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Plugging Leaks in Seal Models

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Physics 5, 66 (2012) – Published June 15, 2012
Gaskets and other seals can stop leaks even if the leak-preventing surfaces have just 42 percent of their area in contact at the microscopic scale, according to computer simulations.
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Ultrasound Cleans with a Twist

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Phys. Rev. Focus 28, 7 (2011) – Published August 12, 2011
A rapidly expanding and collapsing microbubble in a fluid exerts forces strong enough to roll submerged particles stuck to a solid surface, which may explain how ultrasonic cleaning of jewelry and silicon wafers in a liquid removes dirt.