( er (less than 20 meters deep) choke poi...)Dinosaur hearing, listening to muscle noise, quieter cubicles

er (less than 20 meters deep) choke points of harbor entrances, which often have high levels of ambient noise. Peter J. Stein (pstein@scisol.com) of New Hampshire-based Science Solutions, Inc. will present the Swimmer Detection Sonar Network (SDSN), designed to be a cost-effective method to protect a large area from swimmers intending to carry out terrorist activities. The in-water system consists of sets of sonar dishes that transmit and detect sound waves. Signal-processing algorithms provide automated detection, tracking, and classification of moving objects such as swimmers. The SDSN is already available commercially for wide-scale deployment (2pEA1). Two papers presented by scientists from Stevens Institute of Technology, Hoboken (papers 2aEA4 and 2aEA5) discuss acoustic measurements in New York's Hudson River. Details of acoustic noise produced by ship traffic will be presented by Heui-Seol Roh. The measurements may provide a basis for developing systems that can detect underwater threats. Brian Borowsky will present an estimation of the distances at which threats can be detected (2pEA6; contact Alexander Sutin, asutin@stevens.edu).

RESTORING QUIET IN NATIONAL PARKS

Is quiet an endangered resource in U.S. National Parks" According to Kurt Fristrup (kurt_fristrup@nps.gov) of the US National Park Service (NPS), the extraordinary quiet of many backcountry sites is increasingly compromised by aircraft noise. In order to fulfill their mandate to protect natural, cultural, and historic resources, as well as visitor experience, NPS has developed analytical tools to assess lost opportunities to hear and respond to the sounds of nature. At the Grand Canyon, efforts are being made to implement the National Parks Overflights Act of 1987, which calls for the timely, substantial restoration of natural quiet to the park f
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Source:American Institute of Physics

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