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" The second is the duration of 9, 192, 631, 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium- 133 atom (13th CGPM, 1967). "
Expert Network Time Protocol: An Experience in Time with NTP - Página 15
por Peter Rybaczyk - 2006 - 153 páginas
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American Practical Navigator, Volumen1

1977
...1967 the atomic second was defined by the Thirteenth General Conference on Weights and Measures as the duration of 9,192,631,770 periods of the radiation corresponding to the transition between two hyperfine levels of the ground state of the cesium atom 133. This value was established to agree...
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Scientific American, Volumen223

1970
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Scientific American, Volumen218

1968
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Engineering, Volumen211

1971
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Science, Volumen226

1984
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Standard Handbook for Electrical Engineers

Donald G. Fink, H. Wayne Beaty - 1993 - 2416 páginas
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NBS Special Publication, Tema 330

1974
...International System of Units is the second defined as follows: "The second is the duration of 9 192 631 770 periods of the radiation corresponding to the transition...the two hyperfine levels of the ground state of the cesium-133 atom". 2 Resolution 1 adopted by the CIPM at its meeting of 1956 and Resolution 9 of the...
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NBS Special Publication, Tema 311

1969
...accurately than it could be done by astronomical means. So the second, since October 1967, is now defined as the duration of 9,192,631,770 periods of the radiation...transition between the two hyper-fine levels of the fundamental state of the atom cesium 133. Our Institute for Basic Standards is actively involved in...
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Bulletin of the American Meteorological Society, Volumen50

American Meteorological Society - 1969
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Welding Handbook

American Welding Society - 1976
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