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  2. Drowning detection system - Wikipedia

    en.wikipedia.org/wiki/Drowning_detection_system

    Drowning detection systems are systems designed to improve safety by reducing drowning deaths [1] and injuries in public and private pools, [2] waterparks, thermal baths, [3] spa facilities, beaches, or other natural bodies of water smart beach.

  3. Iron (II) sulfate - Wikipedia

    en.wikipedia.org/wiki/Iron(II)_sulfate

    Iron(II) sulfate (British English: iron(II) sulphate) or ferrous sulfate denotes a range of salts with the formula Fe SO 4 ·xH 2 O. These compounds exist most commonly as the heptahydrate (x = 7) but several values for x are known. The hydrated form is used medically to treat or prevent iron deficiency, and also for industrial applications.

  4. Pyrite - Wikipedia

    en.wikipedia.org/wiki/Pyrite

    Pyrite detectors can be as sensitive as a modern 1N34A germanium diode detector. [23] [24] Pyrite has been proposed as an abundant, non-toxic, inexpensive material in low-cost photovoltaic solar panels. [25] Synthetic iron sulfide was used with copper sulfide to create the photovoltaic material. [26]

  5. Water detector - Wikipedia

    en.wikipedia.org/wiki/Water_detector

    A water detector is an electronic device that is designed to detect the presence of water for purposes such as to provide an alert in time to allow the prevention of water leakage. A common design is a small cable or device that lies flat on a floor and relies on the electrical conductivity of water to decrease the resistance across two contacts.

  6. Iron sulfate - Wikipedia

    en.wikipedia.org/wiki/Iron_sulfate

    Iron sulfate may refer to: Ferrous sulfate, Iron(II) sulfate, FeSO 4; Ferric sulfate, Iron(III) sulfate, Fe 2 (SO 4) 3 This page was last edited on 27 ...

  7. Cost Of Adding Metal Detectors To Subway Stations In NYC - AOL

    www.aol.com/cost-adding-metal-detectors-subway...

    So, what would it cost to add metal detectors? Each metal detecting machine costs about $2,200, and the city would need four turnstiles per station. That adds up to $8,800.

  8. Iron fertilization - Wikipedia

    en.wikipedia.org/wiki/Iron_fertilization

    Iron fertilization is the intentional introduction of iron-containing compounds (like iron sulfate) to iron-poor areas of the ocean surface to stimulate phytoplankton production. This is intended to enhance biological productivity and/or accelerate carbon dioxide (CO 2 ) sequestration from the atmosphere.

  9. Iron(III) sulfate - Wikipedia

    en.wikipedia.org/wiki/Iron(III)_sulfate

    Iron sulfates occur as a variety of rare (commercially unimportant) minerals. Mikasaite, a mixed iron-aluminium sulfate of chemical formula (Fe 3+, Al 3+) 2 (SO 4) 3 [6] is the name of mineralogical form of iron(III) sulfate. This anhydrous form occurs very rarely and is connected with coal fires.

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