Results 11 to 20 of about 434,289 (296)
Nanogenerator for determination of acoustic power in ultrasonic reactors. [PDF]
Ultrason Sonochem, 2021 Mistewicz K +6 more
europepmc +2 more sources
Engineering Transactions, 2023 Graphite-epoxy composites have been able to meet the multiple requirements of the space industry. However, the radiation from the spatial environment and non-perfect adhesion between the fibers and the matrix can lead to the appearance of imperfections ...
Ismaine ZITOUNI +2 more
doaj +1 more source
Acoustic Wake-Up Technology for Microsystems: A Review
Micromachines, 2023 Microsystems with capabilities of acoustic signal perception and recognition are widely used in unattended monitoring applications. In order to realize long-term and large-scale monitoring, microsystems with ultra-low power consumption are always ...
Deng Yang, Jiahao Zhao
doaj +1 more source
Acoustical Power of Lightning Flashes
Journal of Geophysical Research: Atmospheres, 2023 AbstractLightning is a ubiquitous source of infrasound. To study lightning flashes, thunder measurement efficiently complements electromagnetic observation. Using acoustical arrays, time delays between sensors inform on the direction of sound arrival, while the difference between emission time and sound arrival provides the source distance.
Bestard, Damien +3 more
openaire +1 more source
Power considerations in acoustic emission [PDF]
The Journal of the Acoustical Society of America, 1995 In stochastic acoustic emission, both theory and experiments suggest that the power of the acoustic emission signal is proportional to the source energy. Hence, inference about the power is equivalent to inference about the source energy except for a constant multiple.
John T. Barnett +2 more
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The Journal of the Acoustical Society of America, 1981 Recently Morfey and Howell (AIAA Paper 79-0595) have shown that the acoustic power emitted by jets does not appear to be in agreement with Lighthill's U8 scaling law. In the present investigation it is argued that source convection is the principal mechanism leading to a departure from the U8 law (unheated jets only).
Werner G. Richarz, Stephen Keith
openaire +1 more source
High-power acoustic transmitter arrays [PDF]
The Journal of the Acoustical Society of America, 1975 A high-power acoustic transmitter with design goals of producing a narrow bean (≈5° half angle to 3-dB points), minimum side lobes (40 to 50 dB down) and high acoustic power (≈500 acoustic watts) was producted by NOAA's Wave Propagation Laboratories for use in the FAA sponsored wind shear measuring system.
Tant Priestley, Del Hunter
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Acoustic power measurements of oscillating flames [PDF]
, 1981 The acoustic power of an oscillating flame is measured. A turbulent premixed propane/air flame is situated near a pressure antinode of a standing wave in a laboratory combustion chamber. This standing wave is generated by a piston.
Valk, M.
core +3 more sources
Algorithm for diagnosing insulation of power transformers by acoustic method in conditions of temperature changes [PDF]
Омский научный вестник, 2022 The article presents an algorithm for processing data by the acoustic method of insulation power transformers. The article presents data processing of diagnosing by the acoustic method of power transformers.
A. A. Kuznetsov +2 more
doaj +1 more source
Research on data diagnosis method of acoustic array sensor device based on spectrogram
Global Energy Interconnection, 2022 Acoustic array sensor device for partial discharge detection is widely used in power equipment inspection with the advantages of non-contact and precise positioning compared with partial discharge detection methods such as ultrasonic method and pulse ...
Xing Lei +5 more
doaj +1 more source