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・ Ground beef
・ Ground beetle
・ Ground biscuit
・ Ground blizzard
・ Ground bounce
・ Ground bow
・ Ground Breaking Ceremony
・ Ground bug
・ Ground burst
・ Ground carriage
・ Ground ceremony
・ Ground combat element
・ Ground Combat Vehicle
・ Ground communication outlet
・ Ground Components
Ground conductivity
・ Ground constants
・ Ground continuity monitor
・ Ground control
・ Ground Control (film)
・ Ground Control (video game)
・ Ground Control Ltd
・ Ground control station
・ Ground Crew Project
・ Ground cuckooshrike
・ Ground cuscus
・ Ground Defense Force! Mao-chan
・ Ground delay program
・ Ground developments to football stadiums in the English football league system
・ Ground dipole


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Ground conductivity : ウィキペディア英語版
Ground conductivity

Ground conductivity refers to the electrical conductivity of the subsurface of the earth. In the International System of Units (SI) it is measured in millisiemens per meter (mS/m).
==Radio propagation==
(詳細はsurface wave (ground wave) radio transmissions. Low frequency (30–300 kHz) and medium frequency (300–3000 kHz) radio transmissions are particularly reliant on good ground conductivity as their primary propagation is by surface wave. It also affects the real world radiation pattern of high frequency (3-30 MHz) antennas. For this reason ITU publishes an extensive world atlas of ground conductivities.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Ground conductivity」の詳細全文を読む



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