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  2. Utility frequency - Wikipedia

    en.wikipedia.org/wiki/Utility_frequency

    The waveform of 230 V and 50 Hz compared with 120 V and 60 Hz. The utility frequency, (power) line frequency (American English) or mains frequency (British English) is the nominal frequency of the oscillations of alternating current (AC) in a wide area synchronous grid transmitted from a power station to the end-user.

  3. List of aircraft registration prefixes - Wikipedia

    en.wikipedia.org/wiki/List_of_aircraft...

    Archived (PDF) from the original on 2023-07-22. ICAO (2012). Annex 7, Aircraft Nationality and Registration Marks (PDF) (6 ed.). International Civil Aviation Organization. p. 15. ISBN 9789292490119. Archived (PDF) from the original on 2023-03-24. Robertson, Bruce (1976). Aircraft Markings of the World 1912-1967. Aero Publishers. pp. 21– 115.

  4. Extremely low frequency - Wikipedia

    en.wikipedia.org/wiki/Extremely_low_frequency

    The fundamental Schumann resonance is at approximately 7.83 Hz, the frequency at which the wavelength equals the circumference of the Earth, and higher harmonics occur at 14.1, 20.3, 26.4, and 32.4 Hz, etc. Lightning strikes excite these resonances, causing the Earth–ionosphere cavity to "ring" like a bell, resulting in a peak in the noise ...

  5. IBM Z - Wikipedia

    en.wikipedia.org/wiki/IBM_Z

    The zIIP is designed so that a program can work with z/OS to have all or a portion of its Service Request Block (SRB) dispatched work directed to the zIIP to help free up capacity on the general purpose processor which may make it available for use by other workloads running on the server. MIDAW. The Modified Indirect Data Address Word (MIDAW ...

  6. List of the United States Army weapons by supply catalog ...

    en.wikipedia.org/wiki/List_of_the_United_States...

    Ordnance crest "WHAT'S IN A NAME" - military education about SNL. This is a historic (index) list of United States Army weapons and materiel, by their Standard Nomenclature List (SNL) group and individual designations — an alpha-numeric nomenclature system used in the United States Army Ordnance Corps Supply Catalogues used from about 1930 to about 1958.

  7. Schumann resonances - Wikipedia

    en.wikipedia.org/wiki/Schumann_resonances

    The global electromagnetic resonance phenomenon is named after physicist Winfried Otto Schumann who predicted it mathematically in 1952. Schumann resonances are the principal background in the part of the electromagnetic spectrum [2] from 3 Hz through 60 Hz [3] and appear as distinct peaks at extremely low frequencies around 7.83 Hz (fundamental), 14.3, 20.8, 27.3, and 33.8 Hz.

  8. Mains hum - Wikipedia

    en.wikipedia.org/wiki/Mains_hum

    Mains hum, electric hum, cycle hum, or power line hum is a sound associated with alternating current which is twice the frequency of the mains electricity.The fundamental frequency of this sound is usually double that of fundamental 50/60 Hz, i.e., 100/120 Hz, depending on the local power-line frequency.

  9. Motorola ROKR - Wikipedia

    en.wikipedia.org/wiki/Motorola_ROKR

    The Z6, originally known as the Rizr Z6, was released on July 7, 2007. The Z6 features Motorola's new version of the embedded Linux -based operating system, MOTOMAGX . It also supports stereo Bluetooth technology ( A2DP ) and features a 2-megapixel digital camera.

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