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  2. Ecolab - Wikipedia

    en.wikipedia.org/wiki/Ecolab

    Ecolab Inc. is an American corporation headquartered in Saint Paul, Minnesota. It develops and offers services, technology and systems that specialize in treatment, purification, cleaning and hygiene of water in a wide variety of applications. [2] Founded as Economics Laboratory in 1923 by Merritt J. Osborn, it was eventually renamed "Ecolab ...

  3. Echocardiography - Wikipedia

    en.wikipedia.org/wiki/Echocardiography

    Echocardiography, also known as cardiac ultrasound, is the use of ultrasound to examine the heart. It is a type of medical imaging, using standard ultrasound or Doppler ultrasound. [ 1] The visual image formed using this technique is called an echocardiogram, a cardiac echo, or simply an echo . Echocardiography is routinely used in the ...

  4. Echo sounding - Wikipedia

    en.wikipedia.org/wiki/Echo_sounding

    Echo sounding or depth sounding is the use of sonar for ranging, normally to determine the depth of water . It involves transmitting acoustic waves into water and recording the time interval between emission and return of a pulse; the resulting time of flight , along with knowledge of the speed of sound in water, allows determining the distance ...

  5. Ultrasound - Wikipedia

    en.wikipedia.org/wiki/Ultrasound

    Ultrasound. An ultrasonic examination. Ultrasound is sound with frequencies greater than 20 kilohertz. [ 1] This frequency is the approximate upper audible limit of human hearing in healthy young adults. The physical principles of acoustic waves apply to any frequency range, including ultrasound. Ultrasonic devices operate with frequencies from ...

  6. Functions of Teacher Echoing in an EFL Class Delivered via

    files.eric.ed.gov/fulltext/ED624428.pdf

    where all the classes were held via an application allowing synchronous online teaching. In order to ensure reliability of the functions identified by the researcher, the researcher invited a second-rater to analyse the functions of teacher echo detected in the data set. Since there were

  7. Linear alkylbenzene - Wikipedia

    en.wikipedia.org/wiki/Linear_alkylbenzene

    Linear alkylbenzenes (sometimes also known as LAB s) are a family of organic compounds with the formula C 6 H 5 C n H 2n+1. Typically, n lies between 10 and 16, although generally supplied as a tighter cut, such as C 12 -C 15, C 12 -C 13 and C 10 -C 13, for detergent use. [ 1] The C n H 2n+1 chain is unbranched.

  8. Doppler echocardiography - Wikipedia

    en.wikipedia.org/wiki/Doppler_echocardiography

    OPS-301 code. 3-052. [ edit on Wikidata] Doppler echocardiography is a procedure that uses Doppler ultrasonography to examine the heart. [ 1] An echocardiogram uses high frequency sound waves to create an image of the heart while the use of Doppler technology allows determination of the speed and direction of blood flow by utilizing the Doppler ...

  9. Echo suppression and cancellation - Wikipedia

    en.wikipedia.org/wiki/Echo_suppression_and...

    Echo suppression and echo cancellation are methods used in telephony to improve voice quality by preventing echo from being created or removing it after it is already present. In addition to improving subjective audio quality, echo suppression increases the capacity achieved through silence suppression by preventing echo from traveling across a ...

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