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medium and high frequency

См. также в других словарях:

  • High frequency — (HF) radio frequencies are between 3 and 30 MHz. Also known as the decameter band or decameter wave as the wavelengths range from one to ten decameters (ten to one hundred metres). Frequencies immediately below HF are denoted Medium frequency… …   Wikipedia

  • 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

  • High frequency approximation — A high frequency approximation (or high energy approximation ) for scattering or other wave propagation problems, in physics or engineering, is an approximation whose accuracy increases with the size of features on the scatterer or medium… …   Wikipedia

  • high frequency — noun Date: 1892 a radio frequency between very high frequency and medium frequency see radio frequency table …   New Collegiate Dictionary

  • Advanced Extremely High Frequency — The Advanced Extremely High Frequency (AEHF) system will provide connectivity across the spectrum of mission areas, including land, air and naval warfare; special operations; strategic nuclear operations; strategic defense; theater missile… …   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

  • High Voltage Partial Discharge — (HVPD), Ltd. Тип Частная комп …   Википедия

  • Medium frequency — Frequency range 0.3 to 3 MHz ITU Radio Band Numbers 1 2 3 4 5 6 7 8 9 10 …   Wikipedia

  • High-speed rail — is a type of passenger rail transport that operates significantly faster than the normal speed of rail traffic. Specific definitions include 200 km/h (124 mph) and faster depending on whether the track is upgraded or new by the European Union,… …   Wikipedia

  • Frequency — For other uses, see Frequency (disambiguation). Three cyclically flashing lights, from lowest frequency (top) to highest frequency (bottom). f is the frequency in hertz (Hz), meaning the number of cycles per second. T is the period in seconds (s) …   Wikipedia

  • High-intensity focused ultrasound — Contents 1 Theory 2 Aiming 3 How HIFU works 4 Method of use …   Wikipedia

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