Reproduction of the invasive slipper limpet, Crepidula fornicata , in the Bay of Brest, France

The reproduction of Crepidula fornicata was studied in the Bay of Brest in order to characterise the first step of the reproductive cycle of this invasive species. The survey was carried out from 2000 to 2003 and different parameters were measured, namely, the percentage of the different sexual stages, the straight length of the shell and the percentage of brooding females using a survey of the embryonic development and the fecundity. The juvenile frequency increases generally from mid-June or mid-August, depending on the year. In 2001 and 2003, a first peak was observed as early as May, but it was followed by a rapid disappearance of the individuals. The sex-ratio female/male increased from 0.22 to 0.46 between 2001 and 2003. The sex change between intermediates and females took place mainly in summer and was well marked in 2001 and 2003. The survey of the embryonic development in the egg capsules brooded by the females provided an annual phenology of the laying and hatching processes. The laying period extends from February to September with three to four major periods of egg-laying per year and corresponding hatching periods about 1 month later. Each female lays two to four times per year on average. The first egg-laying concerned fewer females than subsequent ones, except in 2003, and exhibited a higher fecundity. The annual mean of the number of eggs for each stage was not significantly different, thus indicating no significant mortality rate during embryonic development. For the C. fornicata population in the Bay of Brest, several reproductive characteristics tend to highlight its invasive capacity: (1) a long reproductive period, (2) reproduction in a ‘multi-trials' process equivalent to a spreading out of the risks and (3) a relatively high fecundit

End-User-Development for Smart Homes: Relevance and Challenges

International audienceUbiquitous computing is now mature enough to unleash the potential of Smart Homes. The obstacle is no more about hardware concerns but lies in how inhabitants can build, configure and control their Smart Home. In this paper, we defend the idea that End-User-Development (EUD), which considers inhabitants as makers rather than mere consumers, is an effective approach for tackling this obstacle. We reflect on the lifecycle of devices and services to discuss challenges that EUD system will have to address in the Smart Home context: installation and maintenance, designation, control, development (including programming, testing, and reusing), and sharing

Analyse et créativité pour la conception d'interaction avec l'habitat intelligent

International audienceConcevoir des interactions pour des systèmes innovants implique une première étape dans laquelle se mêlent découverte du domaine et des contraintes, créativité et mise en situation des idées sélectionnées. Cette étape a pour objectif de s'engager avec plus de confiance dans le processus de conception. Nous exposons ici une partie de notre démarche sur de nouvelles interactions avec l'habitat intelligent. Nous avons cherché à répondre le plus efficacement à nos différents objectifs par l'association de pratiques complémentaires que nous présentons succinctement avec un retour d'expérience sur leur mise en application et leur enchaînement

End-User-Development for Smart Homes: Relevance and Challenges

International audienceUbiquitous computing is now mature enough to unleash the potential of Smart Homes. The obstacle is no more about hardware concerns but lies in how inhabitants can build, configure and control their Smart Home. In this paper, we defend the idea that End-User-Development (EUD), which considers inhabitants as makers rather than mere consumers, is an effective approach for tackling this obstacle. We reflect on the lifecycle of devices and services to discuss challenges that EUD system will have to address in the Smart Home context: installation and maintenance, designation, control, development (including programming, testing, and reusing), and sharing

Vernacular Architecture of the Himalayas

International audienc

Architecture vernaculaire en Himalaya

International audienc

Vernacular Architecture of the Himalayas

International audienc

Architecture vernaculaire en Himalaya

International audienc

Sur le dosage colorimétrique de la silice sous forme de complexe ß silicomolybdique

Le dosage de la silice sous forme de complexe ß silicomo-lybdique s’effectue dans de bonnes conditions en milieu eau-alcool éthylique à 20 % d’alcool.On suit le passage de la forme ß à la forme a du complexe au cours du chauffage du premier au bain-marie pendant 2 h.Les deux formes sont stables dans des conditions précisées en milieu alcool