Attack on the pentagon results in discovery of new mathematical tile | Science In the world of mathematical tiling, news doesn’t come bigger than this. In the world of bathroom tiling – I bet they’re interested too. If you can cover a flat surface using only identical copies of the same shape leaving neither gaps nor overlaps, then that shape is said to tile the plane. Every triangle can tile the plane. Things get interesting with pentagons. The hunt to find and classify the pentagons that can tile the plane has been a century-long mathematical quest, begun by the German mathematician Karl Reinhardt, who in 1918 discovered five types of pentagon that do tile the plane. (To clarify, he did not find five single pentagons. Most people assumed Reinhardt had the complete list until half a century later in 1968 when R. That same year an unlikely mathematical pioneer entered the fray: Marjorie Rice, a San Diego housewife in her 50s, who had read about James’ discovery in Scientific American. But then the hunt went cold. I blog here about maths.
Graphene supercapacitors created with ‘traditional paper making’ process, rivals lead-acid battery capacity Materials engineers at Monash University in Australia have devised a method of producing graphene supercapacitors that have the same energy density as the lead-acid battery under your car’s hood. Not only are these supercapacitors about 10 times more energy-dense than commercial devices, but the method of producing the graphene inside the supercapacitors seems to be novel as well. The engineers say they used a process that is similar to traditional paper making — and that it could easily and cost-effectively scaled up for commercial production of graphene, and graphene-based supercaps. Supercapacitors are essentially small batteries that can recharge and discharge almost instantly. While this results in a very high power density (lots of watts), their energy density is generally very low (watt-hours). Graphene, however, could change all that. That’s the theory, anyway. Capillary action sucks the graphene flakes together, creating a dense structure that’s similar to paper
A molecular link between the active compon... [Mol Pharm. 2006 Nov-Dec Scrollitelling : quel outil pour vos récits multimédias immersifs ? Un an après Snow Fall, les formats multimédias immersifs (parfois baptisés « scrollitelling ») se multiplient sur les sites de presse, et des outils commencent à apparaître pour épauler les journalistes. Plateformes wysiwyg, extensions WordPress, scripts open source à coder : voici un panorama des solutions disponibles à ce jour. ↑1 » Les plateformes en ligne Pas besoin de mettre les mains dans le code… ou si peu. Scrollkit C’est actuellement la plateforme gratuite la plus aboutie. La fonctionnalité la plus puissante de Scrollkit est son module Skrollr, qui gère les effets de parralaxe de façon plutôt intuitive (à condition de connaître un peu de CSS). La plateforme gère de façon imparfaite le responsive design pour l’affichage mobile, mais ce problème est réglable : le grand point fort de Scrollkit est en effet la possibilité d’exporter le projet en fichier HTML, et de le personnaliser à l’envie – sans aucune dépendance aux serveurs du service. Shorthand Creatavist Racontr Mais aussi… sStory
Unique Metallic Q-Glass Could Be New Class of Solids | Materials Science Q-glass, a new solid alloy that has been discovered in a rapidly cooled mixture of aluminum, iron and silicon, is neither a pure glass, a crystal, nor even a quasicrystal, according to a team of researchers from the National Institute of Standards and Technology (NIST) and Argonne National Laboratory. The round nodules are the q-glass, not crystalline but with a well-defined chemical composition (Leonid A. Bendersky / NIST) “Very weird. The material appears to have none of the extended ordering of atoms found in crystals, which would make it a glass, except that it has a very defined composition and grows outward from ‘seeds’ – things that glasses most assuredly do not do. The solids catalog used to be pretty straightforward. Glasses have neither symmetry. “For one thing, the q-glass seems to have a strict chemical composition Seen under a microscope, it’s clear that, like a crystal, the spherical q-glass regions grow outward from a seed during cooling and exclude atoms that don’t fit.
my heterochromia. for all you homos OverAPI.com | Collecting all the cheat sheets Samsung sees A4WP wireless charging as the future Source: Wired Wireless charging is becoming an increasingly popular feature in top of the line smartphones. The new Galaxy S4 comes with built in wireless charging, but Samsung doesn’t see the Qi technology (the current standard found in most wireless charging products) used in its new flagship handset as the long term solution. Last year Samsung Electronics and Qualcomm partnered up to form the Alliance for Wirless Power (A4WP), which has since been developing and promoting its new wireless charging specification called WiPower. Although the technology has been in development for a while, this week Samsung stated that it intends to make Qi-based charging obsolete when it releases products using its own WiPower compatible devices. There are some pretty significant differences between Qi and WiPower, both in terms of how they work and what they allow consumers to do with them. Wireless charging using magnetic resonance.
Lucid Dreaming Synopsis[edit] This book attempts to teach the skills that can help you to have lucid dreams — dreams in which one knows he or she is dreaming. For the skeptical, lucid dreams have been scientifically demonstrated to exist. The ability to lucid dream will open your mind to a world of infinite possibilities as you become adept at taking control of your dreams. We will start by explaining how lucid dreaming works biologically. Next, the book will prepare you for lucid dreaming by helping you to remember more of your dreams (dream recall). Contents[edit] Before each target there is an image with a subjective indication of how complete that target is: Means that there is little information or the information there may not be reliable. Means that there is some information, but it's not very detailed or extensive. Means that much of the information is there, but it needs to be touched up or organized. Means that the information is basically complete. Introduction[edit] Dream Recall[edit] Using[edit]