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  2. RF switch - Wikipedia

    en.wikipedia.org/wiki/RF_switch

    An RF switch or microwave switch is a device to route high frequency signals through transmission paths. RF (radio frequency) and microwave switches are used extensively in microwave test systems for signal routing between instruments and devices under test (DUT). Incorporating a switch into a switch matrix system enables you to route signals ...

  3. List of vacuum tubes - Wikipedia

    en.wikipedia.org/wiki/List_of_vacuum_tubes

    RSharp-cutoff tetrode or pentode; S – Tetrode with a space charge grid (the 2nd grid is the control grid) T – Gas-filled, grid-controlled; V – Variable-mu (remote-cutoff) tetrode and pentode; X – Other; Then a sequentially assigned number Then an optional letter: Version Examples: [31] 2N-H12 – Nuvistor; 2X-L2A – Low-mu triode ...

  4. Microwave oven - Wikipedia

    en.wikipedia.org/wiki/Microwave_oven

    It was almost 1.8 metres (5 ft 11 in) tall, weighed 340 kilograms (750 lb) and cost about US$5,000 ($68,000 in 2023 dollars) each. It consumed 3 kilowatts, about three times as much as today's microwave ovens, and was water-cooled. The name was the winning entry in an employee contest. [17]

  5. Nobel Prize controversies - Wikipedia

    en.wikipedia.org/wiki/Nobel_Prize_controversies

    The 1993 prize went to Phillip Allen Sharp and Richard J. Roberts "for their discoveries of split genes", the discovery of introns in eukaryotic DNA, and the mechanism of gene splicing. Several other scientists, such as Norman Davidson and James Watson , argued that Louise T. Chow , a China-born Taiwanese researcher [ 237 ] who collaborated ...

  6. Copper - Wikipedia

    en.wikipedia.org/wiki/Copper

    An estimated 80% of all copper ever mined is still in use today. [46] In volume, copper is the third most recycled metal after iron and aluminium. [47] As of 2023, recycled copper supplies about one-third of global demand. [48] The process of recycling copper is roughly the same as is used to extract copper but requires fewer steps.

  7. Roger Ebert - Wikipedia

    en.wikipedia.org/wiki/Roger_Ebert

    Roger Joseph Ebert (/ ˈ iː b ər t / EE-bərt; June 18, 1942 – April 4, 2013) was an American film critic, film historian, journalist, essayist, screenwriter and author.He was the film critic for the Chicago Sun-Times from 1967 until his death in 2013.