¡¡¡ YAST in ciac.ca/magazine (en) !!!

cleaned:July 21st 2003
next YAST
cleaning up
will occur around
end of august 2003

next random target :
YOUR CHOICE !
:--->
add a Museum !
winner Museum
or 3rd YAST !

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Sachant depuis Euler que el = Slk/k!, on montrera facilement que l'espérance E(X) de la loi de Poisson de paramètre l est l lui-même, puis que E(X2) = l + l2, donc que la variance est aussi égale à l puisque V(X) = E(X2) - [E(X)]2. On peut aussi démontrer que : si X et Y sont régies par des lois de Poisson indépendantes de paramètres l1 et l2, alors leur somme suit une loi de Poisson de paramètre l1 + l2.

Comment dessiner la forme d'un circuit de refroidissement optimal ? La recette donnée par Adrian Bejan consiste à simplifier le problème en recherchant tout d'abord la forme optimale de la plus petite surface élémentaire [celle qui minimisera les points chauds], par rapport aux contraintes et objectifs, sachant que la distribution de la température varie suivant la forme choisie. Parmi plusieurs formes choisies, les calculs (volume, taux de génération de chaleur fixés) montrent que les proportions de la surface élémentaire répondant le mieux au problème sont celles présentées dans l'image au centre. Cette forme de rectangle minimise les zones chaudes (en rouge) et la résistance (proportionnelle au maxima de la différence de température). Le résultat est bien moins bon dans le cas d'une surface élémentaire carrée (image de gauche) ou d'une forme en rectangle aplati (image de droite). La forme élémentaire optimale étant trouvée, on relie plusieurs de ces surfaces élémentaires en un mini-réseau dont, là encore, les lois physiques conduisent à trouver la forme qui répartie le mieux le refroidissement à l'échelle considérée [minimisation des points chauds] sans altérer le résultat que l'on obtenait à l'échelle inférieure. De proche en proche, en remontant par ce procédé une à une les échelles on arrive à une forme globale optimale par rapport aux contraintes et objectifs désirés.

Le Vieux Néant* (Voix douce, mollassonne, voix falsifiée, envieuse, d'en bas, hypocrite, enrobée, terriblement dangereuse, voix commune) Quoi qu'a dit ? — Raffarin. Quoi qu'a fait ? — Raffarin. A quoi qu'a pense ? — A Raffarin Pourquoi qu'a dit Raffarin ? Pourquoi qu'a fait Raffarin ? Pourquoi qu'a pense à Raffarin ? — A'xiste bien. *de la France

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