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  2. Deepwater Horizon oil spill - Wikipedia

    en.wikipedia.org/wiki/Deepwater_Horizon_oil_spill

    Location: Macondo Prospect (Mississippi Canyon Block 252), in the North-central Gulf of Mexico, United States (south of Louisiana): Coordinates: 1]: Date: 20 April – 19 September 2010 (4 months, 4 weeks and 2 days): Cause; Cause: Wellhead blowout: Casualties: 11 people killed 17 people injured: Operator: Transocean under contract for BP [2]: Spill characteristics; Volume: 4.9 MMbbl ...

  3. Pareto principle - Wikipedia

    en.wikipedia.org/wiki/Pareto_principle

    The Pareto principle may apply to fundraising, i.e. 20% of the donors contributing towards 80% of the total. The Pareto principle (also known as the 80/20 rule, the law of the vital few and the principle of factor sparsity [1] [2]) states that for many outcomes, roughly 80% of consequences come from 20% of causes (the "vital few").

  4. Polytetrafluoroethylene - Wikipedia

    en.wikipedia.org/wiki/Polytetrafluoroethylene

    PTFE is a thermoplastic polymer, which is a white solid at room temperature, with a density of about 2200 kg/m 3 and a melting point of 600 K (327 °C; 620 °F). [20] It maintains high strength, toughness and self-lubrication at low temperatures down to 5 K (−268.2 °C; −450.7 °F), and good flexibility at temperatures above 194 K (−79.15 ...

  5. Gray card - Wikipedia

    en.wikipedia.org/wiki/Gray_card

    A primary use of gray cards is to provide a standard reference object for exposure determination in photography. A gray card is an (approximate) realization of a Lambertian scatterer; its apparent brightness (and exposure determination) therefore depends only on its orientation relative to the light source.

  6. Gate turn-off thyristor - Wikipedia

    en.wikipedia.org/wiki/Gate_turn-off_thyristor

    A distributed buffer gate turn-off thyristor (DB-GTO) is a thyristor with additional PN layers in the drift region to reshape the field profile and increase the voltage blocked in the off state. Compared to a typical PNPN structure of a conventional thyristor, the DB-GTO thyristor has a PN–PN–PN structure.

  7. American Express - Wikipedia

    en.wikipedia.org/wiki/American_Express

    Share of the American Express Company, 1865. In 1850, American Express was started as a freight forwarding company in Buffalo, New York. [13] It was founded as a joint-stock corporation by the merger of the cash-in-transit companies owned by Henry Wells (Wells & Company), William G. Fargo (Livingston, Fargo & Company), and John Warren Butterfield (Wells, Butterfield & Company, the successor ...

  8. Firefox - Wikipedia

    en.wikipedia.org/wiki/Firefox

    It was released on November 9, 2004, [19] and challenged Internet Explorer's dominance with 60 million downloads within nine months. [20] In November 2017, Firefox began incorporating new technology under the code name " Quantum " to promote parallelism and a more intuitive user interface .

  9. Gas constant - Wikipedia

    en.wikipedia.org/wiki/Gas_constant

    When using the ISO value of R, the calculated pressure increases by only 0.62 pascal at 11 kilometres (the equivalent of a difference of only 17.4 centimetres or 6.8 inches) and 0.292 Pa at 20 km (the equivalent of a difference of only 33.8 cm or 13.2 in).

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