scholarly journals Reenvisioning velocity reversal as a diversity of hydraulic patch behaviours

2016 ◽  
Vol 30 (13) ◽  
pp. 2348-2365 ◽  
Author(s):  
Michael A. Strom ◽  
Gregory B. Pasternack ◽  
Joshua R. Wyrick
Keyword(s):  
Velocity Reversal

Convective Velocity Reversal Caused by Turbulence Transition in Tokamak Plasma

2013 ◽  
Vol 111 (26) ◽  
Author(s):  
W. L. Zhong ◽  
X. L. Zou ◽  
C. Bourdelle ◽  
S. D. Song ◽  
J. F. Artaud ◽  
...  
Keyword(s):  
Tokamak Plasma ◽  
Convective Velocity ◽  
Turbulence Transition ◽  
Velocity Reversal

A REVISED VELOCITY-REVERSAL AND SEDIMENT-SORTING MODEL FOR A HIGH-GRADIENT, POOL-RIFFLE STREAM

1996 ◽  
Vol 17 (2) ◽  
pp. 142-156 ◽  
Author(s):  
D. M. Thompson ◽  
E. E. Wohl ◽  
R. D. Jarrett
Keyword(s):  
High Gradient ◽  
Velocity Reversal ◽  
Sediment Sorting

Convection of a passive scalar by a quasi-uniform random straining field

1974 ◽  
Vol 64 (4) ◽  
pp. 737-762 ◽  
Author(s):  
Robert H. Kraichnan
Keyword(s):  
Velocity Field ◽  
Probability Distributions ◽  
Joint Probability ◽  
Passive Scalar ◽  
Joint Probability Distribution ◽  
Molecular Diffusivity ◽  
Velocity Reversal ◽  
Amplitude Profile ◽  
Line Elements ◽  
Rates Of Growth

The stretching of line elements, surface elements and wave vectors by a random, isotropic, solenoidal velocity field in D dimensions is studied. The rates of growth of line elements and (D – 1)-dimensional surface elements are found to be equal if the statistics are invariant to velocity reversal. The analysis is applied to convection of a sparse distribution of sheets of passive scalar in a random straining field whose correlation scale is large compared with the sheet size. This is Batchelor's (1959) κ−1 spectral regime. Some exact analytical solutions are found when the velocity field varies rapidly in time. These include the dissipation spectrum and a joint probability distribution that describes the simultaneous effect of Stretching and molecular diffusivity κ on the amplitude profile of a sheet. The latter leads to probability distributions of the scalar field and its space derivatives. For a growing κ−1 range at zero κ, these derivatives have essentially lognormal statistics. In the steady-state κ−1 regime at κ > 0, intermittencies measured by moment ratios are much smaller than for lognormal statistics, and they increase less rapidly with the order of the derivative than in the κ = 0 case. The κ > 0 distributions have singularities a t zero amplitude, due to a background of highly diffused sheets. The results do not depend strongly on D. But as D → ∞, temporal fluctuations in the stretching rates become negligible and Batchelor's (1959) constant-strain dissipation spectrum is recovered.

scholarly journals Ry Sgr: Pulsation Related Phenomenon

1985 ◽  
Vol 87 ◽  
pp. 211-215
Author(s):  
W.A. Lawson
Keyword(s):  
Radial Velocity ◽  
Absorption Line ◽  
Time Scale ◽  
Related Phenomenon ◽  
Velocity Analysis ◽  
Minimum Radius ◽  
Velocity Reversal ◽  
Line Splitting

The absorption line splitting reported by Cottrell and Lambert has been shown to be associated with the semi-regular pulsations. The event has a time scale of about 10 days (0.23 of a period) occuring about the radial velocity reversal at minimum radius. The velocity reversal is more rapid than indicated in an earlier radial velocity analysis by Alexander et al. There is evidence that the phase of the line splitting event is similar to the phase of the onset of the obscurational light declines.

scholarly journals Mesoscale pattern formation of self-propelled rods with velocity reversal

2016 ◽  
Vol 94 (5) ◽  
Author(s):  
Robert Großmann ◽  
Fernando Peruani ◽  
Markus Bär
Keyword(s):  
Pattern Formation ◽  
Velocity Reversal

scholarly journals Ensemble velocity of non-processive molecular motors with multiple chemical states

2014 ◽  
Vol 4 (6) ◽  
pp. 20140032 ◽  
Author(s):  
Andrej Vilfan
Keyword(s):  
Conformational Changes ◽  
Duty Cycle ◽  
Molecular Motors ◽  
Transition Rates ◽  
Functional Dependencies ◽  
Reverse Transition ◽  
Atp Concentration ◽  
Velocity Reversal ◽  
Chemical States ◽  
Multiple Chemical

We study the ensemble velocity of non-processive motor proteins, described with multiple chemical states. In particular, we discuss the velocity as a function of ATP concentration. Even a simple model which neglects the strain dependence of transition rates, reverse transition rates and nonlinearities in the elasticity can show interesting functional dependencies, which deviate significantly from the frequently assumed Michaelis–Menten form. We discuss how the order of events in the duty cycle can be inferred from the measured dependence. The model also predicts the possibility of velocity reversal at a certain ATP concentration if the duty cycle contains several conformational changes of opposite directionalities.

Long-wavelength statics solutions for the near surface with velocity reversal

2018 ◽  
Author(s):  
Zhiwen Xue ◽  
Jie Zhang ◽  
Mengyao Sun ◽  
Yihao Wang
Keyword(s):  
Near Surface ◽  
Long Wavelength ◽  
Velocity Reversal
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