We present some considerations on time-oscillatory phenomena in hydrodynamical
models for semiconductors and study the existence of periodic solutions. For the one-dimensional,
viscous, isentropic model, written in Lagrangian mass coordinates, we state a first existence result
and give a sketch of…
Spatially explicit models consisting of reaction-diffusion partial differential equations are considered in order to model prey-predator interactions, since it is known that the role of spatial processes reveals of great interest in the study of the effects of habitat fragmentation on biodiversity…