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terça-feira, 28 de dezembro de 2010

Petróleo em Portugal... Do Sol!

Uma maneira de transformar a Energia Solar em Combustível, Petróleo em Portugal!

Breakthrough solar reactor makes fuel from sunlight
By Darren Quick
17:23 December 26, 2010

Because conventional photovoltaic panels produce electricity directly from sunlight, the energy they generate must either be used as it is produced or stored – either in batteries or by using the electricity to produce a fuel that acts as a storage medium for the energy. Now U.S. and Swiss researchers have developed a prototype device that directly converts the Sun’s rays into fuels that can be stored, allowing the energy to be used at night or transported to locations where it is needed.

A BBC report citing a paper appearing in the journal Science describes how the prototype device uses a quartz window and cavity to focus sunlight into a cylinder lined with cerium oxide. Cerium oxide, also known as ceria, is hygroscopic (meaning that it attracts and holds water molecules from the surrounding environment) and will also absorb a small amount of carbon dioxide. As the sunlight heats the ceria, it thermochemically breaks down the water and carbon dioxide pumped into the cylinder to produce carbon monoxide and hydrogen that can be converted to a liquid fuel.

...E Como fazer os vossos próprios ROVs!

Education and inspiration via underwater robot
By Ben Coxworth
17:33 December 26, 2010

If you like gadgets, and you like the ocean, then you must like ROVs – it’s just that simple. For the uninitiated, ROVs (Remote Operated Vehicles) are small unmanned submarines that are used for underwater operations deemed too deep, dangerous or difficult for human divers. They’re tethered to a support ship, from which a human operator controls them in real time, watching a live video feed from an onboard camera. It’s all incredibly appealing to those of us who are fascinated by the prospect of what secrets lurk beneath the surface of the ocean... or of the local pond. A few dedicated souls go so far as to trying to create their own homebuilt ROVs, many of them turning to what has become the bible on the subject, Build Your Own Underwater Robot and other Wet Projects. Gizmag had a chance to talk to the two authors of the book, and found out what inspired them to pursue such an unlikely project.

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