ultrasound wikipedia - EAS
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Xem tất cả trên WikipediaUltrasound - Wikipedia
https://en.wikipedia.org/wiki/UltrasoundUltrasound is sound waves with frequencies higher than the upper audible limit of human hearing. Ultrasound is not different from "normal" (audible) sound in its physical properties, except that humans cannot hear it. This limit varies from person to person and is approximately 20 kilohertz
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Xem thêmAcoustics, the science of sound, starts as far back as Pythagoras in the 6th century BC, who wrote on the mathematical properties of stringed instruments. Echolocation in bats was discovered by Lazzaro Spallanzaniin
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Ultrasound is defined by the American National Standards Institute as "sound at frequencies greater than 20 kHz". In air at atmospheric pressure, ultrasonic waves have
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Xem thêmHumans
The upper frequency limit in humans (approximately 20 kHz) is due to limitations of the middle ear. Auditory sensationcan...
Xem thêmThe potential for ultrasonic imaging of objects, with a 3 GHz sound wave producing resolution comparable to an optical image, was
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Xem thêmAcoustic microscopyis the technique of using sound waves to visualize structures too small to be resolved by the human eye. Frequencies up to several
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Xem thêmHigh-power applications of ultrasound often use frequencies between 20 kHz and a few hundred kHz. Intensities can be very high; above 10 watts per
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Xem thêmNon-contact sensor
An ultrasonic level or sensing system requires no contact with the target. For many processes in the medical, pharmaceutical, military and general industries this is an advantage over inline sensors that may...
Xem thêmVăn bản Wikipedia theo giấy phép CC-BY-SAMục này có hữu ích không?Cảm ơn! Cung cấp thêm phản hồiSiêu âm – Wikipedia tiếng Việt
https://vi.wikipedia.org/wiki/Siêu_âmGuidelines for the Safe Use of Ultrasound Lưu trữ 2013-01-10 tại Wayback Machine: valuable insight on the boundary conditions tending towards abuse of ultrasound. Grzesik, J.; Pluta, E. (1983). “High-frequency hearing risk of operators of industrial ultrasonic devices”. International Archives of Occupational and Environmental Health.
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Ultrasound - Simple English Wikipedia, the free encyclopedia
https://simple.wikipedia.org/wiki/UltrasoundUltrasound is a type of sound with a frequency higher than humans can hear. This frequency, the upper limit of human hearing, is approximately 20,000 hertz (20 kilohertz).. Hearing ultrasound. Some animals, such as dogs, dolphins, bats, and mice, are able to hear sounds which have a frequency higher than upper-limit of the human ear.This makes them able to hear ultrasounds.
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Ultrasound — Wikipédia
https://fr.wikipedia.org/wiki/UltrasoundUltrasound est un film de science-fiction américain réalisé par Rob Schroeder et sorti en 2021 [1. Synopsis. Après que sa voiture tombe en panne, Glen va passer une nuit étrange avec un couple marié, qui va mettre en mouvement une chaîne d’événements qui va modifier sa vie et celle de plusieurs autres inconnus. ...
- Réalisation: Rob Schroeder
- Pays d’origine: États-Unis
- Scénario: Conor Stechschulte
Ultrasound – Wikipedia
https://de.wikipedia.org/wiki/UltrasoundBei Ultrasound handelt es sich um das Regiedebüt bei einem Spielfilm von Rob Schroeder. Das Drehbuch schrieb Conor Stechschulte . Die Weltpremiere erfolgte am 15. Juni 2021 beim Tribeca Film Festival. Im August 2021 wird der Film beim Fantasia International Film Festival vorgestellt.
Ultrasuoni - Wikipedia
https://it.wikipedia.org/wiki/Ultrasuoni- Nonostante, come detto, l'essere umano non sia in grado di udire gli ultrasuoni, altri animali hanno tale capacità: 1. i cani(per i quali sono in commercio appositi fischietti di richiamo agli ultrasuoni); 2. i delfini e le baleneche li usano per comunicare tra loro; 3. i pipistrelli che li usano per captare gli ostacoli mentre volano di notte e gli animali murini, ad esempio topi e ratti per i …
