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- 저자 : Qiankun Zhu (검색결과 5 건)
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Qiankun Zhu,Xiaoli Hui,Nana Nan,Yongfeng Du 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.5
Due to the complexity and randomness of the crowd motion, it is not easy to establish the crowd-structure coupled governing equation. Therefore, the idea of the solution procedure for the coupled system of the single pedestrian and structure is extended to carry out the research of crowd-structure coupled system. Then based on the social force model and the deceleration mechanism aswell as the self-stopped mechanism, the one-way pedestrian flow is simulated. The modified Differential Quadrature-Integral Quadrature (DQ-IQ) mixed method is used to solve the dynamic response of the structure under the moving stiffness-mass-damping model, which can demonstrate this method enjoys higher accuracy than the mode superposition method and can take enough higher modes into consideration. Additionally, the fact that the DQ-IQ mixed method can be used to solve the dynamic response of the structure subjected to the crowd is verified. The final results under random crowd show that the varying tendencies of structural modal parameters respectively changed with the the number of pedestrian acting on the structure, In order to more comprehensively and more scientifically measure the vibration function of the structure, the 1 s-RMS acceleration is introduced to weaken the interference effect of random fluctuation.
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A full path assessment approach for vibration serviceability and vibration control of footbridges
Qiankun Zhu,Xiaoli Hui,Yongfeng Du,Qiong Zhang 국제구조공학회 2019 Structural Engineering and Mechanics, An Int'l Jou Vol.70 No.6
Most of the existing evaluation criteria of vibration serviceability rely on the peak acceleration of the structure rather than that of the people keeping their own body unmoved on the structure who is the real receiver of structural vibrations. In order to accurately assess the vibration serviceability, therefore, a full path assessment approach of vibration serviceability based on vibration source, path and receiver is not only tentatively proposed in this paper, taking the peak acceleration of receiver into account, but also introduce a probability procedure to provide more instructive information instead of a single value. In fact, semi-rigid supported on both sides of the structure is more consistent with the actual situation than simply supported or clamped due to the application of the prefabricated footbridge structures. So, the footbridge is regarded as a beam with semi-rigid supported on both sides in this paper. The differential quadrature-integral quadrature coupled method is not only to handle different type of boundary conditions, but also after being further modified via the introduction of an approximation procedure in this work, the time-varying system problem caused by human-structure interaction can be solved well. The analytical results of numerical simulations demonstrate that the modified differential quadrature-integral quadrature coupled method has higher reliability and accuracy compared with the mode superposition method. What’s more, both of the two different passive control measures, the tuned mass damper and semi-rigid supported, have good performance for reducing vibrations. Most importantly, semi-rigid supported is easier to achieve the objective of reducing vibration compared with tuned mass damper in design stage of structure.
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Zhu, Qiankun,Zhu, Mengli,Fan, Gaotao,Zou, Jiaxin,Feng, Peichun,Liu, Zubi,Wang, Wanjun Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.1
Coptis chinensis 3'-hydroxy-N-methylcoclaurine 4'-O-methyltransferase (HOMT), an essential enzyme in the berberine biosynthetic pathway, catalyzes the methylation of 3'-hydroxy-N-methylcoclaurine (HMC) producing reticuline. A 3D model of HOMT was constructed by homology modeling and further subjected to docking with its ligands and molecular dynamics simulations. The 3D structure of HOMT revealed unique structural features which permitted the methylation of HMC. The methylation of HMC was proposed to proceed by deprotonation of the 4'-hydroxyl group via His257 and Asp258 of HOMT, followed by a nucleophilic attack on the SAM-methyl group resulting in reticuline. HOMT showed high substrate specificity for methylation of HMC. The study evidenced that Gly117, Thr312 and Asp258 in HOMT might be the key residues for orienting substrate for specific catalysis.
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Qiankun Zhu,Mengli Zhu,Gaotao Fan,Jiaxin Zou,Peichun Feng,Zubi Liu,Wanjun Wang 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.1
Coptis chinensis 3'-hydroxy-N-methylcoclaurine 4'-O-methyltransferase (HOMT), an essential enzyme in the berberine biosynthetic pathway, catalyzes the methylation of 3'-hydroxy-N-methylcoclaurine (HMC) producing reticuline. A 3D model of HOMT was constructed by homology modeling and further subjected to docking with its ligands and molecular dynamics simulations. The 3D structure of HOMT revealed unique structural features which permitted the methylation of HMC. The methylation of HMC was proposed to proceed by deprotonation of the 4'-hydroxyl group via His257 and Asp258 of HOMT, followed by a nucleophilic attack on the SAM-methyl group resulting in reticuline. HOMT showed high substrate specificity for methylation of HMC. The study evidenced that Gly117, Thr312 and Asp258 in HOMT might be the key residues for orienting substrate for specific catalysis.
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Ning Guan,Xiang Gao,Feng Chen,Qiankun Zhu 한양대학교 청정에너지연구소 2023 Journal of Ceramic Processing Research Vol.24 No.1
For the anti-icing technology of hydrophobic coating on turbine blades, the influence of the hydrophobic surface withmicropatterns on the impact characteristics of water droplets is studied in present manuscript. The spreading and retractioncharacteristics of water droplets with diameters of 2~10 μm on micro-structured surface is numerically investigated in presentresearch by volume of fluid (VOF) and Level-set coupling method, and the influence of surface micropattern geometry andwater droplet diameter on the spreading and retraction process is analyzed in detail. It is found that the ratio of water dropletdiameter D0 to micropattern size P has a significant effect on the dynamic process and final shape of the impact on the samemicropatterned wall; and the surface shows obvious hydrophobicity when the ratio of water droplet diameter D0 tomicropattern size P is 2 ≤ D0/P ≤ 4 and the movement of water droplets on the surface is in accordance with the descriptionof the Cassie model, although the contact angle of substrate material is 86°. However, the dynamic process and final shape ofwater droplets are similar to those on a smooth plane with the contact angle of 86° when D0/P ≤ 1. In addition, when the waterdroplet impacts the micropatterned surface with 2 ≤ D0/P ≤ 4, the spreading coefficient on the micropattern surface is less than1.0 and the dimensionless spreading period gradually lengthens with the increase of D0/P value attributed to the large pressuregradient near the three-phase line.
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