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Crossover from negative to positive shear rate dependence in granular friction
Crossove granular friction
2011/9/9
We conduct an experiment on the frictional properties of granular matter over a wide range of shear rate that covers both the quasistatic and the inertial regimes. We show that the friction coefficien...
On the stability of the shear-free condition
shear-free condition spherically symmetric anisotropic
2010/3/18
The evolution equation for the shear is reobtained for a spherically symmetric anisotropic, viscous dissipative fluid distribution, which allows us to investigate conditions for the stability of the s...
Non-Twist Field Line Mappings for Tokamaks with Reversed Magnetic Shear
Non-Twist Field Line Mappings Tokamaks Reversed Magnetic Shear
2010/10/27
The structure of magnetic field lines in a tokamak with reversed magnetic shear is investigated by means of analytically derived area-preserving non-twist Poincar´e maps. The basic configuration...