Matches in DBpedia 2016-04 for { <http://dbpedia.org/resource/Atomic_clock> ?p ?o }
- Atomic_clock abstract "An atomic clock is a clock device that uses an electronic transition frequency in the microwave, optical, or ultraviolet region of the electromagnetic spectrum of atoms as a frequency standard for its timekeeping element. Atomic clocks are the most accurate time and frequency standards known, and are used as primary standards for international time distribution services, to control the wave frequency of television broadcasts, and in global navigation satellite systems such as GPS.The principle of operation of an atomic clock is not based on nuclear physics, but rather on atomic physics; it uses the microwave signal that electrons in atoms emit when they change energy levels. Early atomic clocks were based on masers at room temperature. Currently, the most accurate atomic clocks first cool the atoms to near absolute zero temperature by slowing them with lasers and probing them in atomic fountains in a microwave-filled cavity. An example of this is the NIST-F1 atomic clock, one of the national primary time and frequency standards of the United States.The accuracy of an atomic clock depends on two factors. The first factor is temperature of the sample atoms—colder atoms move much more slowly, allowing longer probe times. The second factor is the frequency and intrinsic width of the electronic transition. Higher frequencies and narrow lines increase the precision.National standards agencies in many countries maintain a network of atomic clocks which are intercompared and kept synchronized to an accuracy of 10−9 seconds per day (approximately 1 part in 1014). These clocks collectively define a continuous and stable time scale, International Atomic Time (TAI). For civil time, another time scale is disseminated, Coordinated Universal Time (UTC). UTC is derived from TAI, but approximately synchronised, by using leap seconds, to UT1, which is based on actual rotation of the Earth with respect to the solar time.".
- Atomic_clock thumbnail FOCS-1.jpg?width=300.
- Atomic_clock wikiPageExternalLink a112z506.pdf.
- Atomic_clock wikiPageExternalLink mep.html.
- Atomic_clock wikiPageExternalLink miniclock.cfm.
- Atomic_clock wikiPageExternalLink optical-comb.html.
- Atomic_clock wikiPageExternalLink trapped-ion.html.
- Atomic_clock wikiPageExternalLink Q10.
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- Atomic_clock wikiPageExternalLink 4023777.stm.
- Atomic_clock wikiPageExternalLink nist.time.gov.
- Atomic_clock wikiPageExternalLink tycho.usno.navy.mil.
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- Atomic_clock wikiPageExternalLink time.
- Atomic_clock wikiPageExternalLink www.ptb.de.
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- Atomic_clock wikiPageWikiLink Absolute_zero.
- Atomic_clock wikiPageWikiLink Accuracy_and_precision.
- Atomic_clock wikiPageWikiLink Age_of_the_universe.
- Atomic_clock wikiPageWikiLink Allan_variance.
- Atomic_clock wikiPageWikiLink Aluminium.
- Atomic_clock wikiPageWikiLink Ammonia.
- Atomic_clock wikiPageWikiLink Atom.
- Atomic_clock wikiPageWikiLink Atomic_clock.
- Atomic_clock wikiPageWikiLink Atomic_fountain.
- Atomic_clock wikiPageWikiLink Atomic_physics.
- Atomic_clock wikiPageWikiLink Atomichron.
- Atomic_clock wikiPageWikiLink Attosecond.
- Atomic_clock wikiPageWikiLink Bandwidth_(signal_processing).
- Atomic_clock wikiPageWikiLink BeiDou_Navigation_Satellite_System.
- Atomic_clock wikiPageWikiLink Beryllium.
- Atomic_clock wikiPageWikiLink Boulder,_Colorado.
- Atomic_clock wikiPageWikiLink Caesium.
- Atomic_clock wikiPageWikiLink Caesium_standard.
- Atomic_clock wikiPageWikiLink Calcium.
- Atomic_clock wikiPageWikiLink Category:Atomic_clocks.
- Atomic_clock wikiPageWikiLink Category:Electronic_test_equipment.
- Atomic_clock wikiPageWikiLink Chip-scale_package.
- Atomic_clock wikiPageWikiLink Clock.
- Atomic_clock wikiPageWikiLink Clock_drift.
- Atomic_clock wikiPageWikiLink Coordinated_Universal_Time.
- Atomic_clock wikiPageWikiLink David_J._Wineland.
- Atomic_clock wikiPageWikiLink Deep_Space_Atomic_Clock.
- Atomic_clock wikiPageWikiLink Earths_rotation.
- Atomic_clock wikiPageWikiLink Electricity.
- Atomic_clock wikiPageWikiLink Electromagnetic_spectrum.
- Atomic_clock wikiPageWikiLink Electron.
- Atomic_clock wikiPageWikiLink Energy_level.
- Atomic_clock wikiPageWikiLink Ensemble_effect.
- Atomic_clock wikiPageWikiLink Ephemeris_time.
- Atomic_clock wikiPageWikiLink Fabry–Pérot_interferometer.
- Atomic_clock wikiPageWikiLink Femtosecond.
- Atomic_clock wikiPageWikiLink Frequency.
- Atomic_clock wikiPageWikiLink Frequency_comb.
- Atomic_clock wikiPageWikiLink Frequency_standard.
- Atomic_clock wikiPageWikiLink GLONASS.
- Atomic_clock wikiPageWikiLink GPS_disciplined_oscillator.
- Atomic_clock wikiPageWikiLink Galileo_(satellite_navigation).
- Atomic_clock wikiPageWikiLink Geodesy.
- Atomic_clock wikiPageWikiLink Global_Positioning_System.
- Atomic_clock wikiPageWikiLink Gravitational_time_dilation.
- Atomic_clock wikiPageWikiLink Hertz.
- Atomic_clock wikiPageWikiLink Hewlett-Packard.
- Atomic_clock wikiPageWikiLink Hydrogen_line.
- Atomic_clock wikiPageWikiLink Hydrogen_maser.
- Atomic_clock wikiPageWikiLink Hyperfine_structure.
- Atomic_clock wikiPageWikiLink Indium.
- Atomic_clock wikiPageWikiLink Interferometry.
- Atomic_clock wikiPageWikiLink International_Atomic_Time.
- Atomic_clock wikiPageWikiLink International_Bureau_of_Weights_and_Measures.
- Atomic_clock wikiPageWikiLink International_Committee_for_Weights_and_Measures.
- Atomic_clock wikiPageWikiLink International_System_of_Units.
- Atomic_clock wikiPageWikiLink Internet.
- Atomic_clock wikiPageWikiLink Ion.
- Atomic_clock wikiPageWikiLink Isidor_Isaac_Rabi.
- Atomic_clock wikiPageWikiLink Isotopes_of_caesium.
- Atomic_clock wikiPageWikiLink Isotopes_of_hydrogen.
- Atomic_clock wikiPageWikiLink Isotopes_of_rubidium.
- Atomic_clock wikiPageWikiLink Isotopes_of_strontium.
- Atomic_clock wikiPageWikiLink Isotopes_of_ytterbium.
- Atomic_clock wikiPageWikiLink JILA.
- Atomic_clock wikiPageWikiLink John_L._Hall.
- Atomic_clock wikiPageWikiLink Journal_of_the_Physical_Society_of_Japan.
- Atomic_clock wikiPageWikiLink Jun_Ye.
- Atomic_clock wikiPageWikiLink Laser_cooling.
- Atomic_clock wikiPageWikiLink Leap_second.
- Atomic_clock wikiPageWikiLink Light.
- Atomic_clock wikiPageWikiLink List_of_atomic_clocks.
- Atomic_clock wikiPageWikiLink Lock-in_amplifier.
- Atomic_clock wikiPageWikiLink Louis_Essen.
- Atomic_clock wikiPageWikiLink Magnesium.
- Atomic_clock wikiPageWikiLink Magneto-optical_trap.
- Atomic_clock wikiPageWikiLink Maser.
- Atomic_clock wikiPageWikiLink Mercury_(element).