Results 131 to 140 of about 1,132 (177)
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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
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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
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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
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The Journal of the Acoustical Society of America, 2022
The results of study of temporal variations of the characteristics of infrasound (amplitudes, coherences, grazing angles, azimuths and horizontal phase speeds) detected during a passage of warm and cold fronts through the networks of microbarometers in the Moscow region are presented.
Igor P. Chunchuzov +3 more
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The results of study of temporal variations of the characteristics of infrasound (amplitudes, coherences, grazing angles, azimuths and horizontal phase speeds) detected during a passage of warm and cold fronts through the networks of microbarometers in the Moscow region are presented.
Igor P. Chunchuzov +3 more
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Progress in Biophysics and Molecular Biology, 2007 Definitions of infrasound and low-frequency noise are discussed and the fuzzy boundary between them described. Infrasound, in its popular definition as sound below a frequency of 20 Hz, is clearly audible, the hearing threshold having been measured down to 1.5 Hz. The popular concept that sound below 20 Hz is inaudible is not correct.
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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
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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
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Trauma of the Ear from Infrasound
Acta Oto-Laryngologica, 1982Twenty-eight chinchillas received continuous or intermittent infrasound (1, 10, 20 Hz) at 150, 160, or 170 dB SPL; there were 7 controls. Serial sections of the temporal bones were examined using light microscopy. Pathologies noted were tympanic membrane perforation, stapes subluxation, bleeding from the middle ear mucosa and tensor tympani, strial ...
D J, Lim +3 more
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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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Coherency of infrasound studied with a large aperture infrasound array in the Netherlands
The Journal of the Acoustical Society of America, 2008A large aperture infrasound array (LAIA) is being constructed in the Netherlands as geophysical part of an astronomical low frequency array, i.e., the LOFAR project. This array extends the detection capabilities of infrasound up to the mHz range, including acoustic-gravity and gravity waves as well.
Johan Mentink, Laeslo G. Evers
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Explosion localization via infrasound
The Journal of the Acoustical Society of America, 2009Two acoustic source localization techniques were applied to infrasonic data and their relative performance was assessed. The standard approach for low-frequency localization uses an ensemble of small arrays to separately estimate far-field source bearings, resulting in a solution from the various back azimuths. This method was compared to one developed
Curt A L, Szuberla +2 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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