The New Geopolitics of Food - By Lester R. Brown In the United States, when world wheat prices rise by 75 percent, as they have over the last year, it means the difference between a $2 loaf of bread and a loaf costing maybe $2.10. If, however, you live in New Delhi, those skyrocketing costs really matter: A doubling in the world price of wheat actually means that the wheat you carry home from the market to hand-grind into flour for chapatis costs twice as much. And the same is true with rice. If the world price of rice doubles, so does the price of rice in your neighborhood market in Jakarta. And so does the cost of the bowl of boiled rice on an Indonesian family's dinner table. Welcome to the new food economics of 2011: Prices are climbing, but the impact is not at all being felt equally. Already in 2011, the U.N. More alarming still, the world is losing its ability to soften the effect of shortages. That's why the food crisis of 2011 is for real, and why it may bring with it yet more bread riots cum political revolutions.
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()
OECD calls for policy reform and technology to prevent impending water crisis The OECD has released a report outlining the challenges humanity faces to maintain water resources in the future (Photo: Shutterstock) Image Gallery (2 images) Worldwide population growth and the related rapid increase in urbanization is already posing problems in many areas for the management of that most precious of resources, water. With these problems only set to intensify, the Organization for Economic Co-Operation and Development (OECD) has released a report outlining the challenges humanity faces to maintain water resources in the face of demographic growth and climate change. Called Meeting the Water Reform Challenge, the report says that urgent reform of water policies is crucial in order to preserve human and environmental health as well as economic growth. According to UN figures, more than one billion people lack access to safe drinking water. Global water demand (Source: The Environmental Outlook Baseline,output from IMAGE suite of models) Source: OECD About the Author
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:
-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:
Only Organics Can Feed the Hungry World: Here's Why Students working on UGA's organic demonstration farm in summer 2012. (Photo: UGA College of Ag)A new approach to agriculture that combines the best in industrial production with organic and sustainable practices is the key to meeting the changing needs of a changing world, where resources are rapidly depleted by a growing population. "Are Organic Foods Safer or Healthier Than Conventional Alternatives?" is the title of a controversial report released last week by Stanford University's Center For Health Policy. The press weighed in with a bewildering range of instant reactions. The LA Times, on the other hand, pointed out in an editorial that the study largely ignored the ill effects of pesticide residues on conventionally-grown produce, and the hormones and antibiotic-resistant bacteria that taint factory-farmed meat and poultry. "When I started out farming," he told me, "it was like showing up at an assembly line day in and day out. No surprise there.
Lenguaje ensamblador para computadoras basadas en Intel®, 5ta Edición – Kip R. Irvine La quinta edición de Lenguaje ensamblador para computadoras basadas en Intel, enseña la programación en lenguaje ensamblador y la arquitectura del procesador Intel IA-32; el texto es apropiado para los siguientes cursos universitarios: Programación en lenguaje ensamblador. Fundamentos de los sistemas computacionales. Fundamentos de la arquitectura computacional. Los estudiantes utilizan los procesadores Intel o AMD y programan con Microsoft Macro Assembler (MASM) 8.0, que se ejecuta en cualquiera de las siguientes plataformas MS-Windows: Windows 95, 98, Millenium, NT, 2000 y XP. Aunque este libro se diseñó en un principio como texto de programación para estudiantes universitarios, ha evolucionado a lo largo de los últimos 15 años en algo mucho más completo. Énfasis de los temas Esta edición incluye temas que conducen de una manera natural hacia cursos subsiguientes en arquitectura computacional, sistemas operativos y escritura de compiladores: Concepto de máquina virtual. Contenido: Prefacio
Bhutan To Be First Country to Go 100% Organic If there was ever a nation that could see the purpose behind organic, sustainable farming, it would be a nation that is composed mostly of farmers. Such a place does exist, and it soon may be the first nation to go 100% organic, paving the way for others to do the same on a global scale. The Himalayan kingdom of Bhutan is known for a high level of citizen happiness, but it is doing something even more noteworthy in the near future. With Prime Minister Jigmi Thinley making a major announcement regarding the organic farming project at the Rio+20 Conference on Sustainable Development which took place last month, the move has made national headlines. It’s called the National Organic Policy, and it is fueled by the simple concept that working ‘in harmony with nature’ will yield the most powerful results — all without sacrificing human health or the environment. “By working in harmony with nature, they can help sustain the flow of nature’s bounties.”