The Experts below are selected from a list of 255 Experts worldwide ranked by ideXlab platform
S.r. Connors - One of the best experts on this subject based on the ideXlab platform.
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Wind power in New England: modeling and analysis of nondispatchable renewable Energy technologies
IEEE Transactions on Power Systems, 1998Co-Authors: J.b. Cardell, S.r. ConnorsAbstract:Nondispatchable renewable Energy technologies have beneficial environmental, financial and planning characteristics, yet are not readily included in resource planning analysis for two main reasons: the lack of familiarity in the power sector with their behavior, and the lack of appropriate analysis tools. This paper presents a methodology, to be used in conjunction with a standard production-costing model, for analyzing nondispatchable renewable Energy technologies (RETs) as part of power systems operation. Our analysis of 1500 MW/sub p/ of wind power in New England shows that this capacity can capture the same amount of Energy as the region's utility sponsored DSM programs, and that the wind resource in New England is comparable, on an Energy Basis, to that in California.
J.b. Cardell - One of the best experts on this subject based on the ideXlab platform.
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Wind power in New England: modeling and analysis of nondispatchable renewable Energy technologies
IEEE Transactions on Power Systems, 1998Co-Authors: J.b. Cardell, S.r. ConnorsAbstract:Nondispatchable renewable Energy technologies have beneficial environmental, financial and planning characteristics, yet are not readily included in resource planning analysis for two main reasons: the lack of familiarity in the power sector with their behavior, and the lack of appropriate analysis tools. This paper presents a methodology, to be used in conjunction with a standard production-costing model, for analyzing nondispatchable renewable Energy technologies (RETs) as part of power systems operation. Our analysis of 1500 MW/sub p/ of wind power in New England shows that this capacity can capture the same amount of Energy as the region's utility sponsored DSM programs, and that the wind resource in New England is comparable, on an Energy Basis, to that in California.
L Friedland - One of the best experts on this subject based on the ideXlab platform.
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quantum phenomena in a chirped parametric anharmonic oscillator
Physical Review Letters, 2014Co-Authors: Ido Barth, L FriedlandAbstract:: Parametric ladder climbing and the quantum saturation of the threshold for the classical parametric autoresonance due to the zero point fluctuations at low temperatures are discussed. The probability for capture into the chirped parametric resonance is found by solving the Schrodinger equation in the Energy Basis and the associated resonant phase-space dynamics is illustrated via the Wigner distribution. The numerical threshold for capture into the resonance is compared with the classical and quantum theories in different parameter regimes.
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Two-photon ladder climbing and transition to autoresonance in a chirped oscillator
Physical Review A, 2013Co-Authors: Ido Barth, L FriedlandAbstract:The two-photon ladder climbing (successive two-photon Landau-Zener-type transitions) in a chirped quantum nonlinear oscillator and its classical limit (subharmonic autoresonance) are discussed. An isomorphism between the chirped quantum-mechanical one and two-photon resonances in the system is used in calculating the threshold for the phase-locking transition in both the classical and quantum limits. The theory is tested by solving the Schrodinger equation in the Energy Basis and illustrated via the Wigner function in phase space.
Spencer J. Sherwin - One of the best experts on this subject based on the ideXlab platform.
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Parallel performance of the coarse space linear vertex solver and low Energy Basis preconditioner for spectral/hp elements
Parallel Computing, 2009Co-Authors: Leopold Grinberg, Spencer J. Sherwin, Dmitry Pekurovsky, George Em KarniadakisAbstract:The big bottleneck in scaling PDE-based codes to petaflop computing is scalability of effective preconditioners. We have developed and implemented an effective and scalable low Energy Basis preconditioner (LEBP) for elliptic solvers, leading to computational savings of an order of magnitude with respect to other preconditioners. The efficiency of LEBP relies on the implementation of parallel matrix-vector multiplication required by coarse solver to handle the h-scaling. We provide details on optimization, parallel performance and implementation of the coarse grain solver and show scalability of LEBP on the IBM Blue Gene and the Cray XT3.
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Low-Energy Basis preconditioning for elliptic substructured solvers based on unstructured spectral/ hp element discretization
Journal of Computational Physics, 2001Co-Authors: Spencer J. Sherwin, Mario A. CasarinAbstract:Abstract The development and application of three-dimensional unstructured hierarchical spectral/ hp element algorithms has highlighted the need for efficient preconditioning for elliptic solvers. Building on the work of Bica (Ph.D. thesis, Courant Institute, New York University, 1997) we have developed an efficient preconditioning strategy for substructured solvers based on a transformation of the expansion Basis to a low-Energy Basis. In this numerically derived Basis the strong coupling between expansion modes in the original Basis is reduced thus making it amenable to block diagonal preconditioning. The efficiency of the algorithm is maintained by developing the new Basis on a symmetric reference element and ignoring, in the preconditioning step, the role of the Jacobian of the mapping from the reference to the global element. By applying an additive Schwarz block preconditioner to the low-Energy Basis combined with a coarse space linear vertex solver we have observed reductions in execution time of up to three times for tetrahedral elements and 10 times for prismatic elements when compared to a standard diagonal preconditioner. Full details of the implementation and validation of the tetrahedral and prismatic element preconditioning strategy are set out below.
Mario A. Casarin - One of the best experts on this subject based on the ideXlab platform.
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Low-Energy Basis preconditioning for elliptic substructured solvers based on unstructured spectral/ hp element discretization
Journal of Computational Physics, 2001Co-Authors: Spencer J. Sherwin, Mario A. CasarinAbstract:Abstract The development and application of three-dimensional unstructured hierarchical spectral/ hp element algorithms has highlighted the need for efficient preconditioning for elliptic solvers. Building on the work of Bica (Ph.D. thesis, Courant Institute, New York University, 1997) we have developed an efficient preconditioning strategy for substructured solvers based on a transformation of the expansion Basis to a low-Energy Basis. In this numerically derived Basis the strong coupling between expansion modes in the original Basis is reduced thus making it amenable to block diagonal preconditioning. The efficiency of the algorithm is maintained by developing the new Basis on a symmetric reference element and ignoring, in the preconditioning step, the role of the Jacobian of the mapping from the reference to the global element. By applying an additive Schwarz block preconditioner to the low-Energy Basis combined with a coarse space linear vertex solver we have observed reductions in execution time of up to three times for tetrahedral elements and 10 times for prismatic elements when compared to a standard diagonal preconditioner. Full details of the implementation and validation of the tetrahedral and prismatic element preconditioning strategy are set out below.