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This profile was last updated on 3/1/06  and contains information from public web pages and contributions from the ZoomInfo community.

Dr. John D. Prestage

Wrong Dr. John D. Prestage?
 
Background

Employment History

18 Total References
Web References
Best-in-Space: News: NASA-Built Atomic Clock Does the Time Warp, Again
www.best-in-space.com, 1 Mar 2006 [cached]
"Atomic ions colliding with this sort of 'wall' are disturbed about 10,000 times less than in glass cell-based atomic clocks," said Dr. John Prestage of the JPL Quantum Sciences and Technology Group.
In microgravity, the atoms linger in ...
www.andhrajyothy.com [cached]
In microgravity, the atoms linger in the cavity, allowing for longer and more accurate measurements, said John Prestage of NASA's Jet Propulsion Laboratory in California. ACES should be at least 100 times as accurate as the clocks on GPS satellites, he said.
IEEE UFFC Frequency Control Home
www.ieee-uffc.org, 18 Dec 2003 [cached]
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Technical Program Committee Administrator
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Astronomy Online Pty. Limited - Home
www.riflescopes.com.au, 4 Mar 2004 [cached]
based atomic clocks," said Dr. John Prestage of the JPL Quantum Sciences and Technology Group.
Techdigital.net Dedicated to space programs and sciene - NASA-BUILT atomic clock does the time warp, again
www.techdigital.net, 1 Jan 2002 [cached]
"Atomic ions colliding with this sort of 'wall' are disturbed about 10,000 times less than in glass cell-based atomic clocks," said Dr. John Prestage of the JPL Quantum Sciences and Technology Group.Because the mercury ions have a positive charge, they can be held with oscillating electric fields in a container produced with metallic electrodes inside an ultra-high vacuum system, and made into a clock.
Like all clocks, atomic clocks measure frequency of a recurring event to keep time.A wonder of quantum mechanics that govern the world of atoms is that every isolated atom in the universe is exactly the same as every other atom of the same element and containing the same number of neutrons.Atomic clocks have unique measurement capability because every atom or ion in the clock is quantum-mechanically identical to every other one.Therefore, by measuring the transition of atoms as they move back and forth between two energy levels, atomic clocks provide an absolute reference for frequency and time.
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