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2. 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.

3. 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 ...

4. Hydrochloric acid - Wikipedia

   en.wikipedia.org/wiki/Hydrochloric_acid

   Hydrochloric acid has been used for dissolving calcium carbonate, e.g. such things as de-scaling kettles and for cleaning mortar off brickwork. When used on brickwork the reaction with the mortar only continues until the acid has all been converted, producing calcium chloride , carbon dioxide , and water:

5. List of highest-grossing films - Wikipedia

   en.wikipedia.org/wiki/List_of_highest-grossing_films

   Three of the four highest-grossing films, including Avatar at the top, were written and directed by James Cameron.. With a worldwide box-office gross of over $2.9 billion, Avatar is proclaimed to be the "highest-grossing" film, but such claims usually refer to theatrical revenues only and do not take into account home video and television income, which can form a significant portion of a film ...

6. 2020 United States presidential election - Wikipedia

   en.wikipedia.org/wiki/2020_United_States...

   The 2020 United States presidential election was the 59th quadrennial presidential election, held on Tuesday, November 3, 2020. [a] The Democratic ticket of former vice president Joe Biden and the junior U.S. senator from California Kamala Harris defeated the incumbent Republican president, Donald Trump, and vice president, Mike Pence. [9]

7. Virginia's 10th congressional district - Wikipedia

   en.wikipedia.org/wiki/Virginia's_10th...

   January 25, 1830 – March 3, 1833 21st 22nd: Elected in 1829 to finish Rives's term and seated January 25, 1830. Re-elected in 1831. Redistricted to the 12th district. Joseph W. Chinn : Jacksonian: March 4, 1833 – March 3, 1835 23rd: Elected in 1833. Lost re-election. John Taliaferro (Fredericksburg) Anti-Jacksonian: March 4, 1835 – March ...