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Your search keyword '"Zhang, Zhenyi"' showing total 19 results
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19 results on '"Zhang, Zhenyi"'

1. Uncertainty Quantification of Phase Transition Problems with an Injection Boundary

Author

Zhang, Zhenyi, Ma, Shengbo, and Zhou, Zhennan

Subjects
Mathematics - Numerical Analysis
Abstract

We develop an enthalpy-based modeling and computational framework to quantify uncertainty in Stefan problems with an injection boundary. Inspired by airfoil icing studies, we consider a system featuring an injection boundary inducing domain changes and a free boundary separating phases, resulting in two types of moving boundaries. Our proposed enthalpy-based formulation seamlessly integrates thermal diffusion across the domain with energy fluxes at the boundaries, addressing a modified injection condition for boundary movement. Uncertainty then stems from random variations in the injection boundary. The primary focus of our Uncertainty Quantification (UQ) centers on investigating the effects of uncertainty on free boundary propagation. Through mapping to a reference domain, we derive an enthalpy-based numerical scheme tailored to the transformed coordinate system, facilitating a simple and efficient simulation. Numerical and UQ studies in one and two dimensions validate the proposed model and the extended enthalpy method. They offer intriguing insights into ice accretion and other multiphysics processes involving phase transitions.

Published
2024

4. Experimental and Numerical Simulation Study of Dynamic Mechanical Behavior of AlMgB14 Ceramic

Author

Zhang, Zhenyi, Xia, Fangchao, Cao, Zhongchen, Yuan, Fei, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Ivanov, Vitalii, Series Editor, Haddar, Mohamed, Series Editor, Cavas-Martínez, Francisco, Editorial Board Member, di Mare, Francesca, Editorial Board Member, Kwon, Young W., Editorial Board Member, Trojanowska, Justyna, Editorial Board Member, Xu, Jinyang, Editorial Board Member, Rui, Xiaoting, editor, and Liu, Caishan, editor

Published
2024
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8. Effects of electron-beam irradiation on the control of bacterium and insect pests in warehoused tobacco and on tobacco quality

Author

WANG Kun, ZHANG Qi, XU Fengzhuo, LI Haozhe, CHEN Xihao, CHEN Zhiyan, ZHOU Zijian, ZHANG Zhenyi, and HUANG Jiang

Subjects
tobacco storage, irradiation sterilization, irradiation insecticide, lasioderma serricorne, tobacco quality, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798, Medical physics. Medical radiology. Nuclear medicine, R895-920
Abstract

The effects of 200 keV and 10 MeV electron-irradiation accelerators on the eradication of lasioderma serricorne and bacteria in tobacco and on the quality of tobacco leaf are investigated. By controlling the parameters of electron-beam irradiation, all lasioderma serricorne and bacteria inside tobacco can be eradicated efficiently and rapidly. The irradiated tobacco exhibits good retention based on a validation experiment, and no colonies are detected within 38 d. The irradiation has no significant effects on the basic physical and chemical indexes or the organic-acid and mineral-element contents of tobacco. Excessive energy levels reduce the volatilization loss of neophytadiene in tobacco from 589.91 to 418.64 μg/g, which indicates that the aroma quality of the tobacco deteriorates to a certain extent. Fluka simulation results show that a 3 MeV electron beam is sufficient to penetrate a full box of stored tobacco at existing tobacco stacking densities.

Published
2024
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19. Multicomponent, Multicavity Metallacages That Contain Different Binding Sites for Allosteric Recognition

Author

Liu, Haifei, Guo, Chenxing, Li, Luqi, Zhang, Zeyuan, Hou, Yali, Mu, Chaoqun, Hou, Gao-lei, Zhang, Zhenyi, Wang, Heng, Li, Xiaopeng, and Zhang, Mingming

Abstract

The encapsulation of different guest molecules by their different recognition domains of proteins leads to selective binding, catalysis, and transportation. Synthetic hosts capable of selectively binding different guests in their different cavities to mimic the function of proteins are highly desirable but challenging. Here, we report three ladder-shaped, triple-cavity metallacages prepared by multicomponent coordination-driven self-assembly. Interestingly, the porphyrin-based metallacage is capable of heteroleptic encapsulation of fullerenes (C60or C70) and coronene using its different cavities, allowing distinct allosteric recognition of coronene upon the addition of C60or C70. Owing to the different binding affinities of the cavities, the metallacage hosts one C60molecule in the central cavity and two coronene units in the side cavities, while encapsulating two C70molecules in the side cavities and one coronene molecule in the central cavity. The rational design of multicavity assemblies that enable heteroleptic encapsulation and allosteric recognition will guide the further design of advanced supramolecular constructs with tunable recognition properties.

Published
2024
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