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38 results on '"Wang, Deyang"'

1. Improvement of image-type very-low-energy-electron-diffraction spin polarimeter

Author

Zha, Heming, Liu, Wenjing, Wang, Deyang, Zhao, Bo, Shen, XiaoPing, Ye, Mao, and Qiao, Shan

Subjects
Physics - Instrumentation and Detectors, Condensed Matter - Materials Science
Abstract

Spin- and angle-resolved photoemission spectroscopy (SARPES) with high efficiency and resolution plays a crucial role in exploring the fine spin-resolved band structures of quantum materials. Here we report the performance of SARPES instrument with a second-generation home-made multichannel very-low-energy-electron-diffraction (VLEED) spin polarimeter. Its energy and angular resolutions achieve 7.2 meV and 0.52{\deg}. We present the results of SARPES measurements of Bi(111) film to demonstrate its performance. Combined with the density functional theory (DFT) calculations, the spin polarization of the bulk states was confirmed from the spin-layer locking caused by the local inversion asymmetry. The surface states at binding energy of 0.77 eV are found with 1.0 {\pm} 0.11 spin polarization. The better resolutions and stability compared with the first-generation one provide a good platform to investigate the spin-polarized electronic states in materials., Comment: 4 pages, 4 figures

Published
2023
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14. Continuous Wave Mode Test of Conduction-Cooled Nb 3 Sn Radio Frequency Superconducting Cavities at Peking University.

Author

Ren, Manqian, Lin, Lin, Hao, Jiankui, Wang, Gai, Wang, Ziyu, Wang, Deyang, Shen, Haoyu, Quan, Shengwen, Wang, Fang, Feng, Liwen, Jiao, Fei, Zhu, Feng, Zhu, Kun, Yan, Xueqing, and Huang, Senlin

Subjects
THERMAL electrons, RADIO frequency, CONDUCTION electrons, ELECTRON accelerators, METALLIC films
Abstract

A liquid helium-free cryostat for radio frequency (RF) test of the superconducting cavity is designed and constructed. Gifford-Mcmahon (G-M) cryocoolers are used to provide cooling capacity, and the heat leakage at 4 K is less than 0.02 W. Vertical and horizontal tests of two Nb3Sn cavities are carried out in the cryostat with different surface treatments outside the cavities. Both of the cavities achieve stable continuous wave (CW) operation. A novel treatment, which cold-sprayed a 3.5 mm thick Cu layer onto the outside of the cavity, enables the maintenance of an average temperature of 5.5 K in the cavity at a RF loss of 10 W, implying that the thermal stability and uniformity of the cavity has been significantly improved. Through the synergistic control of four metal film resistors, a cooling rate of 0.06 K/min near 18 K is realized, and the cavity temperature gradient is reduced to 0.17 K/m, which effectively improves the RF performance of the cavity. The maximum E a c c of the cavity reaches 3.42 MV/m, and the Q 0 is 1.1 × 109. An electromagnetic–thermal coupling simulation model for the superconducting cavity is established and is in good agreement with the experimental results. The simulation results show that the cavity with a Cu-spraying treatment and the thermal links of 5N Al can satisfy the E a c c of 10 MV/m under conduction cooling. [ABSTRACT FROM AUTHOR]

Published
2024
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17. Rücktitelbild: Metal‐Organic Framework Supported Copper Photoredox Catalysts for Iminyl Radical‐Mediated Reactions (Angew. Chem. 21/2023)

Author

Ma, Ben, primary, Xia, Qi, additional, Wang, Deyang, additional, Jin, Ji‐Kang, additional, Li, Zekun, additional, Liang, Qiu‐Jiang, additional, Sun, Meng‐Ying, additional, Liu, Dongyi, additional, Liu, Li‐Juan, additional, Shu, Hui‐Xing, additional, Yang, Jun, additional, Li, Dan, additional, and He, Jian, additional

Published
2023
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18. Back Cover: Metal‐Organic Framework Supported Copper Photoredox Catalysts for Iminyl Radical‐Mediated Reactions (Angew. Chem. Int. Ed. 21/2023)

Author

Ma, Ben, primary, Xia, Qi, additional, Wang, Deyang, additional, Jin, Ji‐Kang, additional, Li, Zekun, additional, Liang, Qiu‐Jiang, additional, Sun, Meng‐Ying, additional, Liu, Dongyi, additional, Liu, Li‐Juan, additional, Shu, Hui‐Xing, additional, Yang, Jun, additional, Li, Dan, additional, and He, Jian, additional

Published
2023
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24. Topological surface states in superconducting CaBi2

Author

Jiang, Qi, primary, Wang, Deyang, additional, Liu, Zhengtai, additional, Jiang, Zhicheng, additional, Qian, Haoji, additional, Shen, Xiaoping, additional, Li, Ang, additional, Shen, Dawei, additional, Qiao, Shan, additional, and Ye, Mao, additional

Published
2021
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25. Post-operative blood pressure and 3-year major adverse cardiac events in Chinese patients undergoing PCI

Author

Gan, Lijun, primary, Sun, Dandan, additional, Cheng, Yuntao, additional, Wang, Deyang, additional, Wang, Fen, additional, Wang, Lin, additional, Li, Wei, additional, Shen, Dandan, additional, Guo, Daotong, additional, Zhang, Zonglei, additional, Wang, Haiyan, additional, Li, Jinli, additional, Yang, Yong, additional, and Liang, Tao, additional

Published
2021
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26. Post-Operative Blood Pressure in 24 Hours and 3-Year Major Adverse Cardiac Events in Chinese Patients Undergoing PCI

Author

Gan, Lijun, primary, Sun, Dandan, additional, Cheng, Yuntao, additional, Wang, Deyang, additional, Wang, Fen, additional, Wang, Lin, additional, Li, Wei, additional, Shen, Dandan, additional, Guo, Daotong, additional, Zhang, Zonglei, additional, Wang, Haiyan, additional, Li, Jinli, additional, Yang, Yong, additional, and Liang, Tao, additional

Published
2021
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27. High-Performance Foam-Shaped Strain Sensor Based on Carbon Nanotubes and Ti3C2Tx MXene for the Monitoring of Human Activities

Author

Wang, Hongchen, primary, Zhou, Ruicong, additional, Li, Donghai, additional, Zhang, Linrong, additional, Ren, Guozhang, additional, Wang, Li, additional, Liu, Jinhua, additional, Wang, Deyang, additional, Tang, Zhenhua, additional, Lu, Gang, additional, Sun, Gengzhi, additional, Yu, Hai-Dong, additional, and Huang, Wei, additional

Published
2021
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33. High-Performance Foam-Shaped Strain Sensor Based on Carbon Nanotubes and Ti3C2TxMXene for the Monitoring of Human Activities

Author

Wang, Hongchen, Zhou, Ruicong, Li, Donghai, Zhang, Linrong, Ren, Guozhang, Wang, Li, Liu, Jinhua, Wang, Deyang, Tang, Zhenhua, Lu, Gang, Sun, Gengzhi, Yu, Hai-Dong, and Huang, Wei

Abstract

The flexible strain sensor is of significant importance in wearable electronics, since it can help monitor the physical signals from the human body. Among various strain sensors, the foam-shaped ones have received widespread attention owing to their light weight and gas permeability. However, the working range of these sensors is still not large enough, and the sensitivity needs to be further improved. In this work, we develop a high-performance foam-shaped strain sensor composed of Ti3C2TxMXene, multiwalled carbon nanotubes (MWCNTs), and thermoplastic polyurethane (TPU). MXene sheets are adsorbed on the surface of a composite foam of MWCNTs and TPU (referred to as TPU/MWCNTs foam), which is prefabricated by using a salt-templating method. The obtained TPU/MWCNTs@MXene foam works effectively as a lightweight, easily processable, and sensitive strain sensor. The TPU/MWCNTs@MXene device can deliver a wide working strain range of ∼100% and an outstanding sensitivity as high as 363 simultaneously, superior to the state-of-the-art foam-shaped strain sensors. Moreover, the composite foam shows an excellent gas permeability and suitable elastic modulus close to those of skin, indicating its being highly comfortable as a wearable sensor. Owing to these advantages, the sensor works effectively in detecting both subtle and large human movements, such as joint motion, finger motion, and vocal cord vibration. In addition, the sensor can be used for gesture recognition, demonstrating its perspective in human—machine interaction. Because of the high sensitivity, wide working range, gas permeability, and suitable modulus, our foam-shaped composite strain sensor may have great potential in the field of flexible and wearable electronics in the near future.

Published
2021
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37. Experimental Study of Multiple Physical Properties of Tectonic Coal near a Minor Fault: Implications for Coal and Gas Outburst

Author

Wang, Deyang, Cheng, Yuanping, Yuan, Liang, Wang, Liang, and Zhou, Hongxing

Abstract

Coal and gas outburst accidents often have occurred in minor faults and thick coal strips in recent years, which makes outbursts inseparable from geological structures or tectonic coal. In this paper, the coal samples near a minor fault were selected on the outburst belt, and the samples’ basic physical properties, coal fragmentation, pore structure, and gas desorption were tested. The fractal characteristics of the samples before and after crushing were innovatively compared and analyzed. The desorbed gas expansion energy and outburst potential were accurately obtained based on the particle size distribution and the gas desorption of the samples with different grain sizes. The results show that the samples have apparent fractal characteristics, and the two fractal dimensions have an obvious linear correlation, which can somewhat characterize coal fragmentation. The fault significantly increases the pore volume and specific surface area of macropores and mesopores in coal and has less influence on micropores. From 12 m outside toward the fault center, the developed macropores increase the initial gas desorption rate by 2.11–3.11 times and the first 40 s desorption volume by 1.31–2.01 times. The desorbed gas expansion energy varies from 80.70 to 383.18 kJ/m3, with the DF-0 sample being the largest and the DF-12 sample being the smallest. Overall, the coal fragmentation, gas desorption, and outburst energy show a rapid decrease first and then a slight fluctuation from the fault center to the edge. The coal body is characterized by weak fragmentation, low pore abundance, and weak gas desorption near 12 m of the fault, which traps high gas-bearing coal well and increases outburst risk near the fault center. Therefore, it is significant for precise gas extraction and outburst prevention in the fault zone.

Published
2023
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38. High-Performance Foam-Shaped Strain Sensor Based on Carbon Nanotubes and Ti 3 C 2 T x MXene for the Monitoring of Human Activities.

Author

Wang H, Zhou R, Li D, Zhang L, Ren G, Wang L, Liu J, Wang D, Tang Z, Lu G, Sun G, Yu HD, and Huang W

Subjects
Human Activities, Humans, Monitoring, Physiologic, Titanium, Nanotubes, Carbon, Wearable Electronic Devices
Abstract

The flexible strain sensor is of significant importance in wearable electronics, since it can help monitor the physical signals from the human body. Among various strain sensors, the foam-shaped ones have received widespread attention owing to their light weight and gas permeability. However, the working range of these sensors is still not large enough, and the sensitivity needs to be further improved. In this work, we develop a high-performance foam-shaped strain sensor composed of Ti 3 C 2 T x MXene, multiwalled carbon nanotubes (MWCNTs), and thermoplastic polyurethane (TPU). MXene sheets are adsorbed on the surface of a composite foam of MWCNTs and TPU (referred to as TPU/MWCNTs foam), which is prefabricated by using a salt-templating method. The obtained TPU/MWCNTs@MXene foam works effectively as a lightweight, easily processable, and sensitive strain sensor. The TPU/MWCNTs@MXene device can deliver a wide working strain range of ∼100% and an outstanding sensitivity as high as 363 simultaneously, superior to the state-of-the-art foam-shaped strain sensors. Moreover, the composite foam shows an excellent gas permeability and suitable elastic modulus close to those of skin, indicating its being highly comfortable as a wearable sensor. Owing to these advantages, the sensor works effectively in detecting both subtle and large human movements, such as joint motion, finger motion, and vocal cord vibration. In addition, the sensor can be used for gesture recognition, demonstrating its perspective in human-machine interaction. Because of the high sensitivity, wide working range, gas permeability, and suitable modulus, our foam-shaped composite strain sensor may have great potential in the field of flexible and wearable electronics in the near future.

Published
2021
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