Le magmatisme de la région de Kwyjibo, Province\ud du Grenville (Canada) : intérêt pour les\ud minéralisations de type fer-oxydes associées

The granitic plutons located north of the Kwyjibo property in Quebec’s Grenville Province are of\ud Mesoproterozoic age and belong to the granitic Canatiche Complex . The rocks in these plutons are calc-alkalic, K-rich,\ud and meta- to peraluminous. They belong to the magnetite series and their trace element characteristics link them to\ud intraplate granites. They were emplaced in an anorogenic, subvolcanic environment, but they subsequently underwent\ud significant ductile deformation. The magnetite, copper, and fluorite showings on the Kwyjibo property are polyphased\ud and premetamorphic; their formation began with the emplacement of hydraulic, magnetite-bearing breccias, followed by\ud impregnations and veins of chalcopyrite, pyrite, and fluorite, and ended with a late phase of mineralization, during\ud which uraninite, rare earths, and hematite were emplaced along brittle structures. The plutons belong to two families:\ud biotite-amphibole granites and leucogranites. The biotite-amphibole granites are rich in iron and represent a potential\ud heat and metal source for the first, iron oxide phase of mineralization. The leucogranites show a primary enrichment in\ud REE (rare-earth elements), F, and U, carried mainly in Y-, U-, and REE-bearing niobotitanates. They are metamict and\ud underwent a postmagmatic alteration that remobilized the uranium and the rare earths. The leucogranites could also be\ud a source of rare earths and uranium for the latest mineralizing events

Instabilities and robust control in natural resource management

Most renewable natural resources exhibit marked demographic and environmental stochasticities, which are exarcebated in management decisions by the uncertainty regarding the choice of an appropriate model to describe system dynamics. Moreover, demand and supply analysis often indicates the presence of instabilities and multiple equilibria, which may lead to management problems that are intensified by uncertainty on the evolution of the resource stock. In this paper the fishery management problem is used as an example to explore the potential of robust optimal control, where the objective is to choose a harvesting rule that will work under a range of admissible specifications for the stock-recruitment equation. The paper derives robust harvesting rules leading to a unique equilibrium, which could be helpful in the design of policy instruments such as robust quota systems.info:eu-repo/semantics/publishedVersio

Yersinia pestis: the Natural History of Plague

International audienceThe Gram-negative bacterium Yersinia pestis is responsible for deadly plague, a zoonotic disease established in stable foci in the Americas, Africa, and Eurasia. Its persistence in the environment relies on the subtle balance between Y. pestis -contaminated soils, burrowing and nonburrowing mammals exhibiting variable degrees of plague susceptibility, and their associated fleas. Transmission from one host to another relies mainly on infected flea bites, inducing typical painful, enlarged lymph nodes referred to as buboes, followed by septicemic dissemination of the pathogen

Système de surveillance de la qualité de l’air basé sur des capteurs embarqués sur vélo : projet AIR’O X AIR BREIZH

Cette communication décrit la réalisation d’un projet étudiant (projet Air’o) destiné au suivi de la pollution de l’air en collaboration avec l’association Air Breizh. Ce projet a été initié pendant l’année universitaire 2019-2020 lors de la 2ème année ingénieur (niveau M1) au sein du département « électronique et télécommunications » de l’INSA de Rennes. Le but du projet est de proposer une mesure de la qualité de l’air par l’intermédiaire de capteurs embarqués sur des vélos. Une transmission de la position du capteur ainsi que la mesure de pollution en temps réel via le réseau LoRaWAN (Long Range Wide-area Network) permet de localiser les niveaux de pollution tout au long du parcours du vélo. Ce suivi de la qualité de l’air s’effectue par la récupération des données (pollution, position) sur un serveur dédié. Une application spécifique est développée afin de situer géographiquement les niveaux de pollution enregistrés. La réalisation d’un prototype est présentée ainsi que la transmission des informations. Des premiers résultats indiquent la pertinence du concept développé