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Gunderboom, Inc. | In partnership with seventy percent of the Earth
Earth Gunderboom® SAS™ Sound Attenuation System (continued) Protection against high and low frequencies Submarine construction activities such as underwater demolition and pile driving generally produce ... attenuation techniques, Gunderboom's SAS™ cushions against sound waves of all frequencies, including far-reaching, low-frequency sounds that are the most damaging. How the Gunderboom® ...
www.gunderboom.com

OMI: Underwater Noise Pollution
Hz in heavy shipping areas The leading noise producers are oil tankers and bulk dry ships Icebreakers cause avoidance reactions in narwhales, belugas, walruses Some whales rely on low-frequency sound for communication over vast distances These are the same frequencies occupied by vessel noise Some scientists are ...
www.oceanmammalinst.org

OMI's Dr. Green Talks in Berlin
LFAS and other high intensity sonar technologies. Some of these sonars, like LFAS, use low frequencies while others use mid-frequency signals. All of these high intensity active sonars, regardless of ... , but LFAS has received the most public attention because the signals travel farther than other frequencies and it, therefore, has the potential to affect larger areas of the ocean. I have ...
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Standards and Recommendations Electromagnetic Field Exposure
Swedish standards for computer monitors are far stricter that the ANSI standards in the low frequencies. More Standards: EMF WORLD WIDE STANDARDS Info from International EMF Project Look up ... ; * extremely low-frequency fields, including power-line fields at 60 Hz; * radio-frequency (rf) fields and radiation with frequencies below 300 MHz; and * microwave radiation with frequencies between 300 ...
lessemf.com

Manatee Brain
However, intensity is generally most useful at higher frequencies. So sound localization is suspected to be poor. MIDDLE EAR: Ovoid tympanic space ( ... cavities favor low frequencies. Middle ear system of manatus is large and mass dominated, implying low freq tuning, but extreme density of the oscines adds stiffness, Consequently, transmission of low freq will ...
manateebrain.org

Rattlesnake Research at Lindsay
Although rattlesnakes can hear very low frequencies and vibrations, their rattles exist for the benefit of the predator. Rattlesnakes’ primary predator is ...
mdia.org

Noise: Occupational: Heaing Protection Selection
H - High, M - Medium and L - Low frequency attenuation values in accordance with BS EN ISO 4869-2: 1994 Single Noise Rating ... simpler methods become less accurate where the noise is dominated by tonal noise, particularly at low frequencies. Suggestions for Instrumentation can be found on this site . Considering each method in turn. 1 ...
noisenet.org

Noise: Building Acoustics: Reverberation Time
For speech, the reverberation time should be the same at all frequencies, but for music the reverberation at low frequencies should be increased so that the time at 125 Hz is up ...
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Noiseletter - Spring 2001, Page 4
The following is an abstract of a presentation on the deleterious health effects of low frequencies entitled, "Boom Cars: Noise Pollution at its Worst." The research was presented December 7 ... Contrary to boom car enthusiasts' popular belief that intense low frequencies would not harm hearing (program contents are often devoid of higher frequencies), medical research has proven that "feeling" the ...
quiet.org

WATER, Elixir or Poison?
At lower levels of contamination, with low concentrations of highly toxic chemicals like dioxin or radioactive materials, the water may be ... cooking, microwaving, or irradiating food; aluminum in drinking water, beer and soft drinks; and extremely low frequencies (ELF's) from hair dryers, TV sets, computers, and even washing machines! The best ...
newfrontier.com