Insular assemblages of species are often considered unique because they are exposed to unpredictable patterns of colonization/extinction that depend on distance from other sources of colonists and on size of islands. An alternative explanation is that islands provide fundamentally different habitats of those of the mainland, regardless of any possible effect of size and isolation. These alterna...

Le volume des données géographiques devient de plus en plus important et leur utilisation étendue à différents domaines, d’où le besoin de fouiller dans ces données géographiques. Ces données informent sur la position (les coordonnées) et la forme (point, ligne ou surface) d’objets. Ainsi, l’utilisation des algorithmes de fouille de données devient plus complexe, surtout quand il s’agit d’élabo...

A significant challenge for clinical administrators at outpatient physical therapy clinics is patient non-attendance. In this paper, we report the results of an archival data study for 4478 physical therapy patients that include patient attendance history, age group, payment method, and proximity to clinic. Analysis of attendance history revealed that 9790 out of 54,678 scheduled appointments w...

We consider a uid queue receiving its input from the output of a Marko-vian queue with nite or innnite waiting room. The input rate of the uid queue is characterized by a Markov modulated rate process. We derive a new approach for the computation of the stationary buuer content. This approach leads to a numerically stable algorithm for which the precision of the result can be given in advance. ...

Karst rocky desertification is a geo-ecological problem in Southwest China because of nature and man-made factors, which restricts the development of local economic and social. Soil and water erosion is one of the most harmful form of rocky desertification, but the management methods still keep in the exploratory stage. Biological soil crust is the organic complexes of biotic components includi...

Let In be the (big) diagonal ideal of (C). Haiman proved that the q, t-Catalan number is the Hilbert series of the graded vector space Mn = ⊕ d1,d2 (Mn)d1,d2 spanned by a minimal set of generators for In. We give simple upper bounds on dim (Mn)d1,d2 in terms of partition numbers, and find all bi-degrees (d1, d2) such that dim (Mn)d1,d2 achieve the upper bounds. For such bi-degrees, we also find...