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  2. Secchi disk - Wikipedia

    en.wikipedia.org/wiki/Secchi_disk

    Secchi disk. The modified Secchi disk design used in fresh water. The Secchi disk (or Secchi disc), as created in 1865 by Angelo Secchi, is a plain white, circular disk 30 cm (12 in) in diameter used to measure water transparency or turbidity in bodies of water. The disc is mounted on a pole or line and lowered slowly down in the water.

  3. Angelo Secchi - Wikipedia

    en.wikipedia.org/wiki/Angelo_Secchi

    Angelo Secchi S.J. (Italian pronunciation: [ˈandʒelo ˈsekki]; 28 June 1818 – 26 February 1878) was an Italian Catholic priest and astronomer from the Italian region of Emilia. [1] He was director of the observatory at the Pontifical Gregorian University (then called the Roman College ) for 28 years.

  4. Secchi disk depth - Wikipedia

    en.wikipedia.org/?title=Secchi_disk_depth&...

    This page was last edited on 5 February 2006, at 01:00 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike License 4.0; additional terms may apply.

  5. Trophic state index - Wikipedia

    en.wikipedia.org/wiki/Trophic_state_index

    Lake George, New York, an oligotrophic lake. The Trophic State Index (TSI) is a classification system designed to rate water bodies based on the amount of biological productivity they sustain. [1] Although the term "trophic index" is commonly applied to lakes, any surface water body may be indexed. The TSI of a water body is rated on a scale ...

  6. Elevator algorithm - Wikipedia

    en.wikipedia.org/wiki/Elevator_algorithm

    The elevator algorithm, or SCAN, is a disk-scheduling algorithm to determine the motion of the disk's arm and head in servicing read and write requests.. This algorithm is named after the behavior of a building elevator, where the elevator continues to travel in its current direction (up or down) until empty, stopping only to let individuals off or to pick up new individuals heading in the ...

  7. Secchi (lunar crater) - Wikipedia

    en.wikipedia.org/wiki/Secchi_(lunar_crater)

    Secchi (lunar crater) / 2.4; 43.5. Secchi is a small lunar impact crater formation on the northwest edge of Mare Fecunditatis. It was named after the 19th-century Italian astronomer Angelo Secchi. [ 1] To the northeast is the crater Taruntius. The western rim is joined with a section of the minor Montes Secchi range.