Results 181 to 190 of about 4,692 (210)
Some of the next articles are maybe not open access.
A portable infrasound generator
The Journal of the Acoustical Society of America, 2009The rotary subwoofer is a novel low frequency transducer capable of efficiently generating infrasound from a compact source. A field-deployable version of this device may find application as a calibration source for infrasound arrays of the International Monitoring System (IMS) [(2001).
Joseph, Park, James, Robertson
openaire +2 more sources
The Journal of the Acoustical Society of America, 1974
The distortion of pure tones (1–16 Hz) caused by the nonlinearities of the middle ear was calculated. It is shown that the slope of the audibility curves for infrasound of Yeowart and Evans could be predicted, thus implying that infrasound might not be heard in the normal sense, but only heard as distortion after being transduced through the middle ear.
Daniel L. Johnson, H. von Gierke
openaire +1 more source
The distortion of pure tones (1–16 Hz) caused by the nonlinearities of the middle ear was calculated. It is shown that the slope of the audibility curves for infrasound of Yeowart and Evans could be predicted, thus implying that infrasound might not be heard in the normal sense, but only heard as distortion after being transduced through the middle ear.
Daniel L. Johnson, H. von Gierke
openaire +1 more source
Journal of Geophysical Research: Atmospheres, 2005
Infrasonic signals have been observed from 31 earthquakes by arrays of microphones operated by the Los Alamos National Laboratory between 1983 and 2003. The properties of the signals are presented. Signal amplitudes corrected for propagation and distance show a relation with seismic magnitude.
J. Paul Mutschlecner, Rodney W. Whitaker
openaire +1 more source
Infrasonic signals have been observed from 31 earthquakes by arrays of microphones operated by the Los Alamos National Laboratory between 1983 and 2003. The properties of the signals are presented. Signal amplitudes corrected for propagation and distance show a relation with seismic magnitude.
J. Paul Mutschlecner, Rodney W. Whitaker
openaire +1 more source
The Journal of the Acoustical Society of America, 2001
At the present developed procedures of evaluation of annoyance of low frequency noise (LFN) on human and occupational health are based on international standards, ISO 7196 and ISO 9612. These standards are based on levels of thresholds of the human auditory system and subjective observations of vibrations of human body impacted by infrasound waves.
Ryszard Panuszka, Zbigniew Damijan
openaire +1 more source
At the present developed procedures of evaluation of annoyance of low frequency noise (LFN) on human and occupational health are based on international standards, ISO 7196 and ISO 9612. These standards are based on levels of thresholds of the human auditory system and subjective observations of vibrations of human body impacted by infrasound waves.
Ryszard Panuszka, Zbigniew Damijan
openaire +1 more source
Infrasound radiation of cyclones
The Journal of the Acoustical Society of America, 2005Tropical cyclones produce strong perturbations of atmosphere and the ocean surface accompanied by acoustical radiation. Infrasonic signals in the 0.1−0.5 frequency band can be observed at distances of thousands of miles from the cyclone. The effect of infrasound radiation is connected apparently to the interaction of the counter-propagating sea-surface
openaire +1 more source
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
openaire +1 more source
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
openaire +1 more source
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
openaire +2 more sources
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
openaire +1 more source
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
openaire +1 more source
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
openaire +1 more source
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
openaire +1 more source