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                 Acoustics Today
A Publication of the Acoustical Society of America
 Volume 9, Issue 1 January 2013
   Cover: The El Castillo pyramid of Chichen Itza (photography by Nico Felicien Declercq)
6 From the Editor
6 From the Guest Editor
8 On the Fascinating Phenomenon of Diffraction by Periodic Structures—Nico Felicien Declercq
From Hellenistic and Mayan mega-structures to micron- level diffraction gratings.
14 Microbubbles as Ultrasound Contrast Agents— Thomas J. Matula and Hong Chen
Ultrasound contrast agents will be important for diag- nosing and treating diseases.
22 A Simple Electronically-Phased Acoustic Array— Martin L. Smith, Michael R. Roddeweg, Kurt M. Strovink, and John A. Scales
Phased arrays provide flexible, electronically-steerable beams of sound for many applications
30 Report of ISO/TC 43, Acoustics, and ISO/TC 43/SC 1, Noise, Standards Meetings in Florianopolis, Brazil,
November 2012—Robert D. Hellweg, Jeff G. Schmitt, and Laura Ann Wilber
It is important that the United States have effective rep- resentation at ISO working group meetings because, in practice, the responses to comments on draft standards are determined during these meetings.
37 Acoustical News—Elaine Moran
Acoustical news from around the country and around the world.
40 The Business of Acoustics—Dick Stern 41 Passings—Dick Stern
A farewell to colleagues
Business Directory
46 Classified
Classified advertisements, including positions offered and positions desired.
47 Business card advertisements 48 Index to Advertisers
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