In this paper, we first define the notion of viscosity solution for the following system of partial differential equations involving a subdifferential operator: $\cases \frac{\partial u}{\partial t}(t ...

Flow curves of polymer melts (the graph of viscosity versus shear rate in the log-log scale) have two distinct behaviors governed by Newtonian and Power law. The Newtonian behavior dominates at very ...

The earliest attempt in the industry to link different viscosity cups' outcomes and associate each with mathematical formulas based on core measurements was made by a sub-committee within ASTM ...