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  2. Middle gray - Wikipedia

    en.wikipedia.org/wiki/Middle_gray

    Middle gray. 50% CIELAB lightness. ( Y = 18.4%) In photography, painting, and other visual arts, middle gray or middle grey is a tone that is perceptually about halfway between black and white on a lightness scale; [1] in photography and printing, it is typically defined as 18% reflectance in visible light. [2] [3]

  3. History of the United Kingdom during the First World War

    en.wikipedia.org/wiki/History_of_the_United...

    Throughout 1917 Germany began to deploy increasing numbers of fixed-wing bombers, the Gotha G.IV's first target being Folkestone on 25 May 1917, following this attack the number of airship raids decreased rapidly in favour of raids by fixed wing aircraft, before Zeppelin raids were called off entirely.

  4. 25-pair color code - Wikipedia

    en.wikipedia.org/wiki/25-pair_color_code

    25-pair telco cable pinout. A common application of the 25-pair color code is the cabling for the Registered Jack interface RJ21, which uses a female 50-pin miniature ribbon connector, as shown in the following table. The geometry of the pins of the receptacle (right hand image) corresponds to the pin numbers of the table.

  5. List of supermarket chains in the United Kingdom - Wikipedia

    en.wikipedia.org/wiki/List_of_supermarket_chains...

    Tesco is the largest supermarket chain in the United Kingdom. There are 16 supermarket chains currently [when?] operating in the United Kingdom. The food retail market has been dominated by the 'big four' supermarkets – Tesco, Sainsbury's, Asda and Morrisons – who made up over three quarters of sector market share in 2010.

  6. US Army Regulation 25-50 - Wikipedia

    en.wikipedia.org/wiki/US_Army_Regulation_25-50

    US Army Regulation 25-50. The Army Regulation (AR) 25-50 Preparing and Managing Correspondence is the United States Army 's administrative regulation that "establishes three forms of correspondence authorized for use within the Army: a letter, a memorandum, and a message." [1]

  7. Raised-cosine filter - Wikipedia

    en.wikipedia.org/wiki/Raised-cosine_filter

    Mathematical description. The raised-cosine filter is an implementation of a low-pass Nyquist filter, i.e., one that has the property of vestigial symmetry. This means that its spectrum exhibits odd symmetry about , where is the symbol-period of the communications system. Its frequency-domain description is a piecewise -defined function, given by:

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