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  2. QR code - Wikipedia

    en.wikipedia.org/wiki/QR_Code

    The QR code system was invented in 1994, at the Denso Wave automotive products company, in Japan. [5] [6] [7] The initial alternating-square design presented by the team of researchers, headed by Masahiro Hara, was influenced by the black counters and the white counters played on a Go board; [8] the pattern of position detection was found and determined by applying the least-used ratio (1:1:3 ...

  3. McDonnell Douglas KC-10 Extender - Wikipedia

    en.wikipedia.org/wiki/McDonnell_Douglas_KC-10...

    The McDonnell Douglas KC-10 Extender is an American tanker and cargo aircraft that was [citation needed] operated by the United States Air Force (USAF). A military version of the three-engine DC-10 airliner, the KC-10 was developed from the Advanced Tanker Cargo Aircraft Program.

  4. 50% - Wikipedia

    en.wikipedia.org/wiki/50%

    50% may refer to: One half, an irreducible fraction "50%", a 2006 song by Grandaddy from Just Like the Fambly Cat; See also. 50% & 50%", a 1993 song by Hide; Middle 50% or interquartile range, a measure of statistical dispersion

  5. Influenza vaccine - Wikipedia

    en.wikipedia.org/wiki/Influenza_vaccine

    The live, weakened vaccine is generally not recommended in pregnant women, children less than two years old, adults older than 50, or people with a weakened immune system. [14] Depending on the type it can be injected into a muscle (intramuscular) , sprayed into the nose (intranasal), or injected into the middle layer of the skin (intradermal ...

  6. Lockheed SR-71 Blackbird - Wikipedia

    en.wikipedia.org/wiki/Lockheed_SR-71_Blackbird

    On a typical mission, the SR-71 took off with only a partial fuel load to reduce stress on the brakes and tires during takeoff and also ensure it could successfully take off should one engine fail. [86] Within 20 seconds the aircraft traveled 4,500 feet (1,400 m), reached 240 miles per hour (390 km/h), and lifted off.

  7. Raised-cosine filter - Wikipedia

    en.wikipedia.org/wiki/Raised-cosine_filter

    The raised-cosine filter is a filter frequently used for pulse-shaping in digital modulation due to its ability to minimise intersymbol interference (ISI). Its name stems from the fact that the non-zero portion of the frequency spectrum of its simplest form (=) is a cosine function, 'raised' up to sit above the (horizontal) axis.