The structure of the time-dependent xx-correlation functions of the one-dimensional XY-model is investigated in some detail on the basis of an extension of the thermodynamic Wick theorem. The results amount to a generalization of a rigorous result for the autocorrelation function of the...

In a crossed atomic beam apparatus measurements on the glory structure in the total cross section for scattering of Ne and Ar by Ar, Kr and Xe have been performed for relative velocities ranging from 650 to 3700 m/s. By measuring the systems Ar-Kr and Kr-Ar over the aforementioned velocity range...

A generalization of the Kawasaki inequality for diffusion constants is obtained in the form of an inequality for master operators. The main presupposition is that the fundamental master operator is self-adjoint. The mathematical method is closely related to the Zwanzig projection technique.

A system interacting with a heat bath and radiation is considered. It is assumed that the steady state is exactly characterized by the principle of minimum entropy production. From this, the general form of the equations for the time rate of change of the probabilities of the states is derived...

A microscopic derivation presented of the generalization of the linearized Boltzmann equation with the Langevin fluctuation force, which has earlier been postulated by Bixon and Zwanzig and by Fox and Uhlenbeck in their kinematical discussions on the hydrodynamic fluctuations.

A mean field-theory originally presented by Brout is used to obtain the limit of (meta-) stability for a Lennard-Jones system. Certain aspects of the theory are discussed in relation to recent results for liquid-solid phase transitions.

For three simple one-dimensional disordered models: (a) the Ising chain with random magnetic moments in a transverse field, (b) the Ising chain with random coupling constants in a transverse field, and (c) the X-Y model with a special type of disorder, the asymptotic equivalence in the...

The modified Enskog theory (MET) of transport in dense gases can be used to predict the density dependence of transport coefficients provided the function y, which is a product of a dimensionless density and a pair correlation function, is known as a function of density. In this communication we...

A theory is proposed for the explanation of the structural modulation of the ground state of Na2CO3. The modulation phase is seen as a generalisation of the concept of (anti) ferroelectric and ferroelastic phases out of the centre of the Brillouinzone. The instability of the structure is caused...

In an earlier paper, an alignment of the rotational angular momenta of gas molecules produced by a gradient in the stream velocity has been shown to cause a measurable birefringence in the gas. The present paper reports an extension of these measurements to mixtures, specifically N2 and HD with...