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Laughing hyenas, wailing levees, the sound of cheese and blaring bagpipes
Date:4/24/2009

lies between southwest Iceland and Greenland. In the 1800s they were heavily hunted in this area and haven't been seen much there since. Recently acoustic sensors stationed in this channel have discovered a return of right whales to their old territory. According to David Mellinger at the Oregon State University, the right whales were located and identified by their distinctive "up calls," which are part of the animals' extensive vocalization repertory. Owing to the low number of right whales, the return of the animals to a former whaling ground is an exciting discovery, says Mellinger.

The talk "Acoustical rediscovery of right whales in a former whaling area, the Cape Farewell Ground, between Greenland and Iceland" (3aAB9) is at 10:45 a.m. on Wednesday, May 20. Abstract: http://asa.aip.org/web2/asa/abstracts/search.may09/asa583.html


13) CLOGGED PIPES MAKE A SPECIAL SOUND

One way to find a clog under a sink is to take on the dirty job of dismantling the pipes. Now mathematician Alex Tolstoy, of ATolstoy Sciences in the United States, and colleagues at the University of Bradford in the United Kingdom have developed a cleaner way that hears where a blockage is located, using a technique pioneered in underwater acoustics. With further development, the method could be used to remotely track down problems in unpleasant areas like sewer lines.

The group built a device that -- like the echolocation used by bats and dolphins -- sends out high-pitched frequencies and listens to the sounds that bounce back. The listening device first records the profile of reflected sound coming back from an empty pipe. When the pipe is blocked, this sound profile changes. Using a signal-processing technique called matched-field processing, Tolstoy picks out the more important changes and calculates how long these frequencies took to bounce back to the two micr
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Contact: Jason Bardi
jbardi@aip.org
301-209-3091
American Institute of Physics
Source:Eurekalert

Page: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

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