The self-diffusion coefficient for Lennard-Jones molecules has been determined by molecular dynamics for densities up to the critical one and for temperatures ranging from T = 1.3∈/k to T = 5.56∈/k. At low density, the results are in a good agreement with the theoretical predictions; at...

The Mori formalism is used to study generalized transport coefficients in two dimensions. All finite multilinear products of the single particle density and momentum density comprise the set of the variables in the calculation of the self-diffusion coefficient. A self-consistent equation, which...

The paper reports on new, accurate (±0.3%) measurements of the viscosity of binary and multicomponent mixtures involving the four saturated hydrocarbons: CH4, C2H6, C3H8 and C4H10. Measurements were restricted to atmospheric pressure and the temperature range 25–195°C.

A model for a Rayleigh particle suspended in a rarefied gas in internal equilibrium is constructed. It is shown that the macroscopic evolution of this system can be described by using nonlinear unilateral transfer flows which are gradients of particular scalar functions. These functions are...

The partition function for a nonideal gas in the gravitational field has been evaluated classically, assuming that the height of the system is rather small. The thermodynamic properties and the equation of state have been calculated for such a system and compared with the corresponding ones for...

The Hubbard identity is used to show the absence of magnetic phase transitions in Heisenberg spin systems in one and two dimensions, generalizing Mermin and Wagner's result in an alternative way as Thorpe has done.

An analysis of the excess free energy of solutions of isotopic isomers is given. It is demonstrated that consideration of the contribution of internal degrees of freedom is essential and in the case of solutions of C6H6C6D6 this term predominates.

Sullivan and Deutch recently showed how the Wertheim formula for the dielectric constant of a non-polar fluid can be obtained as the lowest order result in a systematic expansion. We compare the results of this procedure with the results obtained with the more usual analysis of deviations from...

The molecular crystal with a complex lattice is analysed for low as well as high exciton concentrations. It was shown that apart from normal exciton levels the same number of kinematical levels exist in the system. The kinematical levels are shifted with respect to the normal levels and...

A study of an Ising model on a variety of Cayley tree-like lattices with its boundary in a magnetic field is made. It is proved rigorously that such models exhibit phase transitions only in the limit of zero field. The spontaneous magnetization far from the boundary is shown to behave as (Tinc...