We study lanthanum mononitride LaN by first-principles calculations. The commonly reported rock-salt structure of $Fm\bar{3}m$ symmetry for rare-earth monopnictides is found dynamically unstable at zero temperature. Using density functional theory and evolutionary crystal prediction, we discover a new, stable with $P1$ 0 K. This $P1$-LaN exhibits spontaneous electric polarization. Our ab initio...

We analyze the asymptotic behavior of a non-Newtonian Stokes system, posed in Hele–Shaw cell, i.e. thin three-dimensional domain which is confined between two curved surfaces and contains cylindrical obstacle. The fluid assumed to be power-law type defined by exponent 1< p<?. By letting thickness tend zero we obtain generalized form Poiseuille law, limit velocity nonlinear function pressure gra...

Osmotically-driven membrane processes, including forward osmosis (FO) and pressure retarded osmosis (PRO), are emerging technologies that have come under renewed interest and subjected to numerous investigations in recent years. In FO, water is extracted from a feed solution utilizing the high osmotic pressure of a concentrated draw solution (DS) that flows on the opposite side of an FO membran...