Results 41 to 50 of about 442,315 (312)
Theory of entropy production in quantum many-body systems
Physical Review B, 2016 We define the entropy operator as the negative of the logarithm of the density matrix, give a prescription for extracting its thermodynamically measurable part, and discuss its dynamics. For an isolated system we derive the first, second and third laws of thermodynamics.
Solano-Carrillo, E., Millis, A. J.
openaire +3 more sources
Entropy production in classical Yang-Mills theory from glasma initial conditions [PDF]
Physical Review D, 2013 We study the thermalization process in classical Yang-Mills (CYM) field theory starting from noisy glasma-like initial conditions by investigating the initial-value sensitivity of trajectories. Kunihiro et al. linked entropy generation to the Kolmogorov-Sinai entropy, which gives the entropy production rate in classical chaotic systems, calculated ...
Iida, Hideaki +5 more
openaire +2 more sources
Machines, 2022 In the present work, unsteady flow solved by the Reynolds time-averaged Navier–Stokes equation was investigated to determine the inflow distortion mechanism and the spatial distribution of hydraulic loss in a bidirectional axial flow pumping station ...
Jia Chen +4 more
doaj +1 more source
Quantum features of entropy production in driven-dissipative transitions
Physical Review Research, 2020 The physics of driven-dissipative transitions is currently a topic of great interest, particularly in quantum optical systems. These transitions occur in systems kept out of equilibrium and are therefore characterized by a finite entropy production rate.
Bruno O. Goes +2 more
doaj +1 more source
Energies, 2022 The vortex rope in the draft tube is considered as the major contributor to pressure pulsation at partial load (PL) conditions, which causes the hydro unit to operate unstably.
Zhumei Luo +4 more
doaj +1 more source
Covariant nonequilibrium thermodynamics from Ito-Langevin dynamics
Physical Review Research, 2022 Using the recently developed covariant Ito-Langevin dynamics, we develop a nonequilibrium thermodynamic theory for small systems coupled to multiplicative noises.
Mingnan Ding, Xiangjun Xing
doaj +1 more source
Journal of Marine Science and Engineering, 2023 The reactor coolant pump (RCP) is the only rotating equipment in the primary circuit system of a nuclear power plant and the “heart” of the nuclear reactor.
Qiang Fu +4 more
doaj +1 more source
Entropy Production in Phase Field Theories [PDF]
, 2019 Allen-Cahn (Ginzburg-Landau) dynamics for scalar fields with heat conduction is treated in rigid bodies using a non-equilibrium thermodynamic framework with weakly nonlocal internal variables. The entropy production and entropy flux is calculated with the classical method of irreversible thermodynamics by separating full divergences.
openaire +2 more sources
Scientific Production of Entropy and Information Theory in Brazilian Journals
Journal of Information Systems and Technology Management, 2012 This article aims at giving an overview of the scientific production about Entropy and Information Theory in national periodical publications in Qualis/CAPES. This article is a descriptive research and a bibliometric study with a quantitative approach.
Rocha, Irani +2 more
openaire +3 more sources
Study on performance and flow loss of reactor coolant pump with different laws of guide vane angle
Energy Science & Engineering, 2023 To study the influence of different laws of guide vane angle on the performance of reactor coolant pump (RCP), five models of RCP with different guide vane were designed, and the three‐dimensional numerical calculation was carried out.
Daoxing Ye +5 more
doaj +1 more source