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5 results on '"Peng, Cheng-Quan"'

3. Study of optical clocks based on ultracold 171Yb atoms*

Author

Ai, Di, primary, Qiao, Hao, additional, Zhang, Shuang, additional, Luo, Li-Meng, additional, Sun, Chang-Yue, additional, Zhang, Sheng, additional, Peng, Cheng-Quan, additional, Qi, Qi-Chao, additional, Jin, Tao-Yun, additional, Zhou, Min, additional, and Xu, Xin-Ye, additional

Published
2020
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4. Transient behavior of shock train with and without controlling

Author

Noor A. Ahmed, Shi he Yi, Zhi Chen, Peng cheng Quan, and Xiao ping Kong

Subjects
Fluid Flow and Transfer Processes, Physics, Flow control (data), Flow visualization, Mechanical Engineering, General Chemical Engineering, Acoustics, education, Isolator, Aerospace Engineering, Vortex generator, Moving shock, law.invention, Shock (mechanics), Pressure measurement, Nuclear Energy and Engineering, law, Transient (oscillation)
Abstract

The present paper is a study of the transient behavior of shock train in a constant area isolator with and without controlling method. Two kinds of vortex generators were installed and tested. Planar laser scattering technique was performed to study the three dimensional structure of the shock train and its temporal evolution. High frequency pressure measurements were conducted to reveal the shock train movement and its frequency-domain feature. Three states of the shock train during its formation and movement were revealed based on the wavelet decomposition. The shock train location and its movements were detected by method of integral of pressure derivative and wavelet decomposition. And based on the comparison of the flow structures, shock train movements and the pressure recovery effect, a recommendation of applying passive control method for the isolator was proposed.

Published
2015

5. Study of optical clocks based on ultracold 171Yb atoms.

Author

Ai, Di, Qiao, Hao, Zhang, Shuang, Luo, Li-Meng, Sun, Chang-Yue, Zhang, Sheng, Peng, Cheng-Quan, Qi, Qi-Chao, Jin, Tao-Yun, Zhou, Min, and Xu, Xin-Ye

Subjects
ULTRACOLD molecules, ATOMIC clocks, ATOMS, OPTICAL lattices, QUESTIONING
Abstract

The optical atomic clocks have the potential to transform global timekeeping, relying on the state-of-the-art accuracy and stability, and greatly improve the measurement precision for a wide range of scientific and technological applications. Herein we report on the development of the optical clock based on 171Yb atoms confined in an optical lattice. A minimum width of 1.92-Hz Rabi spectra has been obtained with a new 578-nm clock interrogation laser. The in-loop fractional instability of the 171Yb clock reaches 9.1 × 10−18 after an averaging over a time of 2.0 × 104 s. By synchronous comparison between two clocks, we demonstrate that our 171Yb optical lattice clock achieves a fractional instability of. [ABSTRACT FROM AUTHOR]

Published
2020
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