Results 51 to 60 of about 40,348 (331)
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
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Experimental Evaluation of the Blackbody Radiation Shift in the Cesium Atomic Fountain Clock
Applied Sciences, 2022 The cesium atomic fountain clock is the world’s most accurate microwave atomic clock. The uncertainty of blackbody radiation (BBR) shift accounts for an increasingly large percentage of the uncertainty associated with fountain clocks and has become a key
Fan Yang +10 more
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Protein pyrophosphorylation by inositol pyrophosphates — detection, function, and regulation
FEBS Letters, EarlyView.Protein pyrophosphorylation is an unusual signaling mechanism that was discovered two decades ago. It can be driven by inositol pyrophosphate messengers and influences various cellular processes. Herein, we summarize the research progress and challenges of this field, covering pathways found to be regulated by this posttranslational modification as ...
Sarah Lampe +3 more
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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
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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.
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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
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Multiple ETS family transcription factors bind mutant p53 via distinct interaction regions
FEBS Letters, EarlyView.Mutant p53 gain‐of‐function is thought to be mediated by interaction with other transcription factors. We identify multiple ETS transcription factors that can bind mutant p53 and found that this interaction can be promoted by a PXXPP motif. ETS proteins that strongly bound mutant p53 were upregulated in ovarian cancer compared to ETS proteins that ...
Stephanie A. Metcalf +6 more
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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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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Measurement and Analysis of Atomic Relaxation Time in Active Hydrogen Atomic Clocks
Chinese Journal of Magnetic Resonance, 2022 The atomic relaxation time of a hydrogen atomic clock is the time required for atomic system after the selected state removing the atoms of the ground state hyperfine energy level (F = 0, mF = 0) and (F = 1, mF = −1) state to change from the (F = 1, mF =
LIANG Yue, XIE Yong-hui, CHEN Peng-fei
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