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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. United States fifty-dollar bill - Wikipedia

    en.wikipedia.org/wiki/United_States_fifty-dollar...

    All current-issue $50 bills are Federal Reserve Notes. As of December 2018, the average life of a $50 bill in circulation is 12.2 years before it is replaced due to wear. [2] Approximately 3.5% of all notes printed in 2019 were $50 bills. [3] They are delivered by Federal Reserve Banks in beige straps.

  4. Gray code - Wikipedia

    en.wikipedia.org/wiki/Gray_code

    One such type of Gray code is the n-ary Gray code, also known as a non-Boolean Gray code. As the name implies, this type of Gray code uses non-Boolean values in its encodings. For example, a 3-ary Gray code would use the values 0,1,2. [31] The (n, k)-Gray code is the n-ary Gray code with k digits. [63]

  5. The best Labor Day sales to shop at Amazon today: Get a Fire ...

    www.aol.com/lifestyle/the-best-labor-day-sales...

    Save $17 with coupon and code. ... Choose from 21 different colors, enough to match just about any autumnal outfit. Save $13 with coupon. ... (50% off). $36 at Amazon.

  6. 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.

  7. Median lethal dose - Wikipedia

    en.wikipedia.org/wiki/Median_lethal_dose

    In toxicology, the median lethal dose, LD 50 (abbreviation for "lethal dose, 50%"), LC 50 (lethal concentration, 50%) or LCt 50 is a toxic unit that measures the lethal dose of a given substance. [1] The value of LD 50 for a substance is the dose required to kill half the members of a tested population after a specified test duration.

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