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2,041 results on '"Wang, Xinqiang"'

155. DAFT-Net: Dual Attention and Fast Tongue Contour Extraction Using Enhanced U-Net Architecture.

Author

Wang, Xinqiang, Lu, Wenhuan, Liu, Hengxin, Zhang, Wei, and Li, Qiang

Subjects
*ENTROPY (Information theory), *TONGUE, *FEATURE selection, *VIDEO coding, *IMAGE segmentation, *INFORMATION theory
Abstract

In most silent speech research, continuously observing tongue movements is crucial, thus requiring the use of ultrasound to extract tongue contours. Precisely and in real-time extracting ultrasonic tongue contours presents a major challenge. To tackle this challenge, the novel end-to-end lightweight network DAFT-Net is introduced for ultrasonic tongue contour extraction. Integrating the Convolutional Block Attention Module (CBAM) and Attention Gate (AG) module with entropy-based optimization strategies, DAFT-Net establishes a comprehensive attention mechanism with dual functionality. This innovative approach enhances feature representation by replacing traditional skip connection architecture, thus leveraging entropy and information-theoretic measures to ensure efficient and precise feature selection. Additionally, the U-Net's encoder and decoder layers have been streamlined to reduce computational demands. This process is further supported by information theory, thus guiding the reduction without compromising the network's ability to capture and utilize critical information. Ablation studies confirm the efficacy of the integrated attention module and its components. The comparative analysis of the NS, TGU, and TIMIT datasets shows that DAFT-Net efficiently extracts relevant features, and it significantly reduces extraction time. These findings demonstrate the practical advantages of applying entropy and information theory principles. This approach improves the performance of medical image segmentation networks, thus paving the way for real-world applications. [ABSTRACT FROM AUTHOR]

Published
2024
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158. Air‐Promoted Light‐Driven Hydrogen Production from Bioethanol over Core/Shell Cr2O3@GaN Nanoarchitecture.

Author

Wang, Zhouzhou, Chen, Yiqing, Sheng, Bowen, Li, Jinglin, Yao, Lin, Yu, Ying, Song, Jun, Yu, Tianqi, Li, Yixin, Pan, Hu, Wang, Ping, Wang, Xinqiang, Zhu, Lei, and Zhou, Baowen

Subjects
HYDROGEN production, ETHANOL as fuel, ACTIVATION energy, CARBON offsetting, TURNOVER frequency (Catalysis), HYDROGEN evolution reactions
Abstract

Light‐driven hydrogen production from biomass derivatives offers a path towards carbon neutrality. It is often however operated with the limitations of sluggish kinetics and severe coking. Herein, a disruptive air‐promoted strategy is explored for efficient and durable light‐driven hydrogen production from ethanol over a core/shell Cr2O3@GaN nanoarchitecture. The correlative computational and experimental investigations show ethanol is energetically favorable to be adsorbed on the Cr2O3@GaN interface, followed by dehydrogenation toward acetaldehyde and protons by photoexcited holes. The released protons are then consumed for H2 evolution by photogenerated electrons. Afterward, O2 can be evolved into active oxygen species and promote the deprotonation and C−C cleavage of the key C2 intermediate, thus significantly lowering the reaction energy barrier of hydrogen evolution and removing the carbon residual with inhibited overoxidation. Consequently, hydrogen is produced at a high rate of 76.9 mole H2 per gram Cr2O3@GaN per hour by only feeding ethanol, air, and light, leading to the achievement of a turnover number of 266,943,000 mole H2 per mole Cr2O3 over a long‐term operation of 180 hours. Notably, an unprecedented light‐to‐hydrogen efficiency of 17.6 % is achieved under concentrated light illumination. The simultaneous generation of aldehyde from ethanol dehydrogenation enables the process more economically promising. [ABSTRACT FROM AUTHOR]

Published
2024
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159. Meso-damage behaviour of cement-stabilised macadam after long-time immersion based on particle flow theory.

Author

Zhao, Guofang, Luo, Chengcheng, Wu, Xiaoyong, Wang, Xinqiang, Yan, Yongkang, and Yan, Zhanyou

Subjects
GRANULAR flow, WATER immersion, WEIBULL distribution, PEAK load, TANGENTIAL force
Abstract

Water can cause a certain degree of damage to cement-stabilised macadam (CSM), and the degree of damage is greater if CSM is immersed in water for a long time. In order to study CSM damage after lengthy water immersion, a discrete-element model of CSM was established. The Weibull distribution function was used to simulate the heterogeneous contacts between particles. The parallel bond model was used to simulate the material constitutive relationship. The microscopic parameters of CSM were obtained by trial-and-error method. The stress–strain curve was obtained from immersion tests. The micromechanical behaviour of the CSM after immersion was analysed. The results showed that the contact area and strength of the CSM immersed for 30 days were, respectively, 31.4% and 46% less than those of the non-immersed macadam. The force chains between particles were evenly distributed. At peak loading, the normal contact force between particles was much larger than the tangential contact force, and the vertical force chain was much larger than the transverse force chain. The distributions of cementation energy, friction energy and impact energy were not uniform in the middle/peak loading stage. [ABSTRACT FROM AUTHOR]

Published
2024
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170. Stacking‐Controlled Growth of rBN Crystalline Films with High Nonlinear Optical Conversion Efficiency up to 1%

Author

Qi, Jiajie, primary, Ma, Chenjun, additional, Guo, Quanlin, additional, Ma, Chaojie, additional, Zhang, Zhibin, additional, Liu, Fang, additional, Shi, Xuping, additional, Wang, Li, additional, Xue, Mingshan, additional, Wu, Muhong, additional, Gao, Peng, additional, Hong, Hao, additional, Wang, Xinqiang, additional, Wang, Enge, additional, Liu, Can, additional, and Liu, Kaihui, additional

Published
2023
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175. Generation and Electric Control of Spin-Coupled Valley Current in WSe2

Author

Yuan, Hongtao, Wang, Xinqiang, Lian, Biao, Zhang, Haijun, Fang, Xianfa, Shen, Bo, Xu, Gang, Xu, Yong, Zhang, Shou-Cheng, Hwang, Harold Y., and Cui, Yi

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

The valley degree of freedom in layered transition-metal dichalcogenides (MX2) provides the opportunity to extend functionalities of novel spintronics and valleytronics devices. Due to spin splitting induced by spin-orbital coupling (SOC), the non-equilibrium charge carrier imbalance between two degenerate and inequivalent valleys to realize valley/spin polarization has been successfully demonstrated theoretically and supported by optical experiments. However, the generation of a valley/spin current by the valley polarization in MX2 remains elusive and a great challenge. Here, within an electric-double-layer transistor based on WSe2, we demonstrated a spin-coupled valley photocurrent whose direction and magnitude depend on the degree of circular polarization of the incident radiation and can be further greatly modulated with an external electric field. Such room temperature generation and electric control of valley/spin photocurrent provides a new property of electrons in MX2 systems, thereby enabling new degrees of control for quantum-confined spintronics devices., Comment: 21 pages, 5 figures

Published
2014
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