The one-dimensional magnetic mixture of two kinds of magnetic ions (Ising spins) of S = 1 and12 in the finite magnetic field is exactly solved by using the distribution function method. The magnetization process and the distribution of the thermal averages of the spins, which are of great...

The best known value of the fifth virial coefficient for a hard-sphere fluid was until now: B5/tB42 = 0.110277 ± 0.000014, B2 being the second virial coefficient. In the present work, B5 is determined more accurately, the result being B5/tB42 = 0.110252±0.000001. Moreover, the values of B6 and...

Previous work on infinite one-dimensional systems of interacting particles is continued. In the case of two-body potentials φ(x) = φ(-x), whose Fourier transform ĝf(k) eicsts, it is shown that a necessary condition that the equidistant configuration has for a certain range of densities...

The density dependence of the proton magnetic shielding constant σ in methane and ethylene has been investigated experimentally using a high resolution spectrometer which operates with hydrostatic pressures between 0 and 2500 bar. At a constant temperature of 29.2°C a nonlinear dependence of...

The method of stochastic dynamics is used for the study of a discrete trimolecular chemical model with internal fluctuations. Several trajectories of the phase point are simulated for the bistable Schlögl model at small volumes. The influence due to the discontinuity of the process on the...

Numerical solutions are presented for the set of approximated kinetic equations previously obtained to describe the dynamical behaviour of the pseudospin correlation functions of the transverse Ising model in H-bonded ferroelectrics. Stability of the soft mode and spectral characteristics of the...

The Kadanoff lowerbound renormalization transformation when applied to the 2-dimensional q-state Potts model, is found to show a bifurcation phenomenon at q = 4, that might be considered as signalling the onset to the first-order transition. At the value of the free parameter where the...

Regularity apparent in the lepton-pair widths of the vector mesons, ϱ, ω, θ, J/ψ and Y, is discussed with emphasis on the historical development of the subject.

To calculate the stationary resistivity, the role of the coupling to a bath is pointed out. In the case of two kinds of interacting charged particles, the coupling to a bath is taken into account by relaxation terms in the equation of motion of the density operator so that the correct balance...

A stochastic model is introduced with a non-conserved order parameter of n real components coupled to the density of generators for the rotation of the order parameter. As microscopic background it is based on a lattice dynamic model with O(n) symmetry.