163 research outputs found

    Diagnostic des eaux de surface. Application du système modulaire gradué au Boiron de Morges

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    Les variations hydro-climatiques et anthropiques actuelles et prévues dans le futur interrogent sur l’évolution de l’état écologique des cours d’eau. Il est donc crucial de développer des outils prenant en compte les dimensions quantitatives et qualitatives des ressources en eau. C’est le cas du système modulaire gradué proposé par l’Office fédéral de l’environnement. Cet article présente un retour d’expérience sur la mise en oeuvre de ce système, appliqué au Boiron de Morges, et sur sa capacité à identifier la variabilité spatio-temporelle des enjeux écologiques

    Stripping #The Dress: the importance of contextual information on inter-individual differences in colour perception.

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    In 2015, a picture of a Dress (henceforth the Dress) triggered popular and scientific interest; some reported seeing the Dress in white and gold (W&G) and others in blue and black (B&B). We aimed to describe the phenomenon and investigate the role of contextualization. Few days after the Dress had appeared on the Internet, we projected it to 240 students on two large screens in the classroom. Participants reported seeing the Dress in B&B (48%), W&G (38%), or blue and brown (B&Br; 7%). Amongst numerous socio-demographic variables, we only observed that W&G viewers were most likely to have always seen the Dress as W&G. In the laboratory, we tested how much contextual information is necessary for the phenomenon to occur. Fifty-seven participants selected colours most precisely matching predominant colours of parts or the full Dress. We presented, in this order, small squares (a), vertical strips (b), and the full Dress (c). We found that (1) B&B, B&Br, and W&G viewers had selected colours differing in lightness and chroma levels for contextualized images only (b, c conditions) and hue for fully contextualized condition only (c) and (2) B&B viewers selected colours most closely matching displayed colours of the Dress. Thus, the Dress phenomenon emerges due to inter-individual differences in subjectively perceived lightness, chroma, and hue, at least when all aspects of the picture need to be integrated. Our results support the previous conclusions that contextual information is key to colour perception; it should be important to understand how this actually happens

    Pulse Exposure in Ecotoxicology

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    Mixture Effects in Ecotoxicology

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    Estimation de l'écotoxicité des substances retrouvées dans le Léman.

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