Natural Science Forum / Physics / Acoustics / April 2005

Skip to the end for the question if you don't feel like reading the
whole set-up.
I live in an urban downtown district, and the builder had the bad idea
of putting the bedroom at the front of the building.  I live on the

I am starting to get interested in resonator type absorbers for an
application I have in mind where porous bulk absorption is not an
option. I went down to the chemical stock room and got a few glass
Erlenmeyer flasks - a 5000 cc, a 500 cc, etc. Round globes, short

I have chosen a chat room handle for him;
BEN16.
Ang.

Friends:
I want to ask if the t60 depends on the position in a big space,
specifically a basquet stadium. In this order is better to take T60
measurements in various points or everyone give the same result?. a

Does anyone know of a good book or article on Tonpilz transducer design?
If I have a Terfenol-D rod 1.5" long, it will probably have a resonant
frequency somewhere around 60 kHz but I want to drop it down to 15-18
kHz and I'd like some way to know how much mass to attach to it ...

Hi, All;
I want to do some experiments with magnetostrictive transducers,
particularly rings. I have the idea to fire a jolt of high voltage from
an electronic flash unit into a  ring of Terfenol- D  whose resonant

I have been asked to look at the possibilities of creating glazing
configuration to provide
50-63dB Rw. My own view is that these levels of reduction are probably
unachievable

Hi all, my name is nanggroe, I am a research student in Acoustics Lab.
Univ. Technology Malaysia.I am a new comer here.. nice to join with you
all.
I am studying about perforated panel sound absortion coefficien using

I have had a request to predict the noise from a waterfall or a
fountain in a condo development.
The water is flows from a small pool down an incline about 10 - 15
degrees from vertical and the drop is about 2 metres to another pool.

A moment of silence, all.
Pope John Paul just died.
Angelo Campanella

I'm aware that, in domestic compact cassettes, if you listen to a
blank, or silent area on one side of a tape, you can hear a faint,
reversed "echo" from the other side. I believe that this is due to the
audio tape being very tightly wound and the magnetic impressions being