The low density form of the generalized frequency (s) and wavevector (k) dependent self-diffusion coefficient D(k, s) is calculated, from which the low density forms of related quantities, e.g. the velocity autocorrelation function, are derived. Agreement is obtained with the low density kinetic...

The particle flux of binary gas mixtures in a bundle of cylindrical capillaries has been measured for the case that there is no gradient in the total pressure and the temperature.

A renormalization group transformation is introduced with the help of which critical properties of infinite systems can be related to finite systems. As a numerical example the method is applied to the two-dimensional Ising model. The critical point and critical point exponent are computed in...

A phenomenological theory of diffusion is given along the lines of the treatment of De Groot and Mazur1). Simple relations between the diffusion matrices of the various kinds of composition variables are established. In linear approximation all kinds of composition variables obey Fick's second...

The relation between quasi-averages and averages in the case of spontaneous breakdown of translational symmetry is analysed. A hybrid system with virtual breakdown and restoration of translational symmetry is examined. The definitions of phase probabilities and phase transitions are given. The...

Working within the framework of the linearized Boltzmann equation for the conduction electrons the existing theoretical treatments of acoustic attenuation in metals in the collision regime are extended to include realistic descriptions of electron-lattice scattering. In particular a variational...

The theory of average local velocity fields developed in the preceding article is applied to a suspension of spherically symmetric polymers. Three transport properties of the suspension are analyzed, namely the concentration dependence of the translational and rotational friction coefficient of...

The general formulation of quantum field theory as a problem in functional analysis, originally introduced by Schwinger, is shown to contain several problems in amorphous and disordered materials. These problems are simpler than elementary particle problems and have no divergence difficulties....

We present a detailed analysis of the kinetic behaviour of a one-dimensional Rayleigh model, consisting of one hard point interacting with otherwise freely moving points. We generalized the previous work of Jepsen and others by taking into account initial correlations between the particles; we...

A new chain diagram formula is derived for many-body systems in such a way that an ideal gas term does not explicitly appear. This form is simpler and more convenient than the previously known expression. The result is applied to a charged boson gas under different conditions. It is found that...