The Experts below are selected from a list of 675 Experts worldwide ranked by ideXlab platform
I Lin - One of the best experts on this subject based on the ideXlab platform.
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wave particle dynamics of wave breaking in the self excited dust acoustic wave
Physical Review Letters, 2009Co-Authors: Leewen Teng, Meichu Chang, Yuping Tseng, I LinAbstract:The wave-particle Microdynamics in the breaking of the self-excited dust acoustic wave growing in a dusty plasma liquid is investigated through directly tracking dust micromotion. It is found that the nonlinear wave growth and steepening stop as the mean oscillating amplitude of dust displacement reaches about 1/k (k is the wave number), where the vertical neighboring dust trajectories start to crossover and the resonant wave heating with uncertain crest trapping onsets. The dephased dust oscillations cause the abrupt dropping and broadening of the wave crest after breaking, accompanied by the transition from the liquid phase with coherent dust oscillation to the gas phase with chaotic dust oscillation. Corkscrew-shaped phase-space distributions measured at the fixed phases of the wave oscillation cycle clearly indicate how dusts move in and constitute the evolving waveform through dust-wave interaction.
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lagrangian eulerian micromotion and wave heating in nonlinear self excited dust acoustic waves
Physical Review Letters, 2008Co-Authors: Chenting Liao, Leewen Teng, Chenyu Tsai, I LinAbstract:We investigate particle-wave Microdynamics in the large amplitude self-excited dust acoustic wave at the discrete level through direct visualization. The wave field induces dust oscillations which in turn sustain wave propagation. In the regular wave with increasing wave amplitude, dust-wave interaction with uncertain temporary crest trapping and dust-dust interaction lead to the transition from cyclic to disordered dust motion associated with the liquid to the gas transition, and anisotropic non-Gaussian heating. In the irregular wave, particle trough-trapping is also observed, and the heating is nearly Gaussian and less anisotropic.
Leewen Teng - One of the best experts on this subject based on the ideXlab platform.
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wave particle dynamics of wave breaking in the self excited dust acoustic wave
Physical Review Letters, 2009Co-Authors: Leewen Teng, Meichu Chang, Yuping Tseng, I LinAbstract:The wave-particle Microdynamics in the breaking of the self-excited dust acoustic wave growing in a dusty plasma liquid is investigated through directly tracking dust micromotion. It is found that the nonlinear wave growth and steepening stop as the mean oscillating amplitude of dust displacement reaches about 1/k (k is the wave number), where the vertical neighboring dust trajectories start to crossover and the resonant wave heating with uncertain crest trapping onsets. The dephased dust oscillations cause the abrupt dropping and broadening of the wave crest after breaking, accompanied by the transition from the liquid phase with coherent dust oscillation to the gas phase with chaotic dust oscillation. Corkscrew-shaped phase-space distributions measured at the fixed phases of the wave oscillation cycle clearly indicate how dusts move in and constitute the evolving waveform through dust-wave interaction.
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lagrangian eulerian micromotion and wave heating in nonlinear self excited dust acoustic waves
Physical Review Letters, 2008Co-Authors: Chenting Liao, Leewen Teng, Chenyu Tsai, I LinAbstract:We investigate particle-wave Microdynamics in the large amplitude self-excited dust acoustic wave at the discrete level through direct visualization. The wave field induces dust oscillations which in turn sustain wave propagation. In the regular wave with increasing wave amplitude, dust-wave interaction with uncertain temporary crest trapping and dust-dust interaction lead to the transition from cyclic to disordered dust motion associated with the liquid to the gas transition, and anisotropic non-Gaussian heating. In the irregular wave, particle trough-trapping is also observed, and the heating is nearly Gaussian and less anisotropic.
Kay Brandner - One of the best experts on this subject based on the ideXlab platform.
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thermodynamic geometry of microscopic heat engines
Physical Review Letters, 2020Co-Authors: Kay Brandner, Keiji SaitoAbstract:We develop a general framework to describe the thermodynamics of microscopic heat engines driven by arbitrary periodic temperature variations and modulations of a mechanical control parameter. Within the slow-driving regime, our approach leads to a universal trade-off relation between efficiency and power, which follows solely from geometric arguments and holds for any thermodynamically consistent Microdynamics. Focusing on Lindblad dynamics, we derive a second bound showing that coherence as a genuine quantum effect inevitably reduces the performance of slow engine cycles regardless of the driving amplitudes. To show how our theory can be applied in practice, we work out a specific example, which lies within the range of current solid-state technologies.
S Godefroy - One of the best experts on this subject based on the ideXlab platform.
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surface nuclear magnetic relaxation and dynamics of water and oil in macroporous media
Physical Review E, 2001Co-Authors: S Godefroy, Jeanpierre Korb, Marc Fleury, Robert G BryantAbstract:Proton nuclear spin-relaxation studies on water- or oil-saturated granular packings and limestone rocks allow estimating surface molecular dynamical parameters. Measurements were performed at various conditions of temperature, magnetic field strengths, and pore size. We show by low field NMR relaxation that changing the amount of surface paramagnetic impurities leads to striking different pore-size dependences of the relaxation times T1 and T2 of liquids in pores. These dependences are well supported by surface-limited or diffusion-limited relaxation models. Surface relaxivity parameters rho(1) and rho(2) are deduced from the pore-size dependence in the surface-limited regime. We evidence the frequency and temperature dependence of the surface relaxivity rho(1) by field cycling NMR relaxation and relevant theoretical models. The typical frequency dependence found allows an experimental separation of the surface and bulk Microdynamics in porous media. Several surface dynamical parameters, such as diffusion coefficients, activation energies, time of residence, and coefficient of surface affinity, were therefore determined. The methods presented here give a powerful analysis of the surface Microdynamics of confined liquids, which can be applied to the study of oil-bearing rocks.
Chenting Liao - One of the best experts on this subject based on the ideXlab platform.
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lagrangian eulerian micromotion and wave heating in nonlinear self excited dust acoustic waves
Physical Review Letters, 2008Co-Authors: Chenting Liao, Leewen Teng, Chenyu Tsai, I LinAbstract:We investigate particle-wave Microdynamics in the large amplitude self-excited dust acoustic wave at the discrete level through direct visualization. The wave field induces dust oscillations which in turn sustain wave propagation. In the regular wave with increasing wave amplitude, dust-wave interaction with uncertain temporary crest trapping and dust-dust interaction lead to the transition from cyclic to disordered dust motion associated with the liquid to the gas transition, and anisotropic non-Gaussian heating. In the irregular wave, particle trough-trapping is also observed, and the heating is nearly Gaussian and less anisotropic.