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  2. Light-emitting diode - Wikipedia

    A light-emitting diode (LED) is a semiconductor device that emits light when current flows through it. Electrons in the semiconductor recombine with electron holes, releasing energy in the form of photons.

  3. List of airline codes - Wikipedia

    ASD Air Sinai: Egypt 4R SEK Star East Airline: Romania 4O AIJ Interjet: ABC Aerolineas Mexico Defunct in 2020 7A XRC Express Air Cargo: Tunisia 7B UBE Bees Airline: Flower Bee Ukraine Established 2019, started 2021. 7S RYA Ryan Air Services: RYAN AIR United States BRO 2Excel Aviation: BROADSWORD United Kingdom GBT A-Jet Aviation Aircraft ...

  4. Arthur Sullivan - Wikipedia

    Sullivan embarked on his composing career with a series of ambitious works, interspersed with hymns, parlour songs and other light pieces in a more commercial vein. His compositions were not enough to support him financially, and between 1861 and 1872 he worked as a church organist, which he enjoyed; as a music teacher, which he hated and gave up as soon as he could; and as an arranger of ...

  5. List of thermal conductivities - Wikipedia

    Sapphire values are taken from Kingery, W.D. and Norton, F.H., USAEC Rept. NYO-6447, 1-14, 1955, TPRC II pages 94, 96, curve 19 ref. 72 page 1160. Errata: The numbered references in the NSRDS-NBS-8 pdf are found near the end of the TPRC Data Book Volume 2 and not somewhere in Volume 3 like it says. Aluminium oxide, porous 22% Porosity 2.3