Volume 3, Issue 3, July 2007
Index of content:
3(2007); http://dx.doi.org/10.1121/1.2961153View Description Hide Description
In 1973 a significant building in the history of acoustics was destroyed. Harvard University's first Fogg Art Museum, which housed the lecture room that prompted Wallace Clement Sabine's interest in architectural acoustics, was demolished. However, a link to this space was preserved so its acoustical characteristics can be explored again. As computer models and auralization become ubiquitous for projects, the use of the computer model for renovation as a yardstick for comparing various options is an attractive supposition. But, this can only be the case if the “original” model can be considered “accurate.” In this study, an attempt is made to create a calibrated model, based on historical measurements and post renovation measurements, turning back the clock to recreate and hence revisit this historical room.
3(2007); http://dx.doi.org/10.1121/1.2961154View Description Hide Description
In recent years, the diagnostic imaging community has shown considerable interest in developing techniques for measuring the optical properties of tissue with high spatial resolution. The optical properties governing light propagation through tissue include absorption and scattering. Absorption in the visible and near‐infrared wavelength range is related to tissue molecular structure, with the total absorption distributed between several tissue constituents including hemoglobin, water and lipids. Absorption measurements over a broad spectral band can be used to determine tissue composition, and ultimately tissue functional information such as oxygen saturation in blood or increased blood flow.
3(2007); http://dx.doi.org/10.1121/1.2961155View Description Hide Description
Many acousticians attend the triennial congresses organized by the International Commission for Acoustics (ICA), but they may not be aware of the other programs and services that the ICA now provides for the international acoustics community. The ICA has become more inclusive and proactive in its global outreach, as have many organizations and countries around the world. For the ICA, this new outreach has been prompted by the increasing need to coordinate and support the growing international interest and activity in acoustics. With that in mind, it would be helpful to understand how ICA functions, especially since it has recently been admitted as a Scientific Associate of the International Council for Science (ICSU).
3(2007); http://dx.doi.org/10.1121/1.2961156View Description Hide Description
If you ask a musician what makes music swing, he will reply that Swing is a feeling, and may mention counting or subdividing the beat. Commonly, in classic Jazz for example, triplet note subdivision is a feature in Swing music, but this is not the entire story. Otherwise a waltz (3/4 meter), or a 6/8 or 12/8 meter piece would inherently swing. Some pieces do, and some do not. There are also musical examples that one knows intuitively have Swing, but on close analysis do not appear to have triplet subdivision either as the main or only feature that contributes to the Swing. In this article, the authors presume that accent (differences in loudness between note events) also contributes to Swing, but thus far our research has focused solely on the timing aspects of swing rhythm. One aspect of Swing is interpreted to be the changes in the rhythmic structure around a solid and precise beat. It is the variations in that structure that are swinging.