This evolution is attributed to the interactions between grains driven by the local plasticity.
Seasonal demand and price spikes for maize and other dry grains drive sales, and they are entering the market at an opportune time for a runway period in 2014 and a large scale up in 2015.
Grain motions driven by interstellar turbulence lead to grain disruption (shattering) in the diffuse ISM (Yan et al, 2004; Hirashita and Yan, 2009).
This dip feature would be smoothed out in reality since the grain velocity driven by turbulence has a dependence on grain charge, gas density, magnetic field, etc., all of which have a wide range within a galaxy.
A general approach to grain growth driven by energy density differences among the grains, associated with curvature and/or extraneous driving forces (e.g. external fields) is developed.
The results are not sensitive to vshat as long as the grain velocities driven by turbulence is much larger than the threshold, but are rather sensitive to the hardness of the grain materials as shown later.
The idea that normal grain growth driven by surface tension may be described theoretically by the hypothesis that the local velocity of an element of grain boundary is proportional to its local mean curvature dates back more than half a century.
Yu, W. S. & Demkowicz, M. J. Non-coherent Cu grain boundaries driven by continuous vacancy loading.
This conclusion highlights the importance of including the second derivative of the interface energy with respect to inclination γ′′ in the Herring relation in order to correctly describe the motion of grain boundaries driven by capillarity.
We use a mesoscopic simulation approach to study the coupling and competition between grain-boundary-curvature driven and grain-rotation-coalescence induced grain growth in a 〈001〉 textured columnar microstructure.
These effects enhance grain boundary cohesion and retard capillary driven grain coarsening, thereby qualifying boron-induced grain boundary engineering as an ideal strategy for the development of advanced HEAs.
