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3,882 results on '"Deng, Yuan"'

666. On‐Surface Synthesis of [3]Radialenes via [1+1+1] Cycloaddition

Author

Li, Deng‐Yuan, primary, Wang, Ying, additional, Hou, Xiao‐Yu, additional, Ren, Yin‐Ti, additional, Kang, Li‐Xia, additional, Xue, Fu‐Hua, additional, Zhu, Ya‐Cheng, additional, Liu, Jian‐Wei, additional, Liu, Mengxi, additional, Shi, Xing‐Qiang, additional, Qiu, Xiaohui, additional, and Liu, Pei‐Nian, additional

Published
2022
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676. Phylogeny and sex chromosome evolution of Palaeognathae

Author

Wang, Zongji, primary, Zhang, Jilin, additional, Xu, Xiaoman, additional, Witt, Christopher, additional, Deng, Yuan, additional, Chen, Guangji, additional, Meng, Guanliang, additional, Feng, Shaohong, additional, Xu, Luohao, additional, Szekely, Tamas, additional, Zhang, Guojie, additional, and Zhou, Qi, additional

Published
2022
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698. High-efficiency face detection and tracking method for numerous pedestrians through face candidate generation

Author

Guo Zhi-Bin, Chao-Ho Chen, Tsong-Yi Chen, Deng-Yuan Huang, Cheng-Kang Wen, and Wu-Chih Hu

Subjects
Computer Networks and Communications, business.industry, Computer science, Frame (networking), 020207 software engineering, 02 engineering and technology, Frame rate, Tracking (particle physics), Hardware and Architecture, Face (geometry), 0202 electrical engineering, electronic engineering, information engineering, Media Technology, Computer vision, Artificial intelligence, Enhanced Data Rates for GSM Evolution, business, Face detection, Software
Abstract

This paper is dedicated to developing high-efficiency face detection and tracking method for big dynamic crowds or numerous pedestrians. Three modules constitute the proposed method, i.e., face candidate generation, face candidate verification, and face target tracking. In this work, face candidates are localized using the features of the face area, edge information, and skin color. Non-face parts in the face candidates are further verified by the C-SVM learning model and then removed, by which the face targets can be generated with lower computation-complexity and satisfactory accuracy than other approaches. Finally, the face targets are tracked by an efficient and reliable searching scheme for improving the effective face detection rate. Experimental results show that the average face detection rate (FDR) of 85%, average effective FDR of 95%, a frame rate of 28–66 frames per second (fps), and about 30 faces detected per frame are obtained from various test videos with big dynamic crowds or numerous pedestrians, indicating the feasibility of the proposed method to achieve unconstrained face detection with high-efficiency and cost-effectiveness. This result makes the proposed method more attractive for the video surveillance system as compared to other approaches, especially in the high computational complexity-based methods.

Published
2020

699. Tuning Vinylethylene Carbonates into [4 + 2] Cycloaddition via Silylation and Vinylogous Peterson Elimination

Author

Wei Feng, Li Xu, Deng Yuan Li, and Pei Nian Liu

Subjects
chemistry.chemical_compound, Trimethylsilyl, Silylation, 010405 organic chemistry, Chemistry, Organic Chemistry, Physical and Theoretical Chemistry, 010402 general chemistry, 01 natural sciences, Biochemistry, Medicinal chemistry, Cycloaddition, 0104 chemical sciences
Abstract

Vinylethylene carbonates have been extensively used to trigger [3 + n] or [5 + n] cycloaddition via the formation of η3-allylic intermediates, while the important [4 + n] cycloaddition has not been explored yet. Here, we report a new strategy to convert vinylethylene carbonates into 4-(trimethylsilyl)but-2-en-1-ols, which can readily undergo [4 + 2] cycloaddition by in situ formation of 1,3-dienes. This novel reaction involves [PdII]-catalyzed decarboxylative silylation, [FeIII]-catalyzed vinylogous Peterson elimination, and subsequent [4 + 2] cycloaddition to afford a multisubstituted cyclohexa-1,4-diene skeleton.

Published
2020

700. Facile preparation and optical properties of Te/Pb-free Y3Al5O12:Ce3+ phosphor-in-glass via a screen-printing route for high-power WLEDs

Author

Tongxiang Liang, Xueli Yang, Ruixiang Wang, Deng Yuan, Yuanying Yue, Weixiong You, Yijun Zhuang, Libin Xia, and Chengyue Li

Subjects
010302 applied physics, Photoluminescence, Materials science, business.industry, Phosphor, 02 engineering and technology, Color temperature, 021001 nanoscience & nanotechnology, 01 natural sciences, Color rendering index, 0103 physical sciences, Screen printing, Materials Chemistry, Ceramics and Composites, Optoelectronics, Thermal stability, Quantum efficiency, 0210 nano-technology, business, Luminous efficacy
Abstract

The applications in high-power fields of white light-emitting diodes (WLEDs) are restricted due to their poor thermal stability. Transparent Y3Al5O12:Ce3+ phosphor-in-glass (YAG-PiG) provides an efficient way to resolve this problem. In this work, novel transparent Te/Pb-free YAG-PiGs are successfully prepared via a facile screen-printing route. It is revealed that 5 mol% Eu2O3 optimizes the concentration in substrate glass. Slight erosion of YAG particles occurs in the as-prepared samples. With increasing YAG concentration and film thickness, the intensities of photoluminescence spectra of YAG-PiGs increase. The energy transfer from Eu3+ to Ce3+ is greatly suppressed. Superior thermal stability and high quantum efficiency are obtained. The optimal optical performance values in terms of a luminous efficiency of 117.2 lm/W, a correlated color temperature of 5859 K and a color rendering index of 77.2 are achieved in YAG-PiGs. All of the results reveal that the as-prepared YAG-PiGs are promising candidates for high-power WLEDs.

Published
2019

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