Mille milieux

Porphyrin ‘‘Mille-Feuilles” photo-electrodes

A porphyrin ‘‘Mille-Feuilles” photo-electrode is fabricated layer-by-layer by deposition of anionic [zinc meso-tetrakis(p-sulfonato phenyl) porphyrin] (ZnTPPS ) and positively charged polypeptides on a 11-mercaptoundecanoic acid-modified gold electrode to form a photoactive film. This work demonstrates that it is possible to form 3D structures having regularly spaced layers of redox molecules. ...

Mécanique des milieux continus Continuum Mechanics

We consider continuous media in which contact edge forces are present. Introducing the notion of quasibalanced contact force distribution, we are able to prove the conjectures made in [Noll, 1990] concerning the representation of contact edge forces. We first generalise the Noll theorem on Cauchy postulate. Then we adapt the celebrated Cauchy tetrahedron construction to find a representation th...

Contribution à l'étude des milieux poreux

Physique et Mécanique des Milieux Hétérogènes

In my thesis, I studied three problems involving E. Coli bacterial suspensions. Firstly, I focused on the Brownian motion of passive tracers in this particular active suspension close to a surface. Buoyancy and non-buoyancy swimming solutions were tested, revealing a linear increase of the passive tracer diffusion with the "active flux", obtained by the active concentration of bacteria multipli...

An early Australopithecus afarensis postcranium from Woranso-Mille, Ethiopia.

Only one partial skeleton that includes both forelimb and hindlimb elements has been reported for Australopithecus afarensis. The diminutive size of this specimen (A.L. 288-1 ["Lucy"]) has hampered our understanding of the paleobiology of this species absent the potential impact of allometry. Here we describe a large-bodied (i.e., well within the range of living Homo) specimen that, at 3.58 Ma,...