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Journal of the Acoustical Society of America

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Feb 2005

Volume 117, Issue 2, pp. 465-972

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Help! There are 60 screaming kids in my lab!—Outreach activities for 5th graders (L)

Corinne M. Darvennes

J. Acoust. Soc. Am. Volume 117, Issue 2, pp. 483-485 (2005); (3 pages) | Cited 1 time

Online Publication Date: 31 Jan 2005

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In this letter a day of hands-on activities for 60 5th graders is described in the Acoustics and Vibrations Laboratory at TTU. This includes the logistics of having 60 kids in the lab and keeping their attention, a description of each activity, and the equipment used. The purpose of this publication is to encourage my colleagues to reach out to the next generation of scientists and engineers, by showing them that a few well-targeted activities do not take a gargantuan effort but have a big impact. © 2005 Acoustical Society of America.
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43.10.Sv Education in acoustics, tutorial papers of interest to acoustics educators

Some comments on Sabine absorption coefficient (L)

K. S. Sum

J. Acoust. Soc. Am. Volume 117, Issue 2, pp. 486-489 (2005); (4 pages)

Online Publication Date: 31 Jan 2005

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The case of a nonzero reverberation time when all absorptive surfaces in a room have values of Sabine absorption coefficient of one, the existence of values of the coefficient that are larger than one, and the difference of the coefficient from the statistical absorption coefficient, are well known. So far, the reasons for these phenomena are still unclear. This letter provides a new perspective to the classical problem of sound absorption where physical interpretations of the Sabine absorption coefficient are given for different types of absorptive surface and conditions of the sound field in rooms. © 2005 Acoustical Society of America.
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43.55.Br Room acoustics: theory and experiment; reverberation, normal modes, diffusion, transient and steady-state response
43.55.Dt Sound absorption in enclosures: theory and measurement; use of absorption in offices, commercial and domestic spaces
43.55.Ev Sound absorption properties of materials: theory and measurement of sound absorption coefficients; acoustic impedance and admittance

A note on pure-tone masking by broadband noise under free-field and insert-phone conditions (L)

Adrianus J. M. Houtsma

J. Acoust. Soc. Am. Volume 117, Issue 2, pp. 490-491 (2005); (2 pages)

Online Publication Date: 31 Jan 2005

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Free-field experiments on masking of low-frequency tones by broadband noise, as reported by Fidell, et al. [J. Acoust. Soc. Am. 73, 628–638 (1983)] should, in principle, yield the same results as the recently reported insert-phone experiment by Houtsma [J. Acoust. Soc. Am. 115, 967–970 (2004)]. Indeed, if Fidell et al.’s data are converted to critical ratios and compared with the recent insert-earphone results, both turn out to be quite similar and significantly different from Hawkins and Stevens’ classical critical ratio results.
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43.66.Dc Masking
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