Nitrogen incorporation from red alder (Alnus rubra Bong.) into an Oregon upland mesic forest soil was studied by tracing the fate of 15N added as 15N-labeled alder leaf litter. The recovery of 15N in vegetation, litter, lightand heavy-fractions of the soil, the chloroform-labile (microbial biomass) pool, and the whole soil were investigated after a 21-month field incubation of the labeled litte...

– A nonlinear version of the KYLE [1985] model is studied. If linear structure might work for small orders, it would hardly be the case for large orders. No restriction is made neither on the form of equilibrium nor on the probability distribution of the ex-ante asset value. Equilibrium is characterized as a fixed point of an operator, which depends only on the distribution of the asset value; ...

Leibniz introduit l’expression « ⁰⁄₀ » en 1672 dans un écrit mathématique sur les séries numériques pour exprimer la somme des unités. Il s’agit très probablement d’une premières apparitions de cette expression l’histoire mathématiques. cependant l’abandonne aussitôt. Elle apparaît à nouveau le contexte du calcul différentiel au moment où celui-ci fait débat l’Académie royale sciences. Une ques...

Cavity tree and snag abundance data are highly variable and contain many zero observations. We predict cavity tree and snag abundance from variables that are readily available from forest cover maps or remotely sensed data using negative binomial (NB), zero-inflated NB, and zero-altered NB (ZANB) regression models as well as nearest neighbor (NN) imputation methods. The models were developed an...

l’homme est toujours sous le regard des 'autres', c’est sa condition permanente au cours de  son existence. pour montrer cette situation humaine, sartre, philosophe existentialiste et écrivain français le plus connu du xxe siècle, a choisit le théâtre duquel nous avons choisi deux pièces: huis clos et les mouches. dans ces pièces, chaque personnage tente de juger 'l’autre' en le comparant à lui...

For solving large sparse symmetric linear systems, arising from the discretization of elliptic problems, the preferred choice is the preconditioned conjugate gradient method. The convergence rate of this method mainly depends on the condition number of the preconditioner chosen. Using Fourier analysis the condition number estimate of common preconditioning techniques for two dimensional ellipti...