For the development of next-generation GaN-based high electron mobility transistors, reliable software tools for DC and AC simulation are required. A hydrodynamic approach must be used, as the drift diffusion models fail to deliver accurate results for such structures. We propose two different hydrodynamic mobility models which account for the peculiarities of the GaN material system. The model...

In this paper we consider the effect of the direct ionizing stellar radiation field on the evolution of protoplanetary discs subject to photoevaporative winds. We suggest that models which combine viscous evolution with photoevaporation of the disc (e.g. Clarke, Gendrin & Sotomayor 2001) incorrectly neglect the direct field after the inner disc has drained, at late times in the evolution. We co...

Accurate description of nonlocal hot-carrier phenomena in modern semiconductor devices is becoming very important considering the rapid reduction of the feature size. Frequently used carrier transport models are the traditional drift-diffusion model and extended models which also consider the average carrier energy as an independent solution variable. While the drift-diffusion model is not capa...

Hydrodynamic gene delivery (HGD) is an established method of the last decade where macromolecules, non-normally permeable to cell membrane, are delivered intracellular. The basic principle is that a large volume of solution, containing genes or oligonucleotides, RNA, proteins or other compounds, is infused rapidly in circulation to permit the entrance of these substances to parenchymal cells. E...

Chapman-Enskog expansion is the orthodox approach to derive continuum flow models from Boltzmann’s kinetic equation for dilute gases. Beyond the Navier-Stokes-Fourier order, these models known as Burnett hydrodynamic-regime equations violate a number of fundamental mechanical and thermodynamic principles in their original forms. This has generated a widely investigated problem in the kinetic th...

Application of hydrodynamics for modeling of heavy-ion collisions is reviewed. We consider several physical observables that can be calculated in this approach and compare them to the experimental measurements.

We present two continuum models A and B to study the convective instability of granular materials subjected to vibrations. We carry out the linear stability analysis for model A and uncover the instability mechanism as a supercritical bifurcation of a bouncing solution. We also explicitly determine the onset of convection as a function of control parameters. The simulations results are in excel...