Results 21 to 30 of about 139,956 (216)

Acceleration time scale for the first-order Fermi acceleration in relativistic shock waves [PDF]

, 1996
The acceleration time scale for the process of first-order Fermi acceleration in relativistic shock waves with oblique magnetic field configurations is investigated by the method of Monte Carlo particle simulations.
Bednarz, J., Ostrowski, M.
core   +3 more sources

Performance Modelling and Optimisation of Multi-hop Networks [PDF]

, 2012
A major challenge in the design of large-scale networks is to predict and optimise the total time and energy consumption required to deliver a packet from a source node to a destination node.
Abdelrahman, Omer Hassan Omer, Abdelrahman, Omer Hassan Omer   +1 more
core   +1 more source

Weak-inertial flow between two rough surfaces [PDF]

, 2005
“Oseen–Poiseuille” equations are developed from an asymptotic formulation of the three-dimensional Navier–Stokes equations in order to study the influence of weak inertia on flows between rough surfaces.
Bergeon, Alain, Lo Jacono, David, Plouraboué, Franck   +2 more
core   +3 more sources

Geometrically-exact time-integration mesh-free schemes for advection-diffusion problems derived from optimal transportation theory and their connection with particle methods [PDF]

, 2017
We develop an Optimal Transportation Meshfree (OTM) particle method for advection-diffusion in which the concentration or density of the diffusive species is approximated by Dirac measures.
Arroyo, Benson, Bompadre, Bompadre, Brenier, Cavalli, Chen, Daneri, Evans, Jordan, Jordan, Jordan, Kane, Knott, Lew, Lew, Li, Lisini, Liu, Lucy, Marsden, Monaghan, Sulsky, Villani, Zhang   +24 more
core   +3 more sources

Order-of-magnitude speedup for steady states and traveling waves via Stokes preconditioning in Channelflow and Openpipeflow

, 2018
Steady states and traveling waves play a fundamental role in understanding hydrodynamic problems. Even when unstable, these states provide the bifurcation-theoretic explanation for the origin of the observed states. In turbulent wall-bounded shear flows,
A Alonso, A Alonso, A Alonso, A Bergeon, A Bergeon, A Bergeon, A Bergeon, A Bergeon, A Bergeon, AP Willis, AR Champneys, B Dale, B Eckhardt, C Beaume, C Beaume, C Beaume, C Beaume, C Beaume, C Beaume, C Huepe, C Huepe, C Nore, C Nore, CCT Pringle, CCT Pringle, CK Mamun, D Barkley, D Henry, D LoJacono, D LoJacono, D LoJacono, D LoJacono, D Viswanath, DA Knoll, E Chénier, E Meca, E Meca, F Feudel, F Feudel, F Feudel, F Feudel, F Marques, F Waleffe, F Waleffe, F Waleffe, F. MELLIBOVSKY, G Bardan, G Kawahara, G Kawahara, GLG Sleijpen, H Faisst, H Faisst, H Wedin, H. Vitoshkin, HA Vorst Van der, I Mercader, I Mercader, I Mercader, I Mercader, I Mercader, J Burke, J Sánchez, J Wang, JE Dennis Jr, JF Gibson, JF Gibson, JF Gibson, JF Torres, JF Torres, JF Torres, K Avila, K Bergemann, K Borońska, K Deguchi, L Shi, L Veen Van, LS Tuckerman, LS Tuckerman, LS Tuckerman, M Abid, M Avila, M Brynjell-Rahkola, M Chantry, M Nagata, M Nagata, MF Hilali, MH Gutknecht, O Batiste, O Batiste, O Daube, O Sánchez, P Assemat, P Assemat, P Coullet, P Cvitanovic, P Cvitanović, P Sonneveld, R Touihri, R Touihri, RE Lynch, RM Clever, RR Kerswell, S Fauve, S Xin, S Xin, S Xin, S Xin, TM Schneider, W Dridi, Y Duguet, Y Duguet, Y Pomeau, Y Saad   +112 more
core   +1 more source

A Unified Successive Pseudo-Convex Approximation Framework [PDF]

, 2016
In this paper, we propose a successive pseudo-convex approximation algorithm to efficiently compute stationary points for a large class of possibly nonconvex optimization problems.
Pesavento, Marius, Yang, Yang
core   +2 more sources

Study on the peak shaving operation of cascade hydropower stations based on the plant-wide optimal curve

International Journal of Electrical Power & Energy Systems
A large number of renewable energy sources (RESs), such as wind and photovoltaics (PV), have increased the importance of hydropower stations with regulating capacity in peak shaving operation.
Fengshuo Liu, Kui Huang, Xuanyu Shi, Longqing Zhao, Yangxin Yu, Xueshan Ai, Xiang Fu   +6 more
doaj   +1 more source

Vlasov-Poisson in 1D for initially cold systems: post-collapse Lagrangian perturbation theory [PDF]

, 2014
We study analytically the collapse of an initially smooth, cold, self-gravitating collisionless system in one dimension. The system is described as a central "S" shape in phase-space surrounded by a nearly stationary halo acting locally like a harmonic ...
Colombi, Stephane
core   +1 more source

Time-distance helioseismology: Sensitivity of f-mode travel times to flows

, 2007
Time-distance helioseismology has shown that f-mode travel times contain information about horizontal flows in the Sun. The purpose of this study is to provide a simple interpretation of these travel times.
A. C. Birch, Gizon L., J. Jackiewicz, L. Gizon, T. L. Duvall Jr.   +4 more
core   +1 more source

Comparing policy gradient and value function based reinforcement learning methods in simulated electrical power trade [PDF]

, 2012
In electrical power engineering, reinforcement learning algorithms can be used to model the strategies of electricity market participants. However, traditional value function based reinforcement learning algorithms suffer from convergence issues when ...
Burt, Graeme, Galloway, Stuart, Lincoln, Richard, Stephen, Bruce   +3 more
core   +1 more source