Results 281 to 290 of about 7,623,084 (334)
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The ‘acoustic scallop’: a bubble-powered actuator
Journal of Micromechanics and Microengineering, 2006The device described here consists of a millimeter-size tube immersed in a liquid, closed at one end, and partially filled with gas. A sound field in the liquid causes the gas volume to pulsate alternately expelling and drawing liquid through the open end of the tube. According to general fluid mechanical principles, the liquid exits the tube as a jet,
Dijkink, R.J. +3 more
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, 2020
Energy harvesting technology of converting ambient mechanical energies such as wind and acoustic wave into electricity is regarded as a potential solution for the sustainable development of society.
Feiyu Wang +9 more
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Energy harvesting technology of converting ambient mechanical energies such as wind and acoustic wave into electricity is regarded as a potential solution for the sustainable development of society.
Feiyu Wang +9 more
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Power-Aware Acoustic Processing
2003We investigated tradeoffs between accuracy and battery-energy longevity of acoustic beamforming on disposable sensor nodes subject to varying key parameters: number of microphones, duration of sampling, number of search angles, and CPU clock. Beyond finding the most energy efficient implementation of the beamforming algorithm at a specified accuracy ...
Ronald Riley +3 more
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An acoustic power measuring device
Journal of Physics E: Scientific Instruments, 1968The total acoustic power radiated by a source is measured by integration of the square of the sound pressure over the surface of a sphere which is concentric with the source and has its surface in the far acoustic field. The squaring device is a Hall effect multiplier and the integrator is a high gain d.c. amplifier with capacitive feedback. Details of
C J Moore, A J Ellison
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The Journal of the Acoustical Society of America, 1985
There is disclosed herein an acoustic or ultrasonic power meter which includes a liquid crystal cell for detecting acoustic energy and a control circuit for applying an electric field to said cell. The liquid crystal cell includes a liquid crystal material having elongated molecules. The preferred liquid crystal is in the form of a layer of the nematic
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There is disclosed herein an acoustic or ultrasonic power meter which includes a liquid crystal cell for detecting acoustic energy and a control circuit for applying an electric field to said cell. The liquid crystal cell includes a liquid crystal material having elongated molecules. The preferred liquid crystal is in the form of a layer of the nematic
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Nano Energy, 2019
Development of flexible, durable and biocompatible piezoelectric/acoustic/wind multi-functional energy harvester with remarkable energy conversion efficiency, high current, and power density is of great challenge in scavenging electricity from multi ...
S. K. Karan +11 more
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Development of flexible, durable and biocompatible piezoelectric/acoustic/wind multi-functional energy harvester with remarkable energy conversion efficiency, high current, and power density is of great challenge in scavenging electricity from multi ...
S. K. Karan +11 more
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ACS Applied Materials and Interfaces, 2023
As a clean, sustainable energy source, sound can carry a wealth of information and play a huge role in the Internet of Things era. In recent years, triboelectric acoustic sensors have received increasing attention due to the advantages of self-power ...
Changheng Li +5 more
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As a clean, sustainable energy source, sound can carry a wealth of information and play a huge role in the Internet of Things era. In recent years, triboelectric acoustic sensors have received increasing attention due to the advantages of self-power ...
Changheng Li +5 more
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, 2020
This paper presents the design and analysis of a Langevin Ultrasonic Transducer for Acoustic Cavitation Generation (LUTACG) operating under acoustic load.
A. Pérez‐Sánchez +4 more
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This paper presents the design and analysis of a Langevin Ultrasonic Transducer for Acoustic Cavitation Generation (LUTACG) operating under acoustic load.
A. Pérez‐Sánchez +4 more
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Localization and Quantification of the Acoustical power of Lightning Flashes
Proceedings of the 10th Convention of the European Acoustics Association Forum Acusticum 2023, 2022Lightning is an ubiquitous source of infrasound, and an essential climate variable. To observe lightning flashes, thunder measurement efficiently complements electromagnetic methods. 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 ...
Damien Bestard +2 more
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Nature, 1974
THE range and sensitivity of turbulence detection by acoustic probing of the lower atmosphere initiated by McAllister et al.1 has in part been restricted by the use of low power acoustic pulses (generally ∼ 100 W). We shall briefly describe a pulsed high power (8.1 kW input) sound radar system and present representative data obtained with a 2.7 kW ...
I. A. BOURNE, T. D. KEENAN
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THE range and sensitivity of turbulence detection by acoustic probing of the lower atmosphere initiated by McAllister et al.1 has in part been restricted by the use of low power acoustic pulses (generally ∼ 100 W). We shall briefly describe a pulsed high power (8.1 kW input) sound radar system and present representative data obtained with a 2.7 kW ...
I. A. BOURNE, T. D. KEENAN
openaire +1 more source