risks while addressing environmental concerns and keeping costs low. Computational studies can lead the way in the search for novel materials or for significant improvements in existing materials that can meet such requirements. Detailed computational studies with sufficient predictive power can provide an atomistic level understanding of the key characteristics that lead to desirable properties. This project focuses on the comprehensive study of a new class of materials called MAX phases, or Mn+1AXn (M = a transition metal, A = Al or other group III, IV, and V elements, X = C or N). The MAX phases are layered transition metal carbides or nitrides with a rare combination of metallic and ceramic properties. Due to their unique structural arrangements and special types of bonding, these thermodynamically stable alloys possess some of the most outstanding properties. We used a genomic approach in screening a large number of potential MAX phases and established a database for 665 viable MAX compounds on the structure, mechanical and electronic properties and investigated the correlations between them. This database if then used as a tool for materials informatics for further exploration of this class of intermetallic compounds.

  12. Large power grid analysis using domain decomposition

    E-Print Network [OSTI]

    Mohanram, Kartik

    -scale linear circuits such as power distribution networks. Simulation results show that by inte- grating the proposed DD framework, existing linear circuit simulators can be extended to handle otherwise intractableLarge power grid analysis using domain decomposition Quming Zhou, Kai Sun, Kartik Mohanram, Danny C

  13. IEEE TRANSACTIONS ON VERY LARGE SCALE INTEGRATION (VLSI) SYSTEMS, VOL. 5, NO. 4, DECEMBER 1997 473 Gate-Level Power and Current Simulation of

    E-Print Network [OSTI]

    Bogliolo, Alessandro

    for design evaluation. A large number of power estimation techniques has been proposed [1]­[4] based, the large number of simulations needed to reach a significant estimate of average power dissipation further and valida- tion. When optimizing for power, several transformations are applied to a circuit to reduce its

  14. Visualization of Large-Scale Distributed Data

    E-Print Network [OSTI]

    Johnson, Andrew

    that are now considered the "lenses" for examining large-scale data. THE LARGE-SCALE DATA VISUALIZATIONVisualization of Large-Scale Distributed Data Jason Leigh1 , Andrew Johnson1 , Luc Renambot1 representation of data and the interactive manipulation and querying of the visualization. Large-scale data

  15. 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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHigh SchoolIn12electron 9 5 - -/e),,sand CERNLandLargefor High Offshore

  16. Microsoft PowerPoint - 2-A-3-OK-Real-Time Data Infrastructure for Large Scale Wind Fleets.pptx

    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHighand Retrievals fromprocess usedGELustre File Systemi di t ff tRPWGReal

  17. 7th International Workshop on Large-Scale Integration of Wind Power and on Transmission Networks for Offshore Wind Farms Models for HLI analysis of power systems with

    E-Print Network [OSTI]

    Bak-Jensen, Birgitte

    for Offshore Wind Farms 1 Models for HLI analysis of power systems with offshore wind farms and distributed power plants, distributed generation and offshore wind farms. Particular attention is paid to the latter]-[4], but there is a lack of models of offshore wind farms, which introduce new issues for their representation, due to some

  18. Measuring Similarity in Large-scale Folksonomies Giovanni Quattrone1

    E-Print Network [OSTI]

    Ferrara, Emilio

    Measuring Similarity in Large-scale Folksonomies Giovanni Quattrone1 , Emilio Ferrara2 , Pasquale by power law distributions of tags, over which commonly used similarity metrics, in- cluding the Jaccard to capture similarity in large-scale folksonomies, that is based on a mutual reinforcement principle: that is

  19. Large-Scale Renewable Energy Guide Webinar

    Broader source: Energy.gov [DOE]

    Webinar introduces the “Large Scale Renewable Energy Guide." The webinar will provide an overview of this important FEMP guide, which describes FEMP's approach to large-scale renewable energy projects and provides guidance to Federal agencies and the private sector on how to develop a common process for large-scale renewable projects.

  20. Conundrum of the Large Scale Streaming

    E-Print Network [OSTI]

    T. M. Malm

    1999-09-12T23:59:59.000Z

    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?

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

    Office of Energy Efficiency and Renewable Energy (EERE)

    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...

  2. Powers of Ten Thousand: Navigating in Large Information Spaces

    E-Print Network [OSTI]

    Powers of Ten Thousand: Navigating in Large Information Spaces Henry Lieberman Media Laboratory large display space, for example, a street map of the entire United States? The traditional solution, on a scale of at least 1 to 10,000. Powers of ten thousand The book and film Powers of Ten [Morrison

  3. 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

  4. Large-scale pool fires 

    E-Print Network [OSTI]

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

    2007-03-29T23:59:59.000Z

    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 ...

  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. 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

  7. Large-Scale Manifold Learning Ameet Talwalkar

    E-Print Network [OSTI]

    California at Irvine, University of

    Large-Scale Manifold Learning Ameet Talwalkar Courant Institute New York, NY ameet on spectral decom- position, we first analyze two approximate spectral decom- position techniques for large-dimensional embeddings for two large face datasets: CMU-PIE (35 thousand faces) and a web dataset (18 million faces). Our

  8. 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 ...

  9. Network Coding for Large Scale Content Distribution

    E-Print Network [OSTI]

    Keinan, Alon

    Network Coding for Large Scale Content Distribution IEEE Infocom 2005 Christos Gkantsidis College propose a new scheme for content distribution of large files that is based on network coding. With network coding, each node of the distribution network is able to generate and transmit encoded blocks

  10. 100 IEEE TRANSACTIONS ON VERY LARGE SCALE INTEGRATION SYSTEMS, VOL. XX, NO. Y, MONTH 2004 A Framework for Energy and Transient Power

    E-Print Network [OSTI]

    Mohanty, Saraju P.

    A Framework for Energy and Transient Power Reduction during Behavioral Synthesis Saraju P. Mohanty, Student applications, the mini- mization of energy, average power, peak power, and peak power differential are equally reduction of the energy and transient power during behavioral synthesis. A new metric called "Cycle Power

  11. Transition from Large-Scale to Small-Scale Dynamo

    SciTech Connect (OSTI)

    Ponty, Y. [Universite de Nice Sophia-Antipolis, CNRS, Observatoire de la Cote d'Azur, B.P. 4229, Nice cedex 04 (France); Plunian, F. [Institut des Sciences de la Terre, CNRS, Universite Joseph Fourier, B.P. 53, 38041 Grenoble cedex 09 (France)

    2011-04-15T23:59:59.000Z

    The dynamo equations are solved numerically with a helical forcing corresponding to the Roberts flow. In the fully turbulent regime the flow behaves as a Roberts flow on long time scales, plus turbulent fluctuations at short time scales. The dynamo onset is controlled by the long time scales of the flow, in agreement with the former Karlsruhe experimental results. The is governed by a generalized {alpha} effect, which includes both the usual {alpha} effect and turbulent diffusion, plus all higher order effects. Beyond the onset we find that this generalized {alpha} effect scales as O(Rm{sup -1}), suggesting the takeover of small-scale dynamo action. This is confirmed by simulations in which dynamo occurs even if the large-scale field is artificially suppressed.

  12. Large-scale simulations of reionization

    SciTech Connect (OSTI)

    Kohler, Katharina; /JILA, Boulder /Fermilab; Gnedin, Nickolay Y.; /Fermilab; Hamilton, Andrew J.S.; /JILA, Boulder

    2005-11-01T23:59:59.000Z

    We use cosmological simulations to explore the large-scale effects of reionization. Since reionization is a process that involves a large dynamic range--from galaxies to rare bright quasars--we need to be able to cover a significant volume of the universe in our simulation without losing the important small scale effects from galaxies. Here we have taken an approach that uses clumping factors derived from small scale simulations to approximate the radiative transfer on the sub-cell scales. Using this technique, we can cover a simulation size up to 1280h{sup -1} Mpc with 10h{sup -1} Mpc cells. This allows us to construct synthetic spectra of quasars similar to observed spectra of SDSS quasars at high redshifts and compare them to the observational data. These spectra can then be analyzed for HII region sizes, the presence of the Gunn-Peterson trough, and the Lyman-{alpha} forest.

  13. Suppression of large-scale perturbations by stiff solid

    E-Print Network [OSTI]

    Vladimír Balek; Matej Škovran

    2015-01-28T23:59:59.000Z

    Evolution of large-scale scalar perturbations in the presence of stiff solid (solid with pressure to energy density ratio > 1/3) is studied. If the solid dominated the dynamics of the universe long enough, the perturbations could end up suppressed by as much as several orders of magnitude. To avoid too steep large-angle power spectrum of CMB, radiation must have prevailed over the solid long enough before recombination.

  14. Suppression of large-scale perturbations by stiff solid

    E-Print Network [OSTI]

    Balek, Vladimír

    2015-01-01T23:59:59.000Z

    Evolution of large-scale scalar perturbations in the presence of stiff solid (solid with pressure to energy density ratio > 1/3) is studied. If the solid dominated the dynamics of the universe long enough, the perturbations could end up suppressed by as much as several orders of magnitude. To avoid too steep large-angle power spectrum of CMB, radiation must have prevailed over the solid long enough before recombination.

  15. Large Scale Periodicity in Redshift Distribution

    E-Print Network [OSTI]

    K. Bajan; M. Biernacka; P. Flin; W. Godlowski; V. Pervushin; A. Zorin

    2004-08-30T23:59:59.000Z

    We review the previous studies of galaxies and quasar redshifts discretisation. We present also the investigations of the large scale periodicity, detected by pencil--beam observations, which revealed 128 (1/h) Mpc period, afterwards confirmed with supercluster studies. We present the theoretical possibility of obtaining such a periodicity using a toy-model. We solved the Kepler problem, i.e. the equation of motion of a particle with null energy moving in the uniform, expanding Universe, decribed by FLRW metrics. It is possible to obtain theoretically the separation between large scale structures similar to the observed one.

  16. Extragalactic jets on subpc and large scales

    E-Print Network [OSTI]

    F. Tavecchio

    2007-08-20T23:59:59.000Z

    Jets can be probed in their innermost regions (d~0.1 pc) through the study of the relativistically-boosted emission of blazars. On the other extreme of spatial scales, the study of structure and dynamics of extragalactic relativistic jets received renewed impulse after the discovery, made by Chandra, of bright X-ray emission from regions at distances larger than hundreds of kpc from the central engine. At both scales it is thus possible to infer some of the basic parameters of the flow (speed, density, magnetic field intensity, power). After a brief review of the available observational evidence, I discuss how the comparison between the physical quantities independently derived at the two scales can be used to shed light on the global dynamics of the jet, from the innermost regions to the hundreds of kpc scale.

  17. Sandia National Laboratories: utility-scale power

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

    utility-scale power Sandia Has Signed a Memorandum of Understanding with Case Western Reserve University On January 28, 2014, in Computational Modeling & Simulation, Energy, Energy...

  18. Computational Diagnostics based on Large Scale Gene

    E-Print Network [OSTI]

    Spang, Rainer

    Computational Diagnostics based on Large Scale Gene Expression Profiles using MCMC Rainer Spang = Data Loadings Singular values Expression levels of super genes, orthogonal matrix #12;)( genessuperall- #12;Given the Few Profiles With Known Diagnosis: · The uncertainty on the right model is high

  19. IEEE TRANSACTIONS ON VERY LARGE SCALE INTEGRATION (VLSI) SYSTEMS, VOL. 6, NO. 4, DECEMBER 1998 707 Algorithm-Based Low-Power Transform Coding

    E-Print Network [OSTI]

    Hung, Shih-Hao

    Algorithm-Based Low-Power Transform Coding Architectures: The Multirate Approach An-Yeu Wu, Member, IEEE to design low-power transform coding architectures, in which the transform coefficients are computed through at the architectural level. We start with the design of low- power multirate discrete cosine transform (DCT

  20. 96 IEEE TRANSACTIONS ON VERY LARGE SCALE INTEGRATION (VLSI) SYSTEMS, VOL. 12, NO. 1, JANUARY 2004 Managing Power Consumption in Networks on Chips

    E-Print Network [OSTI]

    Managing Power Consumption in Networks on Chips Tajana Simunic, Stephen P. Boyd, and Peter Glynn, Member, IEEE Abstract--In this paper, we present a new methodology for managing power consumption of networks-on-chips (NOCs). A power management problem is formulated for the first time using closed-loop control concepts

  1. Materials Science and Materials Chemistry for Large Scale Electrochemi...

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

    Science and Materials Chemistry for Large Scale Electrochemical Energy Storage: From Transportation to Electrical Grid Materials Science and Materials Chemistry for Large Scale...

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

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

    & Large-Scale Uncertainty Quantification for Wind Energy Home Highlights - HPC Computational Fluid Dynamics & Large-Scale Uncertainty Quantification for Wind Energy Previous Next...

  3. 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...

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

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

    Semprius Confidential 1 Overcoming the Barriers to Achieving Large-Scale Production - A Case Study From concept to large-scale production, one manufacturer tells the story and...

  5. (submitted, August 4, 2009) Network-state modulation of power-law frequency-scaling

    E-Print Network [OSTI]

    Bal, Thierry

    of activity distributed across large assemblies. They share in common a power-law frequency-scaling structure density of Vm activity displays a power-law structure at high frequencies, with a frac- tional scaling of correlation, often man- ifested through power-law scaling behaviour. In such systems, the power spectrum

  6. Primordial quantum nonequilibrium and large-scale cosmic anomalies

    E-Print Network [OSTI]

    Samuel Colin; Antony Valentini

    2014-07-31T23:59:59.000Z

    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 could 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.

  7. 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

    2011-07-29T23:59:59.000Z

    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.

  8. A modeling and control framework for operating large-scale electric power systems under present and newly evolving competitive industry structures

    E-Print Network [OSTI]

    Ilic, Marija

    1995-01-01T23:59:59.000Z

    This paper introduces a systematic, structure-based modeling framework for analysis and control of electric power systems for processes evolving over the mid-term and long-term time horizons. Much simpler models than the ...

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

    SciTech Connect (OSTI)

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

    2014-12-12T23:59:59.000Z

    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

  10. Laser Power Meter Large, bright, backlit LCD

    E-Print Network [OSTI]

    Woodall, Jerry M.

    Laser Power Meter FEATURES · Large, bright, backlit LCD display · Digital accuracy with analog-like movement for laser tuning · Works with thermopile and optical sensors · Intuitive button-driven user COMPATIBILITY · PowerMax® thermal sensors · Optical sensors FieldMaxII-TO Coherent Laser Measurement and Control

  11. Challenges in large scale distributed computing: bioinformatics.

    SciTech Connect (OSTI)

    Disz, T.; Kubal, M.; Olson, R.; Overbeek, R.; Stevens, R.; Mathematics and Computer Science; Univ. of Chicago; The Fellowship for the Interpretation of Genomes (FIG)

    2005-01-01T23:59:59.000Z

    The amount of genomic data available for study is increasing at a rate similar to that of Moore's law. This deluge of data is challenging bioinformaticians to develop newer, faster and better algorithms for analysis and examination of this data. The growing availability of large scale computing grids coupled with high-performance networking is challenging computer scientists to develop better, faster methods of exploiting parallelism in these biological computations and deploying them across computing grids. In this paper, we describe two computations that are required to be run frequently and which require large amounts of computing resource to complete in a reasonable time. The data for these computations are very large and the sequential computational time can exceed thousands of hours. We show the importance and relevance of these computations, the nature of the data and parallelism and we show how we are meeting the challenge of efficiently distributing and managing these computations in the SEED project.

  12. Large-scale tidal fields on primordial density perturbations ?

    E-Print Network [OSTI]

    Alejandro Gonzalez

    1997-02-17T23:59:59.000Z

    We calculate the strength of the tidal field produced by the large-scale density field acting on primordial density perturbations in power law models. By analysing changes in the orientation of the deformation tensor, resulted from smoothing the density field on different mass scales, we show that the large-scale tidal field can strongly affect the morphology and orientation of density peaks. The measure of the strength of the tidal field is performed as a function of the distance to the peak and of the spectral index. We detected evidence that two populations of perturbations seems to coexist; one, with a misalignment between the main axes of their inertia and deformation tensors. This would lead to the angular momentum acquisition and morphological changes. For the second population, the perturbations are found nearly aligned in the direction of the tidal field, which would imprint them low angular momentum and which would allow an alignment of structures as those reported between clusters of galaxies in filaments, and between galaxies in clusters. Evidence is presented that the correlation between the orientation of perturbations and the large-scale density field could be a common property of Gaussian density fields with spectral indexes $n < 0$. We argue that alignment of structures can be used to probe the flatness of the spectrum on large scales but it cannot determine the exact value of the spectral index.

  13. Large-scale anisotropy in stably stratified rotating flows

    SciTech Connect (OSTI)

    Marino, Dr. Raffaele [National Center for Atmospheric Research (NCAR); Mininni, Dr. Pablo D. [Universidad de Buenos Aires, Argentina; Rosenberg, Duane L [ORNL; Pouquet, Dr. Annick [National Center for Atmospheric Research (NCAR)

    2014-01-01T23:59:59.000Z

    We present results from direct numerical simulations of the Boussinesq equations in the presence of rotation and/or stratification, both in the vertical direction. The runs are forced isotropically and randomly at small scales and have spatial resolutions of up to $1024^3$ grid points and Reynolds numbers of $\\approx 1000$. We first show that solutions with negative energy flux and inverse cascades develop in rotating turbulence, whether or not stratification is present. However, the purely stratified case is characterized instead by an early-time, highly anisotropic transfer to large scales with almost zero net isotropic energy flux. This is consistent with previous studies that observed the development of vertically sheared horizontal winds, although only at substantially later times. However, and unlike previous works, when sufficient scale separation is allowed between the forcing scale and the domain size, the total energy displays a perpendicular (horizontal) spectrum with power law behavior compatible with $\\sim k_\\perp^{-5/3}$, including in the absence of rotation. In this latter purely stratified case, such a spectrum is the result of a direct cascade of the energy contained in the large-scale horizontal wind, as is evidenced by a strong positive flux of energy in the parallel direction at all scales including the largest resolved scales.

  14. Power Challenges of Large Scale Research Infrastructures: the Square Kilometer Array and Solar Energy Integration; Towards a zero-carbon footprint next generation telescope

    E-Print Network [OSTI]

    Barbosa, Domingos; Ruiz, Valeriano; Silva, Manuel; Verdes-Montenegro, Lourdes; Santander-Vela, Juande; Maia, Dalmiro; Antón, Sonia; van Ardenne, Arnold; Vetter, Matthias; Kramer, Michael; Keller, Reinhard; Pereira, Nuno; Silva, Vitor

    2012-01-01T23:59:59.000Z

    The Square Kilometer Array (SKA) will be the largest Global science project of the next two decades. It will encompass a sensor network dedicated to radioastronomy, covering two continents. It will be constructed in remote areas of South Africa and Australia, spreading over 3000Km, in high solar irradiance latitudes. Solar Power supply is therefore an option to power supply the SKA and contribute to a zero carbon footprint next generation telescope. Here we outline the major characteristics of the SKA and some innovation approaches on thermal solar energy Integration with SKA prototypes.

  15. IEEE TRANSACTIONS ON VERY LARGE SCALE INTEGRATION (VLSI) SYSTEMS, VOL. 6, NO. 4, DECEMBER 1998 707 Algorithm-Based Low-Power Transform Coding

    E-Print Network [OSTI]

    Liu, K. J. Ray

    processing. I. INTRODUCTION DUE to the limited power-supply capability of current battery technology voltage goes down. In [1], the techniques of "parallel processing" and "pipelining" were suggested to compensate the speed penalty, in which a simple comparator circuit was used to demonstrate how parallel

  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. 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 DataDepartment of Energy Your Density Isn't Your Destiny: The FutureComments fromof Energy Automation Worldof EnergyTAGS,Large Scale

  18. Large-scale Intelligent Transporation Systems simulation

    SciTech Connect (OSTI)

    Ewing, T.; Canfield, T.; Hannebutte, U.; Levine, D.; Tentner, A.

    1995-06-01T23:59:59.000Z

    A prototype computer system has been developed which defines a high-level architecture for a large-scale, comprehensive, scalable simulation of an Intelligent Transportation System (ITS) capable of running on massively parallel computers and distributed (networked) computer systems. The prototype includes the modelling of instrumented ``smart`` vehicles with in-vehicle navigation units capable of optimal route planning and Traffic Management Centers (TMC). The TMC has probe vehicle tracking capabilities (display position and attributes of instrumented vehicles), and can provide 2-way interaction with traffic to provide advisories and link times. Both the in-vehicle navigation module and the TMC feature detailed graphical user interfaces to support human-factors studies. The prototype has been developed on a distributed system of networked UNIX computers but is designed to run on ANL`s IBM SP-X parallel computer system for large scale problems. A novel feature of our design is that vehicles will be represented by autonomus computer processes, each with a behavior model which performs independent route selection and reacts to external traffic events much like real vehicles. With this approach, one will be able to take advantage of emerging massively parallel processor (MPP) systems.

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

    Open Energy Info (EERE)

    Scale GSHP as Alternative Energy for American Farmers Geothermal Project Jump to: navigation, search Last modified on July 22, 2011. Project Title Large Scale GSHP as Alternative...

  20. Theoretical Tools for Large Scale Structure

    E-Print Network [OSTI]

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

    1998-10-06T23:59:59.000Z

    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.

  1. Large-Scale Renewable Energy Projects (Larger than 10 MWs) |...

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

    Large-Scale Renewable Energy Projects (Larger than 10 MWs) Large-Scale Renewable Energy Projects (Larger than 10 MWs) Renewable energy projects larger than 10 megawatts (MW) are...

  2. BLM and Forest Service Consider Large-Scale Geothermal Leasing...

    Energy Savers [EERE]

    and Forest Service Consider Large-Scale Geothermal Leasing BLM and Forest Service Consider Large-Scale Geothermal Leasing June 18, 2008 - 4:29pm Addthis In an effort to encourage...

  3. 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...

  4. 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

  5. Optimal Selection of AC Cables for Large Scale Offshore Wind Farms

    E-Print Network [OSTI]

    Hu, Weihao

    Optimal Selection of AC Cables for Large Scale Offshore Wind Farms Peng Hou, Weihao Hu, Zhe Chen@et.aau.dk, whu@iet.aau.dk, zch@iet.aau.dk Abstract--The investment of large scale offshore wind farms is high the operational requirements of the offshore wind farms and the connected power systems. In this paper, a new cost

  6. Fractal large-scale structure from a stochastic scaling law model

    E-Print Network [OSTI]

    S. Capozziello; S. Funkhouser

    2009-03-27T23:59:59.000Z

    A stochastic model relating the parameters of astrophysical structures to the parameters of their granular components is applied to the formation of hierarchical, large-scale structures from galaxies assumed as point-like objects. If the density profile of galaxies on a given scale is described by a power law then the stochastic model leads naturally to a mass function that is proportional to the square of the distance from an occupied point, which corresponds to a two-point correlation function that is inversely proportional to the distance. This result is consistent with observations indicating that galaxies are, on the largest scales, characterized by a fractal distribution with a dimension of order 2 and well-fit with transition to homogeneity at cosmological scales.

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

    E-Print Network [OSTI]

    research on challenges facing the electric power industry and educating the next generation of powerU.S. Energy Infrastructure Investment: Large-Scale Integrated Smart Grid Solutions with High Penetration of Renewable Resources, Dispersed Generation, and Customer Participation White Paper Power Systems

  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 optimal power flow

    SciTech Connect (OSTI)

    Papalexopoulos, A.D.; Imparato, C.F.; Wu, F.F.

    1989-05-01T23:59:59.000Z

    Extensive numerical testing of a second-order OPF solution method was conducted using a 1500 bus network under various loading conditions. The results show that (i) properly implemented second-order OPF solution methods are robust with respect to different starting points, (ii) the decoupled OPF solution is expected to be close to the full OPF solution, and (iii) the effects of discretization of load tap changing (LTC) transformer taps are very small and usually negligible.

  10. Superconducting materials for large scale applications

    SciTech Connect (OSTI)

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

    2004-05-06T23:59:59.000Z

    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.

  11. Inflationary tensor fossils in large-scale structure

    E-Print Network [OSTI]

    Emanuela Dimastrogiovanni; Matteo Fasiello; Donghui Jeong; Marc Kamionkowski

    2014-07-30T23:59:59.000Z

    Inflation models make specific predictions for a tensor-scalar-scalar three-point correlation, or bispectrum, between one gravitational-wave (tensor) mode and two density-perturbation (scalar) modes. This tensor-scalar-scalar correlation leads to a local power quadrupole, an apparent departure from statistical isotropy in our Universe, as well as characteristic four-point correlations in the current mass distribution in the Universe. So far, the predictions for these observables have been worked out only for single-clock models in which certain consistency conditions between the tensor-scalar-scalar correlation and tensor and scalar power spectra are satisfied. Here we review the requirements on inflation models for these consistency conditions to be satisfied. We then consider several examples of inflation models, such as non-attractor and solid inflation models, in which these conditions are put to the test. In solid inflation the simplest consistency conditions are already violated whilst in the non-attractor model we find that, contrary to the standard scenario, the tensor-scalar-scalar correlator probes directly relevant model-dependent information. We work out the predictions for observables in these models. For non-attractor inflation we find an apparent local quadrupolar departure from statistical isotropy in large-scale structure but that this power quadrupole decreases very rapidly at smaller scales. The consistency of the CMB quadrupole with statistical isotropy then constrains the distance scale that corresponds to the transition from the non-attractor to attractor phase of inflation to be larger than the currently observable horizon. Solid inflation predicts clustering fossils signatures in the current galaxy distribution that may be large enough to be detectable with forthcoming, and possibly even current, galaxy surveys.

  12. Probing the imprint of interacting dark energy on very large scales

    E-Print Network [OSTI]

    Duniya, Didam; Maartens, Roy

    2015-01-01T23:59:59.000Z

    The observed galaxy power spectrum acquires relativistic corrections from lightcone effects, and these corrections grow on very large scales. Future galaxy surveys in optical, infrared and radio bands will probe increasingly large wavelength modes and reach higher redshifts. In order to exploit the new data on large scales, an accurate analysis requires inclusion of the relativistic effects. This is especially the case for primordial non-Gaussianity and for extending tests of dark energy models to horizon scales. Here we investigate the latter, focusing on models where the dark energy interacts non-gravitationally with dark matter. Interaction in the dark sector can also lead to large-scale deviations in the power spectrum. If the relativistic effects are ignored, the imprint of interacting dark energy will be incorrectly identified and thus lead to a bias in constraints on interacting dark energy on very large scales.

  13. SPEAR3 LARGE DC MAGNET POWER SUPPLIES

    SciTech Connect (OSTI)

    de Lira, A

    2004-06-23T23:59:59.000Z

    The Stanford Synchrotron Radiation Laboratory (SSRL) has successfully commissioned SPEAR3, its newly upgraded 3-GeV synchrotron light source. First stored beam occurred December 15, 2003 and 100mA operation was reached on January 20, 2004. This paper describes the specification, design, and performance of the SPEAR3 DC magnet large power supplies (LGPS) that consist of tightly-regulated (better than {+-}10 ppm) current sources ranging from 100A to 225A and output powers ranging from 70kW to 135kW. A total of 6 LGPS are in successful operation and are used to power strings of quadrupoles and sextupoles. The LGPS are isolated by a delta/delta-wye 60Hz step-down transformer that provides power to 2 series-connected chopper stages operating phase-shifted at a switching frequency of 18-kHz to provide for fast output response and high efficiency. Also described are outside procurement aspects, installation, in-house testing, and operation of the power supplies.

  14. Skewness and Kurtosis in Large-Scale Cosmic Fields

    E-Print Network [OSTI]

    F. Bernardeau

    1993-12-13T23:59:59.000Z

    In this paper, I present the calculation of the third and fourth moments of both the distribution function of the large--scale density and the large--scale divergence of the velocity field, $\\theta$. These calculations are made by the mean of perturbative calculations assuming Gaussian initial conditions and are expected to be valid in the linear or quasi linear regime. The moments are derived for a top--hat window function and for any cosmological parameters $\\Omega$ and $\\Lambda$. It turns out that the dependence with $\\Lambda$ is always very weak whereas the moments of the distribution function of the divergence are strongly dependent on $\\Omega$. A method to measure $\\Omega$ using the skewness of this field has already been presented by Bernardeau et al. (1993). I show here that the simultaneous measurement of the skewness and the kurtosis allows to test the validity of the gravitational instability scenario hypothesis. Indeed there is a combination of the first three moments of $\\theta$ that is almost independent of the cosmological parameters $\\Omega$ and $\\Lambda$, $${(-3^2) \\over ^2}\\approx 1.5,$$ (the value quoted is valid when the index of the power spectrum at the filtering scale is close to -1) so that any cosmic velocity field created by gravitational instabilities should verify such a property.

  15. Large-Scale Decentralized Unit Commitment

    E-Print Network [OSTI]

    2015-04-10T23:59:59.000Z

    Preprint submitted to Int. J. of Electrical Power & Energy Systems. April 10, 2015. Page 2. A compelling alternative is to decentralize, rather than centralize, these.

  16. Large-Scale in the United

    E-Print Network [OSTI]

    Sustainable Power Consulting Bureau of Ocean Energy Management, Regulation and Enforcement University of Delaware University of Massachusetts Rutgers University Cape Wind Associates Union of Concerned Scientists

  17. Fractal Approach to Large-Scale Galaxy Distribution

    E-Print Network [OSTI]

    Yurij Baryshev; Pekka Teerikorpi

    2005-05-10T23:59:59.000Z

    We present a review of the history and the present state of the fractal approach to the large-scale distribution of galaxies. Angular correlation function was used as a general instrument for the structure analysis. It was realized later that a normalization condition for the reduced correlation function estimator results in distorted values for both R_{hom} and fractal dimension D. Moreover, according to a theorem on projections of fractals, galaxy angular catalogues can not be used for detecting a structure with the fractal dimension D>2. For this 3-d maps are required, and indeed modern extensive redshift-based 3-d maps have revealed the ``hidden'' fractal dimension of about 2, and have confirmed superclustering at scales even up to 500 Mpc (e.g. the Sloan Great Wall). On scales, where the fractal analysis is possible in completely embedded spheres, a power--law density field has been found. The fractal dimension D =2.2 +- 0.2 was directly obtained from 3-d maps and R_{hom} has expanded from 10 Mpc to scales approaching 100 Mpc. In concordance with the 3-d map results, modern all sky galaxy counts in the interval 10^m - 15^m give a 0.44m-law which corresponds to D=2.2 within a radius of 100h^{-1}_{100} Mpc. We emphasize that the fractal mass--radius law of galaxy clustering has become a key phenomenon in observational cosmology.

  18. 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 ...

  19. DECOMPOSITION OF LARGE-SCALE STOCHASTIC OPTIMAL ...

    E-Print Network [OSTI]

    2009-03-06T23:59:59.000Z

    consider dynamical systems that can be divided into small-scale independent .... realizations of the noise process are identical up to time t, then the same ..... without our approximation, the algorithm would build primal iterates that converge ...

  20. Large scale prediction models and algorithms

    E-Print Network [OSTI]

    Monsch, Matthieu (Matthieu Frederic)

    2013-01-01T23:59:59.000Z

    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. ...

  1. Hydranet: network support for scaling of large scale servic es

    E-Print Network [OSTI]

    Chawla, Hamesh

    1998-01-01T23:59:59.000Z

    With the explosive growth of demand for services on the Internet, the networking infrastructure (routers 7 protocols, servers) is under considerable stress. Mechanisms are needed for current and future IP services to scale in a client transparent...

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

    E-Print Network [OSTI]

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

    2015-03-29T23:59:59.000Z

    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 ($e_{\\zeta}$).

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

    E-Print Network [OSTI]

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

    2015-01-01T23:59:59.000Z

    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 ($e_{\\zeta}$).

  4. Strategies to Finance Large-Scale Deployment of Renewable Energy...

    Open Energy Info (EERE)

    Strategies to Finance Large-Scale Deployment of Renewable Energy Projects: An Economic Development and Infrastructure Approach Jump to: navigation, search Tool Summary LAUNCH TOOL...

  5. Efficient random coordinate descent algorithms for large-scale ...

    E-Print Network [OSTI]

    2013-05-04T23:59:59.000Z

    (will be inserted by the editor). Efficient random coordinate descent algorithms for large-scale structured nonconvex optimization. Andrei Patrascu · Ion Necoara.

  6. Optimization Online - Large-Scale Linear Programming Techniques ...

    E-Print Network [OSTI]

    Michael Wagner

    2002-02-12T23:59:59.000Z

    Feb 12, 2002 ... Large-Scale Linear Programming Techniques for the Design of Protein Folding Potentials. Michael Wagner (mwagner ***at*** odu.edu)

  7. ORNL, CINCINNATI partner to develop commercial large-scale additive...

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

    Laboratory 865-574-7308 ORNL, CINCINNATI partner to develop commercial large-scale additive manufacturing system (From left) David Danielson, the Energy Department's...

  8. A Distribution Oblivious Scalable Approach for Large-Scale Scientific...

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

    Distribution Oblivious Scalable Approach for Large-Scale Scientific Data Processing June 12, 2013 Problem Statement: Runtimes of scientific data processing (SDP) methods vary...

  9. Advancing Cellulosic Ethanol for Large Scale Sustainable Transportation

    E-Print Network [OSTI]

    Wyman, C

    2007-01-01T23:59:59.000Z

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

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

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

    Ron Walli Communications 865.576.0226 ORNL demonstrates first large-scale graphene composite fabrication ORNL's ultrastrong graphene features layers of graphene and polymers and is...

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

    E-Print Network [OSTI]

    Theodore Lambert

    2004-08-01T23:59:59.000Z

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

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

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

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

  13. Solving large scale polynomial convex problems on \\ell_1/nuclear ...

    E-Print Network [OSTI]

    Aharon Ben-Tal

    2012-10-24T23:59:59.000Z

    Oct 24, 2012 ... Solving large scale polynomial convex problems on \\ell_1/nuclear norm balls by randomized first-order algorithms. Aharon Ben-Tal (abental ...

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

    E-Print Network [OSTI]

    Kolter, J. Zico

    -Gaussian case using the copula transform. On a wind power forecasting task, we show that this probabilisticLarge-scale Probabilistic Forecasting in Energy Systems using Sparse Gaussian Conditional Random high-dimensional conditional Gaussian distributions to forecasting wind power and extend it to the non

  15. Studying the energy efficiency of large-scale computer systems requires models of the relationship

    E-Print Network [OSTI]

    Rivoire, Suzanne

    Abstract Studying the energy efficiency of large-scale computer systems requires models-node clusters using embedded, laptop, desktop, and server processors. These results demonstrate the need usage and power consumption. Therefore, a substantial body of literature models system-level power

  16. Large-Scale Wind Training Program

    SciTech Connect (OSTI)

    Porter, Richard L. [Hudson Valley Community College

    2013-07-01T23:59:59.000Z

    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.

  17. Management of Large-Scale International

    E-Print Network [OSTI]

    . Shore C. Strawbridge G. Zollo Oak Ridge National Laboratory, USA Savannah River National Laboratory, USA River National Laboratory December 3, 2009 Fusion Power Associates Thirty-year Anniversary Meeting Oak Ridge National Laboratory, USA University of Naples Federico, Secundo, Italy #12;Project

  18. Measuring and tuning energy efficiency on large scale high performance computing platforms.

    SciTech Connect (OSTI)

    Laros, James H., III

    2011-08-01T23:59:59.000Z

    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.

  19. 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

  20. Attack Containment Framework for Large-Scale Critical Infrastructures

    E-Print Network [OSTI]

    Nahrstedt, Klara

    Attack Containment Framework for Large-Scale Critical Infrastructures Hoang Nguyen Department-- We present an attack containment framework against value-changing attacks in large-scale critical structure, called attack container, which captures the trust behavior of a group of nodes and assists

  1. Scalable Cache Memory Design for Large-Scale SMT Architectures

    E-Print Network [OSTI]

    Mudawa, Muhamed F.

    Scalable Cache Memory Design for Large-Scale SMT Architectures Muhamed F. Mudawar Computer Science in existing SMT and superscalar processors is optimized for latency, but not for bandwidth. The size of the L1 is not suitable for future large-scale SMT processors, which will demand high bandwidth instruction and data

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

    E-Print Network [OSTI]

    Claudin, Philippe

    that cannot be readily explained by examining the dynamics at the scale of single dunes, or by appealingModeling emergent large-scale structures of barchan dune fields S. Worman , A.B. Murray , R for a range of field-scale phenomena including isolated patches of dunes and heterogeneous arrangements

  3. Large Scale Weather Control Using Nuclear Reactors

    E-Print Network [OSTI]

    Singh-Modgil, M

    2002-01-01T23:59:59.000Z

    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.

  4. Large Scale Weather Control Using Nuclear Reactors

    E-Print Network [OSTI]

    Moninder Singh Modgil

    2002-10-02T23:59:59.000Z

    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.

  5. Large-scale magnetic fields in the inflationary universe

    E-Print Network [OSTI]

    Kazuharu Bamba; Misao Sasaki

    2006-11-22T23:59:59.000Z

    The generation of large-scale magnetic fields is studied in inflationary cosmology. We consider the violation of the conformal invariance of the Maxwell field by dilatonic as well as non-minimal gravitational couplings. We derive a general formula for the spectrum of large-scale magnetic fields for a general form of the coupling term and the formula for the spectral index. The result tells us clearly the (necessary) condition for the generation of magnetic fields with sufficiently large amplitude.

  6. Methodology for Scaling Fusion Power Plant Availability

    SciTech Connect (OSTI)

    Lester M. Waganer

    2011-01-04T23:59:59.000Z

    Normally in the U.S. fusion power plant conceptual design studies, the development of the plant availability and the plant capital and operating costs makes the implicit assumption that the plant is a 10th of a kind fusion power plant. This is in keeping with the DOE guidelines published in the 1970s, the PNL report1, "Fusion Reactor Design Studies - Standard Accounts for Cost Estimates. This assumption specifically defines the level of the industry and technology maturity and eliminates the need to define the necessary research and development efforts and costs to construct a one of a kind or the first of a kind power plant. It also assumes all the "teething" problems have been solved and the plant can operate in the manner intended. The plant availability analysis assumes all maintenance actions have been refined and optimized by the operation of the prior nine or so plants. The actions are defined to be as quick and efficient as possible. This study will present a methodology to enable estimation of the availability of the one of a kind (one OAK) plant or first of a kind (1st OAK) plant. To clarify, one of the OAK facilities might be the pilot plant or the demo plant that is prototypical of the next generation power plant, but it is not a full-scale fusion power plant with all fully validated "mature" subsystems. The first OAK facility is truly the first commercial plant of a common design that represents the next generation plant design. However, its subsystems, maintenance equipment and procedures will continue to be refined to achieve the goals for the 10th OAK power plant.

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

    SciTech Connect (OSTI)

    Josephson, Gary B.; Westsik, Joseph H.

    2011-10-23T23:59:59.000Z

    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.

  8. LargeScale FPGAbased Convolutional Networks Clement Farabet 1

    E-Print Network [OSTI]

    LeCun, Yann

    Large­Scale FPGA­based Convolutional Networks Clâ??ement Farabet 1 , Yann LeCun 1 , Koray Kavukcuoglu, Yale University, New Haven, USA Chapter in Machine Learning on Very Large Data Sets, edited by Ron Bekkerman, Mikhail Bilenko, and John Langford, Cambridge University Press, 2011. May 2, 2011 1 #12; Large

  9. Stabilization of Large Scale Structure by Adhesive Gravitational Clustering

    E-Print Network [OSTI]

    Thomas Buchert

    1999-08-13T23:59:59.000Z

    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.

  10. Relating spontaneous BOLD oscillatory power scale to whole-brain functional and structural organization

    E-Print Network [OSTI]

    Apkarian, A. Vania

    at every voxel. The series were transformed to frequency domain and power spectrum plotted on a log of each voxel (Panel 1a). Large a = more power in low frequency BOLD. · Functional linRelating spontaneous BOLD oscillatory power scale to whole-brain functional and structural

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

    E-Print Network [OSTI]

    Palmer, Nathan Patrick

    2011-01-01T23:59:59.000Z

    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 ...

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

    E-Print Network [OSTI]

    Hum, Philip W. (Philip Wing-Jung)

    2006-01-01T23:59:59.000Z

    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 ...

  13. Parallel Stochastic Gradient Algorithms for Large-Scale Matrix ...

    E-Print Network [OSTI]

    2013-03-21T23:59:59.000Z

    parallel implementation that admits a speed-up nearly proportional to the ... On large-scale matrix completion tasks, Jellyfish is orders of magnitude more ...... get a consistent build of NNLS with mex optimizations at the time of this submission.

  14. Interference management techniques in large-scale wireless networks 

    E-Print Network [OSTI]

    Luo, Yi

    2015-06-29T23:59:59.000Z

    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 ...

  15. Large-scale simulator for global data infrastructure optimization

    E-Print Network [OSTI]

    Herrero-López, Sergio

    2012-01-01T23:59:59.000Z

    Companies depend on information systems to control their operations. During the last decade, Information Technology (IT) infrastructures have grown in scale and complexity. Any large company runs many enterprise applications ...

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

    E-Print Network [OSTI]

    Yeh, Po Hung

    2010-10-12T23:59:59.000Z

    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 ...

  17. Chemical engineers design, control and optimize large-scale chemical,

    E-Print Network [OSTI]

    Rohs, Remo

    , Biochemical, Environmental, Petroleum Engineering and Nantoechnology. CHEMICAL&MATERIALSSCIENCE CHE OVERVIEW of Science 131 units · Chemical Engineering (Petroleum) Bachelor of Science 136 units · Chemical Engineering38 Chemical engineers design, control and optimize large-scale chemical, physicochemical

  18. Infrastructure for large-scale tests in marine autonomy

    E-Print Network [OSTI]

    Hummel, Robert A. (Robert Andrew)

    2012-01-01T23:59:59.000Z

    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 ...

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

    E-Print Network [OSTI]

    Kalligeros, Konstantinos C., 1976-

    2006-01-01T23:59:59.000Z

    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 ...

  20. Lessons Learned: Planning and Operating Power Systems with Large

    E-Print Network [OSTI]

    Lessons Learned: Planning and Operating Power Systems with Large Amounts of Renewable Energy agency thereof. #12;Lessons Learned: Planning and Operating Power Systems with Large Amounts of Renewable to their systems powered by as-available renewable energy sources (primarily wind and solar). The Big Island also

  1. Streamflow forecasting for large-scale hydrologic systems

    E-Print Network [OSTI]

    Awwad, Haitham Munir

    1991-01-01T23:59:59.000Z

    STREAMFLOW FORECASTING FOR LARGE-SCALE HYDROLOGIC SYSTEMS A Thesis by HAITHAM MUNIR AWWAD Submitted to the Office of Graduate Studies of Texas AkM University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE May... 1991 Major Subject: Civil Engineering STREAMFLOW FORECASTING FOR LARGE-SCALE HYDROLOGIC SYSTEMS A Thesis by HAITHAM MUNIR AWWAD Approved as to style and content by: uan B. Valdes (Chair of Committee) alph A. Wurbs (Member) Marshall J. Mc...

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

    E-Print Network [OSTI]

    Stevens, Richard J A M

    2014-01-01T23:59:59.000Z

    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...

  3. 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

  4. Large Scale Spatial Augmented Reality for Design and Prototyping

    E-Print Network [OSTI]

    Thomas, Bruce

    Chapter 10 Large Scale Spatial Augmented Reality for Design and Prototyping Michael R. Marner, Ross Augmented Reality allows the appearance of physical objects to be transformed using projected light commercial and personal use. This chapter explores how large Spatial Augmented Reality systems can be applied

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

    SciTech Connect (OSTI)

    Bird, L.; Milligan, M.

    2012-06-01T23:59:59.000Z

    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.

  6. Large scale properties in turbulent spherically symmetric accretion

    E-Print Network [OSTI]

    Arnab K. Ray; J. K. Bhattacharjee

    2005-10-05T23:59:59.000Z

    The role of turbulence in a spherically symmetric accreting system has been studied on very large spatial scales of the system. This is also a highly subsonic flow region and here the accreting fluid has been treated as nearly incompressible. It has been shown here that the coupling of the mean flow and the turbulent fluctuations, gives rise to a scaling relation for an effective "turbulent viscosity". This in turn leads to a dynamic scaling for sound propagation in the accretion process. As a consequence of this scaling, the sonic horizon of the transonic inflow solution is shifted inwards, in comparison with the inviscid flow.

  7. QER- Comment of Large Public Power Council 2

    Broader source: Energy.gov [DOE]

    Attached please find comments by the Large Public Power Council for the record regarding the April 11th QER meeting.

  8. QER- Comment of Large Public Power Council 1

    Broader source: Energy.gov [DOE]

    Attached are the Comments of the Large Public Power Council on the QER. Please feel to contact me if you have any questions.

  9. Prototype Vector Machine for Large Scale Semi-Supervised Learning

    SciTech Connect (OSTI)

    Zhang, Kai; Kwok, James T.; Parvin, Bahram

    2009-04-29T23:59:59.000Z

    Practicaldataminingrarelyfalls exactlyinto the supervisedlearning scenario. Rather, the growing amount of unlabeled data poses a big challenge to large-scale semi-supervised learning (SSL). We note that the computationalintensivenessofgraph-based SSLarises largely from the manifold or graph regularization, which in turn lead to large models that are dificult to handle. To alleviate this, we proposed the prototype vector machine (PVM), a highlyscalable,graph-based algorithm for large-scale SSL. Our key innovation is the use of"prototypes vectors" for effcient approximation on both the graph-based regularizer and model representation. The choice of prototypes are grounded upon two important criteria: they not only perform effective low-rank approximation of the kernel matrix, but also span a model suffering the minimum information loss compared with the complete model. We demonstrate encouraging performance and appealing scaling properties of the PVM on a number of machine learning benchmark data sets.

  10. Toward Improved Support for Loosely Coupled Large Scale Simulation Workflows

    SciTech Connect (OSTI)

    Boehm, Swen [ORNL] [ORNL; Elwasif, Wael R [ORNL] [ORNL; Naughton, III, Thomas J [ORNL; Vallee, Geoffroy R [ORNL] [ORNL

    2014-01-01T23:59:59.000Z

    High-performance computing (HPC) workloads are increasingly leveraging loosely coupled large scale simula- tions. Unfortunately, most large-scale HPC platforms, including Cray/ALPS environments, are designed for the execution of long-running jobs based on coarse-grained launch capabilities (e.g., one MPI rank per core on all allocated compute nodes). This assumption limits capability-class workload campaigns that require large numbers of discrete or loosely coupled simulations, and where time-to-solution is an untenable pacing issue. This paper describes the challenges related to the support of fine-grained launch capabilities that are necessary for the execution of loosely coupled large scale simulations on Cray/ALPS platforms. More precisely, we present the details of an enhanced runtime system to support this use case, and report on initial results from early testing on systems at Oak Ridge National Laboratory.

  11. 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 energy in Europe? · Distribution of wind energy all over Europe leads to smoothing of the wind power energy can easily supply up to ~20% of the European demand. At this stage, · Less than 13% of the wind

  12. @scale: Insights from a Large, Long-Lived Appliance Stephen Dawson-Haggerty

    E-Print Network [OSTI]

    Culler, David E.

    Design, Measurement, Performance Keywords Energy, Audit, Building, Power, Wireless, Sensor Network 1@scale: Insights from a Large, Long-Lived Appliance Energy WSN Stephen Dawson-Haggerty , Steven Lanzisera , Jay Taneja , Richard Brown , and David Culler Computer Science Division Environmental Energy

  13. China's changing landscape during the 1990s: Large-scale land transformations estimated with satellite data

    E-Print Network [OSTI]

    China's changing landscape during the 1990s: Large-scale land transformations estimated January 2005. [1] Land-cover changes in China are being powered by demand for food for its growing increased by 2.99 million hectares and urban areas increased by 0.82 million hectares. In northern China

  14. 232 IEEE TRANSACTIONS ON VERY LARGE SCALE INTEGRATION (VLSI) SYSTEMS, VOL. 6, NO. 2, JUNE 1998 Short Papers

    E-Print Network [OSTI]

    Boemo, Eduardo

    232 IEEE TRANSACTIONS ON VERY LARGE SCALE INTEGRATION (VLSI) SYSTEMS, VOL. 6, NO. 2, JUNE 1998, and moderate power consumption. The construction of wave pipelines is benefited by the use of gates and buffers, low-power de- sign, performance tradeoffs. I. INTRODUCTION PIPELINING is one of the most powerful

  15. Effect of Large Dynamic Loads on Interconnected Power Systems with Power Oscillation Damping

    E-Print Network [OSTI]

    Pota, Himanshu Roy

    Effect of Large Dynamic Loads on Interconnected Power Systems with Power Oscillation Damping.hossain and H.Pota)@adfa.edu.au Abstract--Power systems are composed of dynamic loads. In this paper presents an analysis to investigate the effects of large dynamic loads on interconnected power systems

  16. 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.

    2010-12-01T23:59:59.000Z

    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.

  17. Large-scale simulations of complex physical systems

    SciTech Connect (OSTI)

    Belic, A. [Scientific Computing Laboratory, Institute of Physics, Pregrevica 118, 11080 Belgrade (Serbia and Montenegro)

    2007-04-23T23:59:59.000Z

    Scientific computing has become a tool as vital as experimentation and theory for dealing with scientific challenges of the twenty-first century. Large scale simulations and modelling serve as heuristic tools in a broad problem-solving process. High-performance computing facilities make possible the first step in this process - a view of new and previously inaccessible domains in science and the building up of intuition regarding the new phenomenology. The final goal of this process is to translate this newly found intuition into better algorithms and new analytical results.In this presentation we give an outline of the research themes pursued at the Scientific Computing Laboratory of the Institute of Physics in Belgrade regarding large-scale simulations of complex classical and quantum physical systems, and present recent results obtained in the large-scale simulations of granular materials and path integrals.

  18. No Large Scale Curvature Perturbations during Waterfall of Hybrid Inflation

    E-Print Network [OSTI]

    Ali Akbar Abolhasani; Hassan Firouzjahi

    2011-01-18T23:59:59.000Z

    In this paper the possibility of generating large scale curvature perturbations induced from the entropic perturbations during the waterfall phase transition of standard hybrid inflation model is studied. We show that whether or not appreciable amounts of large scale curvature perturbations are produced during the waterfall phase transition depend crucially on the competition between the classical and the quantum mechanical back-reactions to terminate inflation. If one considers only the classical evolution of the system we show that the highly blue-tilted entropy perturbations induce highly blue-tilted large scale curvature perturbations during the waterfall phase transition which dominate over the original adiabatic curvature perturbations. However, we show that the quantum back-reactions of the waterfall field inhomogeneities produced during the phase transition dominate completely over the classical back-reactions. The cumulative quantum back-reactions of very small scales tachyonic modes terminate inflation very efficiently and shut off the curvature perturbations evolution during the waterfall phase transition. This indicates that the standard hybrid inflation model is safe under large scale curvature perturbations during the waterfall phase transition.

  19. Scaling self-organizing maps to model large cortical networks

    E-Print Network [OSTI]

    2004-01-01T23:59:59.000Z

    Self-organizing computational models with specific intracortical connections can explain many functional features of visual cortex, such as topographic orientation and ocular dominance maps. However, due to their computational requirements, it is difficult to use such detailed models to study large-scale phenomena like object segmentation and binding, object recognition, tilt illusions, optic flow, and fovea periphery interaction. This paper introduces two techniques that make large simulations practical. First, a set of general linear scaling equations for the RF-LISSOM self-organizing model is derived and shown to result in quantitatively equivalent maps over a wide range of simulation sizes. This capability makes it possible to debug small simulations and then scale them up to larger simulations only when needed. The scaling equations also facilitate the comparison of biological maps and parameters between individuals and species with different brain region sizes. Second, the equations are combined into a new growing map method called GLISSOM, which dramatically reduces the memory and computational requirements of large self-organizing networks. With GLISSOM it should be possible to simulate all of human V1 at the single-column level using existing supercomputers, making detailed computational study of large-scale phenomena possible.

  20. Large-Scale Algal Cultivation, Harvesting and Downstream Processing Workshop

    Broader source: Energy.gov [DOE]

    ATP3 (Algae Testbed Public-Private Partnership) is hosting the Large-Scale Algal Cultivation, Harvesting and Downstream Processing Workshop on November 2–6, 2015, at the Arizona Center for Algae Technology and Innovation in Mesa, Arizona. Topics will include practical applications of growing and managing microalgal cultures at production scale (such as methods for handling cultures, screening strains for desirable characteristics, identifying and mitigating contaminants, scaling up cultures for outdoor growth, harvesting and processing technologies, and the analysis of lipids, proteins, and carbohydrates). Related training will include hands-on laboratory and field opportunities.

  1. Proceedings of a Topical Meeting On Small Scale Geothermal Power Plants and Geothermal Power Plant Projects

    SciTech Connect (OSTI)

    None

    1986-02-12T23:59:59.000Z

    These proceedings describe the workshop of the Topical Meeting on Small Scale Geothermal Power Plants and Geothermal Power Plant Projects. The projects covered include binary power plants, rotary separator, screw expander power plants, modular wellhead power plants, inflow turbines, and the EPRI hybrid power system. Active projects versus geothermal power projects were described. In addition, a simple approach to estimating effects of fluid deliverability on geothermal power cost is described starting on page 119. (DJE-2005)

  2. The Column Density Distribution of the Lyman-Alpha Forest: A Measure of Small Scale Power

    E-Print Network [OSTI]

    Lam Hui; Nickolay Y. Gnedin; Yu Zhang

    1997-02-19T23:59:59.000Z

    Absorption lines in the Lyman-alpha forest can be thought of as peaks in neutral hydrogen density along lines of sight. The column density distribution (the number density of absorption lines as a function of column density) is then a statistic of density peaks, which contains information about the underlying power spectrum. In particular, we show that the slope of the distribution provides a measure of power on scales smaller than those probed by studies of present-day large scale structure.

  3. Computing GIC in large power systems

    SciTech Connect (OSTI)

    Prabhakara, F.S. (Power Technologies, Inc., Schenectady, NY (United States)); Ponder, J.Z.; Towle, J.N.

    1992-01-01T23:59:59.000Z

    On March 13, 1989, a severe geomagnetic disturbance affected power and communications systems in the North American continent. Since the geomagnetic disturbance, several other disturbances have occurred. The Pennsylvania, New Jersey, and Maryland (PJM) Interconnection system, its member companies, and some of the neighboring utilities experienced the geomagnetic induced current (GIC) effects on March 13, 1989, as well as during the subsequent geomagnetic disturbances. As a result, considerable effort is being focused on measurement, analysis, and mitigation of GIC in the PJM system. Some of the analytical and computational work completed so far is summarized in this article.

  4. Large Scale Simulation of Tor: Modelling a Global Passive Adversary

    E-Print Network [OSTI]

    Blott, Stephen

    . Implementing global passive adversary attacks on currently deployed low latency anonymous networks designs have been developed which attempt to apply mixes to low latency traffic. The most widelyLarge Scale Simulation of Tor: Modelling a Global Passive Adversary Gavin O' Gorman and Stephen

  5. Materialized community ground models for large-scale earthquake simulation

    E-Print Network [OSTI]

    Shewchuk, Jonathan

    Materialized community ground models for large-scale earthquake simulation Steven W. Schlosser to ground motion sim- ulations, in which ground model datasets are fully materi- alized into octress stored as a service techniques in which scientific computation and storage services become more tightly intertwined. 1

  6. ORNL 2013-G00021/tcc Large Scale Graphene Production

    E-Print Network [OSTI]

    ORNL 2013-G00021/tcc 02.2013 Large Scale Graphene Production UT-B ID 201102606 Technology Summary Graphene is an emerging one-atom-thick carbon material which has the potential for a wide range research, graphene has quickly attained the status of a wonder nanomaterial and continued to draw

  7. Seamlessly Integrating Software & Hardware Modelling for Large-Scale Systems

    E-Print Network [OSTI]

    Zhao, Yuxiao

    Engineering, with the math- ematical modelling approach, Modelica, to address the software/hardware integration problem. The environment and hardware components are modelled in Modelica and integrated software-hardware codesign, large-scale sys- tems, Behavior Engineering, Modelica. 1. Introduction

  8. Determining Identifiable Parameterizations for Large-scale Physical Models in

    E-Print Network [OSTI]

    Van den Hof, Paul

    /Novem (Dutch Government). ISAPP (Integrated Systems Approach to Petroleum Production) is a joint project as applied in the field of petroleum reservoir engineering. Starting from a large-scale, physics-based model models in petroleum reservoir engineering. Petroleum reservoir engineering is concerned with maximizing

  9. Large-Scale Linear Programming Techniques for the Design of ...

    E-Print Network [OSTI]

    2002-02-05T23:59:59.000Z

    Feb 5, 2002 ... Page 1 ... We present large-scale optimization techniques to model the energy function that underlies the folding process of ..... which we will refer to from now on, we get a system. AT y ? b, ... Although we don't want to rule out that a so- ..... What we believe is interesting in this context is that the results from.

  10. Spatial Energy Balancing in Large-scale Wireless Multihop Networks

    E-Print Network [OSTI]

    de Veciana, Gustavo

    Spatial Energy Balancing in Large-scale Wireless Multihop Networks Seung Jun Baek and Gustavo de is on optimizing trade-offs between the energy cost of spreading traffic and the improved spatial balance of energy. We propose a parameterized family of energy balancing strategies for grids and approximate

  11. Materials Availability Expands the Opportunity for Large-Scale

    E-Print Network [OSTI]

    Kammen, Daniel M.

    Materials Availability Expands the Opportunity for Large-Scale Photovoltaics Deployment C Y R U S W of Chemistry, University of California, Berkeley, California 94720, Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, Department of Materials Science and Engineering

  12. On solving large scale polynomial convex problems by randomized ...

    E-Print Network [OSTI]

    2013-03-24T23:59:59.000Z

    Mar 24, 2013 ... We show that for large-scale problems with favourable geometry, this ...... justable “aggressive” stepsize policy [8]; up to this policy, this is nothing but SMP with Pz .... building this representation is O(1)km2 a.o. We build this ...

  13. Computational study of large-scale p-Median problems

    E-Print Network [OSTI]

    techniques to the simplex method for the solution of large-scale instances. ... instances up to 5535 nodes and 666639 arcs, arising from an industrial ..... For each node v ? TF ? AF we build a “layered” graph rooted in v, where layer.

  14. Load Distribution in Large Scale Network Monitoring Infrastructures

    E-Print Network [OSTI]

    Politècnica de Catalunya, Universitat

    Load Distribution in Large Scale Network Monitoring Infrastructures Josep Sanju`as-Cuxart, Pere to build a scalable, distributed passive network mon- itoring system that can run several arbitrary the principal research challenges behind building a distributed network monitoring system to support

  15. Chemical engineers design, control and optimize large-scale chemical,

    E-Print Network [OSTI]

    Rohs, Remo

    Emphasis in Nanotechnology · ChemicalEngineering Emphasis in Petroleum Engineering · ChemicalEngineering38 Chemical engineers design, control and optimize large-scale chemical, physicochemical and electronics fields. Chemical Engineers are employed in areas as diverse as the chemical, materials, energy

  16. Chemical engineers design, control and optimize large-scale chemical,

    E-Print Network [OSTI]

    Rohs, Remo

    · ChemicalEngineering (Nanotechnology) Bachelor of Science 131 units · ChemicalEngineering(Petroleum38 Chemical engineers design, control and optimize large-scale chemical, physicochemical and electronics fields. Chemical Engineers are employed in areas as diverse as the chemical, pharmaceutical

  17. Chemical engineers design, control and optimize large-scale chemical,

    E-Print Network [OSTI]

    Rohs, Remo

    in Nanotechnology · ChemicalEngineering Emphasis in Petroleum Engineering · ChemicalEngineering Emphasis in Polymers38 Chemical engineers design, control and optimize large-scale chemical, physicochemical and electronics fields. Chemical Engineers are employed in areas as diverse as the chemical, pharmaceutical

  18. 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

  19. Achieving centimetre-scale supercollimation in a large-area

    E-Print Network [OSTI]

    Soljaèiæ, Marin

    demonstrations, and is an important enabling step towards the creation of high-density and low-cost optical unexpected but inherent robustness with respect to short-scale disorder such as fabrication roughness-cladding. A scanning electron micrograph of the large-area PhC possessing about 109 lattice points, fabricated through

  20. Developing A Grid Portal For Large-scale Reservoir Studies

    E-Print Network [OSTI]

    Allen, Gabrielle

    Developing A Grid Portal For Large-scale Reservoir Studies 1 Center for Computation & Technology 2 uncertainty. · Advantages of grid technology · Proposed Solution of the UCoMS Team · What is a Portal? · UCo of reservoir uncertainty... Petroleum drilling consist of many uncertainties. Main objective is to optimize

  1. Alignments of Galaxy Group Shapes with Large Scale Structure

    E-Print Network [OSTI]

    Paz, Dante J; Merchán, Manuel; Padilla, Nelson

    2011-01-01T23:59:59.000Z

    In this paper we analyse the alignment of galaxy groups with the surrounding large scale structure traced by spectroscopic galaxies from the Sloan Digital Sky Survey Data Release 7. We characterise these alignments by means of an extension of the classical two-point cross-correlation function, developed by Paz et al. 2008 (arXiv:0804.4477, MNRAS 389 1127). We find a strong alignment signal between the projected major axis of group shapes and the surrounding galaxy distribution up to scales of 30 Mpc/h. This observed anisotropy signal becomes larger as the galaxy group mass increases, in excellent agreement with the corresponding predicted alignment obtained from mock catalogues and LCDM cosmological simulations. These measurements provide new direct evidence of the adequacy of the gravitational instability picture to describe the large-scale structure formation of our Universe.

  2. Performance Health Monitoring of Large-Scale Systems

    SciTech Connect (OSTI)

    Rajamony, Ram

    2014-11-20T23:59:59.000Z

    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.

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

    E-Print Network [OSTI]

    Reed, Mark W. (Mark Wilbert)

    2010-01-01T23:59:59.000Z

    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 ...

  4. Quantum noise in large-scale coherent nonlinear photonic circuits

    E-Print Network [OSTI]

    Charles Santori; Jason S. Pelc; Raymond G. Beausoleil; Nikolas Tezak; Ryan Hamerly; Hideo Mabuchi

    2014-05-27T23:59:59.000Z

    A semiclassical simulation approach is presented for studying quantum noise in large-scale photonic circuits incorporating an ideal Kerr nonlinearity. A circuit solver is used to generate matrices defining a set of stochastic differential equations, in which the resonator field variables represent random samplings of the Wigner quasi-probability distributions. Although the semiclassical approach involves making a large-photon-number approximation, tests on one- and two-resonator circuits indicate satisfactory agreement between the semiclassical and full-quantum simulation results in the parameter regime of interest. The semiclassical model is used to simulate random errors in a large-scale circuit that contains 88 resonators and hundreds of components in total, and functions as a 4-bit ripple counter. The error rate as a function of on-state photon number is examined, and it is observed that the quantum fluctuation amplitudes do not increase as signals propagate through the circuit, an important property for scalability.

  5. Memory Power Management via Dynamic Voltage/Frequency Scaling

    E-Print Network [OSTI]

    McGaughey, Alan

    years. In the data center environment, thermal management and power budgeting have become significant transitions [10, 23], or scal- ing active server power proportionally to load [2]. In this paper, we focusMemory Power Management via Dynamic Voltage/Frequency Scaling Howard David, Chris Fallin§, Eugene

  6. Memory Power Management via Dynamic Voltage/Frequency Scaling

    E-Print Network [OSTI]

    Mutlu, Onur

    years. In the data center environment, thermal management and power budgeting have become significant sleep transitions [10, 23], or scal- ing active server power proportionally to load [2]. In this paperMemory Power Management via Dynamic Voltage/Frequency Scaling Howard David, Chris Fallin§, Eugene

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

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

    Parallel IO Software Infrastructure for Large-Scale Systems Parallel IO Software Infrastructure for Large-Scale Systems | Tags: Math & Computer Science Choudhary.png An...

  8. Geospatial Optimization of Siting Large-Scale Solar Projects

    SciTech Connect (OSTI)

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

    2014-03-01T23:59:59.000Z

    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.

  9. Large-Scale Optimization for Bayesian Inference in Complex Systems

    SciTech Connect (OSTI)

    Willcox, Karen [MIT] [MIT; Marzouk, Youssef [MIT] [MIT

    2013-11-12T23:59:59.000Z

    The SAGUARO (Scalable Algorithms for Groundwater Uncertainty Analysis and Robust Optimization) Project focused on the development of scalable numerical algorithms for large-scale Bayesian inversion in complex systems that capitalize on advances in large-scale simulation-based optimization and inversion methods. The project was a collaborative effort among MIT, the University of Texas at Austin, Georgia Institute of Technology, and Sandia National Laboratories. The research was directed in three complementary areas: efficient approximations of the Hessian operator, reductions in complexity of forward simulations via stochastic spectral approximations and model reduction, and employing large-scale optimization concepts to accelerate sampling. The MIT--Sandia component of the SAGUARO Project addressed the intractability of conventional sampling methods for large-scale statistical inverse problems by devising reduced-order models that are faithful to the full-order model over a wide range of parameter values; sampling then employs the reduced model rather than the full model, resulting in very large computational savings. Results indicate little effect on the computed posterior distribution. On the other hand, in the Texas--Georgia Tech component of the project, we retain the full-order model, but exploit inverse problem structure (adjoint-based gradients and partial Hessian information of the parameter-to-observation map) to implicitly extract lower dimensional information on the posterior distribution; this greatly speeds up sampling methods, so that fewer sampling points are needed. We can think of these two approaches as ``reduce then sample'' and ``sample then reduce.'' In fact, these two approaches are complementary, and can be used in conjunction with each other. Moreover, they both exploit deterministic inverse problem structure, in the form of adjoint-based gradient and Hessian information of the underlying parameter-to-observation map, to achieve their speedups.

  10. Glendale Water and Power- Large Business Energy Efficiency Program

    Broader source: Energy.gov [DOE]

    Glendale Water and Power (GWP) offers a rebate to its medium and large business customers with electric bills of more than $3000 per month (electric usage of 250,000 kWh annually ~ $36,000 per year...

  11. Stability Analysis of Large-Scale Incompressible Flow Calculations on Massively Parallel Computers 1 Stability Analysis of Large-

    E-Print Network [OSTI]

    Stability Analysis of Large-Scale Incompressible Flow Calculations on Massively Parallel Computers 1 Stability Analysis of Large- Scale Incompressible Flow Calculations on Massively Parallel disturbances aligned with the associated eigenvectors will grow. The Cayley transformation, cou- pled

  12. Generation of large-scale winds in horizontally anisotropic convection

    E-Print Network [OSTI]

    von Hardenberg, J; Provenzale, A; Spiegel, E A

    2015-01-01T23:59:59.000Z

    We simulate three-dimensional, horizontally periodic Rayleigh-B\\'enard convection between free-slip horizontal plates, rotating about a horizontal axis. When both the temperature difference between the plates and the rotation rate are sufficiently large, a strong horizontal wind is generated that is perpendicular to both the rotation vector and the gravity vector. The wind is turbulent, large-scale, and vertically sheared. Horizontal anisotropy, engendered here by rotation, appears necessary for such wind generation. Most of the kinetic energy of the flow resides in the wind, and the vertical turbulent heat flux is much lower on average than when there is no wind.

  13. Diffuse Gamma-Ray Emission from Large Scale Structures

    E-Print Network [OSTI]

    Dobardzic, Aleksandra

    2012-01-01T23:59:59.000Z

    For more than a decade now the complete origin of the diffuse gamma-ray emission background (EGRB) has been unknown. Major components like unresolved star-forming galaxies (making 10GeV. Moreover, we show that, even though the gamma-ray emission arising from structure formation shocks at galaxy clusters is below previous estimates, these large scale shocks can still give an important, and even dominant at high energies, contribution to the EGRB. Future detections of cluster gamma-ray emission would make our upper limit of the extragalactic gamma-ray emission from structure-formation process, a firm prediction, and give us deeper insight in evolution of these large scale shock.

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

    E-Print Network [OSTI]

    Lee, Junghoon

    2012-01-01T23:59:59.000Z

    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...

  15. A first large-scale flood inundation forecasting model

    SciTech Connect (OSTI)

    Schumann, Guy J-P; Neal, Jeffrey C.; Voisin, Nathalie; Andreadis, Konstantinos M.; Pappenberger, Florian; Phanthuwongpakdee, Kay; Hall, Amanda C.; Bates, Paul D.

    2013-11-04T23:59:59.000Z

    At present continental to global scale flood forecasting focusses on predicting at a point discharge, with little attention to the detail and accuracy of local scale inundation predictions. Yet, inundation is actually the variable of interest and all flood impacts are inherently local in nature. This paper proposes a first large scale flood inundation ensemble forecasting model that uses best available data and modeling approaches in data scarce areas and at continental scales. The model was built for the Lower Zambezi River in southeast Africa to demonstrate current flood inundation forecasting capabilities in large data-scarce regions. The inundation model domain has a surface area of approximately 170k km2. ECMWF meteorological data were used to force the VIC (Variable Infiltration Capacity) macro-scale hydrological model which simulated and routed daily flows to the input boundary locations of the 2-D hydrodynamic model. Efficient hydrodynamic modeling over large areas still requires model grid resolutions that are typically larger than the width of many river channels that play a key a role in flood wave propagation. We therefore employed a novel sub-grid channel scheme to describe the river network in detail whilst at the same time representing the floodplain at an appropriate and efficient scale. The modeling system was first calibrated using water levels on the main channel from the ICESat (Ice, Cloud, and land Elevation Satellite) laser altimeter and then applied to predict the February 2007 Mozambique floods. Model evaluation showed that simulated flood edge cells were within a distance of about 1 km (one model resolution) compared to an observed flood edge of the event. Our study highlights that physically plausible parameter values and satisfactory performance can be achieved at spatial scales ranging from tens to several hundreds of thousands of km2 and at model grid resolutions up to several km2. However, initial model test runs in forecast mode revealed that it is crucial to account for basin-wide hydrological response time when assessing lead time performances notwithstanding structural limitations in the hydrological model and possibly large inaccuracies in precipitation data.

  16. Solar thermoelectrics for small scale power generation

    E-Print Network [OSTI]

    Amatya, Reja

    2012-01-01T23:59:59.000Z

    In the past two decades, there has been a surge in the research of new thermoelectric (TE) materials, driven party by the need for clean and sustainable power generation technology. Utilizing the Seebeck effect, the ...

  17. Scaling ansatz, four zero Yukawa textures and large $?_{13}$

    E-Print Network [OSTI]

    Biswajit Adhikary; Mainak Chakraborty; Ambar Ghosal

    2012-07-09T23:59:59.000Z

    We investigate 'Scaling ansatz' in the neutrino sector within the framework of type I seesaw mechanism with diagonal charged lepton and right handed Majorana neutrino mass matrices ($M_R$). We also assume four zero texture of Dirac neutrino mass matrices ($m_D$) which severely constrain the phenomenological outcomes of such scheme. Scaling ansatz and the present neutrino data allow only Six such matrices out of 126 four zero Yukawa matrices. In this scheme, in order to generate large $\\theta_{13}$ we break scaling ansatz in $m_D$ through a perturbation parameter and we also show our breaking scheme is radiatively stable. We further investigate CP violation and baryogenesis via leptogenesis in those surviving textures.

  18. Abstract---This paper presents an efficient parallel GA (EPGA) for the solution of large scale OPF. The decomposition

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    strategy is to determine the optimal operating state of a power system by optimizing a particular objective with both continuous and discrete control variables. The continuous control variables modeled are unit algorithm and evolutionary programming applied to the OPF problem in large-scale power systems

  19. Power Compensation Effect of an Adjustable-Speed Rotary Condenser with a Flywheel for a Large Capacity Magnet Power Supply

    E-Print Network [OSTI]

    Akagi, H

    1999-01-01T23:59:59.000Z

    Power Compensation Effect of an Adjustable-Speed Rotary Condenser with a Flywheel for a Large Capacity Magnet Power Supply

  20. Generation of large-scale magnetic fields from inflation in teleparallelism

    SciTech Connect (OSTI)

    Bamba, Kazuharu [Kobayashi-Maskawa Institute for the Origin of Particles and the Universe, Nagoya University, Nagoya 464-8602 (Japan); Geng, Chao-Qiang; Luo, Ling-Wei, E-mail: bamba@kmi.nagoya-u.ac.jp, E-mail: geng@phys.nthu.edu.tw, E-mail: d9622508@oz.nthu.edu.tw [Department of Physics, National Tsing Hua University, Hsinchu, 300, Taiwan (China)

    2012-10-01T23:59:59.000Z

    We explore the generation of large-scale magnetic fields from inflation in teleparallelism, in which the gravitational theory is described by the torsion scalar instead of the scalar curvature in general relativity. In particular, we examine the case that the conformal invariance of the electromagnetic field during inflation is broken by a non-minimal gravitational coupling between the torsion scalar and the electromagnetic field. It is shown that for a power-law type coupling, the magnetic field on 1 Mpc scale with its strength of ? 10{sup ?9} G at the present time can be generated.

  1. 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

  2. Atypical Behavior Identification in Large Scale Network Traffic

    SciTech Connect (OSTI)

    Best, Daniel M.; Hafen, Ryan P.; Olsen, Bryan K.; Pike, William A.

    2011-10-23T23:59:59.000Z

    Cyber analysts are faced with the daunting challenge of identifying exploits and threats within potentially billions of daily records of network traffic. Enterprise-wide cyber traffic involves hundreds of millions of distinct IP addresses and results in data sets ranging from terabytes to petabytes of raw data. Creating behavioral models and identifying trends based on those models requires data intensive architectures and techniques that can scale as data volume increases. Analysts need scalable visualization methods that foster interactive exploration of data and enable identification of behavioral anomalies. Developers must carefully consider application design, storage, processing, and display to provide usability and interactivity with large-scale data. We present an application that highlights atypical behavior in enterprise network flow records. This is accomplished by utilizing data intensive architectures to store the data, aggregation techniques to optimize data access, statistical techniques to characterize behavior, and a visual analytic environment to render the behavioral trends, highlight atypical activity, and allow for exploration.

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

    E-Print Network [OSTI]

    Nishino, Takafumi

    2013-01-01T23:59:59.000Z

    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 $U_{F0}$.

  4. Solar cycle variations of large scale flows in the Sun

    E-Print Network [OSTI]

    Sarbani Basu; H. M. Antia

    2000-01-17T23:59:59.000Z

    Using data from the Michelson Doppler Imager (MDI) instrument on board the Solar and Heliospheric Observatory (SOHO), we study the large-scale velocity fields in the outer part of the solar convection zone using the ring diagram technique. We use observations from four different times to study possible temporal variations in flow velocity. We find definite changes in both the zonal and meridional components of the flows. The amplitude of the zonal flow appears to increase with solar activity and the flow pattern also shifts towards lower latitude with time.

  5. Statistical analysis of large-scale structure in the Universe

    E-Print Network [OSTI]

    Martin Kerscher

    1999-12-15T23:59:59.000Z

    Methods for the statistical characterization of the large-scale structure in the Universe will be the main topic of the present text. The focus is on geometrical methods, mainly Minkowski functionals and the J-function. Their relations to standard methods used in cosmology and spatial statistics and their application to cosmological datasets will be discussed. This work is not only meant as a short review for comologist, but also attempts to illustrate these morphological methods and to make them accessible to scientists from other fields. Consequently, a short introduction to the standard picture of cosmology is given.

  6. Large-Scale Anisotropy of EGRET Gamma Ray Sources

    E-Print Network [OSTI]

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

    2005-06-24T23:59:59.000Z

    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.

  7. Robust Morphological Measures for Large-Scale Structure

    E-Print Network [OSTI]

    T. Buchert

    1994-12-17T23:59:59.000Z

    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.

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

    SciTech Connect (OSTI)

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

    1994-05-01T23:59:59.000Z

    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.

  9. Large-Scale Liquid Hydrogen Handling Equipment | 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 DataDepartment of Energy Your Density Isn't YourTransport(FactDepartment ofLetter Report:40PM toLEDControl ConceptCombustionLarge-Scale

  10. IEEE TRANSACTIONS ON NETWORK AND SERVICE MANAGEMENT, VOL. 8, NO. 4, DECEMBER 2011 1 Large-Scale Network-Service Disruption

    E-Print Network [OSTI]

    Ji, Chuanyi

    to be weakly correlated with the storm. Power outages and lack of spare power are reported to be certain causes Gateway Protocol (BGP) routing infrastructure shivered in accordance with power outages. Severe weather in Brazil in 2009 caused large-scale power outages which resulted in subsequent spikes in BGP routing

  11. 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.

    2013-08-01T23:59:59.000Z

    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.

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

    SciTech Connect (OSTI)

    Infanger, G. (Stanford Univ., CA (United States). Dept. of Operations Research Technische Univ., Vienna (Austria). Inst. fuer Energiewirtschaft)

    1992-12-01T23:59:59.000Z

    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.

  13. Multilevel method for modeling large-scale networks.

    SciTech Connect (OSTI)

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

    2012-02-24T23:59:59.000Z

    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.

  14. Parallel Index and Query for Large Scale Data Analysis

    SciTech Connect (OSTI)

    Chou, Jerry; Wu, Kesheng; Ruebel, Oliver; Howison, Mark; Qiang, Ji; Prabhat,; Austin, Brian; Bethel, E. Wes; Ryne, Rob D.; Shoshani, Arie

    2011-07-18T23:59:59.000Z

    Modern scientific datasets present numerous data management and analysis challenges. State-of-the-art index and query technologies are critical for facilitating interactive exploration of large datasets, but numerous challenges remain in terms of designing a system for process- ing general scientific datasets. The system needs to be able to run on distributed multi-core platforms, efficiently utilize underlying I/O infrastructure, and scale to massive datasets. We present FastQuery, a novel software framework that address these challenges. FastQuery utilizes a state-of-the-art index and query technology (FastBit) and is designed to process mas- sive datasets on modern supercomputing platforms. We apply FastQuery to processing of a massive 50TB dataset generated by a large scale accelerator modeling code. We demonstrate the scalability of the tool to 11,520 cores. Motivated by the scientific need to search for inter- esting particles in this dataset, we use our framework to reduce search time from hours to tens of seconds.

  15. POWER, THERMAL, AND RELIABILITY MODELING IN NANOMETER-SCALE

    E-Print Network [OSTI]

    Dick, Robert

    LEAKAGE POWER. THE WAGES OF POWER ARE BULKY, SHORT-LIVED BATTERIES, HUGE HEAT SINKS, LARGE ON pow- er supply circuitry design, and reduces battery life. Researchers have recently ded- icated result in transient voltage fluctuations as a result of the distributed inductance and resistance in off

  16. Cryogenic Control Architecture for Large-Scale Quantum Computing

    E-Print Network [OSTI]

    J. M. Hornibrook; J. I. Colless; I. D. Conway Lamb; S. J. Pauka; H. Lu; A. C. Gossard; J. D. Watson; G. C. Gardner; S. Fallahi; M. J. Manfra; D. J. Reilly

    2014-09-08T23:59:59.000Z

    Solid-state qubits have recently advanced to the level that enables them, in-principle, to be scaled-up into fault-tolerant quantum computers. As these physical qubits continue to advance, meeting the challenge of realising a quantum machine will also require the engineering of new classical hardware and control architectures with complexity far beyond the systems used in today's few-qubit experiments. Here, we report a micro-architecture for controlling and reading out qubits during the execution of a quantum algorithm such as an error correcting code. We demonstrate the basic principles of this architecture in a configuration that distributes components of the control system across different temperature stages of a dilution refrigerator, as determined by the available cooling power. The combined setup includes a cryogenic field-programmable gate array (FPGA) controlling a switching matrix at 20 millikelvin which, in turn, manipulates a semiconductor qubit.

  17. Advanced, High Power, Next Scale, Wave Energy Conversion Device

    SciTech Connect (OSTI)

    Mekhiche, Mike [Principal Investigator] [Principal Investigator; Dufera, Hiz [Project Manager] [Project Manager; Montagna, Deb [Business Point of Contact] [Business Point of Contact

    2012-10-29T23:59:59.000Z

    The project conducted under DOE contract DE?EE0002649 is defined as the Advanced, High Power, Next Scale, Wave Energy Converter. The overall project is split into a seven?stage, gated development program. The work conducted under the DOE contract is OPT Stage Gate III work and a portion of Stage Gate IV work of the seven stage product development process. The project effort includes Full Concept Design & Prototype Assembly Testing building on our existing PowerBuoy? technology to deliver a device with much increased power delivery. Scaling?up from 150kW to 500kW power generating capacity required changes in the PowerBuoy design that addressed cost reduction and mass manufacturing by implementing a Design for Manufacturing (DFM) approach. The design changes also focused on reducing PowerBuoy Installation, Operation and Maintenance (IO&M) costs which are essential to reducing the overall cost of energy. In this design, changes to the core PowerBuoy technology were implemented to increase capability and reduce both CAPEX and OPEX costs. OPT conceptually envisaged moving from a floating structure to a seabed structure. The design change from a floating structure to seabed structure would provide the implementation of stroke? unlimited Power Take?Off (PTO) which has a potential to provide significant power delivery improvement and transform the wave energy industry if proven feasible.

  18. Large-scale star formation in the Magellanic Clouds

    E-Print Network [OSTI]

    Jochen M. Braun

    2001-08-03T23:59:59.000Z

    In this contribution I will present the current status of our project of stellar population analyses and spatial information of both Magellanic Clouds (MCs). The Magellanic Clouds - especially the LMC with its large size and small depth (<300pc) - are suitable laboratories and testing ground for theoretical models of star formation. With distance moduli of 18.5 and 18.9mag for the LMC and SMC, respectively, and small galactic extinction, their stellar content can be studied in detail from the most massive stars of the youngest populations (<25Myr) connected to H-alpha emission down to the low mass end of about 1/10 of a solar mass. Based on broad-band photometry (U,B,V) I present results for the supergiant shell (SGS) SMC1, some regions at the LMC east side incl. LMC2 showing different overlapping young populations and the region around N171 with its large and varying colour excess, and LMC4. This best studied SGS shows a coeval population aged about 12Myr with little age spread and no correlation to distance from LMC4's centre. I will show that the available data are not compatible with many of the proposed scenarios like SSPSF or a central trigger (like a cluster or GRB), while a large-scale trigger like the bow-shock of the rotating LMC can do the job.

  19. Optimization Online - Large-Scale Decentralized Unit Commitment

    E-Print Network [OSTI]

    Mohammad Javad Feizollahi

    2014-05-05T23:59:59.000Z

    May 5, 2014 ... ... of decentralized power system operations, including growing interest ... to International Journal of Electrical Power & Energy Systems, 2014.

  20. Large-scale weakly nonlinear perturbations of convective magnetic dynamos in a rotating layer

    E-Print Network [OSTI]

    Chertovskih, Roman

    2015-01-01T23:59:59.000Z

    We present a new mechanism for generation of large-scale magnetic field by thermal convection which does not involve the alpha-effect. We consider weakly nonlinear perturbations of space-periodic steady convective magnetic dynamos in a rotating layer that were identified in our previous work. The perturbations have a spatial scale in the horizontal direction that is much larger than the period of the perturbed convective magnetohydrodynamic state. Following the formalism of the multiscale stability theory, we have derived the system of amplitude equations governing the evolution of the leading terms in expansion of the perturbations in power series in the scale ratio. This asymptotic analysis is more involved than in the cases considered earlier, because the kernel of the operator of linearisation has zero-mean neutral modes whose origin lies in the spatial invariance of the perturbed regime, the operator reduced on the generalised kernel has two Jordan normal form blocks of size two, and simplifying symmetri...

  1. Magnet Technology for Power Converters: Nanocomposite Magnet Technology for High Frequency MW-Scale Power Converters

    SciTech Connect (OSTI)

    None

    2012-02-27T23:59:59.000Z

    Solar ADEPT Project: CMU is developing a new nanoscale magnetic material that will reduce the size, weight, and cost of utility-scale PV solar power conversion systems that connect directly to the grid. Power converters are required to turn the energy that solar power systems create into useable energy for the grid. The power conversion systems made with CMU’s nanoscale magnetic material have the potential to be 150 times lighter and significantly smaller than conventional power conversion systems that produce similar amounts of power.

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

    E-Print Network [OSTI]

    M. Pierre

    2000-11-08T23:59:59.000Z

    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.

  3. Recovery Act - Large Scale SWNT Purification and Solubilization

    SciTech Connect (OSTI)

    Michael Gemano; Dr. Linda B. McGown

    2010-10-07T23:59:59.000Z

    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.

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

    E-Print Network [OSTI]

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

    2009-12-04T23:59:59.000Z

    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.

  5. High Metallicity, Photoionised Gas in Intergalactic Large-Scale Filaments

    E-Print Network [OSTI]

    Bastien Aracil; Todd M. Tripp; David V. Bowen; Jason X. Proschaska; Hsiao-Wen Chen; Brenda L. Frye

    2006-08-21T23:59:59.000Z

    We present high-resolution UV spectra of absorption-line systems toward the low-z QSO HS0624+6907 (z=0.3700). Coupled with spectroscopic galaxy redshifts, we find that many of these absorbers are integalactic gas clouds distributed within large-scale structures. The gas is cool (T0.9). STIS data reveal a cluster of 13 HI Lyman alpha lines within a 1000 km/s interval at z=0.0635. We find 10 galaxies at this redshift with impact parameters ranging from 135 h^-1 kpc to 1.37 h^-1 Mpc. We attribute the HI Lya absorptions to intragroup medium gas, possibly from a large-scale filament viewed along its long axis. Remarkably, the metallicity is near-solar, [M/H] = -0.05 +/- 0.4 (2 sigma uncertainty), yet the nearest galaxy which might pollute the IGM is at least 135 h_70^-1 kpc away. Tidal stripping from nearby galaxies appears to be the most likely origin of this highly enriched, cool gas. More than six Abell galaxy clusters are found within 4 degree of the sight line suggesting that the QSO line of sight passes near a node in the cosmic web. At z~0.077, we find absorption systems as well as galaxies at the redshift of the nearby clusters Abell 564 and Abell 559. We conclude that the sight line pierces a filament of gas and galaxies feeding into these clusters. The absorber at z_abs = 0.07573 associated with Abell 564/559 also has a high metallicity with [C/H] > -0.6, but again the closest galaxy is relatively far from the sight line (293 h^-1 kpc).

  6. Large-scale fabrication and assembly of carbon nanotubes via nanopelleting

    E-Print Network [OSTI]

    El Aguizy, Tarek A., 1977-

    2004-01-01T23:59:59.000Z

    Widespread use of carbon nanotubes is predicated on the development of robust large-scale manufacturing techniques. There remain, however, few feasible methods for the large-scale handling of aligned and geometrically ...

  7. Optimization of auxiliary power systems design for large generating units

    SciTech Connect (OSTI)

    Fabri, E.I.; Kang, E.K.; Dusterdick, R.W.

    1980-01-01T23:59:59.000Z

    Modern fossil and nuclear generating units require the support of a fairly large and complex electric auxiliary power system. The selection of an optimized and cost-effective auxiliary power transformer rating may be a difficult process, since the loading profile and coincident operation of the loads often cannot be firmly defined at an early stage of design. The authors believe that this important design process could be greatly aided by systematic field tests and recording of the actual auxiliary loading profiles during various modes of plant operations.

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

    SciTech Connect (OSTI)

    Naklie, M.M. [Mobil Technology Co., Dallas, TX (United States)

    1997-06-30T23:59:59.000Z

    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.

  9. 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. [eds.

    1994-05-01T23:59:59.000Z

    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).

  10. Covariance of cross-correlations: towards efficient measures for large-scale structure

    E-Print Network [OSTI]

    Robert E. Smith

    2009-06-13T23:59:59.000Z

    We study the covariance of the cross-power spectrum of different tracers for the large-scale structure. We develop the counts-in-cells framework for the multi-tracer approach, and use this to derive expressions for the full non-Gaussian covariance matrix. We show, that for the usual auto-power statistic, besides the off-diagonal covariance generated through gravitational mode-coupling, the discreteness of the tracers and their associated sampling distribution can generate strong off-diagonal covariance, and that this becomes the dominant source of covariance as k>>k_f=2 pi/L. On comparison with the derived expressions for the cross-power covariance, we show that the off-diagonal terms can be suppressed, if one cross-correlates a high tracer-density sample with a low one. Taking the effective estimator efficiency to be proportional to the signal-to-noise ratio (SN), we show that, to probe clustering as a function of physical properties of the sample, i.e. cluster mass or galaxy luminosity, then the cross-power approach can out perform the auto-power one by factors of a few. We confront the theory with measurements of the mass-mass, halo-mass, and halo-halo power spectra from a large ensemble of N-body simulations. We show that there is a significant SN advantage to be gained from using the cross-power approach when studying the bias of rare haloes. The analysis is repeated in configuration space and again SN improvement is found. We estimate the covariance matrix for these samples, and find strong off-diagonal contributions. The covariance depends on halo mass, with higher mass samples having stronger covariance. In agreement with theory, we show that the covariance is suppressed for the cross-power. This work points the way towards improved estimators for clustering studies.

  11. An Evaluation of the Network Simulators in Large-Scale Distributed Simulations

    SciTech Connect (OSTI)

    Ciraci, Selim; Akyol, Bora A.

    2011-11-13T23:59:59.000Z

    This is a survey paper about the state-of-the-art in large-scale network simulation. Networks for the smart grids are characterized by millions of sensor nodes exchanging information about the status of the grid. This information exchange must be realized reliably and efficiently due to the mission critical nature of the power grid. Hence, the applications and the network protocols developed for the smart grid need go through rigorous testing and analysis before deployment. Developers usually do not have access to such a large-scale network that can be used as a controlled test-bed; therefore, network simulation becomes an essential tool for testing. Network simulation is a well studied problem in the literature and there are various widely used network simulators. These simulators can be adopted for testing applications and protocols of the smart grid. Due to the scale of these networks, parallel/distributed simulations need to be conducted. Even though most network simulators support distributed simulations, generating a large-scale network model to simulate can still be a cumbersome task. In this survey, we describe a selection of commonly used network simulators and evaluate them with respect to the following features that can aid users in distributed simulations of large-scale networks: transparency of setting up distributed simulation, automated topology generation, information hiding, lightweight routing protocols, network error simulation, evaluation of the network model during simulation and trace analysis tools. As a complementary result, we identify two issues with network simulators that can be addressed with runtime steering methods.

  12. The Anatomy of a Large-Scale Hypertextual Web Search Sergey Brin and Lawrence Page

    E-Print Network [OSTI]

    Matwin, Stan

    . This paper addresses this question of how to build a practical large-scale system which can exploit of googol, or 10100 and fits well with our goal of building very large- scale search engines. 1.1 Web Search Engines -- Scaling Up: 1994 - 2000 Search engine technology has had to scale dramatically to keep up

  13. Influence of Western North Pacific Tropical Cyclones on Their Large-Scale Environment

    E-Print Network [OSTI]

    Sobel, Adam

    water vapor, and sea surface tem- perature (SST)] on an index of TC activity [accumulated cyclone energyInfluence of Western North Pacific Tropical Cyclones on Their Large-Scale Environment ADAM H. SOBEL) tropical cyclones (TCs) on their large-scale environment by lag regressing various large-scale climate

  14. Large Scale Approximate Inference and Experimental Design for Sparse Linear Models

    E-Print Network [OSTI]

    Seeger, Matthias

    Large Scale Approximate Inference and Experimental Design for Sparse Linear Models Matthias W.kyb.tuebingen.mpg.de/bs/people/seeger/ 27 June 2008 Matthias W. Seeger (MPI BioCyb) Large Scale Bayesian Experimental Design 27/6/08 1 / 27 Algorithms 4 Magnetic Resonance Imaging Sequences Matthias W. Seeger (MPI BioCyb) Large Scale Bayesian

  15. LiveBench-2: Large-Scale Automated Evaluation of Protein Structure Prediction Servers

    E-Print Network [OSTI]

    Fischer, Daniel

    LiveBench-2: Large-Scale Automated Evaluation of Protein Structure Prediction Servers Janusz M from other evaluation experiments because it is a large-scale and a fully automated procedure. Since, to keep in pace with the development, we present the results of the second large-scale evaluation of pro

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

    SciTech Connect (OSTI)

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

    2012-04-26T23:59:59.000Z

    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.

  17. IEEE TRANSACTIONS ON VERY LARGE SCALE INTEGRATION (VLSI) SYSTEMS, VOL. 21, NO. 10, OCTOBER 2013 1769 Enhancing the Efficiency of Energy-Constrained

    E-Print Network [OSTI]

    Kahng, Andrew B.

    often spend a large fraction of their lifetimes in a low-power mode. However, DVFS designs producedIEEE TRANSACTIONS ON VERY LARGE SCALE INTEGRATION (VLSI) SYSTEMS, VOL. 21, NO. 10, OCTOBER 2013 that allows a hardware design to reduce average power consumption while still enabling the design to meet

  18. Improved Structure and Fabrication of Large, High-Power KHPS Rotors - Final Scientific/Technical Report

    SciTech Connect (OSTI)

    Corren, Dean [Verdant Power, Inc.; Colby, Jonathan [Verdant Power, Inc.; Adonizio, Mary Ann [Verdant Power, Inc.

    2013-01-29T23:59:59.000Z

    Verdant Power, Inc, working in partnership with the National Renewable Energy Laboratory (NREL), Sandia National Laboratories (SNL), and the University of Minnesota St. Anthony Falls Laboratory (SAFL), among other partners, used evolving Computational Fluid Dynamics (CFD) and Finite Element Analysis (FEA) models and techniques to improve the structure and fabrication of large, high-power composite Kinetic Hydropower System (KHPS) rotor blades. The objectives of the project were to: design; analyze; develop for manufacture and fabricate; and thoroughly test, in the lab and at full scale in the water, the improved KHPS rotor blade.

  19. Fractal power spectra plotted upside-down Comment on ``Scaling of power spectrum of extinction events

    E-Print Network [OSTI]

    Kirchner, James W.

    Discussion Fractal power spectra plotted upside-down Comment on ``Scaling of power spectrum. Dimri and Pra- kash interpret their results as demonstrating a fractal pattern in the fossil record or not the underlying data are fractal. Similarly, their use of interpolated time series (in their ¢gures 1b,d, 2a,b, 3a

  20. 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.

    2012-12-01T23:59:59.000Z

    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).

  1. IEEE TRANSACTIONS ON VERY LARGE SCALE INTEGRATION (VLSI) SYSTEMS, VOL. 17, NO. 1, JANUARY 2009 103 Hierarchical Segmentation for Hardware

    E-Print Network [OSTI]

    Luk, Wayne

    IEEE TRANSACTIONS ON VERY LARGE SCALE INTEGRATION (VLSI) SYSTEMS, VOL. 17, NO. 1, JANUARY 2009 103 involving uniform splines and splines with size varying by powers of two is particularly well suited at the output. A coefficient transformation technique is also described, which significantly reduces the dynamic

  2. IEEE TRANSACTIONS ON VERY LARGE SCALE INTEGRATION (VLSI) SYSTEMS, VOL. 11, NO. 1, FEBRUARY 2003 129 Relative Timing

    E-Print Network [OSTI]

    Stevens, Ken

    IEEE TRANSACTIONS ON VERY LARGE SCALE INTEGRATION (VLSI) SYSTEMS, VOL. 11, NO. 1, FEBRUARY 2003 129 synthesis and veri- fication are demonstrated on three example circuits, facilitating transformations from perfor- mance, area, power, and functional testability of up to a factor of 3 in all three cases

  3. The Eval that Men Do A Large-scale Study of the Use of Eval in JavaScript Applications

    E-Print Network [OSTI]

    Vitek, Jan

    The Eval that Men Do A Large-scale Study of the Use of Eval in JavaScript Applications Gregor. Transforming text into executable code with a function such as Java- Script's eval endows programmers with the ability to extend applications, at any time, and in almost any way they choose. But, this expressive power

  4. 42 IEEE TRANSACTIONS ON VERY LARGE SCALE INTEGRATION (VLSI) SYSTEMS, VOL. 12, NO. 1, JANUARY 2004 Timing Driven Gate Duplication

    E-Print Network [OSTI]

    Kastner, Ryan

    42 IEEE TRANSACTIONS ON VERY LARGE SCALE INTEGRATION (VLSI) SYSTEMS, VOL. 12, NO. 1, JANUARY 2004 of transforming a set of boolean equations into a circuit comprising of gates that implement the logic while, and power) but the present work deals with delay optimization. Many timing optimization strategies have been

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

    E-Print Network [OSTI]

    Carrete, Martina

    through increments in mortality rates. For this purpose, we evaluate potential conse- quences of wind-term impacts of wind-farms rather than focusing on short-term mortality, as is often promoted by powerLarge scale risk-assessment of wind-farms on population viability of a globally endangered long

  6. This book is designed to be a comprehensive treatment of parallel al gorithms for optimal control of large scale linear and bilinear systems.

    E-Print Network [OSTI]

    Gajic, Zoran

    ­ tion column, steam power system, hydro power plant, chemical plants, gas absorber, supported beam the power and usefulness of the synchronous parallel algorithms for optimal control of large scale linearPreface This book is designed to be a comprehensive treatment of parallel al­ gorithms for optimal

  7. Global Wind Power Conference September 18-21, 2006, Adelaide, Australia Design and Operation of Power Systems with Large Amounts of Wind Power, first

    E-Print Network [OSTI]

    of Power Systems with Large Amounts of Wind Power, first results of IEA collaboration Hannele Holttinen1.holttinen@vtt.fi Abstract: An international forum for exchange of knowledge of power system impacts of wind power has been Systems with Large Amounts of Wind Power"will analyse existing case studies from different power systems

  8. ANALYSIS OF TURBULENT MIXING JETS IN LARGE SCALE TANK

    SciTech Connect (OSTI)

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

    2007-03-28T23:59:59.000Z

    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.

  9. Classical Control of Large-Scale Quantum Computers

    E-Print Network [OSTI]

    Simon J. Devitt

    2014-05-20T23:59:59.000Z

    The accelerated development of quantum technology has reached a pivotal point. Early in 2014, several results were published demonstrating that several experimental technologies are now accurate enough to satisfy the requirements of fault-tolerant, error corrected quantum computation. While there are many technological and experimental issues that still need to be solved, the ability of experimental systems to now have error rates low enough to satisfy the fault-tolerant threshold for several error correction models is a tremendous milestone. Consequently, it is now a good time for the computer science and classical engineering community to examine the {\\em classical} problems associated with compiling quantum algorithms and implementing them on future quantum hardware. In this paper, we will review the basic operational rules of a topological quantum computing architecture and outline one of the most important classical problems that need to be solved; the decoding of error correction data for a large-scale quantum computer. We will endeavour to present these problems independently from the underlying physics as much of this work can be effectively solved by non-experts in quantum information or quantum mechanics.

  10. Testing Inflation with Large Scale Structure: Connecting Hopes with Reality

    E-Print Network [OSTI]

    Marcelo Alvarez; Tobias Baldauf; J. Richard Bond; Neal Dalal; Roland de Putter; Olivier Doré; Daniel Green; Chris Hirata; Zhiqi Huang; Dragan Huterer; Donghui Jeong; Matthew C. Johnson; Elisabeth Krause; Marilena Loverde; Joel Meyers; P. Daniel Meerburg; Leonardo Senatore; Sarah Shandera; Eva Silverstein; Anže Slosar; Kendrick Smith; Matias Zaldarriaga; Valentin Assassi; Jonathan Braden; Amir Hajian; Takeshi Kobayashi; George Stein; Alexander van Engelen

    2014-12-15T23:59:59.000Z

    The statistics of primordial curvature fluctuations are our window into the period of inflation, where these fluctuations were generated. To date, the cosmic microwave background has been the dominant source of information about these perturbations. Large scale structure is however from where drastic improvements should originate. In this paper, we explain the theoretical motivations for pursuing such measurements and the challenges that lie ahead. In particular, we discuss and identify theoretical targets regarding the measurement of primordial non-Gaussianity. We argue that when quantified in terms of the local (equilateral) template amplitude $f_{\\rm NL}^{\\rm loc}$ ($f_{\\rm NL}^{\\rm eq}$), natural target levels of sensitivity are $\\Delta f_{\\rm NL}^{\\rm loc, eq.} \\simeq 1$. We highlight that such levels are within reach of future surveys by measuring 2-, 3- and 4-point statistics of the galaxy spatial distribution. This paper summarizes a workshop held at CITA (University of Toronto) on October 23-24, 2014.

  11. Giant radio galaxies - II. Tracers of large-scale structure

    E-Print Network [OSTI]

    Malarecki, J M; Saripalli, L; Staveley-Smith, L; Subrahmanyan, R

    2015-01-01T23:59:59.000Z

    We have carried out optical spectroscopy with the Anglo-Australian Telescope for 24,726 objects surrounding a sample of 19 Giant Radio Galaxies (GRGs) selected to have redshifts in the range 0.05 to 0.15 and projected linear sizes from 0.8 to 3.2 Mpc. Such radio galaxies are ideal candidates to study the Warm-Hot Intergalactic Medium (WHIM) because their radio lobes extend beyond the ISM and halos of their host galaxies, and into the tenuous IGM. We were able to measure redshifts for 9,076 galaxies. Radio imaging of each GRG, including high-sensitivity, wideband radio observations from the Australia Telescope Compact Array for 12 GRGs and host optical spectra (presented in a previous paper, Malarecki et al. 2013), is used in conjunction with the surrounding galaxy redshifts to trace large-scale structure. We find that the mean galaxy number overdensity in volumes of ~700 Mpc$^3$ near the GRG host galaxies is ~70 indicating an overdense but non-virialized environment. A Fourier component analysis is used to qu...

  12. Improving Large Scale Day-ahead Security Constrained Unit ...

    E-Print Network [OSTI]

    ychen

    2015-06-28T23:59:59.000Z

    Transmission line limit. Injection ... can Electric Reliability Corporation (NERC) requirements. ... solve DC power flow to identify additional transmission viola-.

  13. 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)

    2010-01-01T23:59:59.000Z

    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.

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

    SciTech Connect (OSTI)

    Gerber, Richard A.; Wasserman, Harvey J.

    2012-03-02T23:59:59.000Z

    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.

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

    SciTech Connect (OSTI)

    Baring-Gould, E. I.

    2013-08-01T23:59:59.000Z

    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.

  16. Oxide based thermoelectric materials for large scale power generation

    E-Print Network [OSTI]

    Song, Yang, M. Eng. Massachusetts Institute of Technology

    2008-01-01T23:59:59.000Z

    The thermoelectric (TE) devices are based on the Seebeck and Peltier effects, which describe the conversion between temperature gradient and electricity. The effectiveness of the material performance can be described by ...

  17. Robust, Multifunctional Joint for Large Scale Power Production Stacks -

    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What's PossibleRadiation Protection TechnicalResonantNovember 15 toAdvances

  18. 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.

    2014-02-01T23:59:59.000Z

    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.

  19. 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

  20. Architecture for a large-scale ion-trap quantum computer

    E-Print Network [OSTI]

    individually experimentally demonstrated. The quantum CCD To build up a large-scale quantum computer, we have demonstrated in this system, there exist theoretical and technical obstacles to scaling up the approachArchitecture for a large-scale ion-trap quantum computer D. Kielpinski*, C. Monroe & D. J. Wineland

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

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

    Finalizes Partial Guarantee for 852 Million Loan to Support California Concentrating Solar Power Plant Energy Department Finalizes Loan Guarantee for Transformational Rooftop...

  2. Clean Energy Solutions Large Scale CHP and Fuel Cells Program

    Broader source: Energy.gov [DOE]

    The New Jersey Economic Development Authority (EDA) is offering grants for the installation of combined heat and power (CHP) or fuel cell systems to commercial, industrial, and institutional...

  3. Hamming embedding and weak geometric consistency for large scale image search

    E-Print Network [OSTI]

    Verbeek, Jakob

    Hamming embedding and weak geometric consistency for large scale image search Herve Jegou, Matthijs improves recent methods for large scale image search. State-of-the-art methods build on the bag large datasets. Exper- iments performed on a dataset of one million of images show a signifi- cant

  4. Large-Scale FPGA-based Convolutional Networks Clement Farabet1

    E-Print Network [OSTI]

    LeCun, Yann

    Large-Scale FPGA-based Convolutional Networks Cl´ement Farabet1 , Yann LeCun1 , Koray Kavukcuoglu1, New Haven, USA Chapter in Machine Learning on Very Large Data Sets, edited by Ron Bekkerman, Mikhail Bilenko, and John Langford, Cambridge University Press, 2011. May 2, 2011 1 #12;Large-Scale FPGA

  5. A Protocol for the Atomic Capture of Multiple Molecules on Large Scale Platforms

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    A Protocol for the Atomic Capture of Multiple Molecules on Large Scale Platforms Marin Bertier services. Envi- sioned over largely distributed and highly dynamic platforms, expressing this coordination coordination of services. However, the execution of such programs over large scale platforms raises several

  6. Radial scale effect on the performance of low-power cylindrical Hall plasma thrusters

    SciTech Connect (OSTI)

    Seo, Mihui; Lee, Jongsub; Choe, Wonho [Department of Physics, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701 (Korea, Republic of)] [Department of Physics, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701 (Korea, Republic of); Seon, Jongho [School of Space Research, Kyung Hee University, 1732 Deokyoungdaero, Giheung-gu, Yongin-si, Gyeonggi-do 446-701 (Korea, Republic of)] [School of Space Research, Kyung Hee University, 1732 Deokyoungdaero, Giheung-gu, Yongin-si, Gyeonggi-do 446-701 (Korea, Republic of); June Lee, Hae [Department of Electrical Engineering, Pusan National University, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 609-735 (Korea, Republic of)] [Department of Electrical Engineering, Pusan National University, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 609-735 (Korea, Republic of)

    2013-09-23T23:59:59.000Z

    Investigation of the radial scale effect on low-power cylindrical Hall thrusters has been undertaken by comparing the thrusters with three different channel diameters of 28, 40, and 50 mm. The investigation found that both the anode efficiency and the thrust of the larger thruster are higher as the anode power is raised. On the other hand, higher current and propellant utilizations are achieved for the smaller thruster, which is due to higher neutral density and better electron confinement. The large plume angle of the small cylindrical Hall thruster causes thrust loss, resulting in the reduction of anode efficiency.

  7. Waste Heat-to-Power in Small Scale Industry Using Scroll Expander...

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

    in Small Scale Industry Using Scroll Expander for Organic Rankine Bottoming Cycle Waste Heat-to-Power in Small Scale Industry Using Scroll Expander for Organic Rankine...

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

    SciTech Connect (OSTI)

    Gerber, Richard A.; Wasserman, Harvey

    2010-11-24T23:59:59.000Z

    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.

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

    E-Print Network [OSTI]

    Nivoit, Jean-Baptiste (Jean-Baptiste Henri)

    2013-01-01T23:59:59.000Z

    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 ...

  10. Vulnerability of nuclear power plant structures to large external fires

    SciTech Connect (OSTI)

    Bennett, D.E.

    1983-08-01T23:59:59.000Z

    This report examines the inherent vulnerability of nuclear power plant structures to the thermal environments arising from large, external fires. The inherent vulnerability is the capacity of the concrete safety-related structures to absorb thermal loads without exceeding the appropriate thermal and structural design criteria. The potential sources of these thermal environments are large, offsite fires arising from accidents involving the transportation or storage of large quantities of flammable gases or liquids. A realistic thermal response analysis of a concrete panel was performed using three limiting criteria: temperature at the first rebar location, erosion and ablation of the front (exterior) surface due to high heat fluxes, and temperature at the back (interior) surface. The results of this analysis yield a relationship between incident heat flux and the maximum allowable exposure duration. Example calculations for the break of a 0.91 m (3') diameter high-pressure natural gas pipeline and a 1 m/sup 2/ hole in a 2-1/2 million gallon gasoline tank show that the resulting fires do not pose a significant hazard for ranges of 500 m or greater.

  11. Isocurvature and curvaton perturbations with red power spectrum and large hemispherical asymmetry

    SciTech Connect (OSTI)

    McDonald, John, E-mail: j.mcdonald@lancaster.ac.uk [Lancaster-Manchester-Sheffield Consortium for Fundamental Physics, Cosmology and Astroparticle Physics Group, Dept. of Physics, University of Lancaster, Lancaster LA1 4YB (United Kingdom)

    2013-07-01T23:59:59.000Z

    We calculate the power spectrum and hemispherical asymmetry of isocurvature and curvaton perturbations due to a complex field ? which is evolving along the tachyonic part of its potential. Using a semi-classical evolution of initially sub-horizon quantum fluctuations, we compute the power spectrum, mean field and hemispherical asymmetry as a function of the number of e-foldings of tachyonic growth ?N and the tachyonic mass term cH{sup 2}. We find that a large hemispherical asymmetry due to the modulation of |?| can easily be generated via the spatial modulation of |?| across the horizon, with ?|?|/|?| > 0.5 when the observed Universe exits the horizon within 10-40 e-foldings of the beginning of tachyonic evolution and c is in the range 0.1-1. The spectral index of the isocurvature and curvaton perturbations is generally negative, corresponding to a red power spectrum. Dark matter isocurvature perturbations due to an axion-like curvaton with a large hemispherical asymmetry may be able to explain the hemispherical asymmetry observed by WMAP and Planck. In this case, the red spectrum can additionally suppress the hemispherical asymmetry at small scales, which should make it easier to satisfy scale-dependence requirements on the asymmetry from quasar number counts.

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

    E-Print Network [OSTI]

    Bremer, Peer-Timo

    2010-01-01T23:59:59.000Z

    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 ,

  13. Performance Engineering: Understanding and Improving the Performance of Large-Scale Codes

    E-Print Network [OSTI]

    2008-01-01T23:59:59.000Z

    An API for Runtime Code Patching,” Journal of Highof the Conference on Code Generation and Optimization,Performance of Large-Scale Codes David H. Bailey 1 , Robert

  14. A Large-Scale Sentiment Analysis for Yahoo! Answers Onur Kucuktunc

    E-Print Network [OSTI]

    Ferhatosmanoglu, Hakan

    and Behavioral Sciences]: Psychology, Sociology General Terms Design, Experimentation, Human Factors, MeasurementA Large-Scale Sentiment Analysis for Yahoo! Answers Onur Kucuktunc The Ohio State University

  15. a min-max regret robust optimization approach for large scale full ...

    E-Print Network [OSTI]

    admin

    2007-07-20T23:59:59.000Z

    the full-factorial scenario design of data uncertainty. The proposed algorithm is shown to be efficient for solving large-scale min-max regret robust optimization ...

  16. AFBC-HAGT, an efficient small scale power plant

    SciTech Connect (OSTI)

    Ashworth, R.A. [Energy and Environmental Research Corp., Orrville, OH (United States); Webner, R.L. [Will-Burt Company, Orrville, OH (United States); Keener, H.M. [Ohio State Univ., Wooster, OH (United States). Ohio Agricultural Research and Development Center

    1997-12-31T23:59:59.000Z

    A team comprised of the Energy and Environmental Research Corporation (EER), the Will-Burt Company, and the Ohio Agricultural Research and Development Center (OARDC) designed installed and tested a pilot scale atmospheric fluidized (bubbling) bed combustion (AFBC) system to heat hot water. Following testing, a commercial prototype unit was installed at Cedar Lane Farms (CLF), near Wooster, Ohio. The unit was started up in January, 1995, and is currently in operation. It provides hot water for greenhouse heating, requiring about two hours per day of operator attention. The development was funded by the Ohio Coal Development Office, the U.S. Department of Energy, and the team members. Based on the success of the prototype operation a commercial size unit was recently designed for hot water heating use. This small scale AFBC system can be designed not only to produce hot water or steam but also to efficiently generate electricity (60 kWe to 3.5 MWe size range). Most small scale fluidized bed systems use in-bed heat transfer tubes to generate saturated steam which can then be superheated and fed to a steam turbine for electrical power generation. This AFBC has no internal heat transfer surfaces. It can be combined with an air heater that is integrated with a recuperated Hot Air Gas Turbine (HAGT), to yield a more efficient power plant than that possible with small steam plants of comparable size that have optimal gross efficiencies of about 12% (29,060 Btu/kWhr). Depending on ambient air temperature, this AFBC-HAGT power cycle can reach efficiencies of 28% without auxiliary diesel fuel oil firing. The system is ideally suited for rural communities that are not tied into an electric power grid. It is low tech, easy to operate, provides approximately double the efficiency of small steam cycle power plants, and can be used in areas where water is scarce. When firing local coal and/or bio-mass it can be very cost effective compared to diesel power generation.

  17. Feature scaling of large, ballasted, field emission arrays

    E-Print Network [OSTI]

    Guerrera, Stephen A. (Stephen Angelo)

    2011-01-01T23:59:59.000Z

    Field emitters are an exciting technology for high-frequency, high-power applications because of their excellent free space electron transport, and their potential for high current density and high current, especially when ...

  18. 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.

    2010-02-28T23:59:59.000Z

    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.

  19. This article has been accepted for inclusion in a future issue of this journal. Content is final as presented, with the exception of pagination. IEEE TRANSACTIONS ON VERY LARGE SCALE INTEGRATION (VLSI) SYSTEMS 1

    E-Print Network [OSTI]

    Kambhampati, Subbarao

    , and consequently, large memory power consumption. Voltage scaling is an effective way of reducing memory power as presented, with the exception of pagination. IEEE TRANSACTIONS ON VERY LARGE SCALE INTEGRATION (VLSI transform coefficients to identify and remove SRAM errors. These techniques do not require any additional

  20. Atmospheric perturbations of large-scale nuclear war

    SciTech Connect (OSTI)

    Malone, R.C.

    1985-01-01T23:59:59.000Z

    Computer simulation of the injection into the atmosphere of a large quantity of smoke following a nuclear war are described. The focus is on what might happen to the smoke after it enters the atmosphere and what changes, or perturbations, could be induced in the atmospheric structure and circulation by the pressure of a large quantity of smoke. 4 refs., 7 figs. (ACR)

  1. Update to Large Power Transformers and the U.S. Electric Grid...

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

    Update to Large Power Transformers and the U.S. Electric Grid Report Now Available Update to Large Power Transformers and the U.S. Electric Grid Report Now Available April 25, 2014...

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

    E-Print Network [OSTI]

    Zhou, Q.

    2012-01-01T23:59:59.000Z

    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

  3. Large-Scale Evacuation Network Model for Transporting Evacuees with Multiple Priorities

    E-Print Network [OSTI]

    Na, Hyeong Suk

    2014-05-01T23:59:59.000Z

    There are increasing numbers of natural disasters occurring worldwide, particularly in populated areas. Such events affect a large number of people causing injuries and fatalities. With ever increasing damage being caused by large-scale natural...

  4. IEEE TRANSACTIONS ON VERY LARGE SCALE INTEGRATION (VLSI) SYSTEMS, VOL. 13, NO. 6, JUNE 2005 765 VARIABILITY RESULTS FOR DUAL-THRESHOLD VOLTAGE ALLOCATION

    E-Print Network [OSTI]

    Dueck, Gerhard W.

    IEEE TRANSACTIONS ON VERY LARGE SCALE INTEGRATION (VLSI) SYSTEMS, VOL. 13, NO. 6, JUNE 2005 765, and M. I. Elmasry, "Dynamic and leakage power reduction in MTCMOS circuits using an automated effi. 1997. [6] Q. Wang and S. B. K. Vrudhula, "Static power optimization of deep submicron CMOS circuits

  5. IEEE TRANSACTIONS ON VERY LARGE SCALE INTEGRATION (VLSI) SYSTEMS, VOL. XX, NO. Y, MONTH 2002 1 Techniques for Energy-Efficient Communication

    E-Print Network [OSTI]

    Potkonjak, Miodrag

    IEEE TRANSACTIONS ON VERY LARGE SCALE INTEGRATION (VLSI) SYSTEMS, VOL. XX, NO. Y, MONTH 2002 1 of communication pipelines. At the same time, power/energy consumption is often another limiting factor in many portable systems. We address the problem of how to mini- mize the power consumption in system

  6. Large-scale weakly nonlinear perturbations of convective magnetic dynamos in a rotating layer

    E-Print Network [OSTI]

    Roman Chertovskih; Vladislav Zheligovsky

    2015-04-26T23:59:59.000Z

    We present a new mechanism for generation of large-scale magnetic field by thermal convection which does not involve the alpha-effect. We consider weakly nonlinear perturbations of space-periodic steady convective magnetic dynamos in a rotating layer that were identified in our previous work. The perturbations have a spatial scale in the horizontal direction that is much larger than the period of the perturbed convective magnetohydrodynamic state. Following the formalism of the multiscale stability theory, we have derived the system of amplitude equations governing the evolution of the leading terms in expansion of the perturbations in power series in the scale ratio. This asymptotic analysis is more involved than in the cases considered earlier, because the kernel of the operator of linearisation has zero-mean neutral modes whose origin lies in the spatial invariance of the perturbed regime, the operator reduced on the generalised kernel has two Jordan normal form blocks of size two, and simplifying symmetries of the perturbed state are now missing. Numerical results for the amplitude equations show that a perturbation, periodic in slow horizontal variable, either decays in time, or blows up at a finite time with amplitudes turning into a periodically-replicated delta-function moving at a constant speed.

  7. The Effects of Smoothing on the Statistical Properties of the Large-Scale Cosmic Fileds

    E-Print Network [OSTI]

    F. Bernardeau

    1994-03-10T23:59:59.000Z

    It has been shown that the large--scale correlation functions of the density field (and velocity divergence field) follow a specific hierarchy in the quasilinear regime and for Gaussian initial conditions (Bernardeau 1992). The exact relationships between the cumulants of the probability distribution functions (the so-called $S_p$ parameters) are however sensitive to the smoothing window function applied to the fields. In this paper, I present a method to derive the whole series of the $S_p$ parameters when the density field is smoothed with a top--hat window function. The results are valid for any power spectrum and any cosmological parameters. Similar calculations are presented for the velocity divergence field. The resulting shapes of the one--point probability distribution functions of the cosmic density and the velocity divergence fields are given as a function of the power spectrum and $\\Omega$. Simple analytical fits are proposed when the index of the power spectrum is -1. Comparisons with numerical simulations prove these analytical results to be extremely accurate.

  8. Constraints on primordial non-Gaussianity from large scale structure probes

    SciTech Connect (OSTI)

    Xia, Jun-Qing; Baccigalupi, Carlo [Scuola Internazionale Superiore di Studi Avanzati, Via Bonomea 265, I-34136 Trieste (Italy); Matarrese, Sabino [Dipartimento di Fisica ''G. Galilei'', Università di Padova, Via Marzolo 8, I-35131 Padova (Italy); Verde, Licia [ICREA (Institució Catalana de Recerca i Estudis Avançats) and Instituto de Ciencias del Cosmos, (ICC-UB-IEEC) Universidad de Barcelona, Marti i Franques 1, 08028, Barcelona (Spain); Viel, Matteo, E-mail: xia@sissa.it, E-mail: bacci@sissa.it, E-mail: sabino.matarrese@pd.infn.it, E-mail: liciaverde@icc.ub.edu, E-mail: viel@oats.inaf.it [INAF-Osservatorio Astronomico di Trieste, Via G.B. Tiepolo 11, I-34131 Trieste (Italy)

    2011-08-01T23:59:59.000Z

    In this paper we measure the angular power spectra C{sub l} of three high-redshift large-scale structure probes: the radio sources from the NRAO VLA Sky Survey (NVSS), the quasar catalogue of Sloan Digital Sky Survey Release Six (SDSS DR6 QSOs) and the MegaZ-LRG (DR7), the final SDSS II Luminous Red Galaxy (LRG) photometric redshift survey. We perform a global analysis of the constraints on the amplitude of primordial non-Gaussianity from these angular power spectra, as well as from their cross-correlation power spectra with the cosmic microwave background (CMB) temperature map. In particular, we include non-Gaussianity of the type arising from single-field slow roll, multifields, curvaton (local type), and those which effects on the halo clustering can be described by the equilateral template (related to higher-order derivative type non-Gaussianity) and by the enfolded template (related to modified initial state or higher-derivative interactions). When combining all data sets, we obtain limits of f{sub NL} = 48±20, f{sub NL} = 50±265 and f{sub NL} = 183±95 at 68% confidence level for local, equilateral and enfolded templates, respectively. Furthermore, we explore the constraint on the cubic correction g{sub NL}?{sup 3} on the bias of dark matter haloes and obtain a limit of ?1.2 × 10{sup 5} < g{sub NL} < 11.3 × 10{sup 5} at 95% confidence level.

  9. Large scale flows in the solar interior: Effect of asymmetry in peak profiles

    E-Print Network [OSTI]

    Sarbani Basu; H. M. Antia

    1999-06-15T23:59:59.000Z

    Ring diagram analysis can be used to study large scale velocity fields in the outer part of the solar convection zone. All previous works assume that the peak profiles in the solar oscillation power spectrum are symmetric. However, it has now been demonstrated that the peaks are not symmetric. In this work we study how the explicit use of asymmetric peak profiles in ring-diagram analysis influences the estimated velocity fields. We find that the use of asymmetric profiles leads to significant improvement in the fits, but the estimated velocity fields are not substantially different from those obtained using a symmetric profile to fit the peaks. The resulting velocity fields are compared with those obtained by other investigators.

  10. Bayesian reconstruction of the cosmological large-scale structure: methodology, inverse algorithms and numerical optimization

    E-Print Network [OSTI]

    Kitaura, F S

    2007-01-01T23:59:59.000Z

    We address the inverse problem of cosmic large-scale structure reconstruction from a Bayesian perspective. For a linear data model, a number of known and novel reconstruction schemes, which differ in terms of the underlying signal prior, data likelihood, and numerical inverse extra-regularization schemes are derived and classified. The Bayesian methodology presented in this paper tries to unify and extend the following methods: Wiener-filtering, Tikhonov regularization, Ridge regression, Maximum Entropy, and inverse regularization techniques. The inverse techniques considered here are the asymptotic regularization, the Jacobi, Steepest Descent, Newton-Raphson, Landweber-Fridman, and both linear and non-linear Krylov methods based on Fletcher-Reeves, Polak-Ribiere, and Hestenes-Stiefel Conjugate Gradients. The structures of the up-to-date highest-performing algorithms are presented, based on an operator scheme, which permits one to exploit the power of fast Fourier transforms. Using such an implementation of t...

  11. 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

  12. An Analysis of a Large Scale Habitat Monitoring Application

    E-Print Network [OSTI]

    Shihada, Basem

    of the Atlantic University of California, Berkeley 2150 Shattuck Avenue 105 Eden St. Berkeley, California 94720 Berkeley, California 94704 Bar Harbor, ME 04609 ABSTRACT Habitat and environmental monitoring is a driving underestimated the impact of multi- hop traffic overhearing and the nuances of power source selection. While

  13. 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

    2012-12-21T23:59:59.000Z

    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.

  14. Small-scale AFBC hot air gas turbine power cycle

    SciTech Connect (OSTI)

    Ashworth, R.A. [Energy and Environmental Research Corp., Orrville, OH (United States); Keener, H.M. [Ohio State Univ., Wooster, OH (United States). Ohio Agricultural Research and Development Center; Hall, A.W. [USDOE Morgantown Energy Technology Center, WV (United States)

    1995-12-31T23:59:59.000Z

    The Energy and Environmental Research Corporation (EER), the Ohio Agricultural Research and Development Center (OARDC), the Will-Burt Company (W-B) and the US Department of Energy (DOE) have successfully developed and completed pilot plant tests on a small scale atmospheric fluidized bed combustion (AFBC) system. This system can be used to generate electricity, and/or hot water, steam. Following successful pilot plant operation, commercial demonstration will take place at Cedar Lane Farms (CLF), near Wooster, Ohio. The system demonstration will be completed by the end of 1995. The project is being funded through a cooperative effort between the DOE, EER, W-B, OARDC, CLF and the Ohio Coal Development Office (OCDO). The small scale AFBC, has no internal heat transfer surfaces in the fluid bed proper. Combining the combustor with a hot air gas turbine (HAGT) for electrical power generation, can give a relatively high overall system thermal efficiency. Using a novel method of recovering waste heat from the gas turbine, a gross heat rate of 13,500 Btu/kWhr ({approximately}25% efficiency) can be achieved for a small 1.5 MW{sub e} plant. A low technology industrial recuperation type gas turbine is used that operates with an inlet blade temperature of 1,450 F and a compression ratio of 3.9:1. The AFBC-HAGT technology can be used to generate power for remote rural communities to replace diesel generators, or can be used for small industrial co-generation applications.

  15. Small-scale AFBC hot air gas turbine power cycle

    SciTech Connect (OSTI)

    Ashworth, R.A. [Energy and Environmental Research Corp., Orrville, OH (United States); Keener, H.M. [Ohio State Univ., Wooster, OH (United States). Ohio Agricultural Research and Development Center; Hall, A.W. [Dept. of Energy, Morgantown, WV (United States). Morgantown Energy Technology Center

    1995-12-31T23:59:59.000Z

    The Energy and Environmental Research Corporation (EER), the Ohio Agricultural Research and Development Center (OARDC), the Will-Burt Company (W-B) and the US Department of Energy (DOE) have successfully developed and completed pilot plant tests on a small scale atmospheric fluidized bed combustion (AFBC) system. This system can be used to generate electricity, and/or hot water, steam. Following successful pilot plant operation, commercial demonstration will take place at Cedar Lane Farms (CLF), near Wooster, Ohio. The system demonstration will be completed by the end of 1995. The small scale AFBC, has no internal heat transfer surfaces in the fluid bed proper. Combining the combustor with a hot air gas turbine (HAGT) for electrical power generation, can give a relatively high overall system thermal efficiency. Using a novel method of recovering waste heat from the gas turbine, a gross heat rate of 13,500 Btu/kWhr ({approximately} 25% efficiency) can be achieved for a small 1.5 MW{sub e} plant. A low technology industrial recuperation type gas turbine is used that operates with an inlet blade temperature of 1,450 F and a compression ratio of 3.9:1. The AFBC-HAGT technology can be used to generate power for remote rural communities to replace diesel generators, or can be used for small industrial co-generation applications.

  16. Macroscopic x-ray fluorescence capability for large-scale elemental mapping

    SciTech Connect (OSTI)

    Volz, Heather M [Los Alamos National Laboratory; Havrilla, George J [Los Alamos National Laboratory; Aikin, Jr., Robert M [Los Alamos National Laboratory; Montoya, Velma M [Los Alamos National Laboratory

    2010-01-01T23:59:59.000Z

    A non-destructive method of determining segregation of constituent elements over large length-scales is desired. Compositional information to moderate resolution over centimeters will be powerful not only to validate casting models but also to understand large-scale phenomena during solidification. To this end, they have rebuilt their XRF capability in conjunction with IXRF Systems, Inc. (Houston, TX) to accommodate samples that are much larger than those that typically fit into an XRF instrument chamber (up to 70 cm x 70 cm x 25 cm). This system uses a rhodium tube with maximum power of 35 kV and 100 {mu}A, the detector is a liquid nitrogen cooled lithium drifted silicon detector, and the smallest spot size is approximately 0.4 mm. Reference standard specimens will enable quantitative elemental mapping and analysis. Challenges to modifying the equipment are described. Non-uniformities in the Inconel 718 system will be shown and discussed. As another example, segregation of niobium or molybdenum in depleted uranium (DU) castings has been known to occur based on wet chemical anslysis (ICP-MS), but this destructive and time-consuming measurement is not practical for routine inspection of ingots. The U-Nb system is complicated due to overlap of the Nb K-alpha line with the U L-beta. Preliminary quantitative results are included on the distribution of Nb across slices from DU castings with different cooling rates. They foresee this macro-XRF elemental mapping capability to prove invaluable to many in the materials processing industry.

  17. 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

  18. 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 storage system in the near future. Broader context With the rapid development of renewable energy sources

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

    E-Print Network [OSTI]

    Knowles, David William

    A Topological Framework for the Interactive Exploration of Large Scale Turbulent Combustion Peer a new topological framework for the analysis of large scale, time-varying, turbulent combustion consumption thresh- olds for an entire time-dependent combustion simulation. By computing augmented merge

  20. Wireless Ventilation Control for Large-Scale Systems: the Mining Industrial Case

    E-Print Network [OSTI]

    Boyer, Edmond

    Wireless Ventilation Control for Large-Scale Systems: the Mining Industrial Case E. Witrant1,, A. D, for large scale systems with high environmental impact: the mining ventilation control systems. Ventilation). We propose a new model for underground ventilation. The main components of the system dynamics

  1. Parallelisation of the revised simplex method for general large scale LP problems

    E-Print Network [OSTI]

    Hall, Julian

    Parallelisation of the revised simplex method for general large scale LP problems Julian Hall School of Mathematics University of Edinburgh August 9­10 2005 Parallelisation of the revised simplex method for general large scale LP problems #12;Overview · The (standard and revised) simplex method

  2. 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

  3. Random Features for Large-Scale Kernel Machines Intel Research Seattle

    E-Print Network [OSTI]

    Kim, Tae-Kyun

    Random Features for Large-Scale Kernel Machines Ali Rahimi Intel Research Seattle Seattle, WA 98105 products of the transformed data are approximately equal to those in the feature space of a user specified on their ability to approximate various radial basis kernels, and show that in large-scale classification

  4. Hash-SVM: Scalable Kernel Machines for Large-Scale Visual Classification , Shih-Fu Chang

    E-Print Network [OSTI]

    Chang, Shih-Fu

    Hash-SVM: Scalable Kernel Machines for Large-Scale Visual Classification Yadong Mu , Gang Hua , Wei the efficiency of non-linear kernel SVM in very large scale visual classification prob- lems. Our key idea be transformed into solving a linear SVM over the hash bits. The proposed Hash-SVM enjoys dramatic storage cost

  5. Automatic Construction of Large-Scale Regular Expression Matching Engines on FPGA

    E-Print Network [OSTI]

    Prasanna, Viktor K.

    Automatic Construction of Large-Scale Regular Expression Matching Engines on FPGA Yi-Hua E. Yang@usc.edu, prasanna@usc.edu Abstract--We present algorithms for implementing large-scale regular expression matching (REM) on FPGA. Based on the proposed algorithms, we develop tools that first transform regular

  6. Evaluation of Segmentation Techniques for Inventory Management in Large Scale Multi-Item Inventory Systems1

    E-Print Network [OSTI]

    Rossetti, Manuel D.

    1 Evaluation of Segmentation Techniques for Inventory Management in Large Scale Multi-Item Inventory Systems1 Manuel D. Rossetti2 , Ph. D., P. E. Department of Industrial Engineering University of their inventory policies in a large-scale multi-item inventory system. Conventional inventory segmentation

  7. 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

  8. 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

  9. 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

  10. LARGE-SCALE MOVEMENT PATTERNS OF MALE LOGGERHEAD SEA TURTLES (CARETTA CARETTA)

    E-Print Network [OSTI]

    LARGE-SCALE MOVEMENT PATTERNS OF MALE LOGGERHEAD SEA TURTLES (CARETTA CARETTA) IN SHARK BAY Management Title of Thesis: Large-Scale Movement Patterns of Male Loggerhead Sea Turtles (Caretta caretta) in Shark Bay, Australia Report No. 524 Examining Committee: Chair: Christine Gruman Master of Resource

  11. GridMate: A Portable Simulation Environment for Large-Scale Adaptive Scientific Applications

    E-Print Network [OSTI]

    Li, Xiaolin "Andy"

    GridMate: A Portable Simulation Environment for Large-Scale Adaptive Scientific Applications: parashar@caip.rutgers.edu Abstract--In this paper, we present a portable sim- ulation environment GridMate for large-scale adaptive scientific applications in multi-site Grid environments. GridMate is a discrete

  12. PENMAN Upper Model Building a LargeScale Knowledge Base for Machine Translation

    E-Print Network [OSTI]

    Knight, Kevin

    f g et al. Abstract PENMAN Upper Model Building a Large­Scale Knowledge Base for Machine­ gineer to build up an index to a KB in a second language, such as Spanish or Japanese. USC is a three­site collabora­ tive effort to build a large­scale knowledge­based ma­ chine translation system

  13. 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

  14. Large-Scale Integration of Deferrable Demand and Renewable Energy Sources

    E-Print Network [OSTI]

    Oren, Shmuel S.

    1 Large-Scale Integration of Deferrable Demand and Renewable Energy Sources Anthony Papavasiliou. In order to accurately assess the impacts of renewable energy integration and demand response integration model for assessing the impacts of the large-scale integration of renewable energy sources

  15. 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

  16. GCP: Gossip-based Code Propagation for Large-scale Mobile Wireless Sensor Network

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    GCP: Gossip-based Code Propagation for Large-scale Mobile Wireless Sensor Network Name: Yann Busnel-Marie Kermarrec Extended abstract Wireless sensor networks (WSN) are in a plentiful expansion. They are expected transmission. Keywords Wireless sensor network, mobile computing, large scale, diusion, software update

  17. Autonomous and Energy-Aware Management of Large-Scale Cloud Infrastructures

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Autonomous and Energy-Aware Management of Large-Scale Cloud Infrastructures Eugen Feller Advisor.e. self-organization and healing); (3) energy-awareness. However, existing open-source cloud management, and energy-aware resource management frameworks for large-scale cloud infrastructures. Particularly, a novel

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

    E-Print Network [OSTI]

    Holberton, Rebecca L.

    Large Scale Wind Turbine Siting Map Report NJ Department of Environmental Protection September 8 Jersey Department of Environmental Protection's (NJDEP) "Large Scale Wind Turbine Siting Map Management rules to address the development and permitting of wind turbines in the coastal zone

  19. Evaluating the Potential for Large-Scale Biodiesel Deployments in a Global Context

    E-Print Network [OSTI]

    Wisconsin at Madison, University of

    Evaluating the Potential for Large-Scale Biodiesel Deployments in a Global Context by Matthew Johnston. All rights reserved. #12;#12;Evaluating the Potential for Large-Scale Biodiesel Deployments on the subject of biodiesel, but I can only hope she takes comfort knowing now much I appreciate everything she

  20. On the Evolution of Thermonuclear Flames on Large Scales

    E-Print Network [OSTI]

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

    2006-10-05T23:59:59.000Z

    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.

  1. Large-Scale Urban Modeling by Combining Ground Level Panoramic and Aerial Imagery

    E-Print Network [OSTI]

    Shahabi, Cyrus

    building or part of a build- ing. Due to error propagation, they are difficult to scale up to model aerial image, we can identify the footprints(up to a common scale) of the buildings, in- cluding of multiple tall buildings. Existing methods for large-scale modeling mostly de- pend on remote sensing

  2. The Large Scale Roll-Out of Electric Vehicles

    E-Print Network [OSTI]

    Talaei, Alireza; Begg, Katherine; Jamasb, Tooraj

    2012-10-26T23:59:59.000Z

    , biomass power plant, nuclear, imported electricity, coal steam turbine, heavy fuel oil steam turbine and natural gas combined cycle (Vuorinen, 2007). In 2007, nuclear and renewable were the main sources which were used to generate up to 17 GW and 20 GW... factor from such a plant is between 350 and 450 g/kWh. Our calculations (for 2010) are in line with the CO2 emission factor of a typical gas turbine power plant operating in the UK in 2010. 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0 1 2 3 4 5 6 7 8 9 10 11 12...

  3. Technology Survey and Performance Scaling for the Design of High Power Nuclear Electric Power and Propulsion Systems

    E-Print Network [OSTI]

    , use of electric primary propulsion in flight systems has been limited to low-power, solar electric thruster output power are identified. Design evolutions are presented for three thrusters that would1 Technology Survey and Performance Scaling for the Design of High Power Nuclear Electric Power

  4. Improved Bounds for Large Scale Capacitated Arc Routing Problem

    E-Print Network [OSTI]

    2011-09-29T23:59:59.000Z

    ply a modified Iterated Local Search procedure to Capacitated Vehicle .... enter and leave the set S, in such a way that at least 2k(S) ? |?R(S)| times an ...... algorithm clearly outperformed, in terms of solution quality, those that dealt with large.

  5. 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

  6. Gravity Scaling of a Power Reactor Water Shield

    SciTech Connect (OSTI)

    Reid, Robert S.; Pearson, J. Boise [NASA Marshall Space Flight Center, Huntsville, AL 35812 (United States)

    2008-01-21T23:59:59.000Z

    Water based reactor shielding is being considered as an affordable option for potential use on initial lunar surface reactor power systems. Heat dissipation in the shield from nuclear sources must be rejected by an auxillary thermal hydraulic cooling system. The mechanism for transferring heat through the shield is natural convection between the core surface and an array of thermosyphon radiator elements. Natural convection in a 100 kWt lunar surface reactor shield design has been previously evaluated at lower power levels (Pearson, 2006). The current baseline assumes that 5.5 kW are dissipated in the water shield, the preponderance on the core surface, but with some volumetric heating in the naturally circulating water as well. This power is rejected by a radiator located above the shield with a surface temperature of 370 K. A similarity analysis on a water-based reactor shield is presented examining the effect of gravity on free convection between a radiation shield inner vessel and a radiation shield outer vessel boundaries. Two approaches established similarity: 1) direct scaling of Rayleigh number equates gravity-surface heat flux products, 2) temperature difference between the wall and thermal boundary layer held constant on Earth and the Moon. Nussult number for natural convection (laminar and turbulent) is assumed of form Nu = CRa{sup n}. These combined results estimate similarity conditions under Earth and Lunar gravities. The influence of reduced gravity on the performance of thermosyphon heat pipes is also examined.

  7. J.C. Rajapakse, L. Wong, and R. Acharya (Eds): PRIB 2006, LNBI 4146, pp. 163-173, Springer, Berlin/Heidelberg Image and fractal information processing for large-scale

    E-Print Network [OSTI]

    Benuskova, Luba

    discovery and large-scale genome comparisons, as powerful modern image processing methods can be applied/Heidelberg 1 Image and fractal information processing for large-scale chemoinformatics, genomics analyses Zealand Contact: ilkka.havukkala@aut.ac.nz Abstract Two promising approaches for handling large

  8. Cosmological parameter constraints from SDSS luminous red galaxies: a new treatment of large-scale clustering

    E-Print Network [OSTI]

    Ariel G. Sanchez; M. Crocce; A. Cabre; C. M. Baugh; E. Gaztanaga

    2009-08-19T23:59:59.000Z

    We apply a new model for the spherically averaged correlation function at large pair separations to the measurement of the clustering of luminous red galaxies (LRGs) made from the SDSS by Cabre and Gaztanaga(2009). Our model takes into account the form of the BAO peak and the large scale shape of the correlation function. We perform a Monte Carlo Markov chain analysis for different combinations of datasets and for different parameter sets. When used in combination with a compilation of the latest CMB measurements, the LRG clustering and the latest supernovae results give constraints on cosmological parameters which are comparable and in remarkably good agreement, resolving the tension reported in some studies. The best fitting model in the context of a flat, Lambda-CDM cosmology is specified by Omega_m=0.261+-0.013, Omega_b=0.044+-0.001, n_s=0.96+-0.01, H_0=71.6+-1.2 km/s/Mpc and sigma_8=0.80+-0.02. If we allow the time-independent dark energy equation of state parameter to vary, we find results consistent with a cosmological constant at the 5% level using all data sets: w_DE=-0.97+-0.05. The large scale structure measurements by themselves can constrain the dark energy equation of state parameter to w_DE=-1.05+-0.15, independently of CMB or supernovae data. We do not find convincing evidence for an evolving equation of state. We provide a set of "extended distance priors" that contain the most relevant information from the CMB power spectrum and the shape of the LRG correlation function which can be used to constrain dark energy models and spatial curvature. Our model should provide an accurate description of the clustering even in much larger, forthcoming surveys, such as those planned with NASA's JDEM or ESA's Euclid mission.

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

    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 onYouTube YouTube Note: Since the YouTube|6721 Federal Register /ofConcentrating Solar PowerDepartment of

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

    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHigh SchoolIn12electron 9 5 - -/e),,sand CERNLandLargefor High Energy

  11. Microsoft Word - Vit Plant Large Scale Testing_20110901.doc

    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHighandSWPA / SPRA / USACE625 FINALOptimizationForArticle from theSept. 1,

  12. Ice Dome Construction for Large Scale Habitats on Atmosphereless Bodies

    E-Print Network [OSTI]

    Farr, Stefan Harsan

    2013-01-01T23:59:59.000Z

    One of the greatest difficulties that space exploration faces is the lack of technology necessary to establish large volumes of habitable spaces on site. Both transporting the pre-built enclosures or transporting the equipment necessary for building them on site from conventional materials face the same enormous problem: the need to transport huge quantities of material into space, which is technically close to impossible. The current paper, explores the possibility and one approach of building these large spaces from an alternative material, water ice, a material that is a prerequisite for any settlement. The feasibility of dome shaped, pressurized, water ice buildings is analyzed from a structural integrity point of view and the possibility of building them with a technique using water sublimation and deposition onto a thin plastic film, a process which requires extremely little construction equipment with respect to the resulting habitable space.

  13. Utility-Scale Silicon Carbide Semiconductor: Monolithic Silicon Carbide Anode Switched Thyristor for Medium Voltage Power Conversion

    SciTech Connect (OSTI)

    None

    2010-09-01T23:59:59.000Z

    ADEPT Project: GeneSiC is developing an advanced silicon-carbide (SiC)-based semiconductor called an anode-switched thyristor. This low-cost, compact SiC semiconductor conducts higher levels of electrical energy with better precision than traditional silicon semiconductors. This efficiency will enable a dramatic reduction in the size, weight, and volume of the power converters and electronic devices it's used in.GeneSiC is developing its SiC-based semiconductor for utility-scale power converters. Traditional silicon semiconductors can't process the high voltages that utility-scale power distribution requires, and they must be stacked in complicated circuits that require bulky insulation and cooling hardware. GeneSiC's semiconductors are well suited for high-power applications like large-scale renewable wind and solar energy installations.

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

    SciTech Connect (OSTI)

    Coughlin, Katie; Eto, J.H.

    2010-12-20T23:59:59.000Z

    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.

  15. Large-Scale Molecular Dynamics Simulations for Highly Parallel Infrastructures

    E-Print Network [OSTI]

    Pazúriková, Jana

    2014-01-01T23:59:59.000Z

    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...

  16. Large Scale Computing and Storage Requirements for Nuclear Physics

    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of Science (SC)Integrated Codes |Is Your Home asLCLSLaboratoryRowland toShadeEnvironmental Large

  17. Edit paper Methods for Large Scale Hydraulic Fracture Monitoring

    E-Print Network [OSTI]

    Ely, Gregory

    2013-01-01T23:59:59.000Z

    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...

  18. Feasibility of Large-Scale Ocean CO2 Sequestration

    SciTech Connect (OSTI)

    Peter Brewer

    2008-08-31T23:59:59.000Z

    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.

  19. Impact of Large Scale Energy Efficiency Programs On Consumer Tariffs and Utility Finances in India

    SciTech Connect (OSTI)

    Abhyankar, Nikit; Phadke, Amol

    2011-01-20T23:59:59.000Z

    Large-scale EE programs would modestly increase tariffs but reduce consumers' electricity bills significantly. However, the primary benefit of EE programs is a significant reduction in power shortages, which might make these programs politically acceptable even if tariffs increase. To increase political support, utilities could pursue programs that would result in minimal tariff increases. This can be achieved in four ways: (a) focus only on low-cost programs (such as replacing electric water heaters with gas water heaters); (b) sell power conserved through the EE program to the market at a price higher than the cost of peak power purchase; (c) focus on programs where a partial utility subsidy of incremental capital cost might work and (d) increase the number of participant consumers by offering a basket of EE programs to fit all consumer subcategories and tariff tiers. Large scale EE programs can result in consistently negative cash flows and significantly erode the utility's overall profitability. In case the utility is facing shortages, the cash flow is very sensitive to the marginal tariff of the unmet demand. This will have an important bearing on the choice of EE programs in Indian states where low-paying rural and agricultural consumers form the majority of the unmet demand. These findings clearly call for a flexible, sustainable solution to the cash-flow management issue. One option is to include a mechanism like FAC in the utility incentive mechanism. Another sustainable solution might be to have the net program cost and revenue loss built into utility's revenue requirement and thus into consumer tariffs up front. However, the latter approach requires institutionalization of EE as a resource. The utility incentive mechanisms would be able to address the utility disincentive of forgone long-run return but have a minor impact on consumer benefits. Fundamentally, providing incentives for EE programs to make them comparable to supply-side investments is a way of moving the electricity sector toward a model focused on providing energy services rather than providing electricity.

  20. 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

  1. Notes and Proposed Guidelines on Updated Seismic Codes in Ethiopia -Implications for Large-Scale Infrastructures

    E-Print Network [OSTI]

    Kassegne, Samuel Kinde

    such as dams, power-plants, highway roads, water reservoirs, and expansion of railways either coming online-scale engineering infrastructure works such as mass-housing, water-supply reservoirs, power-plants, dams, new cities,2,3]. In addition to a multitude of other threats that this population growth could bring, the issue of housing

  2. Capacitor placement and real time control in large-scale unbalanced distribution systems: Numerical studies

    SciTech Connect (OSTI)

    Wang, J.C.; Chiang, H.D.; Miu, K.N. [Cornell Univ., Ithaca, NY (United States). School of Electrical Engineering; Darling, G. [NYSEG Corp., Binghamton, NY (United States). Distribution System Dept.

    1997-04-01T23:59:59.000Z

    A novel solution algorithm for capacitor placement and real-time control in real large-scale unbalanced distribution systems is evaluated and implemented to determine the number, locations, sizes, types and control schemes of capacitors to be placed on large-scale unbalanced distribution systems. A detailed numerical study regarding the solution algorithm in large scale unbalanced distribution systems is undertaken. Promising numerical results on both 292 bus and 394 bus real unbalanced distribution systems containing unbalanced loads and phasing and various types of transformers are presented. The computational performance for the capacitor control problem under load variations is encouraging.

  3. 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))

    1994-03-01T23:59:59.000Z

    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.

  4. Can Power-Law Scaling and Neuronal Avalanches Arise from Stochastic Dynamics?

    E-Print Network [OSTI]

    Destexhe, Alain

    Can Power-Law Scaling and Neuronal Avalanches Arise from Stochastic Dynamics? Jonathan Touboul1 evidenced by a power-law scaling of event size distributions, which can be measured by linear regression activity and show that event size distributions defined as negative LFP peaks can be close to power

  5. The role of large-scale, extratropical dynamics in climate change

    SciTech Connect (OSTI)

    Shepherd, T.G. [ed.

    1994-02-01T23:59:59.000Z

    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.

  6. Efficient Power Converters for PV Arrays : Scalable Submodule Power Conversion for Utility-Scale Photovoltaics

    SciTech Connect (OSTI)

    None

    2012-02-23T23:59:59.000Z

    Solar ADEPT Project: SolarBridge is developing a new power conversion technique to improve the energy output of PV power plants. This new technique is specifically aimed at large plants where many solar panels are connected together. SolarBridge is correcting for the inefficiencies that occur when two solar panels that encounter different amounts of sun are connected together. In most conventional PV system, the weakest panel limits the energy production of the entire system. That’s because all of the energy collected by the PV system feeds into a single collection point where a central inverter then converts it into useable energy for the grid. SolarBridge has found a more efficient and cost-effective way to convert solar energy, correcting these power differences before they reach the grid.

  7. advanced large power: Topics by E-print Network

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

    . . . . 18 3.4.1 Heat Exchanger - Code description . . . . . . . . . . . . . . . 18 3.4.2 Simulation ResultsADVANCED POWER PLANT MODELING WITH APPLICATIONS TO THE ADVANCED BOILING...

  8. 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 a database of potential wind power sites and detailed, time-dependent estimates of the power that would the nation's bountiful wind and solar resources, it is critical to know how much electrical power from

  9. Impacts of Large Amounts of Wind Power on Design and Operation...

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

    Impacts of Large Amounts of Wind Power on Design and Operation of Power Systems; Results of IEA Collaboration B. Parsons and E. Ela National Renewable Energy Laboratory, USA H....

  10. 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

  11. 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

  12. Programmable window : a large-scale transparent electronic display using SPD film

    E-Print Network [OSTI]

    Ramos, Martin (Ramos Rizo-Patron)

    2004-01-01T23:59:59.000Z

    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 ...

  13. A multiperiod optimization model to schedule large-scale petroleum development projects

    E-Print Network [OSTI]

    Husni, Mohammed Hamza

    2009-05-15T23:59:59.000Z

    This dissertation solves an optimization problem in the area of scheduling large-scale petroleum development projects under several resources constraints. The dissertation focuses on the application of a metaheuristic search Genetic Algorithm (GA...

  14. Large scale oceanic circulation and fluxes of freshwater, heat, nutrients and oxygen

    E-Print Network [OSTI]

    Ganachaud, Alexandre Similien, 1970-

    2000-01-01T23:59:59.000Z

    A new, global inversion is used to estimate the large scale oceanic circulation based on the World Ocean Circulation Experiment and Java Australia Dynamic Experiment hydrographic data. A linear inverse "box" model is used ...

  15. A randomized Mirror-Prox method for solving structured large-scale ...

    E-Print Network [OSTI]

    2011-12-06T23:59:59.000Z

    Dec 6, 2011 ... value optimization, large-scale problems, matrix exponentiation .... conclusions are demonstrated by numerical evidence: for solving problems (up to ...... To build such a procedure, we can specify T = T(?) in such a way.

  16. Fault prophet : a fault injection tool for large scale computer systems

    E-Print Network [OSTI]

    Tchwella, Tal

    2014-01-01T23:59:59.000Z

    In this thesis, I designed and implemented a fault injection tool, to study the impact of soft errors for large scale systems. Fault injection is used as a mechanism to simulate soft errors, measure the output variability ...

  17. LARGE SCALE PERMEABILITY TEST OF THE GRANITE IN THE STRIPA MINE AND THERMAL CONDUCTIVITY TEST

    E-Print Network [OSTI]

    Lundstrom, L.

    2011-01-01T23:59:59.000Z

    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

  18. Census: Location-Aware Membership Management for Large-Scale Distributed Systems

    E-Print Network [OSTI]

    Cowling, James Alexander

    We present Census, a platform for building large-scale distributed applications. Census provides a membership service and a multicast mechanism. The membership service provides every node with a consistent view of the ...

  19. Model-constrained optimization methods for reduction of parameterized large-scale systems

    E-Print Network [OSTI]

    Bui-Thanh, Tan

    2007-01-01T23:59:59.000Z

    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. 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 ...

  1. Large-Scale Mapping and Validation of Escherichia coli Transcriptional Regulation

    E-Print Network [OSTI]

    Collins, James J.

    Large-Scale Mapping and Validation of Escherichia coli Transcriptional Regulation from a Compendium Bioinformatics Program, Boston University, Boston, Massachusetts, United States of America, 2 Department of Biomedical Engineering, Boston University, Boston, Massachusetts, United States of America, 3 Boston

  2. A statistical learning framework for data mining of large-scale systems : algorithms, implementation, and applications

    E-Print Network [OSTI]

    Tsou, Ching-Huei, 1973-

    2007-01-01T23:59:59.000Z

    A machine learning framework is presented that supports data mining and statistical modeling of systems that are monitored by large-scale sensor networks. The proposed algorithm is novel in that it takes both observations ...

  3. 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:...

  4. Chemical engineers design, control and optimize large-scale chemical, physicochemical and

    E-Print Network [OSTI]

    Rohs, Remo

    , Biochemical, Environmental, Petroleum Engineering and Nantoechnology. CHEMICAL&MATERIALSSCIENCE CHE OVERVIEW of Science 131 units · Chemical Engineering (Petroleum) Bachelor of Science 136 units · Chemical Engineering38 Chemical engineers design, control and optimize large-scale chemical, physicochemical

  5. Bridging the Gap Between Commissioning Measures and Large Scale Retrofits in Existing Buildings

    E-Print Network [OSTI]

    Bynum, J.; Jones, A.; Claridge, D.E.

    2011-01-01T23:59:59.000Z

    Most often commissioning of existing buildings seeks to reduce a building's energy consumption by implementation of operational changes via the existing equipment. In contrast, large scale capital retrofits seek to make major changes...

  6. Bridging the Gap Between Commissioning Measures and Large Scale Retrofits in Existing Buildings

    E-Print Network [OSTI]

    Bynum, J.; Jones, A.; Claridge, D. E.

    Most often commissioning of existing buildings seeks to reduce a building’s energy consumption by implementation of operational changes via the existing equipment. In contrast, large scale capital retrofits seek to make major changes to the systems...

  7. Membraneless hydrogen bromine laminar flow battery for large-scale energy storage

    E-Print Network [OSTI]

    Braff, William Allan

    2014-01-01T23:59:59.000Z

    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 ...

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

    SciTech Connect (OSTI)

    David Wenzhong Gao

    2012-09-30T23:59:59.000Z

    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

  9. Large scale test rig for flow visualization and leakage measurement of labyrinth seals

    E-Print Network [OSTI]

    Broussard, Daniel Harold

    1991-01-01T23:59:59.000Z

    LARGE SCALE TEST RIG FOR FLOW VISUALIZATION AND LEAKAGE MEASUREMENT OF LABYRINTH SEALS A Thesis by DANIEL HAROLD BROUSSARD Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of requirements for degree... of MASTER OF SCIENCE December 1991 Major Subject: Mechanical Engineering LARGE SCALE TEST RIG FOR FLOW VISUALIZATION AND LEAKAGE MEASUREMENT OF LABYRINTH SEALS A Thesis by DANIEL HAROLD BROUSSARD Approved as to style and content by: David L. Rhode...

  10. Power-law scaling of asymmetries in viscous flow with PT-symmetric inflow and outflow

    E-Print Network [OSTI]

    Huidan; Yu; Xi Chen; Yousheng Xu; Yogesh N. Joglekar

    2014-10-13T23:59:59.000Z

    In recent years, open systems with balanced loss and gain, that are invariant under the combined parity and time-reversal ($\\mathcal{PT}$) operations, have been studied via asymmetries of their solutions. They represent systems as diverse as coupled optical waveguides and electrical or mechanical oscillators. We numerically investigate the asymmetries of incompressible viscous flow in two and three dimensions with "balanced" inflow-outflow ($\\mathcal{PT}$-symmetric) configurations. By introducing configuration-dependent classes of asymmetry functions in velocity, kinetic energy density, and vorticity fields, we find that the flow asymmetries exhibit power-law scaling with a single exponent in the laminar regime with the Reynolds number ranging over four decades. We show that such single-exponent scaling is expected for small Reynolds numbers, although its robustness at large values of Reynolds numbers is unexpected. Our results imply that $\\mathcal{PT}$-symmetric inflow-outflow configurations provide a hitherto unexplored avenue to tune flow properties.

  11. Large-Scale Analysis of Individual and Task Differences in Search Result Page Examination Strategies

    E-Print Network [OSTI]

    Dumais, Susan

    Large-Scale Analysis of Individual and Task Differences in Search Result Page Examination users examine results which are similar to those observed in small-scale studies. Our findings have differences on search result page examination strategies is important in develop- ing improved search engines

  12. 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

  13. Personal Workspace for Large-Scale Data-Driven Computational Experiment

    E-Print Network [OSTI]

    Plale, Beth

    's personal workspace is a virtual repository of a user's data products. Its conceptual space is organizedPersonal Workspace for Large-Scale Data-Driven Computational Experiment Yiming Sun, Scott Jensen@cs.indiana.edu plale@cs.indiana.edu Abstract 1 -- As the scale and complexity of data-driven computational science

  14. Communications via Systems-on-Chips Clustering in Large-Scaled Sensor Networks

    E-Print Network [OSTI]

    Fan, Jeffrey

    node, the large-scaled senor network is proposed to be transformed into a maze diagram by a user of data, including temperature, humidity, pressure, noise levels, vehicular movement, etc to the functionalities of a highly scaled VLSI silicon chip with multi-cored environments. In other words, each SoC has

  15. 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

  16. Wireless power transfer for scaled electronic biomedical implants

    E-Print Network [OSTI]

    Theilmann, Paul Thomas

    2012-01-01T23:59:59.000Z

    S   67 Figure 2.16: Power loss due to induced eddyFigure 4.9: Instantaneous power loss in branch 1 versus time6 slope which describes power loss versus distance for an

  17. Large Power Transformers and the U.S. Electric Grid Report Update...

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

    Reliability has released an update to its 2012 Large Power Transformers and the U.S. Electric Grid report. The new report includes updated information about global electrical...

  18. FACTS Devices for Large Wind Power Plants A. Adamczyk

    E-Print Network [OSTI]

    Teodorescu, Remus

    -of-the-art in FACTS for large WPPs with AC connection is given. FACTS devices (excluding HVDC) with their properties

  19. Design considerations for large space electric power systems

    SciTech Connect (OSTI)

    Renz, D.D.; Finke, R.C.; Stevens, N.J.; Triner, J.E.; Hansen, I.G.

    1983-04-01T23:59:59.000Z

    As power levels of spacecraft rise to the 50 to 100 kW range, it becomes apparent that low voltage (28 V) dc power distribution and management systems will not operate efficiently at these higher power levels. The concept of transforming a solar array voltage at 150 V dc into a 1000 V ac distribution system operating at 20 kHz is examined. The transformation is accomplished with series-resonant inverter by using a rotary transformer to isolate the solar array from the spacecraft. The power can then be distributed in any desired method such as three phase delta to delta. The distribution voltage can be easily transformed to any desired load voltage and operating frequency. The reasons for the voltage limitations on the solar array due to plasma interactions and the many advantages of a high voltage, high frequency at distribution system are discussed.

  20. Mandatory Green Power Option for Large Municipal Utilities

    Broader source: Energy.gov [DOE]

    Municipal electric utilities serving more than 40,000 customers in Colorado must offer an optional green-power program that allows retail customers the choice of supporting emerging renewable...

  1. I/O-Conscious Data Preparation for Large-Scale Web Search Engines

    E-Print Network [OSTI]

    Chiueh, Tzi-cker

    a general technique for efficiently car- rying out large sets of simple transformation or queryingI/O-Conscious Data Preparation for Large-Scale Web Search Engines Maxim Lifantsev Tzi-cker Chiueh of the transformation and querying operations that work with the data. This data and processing partitioning is natu

  2. Facility Location under Demand Uncertainty: Response to a Large-scale Bioterror Attack

    E-Print Network [OSTI]

    Dessouky, Maged

    Facility Location under Demand Uncertainty: Response to a Large-scale Bioterror Attack Abstract In the event of a catastrophic bio-terror attack, major urban centers need to effi- ciently distribute large of a hypothetical anthrax attack in Los Angeles County. Keywords: Capacitated facility location, distance

  3. 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

  4. Aging assessment of large electric motors in nuclear power plants

    SciTech Connect (OSTI)

    Villaran, M.; Subudhi, M. [Brookhaven National Lab., Upton, NY (United States)

    1996-03-01T23:59:59.000Z

    Large electric motors serve as the prime movers to drive high capacity pumps, fans, compressors, and generators in a variety of nuclear plant systems. This study examined the stressors that cause degradation and aging in large electric motors operating in various plant locations and environments. The operating history of these machines in nuclear plant service was studied by review and analysis of failure reports in the NPRDS and LER databases. This was supplemented by a review of motor designs, and their nuclear and balance of plant applications, in order to characterize the failure mechanisms that cause degradation, aging, and failure in large electric motors. A generic failure modes and effects analysis for large squirrel cage induction motors was performed to identify the degradation and aging mechanisms affecting various components of these large motors, the failure modes that result, and their effects upon the function of the motor. The effects of large motor failures upon the systems in which they are operating, and on the plant as a whole, were analyzed from failure reports in the databases. The effectiveness of the industry`s large motor maintenance programs was assessed based upon the failure reports in the databases and reviews of plant maintenance procedures and programs.

  5. A Minimal Model for Large-scale Epitaxial Growth Kinetics of Graphene

    E-Print Network [OSTI]

    Jiang, Huijun

    2015-01-01T23:59:59.000Z

    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 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

  7. Bayesian reconstruction of the cosmological large-scale structure: methodology, inverse algorithms and numerical optimization

    E-Print Network [OSTI]

    F. S. Kitaura; T. A. Ensslin

    2009-11-06T23:59:59.000Z

    We address the inverse problem of cosmic large-scale structure reconstruction from a Bayesian perspective. For a linear data model, a number of known and novel reconstruction schemes, which differ in terms of the underlying signal prior, data likelihood, and numerical inverse extra-regularization schemes are derived and classified. The Bayesian methodology presented in this paper tries to unify and extend the following methods: Wiener-filtering, Tikhonov regularization, Ridge regression, Maximum Entropy, and inverse regularization techniques. The inverse techniques considered here are the asymptotic regularization, the Jacobi, Steepest Descent, Newton-Raphson, Landweber-Fridman, and both linear and non-linear Krylov methods based on Fletcher-Reeves, Polak-Ribiere, and Hestenes-Stiefel Conjugate Gradients. The structures of the up-to-date highest-performing algorithms are presented, based on an operator scheme, which permits one to exploit the power of fast Fourier transforms. Using such an implementation of the generalized Wiener-filter in the novel ARGO-software package, the different numerical schemes are benchmarked with 1-, 2-, and 3-dimensional problems including structured white and Poissonian noise, data windowing and blurring effects. A novel numerical Krylov scheme is shown to be superior in terms of performance and fidelity. These fast inverse methods ultimately will enable the application of sampling techniques to explore complex joint posterior distributions. We outline how the space of the dark-matter density field, the peculiar velocity field, and the power spectrum can jointly be investigated by a Gibbs-sampling process. Such a method can be applied for the redshift distortions correction of the observed galaxies and for time-reversal reconstructions of the initial density field.

  8. NV Energy Large-Scale Photovoltaic Integration Study: Intra-Hour Dispatch and AGC Simulation

    SciTech Connect (OSTI)

    Lu, Shuai; Etingov, Pavel V.; Meng, Da; Guo, Xinxin; Jin, Chunlian; Samaan, Nader A.

    2013-01-02T23:59:59.000Z

    The uncertainty and variability with photovoltaic (PV) generation make it very challenging to balance power system generation and load, especially under high penetration cases. Higher reserve requirements and more cycling of conventional generators are generally anticipated for large-scale PV integration. However, whether the existing generation fleet is flexible enough to handle the variations and how well the system can maintain its control performance are difficult to predict. The goal of this project is to develop a software program that can perform intra-hour dispatch and automatic generation control (AGC) simulation, by which the balancing operations of a system can be simulated to answer the questions posed above. The simulator, named Electric System Intra-Hour Operation Simulator (ESIOS), uses the NV Energy southern system as a study case, and models the system’s generator configurations, AGC functions, and operator actions to balance system generation and load. Actual dispatch of AGC generators and control performance under various PV penetration levels can be predicted by running ESIOS. With data about the load, generation, and generator characteristics, ESIOS can perform similar simulations and assess variable generation integration impacts for other systems as well. This report describes the design of the simulator and presents the study results showing the PV impacts on NV Energy real-time operations.

  9. A SUBSPACE APPROACH TO FAULT DIAGNOSTICS IN LARGE POWER SYSTEMS

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    and to fast detect and identify possible failures. In this article, we focus on failures in power lines which translate in sudden changes in the electric impedance. To keep track of the current flowing in the line), transmission line states are only refreshed on an hourly basis [1]. For rather static systems, the au- thors

  10. Obtaining the right large power transformer for a hydro plant

    SciTech Connect (OSTI)

    Clemen, D.M. [Harza Engineering Company, Chicago, IL (United States)

    1995-07-01T23:59:59.000Z

    Transformer efficiency and reliability are important factors in determining the productivity of a hydroelectric generating plant. A well-supervised testing program can help plant owners and engineers improve the quality of equipment installed at their plant. This paper addresses such a program as applied to the selection of the generator step-up, or main power, transformer at a hydroelectric generating station.

  11. Simulation of one-minute power output from utility-scale photovoltaic generation systems.

    SciTech Connect (OSTI)

    Stein, Joshua S.; Ellis, Abraham; Hansen, Clifford W.

    2011-08-01T23:59:59.000Z

    We present an approach to simulate time-synchronized, one-minute power output from large photovoltaic (PV) generation plants in locations where only hourly irradiance estimates are available from satellite sources. The approach uses one-minute irradiance measurements from ground sensors in a climatically and geographically similar area. Irradiance is translated to power using the Sandia Array Performance Model. Power output is generated for 2007 in southern Nevada are being used for a Solar PV Grid Integration Study to estimate the integration costs associated with various utility-scale PV generation levels. Plant designs considered include both fixed-tilt thin-film, and single-axis-tracked polycrystalline Si systems ranging in size from 5 to 300 MW{sub AC}. Simulated power output profiles at one-minute intervals were generated for five scenarios defined by total PV capacity (149.5 MW, 222 WM, 292 MW, 492 MW, and 892 MW) each comprising as many as 10 geographically separated PV plants.

  12. IEEE TRANSACTIONS ON VERY LARGE SCALE INTEGRATION (VLSI) SYSTEMS, VOL. XX, NO. Y, MONTH 2005 1 A VLSI Architecture for Visible Watermarking in a

    E-Print Network [OSTI]

    Mohanty, Saraju P.

    IEEE TRANSACTIONS ON VERY LARGE SCALE INTEGRATION (VLSI) SYSTEMS, VOL. XX, NO. Y, MONTH 2005 1 is implemented using 0.35µ technology, which consumes 6.9mW power while operating at 292MHz. Index Terms is in spatial domain, discrete cosine transformed, or wavelet transformed, water- marks of varying degree

  13. 14 IEEE TRANSACTIONS ON VERY LARGE SCALE INTEGRATION (VLSI) SYSTEMS, VOL. 16, NO. 1, JANUARY 2008 A Medium-Grain Reconfigurable Architecture for

    E-Print Network [OSTI]

    Delgado-Frias, José G.

    14 IEEE TRANSACTIONS ON VERY LARGE SCALE INTEGRATION (VLSI) SYSTEMS, VOL. 16, NO. 1, JANUARY 2008 benchmarks, ranging from floating-point arithmetic to a radix-4 fast fourier transform. The results-intensive algorithms place great demands on the processing power of the underlying hardware. As tech- nology continues

  14. DECENTRALIZED REAL-TIME MANAGEMENT LARGELY UNPREDICTABLE POWER NEEDS AND SUPPLY

    E-Print Network [OSTI]

    Wedde, Horst F.

    of unpredictable power need and supply situations. We model a representative scenario to explain variousDECENTRALIZED REAL-TIME MANAGEMENT OF LARGELY UNPREDICTABLE POWER NEEDS AND SUPPLY H. F. Wedde*, F technologies based on solar or wind power, or on renewable energy sources, is an adequate management

  15. High voltage-high power components for large space power distribution systems

    SciTech Connect (OSTI)

    Renz, D.D.

    1984-08-01T23:59:59.000Z

    For over a decade, Lewis Research Center has been developing space power components. These components include a family of bi-polar power switching transistors, fast switching power diodes, heat pipe cooled high-frequency transformers and inductors, high frequency conduction cooled transformers, high powerhigh frequency capacitors, remote power controllers and rotary power transfer devices. Many of these components such as the power switching transistors, power diodes and the high frequency capacitor are commercially available. All the other components have been developed to the prototype level. Series resonant dc/dc converters have been built to the 25 kW level.

  16. Wireless power transfer for scaled electronic biomedical implants

    E-Print Network [OSTI]

    Theilmann, Paul Thomas

    2012-01-01T23:59:59.000Z

    System Model .. 105 3.3.1 Model Verification . 108 Summary . 112 References .. 113 Chapter 4 Low Power

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

    E-Print Network [OSTI]

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

    2011-01-01T23:59:59.000Z

    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 ...

  18. What Will the Neighbors Think? Building Large-Scale Science Projects Around the World

    ScienceCinema (OSTI)

    Craig Jones, Christian Mrotzek, Nobu Toge and Doug Sarno

    2010-01-08T23:59:59.000Z

    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. [Sandia National Laboratories, Albuquerque, NM; Lloyd, Levi; Minnich, Ronald G.; Vanderveen, Keith; Van Randwyk, Jamie A; Rudish, Don W.

    2008-10-01T23:59:59.000Z

    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. 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

  1. Copyright 2014 IEEE. Reprinted, with permission from: CERTS Microgrid Demonstration With Large-Scale Energy

    E-Print Network [OSTI]

    diesel generators. Adding a 2-MW, 4-MWh storage system, a fast static switch, and a power factor cor-Scale Energy Storage and Renewable Generation Eduardo Alegria, Member, IEEE; Tim Brown, Member, IEEE; Erin and Renewable Generation Eduardo Alegria, Member, IEEE, Tim Brown, Member, IEEE, Erin Minear, Member, IEEE

  2. Particle contamination levels in oil-filled large power transformers

    SciTech Connect (OSTI)

    Oommen, T.V.; Petrie, E.M.

    1983-05-01T23:59:59.000Z

    A study of particle levels in transformer oil was conducted, covering about 200 samples taken from field and factory units. Factory samples were included to determine a relative base condition on which to compare field data. Particle distribution curves show size and count relationship in transformers. The particles were studied also by Atomic Absorption Spectroscopy to measure the content of iron, copper and other common metals expected. Particle analysis can supplement more standard laboratory techniques to judge the condition of oil in operating power transformers. The diagnostic value of such analysis, especially in determining pump performance problems, is illustrated with examples.

  3. Diffuse Pionic Gamma-Ray Emission from Large Scale Structures in the FERMI Era

    E-Print Network [OSTI]

    Aleksandra Dobardzic; Tijana Prodanovic

    2014-04-08T23:59:59.000Z

    For more than a decade now the complete origin of the diffuse gamma-ray emission background (EGRB) has been unknown. Major components like unresolved star-forming galaxies (making SFCR gamma-ray emission are weak (above the observed EGRB) in some case, in others, some of our models can provide a good fit to the observed EGRB. More importantly, we show that these large-scale shocks could still give an important contribution to the EGRB, especially at high energies. Future detections of cluster gamma-ray emission would help place tighter constraints on our models and give us a better insight into large-scale shocks forming around them.

  4. Theory of large-scale turbulent transport of chemically active pollutants

    SciTech Connect (OSTI)

    Chefranov, S.G.

    1986-01-01T23:59:59.000Z

    This paper shows that ordered Turing structures may be produced in the large-scale turbulent mixing of chemically active pollutants as a result of statistical instability of the spatially homogeneous state. Threshold values are obtained for the variance of a random non-Gaussian velocity field, beyond which this statistical instability is realized even in two-component systems with quadratically nonlinear kinetics. The possibility for the formation of large-scale spatially non-homogeneous concentration distributions of chemically active pollutants by this mechanism is examined.

  5. Turbulence Modelling and Stirring Mechanisms in the Cosmological Large-scale Structure

    E-Print Network [OSTI]

    Iapichino, L; Niemeyer, J C; Merklein, J

    2011-01-01T23:59:59.000Z

    FEARLESS (Fluid mEchanics with Adaptively Refined Large Eddy SimulationS) is a numerical scheme for modelling subgrid-scale turbulence in cosmological adaptive mesh refinement simulations. In this contribution, the main features of this tool will be outlined. We discuss the application of this method to cosmological simulations of the large-scale structure. The simulations show that the production of turbulence has a different redshift dependence in the intra-cluster medium and the warm-hot intergalactic medium, caused by the distinct stirring mechanisms (mergers and shock interactions) acting in them. Some properties of the non-thermal pressure support in the two baryon phases are also described.

  6. Hypermodular Self-Assembling Space Solar Power -- Design Option for Mid-Term GEO Utility-Scale Power Plants

    E-Print Network [OSTI]

    Leitgab, Martin

    2013-01-01T23:59:59.000Z

    This paper presents a design for scaleable space solar power systems based on free-flying reflectors and module self-assembly. Lower system cost of utility-scale space solar power is achieved by design independence of yet-to-be-built in-space assembly or transportation infrastructure. Using current and expected near-term technology, this study describe a design for mid-term utility-scale power plants in geosynchronous orbits. High-level economic considerations in the context of current and expected future launch costs are given as well.

  7. Stresa, Italy, 26-28 April 2006 SCALING EFFECTS FOR ELECTROMAGNETIC VIBRATIONAL POWER

    E-Print Network [OSTI]

    Boyer, Edmond

    and structure of these generators have varied and various different power levels have been produced. However of power to wireless sensor systems. In such systems size is an important consideration and it is generallyStresa, Italy, 26-28 April 2006 SCALING EFFECTS FOR ELECTROMAGNETIC VIBRATIONAL POWER GENERATORS

  8. Higher temperature power electronics for larger-scale mechatronic integration

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    temperature" means different things to different applications. In high voltage systems (such as power to hybrid or full electric cars), the cost of the electrical system is higher than the internal combustion. In hybrid vehicles, it is possible to take advantage of the ICE cooling loop to extract heat from the power

  9. Scaling of solid state lasers for satellite power beaming applications

    SciTech Connect (OSTI)

    Friedman, H.W.; Albrecht, G.F.; Beach, R.J.

    1994-01-01T23:59:59.000Z

    The power requirements for a satellite power beaming laser system depend upon the diameter of the beam director, the performance of the adaptive optics system, and the mission requirements. For an 8 meter beam director and overall Strehl ratio of 50%, a 30 kW laser at 850 nm can deliver an equivalent solar flux to a satellite at geostationary orbit. Advances in Diode Pumped Solid State Lasers (DPSSL) have brought these small, efficient and reliable devices to high average power and they should be considered for satellite power beaming applications. Two solid state systems are described: a diode pumped Alexandrite and diode pumped Thulium doped YAG. Both can deliver high average power at 850 nm in a single aperture.

  10. PROBING THE INFLATON: SMALL-SCALE POWER SPECTRUM CONSTRAINTS FROM MEASUREMENTS OF THE COSMIC MICROWAVE BACKGROUND ENERGY SPECTRUM

    SciTech Connect (OSTI)

    Chluba, Jens; Erickcek, Adrienne L.; Ben-Dayan, Ido, E-mail: jchluba@cita.utoronto.ca [Canadian Institute for Theoretical Astrophysics, 60 St. George Street, Toronto, Ontario M5S 3H8 (Canada)

    2012-10-20T23:59:59.000Z

    In the early universe, energy stored in small-scale density perturbations is quickly dissipated by Silk damping, a process that inevitably generates {mu}- and y-type spectral distortions of the cosmic microwave background (CMB). These spectral distortions depend on the shape and amplitude of the primordial power spectrum at wavenumbers k {approx}< 10{sup 4} Mpc{sup -1}. Here, we study constraints on the primordial power spectrum derived from COBE/FIRAS and forecasted for PIXIE. We show that measurements of {mu} and y impose strong bounds on the integrated small-scale power, and we demonstrate how to compute these constraints using k-space window functions that account for the effects of thermalization and dissipation physics. We show that COBE/FIRAS places a robust upper limit on the amplitude of the small-scale power spectrum. This limit is about three orders of magnitude stronger than the one derived from primordial black holes in the same scale range. Furthermore, this limit could be improved by another three orders of magnitude with PIXIE, potentially opening up a new window to early universe physics. To illustrate the power of these constraints, we consider several generic models for the small-scale power spectrum predicted by different inflation scenarios, including running-mass inflation models and inflation scenarios with episodes of particle production. PIXIE could place very tight constraints on these scenarios, potentially even ruling out running-mass inflation models if no distortion is detected. We also show that inflation models with sub-Planckian field excursion that generate detectable tensor perturbations should simultaneously produce a large CMB spectral distortion, a link that could potentially be established with PIXIE.

  11. Cosmological parameters from observational data on the large scale structure of the Universe

    E-Print Network [OSTI]

    B. Novosyadlyj; R. Durrer; S. Apunevych

    2000-09-29T23:59:59.000Z

    The observational data on the large scale structure (LSS) of the Universe are used to determine cosmological parameters within the class of adiabatic inflationary models. We show that a mixed dark matter model with cosmological constant ($\\Lambda$MDM model) and parameters $\\Omega_m=0.37^{+0.25}_{-0.15}$, $\\Omega_{\\Lambda}=0.69^{+0.15}_{-0.20}$, $\\Omega_{\

  12. 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

  13. INORGANIC NANOPARTICLES AS PHASE-CHANGE MATERIALS FOR LARGE-SCALE THERMAL ENERGY STORAGE

    E-Print Network [OSTI]

    Pennycook, Steve

    INORGANIC NANOPARTICLES AS PHASE-CHANGE MATERIALS FOR LARGE- SCALE THERMAL ENERGY STORAGE Miroslaw storage performance. The expected immediate outcome of this effort is the demonstration of high-energy generation at high efficiency could revolutionize the development of solar energy. Nanoparticle-based phase

  14. Comparison of large-scale field-aligned currents under sunlit and dark ionospheric conditions

    E-Print Network [OSTI]

    Higuchi, Tomoyuki

    geomagnetic activity as measured by the IMF BZ component. Result 1 can be partially explained in termsComparison of large-scale field-aligned currents under sunlit and dark ionospheric conditions S-aligned currents (FACs) under sunlit and dark ionospheric conditions. A total of $74,000 auroral oval crossings

  15. SEQUENCING TECHNOLOGIES Microdroplet-based PCR enrichment for large-scale

    E-Print Network [OSTI]

    Rosenberg, Noah

    . Genet. 22 Oct 2009 (doi:10.1016/j.ajhg.2009.09.017) In case­control association studies, imputation.1126/science.1181498) Genome sequencing for large-scale population-based studies requires technologies generated in this study is expected to be a useful resource for examining the molecular characteristics

  16. A Climatology of Tropical Anvil and Its Relationship to the Large-Scale Circulation 

    E-Print Network [OSTI]

    Li, Wei

    2011-02-22T23:59:59.000Z

    of anvil formation, and to provide a more realistic assessment of the radiative impact of tropical anvil on the large-scale circulation. Based on 10 years (1998-2007) of observations, anvil observed by the Tropical Rainfall Measuring Mission (TRMM...

  17. A parallel revised simplex solver for large scale block angular LP problems

    E-Print Network [OSTI]

    Hall, Julian

    A parallel revised simplex solver for large scale block angular LP problems Julian Hall and Edmund Smith School of Mathematics University of Edinburgh 29th July 2010 A parallel revised simplex solver · Revised simplex method for BALP problems Basis matrix and its inversion Solution of linear systems

  18. Energy Evaluation of PMCMTP for Large-Scale Wireless Sensor Networks

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    slots inside each Personal Area Network (PAN)), · Energy balancing and saving to prolong networkEnergy Evaluation of PMCMTP for Large-Scale Wireless Sensor Networks Jamila Ben Slimane, Ye-Qiong Song, Anis Koub^aa§¶ and Mounir Frikha Sup'Com-MEDIATRON, City of Communication Technologies, 2083

  19. Large Scale Volume Rendering in Immersive Environments with Direct Manipulation Widgets

    E-Print Network [OSTI]

    Kniss, Joe Michael

    Large Scale Volume Rendering in Immersive Environments with Direct Manipulation Widgets Master's Thesis Proposal Joe Michael Kniss May 15, 2001 1 Introduction 1.1 Thesis Statement Parallel rendering exploration. 1.2 Motivation Direct volume rendering has proven to be an important visualization tool

  20. Fast Solver for Large Scale Eddy Current Non-Destructive Evaluation Problems

    E-Print Network [OSTI]

    Fast Solver for Large Scale Eddy Current Non-Destructive Evaluation Problems Naiguang Lei Advisor: Lalita Udpa Thursday, July 31st, 2014 9:00-11:00am, EB2219 Abstract Eddy current testing plays a very, an alternating magnetic field source generates induced currents, called eddy currents, in an electrically

  1. CHANGES OF SYSTEM OPERATION COSTS DUE TO LARGE-SCALE WIND INTEGRATION

    E-Print Network [OSTI]

    Model Institute of Energy Economics and the Rational Use of EnergyIER Changes of System Operation CostsCHANGES OF SYSTEM OPERATION COSTS DUE TO LARGE-SCALE WIND INTEGRATION Derk Jan SWIDER1 , Rüdiger-Essen, Germany 3 Risoe International Laboratory, Denmark Business and Policy Track: Integrating wind

  2. Large-scale flow of geofluids at the Dead Sea Rift H. Gvirtzmana,*, E. Stanislavskyb

    E-Print Network [OSTI]

    Gvirtzman, Haim

    that has caused large-scale migration of brine and hydrocarbons at the Dead Sea Rift. Numerical simulations flow directions. The first is a density-driven migration of brine through deep aquifers from the rift reserved. Keywords: Groundwater; Brine; Hydrocarbons; Rift; Dead Sea; Modeling 1. The Dead Sea Rift

  3. Page Digest for Large-Scale Web Services Daniel Rocco, David Buttler, Ling Liu

    E-Print Network [OSTI]

    Rocco, Daniel

    Page Digest for Large-Scale Web Services Daniel Rocco, David Buttler, Ling Liu Georgia Institute this storage and processing efficiently. In this paper, we introduce Page Digest, a mechanism for efficient storage and processing of Web documents. The Page Digest design encourages a clean separation

  4. Large-scale hierarchical optimization for online advertising and wind farm planning

    E-Print Network [OSTI]

    Eskenazi, Maxine

    Large-scale hierarchical optimization for online advertising and wind farm planning Konstantin (particularly, spon- sored search) and wind farm turbine-layout planning. Whereas very different in specifics annealing and integer linear programming as our principled approach. Wind farm layout optimization

  5. Mining Induced Seismicity -Monitoring of a Large Scale Salt Cavern Collapse

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Mining Induced Seismicity - Monitoring of a Large Scale Salt Cavern Collapse E. Klein* (Ineris), I ground failure phenomenon induced by old underground mining works, a field experiment was undertaken in collaboration with the SOLVAY mining company: a solution mine was instrumented in 2004 previously to its

  6. Microfluidic very large scale integration (mVLSI) with integrated micromechanical valves{

    E-Print Network [OSTI]

    Quake, Stephen R.

    Microfluidic very large scale integration (mVLSI) with integrated micromechanical valves{ Ismail40258k Microfluidic chips with a high density of control elements are required to improve device and accessible high-density microfluidic chips, we have fabricated a monolithic PDMS valve architecture

  7. Parameter identification in large-scale models for oil and gas production

    E-Print Network [OSTI]

    Van den Hof, Paul

    Parameter identification in large-scale models for oil and gas production Jorn F.M. Van Doren: Models used for model-based (long-term) operations as monitoring, control and optimization of oil and gas information to the identification problem. These options are illustrated with examples taken from oil and gas

  8. 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

  9. A Large-scale Benchmark Study of Existing Algorithms for Taxonomy-Independent

    E-Print Network [OSTI]

    Slatton, Clint

    A Large-scale Benchmark Study of Existing Algorithms for Taxonomy-Independent Microbial Community sequencing technology have created new op- portunities to probe the hidden world of microbes. Taxonomy: pyrosequencing, 16S rRNA, taxonomy independent analysis, massive data, clustering, microbial diversity estimation

  10. A Scalable Model for Energy Load Balancing in Large-scale Sensor Networks

    E-Print Network [OSTI]

    de Veciana, Gustavo

    A Scalable Model for Energy Load Balancing in Large-scale Sensor Networks Seung Jun Baek we consider how one might achieve more balanced energy burdens across the network by spreading sinks change their locations to balance the energy burdens incurred accross the network nodes [1

  11. 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 for a sustainable energy future? Three teams, UMass, Harvard, and FEEM (Fondazione Eni Enrico Mattei), share a goal technologies to fund for optimal success for a sustainable energy future. Progress and Results · Created models

  12. Polymeric Electro-optic Modulators: From Chromophore Design to Integration with Semiconductor Very Large Scale Integration

    E-Print Network [OSTI]

    Polymeric Electro-optic Modulators: From Chromophore Design to Integration with Semiconductor Very Large Scale Integration Electronics and Silica Fiber Optics L. Dalton, A. Harper, A. Ren, F. Wang, G California, Los Angeles, California 90089-1661 Chromophores with optimized second-order optical nonlinearity

  13. Fluid computation of the performanceenergy trade-off in large scale Markov models

    E-Print Network [OSTI]

    Imperial College, London

    Fluid computation of the performance­energy trade-off in large scale Markov models Anton Stefanek energy consumption while maintaining multiple service level agreements. 2. VIRTUALISED EXECUTION MODEL optimisation. We show how the fluid analysis naturally leads to a constrained global optimisation prob- lem

  14. Wavelet Analysis for a New Multiresolution Model for Large-Scale Textured Terrains

    E-Print Network [OSTI]

    Illes Balears, Universitat de les

    Wavelet Analysis for a New Multiresolution Model for Large-Scale Textured Terrains María José transmission of both geometry and textures of a terrain model. Wavelet Multiresolution Analysis is applied. An innovative texture synthesis process based on Wavelet classification is used in the reconstruction

  15. Self-Organizing Fault-Tolerant Topology Control in Large-Scale Three-Dimensional

    E-Print Network [OSTI]

    Wang, Yu

    be deployed in three-dimensional (3D) space, such as under water wireless sensor networks in ocean or mobile to investigate self-organizing fault-tolerant topology control protocols for large- scale 3D wireless networks networks. Our simulation confirms our theoretical proofs for all proposed 3D topologies. Categories

  16. Chimera: Large-Scale Classification using Machine Learning, Rules, and Crowdsourcing

    E-Print Network [OSTI]

    Doan, AnHai

    Chimera: Large-Scale Classification using Machine Learning, Rules, and Crowdsourcing Chong Sun1 has been published on how this is done in practice. In this paper we describe Chimera, our solution solutions cease to work. We describe how Chimera employs a combination of learning, rules (created by in

  17. Large Scale Distribution of Stochastic Control Algorithms for Gas Storage Constantinos Makassikis, Stephane Vialle

    E-Print Network [OSTI]

    Vialle, Stéphane

    Large Scale Distribution of Stochastic Control Algorithms for Gas Storage Valuation Constantinos algorithm which is applied to gas storage valuation, and presents its experimental performances on two PC achieved in the field of gas storage valuation (see [2, 3] for example). As a result, many different price

  18. Critical Perspectives on Large-Scale Distributed Applications and Production Grids

    E-Print Network [OSTI]

    Weissman, Jon

    not progressed in phase. Progress in the next phase and generation of distributed applications will require that can seamlessly utilize distributed infrastructures in an extensible and scalable fashion. We believeCritical Perspectives on Large-Scale Distributed Applications and Production Grids Shantenu Jha1

  19. Challenges and Opportunities in Large-Scale Deployment of Automated Energy Consumption

    E-Print Network [OSTI]

    Mohsenian-Rad, Hamed

    to the locational marginal price (LMP) at that bus. We show that a key challenge in large- scale deployment of ECS, locational marginal price. I. INTRODUCTION Real-time and time-of-use electricity pricing models can- edge among users on how to respond to time-varying prices and the lack of effective home automation

  20. Large-Scale Patent Classification with Min-Max Modular Support Vector Machines

    E-Print Network [OSTI]

    Lu, Bao-Liang

    Large-Scale Patent Classification with Min-Max Modular Support Vector Machines Xiao-Lei Chu, Chao Ma, Jing Li, Bao-Liang Lu Senior Member, IEEE, Masao Utiyama, and Hitoshi Isahara Abstract-- Patent-world patent classification typically exceeds one million, and this number increases every year. An effective

  1. Comparative Analysis of Balanced Winnow and SVM in Large Scale Patent Categorization

    E-Print Network [OSTI]

    Steels, Luc

    Comparative Analysis of Balanced Winnow and SVM in Large Scale Patent Categorization Katrien Beuls techniques, a collection of 1.2 million patent applications is used to build a classifier that is able). Contrary to SVM, Balanced Winnow is frequently applied in today's patent categorization systems. Results

  2. ON THE ROLE OF THE LARGE-SCALE MAGNETIC RECONNECTION IN THE CORONAL HEATING

    E-Print Network [OSTI]

    Pevtsov, Alexei A.

    emerging active region. We demonstrate that the effects of remote heating can be seen at significantON THE ROLE OF THE LARGE-SCALE MAGNETIC RECONNECTION IN THE CORONAL HEATING Alexei A. Pevtsov(1 changes in the magnetic connectivity, may play a role in coronal heating. To demonstrate the validity

  3. Time series modeling and large scale global solar radiation forecasting from geostationary satellites data

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    1 Time series modeling and large scale global solar radiation forecasting from geostationary global solar radiation. In this paper, we use geostationary satellites data to generate 2-D time series of solar radiation for the next hour. The results presented in this paper relate to a particular territory

  4. Crude closure dynamics through large scale statistical theories Marcus J. Grote and Andrew J. Majda

    E-Print Network [OSTI]

    Majda, Andrew J.

    Crude closure dynamics through large scale statistical theories Marcus J. Grote and Andrew J. Majda 10012-1185 Received 22 January 1997; accepted 9 July 1997 Crude closure algorithms based on equilibrium on equilibrium energy-enstrophy statistical theory, or two parameters, the energy and circulation, for crude

  5. Parallel Implementation of a Large-Scale 3-D Air Pollution Model

    E-Print Network [OSTI]

    Ostromsky, Tzvetan

    Parallel Implementation of a Large-Scale 3-D Air Pollution Model Tzvetan Ostromsky1 and Zahari-4000 Roskilde, Denmark, zz@dmu.dk; http://www.dmu.dk/AtmosphericEnvironment Abstract. Air pollution and analyzed. Keywords: air pollution model, system of PDE's, parallel algorithm, shared memory computer

  6. Introduction to a Large-Scale General Purpose Ground Truth Database: Methodology,

    E-Print Network [OSTI]

    Zhu, Song Chun

    is to build up a publicly accessible annotated image database with over 1,000,000 of images and more than 200, to make the database general enough to be used for different evaluation tasks, we need to build up in a universal way. To the best of our knowledge, there has not been much previous work on building a large scale

  7. Distributed Sampling-Based Roadmap of Trees for Large-Scale Motion Planning

    E-Print Network [OSTI]

    Kavraki, Lydia E.

    Distributed Sampling-Based Roadmap of Trees for Large-Scale Motion Planning Erion Plaku and Lydia E of the Sampling-based Roadmap of Trees (SRT) algorithm using a decentralized master-client scheme. The distributed that similar speedups can be obtained with several hundred processors. Index Terms-- motion planning, roadmap

  8. Mining for Statistical Models of Availability in Large-Scale Distributed Systems

    E-Print Network [OSTI]

    Kondo, Derrick

    Mining for Statistical Models of Availability in Large-Scale Distributed Systems: An Empirical and Telecommunication Systems (MASCOTS 2009) B. Javadi (INRIA) Statistical Models of Availability MASCOTS 2009 1 / 34) Statistical Models of Availability MASCOTS 2009 2 / 34 #12;Introduction and Motivation P2P, Grid, Cloud

  9. Simulation-based optimization of communication protocols for large-scale wireless sensor networks1

    E-Print Network [OSTI]

    Maróti, Miklós

    1 Simulation-based optimization of communication protocols for large-scale wireless sensor networks--The design of reliable, dynamic, fault-tolerant services in wireless sensor networks is a big challenge everyday life more comfortable, e.g. Intelligent Spaces [3]. These sensor networks often use distributed

  10. Very Large Scale Open Wireless Sensor Network Testbed Clement Burin des Rosiers2

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    SensLAB Very Large Scale Open Wireless Sensor Network Testbed Cl´ement Burin des Rosiers2 wireless sensor network protocols and applications. SensLAB's main and most important goal is to offer examples to illustrate the use of the SensLAB testbed. Key words: Wireless Sensor Network, Testbed, Radio

  11. SensLAB: a Very Large Scale Open Wireless Sensor Network Testbed

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    SensLAB: a Very Large Scale Open Wireless Sensor Network Testbed C. Burin des Rosiers2 , G. Chelius- tations of scalable wireless sensor network protocols and applications. SensLAB's main and most important demonstration examples to illustrate the use of the SensLAB testbed. Keywords: Wireless Sensor Network, Testbed

  12. Rationale Support for Maintenance of Large Scale Systems Janet E. Burge and David C. Brown

    E-Print Network [OSTI]

    Brown, David C.

    of developing the software in the first place [19]. One reason for this is that the software lifecycle is a long and expensive phases of the software life-cycle. Maintenance is especially difficult for large-scale systems maintenance, we are developing the SEURAT (Software Engineering Using RATionale) system to support

  13. LARGE SCALE DIRECT SHEAR TESTING WITH TIRE BALES By: Christopher J. LaRocque1

    E-Print Network [OSTI]

    Zornberg, Jorge G.

    2 , Advisor Abstract: There are growing environmental interests in the utilization of recycled tireLARGE SCALE DIRECT SHEAR TESTING WITH TIRE BALES By: Christopher J. LaRocque1 and Jorge G. Zornberg bales for civil engineering applications. Due to their lightweight and free-draining properties, tire

  14. Analysis and Management of Heterogeneous User Mobility in Large-scale Downlink Systems

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Analysis and Management of Heterogeneous User Mobility in Large-scale Downlink Systems Axel M¨uller§, Emil Bj¨ornson§, Romain Couillet, and M´erouane Debbah§ Intel Mobile Communications, Sophia Antipolis, France ACCESS Linnaeus Centre, Signal Processing Lab, KTH Royal Institute of Technology, Sweden

  15. Development and Deployment of a Large-Scale Flower Recognition Mobile App

    E-Print Network [OSTI]

    engine and re- lies on computer vision recognition technology. The mobile phone app is available freeDevelopment and Deployment of a Large-Scale Flower Recognition Mobile App Anelia Angelova NEC Labs- eration of user generated content, especially from mobile de- vices, there is a need to develop

  16. Performance of Hybrid Methods for Large-Scale Unconstrained Optimization as Applied

    E-Print Network [OSTI]

    Navon, Michael

    Performance of Hybrid Methods for Large-Scale Unconstrained Optimization as Applied to Models. It is shown that for the optimal parameters the hybrid approach is typically two times more efficient in terms­1231, 2003 Key words: energy minimization; proteins; loops; hybrid method; truncated Newton; dielectric

  17. A LARGE SCALE CONTINUUM-DISCRETE NUMERICAL MODELLING: APPLICATION TO OVERBURDEN DAMAGE OF A SALT CAVERN

    E-Print Network [OSTI]

    Boyer, Edmond

    A LARGE SCALE CONTINUUM-DISCRETE NUMERICAL MODELLING: APPLICATION TO OVERBURDEN DAMAGE OF A SALT damage on top of an underground solution mining, an in-situ experiment is undertaken above a salt cavity in the Lorraine region (NE of France). The overburden overlying the salt cavity is characterized by a competent

  18. CrowdSC: Building Smart Cities with Large Scale Citizen Participation

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    CrowdSC: Building Smart Cities with Large Scale Citizen Participation Karim Benouaret1 , Raman/Inria/Universit´e de Lorraine, Villers-l`es-Nancy, France Abstract ­ An elegant way to make cities smarter would CrowdSC, an effective crowdsourcing frame- work designed for smarter cities. We show that it is possible

  19. Passive Network Performance Estimation for Large-Scale, Data-Intensive Computing

    E-Print Network [OSTI]

    Weissman, Jon

    --Distributed computing applications are increasingly utilizing distributed data sources. However, the unpredictable cost- intensive scientific workflows [3], [4]. For such data- intensive tasks, data access cost is a significant to consider data access cost in launching data-intensive computing applications. Large-scale computing

  20. THE PREV AIR SYSTEM, AN OPERATIONAL SYSTEM FOR LARGE SCALE AIR QUALITY FORECASTS OVER EUROPE; APPLICATIONS

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    THE PREV AIR SYSTEM, AN OPERATIONAL SYSTEM FOR LARGE SCALE AIR QUALITY FORECASTS OVER EUROPE Author ABSTRACT Since Summer 2003, the PREV'AIR system has been delivering through the Internet1 daily air quality forecasts over Europe. This is the visible part of a wider collaborative project

  1. A Programming Model for Context-Aware Applications in Large-Scale Pervasive Systems

    E-Print Network [OSTI]

    Dustdar, Schahram

    .g. pervasive health-care, city traffic monitoring, environmental monitoring, smart grids). These large- scale, and smart grids. These systems differ significantly from conventional context-aware systems, which focus. Examples of such trends are pervasive health-care, city traffic scheduling, environmental monitoring

  2. Impacts of Shortwave Penetration Depth on Large-Scale Ocean Circulation and Heat Transport

    E-Print Network [OSTI]

    Gnanadesikan, Anand

    Impacts of Shortwave Penetration Depth on Large-Scale Ocean Circulation and Heat Transport COLM independent parameter- izations that use ocean color to estimate the penetration depth of shortwave radiation. This study offers a way to evaluate the changes in irradiance penetration depths in coupled ocean

  3. Onix: A Distributed Control Platform for Large-scale Production Networks Teemu Koponen

    E-Print Network [OSTI]

    Onix: A Distributed Control Platform for Large-scale Production Networks Teemu Koponen , Martin on top of which a network control plane can be implemented as a distributed system. Control planes written within Onix operate on a global view of the network, and use basic state distribution primitives

  4. Large-scale molecular dynamics simulation of magnetic properties of amorphous iron under pressure

    E-Print Network [OSTI]

    ) Enhanced refrigerant capacity and magnetic entropy flattening using a two-amorphous FeZrB(Cu) compositeLarge-scale molecular dynamics simulation of magnetic properties of amorphous iron under pressure Appl. Phys. Lett. 99, 232501 (2011) Nonlinear motion of magnetic vortex under alternating

  5. Energy, water and large-scale patterns of reptile and amphibian species richness in Europe

    E-Print Network [OSTI]

    Rodríguez, Miguel Ángel

    Energy, water and large-scale patterns of reptile and amphibian species richness in Europe Miguel Á and amphibian species richness in Europe and 11 environmental variables related to five hypotheses, an estimate of plant biomass generated through satellite remote sensing, both described similar proportions

  6. Large-scale hybrid poplar production economics: 1995 Alexandria, Minnesota establishment cost and management

    SciTech Connect (OSTI)

    Downing, M. [Oak Ridge National Lab., TN (United States); Langseth, D. [WesMinn Resource Conservation and Development District, Alexandria, MN (United States); Stoffel, R. [Minnesota Dept. of Natural Resources, Alexandria, MN (United States); Kroll, T. [Minnesota Dept. of Natural Resources, St. Paul, MN (United States). Forestry Div.

    1996-12-31T23:59:59.000Z

    The purpose of this project was to track and monitor costs of planting, maintaining, and monitoring large scale commercial plantings of hybrid poplar in Minnesota. These costs assists potential growers and purchasers of this resource to determine the ways in which supply and demand may be secured through developing markets.

  7. Modeling the large-scale water balance impact of different irrigation systems

    E-Print Network [OSTI]

    Evans, Jason

    Modeling the large-scale water balance impact of different irrigation systems J. P. Evans1 and B. F precipitation causes the Turkish government to invest in modernizing its own irrigation systems balance impact of different irrigation systems, Water Resour. Res., 44, W08448, doi:10.1029/2007WR006671

  8. Large-Scale Errors and Mesoscale Predictability in Pacific Northwest Snowstorms DALE R. DURRAN

    E-Print Network [OSTI]

    Large-Scale Errors and Mesoscale Predictability in Pacific Northwest Snowstorms DALE R. DURRAN The development of mesoscale numerical weather prediction (NWP) models over the last two decades has made- search communities. Nevertheless, the predictability of the mesoscale features captured in such forecasts

  9. Large-Scale Oceanographic Constraints on the Distribution of Melting and Freezing under Ice Shelves

    E-Print Network [OSTI]

    Gnanadesikan, Anand

    Large-Scale Oceanographic Constraints on the Distribution of Melting and Freezing under Ice Shelves received 10 October 2007, in final form 11 March 2008) ABSTRACT Previous studies suggest that ice shelves. Introduction Fifty percent of the Antarctic coastline is fringed by ice shelves (floating extensions

  10. Optimization and Large Scale Learning Optimization lies at the heart of almost every machine

    E-Print Network [OSTI]

    Optimization and Large Scale Learning Optimization lies at the heart of almost every machine these facets requires optimization techniques tailored to not only respect them but to ag- gressively exploit by looking at the recent book [1] (MIT Press, 2011), or at the follow- ing workshops: (i) "Optimization

  11. Categorised Ethical Guidelines for Large Scale Mobile HCI Donald McMillan

    E-Print Network [OSTI]

    Chalmers, Matthew

    University of Glasgow, UK matthew.chalmers@glasgow.ac.uk ABSTRACT The recent rise in large scale trials of community con- sensus can leave researchers unsure as to how to run a study which meets their ethical in Greenfield's Everyware book [18]. High-level guidelines such as `do no harm' and `default to harmlessness

  12. Design Considerations for a Large-Scale Wireless Sensor Network for Substation Monitoring

    E-Print Network [OSTI]

    Nasipuri, Asis

    effective monitoring applications for the substation using low-cost wireless sensor nodes that can sustainDesign Considerations for a Large-Scale Wireless Sensor Network for Substation Monitoring Asis University City Blvd. Charlotte, NC 28223 Luke Van der Zel and Bienvenido Rodriguez Substations Group EPRI

  13. Cloud Computing for Large-Scale Complex IT Systems The Proposers

    E-Print Network [OSTI]

    St Andrews, University of

    1 Cloud Computing for Large-Scale Complex IT Systems The Proposers This proposal aims to extend the consortium further as there are no obvious UK partners that would bring additional cloud computing expertise LSCITS consortium members Bristol and St Andrews, both of whom have LSCITS PhD students working in cloud

  14. Structure and dynamics of glass formers: Predictability at large length scales Ludovic Berthier*

    E-Print Network [OSTI]

    Berthier, Ludovic

    Structure and dynamics of glass formers: Predictability at large length scales Ludovic Berthier formers has been related to their static structure using the concept of dynamic propensity. We reexamine dynamical relaxation 2­11 , but their structure, as measured by two-point correlation functions, appears

  15. The impact of large scale biomass production on ozone air pollution in Joost B. Beltman a

    E-Print Network [OSTI]

    Utrecht, Universiteit

    The impact of large scale biomass production on ozone air pollution in Europe Joost B. Beltman by up to 25% and 40%. Air pollution mitigation strategies should consider land use management. a r t i Poplar a b s t r a c t Tropospheric ozone contributes to the removal of air pollutants from

  16. Advanced modeling of large-scale oxy-fuel combustion processes

    E-Print Network [OSTI]

    Yin, Chungen

    Advanced modeling of large-scale oxy-fuel combustion processes Chungen Yin Department of Energy Technology, Aalborg University, DK-9220 Aalborg, Denmark, chy@et.aau.dk Introduction Oxy-fuel combustion simulations of various oxy- fuel combustion processes and experimental validation. Result · A new weighted

  17. Does the Budget Surplus Justify Large-Scale Tax Cuts?: Updates and Extensions

    E-Print Network [OSTI]

    Sadoulet, Elisabeth

    Does the Budget Surplus Justify Large-Scale Tax Cuts?: Updates and Extensions Alan J. Auerbach agreed should not be used for tax cuts. All of the remaining "on-budget" surplus was due to implausible of the on-budget surplus was due to accumulations in government trust funds for medicare and pensions, which

  18. Smart Home in a Box: A Large Scale Smart Home Deployment

    E-Print Network [OSTI]

    Cook, Diane J.

    Smart Home in a Box: A Large Scale Smart Home Deployment Aaron S. CRANDALL a and Diane J. COOK a,1 systems. This work summa- rizes some of the existing works and introduces the Smart Home in a Box (SHiB) Project. The upcoming SHiB Project targets building 100 smart homes in several kinds of living spaces

  19. Invited Applications Paper Detecting Large-Scale System Problems by Mining Console Logs

    E-Print Network [OSTI]

    Xu, Wei

    . Researchers and operators have been using all kinds of mon- itoring data, from the simplest numerical metrics Problems by Mining Console Logs part operator, and charged with fixing the problem-- are usuallyInvited Applications Paper Detecting Large-Scale System Problems by Mining Console Logs Wei Xu xuw

  20. Platform-of-Platforms: A Modular, Integrated Resource Framework for Large-Scale Services

    E-Print Network [OSTI]

    Weissman, Jon

    Platform-of-Platforms: A Modular, Integrated Resource Framework for Large-Scale Services Rahul there has been a great deal of research ac- tivity in the development of diverse network service platforms-tier resource platform may be a natural fit for such multi-tier network services. Figure 1: Hierarchical