Results 21 to 30 of about 23,271,535 (305)

Publisher Correction: Chip-scale atomic diffractive optical elements

open access: yesNature Communications, 2019
An amendment to this paper has been published and can be accessed via a link at the top of the paper.
Liron Stern   +4 more
doaj   +1 more source

Recent Advances Concerning the 87Sr Optical Lattice Clock at the National Time Service Center

open access: yesApplied Sciences, 2018
We review recent experimental progress concerning the 87Sr optical lattice clock at the National Time Service Center in China. Hertz-level spectroscopy of the 87Sr clock transition for the optical lattice clock was performed, and closed-loop operation of
Yebing Wang   +4 more
doaj   +1 more source

Analysis of Narrow-Line Laser Cooling and Trapping of Sr Atoms in Microgravity Environments

open access: yesApplied Sciences, 2020
Obtaining ultracold alkaline earth(-like) atoms in space encounters the problem of performing narrow-line laser cooling in microgravity environments ( μ -gEs).
Jie Ren   +3 more
doaj   +1 more source

The weak frequency anomaly detection method of atomic clocks based on Kalman filter and extrapolation-accumulation

open access: yesMeasurement + Control, 2021
A new method based on the innovation of Kalman filter and extrapolation-accumulation is proposed to detect weak frequency anomalies in atomic clocks with short detection time and high detection probability. In this method, the detection statistics of the
Ran Yan   +4 more
doaj   +1 more source

Precision measurement of transverse velocity distribution of a strontium atomic beam

open access: yesAIP Advances, 2014
We measure the transverse velocity distribution in a thermal Sr atomic beam precisely by velocity-selective saturated fluorescence spectroscopy. The use of an ultrastable laser system and the narrow intercombination transition line of Sr atoms mean that ...
F. Gao   +7 more
doaj   +1 more source

International standards for pediatric palliative care: from IMPaCCT to GO-PPaCS.

open access: yesJournal of Pain and Symptom Management, 2022
CONTEXT Since the publication of the IMPaCCT project in 2007, much effort has been made to develop new approaches to pediatric palliative care (PPC). Fifteen years later, it is time to redefine the standards in PPC. OBJECTIVES An international group of
F. Benini   +18 more
semanticscholar   +1 more source

P-step Kalman-like unbiased FIR algorithm for detecting anomalies of atomic clocks

open access: yesMeasurement + Control, 2023
An extended measurement model anomaly detection algorithm for atomic clocks is proposed based on the p-step Kalman-like iterative Unbiased finite impulse response (UFIR) algorithm. The novel of the proposed algorithm is that it breaks the disadvantage of
Ran Yan   +3 more
doaj   +1 more source

Hybrid InP and SiN integration of an octave-spanning frequency comb

open access: yesAPL Photonics, 2021
Implementing optical-frequency combs with integrated photonics will enable wider use of precision timing signals. Here, we explore the generation of an octave-span, Kerr-microresonator frequency comb using hybrid integration of an InP distributed ...
Travis C. Briles   +9 more
doaj   +1 more source

Development of Analytical Methods for Calculating Time Standards for Shunting Operations

open access: yesNauka ta progres transportu, 2021
Purpose. The article is aimed to conduct a historical analysis of the development of analytical methods for standardizing the duration of shunting operations, as well as assessing their compliance with the existing operating conditions of railway ...
D. M Kozachenko   +2 more
doaj   +1 more source

Multi-dimensional data transmission using inverse-designed silicon photonics and microcombs

open access: yesNature Communications, 2022
The authors demonstrate a multi-dimensional communication scheme that combines wavelength- and mode- multiplexing on photonic integrated circuits using foundry-compatible photonic inverse design and spectrally flattened ...
Ki Youl Yang   +42 more
doaj   +1 more source

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