Diatom teratologies have intrigued scientists since the XIXth century, with respect to their causes and origins. These deformities, mainly observed in long-term cultures or under high levels of pollution, were poorly considered, until they were recently found to be potential indicators of toxic impairment of freshwaters. However, very little is kno...
International audience
This article presents a methodology to generate surfaces with planar lines of curvature from two or three curves and tailored for architectural design. Meshing with planar quadrilateral facets and optimal offset properties for the structural layout are guaranteed. The methodology relies on the invariance of circular meshes by spherical inversion an...
Cette contribution examine la génèse – morphologique et syntaxique – des marques initiales du Nom berbère : marques de genre, de nombre et surtout d’état (État Libre/État d’Annexion). Ce marquage initial du Nom est spécifique au berbère, contrairement aux marques finales qui ont toutes des correspondants afro-asiatiques.Elle passe en revue les diff...
The performance of sewer networks has important consequences from an environmental and social point of view. Poor functioning can result in flood risk and pollution at a large scale. Sediment deposits forming in sewer trunks might severely compromise the sewer line by affecting the flow field, reducing cross-sectional areas, and increasing roughnes...
The spread of invasive aquatic plants (i.e., aquatic weeds) requires a broader knowledge of the factors determining their settlement at the lake scale, in order to improve management practices and biomonitoring. Among hydrodynamic pressures, wave action might influence submerged vegetation distribution in shallow lakes and potentially engender modi...
International audience
Much has been said about islands but no global definition of this geographical phenomenon has so far been made available. A normative approach is consequently difficult to adopt. A database was put together involving 1,085 islands in the size range of 100km2 to 1,000,000km2. Each digitized file of the coastline is linked to the following informatio...
La plaine alluviale du fleuve Niger à Niamey connaît depuis 2010, des inondations récurrentes qui provoquent des dégâts socioéconomiques et environnementaux considérables. Des études antérieures ont montré le rôle des facteurs aggravants comme les fortes précipitations et la déforestation des versants. L'objectif de cette étude est de montrer le rô...
Much has been said about islands but no global definition of this geographical phenomenon has so far been made available. A normative approach is consequently difficult to adopt. A database was put together involving 1,085 islands in the size range of 100km2 to 1,000,000km2. Each digitized file of the coastline is linked to the following informatio...
