The micropolar model is a continuum-mechanical model suited to describe a collection of particles interacting via forces and couples. When applied to dense granular liquids that model must display some specific features because of the peculiarities of the frictional forces. We want here to...

The new concept of two momenta coupling is developed to treat the Coriolis coupling and the centrifugal one for two rotors because they are important. A new method of classical canonical transformations is applied for two rotors coupling. The classical theory of two rotors scattering is studied....

The one-particle distribution for the modulus of the velocity of a hard-disk fluid inside a small circular cavity is studied. Due to the geometry of the cavity, the total angular momentum L is conserved if the (elastic) particle–wall collisions are specular, leading to a new, special...