hydrogen maser atomic clock
(cryptography) To calculate the differences between the characters in an enciphered text and the characters a fixed number of positions previous.
(colloquial) Mononucleosis.
A person who takes downblouse photographs or video footage.
an atomic clock which uses the 1.4 GHz transition in a hydrogen atom to measure time to within 0.45 nanoseconds over a span of 12 hours
衛星に搭載された水素原子の1.4 GHz遷移を利用する原子時計は、12時間で0.45ナノ秒以内の精度で地上局と同期を維持しました。
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