Quasi-stationary state transportation of a hose with quadrotors

2015 ◽  
Vol 63 ◽  
pp. 187-194 ◽  
Author(s):  
Julián Estévez ◽  
Jose Manuel Lopez-Guede ◽  
Manuel Graña
Keyword(s):  
Stationary State ◽  
Quasi Stationary State

scholarly journals A New Interpretation of Vortex-Split Sudden Stratospheric Warmings in Terms of Equilibrium Statistical Mechanics

2017 ◽  
Vol 74 (12) ◽  
pp. 3915-3936 ◽  
Author(s):  
Yuki Yasuda ◽  
Freddy Bouchet ◽  
Antoine Venaille
Keyword(s):  
Statistical Mechanics ◽  
Equilibrium State ◽  
Stationary State ◽  
Large Scale ◽  
Saddle Points ◽  
Polar Vortex ◽  
Equilibrium Statistical Mechanics ◽  
Entropy Functional ◽  
Quasi Stationary State ◽  
Vortex Split

Abstract Vortex-split sudden stratospheric warmings (S-SSWs) are investigated by using the Japanese 55-year Reanalysis, a spherical barotropic quasigeostrophic (QG) model, and equilibrium statistical mechanics. The statistical mechanics theory predicts a large-scale steady state as the most probable outcome of turbulent stirring, and such a state can be computed without describing all the details of the dynamics. The theory is applied to a disk domain that is modeled on the polar cap north of 45°N in the stratosphere. The equilibrium state is obtained by computing the maximum of an entropy functional. In the range of parameters relevant to the winter stratosphere, this state is anticyclonic. By contrast, cyclonic states are quasi-stationary states corresponding to saddle points of the entropy functional. These results indicate that the mean state of the stratosphere associated with the polar vortex is not close to an equilibrium state but to a quasi-stationary state. The theoretical calculations are compared with the results of a quasi-static experiment in which a wavenumber-2 topographic amplitude is increased linearly and slowly with time. The results suggest that the S-SSW can be qualitatively interpreted as the transition from the cyclonic quasi-stationary state toward the anticyclonic equilibrium state. The polar vortex splits during the transition toward the equilibrium state.

Relaxation times for establishing quasi-stationary state populations in non-thermal plasmas

Physica B+C ◽  
1976 ◽  
Vol 84 (2) ◽  
pp. 267-274 ◽  
Author(s):  
M. Cacciatore ◽  
M. Capitelli ◽  
H.W. Drawin
Keyword(s):  
Stationary State ◽  
Relaxation Times ◽  
Thermal Plasmas ◽  
Quasi Stationary State

Rotating systems of gravitating bodies in the quasi-stationary state

Astrophysics ◽  
1972 ◽  
Vol 5 (4) ◽  
pp. 322-328
Author(s):  
T. A. Agekyan ◽  
I. M. Micheile
Keyword(s):  
Stationary State ◽  
Rotating Systems ◽  
Quasi Stationary State

Use of the QUasI-Stationary State Approximation to Determine the Migration of Mineral Alteration Zones at a Natural Analogue for the Disturbed Zone of a Cementitious Radioactive Waste Repository

1993 ◽  
Vol 333 ◽  
Author(s):  
A.V. Chambers
Keyword(s):  
Radioactive Waste ◽  
Stationary State ◽  
Radioactive Waste Disposal ◽  
Natural Analogue ◽  
Radioactive Waste Repository ◽  
Alteration Zones ◽  
State Approximation ◽  
Quasi Stationary State ◽  
Waste Repository ◽  
Mineral Alteration

ABSTRACTCalculation of the movement of chemical fronts over long timescales could be important in underpinning performance assessments for radioactive waste disposal. A quasi-stationary state model, MARQUISS (Mineral Alteration Reactions using the QUasI-Statίonary State approximation), has been developed to achieve this objective by avoiding many of the problems encountered using more conventional approaches to coupled chemistry and transport calculations. MARQUISS simulates advective, dispersive and diffusive transport through a one-dimensional porous medium coupled with the chemical kinetics of mineral precipitation and dissolution. A description of its development and verification for simple systems is provided, together with its application in a study of the migration of mineral alteration zones at a natural analogue for a cementitious radioactive waste repository located at Maqarin in northern Jordan.

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