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sexta-feira, 15 de abril de 2011

Progresso nos Painéis Solares

Uma descoberta deu origem à utilização DIRECTA  da Luz Solar, isto é, uma transformação da luz num campo magnético forte, MUITO IMPORTANTE para os nossos Países cheios de Sol...

Discovery paves way for “optical battery” to generate solar power without solar cells

By Darren Quick

It has long been thought that, even though light has electric and magnetic components, the effects of the magnetic field are so weak that they could effectively be ignored. Now researchers at the University of Michigan (U-M) have discovered that under the right conditions, a light field can generate magnetic effects that are 100 million times stronger than previously expected. The researchers say the discovery paves the way for the creation of an "optical battery" that could harness power from the sun without the use of solar cells.
Stephen Rand, a professor in the departments of Electrical Engineering and Computer Science, Physics and Applied Physics, and his colleagues found that if light focused to an intensity of 10 million watts per square centimeter (W/cm2) is traveling through a material that does not conduct electricity, such as glass, the light field can generate magnetic effects with the strength equivalent to a strong electric effect.



Uma nova protecção para os Aviões a Jacto, contra a areia e até doses pequenas de cinza de vulcão...

New coatings could protect jet engines from volcanic ash

By Ben Coxworth

Following last April's historic eruption of the Eyjafjallajökull volcano in Iceland, commercial flights were cancelled within most of Europe for several days – it was the largest disruption of air travel since the Second World War. Well, while no one is suggesting that airliners could now merrily fly right through clouds of ash, researchers from Ohio State University (OSU) have developed a coating that they say could allow jet engines to better withstand small amounts of volcanic ash that are ingested over time.
The metallic parts of jet engines are already coated with a ceramic thermal barrier coating, that allows them to withstand the 2500F (1371C) temperatures that occur during regular operations. When volcanic ash is sucked into an engine, however, it melts onto the coating and penetrates it. That ash becomes a brittle glass upon cooling and it flakes off, taking the coating with it.





E um Plástico barato de produzir avisa da deterioração dos alimentos...

Inexpensive plastic developed that indicates freshness of food

By Ben Coxworth
When it comes to buying packaged meat and fish, consumers usually just have to go by the "best before" label to know that it hasn't begun to spoil. Needless to say, the dates on those labels are just estimates and certainly won't tell you if the product has sat through a lengthy power failure, or been left out of the cooler for several hours. Researchers from the Fraunhofer Research Institution for Modular Solid State Technologies in Munich, however, have developed an inexpensive plastic film that will change color in the presence of rotten foods.
The film would be applied to the inside of food packaging, where it would respond to the biogenic amines produced by decaying meat or fish. If a sufficient amount of amines were present in the air within the sealed packaging, they would cause dye in the film to turn from yellow to an obvious blue.

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