«AMMONIA CLOCK» 관련 영어 책
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But the ammonia clock still requires clumsy and expensive equipment— quartz
crystals, frequency multipliers, and servo-mechanisms. Dr. Harold Lyons, who
built the first model, is now trying to eliminate these by working down from the
high ...
2
Academic Press Dictionary of Science and Technology
ammonia clock ammonium gluconate ammonia Clock Horology, a type of atomic
clock in which a maser separates ammonia molecules into two energy states; as
the molecules fall into a lower energy state, they oscillate at a constant ...
Christopher G. Morris, 1992
3
Precision Measurement and Calibration: Frequency and time, ...
Original NBS ammonia clock (courtesy of National Bureau of Standards. Boulder,
Colo.). that shown in Fig. 9) is presented in Fig. 10. Two versions of the NBS
ammonia clock were built with demonstrated long-term stabilities of 1 x 10" 7 and
2 ...
Original NBS ammonia clock (courtesy of National Bureau of Standards, Boulder,
Colo.). that shown in Fig. 9) is presented in Fig. 10. Two versions of the NBS
ammonia clock were built with demonstrated long-term stabilities of l x 10—7 and
2 ...
B. E. Blair, A. H. Morgan, 1972
5
Splitting The Second: The Story of Atomic Time
Ammonia clock As fate would have it, the first atomic clock was not based on
caesium at all. It was not even based on an atom, but on a molecule. Harold
Lyons, a physicist working at the US National Bureau of Standards (NBS) in
Washington ...
6
Glossary of Mapping Science
The first clock of this kind was the ammonia clock, using the molecules of
gaseous ammonia to provide the basic frequency. Radio waves generated in an
attached circuit were fed into the gas and the frequency of the circuit adjusted
until ...
American Society of Civil Engineers, 1994
7
A Dictionary of Science
These release ammonium ions, which are converted by nitrifying bacteria into
nitrite and nitrate ions. ammoniacal Describing a solution in which the solvent is
aqueous ammonia. ammonia clock A form ofatomic clock in which the frequency
of ...
John Daintith, Elizabeth A. Martin, 2010
The ammonia clock is not used as much in experimentation because of the
greater accuracy of the cesium clock. The ammonia clock works in a frequency of
slightly over twenty-three thousand hertz, whereas a cesium clock works in a ...
Michael Lewis White, 2010
9
The Laser in America, 1950-1970
It did not appear, however, that the ammonia clock could be refined much further.
High-precision clocks and microwave frequency standards had a number of
potential applications. Precise atomic clocks could be used to determine whether
...
Work continues elsewhere on the ammonia clock, notably in the United States,
the Soviet Union and Switzerland. Dr. Jacques Bonanomi, of the Swiss
Watchmaking Research Laboratory, has built an ammonia clock which is reputed
to be ...
