The most accurate value of the fitth virial coefficient B5 for a system of hard disks has been (0.3338±0.0005) B42 until now, where B2 is the second virial coefficient. The present work describes methods of calculation and gives the improved value B5 = 0.3335561 B42, the last digit being uncertain.

The perturbation approach to the theory of fluids, originally introduced by Zwanzig, is applied to the square-well plus Sutherland (∞, 6) fluid. It is shown that the virial coefficients up to the fourth are in close agreement with those for the LJ (12-6) with a hard-sphere cutoff when the bowl...

A rigorous derivation of a quantum kinetic equation for dilute homogeneous diatomic gases with noncentral interactions is presented. This equation generalizes the Waldmann-Snyder equation, describing the relaxation of both diagonal and nondiagonal terms of the quantum distribution function...

A generalization of Ferrell's continuum approximation for the transfer matrix is utilized to obtain a physically transparent calculation of the specific heat of a two-dimensional Ising model with a “layer”-type inhomogeneity in its exchange coupling, including small (quenched!) statistical...

The magnetic field effect on the viscosity has been measured for several polyatomic gases with the emphasis on symmetric top molecules with strong electric dipoles. Theoretical expressions are given for the field dependent viscosity coefficients for various types of angular momentum...

Quantum K-systems can usually be regarded as the systems which are conventional K-systems at ℏ = 0, i.e. they have the property of mixing trajectories in a phase space. The master kinetic equation without a priori random phase assumptions is derived in the quasiclassical approximation for the...

A comprehensive axiomatic system of the non-equilibrium thermodynamics of a surface of discontinuity is formulated. The general formulation of the axioms is applied to the problem of an n-component visco-elastic isotropic non-polar mixture. The effect of mass currents from one phase to the other...

Time dependence and spectral concentration in quantum systems are reviewed. A partitioning technique is presented based on retarded and advanced propagators. The associated fundamental time symmetry is conveniently formulated in correspondence with the classical notion of reversal of time and...

So far, permanent confinement of quarks is a purely phenomenological principle, not yet derived from quantum chromodynamics (QCD). A phenomenological model is exhibited that has confinement as well as the usual asymptotically-free short-distance behavior of QCD, and a crude approximation is made...

This paper is concerned with the Statistical Mechanics of an hydrogenic plasma with randomly fixed ions. Starting from the “physical” problem we introduce an “ideal” problem (with an enlarged state space); the latter is defined in such a way that its dynamical evolution leads to the...