scholarly journals Current relaxation time scales in toroidal plasmas

1987 ◽  
Author(s):  
D.R. Mikkelsen
Keyword(s):  
Relaxation Time ◽  
Time Scales ◽  
Toroidal Plasmas ◽  
Current Relaxation

scholarly journals The Stability of Mars’s Annular Polar Vortex

2017 ◽  
Vol 74 (5) ◽  
pp. 1533-1547 ◽  
Author(s):  
William J. M. Seviour ◽  
Darryn W. Waugh ◽  
Richard K. Scott
Keyword(s):  
Relaxation Time ◽  
Time Scales ◽  
Time Scale ◽  
Thermal Relaxation ◽  
Polar Vortex ◽  
Radiative Relaxation ◽  
Equilibrium Profile ◽  
Rotating Shallow Water ◽  
The Stability ◽  
Topographic Forcing

Abstract The Martian polar atmosphere is known to have a persistent local minimum in potential vorticity (PV) near the winter pole, with a region of high PV encircling it. This finding is surprising, since an isolated band of PV is barotropically unstable, a result going back to Rayleigh. Here the stability of a Mars-like annular vortex is investigated using numerical integrations of the rotating shallow-water equations. The mode of instability and its growth rate is shown to depend upon the latitude and width of the annulus. By introducing thermal relaxation toward an annular equilibrium profile with a time scale similar to that of the instability, a persistent annular vortex with similar characteristics as that observed in the Martian atmosphere can be simulated. This time scale, typically 0.5–2 sols, is similar to radiative relaxation time scales for Mars’s polar atmosphere. The persistence of an annular vortex is also shown to be robust to topographic forcing, as long as it is below a certain amplitude. It is therefore proposed that the persistence of this barotropically unstable annular vortex is permitted owing to the combination of short radiative relaxation time scales and relatively weak topographic forcing in the Martian polar atmosphere.

scholarly journals Thouless and relaxation time scales in many-body quantum systems

2019 ◽  
Vol 99 (17) ◽  
Author(s):  
Mauro Schiulaz ◽  
E. Jonathan Torres-Herrera ◽  
Lea F. Santos
Keyword(s):  
Relaxation Time ◽  
Time Scales ◽  
Quantum Systems ◽  
Many Body

scholarly journals Relaxation time scales in collective dynamics of liquid alkali metals

2004 ◽  
Vol 121 (15) ◽  
pp. 7341-7346 ◽  
Author(s):  
Anatolii V. Mokshin ◽  
Renat M. Yulmetyev ◽  
Peter Hänggi
Keyword(s):  
Relaxation Time ◽  
Time Scales ◽  
Alkali Metals ◽  
Collective Dynamics ◽  
Liquid Alkali Metals

scholarly journals PACMAN PERCOLATION AND THE GLASS TRANSITION

Fractals ◽  
2013 ◽  
Vol 21 (03n04) ◽  
pp. 1350021 ◽  
Author(s):  
RAFFAELE PASTORE ◽  
MASSIMO PICA CIAMARRA ◽  
ANTONIO CONIGLIO
Keyword(s):  
Monte Carlo ◽  
Relaxation Time ◽  
Glass Transition ◽  
Monte Carlo Simulations ◽  
Relaxation Process ◽  
Time Scales ◽  
Relaxation Processes ◽  
Percolation Transition ◽  
Glass Model ◽  
Different Time Scales

We investigate via Monte Carlo simulations the kinetically constrained Kob-Andersen lattice glass model showing that, contrary to current expectations, the relaxation process and the dynamical heterogeneities seems to be characterized by different time scales. Indeed, we found that the relaxation time is related to a reverse percolation transition, whereas the time of maximum heterogeneity is related to the spatial correlation between particles. This investigation leads to a geometrical interpretation of the relaxation processes and of the different observed time scales.

scholarly journals Spin-Current Relaxation Time in Spin-Polarized Heisenberg Paramagnets

2005 ◽  
Vol 138 (3-4) ◽  
pp. 841-846
Author(s):  
R. Ragan ◽  
K. Grunwald ◽  
B. Batell
Keyword(s):  
Relaxation Time ◽  
Spin Current ◽  
Spin Polarized ◽  
Current Relaxation
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