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  2. Electromagnetic shielding - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_shielding

    Electromagnetic shielding. Electromagnetic shielding cages inside a disassembled mobile phone. In electrical engineering, electromagnetic shielding is the practice of reducing or redirecting the electromagnetic field (EMF) in a space with barriers made of conductive or magnetic materials. It is typically applied to enclosures, for isolating ...

  3. Extremely low frequency - Wikipedia

    en.wikipedia.org/wiki/Extremely_low_frequency

    Extremely low frequency ( ELF) is the ITU designation [1] for electromagnetic radiation ( radio waves) with frequencies from 3 to 30 Hz, and corresponding wavelengths of 100,000 to 10,000 kilometers, respectively. [2] [3] In atmospheric science, an alternative definition is usually given, from 3 Hz to 3 kHz. [4] [5] In the related magnetosphere ...

  4. Counter-electromotive force - Wikipedia

    en.wikipedia.org/wiki/Counter-electromotive_force

    Counter-electromotive force. Counter-electromotive force ( counter EMF, CEMF, back EMF ), [1] is the electromotive force (EMF) manifesting as a voltage that opposes the change in current which induced it. CEMF is the EMF caused by electromagnetic induction .

  5. Blue Cross Blue Shield Association - Wikipedia

    en.wikipedia.org/wiki/Blue_Cross_Blue_Shield...

    Website. www .bcbs .com. Blue Cross Blue Shield Association, also known as BCBS, BCBSA, or The Blues, is a United States -based federation with 34 independent and locally-operated BCBSA companies that provide health insurance in the United States to more than 115 million people as of 2022. [ 2][ 3] It was formed in 1982 from the merger of its ...

  6. List of file formats - Wikipedia

    en.wikipedia.org/wiki/List_of_file_formats

    ARC – Nintendo U8 Archive (mostly Yaz0 compressed) ARJ – ARJ compressed file. ASS, SSA – ASS (also SSA): a subtitles file created by Aegisub, a video typesetting application (also a Halo game engine file) B – (B file) Similar to .a, but less compressed. BA – BA: Scifer Archive (.ba), Scifer External Archive Type.

  7. Windows Metafile - Wikipedia

    en.wikipedia.org/wiki/Windows_Metafile

    Windows Metafile. Windows Metafile ( WMF) is an image file format originally designed for Microsoft Windows in the 1990s. The original Windows Metafile format was not device-independent (though could be made more so with placement headers) and may contain both vector graphics and bitmap components. It acts in a similar manner to SVG files.

  8. File:NTTA shield template.svg - Wikipedia

    en.wikipedia.org/wiki/File:NTTA_shield_template.svg

    This file is in the public domain because it comes from the Texas Manual on Uniform Traffic Control Devices or the Standard Highway Sign Designs For Texas. Any traffic control device design or application provision contained in this Manual shall be considered to be in the public domain .

  9. Blue Shield of California - Wikipedia

    en.wikipedia.org/wiki/Blue_Shield_of_California

    Blue Shield of California is a mutual benefit corporation and health plan [ 6 ][ 7 ] founded in 1939 by the California Medical Association. It is based in Oakland, California, and serves 4.5 million health plan members and more than 65,000 physicians across the state. Blue Shield of California was founded as a not-for-profit organization.