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Latest Robert Behringer Stories

Grains Cause Meteorite Impact Waves To Spread Unevenly
2012-12-12 13:06:31

April Flowers for redOrbit.com - Your Universe Online Scientists at Duke University have gained a new microscopic picture of the way the energy of a meteorite or a missile transfers to sand and dirt grains by observing high-speed video of projectiles slamming into a bed of disks. The study, published in Physical Review Letters, showed that the transfer is jerky, not smooth as the researchers believed it would be. "It was surprising just how un-smooth the slow-down of the intruding...

2011-12-14 19:42:38

It's easy to get in a jam. But it's much harder to explain exactly how or when it started. Scientists still aren't sure what causes clogs in flowing macroscopic particles, like corn, coffee beans and coal chunks. But new experiments by Duke physicist Robert Behringer and his colleagues suggest that when particles undergo a force called shear strain, they jam sooner than expected. The results appear in the Dec. 15 issue of Nature. Shear strain is sort of like cupping sand between your...

2005-06-21 22:35:00

DURHAM, N.C. - Using color-changing plastic cylinders as a stand-in for a mass of granular material, Duke University physicists have created a computer-testable method to predict, particle-by-particle, how pushes, nudges and shoves at the edges transmit across large assemblages. Masses of unpredictable granular particles -- from the ice chunks that make up avalanche-prone snowfields to the coal in gigantic coal bins -- can abruptly change behaviors with sometimes catastrophic results. Such...


Word of the Day
lambent
  • Licking.
  • Hence Running along or over a surface, as if in the act of licking; flowing over or along; lapping or bathing; softly bright; gleaming.
This word comes the Latin 'lambere,' to lick.
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