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  2. Calender - Wikipedia

    en.wikipedia.org/wiki/Calender

    A calender is a series of hard pressure rollers used to finish or smooth a sheet of material such as paper, textiles, rubber, or plastics. Calender rolls are also used to form some types of plastic films and to apply coatings. [1] Some calender rolls are heated or cooled as needed. [2] Calenders are sometimes misspelled calendars.

  3. Vinyl cutter - Wikipedia

    en.wikipedia.org/wiki/Vinyl_cutter

    Vinyl cutter. A vinyl cutter is an entry-level machine for making signs. Computer-designed vector files with patterns and letters are directly cut on the roll of vinyl which is mounted and fed into the vinyl cutter through USB or serial cable. Vinyl cutters are mainly used to make signs, banners and advertisements.

  4. Electrical steel - Wikipedia

    en.wikipedia.org/wiki/Electrical_steel

    It is an iron alloy with silicon as the main additive element (instead of carbon). The exact formulation is tailored to produce specific magnetic properties: small hysteresis area resulting in low power loss per cycle, low core loss, and high permeability. Electrical steel is usually manufactured in cold-rolled strips less than 2 mm thick.

  5. Permeability (electromagnetism) - Wikipedia

    en.wikipedia.org/wiki/Permeability...

    Scientists. v. t. e. In electromagnetism, permeability is the measure of magnetization produced in a material in response to an applied magnetic field. Permeability is typically represented by the (italicized) Greek letter μ. It is the ratio of the magnetic induction to the magnetizing field as a function of the field in a material.

  6. Aluminium foil - Wikipedia

    en.wikipedia.org/wiki/Aluminium_foil

    Although aluminium is non-magnetic, it is a good conductor, so even a thin sheet reflects almost all of an incident electric wave. At frequencies more than 100 MHz, the transmitted electric field is attenuated by more than 80 decibels (dB), that is less than 10 −8 = 0.00000001 of the power gets through.

  7. Aircraft compass turns - Wikipedia

    en.wikipedia.org/wiki/Aircraft_compass_turns

    A magnetic compass aboard an aircraft displays the current magnetic heading of the aircraft, i.e., the aircraft's directional orientation relative to the Earth's geomagnetic field, which has a roughly north-south orientation. The compass can be used in turns to verify the aircraft is travelling in the desired direction at the conclusion of a turn.

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