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  2. Structural channel - Wikipedia

    en.wikipedia.org/wiki/Structural_channel

    Structural channel. The structural channel, also known as a C-channel or Parallel Flange Channel (PFC), is a type of (usually structural steel) beam, used primarily in building construction and civil engineering. Its cross section consists of a wide "web", usually but not always oriented vertically, and two "flanges" at the top and bottom of ...

  3. Strut channel - Wikipedia

    en.wikipedia.org/wiki/Strut_channel

    Shapes Cross section diagram of standard strut channel. Basic strut channel comes in the open box section 1 + 5 ⁄ 8 in (41 mm) square. A half height 1 + 5 ⁄ 8 in × 13 ⁄ 16 in (41 mm × 21 mm) version is also available, used mostly where mounted directly to a wall as it has significantly less stiffness and ability to carry loads across an open space or brace.

  4. List of common display resolutions - Wikipedia

    en.wikipedia.org/wiki/List_of_common_display...

    16:9. 8,294,400. 7680 × 4320. 8K UHDTV. 4320p. 33,177,600. Many of these resolutions are also used for video files that are not broadcast. These may also use other aspect ratios by cropping otherwise black bars at the top and bottom which result from cinema aspect ratios greater than 16∶9, such as 1.85 or 2.35 through 2.40 (dubbed ...

  5. French catheter scale - Wikipedia

    en.wikipedia.org/wiki/French_catheter_scale

    The French size is a measure of the outer diameter of a catheter (not internal drainage channel, or inner diameter). So, for example, if a two-way catheter of 20 Fr is compared to a 20 Fr three-way catheter, they both have the same external diameter but the two-way catheter will have a larger drainage channel than the three-way.

  6. C band (IEEE) - Wikipedia

    en.wikipedia.org/wiki/C_band_(IEEE)

    The C band is a designation by the Institute of Electrical and Electronics Engineers (IEEE) for a portion of the electromagnetic spectrum in the microwave range of frequencies ranging from 4.0 to 8.0 gigahertz (GHz). [1] However, the U.S. Federal Communications Commission C band proceeding and auction, designated 3.7–4.2 GHz as C band. [2]

  7. Television channel frequencies - Wikipedia

    en.wikipedia.org/wiki/Television_channel_frequencies

    ISDB-Tb frequency DTV channel 14 uses 473.142857 MHz, but ATSC 3.0, DVB-T / DVB-T2, and DTMB, use 473.0 MHz. Channel 37 is reserved for radio astronomy in the United States, Canada, Bermuda, Belize, and the Bahamas, thus there are no television stations assigned to it.

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