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Dinosaur hearing, listening to muscle noise, quieter cubicles

fated Mars Polar Lander in 1999--and explain how it has stimulated ideas for acoustical exploration of space (3aPAb2). Michael Yang of ATA Engineering in San Diego (michael.yang@ata-e.com) will discuss acoustical issues associated with SpaceX's Falcon 1. The Falcon 1 is designed to minimize the price per launch and increase reliability for low-Earth-orbit satellites (2pSA1).

MYTH-BUSTING IN MUSICAL INSTRUMENTS

Do violin and guitar instruments truly improve their sound quality and playability over time" Examining this "played in" theory, Andrew Piacsek of Central Washington University (piacsek@cwu.edu) will review the state of current knowledge on this question, and will propose specific ideas for helping to resolve this issue (4pMU5). Scientist and instrument-maker Richard Smith (richard@smithwatkins.com) will dispel and correct what he has identified to be some mistaken notions about brass instruments. For example, Smith says, trumpets are not supposed to play high notes around the frequency range of 2 kHz, according to some acoustics textbooks, yet some skilled trumpet players are able to hit those frequencies. In addition, he says, manufacturers and teachers sometimes incorrectly apply the concepts of fluid dynamics to the study of brass instruments, giving improper scientific authority to some teaching statements and product descriptions (4pMU1). In wind instruments, an area of controversy has been whether their sound quality and responsiveness are significantly affected by the thicknesses of an instrument wall and the exact materials of which the wall is made. Many acousticians had assumed that the main important factor was the profile of a wind instrument's bore, the chamber where air vibrates and produces pitch. Wilfried Kausel of the University of Music and Performing Arts in Austria (

Source:American Institute of Physics


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