Page 6 - Jan2013

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
Articles:
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.
Departments:
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
Table of Contents 5