One of the most extraordinary phenomena which the system of the world offers to us is the movement of the planets and of their satellites in the same sense and very nearly in the same plane; if we picture to ourselves in fact all these stars describing from west to east some nearly circular orbits and very little inclined to the ecliptic, while the comets seem to be moved indifferently in every...

Light detection and ranging (lidar) is becoming an increasingly popular technology among scientists for the development of predictive models of forest biophysical variables. However, before this technology can be adopted with confidence for long-term monitoring applications in Canada, robust models must be developed that can be applied and validated over large and complex forested areas. This w...

To convert acoustic energy into estimates of fish density, the target strength (TS) of a representative fish must be known. TS is a measure of the acoustic reflectivity of a fish, which is variable depending on the presence of a swimbladder, the size of the fish, its behavior, morphology, and physiology. The most common method used to estimate the TS of a fish is a TS-to-length empirical regres...

Les codes correcteurs d'erreurs sont une des solutions permettant d'améliorer la qualité des communications numériques. Le principe du codage canal est d'introduire de la redondance dans la séquence d'information binaire afin de corriger les erreurs de transmission durant la réception de l’information. Deux grandes classes de codes correcteurs d’erreurs existent : les codes convolutifs et les c...

Le Théorème de Paley-Wiener de J. Arthur (cf. [A]) décrit la transformée de Fourier de l’espace des fonctions C∞ à support compact, K-finies à droite et à gauche, ou plutot τ -sphériques sur un groupe réductif réel dans la classe d’Harish-Chandra. La démonstration repose sur le déplacement de contour de certaines intégrales et sur l’étude des résidus ainsi obtenus. Plus récemment ce résultat a ...

After extending classical results on simple varieties of trees to trees counted by their number of leaves, we describe a filtration of the set of permutations based on their strong interval trees. For each subclass we provide asymptotic formulas for number of trees (by leaves), average number of nodes of fixed arity, average subtree size sum, and average number of internal nodes. The filtration...

Local loading conditions associated with shear banding formation in laboratory -@ten alloy specimens are examined. The specimens consist of compression specimens of large length to diameter ratio made of 91W-6Ni-3Co swaged tungsten alloys tested with the Hopkinson pressure bar and symmetric Taylor techniques. Experimental and numerical results provide insights on the effect of the hydrostatic p...

We give explicit formulas for the number Un(N) of closed polygonal paths of length N (starting from the origin) whose steps are n roots of unity, as well as asymptotic expressions for these numbers when N → ∞. We also prove that the sequences (Un(N))N≥0 are P -recursive for each fixed n ≥ 1 and leave open the problem of determining the values of N for which the dual sequences (Un(N))n≥1 are P -...