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326 results on '"Gui, Yingang"'

23. Effects of Water Absorption on the Insulating Properties of Polypropylene.

Author

Xi, Rui, Jiang, Qiyang, Cao, Liang, Li, Chuping, He, Jiaxun, Zhang, Ya, He, Gaohui, Gui, Yingang, and Tang, Chao

Subjects
PERMITTIVITY, X-ray spectra, INFRARED spectra, X-ray diffraction, POLYPROPYLENE
Abstract

Moisture has been a crucial problem during the operation of cable systems. When we are faced with polypropylene (PP)-based insulation for the development of cable systems, there are few reports on the effects of water intrusion on the electrical performances of PP. In this study, the water absorption characteristics of isotactic PP (iPP) and atactic PP (aPP), as well as their effects on volume resistivity and relative permittivity, were investigated. The structure evolution during the water absorption process of the two PPs was also compared via infrared spectra and X-ray diffraction analyses. The results show that both of the two PPs show a saturation of water absorption at ~216 h, even though there are structural differences. And water intrusion into bulk could increase the interplanar spacing of iPP while decreasing the interplanar spacing of aPP. Moreover, with the increase in water absorption, the volume resistivity of the two PPs show a decreasing trend while the relative permittivity presents an increasing behavior, which shows an almost linear correlation. [ABSTRACT FROM AUTHOR]

Published
2024
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37. Ultraflexible, High-Stability Woven Yarn Sensors With a Wide Detection Range for Enhanced Human-Machine Interaction

Author

Song, Linlong, Yang, Ping-An, Ding, Yifan, Mo, Chunyan, Yang, Yingtian, Gui, Yingang, Shao, Yiqian, and Chen, Qiao

Abstract

Flexible sensors play a crucial role in enhancing information transmission and human-machine control efficiency, particularly in challenging environments such as nighttime or dusty conditions encountered in counter-terrorism operations. Combining high stability sensing performance and exceptional flexibility is paramount for effective human-machine interaction facilitated by flexible sensors. Finding a balance between high flexibility, wide detection range, and stability is challenging because they are mutually limiting. In this study, a latex-polyester core-spun elastic yarn with a double-helix structure was used, using a dip-coating process to apply two layers of MWCNTs and one layer of PEDOT:PSS, aiming to enhance the detection range and stability of sensors. The developed yarn sensor exhibited a low modulus (0.09 MPa), a wide detection range (0.025%–200%), and high stability (>20000 cycles). Its flexibility surpassed that of human skin, demonstrating excellent stability under varying rates, strain ranges, and sample lengths. Integration of the yarn sensor into sensing gloves facilitated natural gesture recognition in counter-terrorism operations and enabled successful control of unmanned counter-terrorism vehicles, thereby enhancing human-machine interaction. This innovative solution presents significant potential for enhancing the efficiency and accuracy of counter-terrorism operations through improved sensing capabilities.

Published
2024
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38. Gas-Sensing Performance of Metal Oxide Heterojunction Materials for SF 6 Decomposition Gases: A DFT Study.

Author

Zeng, Tingting, Ma, Donglin, and Gui, Yingang

Subjects
FRONTIER orbitals, ELECTRIC conductivity, GAS absorption & adsorption, DENSITY of states, GAS detectors, HETEROJUNCTIONS
Abstract

The online monitoring of GIS equipment can be realized through detecting SF6 decomposition gasses. Metal oxide heterojunctions are widely used as gas-sensing materials. In this study, the structural and electrical properties of In2O3-ZnO and TiO2-ZnO heterojunctions were analyzed based on density functional theory calculations. After heterojunction structural optimization, the electrical conductivity of these two heterojunctions was enhanced compared to each intrinsic model, and the electrical conductivity is ranked as follows: In2O3-ZnO heterojunction > TiO2-ZnO heterojunction. The gas-sensing response of these two heterojunctions to four SF6 decomposition gasses, H2S, SO2, SOF2, and SO2F2, was investigated. For gas adsorption systems, the adsorption energy, charge transfer, density of states, charge difference density, and frontier molecular orbitals were calculated to analyze the adsorption and gas-sensing performance. For gas adsorption on the In2O3-ZnO heterojunction surface, the induced conductivity changes are in the following order: H2S > SO2F2 > SOF2 > SO2. For gas adsorption on the TiO2-ZnO heterojunction surface, H2S and SOF2 increase conductivity, and SO2 and SO2F2 decrease conductivity. [ABSTRACT FROM AUTHOR]

Published
2024
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