The National Bureau of Standards has adopted a new procedure for maintaining the US legal volt based on the determination of the ratio of 2e/h using the ac Josephson effect. Recent work at the University of Pennsylvania and NBS has shown that 2e/h can be determined in terms of a particular unit of voltage to 1 part in 10 million or better.

Topics
Josephson effect, Universities
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© 1972 American Institute of Physics.
1972
American Institute of Physics
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