Results 251 to 260 of about 18,047 (294)
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The Journal of the Acoustical Society of America, 2012
The generation of infrasound from the pulsation of compressed air is examined analytically and experimentally to explore the aerodynamic physics as well as engineering implementations. Several model experiments were developed and utilized to explore the problems associated with this approach.
Thomas Muir +4 more
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The generation of infrasound from the pulsation of compressed air is examined analytically and experimentally to explore the aerodynamic physics as well as engineering implementations. Several model experiments were developed and utilized to explore the problems associated with this approach.
Thomas Muir +4 more
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Topographic effects on infrasound propagation
The Journal of the Acoustical Society of America, 2012Infrasound data were collected using portable arrays in a region of variable terrain elevation to quantify the effects of topography on observed signal amplitude and waveform features at distances less than 25 km from partially contained explosive sources during the Frozen Rock Experiment (FRE) in 2006.
Mihan H, McKenna +5 more
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Infrasound-convection instability.
The Journal of the Acoustical Society of America, 2010Heated below temperature stratified atmospheric layer is unstable and convection flow can be developed in such an area. Convection happens because warm less dense air goes up while cooler air comes down. Infrasound can initiate convection flow and being amplified by the flow. The process of infrasound-convection interaction is considered in the present
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1998
Ultrasound and infrasound differ from “ordinary” sounds in three distinct ways that influence all the considerations of this chapter. The first and most obvious characteristic of these sound types is that, by definition, they are “extreme” frequencies that fall outside the normal response curve for the human ear (see Figure 1) and are therefore ...
J. D. Pye, W. R. Langbauer
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Ultrasound and infrasound differ from “ordinary” sounds in three distinct ways that influence all the considerations of this chapter. The first and most obvious characteristic of these sound types is that, by definition, they are “extreme” frequencies that fall outside the normal response curve for the human ear (see Figure 1) and are therefore ...
J. D. Pye, W. R. Langbauer
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Detecting and characterizing infrasound signals with optical fiber infrasound sensors
The Journal of the Acoustical Society of America, 2005Optical Fiber Infrasound Sensors (OFIS) are long compliant tubes wrapped with two optical fibers that interferometrically measure the differential pressure variation along the length of the tube. Because each sensor averages spatially along the length of the tube, the frequency response of the recorded pressure variation is a function of the ...
Kristoffer Walker +4 more
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Journal of Atmospheric and Terrestrial Physics, 1971
Abstract We consider atmospheric pressure variations in the period range from a few seconds to a few minutes. These pressure fluctuations arise 1. (a) from local hydrodynamic effects which are estimated; 2. (b) from nonpropagating pressure effects associated, for example, with a jet stream; 3.
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Abstract We consider atmospheric pressure variations in the period range from a few seconds to a few minutes. These pressure fluctuations arise 1. (a) from local hydrodynamic effects which are estimated; 2. (b) from nonpropagating pressure effects associated, for example, with a jet stream; 3.
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The Journal of the Acoustical Society of America, 1978
A trial was made to investigate cardiopulmonary response to infrasound (IFS) in man and dogs whose whole body were exposed to high level (110 dB SPL) of infrasound (8–50 Hz), produced by a powerful speaker system. Experiments on man revealed that heart rate and respiratory frequency decreased by the mean values of 10% and 20% respectively but no ...
O. Okai +6 more
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A trial was made to investigate cardiopulmonary response to infrasound (IFS) in man and dogs whose whole body were exposed to high level (110 dB SPL) of infrasound (8–50 Hz), produced by a powerful speaker system. Experiments on man revealed that heart rate and respiratory frequency decreased by the mean values of 10% and 20% respectively but no ...
O. Okai +6 more
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Seismometers as infrasound sensors
The Journal of the Acoustical Society of AmericaAn experiment was conducted in West-Central Mississippi in which five explosive charges were detonated. The TNT equivalent sizes of the charges ranged from 0.57 to 10.91 kg (1.25 to 24 lb). Among the arrays of sensors deployed, seismometers were deployed near microphones at distances of 0.5, 2.1, and 8.4 km from the source.
Richard D. Costley +4 more
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