Results 41 to 50 of about 4,503 (228)
Skyfall: Signal Fusion from a Smartphone Falling from the Stratosphere
Signals, 2022 A smartphone plummeted from a stratospheric height of 36 km, providing a near-real-time record of its rapid descent and ground impact. An app recorded and streamed useful internal multi-sensor data at high sample rates.
Milton A. Garcés +8 more
doaj +1 more source
Measurement and characterization of infrasound from a tornado producing storm [PDF]
Journal of the Acoustical Society of America (2019), 146, 1528, 2018 A hail-producing supercell on 11 May 2017 produced a small (EFU) tornado near Perkins, Oklahoma (35.97, -97.04) at 2013 UTC. Two infrasound microphones with a 59-m separation and a regional Doppler radar station were located 18.7 km and 70 km from the tornado, respectively. Elevated infrasound levels were observed starting 7 minutes before the verified
arxiv +1 more source
Inhibitory effects of low decibel infrasound on the cardiac fibroblasts and the involved mechanism
Noise and Health, 2017 Introduction: Infrasound is a mechanical vibration wave with frequency between 0.0001 and 20 Hz. It has been established that infrasound of 120 dB or stronger is dangerous to humans.
Wei Jin +8 more
doaj +1 more source
Mechanical Filter-Based Differential Pressure Fiber-Optic Fabry-Perot Infrasound Sensor
IEEE Photonics Journal, 2021 A differential pressure fiber optic infrasound sensor based on a mechanical filter was developed, for the detection of infrasound within the frequency range of 0.01--1 Hz.
Peng Zhang +9 more
doaj +1 more source
Estimating tropospheric and stratospheric winds using infrasound from explosions [PDF]
The Journal of the Acoustical Society of America 146:2, 973-982, 7
August 2019, 2019 The receiver-to-source backazimuth of atmospheric infrasound signals is biased when cross-winds are present along the propagation path. Infrasound from 598 surface explosions from over 30 years in northern Finland is measured with high spatial resolution on an array 178 km almost due North.
arxiv +1 more source
Effects of infrasound on the perception of a low-frequency sound
Acta Acustica, 2023 The study investigated the effects of an 8 Hz infrasound sinusoid, presented at a sensation level (SL) of 9 decibels (dB), on the detection of i) a 64 Hz pure tone and ii) an 8 Hz sinusoidal amplitude modulation imposed on a 64 Hz sinusoidal carrier ...
Friedrich Björn +3 more
doaj +1 more source
Graphene Aerogels for Ultrabroadband Thermoacoustics [PDF]
Phys. Rev. Applied 14, 024022 (2020), 2020 Sound is usually generated in a medium by an electromechanical vibrating structure. The geometrical size and inertia of the structure set the frequency cutoff in the sound-transduction mechanism and, often, different vibrating structures are necessary to cover the whole range from infrasound to ultrasound.
arxiv +1 more source
Infrasound of a Wind Turbine Reanalyzed as Power Spectrum and Power Spectral Density [PDF]
, 2021 The infrasound levels due to the blade-tower interaction generated by a wind turbine in the publication by Pilger and Ceranna (JSV, Vol. 388, pp. 188-200, 2017) have to be corrected to be interpreted as sound pressure level. Also, the electrical power of the wind turbine should be corrected for the high wind case to 660 kW.
arxiv +1 more source
Spectral integration of infrasound at threshold [PDF]
The Journal of the Acoustical Society of America, 2020 The present study investigated the effect of the number of spectral components on the threshold in quiet of infrasound stimuli. Stimuli with one, two, or three sinusoidal components were presented monaurally to the ear with a low-distortion infrasound reproduction system.
Jesko L. Verhey +3 more
openaire +3 more sources
Acoustic Rocket Signatures Collected by Smartphones
SignalsRockets generate complex acoustic signatures that can be detected over a thousand kilometers from their source. While many far-field acoustic rocket signatures have been collected and released to the public, very few signatures collected at distances ...
Sarah K. Popenhagen, Milton A. Garcés
doaj +1 more source