Natural Science Forum / Physics / Acoustics / September 2009

I just recently heard that acoustic excitation has been used to anneal
welds as the are being made. Crudely, I presume that it would be
analogous to using a tamper for compacting concrete.
Please tell me where I can find more information on the subject.

   I just cam back from investigating a situation where a lady was
complaining of sounds that did not cease, typically faint high frequency
sounds within her house and at its outside perimeter. Tinnitus aside
(arbitrary whether she has tinnitus; if so, it's incipient and ...

well I have a simple question.
i own a place for my band's practice (rock) and for recording our
originals. (all in one room studio)
however i've covered all the corners with superchunk basstraps which i