- extremely low frequencies (ELF)
- Радио: крайне низкие частоты (0,3-3 кГц)
Универсальный англо-русский словарь. Академик.ру. 2011.
extremely low frequencies (ELF)
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Extremely low frequency — (ELF) is the band of radio frequencies from 3 to 30 Hz. ELF was used by the US Navy and Soviet/Russian Navy to communicate with submerged submarines.ExplanationBecause of the electrical conductivity of salt water, submarines are shielded from… … Wikipedia
Elf (disambiguation) — ELF as an acronym, may refer to:Science and technology:* Electron localization function, a concept in quantum mechanics * Executable and Linkable Format, a common object file format for Unix * Extremely low frequency, the band of radio… … Wikipedia
Extremely high frequency — Frequency range 30 to 300 GHz ITU Radio Band Numbers 1 2 3 4 5 6 7 8 9 10 … Wikipedia
Super low frequency — (SLF) is the frequency range between 30 hertz and 300 hertz. This frequency range includes the frequencies of AC power grids (50 hertz and 60 hertz). The radio services Seafarer (USA) on 76 hertz and ZEVS (Russia) on 82 hertz operate in this… … Wikipedia
Schumann resonances — The Schumann resonances (SR) are a set of spectrum peaks in the extremely low frequency (ELF) portion of the Earth s electromagnetic field spectrum. Schumann resonances are global electromagnetic resonances, excited by lightning discharges in the … Wikipedia
Mobile phone radiation and health — A man speaking on a mobile telephone The effect of mobile phone radiation on human health is the subject of recent interest and study, as a result of the enormous increase in mobile phone usage throughout the world (as of June 2009 … Wikipedia
Tom Clancy's Net Force — For the 1999 television movie, see NetForce (film). Tom Clancy s Net Force is a novel series, created by Tom Clancy and Steve Pieczenik and written by Steve Perry. It is set in 2010 and charts the actions of Net Force: a special division of the… … Wikipedia
Electromagnetic radiation and health — Electromagnetic radiation can be classified into ionizing radiation and non ionizing radiation, based on whether it is capable of ionizing atoms and breaking chemical bonds. Ultraviolet and higher frequencies, such as X rays or gamma rays are… … Wikipedia
electromagnetic radiation — Physics. radiation consisting of electromagnetic waves, including radio waves, infrared, visible light, ultraviolet, x rays, and gamma rays. [1950 55] * * * Energy propagated through free space or through a material medium in the form of… … Universalium
High Frequency Active Auroral Research Program — HAARP is often confused with Project HARP, the High Altitude Research Project (a joint project of The Pentagon and the Canadian Department of National Defence).The High Frequency Active Auroral Research Program (HAARP) is an investigation project … Wikipedia
Espectro electromagnético — Saltar a navegación, búsqueda Diagrama del espectro electromagnético, mostrando el tipo, longitud de onda con ejemplos, frecuencia y temperatura de emisión de cuerpo negro. Se denomina espectro electromagnético a la distribución energética del… … Wikipedia Español
