We evaluate the hydrodynamic interaction tensors for two spheres of unequal size and for general mixed slip-stick boundary conditions. A method of reflections leads to a series expansion for the diffusion tensors in powers of the inverse distance l−1 between sphere centers and explicit results...

We consider Brownian motion of a heavy particle (mass M), under conditions where the particle itself displays quantum effects, either because T is smaller than characteristic frequencies, or because the thermal wave packet size, h̵√MT, is bigger than characteristic lengths. A direct space...

The problem of deriving the Fokker-Planck equation describing the time-evolution of a single-particle system under the influence of a “large system” is investigated. The projection operator formalism is used for this purpose. The general equation for the time-evolution and the equations for...

In a supersonic molecular beam apparatus the velocity dependence of the total cross section for scattering of argon and krypton beams by argon, krypton and xenon has been measured for relative velocities ranging from 0.55 to 4.30 km · s-1. For all these systems a number of glory extrema were...

The compressibility isotherms of methane are presented at temperatures from 0° up to 150°C and at densities up to 570 amagat, the maximum pressure being 2600 bar. Based on these isotherms thermodynamic properties as a function of density and temperature have been calculated.

Experimental data of the thermal diffusion factor for low density He-Ar mixtures are given. The measurement apparatus is a two-bulb operated at TH = 308 K and TC = 77.6 K, the mean temperature being T = 148 K. It is concluded that the extended law of corresponding states proposed by Kestin, Ro...

A new recursion method is proposed for the calculation of the thermodynamics of Ising-spin models with short range interaction. The method is exact in one dimensions, while for higher dimensions a truncation scheme is developed. The approach is tested in the two-dimensional Ising model. The...

The density dependence of J13C−H in 13CH4 has been accurately measured in a methane sample containing the natural amount of 13CH4. A linear increase of J13C−H with increasing density has been found. The total variation over a density interval from 0−575 amagat is 0.24 Hz.

La viscosité du krypton a été mesurée en utilisant un viscosimètre à tube capillaire et à volume constant, avec une précision de ±1,3%, à 50°C jusqu'à 6500 bar. La densité atteinte de 2,88 g/cm3 est voisine de celle de 3,04 correspondant à la transition gaz-solide. Les écarts...

Results are presented for an effective potential for the n-component linear σ-model and the Ginzburg-Landau model of superconductivity. Effects due to fluctuations in the order parameter are accounted for order-by-order in the temperature.