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Galileo rubidium clocks – a year of in-orbit experience
05-21-2007 · European Space Agency (ESA)Europe's first satellite-borne rubidium clocks have been in orbit for over a year. There is good news for the building of the Galileo system: the results obtained from GIOVE-A's first year of operations show performance that is largely in line with the specifications.
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Keywords: galileo, rubidium, clocks, in-orbit, experience, clock, orbit
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- Human circadian clocks couple to local sun time
01-22-2007 · EurekAlert!
By assessing the daily activity patterns of thousands of individuals living in different geographical locations, researchers have found evidence that the human circadian clock becomes coupled to so-called local sun time despite the fact that people live and work according to a common "social time" that is determined by time zones. The work also indicated that city dwellers appear to experience a relatively decreased influence of local sun time relative to those living in more sparsely populated areas.
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- Scientists Make Atomic Clock Breakthrough
10-13-2006 · ScienceDaily
Andrei Derevianko, Kyle Beloy, and Ulyana Safronova sat down six months ago and began work on a calculation that will help the world keep better time. In competition with scientists at the University of New South Wales, the University team led by associate professor Derevianko conducted research that increased the accuracy of atomic clocks, and they did it without running a single experiment.
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- Simplest circadian clocks operate via orderly phosphate transfers
10-04-2007 · EurekAlert!
Researchers at Harvard University and the Howard Hughes Medical Institute have found that a simple circadian clock found in some bacteria operates by the rhythmic addition and subtraction of phosphate groups at two key locations on a single protein. This phosphate pattern is influenced by two other proteins, driving phosphorylation to oscillate according to a remarkably accurate 24-hour cycle.
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- One year of Galileo signals; new website opens
01-12-2007 · European Space Agency (ESA)
One year ago today, GIOVE-A began transmitting Galileo navigation signals. This satellite is the first flight element in ESA's in-orbit validation programme for Galileo.
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- Scientists find high-fat diet disrupts body clock
11-06-2007 · EurekAlert!
For the first time, a Northwestern University and Evanston Northwestern Healthcare study has shown that overeating alters the core mechanism of the body clock, throwing off the timing of internal signals, including appetite control, critical for good health. Animals on a high-fat diet gained weight and suddenly exhibited a disruption in their circadian clocks, eating extra calories during the time they should have been asleep or at rest.
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- Hyper-accurate clocks – the beating heart of Galileo
05-10-2007 · European Space Agency (ESA)
Travellers have relied on accurate timekeeping for navigation since the development of the marine chronometer in the eighteenth century. Galileo, Europe's twenty-first century navigation system, also relies on clocks – but they are millions of times more accurate than those earlier timepieces.
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- Hyper-accurate clocks -- The beating heart of Galileo
05-10-2007 · EurekAlert!
Travellers have relied on accurate timekeeping for navigation since the development of the marine chronometer in the eighteenth century. Galileo, Europe’s twenty-first century navigation system, also relies on clocks -- but they are millions of times more accurate than those earlier timepieces.
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- Gene that makes people 'early to bed and early to rise' demystified
01-11-2007 · EurekAlert!
The recent discovery that a mutant "clock" gene made some people "early to bed and early to rise," a condition known as familial advanced sleep phase syndrome (FASPS), offered one of the first glimpses into the genetic basis of sleep in humans. Now, researchers report in the Jan. 12, 2007, issue of the journal Cell, published by Cell Press, new evidence that helps to explain just how their bodies' natural alarm clocks get set to such an early wake-up time.
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- Collaboration helps make JILA strontium atomic clock 'best in class'
02-14-2008 · EurekAlert!
A next-generation atomic clock that tops previous records for accuracy in clocks based on neutral atoms has been demonstrated by physicists at JILA, a joint institute of the Commerce Department's National Institute of Standards and Technology and the University of Colorado at Boulder.
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- Clock comparison yields clues to 'constant' change
02-15-2007 · EurekAlert!
Years of comparisons among the world's best atomic clocks -- based on different atoms -- have established the most precise limits ever achieved in the laboratory for detecting possible changes in so-called 'constants' of nature. The comparisons at NIST may help scientists test the latest theories in physics and develop a more complete understanding of the history of the universe.
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