How to make batteries out of paint This article was taken from the January 2013 issue of Wired magazine. Be the first to read Wired's articles in print before they're posted online, and get your hands on loads of additional content by subscribing online. Researchers at Rice University, Houston, have created a battery made of paint. "We've airbrushed it on to tiles, polymers, glass and steel," says grad student Neelam Singh. Assemble your paintbox Your paintable lithium-ion battery comprises five coats of paint, each representing a component of the battery: the lithium-titanium anode, two current-collectors made of a solvent, a cobalt cathode, and a polymer separator that holds the electrolyte. Layer the components The paints have to be applied in a certain order: the separator is in the centre, between the anode and cathode, and the two current collectors seal the sandwich. Seal them up tightly To seal the battery, you can use the aluminium foil found in coffee-sachet packaging.
Programación y otras historias...: Python: trabajando con un entorno gráfico (wxPython) import wx, os from wx.lib.wordwrap import wordwrap licenceText = "Este es una muestra del poder de python XD" wildcard = "Archivos de audio mp3 (*.mp3)|*.mp3|" \ "Documento de Word (*.doc)|*.doc|"\ "Todos los archivos(*.*)|* class MyFrame(wx.Frame): def __init__(self): wx.Frame. panel = wx.Panel(self,-1) b = wx.Button(panel,-1,"Hola Mundo!" self.Bind(wx.EVT_BUTTON,self.OnButton,b) b = wx.Button(panel,-1,"Abrir algun archivo",(20,50)) self.Bind(wx.EVT_BUTTON,self.OnButton2,b) def OnButton(self,evt): info = wx.AboutDialogInfo() info.Name = "Mi Ventana" info.Version = "1.0" info.Copyright = "(C) Copyright Miguel Pinia" info.Description = wordwrap("Este es la informacion sobre la aplicacion: " "esta aplicacion fue hecha en" " python ", 350, wx.ClientDC(self)) info.License = wordwrap(licenceText,500,wx.ClientDC(self)) info.Developers = ["Miguel Pinia","wxPython","Vypi la mascota"] wx.AboutBox(info) def OnButton2(self,evt): if dlg.ShowModal() == wx.ID_OK: dlg.Destroy if __name__=="__main__": app = wx.App() app.MainLoop()
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-New HOme Project « Leifur Thor’s WorldPress Station Imagine a home that provides a level of comfort and ease of living beyond what’s known. Now imagine this home uses less energy while providing that superior standard of living. In this century, wouldn’t we rather have a home that harvests energy quietly instead of using it? An enclosed space three average people with no special skills can assemble noise free, and with no special building tools in three weeks from start to finish. With over 10,000 variations for layout a home we can alter in a day without need of a contractor. A home that’s over 90% recyclable and stronger against the elements. When disaster strikes and emergency shelters are needed, weight, cost, and ability to stand up in the elements are the three considerations when relief organizations look to find shelter solutions for people in need. The New Home Project will address both these critical aspects and challenge the idea of shelter by offering a radical departure from traditional shelter construction. Like this:
A Less Thirsty Future Through Engineered Crops? An op-ed in the Wall Street Journal sees a bright future for crops engineered for drought tolerance, water use efficiency, and other useful traits. The author, R. Paul Thompson, criticizes our recent report, “High and Dry,” for expressing too little faith in the ability of science and technology to make good on its unmet promises about genetic engineering. The basic point of the article is that new technologies typically start slow, but get more effective and less expensive as they mature, so we should expect GE to get cheaper and more effective too. Corn plant in drought-cracked soil. New Improved Biotech? Clearly technologies can advance, and the author provides a few cases in point. Technologies may face challenges that ultimately do not find adequate solutions, for technical, social, or economic reasons. Thompson ignores the part of our report that examines why the technology faces significant challenges in addressing drought. And then there are the Errors
Hydropower from Reuse Reused: a small stepper motor as found in a printer 2 discarded CD-ROMs a foam tray some long stick (I used a piece of 20mm diameter PVC tube from demolition) a LED one or two tie-wraps a small piece of scrap paper Non-reused: The only non-reused part is the hot melt glue (I recommend the low temp type, especially when working with kids). Tools: scissors, screwdriver to disassemble the printer (not shown), cutting pliers or desoldering tools for (optional, not shown). With a bit of luck the LED can also be found in the discarded printer. With even more luck you can find some discarded electronics with a LED standing tall on a printed circuit board, with most of its legs still intact, instead of mounted flush on the board. This makes it easier to remove from the print (leave the legs as long as possible) and easier to connect to the stepper motor by simply inserting it in the plug. Now to start building, see the next step.
1.2. Instalando Python (Python para principiantes) Una vez que hayas instalado tu distribución GNU/Linux, ya tendrás Python instalado en tu sistema. Para comprobarlo, abres una terminal (presiona Alt + F4 y luego escribe en el campo de búsqueda gnome-terminal) y escribe python como se muestra a continuación: eugenia@cochito:~$ python Python 2.7.2+ (default, Oct 4 2011, 20:03:08) [GCC 4.6.1] on linux2 Type "help", "copyright", "credits" or "license" for more information. Lo que verás en pantalla, es el Shell interactivo de Python. eugenia@cochito:~$ python Python 2.7.2+ (default, Oct 4 2011, 20:03:08) [GCC 4.6.1] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> print "Hola Mundo!" Si en lugar del Shell interactivo, ves un mensaje de error similar a "python: orden no encontrada", deberás seguir los siguientes pasos para instalarlo: Actualiza la lista de los repositorios: eugenia@cochito:~$ sudo apt-get update Actualiza el Sistema Operativo: eugenia@cochito:~$ sudo apt-get upgrade Instala Python:
Raise Small-breed Milk Cows In 2006, Pat Schout and his wife, Elia, began homesteading in east-central Illinois. They wanted to raise their own food, including dairy products. They considered a milk cow, but didn’t know if they’d have enough pasture for a full-size cow and weren’t sure if they could manage all the milk a single cow can produce. Miniature cows cost $1,800 to $3,500 depending on the size, markings and color. How small are small-breed Jerseys? Miniature cattle are classified in three categories as measured by height at the hip. How much milk do they give? A standard-size milk cow in peak production can give 6 to 10 gallons of milk per day. We make vanilla ice cream, mozzarella cheese, yogurt and butter. How much feed do the small-breed cattle require? That all depends on your philosophy concerning cattle. When not on pasture, I try to feed my cattle high-quality alfalfa hay along with some beet pulp for a protein supplement. How much pasture would a single small-breed cow require? No.
Housing positive energy feedback! - Tech News Par Robert PELZER - Président du BET BETEC Voici un exemple de bâtiment de 30 logements collectifs à énergie positive. Trois de ces logements ont été « instrumentés » pour connaître en continu les relevés de consommations réelles. Cette synthèse présentée lors de l’Université ICO du 11 au 13 mai 2011, vous livre les résultats. 1°/ Fiche signalétique du projet BEPOS 30 logements à structure bois type BEPOS ; à énergie positive « Les Héliades » Z.U.S. de Saint Roch Saint-Dié-Des-Vosges SA Le Toit Vosgien – BP 31 – 88100 SAINT DIE DES VOSGES Architecte F. 2°/ Intégration et structure bois L'intégration du projet à son environnement a conduit à réaliser au préalable une simulation dynamique pour déterminer le nombre de bâtiments, leur orientation, les positions dans le site et les uns par rapport aux autres. Une structure bois a été choisie comme mode constructif pour les 2 bâtiments 3°/ Vecteur air pour le chauffage 4°/ Relevés des températures sur 1 an 5°/ Relevés des consommations de chauffage
Designing food systems to protect nature and get rid of hunger Hunger and malnutrition is manmade. It is in the design of the industrial chemical model of agriculture. And just as hunger has been created by design, producing healthy and nutritious food for all can be designed through food democracy. That is what we do in Navdanya. That is what the diverse movements for food sovereignty and agro-ecology are designing on the ground. We are repeatedly told we will starve without poisons and chemical fertilisers. Industrial production has led to such a severe ecological and social crisis, to ensure the supply of healthy food, we must move towards agro-ecological and sustainable systems of food production that work with nature, not against her. Industrialisation of agriculture creates hunger and malnutrition, yet further industrialisation of food systems are offered as cures for the crisis. Root causes Agriculture policy focuses on increasing yields of individual crops - not the output of the food system and its nutritional value. Biodiversity dysfunction