Methods of theoretical physics, classical mechanics and quantum mechanics are used to develop classical and quantum models of economies and to derive their equations of motion that describe economy evolution in time, namely, Lagrange and Schrödinger equations correspondingly. The book is...

In this paper the powder snow avalanche is considered as a two-phase flow (air and snow particles). The equations governing this flow are the fluid mechanics conservation laws. The mass and the momentum conservation are considered for each phase. The interaction between the two phases takes into...