Diffusion de neutrons : introduction

Transition de phase ferroélastique du phosphate de plomb. Etude par diffusion inélastique des neutrons

2014 An inelastic neutron scattering study of the ferroelastic phase transition in lead phosphate has revealed in the high temperature phase the existence of a zone boundary soft mode whose character is compatible with the structure change at the transition. The analysis of the observed spectral line shape shows that this soft mode is overdamped between Tc and Tc + 100 K. The quasiharmonic freq...

Introduction a l'etude de salmonella et des salmonelloses en Iran

Oceanic Double-diffusion: Introduction

Introduction to Diffusion Processes

In this section we describe a class of stochastic processes called the diffusion processes. These are continuous-time, continuous state-space processes and their sample paths are everywhere continuous but nowhere differentiable. Since diffusions are defined through stochastic differential equations, we give a brief introduction to stochastic differential equations (which include a discussion on...

Introduction to Diffusion MR

Developments in the last century have led to a better understanding of diffusion, the perpetual mixing of molecules caused by thermal motion. In this chapter, the basic principles governing the diffusion phenomenon and its measurement using magnetic resonance (MR) are reviewed. The concepts of the apparent diffusion coefficient and of the diffusion propagator as well as their MR measurements ar...