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 |
4.8 / 5 (46) |
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Proposed nuclear clock may keep time with the Universe
(PhysOrg.com) -- A proposed new time-keeping system tied to the orbiting of a neutron around an atomic nucleus could have such unprecedented accuracy that it neither gains nor loses 1/20th of a second in 14 ...
Mar 08, 2012 |
4.6 / 5 (27) |
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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 pattern in our biological clock overturns long-held theory
(PhysOrg.com) -- University of Michigan mathematicians and their British colleagues say they have identified the signal that the brain sends to the rest of the body to control biological rhythms, a finding that overturns ...
Medicine & Health / Medical research
Oct 08, 2009 |
4.9 / 5 (22) |
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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 |
4.7 / 5 (22) |
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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 |
4.6 / 5 (20) |
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Scientists Build First 'Frequency Comb' To Display Visible 'Teeth'
(PhysOrg.com) -- Finally, an optical frequency comb that visibly lives up to its name. Scientists at the University of Konstanz in Germany and the National Institute of Standards and Technology in the U.S. ...
Oct 29, 2009 |
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Jet Lag Sends Brain Ahead A Time Zone, Leaves Kidneys In Another
Human beings aren't built to cross time zones. After an international flight, it takes days for the body to overcome the fatigue and nausea of jet lag, the biological price of doing business in the modern ...
Medicine & Health / Medical research
Jun 26, 2010 |
4.4 / 5 (19) |
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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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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 |
4.6 / 5 (16) |
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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 |
4.9 / 5 (14) |
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Namibia sponge fossils are world's first animals: study
Scientists digging in a Namibian national park have uncovered sponge-like fossils they say are the first animals, a discovery that would push the emergence of animal life back millions of years.
Other Sciences / Archaeology & Fossils
Feb 06, 2012 |
4.7 / 5 (14) |
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Scientists Discover Hunger's Timekeeper
(PhysOrg.com) -- Researchers at Columbia and Rockefeller Universities have identified cells in the stomach that regulate the release of a hormone associated with appetite. The group is the first to show that ...
Medicine & Health / Medical research
Aug 28, 2009 |
4.8 / 5 (12) |
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Rare disease reveals new path for creating stem cells
(PhysOrg.com) -- As debilitating as disease can be, sometimes it acts as a teacher. Researchers at Harvard Medical School and the Harvard School of Dental Medicine have found that by mimicking a rare genetic ...
Medicine & Health / Medical research
Nov 21, 2010 |
5 / 5 (11) |
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Body's circadian rhythm tightly entwined with blood sugar control
Scientists have long struggled to understand the body's biological clock. Its tick-tock wakes us up, reminds us to eat and tells us when to go to bed. But what sets that circadian rhythm?
Medicine & Health / Medical research
Oct 05, 2009 |
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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.
