Magnetorheological fluid Schematic of a magnetorheological fluid solidifying and blocking a pipe in response to an external magnetic field. (Animated version available.) A magnetorheological fluid (MR fluid) is a type of smart fluid in a carrier fluid, usually a type of oil. When subjected to a magnetic field, the fluid greatly increases its apparent viscosity, to the point of becoming a viscoelastic solid. Importantly, the yield stress of the fluid when in its active ("on") state can be controlled very accurately by varying the magnetic field intensity. The upshot of this is that the fluid's ability to transmit force can be controlled with an electromagnet, which gives rise to its many possible control-based applications. MR fluid is different from a ferrofluid which has smaller particles. How it works[edit] When a magnetic field is applied, however, the microscopic particles (usually in the 0.1–10 µm range) align themselves along the lines of magnetic flux, see below. Material behavior[edit] Where = shear stress;
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HTML Slidy Copyright © 2005-2010 W3C ® (MIT, ERCIM, Keio), All Rights Reserved. For handouts, its often useful to include extra notes using a div element with class="handout" following each slide, as in: <div class="slide"> ... your slide content ... </div><div class="handout"> ... stuff that only appears in the handouts ... </div> Each presentation is a single XHTML file Each slide is enclosed in <div class="slide"> ... <? The head element should include the following link to the style sheet: The body element's content should start with the following markup: This adds the logos on the top left and right corners of the slide. You are of course welcome to create your own slide designs. Use the meta element with name="copyright" for use in the slide show footer: If you want a separate title page with the W3C blue style, the first slide should be as follows: The w3c-blue.css style sheet looks for the classes "slide" and "cover" on div and img elements using the CSS selector div.slide.cover 5m0s slide 1/20
PIQO : quand on peut faire simple… Des ordis moins énergivores (mais aussi efficaces) pour les institutions françaises. Libres. assemblés en France ? C’est le pari osé d’une association de Nevers, qui a besoin de sous pour démarrer. Nous avons voulu en savoir plus avant, peut-être, de mettre la main au portefeuille, et nous sommes allés interroger Émilien Court, l’un des responsables du projet PIQO. Bonjour, Émilien. Je vois qu’on a les mêmes références ! PIQO est un projet de synthèse. Je suis tombé dans l’informatique quand j’étais petit, j’en ai même fait mon métier à une époque. Il n’a pas été difficile de constituer une équipe de personnes issues d’horizons très divers : éducation, économie sociale et solidaire, environnement, industrie, design… Aujourd’hui, PIQO compte une quinzaine de membres, qui tous voient derrière l’ordinateur un projet de société. Pourquoi avoir créé une association et faire un crowdfunding ? La question de créer une entreprise ne s’est même pas posée, à vrai dire. Restons pragmatiques.