壓縮圖片通常是很費時的,尤其有大量圖檔需要壓縮時,能節省一些時間就有賺到的感覺,而且又需要兼顧壓縮後的品質,你心目中是否已經有適合的軟體呢? Caesium 使...
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Time (the second, s)
2021年5月14日 — The second, symbol s, is the SI unit of time. It is defined by taking the fixed numerical value of the caesium frequency ΔvCs, the unperturbed ... ...(以下省略)
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Moreover, the nucleus of caesium-133 has a nuclear spin equal to 7/2. The simultaneous presence of electron spin and nuc...
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2014年10月4日 — Caesium is the chemical element that has literally redefined time. It ... caesium-133 atom. A diagram of ...
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Note that this frequency occurs when the Cesium-133 atom is in isolation at absolute zero temperature; in reality correc...
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Cesium-133 is the only natural isotope (100% natural abundance). Cesium has no known biological role, but may substitute...
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It is produced by irradiating the stable isotope cobalt-59 with neutrons in a nuclear reactor. Cobalt-60 is used in the ...
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2021年5月14日 — The second, symbol s, is the SI unit of time. It is defined by taking the fixed numerical value of the ca...
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2021年8月27日 — Cesium-133 is used for the definition of the second, because one of the first practical atomic clocks was...
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使用銫標准定義的第一組單位與時間有關,第二組單位於1967年定義為“9 192 631 770週期持續時間被定義為”。“Cesium-133原子”的意思是: 1 秒, s, = 9,192,631,770 ΔtCs1 ...
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131Cs, 人造, 9.689 天 · ε, 0.358, Xe. 133Cs, 100%, 穩定,帶78粒中子. 134Cs, 人造, 2.0650 年 · ε, 1.235, Xe · β, 2.059, Ba. 135Cs, 痕量,...
caesium 133 參考影音
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