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318 results on '"Ni, Wenjun"'

5. Lateral Control of Distributed Propulsion Aircraft Using Deep Reinforcement Learning

Author

Ni, Wenjun, Wu, Di, Ma, Xiaoping, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Möller, Sebastian, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Oneto, Luca, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, Zhang, Junjie James, Series Editor, Yan, Liang, editor, and Deng, Yimin, editor

Published
2023
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13. Fiber-Based Infrasound Sensing

Author

Wang, Shun, Ni, Wenjun, Zhang, Liang, Lu, Ping, Yang, Yaowen, Wei, Lei, Atai, Javid, Series Editor, Liang, Rongguang, Series Editor, Dinish, U.S., Series Editor, and Wei, Lei, editor

Published
2020
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17. Real-time spectral interferometry enables ultrafast acoustic detection

Author

Liu, Yusong, primary, Ni, Wenjun, additional, Yang, Liuyang, additional, Huang, Siyun, additional, Liu, Haoguang, additional, Sun, Yixiang, additional, Xia, Ran, additional, Yao, Yao, additional, Yan, Lisong, additional, Luo, Yiyang, additional, Xu, Zhilin, additional, Xu, Gang, additional, Sun, Qizhen, additional, Tang, Xiahui, additional, and Shum, Perry Ping, additional

Published
2023
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32. Toward efficient photochemistry from upper excited electronic states: Detection of long S2 lifetime of perylene.

Author

Ni, Wenjun, Gurzadyan, Gagik G., Sun, Licheng, and Gelin, Maxim F.

Subjects
*EXCITED states, *PERYLENE, *PHOTOCHEMISTRY
Abstract

A long 0.9 ps lifetime of the upper excited singlet state in perylene is resolved by femtosecond pump–probe measurements under ultraviolet (4.96 eV) excitation and further validated by theoretical simulations of transient absorption kinetics. This finding prompts exploration and development of novel perylene-based materials for upper excited state photochemistry applications. [ABSTRACT FROM AUTHOR]

Published
2021
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36. Numerical Modelling of the Optical–Acoustical Characterization of an Anti-Resonant Bragg Hollow Core Fiber.

Author

Shi, Ying, Zhou, Yilin, Ni, Wenjun, Tian, Yongsheng, Lian, Zhenggang, and Shum, Perry Ping

Subjects
HOLLOW fibers, PHOTOACOUSTIC effect, TRANSMISSION of sound, BRAGG gratings, ACOUSTIC imaging, PHOTOTHERMAL spectroscopy, ACOUSTIC wave propagation, PHOTOTHERMAL effect
Abstract

Anti-resonant hollow core fibers (AR-HCFs) provide a promising solution for photothermal spectroscopy and photoacoustic imaging applications. Here, the AR-HCF serves as a micro platform to induce the photothermal/photoacoustic effect. Since the Bragg structure can induce multiple AR effects compared with the general AR-HCF, we proposed a novel device, the AR-BHCF (AR-HCF with Bragg cladding), to enhance the excitation efficiency. The simulation and experimental results validate that the AR-BHCF dominates in having a stronger ability to confine the optical field in the air core indeed. Then, the acoustic signal stimulated by the photoacoustic effect will propagate along with the fiber axial, and part of it will penetrate out of the AR-BHCF. The results revealed that the transmission bandwidth of the acoustic wave in the AR-BHCF ranges from 1 Hz to 1 MHz, covering infrasound to ultrasound. In particular, a constant coefficient of 0.5 exists in the acoustic wave fading process, related to the propagation frequency and time. The acoustic signal can be monitored in real time, assisted by the ultra-highly sensitive sensor head. Therefore, BHCF-based devices combined with photoacoustic techniques may accelerate their sensing applications. Meanwhile, this scheme shines a light on the theoretical foundation of novel short-haul distributed acoustic sensing. [ABSTRACT FROM AUTHOR]

Published
2023
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