A simple model for a granular ratchet corresponding to a single grain bouncing off a vertically vibrating sawtooth-like base is studied. Depending on the vibration strength, the sawtooth roughness and the restitution coefficient, horizontal transport in both the preferred and unfavoured directions is observed. A phase diagram indicating the regions in parameter space where each of the three pos...

In this work, particle-wall interaction in viscoelastic fluids is experimentally studied. The effect of Stokes number, Weissenberg number and surface roughness on the rebound velocity of a colliding spherical particle on a wall is considered. Different steel spherical particles are released in viscoelastic solutions of different high-molecular-weight polymers in water with different concentrati...

The spds-spin-orbit-coupled tight-binding model and linearized Boltzmann transport theory is applied to calculate the electrical conductivity, the Seebeck coefficient, and the power factor of silicon nanowires (NWs) with diameters D<12nm. Using experimentally measured values for the lattice thermal conductivity we estimate the room temperature thermoelectric figure of merit to be ZT~1. Keywords...

In forming processes contact friction significantly influence metal flow, stress-strain state and process parameters. Furthermore, tribological conditions influence workpiece surface quality and its dimensional precision. This paper presents research results of the influence of contact friction coefficient on a workpiece surface quality in ring upsetting by flat plates. Workpiece surface roughn...