Results 51 to 60 of about 37,255 (283)
Galileo: orologi atomici e ridondanze
GEOmedia, 2017 Galileo atomic clocks and redundancies. Some malfunction on board of Galileo satellites are likely to affect the results of the satellite positioning system.
Gianluca Pititto
doaj +2 more sources
Science, 2013 Physics Atomic clocks housed in national laboratories around the world provide a precise time signal on which our present high-technology lives depend. Precise synchronization allows for colossal amounts of data to be reliably transferred around networks of optic fibers at ever-increasing rates, as well as providing accurate navigation systems.
openaire +1 more source
Cold atom clocks and applications [PDF]
Journal of Physics B: Atomic, Molecular and Optical Physics, 2005 This paper describes advances in microwave frequency standards using laser-cooled atoms at BNM-SYRTE. First, recent improvements of the $^{133}$Cs and $^{87}$Rb atomic fountains are described. Thanks to the routine use of a cryogenic sapphire oscillator as an ultra-stable local frequency reference, a fountain frequency instability of $1.6\times 10^{-14}
Bize, Sébastien +16 more
openaire +4 more sources
FEBS Letters, EarlyView.This perspective highlights emerging insights into how the circadian transcription factor CLOCK:BMAL1 regulates chromatin architecture, cooperates with other transcription factors, and coordinates enhancer dynamics. We propose an updated framework for how circadian transcription factors operate within dynamic and multifactorial chromatin landscapes ...
Xinyu Y. Nie, Jerome S. Menet
wiley +1 more source
Inner-shell clock transition in atomic thulium with a small blackbody radiation shift
Nature Communications, 2019 Precise and stable optical clocks are important for fundamental science and applications. Here the authors demonstrate a clock transitions in thulium (Tm), which has a small black body radiation frequency shift and is suitable for transportable atomic ...
A. Golovizin +6 more
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The Brazilian time and frequency atomic standards program
Anais da Academia Brasileira de Ciências, 2008 Cesium atomic beam clocks have been the workhorse for many demanding applications in science and technology for the past four decades. Tests of the fundamental laws of physics and the search for minute changes in fundamental constants, the ...
Mushtaq Ahmed +7 more
doaj +1 more source
A study of clock effects in Newton–Maxwell formalism
Geodesy and Geodynamics, 2020 Many measurements on the time gain/loss of the atomic clocks orbiting the spinning Earth have been done. The time gain/loss of the atomic clocks orbiting the spinning Earth is called gravitomagnetic clock effects.
Sankar Hajra
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Quasars as very-accurate clock synchronizers [PDF]
, 1975 Quasars can be employed to synchronize global data communications, geophysical measurements, and atomic clocks. It is potentially two to three orders of magnitude better than presently-used Moon-bounce system.
Goldstein, R. M., Hurd, W. J.
core +1 more source
Space-time sensors using multiple-wave atom levitation
, 2009 The best clocks to date control the atomic motion by trapping the sample in an optical lattice and then interrogate the atomic transition by shining on these atoms a distinct laser of controlled frequency.
C. J. Bordé +3 more
core +2 more sources
Real‐time assay of ribonucleotide reductase activity with a fluorescent RNA aptamer
FEBS Letters, EarlyView.Ribonucleotide reductases (RNR) synthesize DNA building blocks de novo, making them crucial in DNA replication and drug targeting. FLARE introduces the first single‐tube real‐time coupled RNR assay, which enables isothermal tracking of RNR activity at nanomolar enzyme levels and allows the reconstruction of allosteric regulatory patterns and rapid ...
Jacopo De Capitani +4 more
wiley +1 more source