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  2. Level crossing signals - Wikipedia

    en.wikipedia.org/wiki/Level_crossing_signals

    The basic signal consists of flashing red lights, a crossbuck and an alarm (either a bell, a speaker that mimics a bell sound or an electronic siren), attached to a mast. At most crossings, the signals will activate about 30 seconds before the train arrives but there are sensors measuring speed so that the crossing knows when to activate; so ...

  3. Xbox 360 technical problems - Wikipedia

    en.wikipedia.org/wiki/Xbox_360_technical_problems

    Disc that has been scratched by the Xbox 360 console. Almost at the same time the Xbox 360 was released in late 2005, customers began reporting circumferential scratches found on discs used in their Xbox 360 consoles.

  4. Quantum error correction - Wikipedia

    en.wikipedia.org/wiki/Quantum_error_correction

    In general, a quantum code for a quantum channel is a subspace , where is the state Hilbert space, such that there exists another quantum channel with () = =, where is the orthogonal projection onto .

  5. Multiservice tactical brevity code - Wikipedia

    en.wikipedia.org/wiki/Multiservice_tactical...

    Gate Directive/informative call to fly as quickly as possible, using afterburner/maximum power. Gimbal Radar target is approaching azimuth or elevation limits. (Direction) Gingerbread Directive to establish/maintain tighter brevity over voice communications. Glowworm Flare-dropping aircraft Go active

  6. Troubleshooting - Wikipedia

    en.wikipedia.org/wiki/Troubleshooting

    Troubleshooting is a form of problem solving, often applied to repair failed products or processes on a machine or a system. It is a logical, systematic search for the source of a problem in order to solve it, and make the product or process operational again.

  7. Logic gate - Wikipedia

    en.wikipedia.org/wiki/Logic_gate

    A logic gate is a device that performs a Boolean function, a logical operation performed on one or more binary inputs that produces a single binary output. Depending on the context, the term may refer to an ideal logic gate , one that has, for instance, zero rise time and unlimited fan-out , or it may refer to a non-ideal physical device [ 1 ...

  8. NOR gate - Wikipedia

    en.wikipedia.org/wiki/NOR_gate

    The NOR gate is a digital logic gate that implements logical NOR - it behaves according to the truth table to the right. A HIGH output (1) results if both the inputs to the gate are LOW (0); if one or both input is HIGH (1), a LOW output (0) results. NOR is the result of the negation of the OR operator.

  9. Alenia C-27J Spartan - Wikipedia

    en.wikipedia.org/wiki/Alenia_C-27J_Spartan

    The Alenia C-27J Spartan [3] is a military transport aircraft developed and manufactured by Leonardo's Aircraft Division (formerly Alenia Aermacchi until 2016). [4] It is an advanced derivative of the former Alenia Aeronautica's earlier G.222 (C-27A Spartan in U.S. service), equipped with the engines and various other systems also used on the larger Lockheed Martin C-130J Super Hercules.