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  2. Femtosecond - Wikipedia

    en.wikipedia.org/wiki/Femtosecond

    Because the next higher SI unit is 1000 times larger, times of 10 −14 and 10 −13 seconds are typically expressed as tens or hundreds of femtoseconds. Typical time steps for molecular dynamics simulations are on the order of 1 fs. [4] The periods of the waves of visible light have a duration of about 2 femtoseconds.

  3. Speed of light - Wikipedia

    en.wikipedia.org/wiki/Speed_of_Light

    In the 19th century Hippolyte Fizeau developed a method to determine the speed of light based on time-of-flight measurements on Earth and reported a value of 315 000 km/s. [146] His method was improved upon by Léon Foucault who obtained a value of 298 000 km/s in 1862. [ 105 ]

  4. Aircraft dynamic modes - Wikipedia

    en.wikipedia.org/wiki/Aircraft_dynamic_modes

    The motion is a rapid pitching of the aircraft about the center of gravity, essentially an angle-of-attack variation. The short-period mode is an oscillation with a period of only a few seconds that is usually heavily damped by the existence of lifting surfaces far from the aircraft’s center of gravity, such as a horizontal tail or canard.

  5. Ultrashort pulse - Wikipedia

    en.wikipedia.org/wiki/Ultrashort_pulse

    A positively chirped ultrashort pulse of light in the time domain. There is no standard definition of ultrashort pulse. Usually the attribute 'ultrashort' applies to pulses with a duration of a few tens of femtoseconds, but in a larger sense any pulse which lasts less than a few picoseconds can be considered ultrashort.

  6. Speed to fly - Wikipedia

    en.wikipedia.org/wiki/Speed_to_fly

    The speed to fly is the optimum speed through sinking or rising air mass to achieve either the furthest glide, or fastest average cross-country speed. [1] Most speed to fly setups use units of either airspeed in kilometers per hour (km/h) and climb rate in meters per second (m/s), or airspeed in knots (kn) and climb rate in feet per minute (ft ...

  7. Flight-time equivalent dose - Wikipedia

    en.wikipedia.org/wiki/Flight-time_equivalent_dose

    The flight-time equivalent dose concept is the creation of Ulf Stahmer, a Canadian professional engineer working in the field of radioactive materials transport. It was first presented in the poster session [1] at the 18th International Symposium of the Packaging and Transport of Radioactive Materials (PATRAM) held in Kobe, Hyogo, Japan where the poster received an Aoki Award for distinguished ...

  8. Doomsday clock ticks down, closest ever to "global catastrophe"

    www.aol.com/doomsday-clock-ticks-down-closest...

    The Doomsday clock was set at 89 seconds to midnight on Tuesday morning, putting it the closest the world has ever been to what scientists deem "global catastrophe."

  9. Formation flying - Wikipedia

    en.wikipedia.org/wiki/Formation_flying

    United States Air Force F-15C Eagles flying in a Vic formation over Alaska. Formation flying is the flight of multiple objects in coordination. Formation flying occurs in nature among flying and gliding animals, and is also conducted in human aviation, often in military aviation and air shows.

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