Emilie Ogez | Pérégrinations d'une fan du web MakingSociety | Resources for Open Source Hardware Entrepreneurs Brighter Planet's 350 Challenge La décomposition du mouvement Contexte historique La technique de la photographie offre aux scientifiques des possibilités nouvelles. A partir des années 1870, le Français Etienne-Jules Marey (1830-1904) et dans son sillage l’Américain Eadweard Muybridge (1830-1904) se servent d’instantanés photographiques pour décomposer le mouvement des êtres vivants. Analyse des images Marey, passionné par la locomotion humaine et animale, est l’inventeur en 1882 du fusil photographique et de la « chronophotographie », qui permettent de linéariser sur une même plaque le déplacement d’un sujet muni, pour les besoins de l’expérience, de plusieurs points réfléchissants sur les bras et les jambes. Interprétation Les travaux révolutionnaires de Marey et Muybridge ont eu immédiatement des applications.
Take Action! Guides | San Francisco Green Film Festival INSPIRED TO DO SOMETHING DIFFERENT Have you seen a festival film and started thinking “What can I do?” Then check out our ‘Take Action!’ guides: Find out how you can get involved and have an impact on some of the most pressing environmental issues. 4th SAN FRANCISCO GREEN FILM FESTIVAL THEMES This year the headline theme for the Festival is Water in the West. As we face the worst drought in years, we want to connect you with the ideas and organizations that will protect this precious resource. Download the Water in the West Take Action! Find our more about films on water at the Festival. From the hunt for bananas to the campaign to protect our oceans from commercial fishing, food security and reform is big this year. Download the Food Security Take Action! Find out more about films on food in the Festival. Filmmakers have brought us personal stories about what shapes the city around us, including visionary architecture and the tunnels beneath our cities. Do we know what our kids are eating?
#pdlt : Sciences sociales, les données ne feront pas tout « Inte Xavier de la Porte, producteur de l’émission Place de la Toile sur France Culture, réalise chaque semaine une intéressante lecture d’un article de l’actualité dans le cadre de son émission. Désormais, vous la retrouverez toutes les semaines aussi sur InternetActu.net. J’ai déjà parlé plusieurs fois de danah boyd (et internetActu aussi). C’est une ethnographe américaine spécialisée dans l’étude des réseaux sociaux, et notamment dans les usages que font les adolescents de ces réseaux sociaux. Elle mène un travail important sur ce sujet, qu’il est malheureux qu’on ne puisse pas lire en français. Mais le dernier post de son blog concerne une autre question, qui relève de la méthodologie, voire d’une forme d’épistémologie très contemporaine. danah boyd y interroge une notion dont on entend de plus en plus parler dans le monde du web, la notion de “Big data” (syntagme un peu difficile à traduire, ce serait peut-être “le grand répertoire des données” ou quelque chose comme ça) .
MIT Technology Review Simple Practical Ways to Live Eco-friendly. Sustainable - Natural - Re-Use - Chasing Green Radioisotopes in Industry | Industrial Uses of Radioisotopes (Updated March 2014) Modern industry uses radioisotopes in a variety of ways to improve productivity and, in some cases, to gain information that cannot be obtained in any other way.Sealed radioactive sources are used in industrial radiography, gauging applications and mineral analysis.Short-lived radioactive material is used in flow tracing and mixing measurements.Gamma sterilisation is used for medical supplies, some bulk commodities and, increasingly, for food preservation. Nuclear techniques are increasingly used in industry and environmental management. The continuous analysis and rapid response of nuclear techniques, many involving radioisotopes, mean that reliable flow and analytic data can be constantly available. This results in reduced costs with increased product quality. Neutron Techniques for Analysis Most commercial analysers use californium-252 neutron sources together with sodium iodide detectors and are mainly sensitive to TNC reactions. Gamma Radiography Gauging Wastes
Study traces ecological collapse over 6,000 years of Egyptian history Depictions of animals in ancient Egyptian artifacts have helped scientists assemble a detailed record of the large mammals that lived in the Nile Valley over the past 6,000 years. A new analysis of this record shows that species extinctions, probably caused by a drying climate and growing human population in the region, have made the ecosystem progressively less stable. The study, published September 8 in Proceedings of the National Academy of Sciences (PNAS), found that local extinctions of mammal species led to a steady decline in the stability of the animal communities in the Nile Valley. When there were many species in the community, the loss of any one species had relatively little impact on the functioning of the ecosystem, whereas it is now much more sensitive to perturbations, according to first author Justin Yeakel, who worked on the study as a graduate student at the University of California, Santa Cruz, and is now a postdoctoral fellow at the Santa Fe Institute.
Management 2.0 : Manage jan 28th, 2010 by Anthony Poncier This first one is related to a conference on Entreprise 2.0 (part of the General Management and Strategy Program) for an audience at HEC Executive Education (HEC is ranked first business school in Europe by the Financial Times). The objective of this article is to share the conference material. In the first part of the program, there was an intervention on Marketing 2.0, so I made only few slides on the subject, not to be redundant with another speaker. For those who follow this blog, the original post in French is here . D\'autres billets pour aller plus loin Management 2.0 : Which Role for the Middle Management ? Management 2.0 : gérer la participation dans les communautés d’entreprise Management 2.0 : Leadership and Collaboration Enterprise 2.0 : french touch
Techdirt. Solar One World wildlife populations halved in 40 years 29 September 2014Last updated at 17:29 ET By Roger Harrabin BBC environment analyst In Nepal, habitat loss and hunting have reduced tigers from 100,000 a century ago to just 3,000 The global loss of species is even worse than previously thought, the London Zoological Society (ZSL) says in its new Living Planet Index. The report suggests populations have halved in 40 years, as new methodology gives more alarming results than in a report two years ago. The report says populations of mammals, birds, reptiles, amphibians and fish have declined by an average of 52%. Populations of freshwater species have suffered an even worse fall of 76%. Severe impact Compiling a global average of species decline involves tricky statistics, often comparing disparate data sets. The Living Planet Index tracks more than 10,000 vertebrate species populations from 1970 to 2010 Then they estimated that wildlife was down "only" around 30%. 'New method' WWF is keen to avoid despair.
Great site on alternative energy by v_vox Feb 22