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  2. Electromagnetic lock - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_lock

    The principle behind an electromagnetic lock is the use of electromagnetism to lock a door when energized. The holding force should be collinear with the load, and the lock and armature plate should be face-to-face to achieve optimal operation. The magnetic lock relies upon some of the basic concepts of electromagnetism.

  3. Platform screen doors - Wikipedia

    en.wikipedia.org/wiki/Platform_screen_doors

    Platform screen doors (PSDs), ... [30] In 2020, rope-type screen door (RSD) ... [72] As of November 2012, only 34 of 235 stations with over 100,000 users per day were ...

  4. Window screen - Wikipedia

    en.wikipedia.org/wiki/Window_screen

    The screen may also include a crossbar for added strength. Fiberglass screen material is typically available in 30 m (100 ft) rolls in varying widths, from 46 to 305 cm (18 to 120 in) wide. Aluminum screen material is available in 30 m (100 ft) rolls except the range of available widths is less than for the more commonly used fiberglass.

  5. Magnetic field - Wikipedia

    en.wikipedia.org/wiki/Magnetic_field

    The magnetic pole model predicts correctly the field H both inside and outside magnetic materials, in particular the fact that H is opposite to the magnetization field M inside a permanent magnet. Since it is based on the fictitious idea of a magnetic charge density, the pole model has limitations. Magnetic poles cannot exist apart from each ...

  6. Electromagnetic pulse - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_pulse

    An electromagnetic pulse (EMP), also referred to as a transient electromagnetic disturbance (TED), is a brief burst of electromagnetic energy. The origin of an EMP can be natural or artificial, and can occur as an electromagnetic field, as an electric field, as a magnetic field, or as a conducted electric current.

  7. Maglev - Wikipedia

    en.wikipedia.org/wiki/Maglev

    Transrapid 09 at the Emsland test facility in Lower Saxony, Germany A full trip on the Shanghai Transrapid maglev train Example of low-speed urban maglev system, Linimo. Maglev (derived from magnetic levitation) is a system of rail transport whose rolling stock is levitated by electromagnets rather than rolled on wheels, eliminating rolling resistance.