News tagged with clock
Quantum measurement precision approaches Heisenberg limit
(PhysOrg.com) -- In the classical world, scientists can make measurements with a degree of accuracy that is restricted only by technical limitations. At the fundamental level, however, measurement precision ...
Feb 26, 2010 |
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Group finds circadian clock common to almost all life forms
(Phys.org) -- A group of biology researchers, led by Akhilesh Reddy from Cambridge University have found an enzyme that they believe serves as a circadian clock that operates in virtually all forms of life. ...
May 17, 2012 |
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No-photon laser: Physicists demonstrate 'superradiant' laser design
Physicists at JILA have demonstrated a novel "superradiant" laser design, which has the potential to be 100 to 1,000 times more stable than the best conventional visible lasers. This type of laser could boost ...
Apr 04, 2012 |
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Researchers develop blueprint for nuclear clock accurate over billions of years
A clock accurate to within a tenth of a second over 14 billion years – the age of the universe – is the goal of research being reported this week by scientists from three different institutions. ...
Mar 19, 2012 |
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Physicists create first 'frequency comb' to probe ultraviolet wavelengths
Physicists at JILA have created the first "frequency comb" in the extreme ultraviolet band of the spectrum, high-energy light less than 100 nanometers (nm) in wavelength. Laser-generated frequency combs are the most accurate ...
Feb 01, 2012 |
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Toward faster transistors: New physical phenomenon could lead to increases in computers' clock speed
In the 1980s and ’90s, competition in the computer industry was all about "clock speed" — how many megahertz, and ultimately gigahertz, a chip could boast. But clock speeds stalled out almost 10 ...
May 13, 2011 |
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World's smallest atomic clock on sale
(PhysOrg.com) -- A matchbook-sized atomic clock 100 times smaller than its commercial predecessors has been created by a team of researchers at Symmetricom Inc. Draper Laboratory and Sandia National Laboratories.
May 02, 2011 |
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Quantum quirk: Scientists pack atoms together to prevent collisions in atomic clock
In a paradox typical of the quantum world, JILA scientists have eliminated collisions between atoms in an atomic clock by packing the atoms closer together. The surprising discovery, described in the Feb. ...
Feb 03, 2011 |
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Ancient body clock discovered that helps to keep all living things on time
The mechanism that controls the internal 24-hour clock of all forms of life from human cells to algae has been identified by scientists.
Jan 26, 2011 |
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New chemical may lead to jet lag drug
(PhysOrg.com) -- Jet lag, as every long-distance airline passenger knows, disrupts the body's normal circadian rhythms, or body clocks, and causes some very unpleasant effects such as disturbed sleep and fatigue. ...
Dec 16, 2010 |
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Babies' biological clocks dramatically affected by birth light cycle
The season in which babies are born can have a dramatic and persistent effect on how their biological clocks function.
Medicine & Health / Neuroscience
Dec 05, 2010 |
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GPS getting an upgrade - for $8 billion
(PhysOrg.com) -- GPS is getting an upgrade costing $8 billion (US), which aims to increase the system's accuracy, improve its reliability, and make the technology even more widespread.
May 25, 2010 |
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To Arctic animals, time of day really doesn't matter
In the far northern reaches of the Arctic, day versus night often doesn't mean a whole lot. During parts of the year, the sun does not set; at other times, it's just the opposite. A new study reported online ...
Mar 11, 2010 |
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Why you are not thirsty while sleeping
(PhysOrg.com) -- New research suggests the body's internal clock is what prevents you from becoming dehydrated and needing to drink during sleep.
Medicine & Health / Neuroscience
Mar 02, 2010 |
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'Quantum Logic Clock' Based on Aluminum Ion is Now World's Most Precise Clock (w/ Video)
(PhysOrg.com) -- Physicists at the National Institute of Standards and Technology have built an enhanced version of an experimental atomic clock based on a single aluminum atom that is now the world’s most ...
Feb 04, 2010 |
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Clock
A clock is an instrument used to indicate, keep, and co-ordinate time. The word clock is derived ultimately (via Dutch, Northern French, and Medieval Latin) from the Celtic words clagan and clocca meaning "bell". A silent instrument missing such a mechanism has traditionally been known as a timepiece. In general usage today a "clock" refers to any device for measuring and displaying the time. Watches and other timepieces that can be carried on one's person are often distinguished from clocks.
The clock is one of the oldest human inventions, meeting the need to consistently measure intervals of time shorter than the natural units: the day; the lunar month; and the year. Devices operating on several different physical processes have been used over the millennia, culminating in the clocks of today.
For more information about Clock, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
