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36 results on '"Cheng, Si-Yuan"'

7. The ubiquitin‐binding protein MdRAD23D1 mediates drought response by regulating degradation of the proline‐rich protein MdPRP6 in apple ( Malus domestica )

Author

Zhang, Xiao‐Li, primary, Gong, Xiao‐Qing, additional, Su, Xin‐Jian, additional, Yu, Hai‐Xia, additional, Cheng, Si‐Yuan, additional, Huang, Jing‐Wen, additional, Li, Dan‐Yang, additional, Lei, Zhao‐Long, additional, Li, Ming‐jun, additional, and Ma, Feng‐wang, additional

Published
2023
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9. Stereo Matching Based On Election Campaign Algorithm

Author

Xie Qing Hua, Zhang Xiang Wei, Lv Wen Ge, and Cheng Si Yuan

Subjects
Stereo Matching, Energy Function, Election Campaign Algorithm, Optimization, Engineering (General). Civil engineering (General), TA1-2040
Abstract

Stereo matching is one of the significant problems in the study of the computer vision. By getting the distance information through pixels, it is possible to reproduce a three-dimensional stereo. In this paper, the edges are the primitives for matching, the grey values of the edges and the magnitude and direction of the edge gradient were figured out as the properties of the edge feature points, according to the constraints for stereo matching, the energy function was built for finding the route minimizing by election campaign optimization algorithm during the process of stereo matching was applied to this problem the energy function. Experiment results show that this algorithm is more stable and it can get the matching result with better accuracy.

Published
2016
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13. Structure prediction of CuBiI ternary compound and first-principles study of photoelectric properties

Author

Zeng Hang-Hang, Gong Yuan-Hao, Xie Cong-Wei, Wang Lan, Fan Xiao-Li, Zheng Zhi, and Cheng Si-Yuan

Subjects
chemistry.chemical_compound, Materials science, chemistry, Ternary compound, Structure (category theory), General Physics and Astronomy, Physical chemistry, Photoelectric effect
Abstract

Ternary metal halides have attracted much attention as a new potential photoelectric material due to their ultra-high photoelectric conversion efficiencies. In this paper, USPEX, a crystal structure prediction software based on genetic algorithm, is used to investigate the potential crystal structures of ternary CuBiI compounds (CuBi2I7, Cu2BiI5, Cu2BiI7,Cu3BiI6, Cu3Bi2I9, CuBi3I10, and Cu4BiI7) at atmospheric pressure and absolute zero temperature. Based on the density functional theory, the formation energies, elastic coefficients, and phonon dispersion curves of the predicted structures are calculated. The twelve stable CuBiI compounds with good thermodynamic, dynamical and mechanical stabilities are identified. The twelve crystal structures of CuBiI compound feature mainly the co-existence of Cu—I and Bi—I bonds and coordination polyhedrons of I atoms. The band gaps of twelve structures, calculated by HSE06 method, are 1.13–3.09 eV, indicating that the stoichiometric ratio affects the band gap obviously. Among them, the band gaps of Cu2BiI5-P1, Cu2BiI7-P1 and Cu2BiI7-P1-II are relatively small, close to the optimal band gap value for light absorption (1.40 eV), demonstrating that these compounds are suitable for serving as light absorbing materials in solar cells. The distribution of density of state (DOS) indicates that the top of the valence band of CuBiI compound is attributed to the hybridized Cu-3d and I-5p orbitals; the bottom of the conduction band of Cu3BiI6-R3 comes mainly from the Bi-6p and I-5p orbitals, and Cu-3d contributes little; the conduction band bottom of Cu2BiI7 is mainly from the I-5p orbital, and the Cu-3d has little contribution. The bottoms of the conduction band of other structures originate mainly from the hybridized Bi-6p and I-5p orbitals. Electronic localization function and Bader charge analysis show that the Cu—I and Bi—I bonds have more ionic features and less covalent natures. The DOS distribution also confirms the covalent interaction of Cu/Bi-I. In addition, the CuBiI ternary compounds have extremely strong light absorption capacities (light absorption coefficient higher than 4 × 105 cm–1) in the high-energy region of visible light and high power conversion efficiency (31.63%), indicating that the CuBiI ternary compounds have the potential to be an excellent photoelectric absorption material. Our investigation suggests the further study and potential applications of CuBiI ternary compound as absorber materials in solar cell.

Published
2021
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36. Review of Extracting the Centers of Linear Structured Light Stripes for 3D Visual Measurements.

Author

Yang Jian-hua, Yang Xue-rong, Cheng Si-yuan, Lei Zhi-sheng, Luo Shao-ming, and Zhang Xiang-wei

Subjects
IMAGING systems, UNDERWATER imaging systems, ERGONOMICS, ALGORITHMS, COMPUTATIONAL physics, LASER beams, EXTRACTION (Chemistry), INFORMATION resources management, THREE-dimensional imaging
Abstract

Extracting the center of a light stripe is one of the key techniques of the linear structured light for three-dimensional (3D) visual measurement. According to the influence of the accuracy in extracting the light stripe centers, the four key factors, which are the work environment, laser planes, measured ob-jects and image acquisition systems, are summed up and analyzed. On the basis of the diiferences be-tween the use of the image information and the characteristics of the calculated algorithms in the extraction methods, a new idea is proposed that they are classified into two diiferent methods, which are the geomet-rical center method and the energy center method. Based on the diiferences between the two methods in algorithm thoughts, merits and demerits, ways of improvement, applicable conditions, they are subcl--si-fied, compared, analyzed and summarized. At last, with the developing features of the two methods com-bined, it proposes the development trend of the light stripe extraction method. [ABSTRACT FROM AUTHOR]

Published
2014
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