1. Introduction PFG NMR experiment is in principle capable to provide important transport-structural parameters of system consisting of a liquid confined in a porous matrix such as surface-to-volume ratio and tortuosity. The apparent diffusion coefficient is easily obtained in the case of Gaussian shape of the diffusion propagator. Dependence of these values on the diffusion time in a short tim...

Theoretical and experimental studies of restricted diffusion have been conducted for decades using single pulsed field gradient (s-PFG) diffusion experiments. In homogenous samples, the diffusion-diffraction phenomenon arising from a single population of diffusing species has been observed experimentally and predicted theoretically. In this study, we introduce a composite bi-compartmental model...

The orientation of MRI-measured diffusion tensor in the myocardium has been directly correlated to the tissue fiber direction and widely characterized. However, the scalar anisotropy indexes have mostly been assumed to be uniform throughout the myocardial wall. The present study examines the fractional anisotropy (FA) as a function of transmural depth and circumferential and longitudinal locati...

The diffusion of Ne in Ag is investigated by bombarding Ag sheet with energetic Ne ions and observing the Ne release during constant temperature anneals; giving D=2.5 * 1.5 exp (-59.5 5 2.0 x 103 Cal/mole/ RT), for volume diffusion. The activation energy is not consistent with previous values found for other inert gases in Ag but agrees with the predictions of impurity diffusion theory for diff...

A kinetic theory for the diffusion–controlled growth of pearlite is presented, which accounts simultaneously for diffusion through the austenite and via the transformation front. The simplified method abandons the need for mechanical equilibrium at the phase junctions and yet is able to explain experimental data on the growth rate of pearlite. Furthermore, unlike previous analyses, the deduced ...

CONTENTS INTRODUCTION THE DID·ESR METHOD . .. . . . . . .. .. ...... . . ... .. .. .... . . .. . .. .. ..... . . 4 DID-ESR STUDIES ON MIXED MODEL MEMBRANES AND RELATED STUDIES . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Lateral Diffusion of Cholesterol and Lipid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Compariso...

Restrictions to diffusion result in the dispersion of the bulk diffusion coefficient. We derive the exact universal high-frequency behavior of the diffusion coefficient in terms of the surface-to-volume ratio of the restrictions. This frequency dependence can be applied to quantify structure of complex samples with NMR using oscillating field gradients and static-gradient CPMG. We also demonstr...