Jules DESCHÊNES, Les plateaux de la balance, Montréal, Leméac, 1979, 265 p. [ISBN 2-7609-6005-6].

Abstract

Ce document est protégé par la loi sur le droit d'auteur. L'utilisation des services d'Érudit (y compris la reproduction) est assujettie à sa politique d'utilisation que vous pouvez consulter en ligne.

Ultrasound scattering from silica fume clusters: in-line shear flow dynamics of hydrophilic or partially hydrophobic silica fume fillers in melts of non-polar polymeric systems

“…In random dilute dispersions, each uncorrelated particle, in the low frequency scattering regime, scatters the incident wave unaffected by the presence of the other particles. The directional ultrasonic scattering coefficient α m ( k, s) defined as the power scattered per unit solid angle for an incident plane wave of unit amplitude, in the Rayleigh scattering regime, then scales as the inverse of the scattering mean free path l [34,35],…”

“…On the other hand, soft structures are irreversibly deformed by external stresses and splits of individual particles and small clusters one by one until the cluster reaches a stable size (surface erosion process) [38,40]. One may thus consider the mean field approach proposed by Snabre et al [34,40], giving a scaling law similar to the phenomenological equation ( 13) with m = 1/2 for deformable aggregates and m = 1/3 for rigid clusters, in good agreement with experimental investigations [41,43] and computer simulations [42].…”