Results 61 to 70 of about 37,255 (283)

Design of a RF Switch Used in Redundant Atomic Clock Configurations

Sensors, 2019
Atomic clocks provide frequency reference signals for communication, aerospace, satellite navigation and other systems. The redundant configuration of atomic clocks is necessary for ensuring the continuity and stability of the system.
Yuqing Hou, Sangyuan Wang, Sheng Tang, Tao Zhang   +3 more
doaj   +1 more source

Miniature Optical Atomic Clock: Stabilization of a Kerr Comb Oscillator [PDF]

, 2013
Mechanical clocks consist of a pendulum and a clockwork that translates the pendulum period to displayed time. The most advanced clocks utilize optical transitions in atoms in place of the pendulum and an optical frequency comb generated by a femtosecond
Byrd, J., Eliyahu, D., Ilchenko, V. S., Liang, W., Maleki, L., Matsko, A. B., Savchenkov, A. A., Seidel, D.   +7 more
core  

Disordered but rhythmic—the role of intrinsic protein disorder in eukaryotic circadian timing

FEBS Letters, EarlyView.
Unstructured domains known as intrinsically disordered regions (IDRs) are present in nearly every part of the eukaryotic core circadian oscillator. IDRs enable many diverse inter‐ and intramolecular interactions that support clock function. IDR conformations are highly tunable by post‐translational modifications and environmental conditions, which ...
Emery T. Usher, Jacqueline F. Pelham
wiley   +1 more source

High-precision Frequency Drift Compensation Study of High-performance Rubidium Atomic Clock

Chinese Journal of Magnetic Resonance
With their high reliability, small size and low power consumption, rubidium atomic clocks are widely used in the fields of navigation, communication, etc. In particular, rubidium atomic clocks for navigation satellites have developed excellent stability.
XU Junqiu, LI Junyao, ZHAO Feng, KANG Songbai, Wang Pengfei, Ming Gang   +5 more
doaj   +1 more source

Deeply subrecoil two-dimensional Raman cooling

, 2004
We report the implementation of a two-dimensional Raman cooling scheme using sequential excitations along the orthogonal axes. Using square pulses, we have cooled a cloud of ultracold Cesium atoms down to an RMS velocity spread of 0.39(5) recoil velocity,
F. Bardou, L. J. Lising, S. L. Rolston, V. Boyer, W. D. Phillips   +4 more
core   +1 more source

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, Tanmay Kumar Mohanty, Rashna Bhandari, Dorothea Fiedler   +3 more
wiley   +1 more source

Mapping Out Atom-Wall Interaction with Atomic Clocks [PDF]

Physical Review Letters, 2009
We explore a feasibility of measuring atom-wall interaction using atomic clocks based on atoms trapped in engineered optical lattices. Optical lattice is normal to the wall. By monitoring the wall-induced clock shift at individual wells of the lattice, one would measure a dependence of the atom-wall interaction on the atom-wall separation.
Derevianko, A., Obreshkov, B., Dzuba, V. A.   +2 more
openaire   +3 more sources

Microchip-Based Trapped-Atom Clocks

, 2011
This is a chapter of a recently published book entitled Atom Chips, edited by Jakob Reichel and Vladan Vuletic. The contents of this chapter include: Basic Principles; Atomic-Fountain versus Trapped-Atom Clocks; Optical-Transition Clocks versus Microwave
Leroux, Ian D., Schleier-Smith, Monika H., Vuletic, Vladan   +2 more
core   +1 more source

The role of histone modifications in transcription regulation upon DNA damage

FEBS Letters, EarlyView.
This review discusses the critical role of histone modifications in regulating gene expression during the DNA damage response (DDR). By modulating chromatin structure and recruiting repair factors, these post‐translational modifications fine‐tune transcriptional programmes to maintain genomic stability.
Angelina Job Kolady, Siyao Wang
wiley   +1 more source

Effect of shield magnetization on variations in the frequency of onboard rubidium atomic clocks

St. Petersburg Polytechnical University Journal: Physics and Mathematics
In the paper, the results of a study of the influence of the magnetic shield magnetization on the relative frequency instability of small-sized rubidium atomic clocks have been presented.
Ermak Sergey, Semenov Vladimir, Baranov Alexey, Rogatin Maxim, Sergeeva Maria   +4 more
doaj   +1 more source