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segunda-feira, 27 de junho de 2011

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Uma boa, para TODO ESTE CALOR, uma nova Liga metálica que converte o calor em electricidade!


New alloy converts heat directly into electricity

By Ben Coxworth

The heat given off by electronics, automobile engines, factories and other sources is a potentially huge source of energy, and various technologies are being developed in order to capture that heat, and then convert it into electricity. Thanks to an alloy that was recently developed at the University of Minnesota, however, a step in that process could be saved - the new material is able to convert heat directly into electricity.

The multiferroic alloy, with the catchy name Ni45Co5Mn40Sn10, was created by combining its various elements at the atomic level. Multiferroic materials are known for having unique elastic, magnetic and electric properties, and in the case of this alloy, that takes a form of an usual phase change. When heated, the non-magnetic solid material suddenly becomes a strongly magnetic solid.

In a lab test, upon becoming magnetic, the material absorbed heat in its environment and proceeded to produce electricity in an attached coil. Although some of the heat energy is lost in a process known as hysteresis, the U Minnesota researchers have developed a method of minimizing that energy loss.




Uma maravilha, este projecto Britânico, ainda há lá Cabecinhas Pensadoras!


ESA review finds 'no impediments' for SKYLON spaceplane development

By Darren Quick

After nearly 30 years of service, the Space Shuttle fleet is due to enter retirement with the last ever mission scheduled for takeoff on July 8, 2011. In its lifetime, the world's first Reusable Launch Vehicle (RLV) has provided information that will prove invaluable for the next generation of spacecraft that will succeed it. One such craft is the Skylon, an unpiloted, single-stage, reusable spaceplane currently under development by UK-based Reaction Engines Ltd. (REL). The Skylon got a shot in the arm last month with the release of a technical review of Skylon carried out by the European Space Agency (ESA) that concluded there are "no impediments" that would prevent the continued development of the Skylon and its SABRE engine.
The Skylon design, which grew out of the HOTOL (Horizontal Take-Off and Landing) program by Rolls Royce and British Aerospace that was terminated in 1988, consists of a slender fuselage containing propellant tankage and payload bay, with delta wings attached midway along the fuselage carrying the SABRE engines in axismmetric nacelles on the wingtips.

With a payload bay measuring 4.6 m (15 ft) in diameter and 12.3 m (40 ft) long, Skylon is designed to transport up to 15 tons of cargo into Low Earth Orbit (LEO, approx. 300 km /186 mile) at about 1/50th of the cost of traditional expendable launch vehicles, such as rockets. It could also carry 10.5 tons to a 460 km (286 mile) equatorial space station, or 9.5 tons to a 460 km x 28.5 degree space station, when operating from an equatorial site.



...Não foram a Paris, ver os Aviões?
Vejam nesta página, carreguem no Link:
The 2011 Paris Airshow in pictures


By Noel McKeegan

Over two thousand international exhibitors, 142 aircraft and tens of thousands of visitors gathered at the Le Bourget exhibition center this week for the 49th International Paris Airshow. Despite some grey skies and unwelcome rain, crowds were treated to spectacular daily flying displays and insights into bleeding-edge aerospace technologies that will shape the way we travel around the planet - and beyond - in the 21st Century. Gizmag joined the throng of media organizations soaking up all that the show has to offer - here's our summary of the week in pictures.

http://www.gizmag.com/2011-paris-airshow-photos/19022/

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