"Kurt Gibble, at Penn State, made major contributions to the field of
primary frequency standards by developing models for the systematic
effects within caesium fountain clocks," Szymaniec said. "The
uncertainties of those effects, now reduced several fold with the new
models and numerical calculations provided by Gibble's group, have
been verified at the National Physical Laboratory and also by the
fountain clock group in Paris. Together with other improvements of
the caesium fountain, these models and numerical calculations have
improved the accuracy of the UK's caesium fountain clock , NPL-CsF2,
by reducing the uncertainty to 2.3 x 10-16 -- the lowest value for
any primary national standard so far."
http://www.rfglobalnet.com/article.mvc/Atomic-Clock-With-The-Worlds-Best-Long-Term-0001?sectionCode=News&templateCode=SponsorHeader&user=2164701&source=nl:31736
73 - Marco IK1ODO
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