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In the framework of the theory of partially fluidized granular flows we study the formation of longitudinal structures observed experimentally by Forterre and Pouliquen in a flow down a rough inclined plane. We show that the formation of longitudinal structures is related to the positive feedback between the fluidization rate and the lateral stress (side pressure), which leads to a convective instability. Our theory explains main experimental features, such as appearance and amplification of the structure at some distance from the outlet and non-stationary behavior of the structures.
We present experimental observations and numerical simulations of nonequilibrium spatial structures in a trapped Bose-Einstein condensate subject to oscillatory perturbations. In experiment, first, there appear collective excitations, followed by qua
Granular materials react to shear stresses differently than do ordinary fluids. Rather than deforming uniformly, materials such as dry sand or cohesionless powders develop shear bands: narrow zones containing large relative particle motion leaving ad
The earlier-developed master equation approach and kinetic cluster methods are applied to study kinetics of L1_0 type orderings in alloys, including the formation of twinned structures characteristic of cubic-tetragonal-type phase transitions. A micr
Avalanche experiments on an erodible substrate are treated in the framework of ``partial fluidization model of dense granular flows. The model identifies a family of propagating soliton-like avalanches with shape and velocity controlled by the inclin
For vertical velocity field $v_{rm z} (r,z;R)$ of granular flow through an aperture of radius $R$, we propose a size scaling form $v_{rm z}(r,z;R)=v_{rm z} (0,0;R)f (r/R_{rm r}, z/R_{rm z})$ in the region above the aperture. The length scales $R_{rm