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sexta-feira, 18 de junho de 2010

Os Dirigíveis estão de volta!

Os Dirigíveis estão de volta!

Northrop Grumman to build football field-sized hybrid airship

By Noel McKeegan

01:38 June 16, 2010

Not so long ago it seemed that the golden age of giant lumbering airships had gone down with the Hindenberg, consigned to less spectacular roles in research, advertising and as a great camera platform above sporting events... but they're making a comeback. Lighter-than-air aircraft are returning to passenger carrying roles in tourism and in recent years we've seen a new-generation of airships put forward as a cargo-lifting solution (DARPA's now seemingly shelved Walrus Project) and even as a corporate air yacht (Aeroscraft ML866). Now the U.S. Army is moving quickly to build a hybrid airship weapons system that will act as a long-duration UAV – a very big, long duration UAV. The Long Endurance Multi-Intelligence Vehicle (LEMV) will be longer than a football field and stay aloft at altitudes of 20,000 feet for more than three weeks at a time providing an "unblinking eye" for surveillance and reconnaissance.
E nano-estruturas, vejam a escala, aquele espaço é de NM de comprimento!

A fragment of a superconducting thin film patterned with nano-loops measuring 150 nanometers on a side (small) and 500 nanometers on a side (large), where the nano wires making up each loop have a diameter of 25 nanometers.
Brookhaven National Laboratory has fabricated thin films patterned with large arrays of nanowires and loops that are superconducting — able to carry electric current with no resistance — when cooled below about 30 kelvin (-243 degrees Celsius). Even more interesting, the scientists showed they could change the material’s electrical resistance in an unexpected way by placing the material in an external magnetic field. Superconducting nanowires and nano-loops might eventually be useful for new electronic devices

Nature Nanotechnology - Large oscillations of the magnetoresistance in nanopatterned high-temperature superconducting films

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