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| 1 | Mandrel degradation model of combined fast and slow processes显示文摘In this paper, we report the study of degradation for a kind of ideal mandrel material called poly-α-methylstyrene based on theoretical and experimental methods. First-principles calculations reveal two types of process: depolymerization and hydrogen-transfer-induced chain scission. The energy barrier for the former(0.68–0.82 eV) is smaller than that for most of the latter(1.39–4.23 eV). More importantly, reaction rates suggest that the former is fast whereas the latter is mostly slow, which can result in a difference of 5–31 orders of magnitude at 550 K. Furthermore, a thermogravimetric experiment shows that the activation energy of 2.53 eV for degradation is between those of fast and slow processes,corresponding to the theoretical average value of multiple reaction paths. Thus, a mandrel degradation model combining fast and slow processes is established at the atomic level. Our work provides a direction for research into the key technology of target fabrication in inertial confinement fusion. | Yu Zhu Zheng Liu Famin Yu Qiang Chen Wei Feng Zhanwen Zhang Zhigang Wang | 2021 | High Power Laser Science and Engineering2021，9，1： | 0 |
| 2 | ON THE ORIGIN OF TURBULENT SECONDARY FLOW IN A STRAIGHT DUCT OF NON-CIRCULAR CROSS-SECTION显示文摘The origin of turbulent secondary flow in a straight duct of non-circular cross-section is discussed from a theoretical standpoint and examined from a numerical simulation ofthe turbulent flow in a square duct,It is reached that the driving force of such secondary flowcomes from the second-order terms of the difference in gradients of normal and transverseReynolds stresses in the axial vorticity equation.The present results obtained compare well withavailable experimental results for both primary and secondary flow quantities. | Zhao, Lie Wang, Famin Bian, Yungui Yu, Xin | 1993 | Journal of Hydrodynamics1993，5，3： | 0 |
| 3 | Direct assembly between closed-shell coinage metal superatoms显示文摘Bottom-up constructing all-metal functional materials is challenging,because the metal clusters are prone to lose their original structures during coalensence.In this work,we report that closed-shell coinage metal superatoms can achieve direct chemical bonding without losing their electronic properties.The reason is that the supermolecule formed by two superatoms has the same number of bonding and anti-bonding supermolecular orbitals,in which the bonding orbitals contribute to bonding and the antibonding orbitals with anti-phase orbitals delocalized over each monomer to maintain the individual geometric and electronic structural properties.Further analysis indicates the interactions between two superatoms are too weak to break the structure of monomers,which is confirmed by the first-principles molecular dynamics simulations.With these superatoms as the basic units,a series of robust one-dimensional and two-dimensional nanostructures are fabricated.Our findings provide a general strategy to take advantage of superatoms in regulating bonding compared to natural atoms,which paves the way for the bottom-up design of materials with collective properties. | Famin Yu Yu Zhu Yang Gao Rui Wang Wanrong Huang Yi Gao Zhigang Wang | 2022 | Nano Research2022，15，9： | 0 |
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