Natural Science Forum / Physics / Acoustics / August 2007

I'm looking for sources of conductive epoxy to be used in the manufacture of
power transducers.
 Have used impregnated mesh style that must be kept very cold before heat
cure,

    I am having difficulty transforming my access to these news groups when
using high speed internet access.
    The high speed worked News Net OK last night but not today...
    It seems to be my news reader software, Netscape "Mail and news

Can somebody here tell me why two piezo discs aren't used to get more
sound out of the unimorph design?
Ron

If most of the members are reading this MI5 newsletter it is fine.
I just dont understand the content.
Thanks
If there are many people who feel the same as i do, probably the

I've got to find a noise reducing solution for a flare at a water
treatment plant. The flare basically burns the methan from the wasted
waters. The noise isn't high, but an old lady leaving 500m away says
the noise causes her severe problems. I've been there to measure but

where would i get hold of "the propagation of noise from petroleum and
petrochemical complexes to neighbouring communities" by acoustic
technology AT. 674, 1977 and AT. 931 1980.
these are the supplement reports to the report published under the

Hi Group,
I live in an apartment and the rental property next to me has changed
tenants again this lot seem more noisy than last time.  So I am
planning on getting the common wall professionally sound proofed, but

I'm working on a noise map for en industrial plant. One source is a
the fan outlet of a dust collector. I have the noise level on axis but
this kind of noise source is very directionnal. I can't find in my
books any typical data / graph or formula to calculate directivity

I have been reading a lot about cavitation, sonocavitation etc. Recently I
viewed several short videos found by searching google for "cavitation
heater"
and I came across this

I have set up an indepance tube to measure the sound absorption
coefficients of certain materials, following ASTM C384-04: "Standard
Test Method for Impedance and Absorption of Acoustical Materials by
Impedance Tube Method". The problem is that I don't know how accurate

I think there is a large market for low power acoustic transducers
used to set up communication between controller and valves in an
irrigation system.
Currently this problem is usually solved by running two wires from the

Hopefully someone can help me. Is there an equation that will
determine how far a sound can be heard in certain atmospheric
conditions? The source of the sound is that of a firework (4th July,
or Guy Fawkes Night, as you prefer); atmopsheric temperature is about