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286 results on '"Zhang, Wuyuan"'

15. Size-dependent thermomechanical vibrations in rotating pre-twisted porous functionally graded thick microplates.

Author

Zhang, Wuyuan, Zhang, Bo, Jin, Songye, Shen, Huoming, and Li, Cheng

Subjects
*STRAINS & stresses (Mechanics), *SHEAR (Mechanics), *MICRO air vehicles, *EQUATIONS of motion, *MICROELECTROMECHANICAL systems
Abstract

In this study, a thermomechanical rigid-flexible coupling vibration model of the rotating pre-twisted porous functionally graded (PP-FG) thick microplate in a thermal environment is established based on the third-order shear deformation theory (TSDT) and modified couple stress theory (MCST). Three thermal distributions are considered. The effects of temperature and porosity on the equivalent material parameters are accounted for in the modified Voigt rule of mixture. The governing equations of motion are derived using the Euler–Lagrange equation and numerically solved through the complex modal analysis method and the Chebyshev–Ritz method. After validating the convergence and accuracy of the proposed model, the effects of temperature, material length scale parameter (MLSP), rotational speed, porosity index, gradient index, presetting angle, and pre-twist angle on the vibration behavior of microplates were examined. The key findings of the study are as follows: (1) The effects of rotational speed on in-plane and out-of-plane frequencies are opposite. Temperature elevation weakens the size effect and centrifugal stiffening effect on the frequencies. (2) The effects of the porosity index on the frequencies are the opposite when the gradient index exceeds a specific critical value. (3) The effects of the presetting angle on the frequencies are periodic and symmetrical at about 0. The frequencies reach an extreme value when the pre-twist angle is approximately 2π/3 for the cantilever microplate. The proposed model is more sophisticated and comprehensive than others reported in the literature. It offers a more thorough analysis and insight into the behavior and performance of micro-electro-mechanical systems (MEMS) and micro air vehicles (MAVs), particularly when operating in challenging conditions. [ABSTRACT FROM AUTHOR]

Published
2024
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23. Peroxygenase‐Catalysed Sulfoxidations in Non‐Aqueous Media.

Author

Li, Huanhuan, Shen, Qianqian, Zhou, Xiaoying, Duan, Peigao, Hollmann, Frank, Huang, Yawen, and Zhang, Wuyuan

Abstract

Chiral sulfoxides are valuable building blocks in asymmetric synthesis. However, the biocatalytic synthesis of chiral sulfoxides is still challenged by low product titres. Herein, we report the use of peroxygenase as a catalyst for asymmetric sulfoxidation under non‐aqueous conditions. Upon covalent immobilisation, the peroxygenase showed stability and activity under neat reaction conditions. A large variety of sulfides was converted into chiral sulfoxides in very high product concentration with moderate to satisfactory optical purity (e. g. 626 mM of (R)‐methyl phenyl sulfoxide in approx. 89 % ee in 48 h). Further polishing of the ee value via cascading methionine reductase A (MsrA) gave>99 % ee of the sulfoxide. The robustness of the enzymes and high product titer is superior to the state‐of‐the‐art methodologies. Gram‐scale synthesis has been demonstrated. Overall, we demonstrated a practical and facile catalytic method to synthesize chiral sulfoxides. [ABSTRACT FROM AUTHOR]

Published
2024
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33. Engineering a Highly Regioselective Fungal Peroxygenase for the Synthesis of Hydroxy Fatty Acids

Author

Gomez de Santos, Patricia, primary, González‐Benjumea, Alejandro, additional, Fernandez‐Garcia, Angela, additional, Aranda, Carmen, additional, Wu, Yinqi, additional, But, Andrada, additional, Molina‐Espeja, Patricia, additional, Maté, Diana M., additional, Gonzalez‐Perez, David, additional, Zhang, Wuyuan, additional, Kiebist, Jan, additional, Scheibner, Katrin, additional, Hofrichter, Martin, additional, Świderek, Katarzyna, additional, Moliner, Vicent, additional, Sanz‐Aparicio, Julia, additional, Hollmann, Frank, additional, Gutiérrez, Ana, additional, and Alcalde, Miguel, additional

Published
2023
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37. H2O2-driven enzymatic oxyfunctionalization of tertiary C–H bonds.

Author

Huang, Yawen, Li, Huanhuan, Zhang, Pengpeng, Zhang, Yalan, Duan, Peigao, and Zhang, Wuyuan

Subjects
TURNOVER frequency (Catalysis), ACYLOINS, GLYCOLS, HYDROXYLATION
Abstract

Peroxygenase from Agrocybe aegerita catalyses the selective hydroxylation of tertiary C–H bonds, whereby tertiary alcohols, diols, ketols, etc., were obtained in good to high regioselectivity and turnover numbers. This method can also be expanded for late-stage functionalization of drug molecules, which represents a streamlined synthetic method to give access to useful compounds. [ABSTRACT FROM AUTHOR]

Published
2023
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48. Whole‐Cell Biotransformation of Penicillin G by a Three‐Enzyme Co‐expression System with Engineered Deacetoxycephalosporin C Synthase

Author

Song, Shiyi, primary, Jiang, Yingying, additional, Chen, Ruidong, additional, Su, Wencheng, additional, Liang, Weinan, additional, Yang, Dameng, additional, Li, Jincheng, additional, Zhang, Wuyuan, additional, Gao, Shushan, additional, Yuan, Bo, additional, Qu, Ge, additional, and Sun, Zhoutong, additional

Published
2022
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