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  2. Garage door opener - Wikipedia

    en.wikipedia.org/wiki/Garage_door_opener

    The electric overhead garage door opener was invented by C.G. Johnson in 1926 in Hartford City, Indiana. [1] Electric Garage Door openers did not become popular until Era Meter Company of Chicago offered one after World War II where the overhead garage door could be opened via a key pad located on a post at the end of the driveway or a switch inside the garage.

  3. Bedford QL - Wikipedia

    en.wikipedia.org/wiki/Bedford_QL

    As a 'plan B' Vauxhall adapted a Bedford GL by mounting its engine, cab and gearbox on an elevated girder frame some seven feet high, with a chain drive transmitting power to the propshaft. The ungainly but effective vehicle demonstrated it was a viable solution should hastily extemporised waterproofing kits fail but they proved effective and ...

  4. Video tape tracking - Wikipedia

    en.wikipedia.org/wiki/Video_tape_tracking

    In the case of VHS, a linear control track at the tape's lower edge holds pulses that mark the beginning of every frame of video; these are used to fine-tune the tape speed during playback and to get the rotating heads exactly on their helical tracks rather than having them end up somewhere between two adjacent tracks. However, the exact ...

  5. Q factor - Wikipedia

    en.wikipedia.org/wiki/Q_factor

    The Q factor is a parameter that describes the resonance behavior of an underdamped harmonic oscillator (resonator). Sinusoidally driven resonators having higher Q factors resonate with greater amplitudes (at the resonant frequency) but have a smaller range of frequencies around that frequency for which they resonate; the range of frequencies for which the oscillator resonates is called the ...

  6. Mercedes-Benz GLE - Wikipedia

    en.wikipedia.org/wiki/Mercedes-Benz_GLE

    The GLE name was used in 2015 for the facelifted W166 [38] along with the new five-door coupé derivative GLE Coupé (C292) which was unveiled to the public in January 2015 at the North American International Auto Show. As part of Mercedes-Benz's new naming strategy, the GLE will define the SUV's positioning in the middle of its segment and ...

  7. Track transition curve - Wikipedia

    en.wikipedia.org/wiki/Track_transition_curve

    The Euler spiral provides the shortest transition subject to a given limit on the rate of change of the track superelevation (i.e. the twist of the track). However, as has been recognized for a long time, it has undesirable dynamic characteristics due to the large (conceptually infinite) roll acceleration and rate of change of centripetal ...

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