Throughout decades of research on solar cells, one formula has been considered an absolute limit to the efficiency of such devices in converting sunlight into electricity: Called the Shockley-Queisser efficiency ...
Apr 18, 2013
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(Phys.org)—ESA research has helped to develop an aircraft-grade alloy that is twice as light as conventional nickel superalloys while offering equally good properties. The path to creating this alloy required ...
Nov 06, 2012
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An experimental unmanned aircraft developed for the U.S. Air Force has flown at more than five times the speed of sound in a test off California.
May 03, 2013
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(PhysOrg.com) -- Scientists at the University of Glasgow have, for the first time, been able to drag light by slowing it down to the speed of sound and sending it through a rotating crystal.
Jul 06, 2011
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(PhysOrg.com) -- While physicists at the Large Hadron Collider smash together thousands of protons and other particles to see what matter is made of, they're never going to hurl electrons at each other. No ...
Jan 12, 2012
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An unmanned glider streaks over the Pacific Ocean at 20 times the speed of sound in a video released Thursday by a U.S. defense research agency experimenting with technology that could give the military the ...
Aug 25, 2011
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(PhysOrg.com) -- When trying to focus sound waves into as small an area as possible, scientists run into a fundamental limit called the diffraction limit. That is, when sound waves are focused into a region ...
Jul 12, 2011
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The Pentagon on Thursday held a successful test flight of a flying bomb that travels faster than the speed of sound and will give military planners the ability to strike targets anywhere in the world in less than a hour.
Nov 17, 2011
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(PhysOrg.com) -- Some six billion light years distant, almost halfway from now back to the big bang, the universe was undergoing an elemental change. Held back until then by the mutual gravitational attraction ...
Mar 30, 2012
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University of Illinois physicists have experimentally demonstrated for the first time how three-dimensional conduction is affected by the defects that plague materials. Understanding these effects is important ...
Oct 07, 2011
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Second sound is a quantum mechanical phenomenon, which has been observed only in superfluid helium. Physicists from the University of Innsbruck, Austria, in collaboration with colleagues from the University ...
May 15, 2013
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(Phys.org) -- The word “cochlea” comes from the Latin for “snail shell.” While this inner ear component has a clear spiral shape, it’s currently unclear why that is. In the 1980s, ...
Jun 14, 2012
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Austrian daredevil Felix Baumgartner made a record-breaking leap from the edge of space Sunday, landing safely in the New Mexico desert after freefalling from more than 24 miles above the Earth.
Oct 14, 2012
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A carbon-nanotube-coated lens that converts light to sound can focus high-pressure sound waves to finer points than ever before. The University of Michigan engineering researchers who developed the new therapeutic ultrasound ...
Dec 19, 2012
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Supersonic Austrian skydiver Felix Baumgartner was faster than he or anyone else thought during his record-setting jump last October from 24 miles (38 kilometers) up.
Feb 04, 2013
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