University of Marne-la-Vallée

About: University of Marne-la-Vallée is a based out in . It is known for research contribution in the topics: Estimator & Context (language use). The organization has 831 authors who have published 1855 publications receiving 55316 citations.

Why is the detection of q-Gaussian behavior such a common occurrence?

Abstract: q -Gaussian behavior is often encountered in quite distinct settings. A possible explanation is here given with reference to experimental scenarios in which data are gathered using a set-up that performs a normalization preprocessing. We show that the ensuing normalized input, as recorded by the measurement device, will always be q -Gaussian distributed if the incoming data exhibit elliptical symmetry, a rather common feature. Moreover, we find that in these circumstances, the value of the associated parameter q can be deduced from the normalization technique that characterizes the device . Finally, one concludes from the above remarks that great care should be exercised when empirically detecting q -Gaussian behavior. As an example, Gaussian data (the most common situation) will appear, after normalization, in the guise of q -Gaussian records.

Natural hazards, vulnerability and structural resilience: tsunamis and industrial tanks

Abstract: The paper presents an integrated framework which deals with natural hazards (tsunamis), physical vulnerability modelling, risk of failure for industrial structures (metal structures) and structural...

II. Rheology of Weakly Flocculated Suspensions of Viscoelastic Particles

Abstract: Nous proposons un modele microrheologique pour estimer la viscosite de cisaillement des suspensions concentrees de particules viscoelastiques. Dans un premier temps, nous presentons un modele de Kelvin Voigt tournant afin de decrire la deformation et l'orientation stable d'une particule viscoelastique dans un ecoulement de cisaillement simple. Nous utilisons alors une loi de viscosite valable pour des suspensions concentrees de spheres dures en interaction purement hydrodynamique et nous relions la concentration maximale d'empilement a la composante du tenseur de deformation des particules dans la direction de l'ecoulement. Nous analysons ensuite le comportement rheologique des suspensions de globules rouges et nous montrons le role des proprietes viscoelastiques non lineaires de la membrane cellulaire. Dans une seconde partie, nous introduisons une floculation des particules viscoelastiques et deduisons une loi de viscosite prenant en compte les phenomenes de floculation et de deformation des particules dans le champ de cisaillement. La loi rheologique proposee decrit la rheologie des suspensions de globules rouges aggreges en presence de dextrane dans la mesure ou nous pouvons negliger les phenomenes de restructuration des aggregats sous l'action des contraintes hydrodynamiques.