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  2. Terahertz spectroscopy and technology - Wikipedia

    en.wikipedia.org/wiki/Terahertz_spectroscopy_and...

    Terahertz spectroscopy detects and controls properties of matter with electromagnetic fields that are in the frequency range between a few hundred gigahertz and several terahertz (abbreviated as THz). In many-body systems, several of the relevant states have an energy difference that matches with the energy of a THz photon.

  3. Nephelometer - Wikipedia

    en.wikipedia.org/wiki/Nephelometer

    A nephelometer [1] or aerosol photometer [2] is an instrument for measuring the concentration of suspended particulates in a liquid or gas colloid. A nephelometer measures suspended particulates by employing a light beam (source beam) and a light detector set to one side (often 90°) of the source beam. Particle density is then a function of ...

  4. Electrical conductivity meter - Wikipedia

    en.wikipedia.org/wiki/Electrical_conductivity_meter

    An electrical conductivity meter. An electrical conductivity meter ( EC meter) measures the electrical conductivity in a solution. It has multiple applications in research and engineering, with common usage in hydroponics, aquaculture, aquaponics, and freshwater systems to monitor the amount of nutrients, salts or impurities in the water.

  5. Window detector - Wikipedia

    en.wikipedia.org/wiki/Window_detector

    Window detector. A window detector circuit, also called window comparator circuit or dual edge limit detector circuits is used to determine whether an unknown input is between two precise reference threshold voltages. [1] It employs two comparators to detect over-voltage or under-voltage. [2]

  6. AOL Mail

    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  7. Wikipedia, the free encyclopedia

    en.wikipedia.org/wiki/Main_Page

    The Symbolist painting is a stylised seascape, dominated by a bright sunburst breaking through clouds. Watts intended to evoke a monotheistic God in the act of creation, without depicting the Creator directly. The unfinished painting was exhibited at a church in Whitechapel in 1886, under the intentionally simplified title of The Sun.

  8. pH meter - Wikipedia

    en.wikipedia.org/wiki/PH_meter

    pH meter. Beckman Model M pH Meter, 1937 [1] Beckman model 72 pH meter, 1960. 781 pH/Ion Meter pH meter by Metrohm. A pH meter is a scientific instrument that measures the hydrogen-ion activity in water-based solutions, indicating its acidity or alkalinity expressed as pH. [2] The pH meter measures the difference in electrical potential between ...

  9. The Daily Show - Wikipedia

    en.wikipedia.org/wiki/The_Daily_Show

    The Nightly Show with Larry Wilmore. The Opposition with Jordan Klepper. The Daily Show ( TDS) is an American late-night talk and satirical news television program. It airs each Monday through Thursday on Comedy Central with release shortly after on Paramount+ of extended episodes.

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