background preloader



Blog Archive » Solar-panel “trees” really are inferior (or: “In which hopelessly inept journalists reduce me to having to debunk a school science project”) This article is reproduced from here. For some reason it has been taken down from his blog… I have the intention of writing this very post on this blog, and I may well still do so, but for now here is someone else’s… Just to be clear, this is not a scam! It is, however, a really good example of really sloppy journalism. Solar breakthrough? Some poor 13-year-old kid is all over the news as having made a “solar breakthrough”. Usual suspects: This is his writeup: [AMNH] The Secret of the Fibonacci Sequence in Trees Essential summary: This is, I’m sad to say, clear nonsense. Broken Experiment Most importantly, by mistake he did not measure power outputs from the solar cells. The actual power delivered by a solar cell is not linearly related to the open-circuit voltage; actually, as a semiconductor, it has a horribly nonlinear relationship. [National Instruments] Photovoltaic Cell I-V Characterization Theory The kid is measuring VOC. [BP Solar] 3 series solar panels Polycrystalline (Data sheet) ? ?

La dataviz de la dataviz : une infographie... | EXPOVIZ Spécialement réalisée à l’occasion d’Expoviz par Karen et François de Wedodata, « La dataviz de la dataviz » est une infographie qui représente le processus de design d’informations et met à plat les grandes étapes de création d’une visualisation de données, depuis la collecte jusqu’au choix de la forme d’expression graphique. Intégrée dans le parcours d’exposition, cette infographie a été conçue pour répondre et s’adapter aux contraintes spécifiques imposées par le format et les dimensions des panneaux (100x150 cm). « Travailler sur un tel format est assez rare et influe grandement sur la conception de l’image. En effet, on n’est pas dans le cas d’une dataviz qui va être vue derrière son écran d’ordinateur, sa tablette ou son magazine, à quelques centimètres. Encadrée par une licence Creative Commons, cette infographie est librement téléchargeable (fichier PNG | fichier PDF) et réutilisable. Merci à Wedodata pour ce travail de grande qualité, tant sur le fond que sur la forme !

Observatoire Présidentielle 2007 :: Blogopole AccueilTendançologueµtendançologueBlogopoleExplicationsEtudesBlogRevue de presseContacts La Blogopole > explications > soumettez votre site... Cliquez sur l'image pour accéder à la blogopole : Mentions Légales | Running robots | Robotics A cheetah running in its natural environment is an elegant, fluid display of biomechanics. What if robots could run the same way, and be deployed for search and rescue operations in areas where conventional vehicles cannot go? According to University of Delaware assistant professor Ioannis Poulakakis, a large fraction of the Earth's surface remains inaccessible to conventional wheeled or tracked vehicles, while animals and humans traverse such terrain with ease and elegance. Poulakakis is the principal investigator of a three-year, $265,532 grant from the National Science Foundation (NSF) to develop a family of systematic control strategies that work together with the robot's natural dynamics to generate fast, reliable and efficient running motions. The project, funded under NSF's Division of Civil, Mechanical and Manufacturing Innovation (CMMI), will focus on the running motion of quadrupeds (four-legged robots) with elastic energy storage elements such as springs. EurekAlert

Agence Web Rennes ADDVISO, concepteur et accompagnateur de projets Web à Rennes : Addviso Digity – Small Business Technology Advisor: Strategy & Support Grocery Stores on Wheels - Neighborhoods The next wave of food trucks aren't whipping up Korean tacos for adventurous foodies or slinging ice cream to kids. Instead, they're delivering fresh meat and produce in an effort to improve public health in low-income communities. A few months ago, a Chicago non-profit launched Fresh Moves, a one-aisle grocery store on a bus that sells pineapples, mangoes, collard greens, onions and other fresh fruits and vegetables in West Side neighborhoods like Lawndale and Austin, where locals have minimal access to fresh produce. A 2006 study by consultant Mari Gallagher linked these food deserts – defined by the USDA as a census tract more than a mile from a grocery store – to increased diabetes and other diet-related maladies, as well as premature death. Four Chicago residents developed the concept after deciding that opening their own grocery store or waiting for big retailers would take too long. They asked the city to donate one of its fleet to serve as a farmer's market on wheels.