The kinetic equation for a density matrix, which describes the relaxation of the internal states of encountering particles dissolved in an inert medium, has been derived under the following assumptions: a) the random motion of reacting particles in a liquid is considered to be a classical...

An exact expression is obtained for the fifth frequency moment sum-rule of the density response function of a classical turbulent plasma in a stationary state. It is used to show that the recent result of Ichimaru and Tange for the dispersion relations of the collective modes of the system is...

A definition of a quasi-one-dimensional system as a generalized Cayley or Husimi tree with a nonzero surface to bulk ratio in the thermodynamic limit is given. Sufficient conditions for the existence of the thermodynamic limit of the free energy for such a system are derived and a thorough...

Superspace groups have been introduced to describe the symmetry of n-dimensional incommensurate crystal phases. The (n + d)-dimensional Euclidean space in which these groups act as space groups has a distinguished n-dimensional subspace called position space. This implies that superspace groups...

The object of this investigation was to study experimentally the depolarized integrated Rayleigh intensity induced by collision of optically isotropic molecules CF4, CH4, SF6 at densities up to 350 amagats. We have compared the results at low densities with the pair approximation dipole-induced...

The spectral density method is used to study the thermodynamic properties of an anisotropic antiferromagnetic Heisenberg linear chain in an external magnetic field. Insecond order approximation without the decoupling procedure for the two particle correlation function, we are able to obtain many...

The diffusion tensor for a Brownian particle in a periodic field of force is studied in the strong damping limit, in which the Smoluchowski equation is valid.

The motion of a brownian particle in shear flow is exactly solved in phase space by means of an operator formalism. The solution is obtained as a particular case of a general solution for analogous problems.

The long ranged Gaussian random Ising bond model and short ranged binary random Ising bond model are discussed by the method of the pair approximation of the cluster variation and by the method of the integral equation for the distribution function of the effective fields. For the long ranged...