cesium standard

См. также в других словарях:

• cesium — /see zee euhm/, n. a rare, highly reactive, soft, metallic element of the alkali metal group, used chiefly in photoelectric cells. Symbol: Cs; at. wt.: 132.905; at. no.: 55; sp. gr.: 1.9 at 20°C; melts at 28.5°C. Also, caesium. [1930 35; < NL,… …   Universalium

• cesium frequency standard — cezio dažnio etalonas statusas T sritis radioelektronika atitikmenys: angl. cesium frequency standard vok. Zäsiumfrequenznormal, n rus. цезиевый эталон частоты, m pranc. étalon de fréquence à césium, m …   Radioelektronikos terminų žodynas

• cesium 133 — noun Date: 1966 an isotope of cesium used especially in atomic clocks and one of whose atomic transitions is used as a scientific time standard …   New Collegiate Dictionary

• étalon de fréquence à césium — cezio dažnio etalonas statusas T sritis radioelektronika atitikmenys: angl. cesium frequency standard vok. Zäsiumfrequenznormal, n rus. цезиевый эталон частоты, m pranc. étalon de fréquence à césium, m …   Radioelektronikos terminų žodynas

• atomic clock — an extremely accurate electronic clock regulated by the resonance frequency of atoms or molecules of certain substances, as cesium. [1935 40] * * * ▪ instrument       type of clock that uses certain resonance frequencies of atoms (usually cesium… …   Universalium

• DUT1 — This graph shows the historical evolution of DUT1 between 1985 and 2009. The vertical segments are due to leap seconds. The time correction DUT1 (sometimes also written DUT) is the difference between Universal Time (UT1), which is defined by… …   Wikipedia

• ΔT — This article is about the time difference. For the temperature difference, see psychrometrics. ΔT vs. time from 1657 to 1984[1] ΔT, Delta T, delta T, deltaT, or DT is the time difference obtained by subtracting Universal Time (UT) from… …   Wikipedia

• Solar time — On a prograde planet like the Earth, the sidereal day is shorter than the solar day. At time 1, the Sun and a certain distant …   Wikipedia

• CBFS — cesium beam frequency standard …   Military dictionary

• Caesium — xenon ← caesium → barium Rb ↑ Cs ↓ Fr …   Wikipedia

• quantum mechanics — quantum mechanical, adj. Physics. a theory of the mechanics of atoms, molecules, and other physical systems that are subject to the uncertainty principle. Abbr.: QM Cf. nonrelativistic quantum mechanics, relativistic quantum mechanics. [1920 25]… …   Universalium