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- 저자 : Zijun Liu (검색결과 3 건)
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Vibration reduction design of the Hangzhou Bay cable-stayed bridges
Liu, Weiqing,Xu, Xiuli,Wang, Rengui,Wang, Zijun,Wu, Xiaolan Techno-Press 2006 Structural Engineering and Mechanics, An Int'l Jou Vol.24 No.3
Hangzhou Bay Bridge spans the Hangzhou Bay and is located at Zhejiang province in the southeast seacoast of China. The total length of the bridge is 36 km. The bridge is composed of bridge approaches made up of multi-span prestressed concrete box girders and two cable-stayed bridges over the north and south navigable spans respectively. The seismic response analysis of the bridge model shows that if the navigable spans are designed as the routine earthquake-resistance system, the displacements and internal forces in pylons, piers and deckes are too large to satisfy the anti-seismic requirement of the structure. Therefore, the seismic reduction design was carried out by using viscous dampers to dissipate the kinetic energy of the structure both longitudinally and transversely. Using the vibration reduction system and aiming at the reasonable optimal goal, the purpose to reduce the seismic responses in south and north navigable spans has been achieved.
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Yanmin Shen,He Wang,Zijun Liu,Weikun Li,Yuhua Liu,Jingjing Li,Hong-Liang Wei,Huayun Han 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.93 No.-
A new type of water-retaining, slow-release fertilizer (WSF) based on double-network hydrogels wasfabricated via the ion-crosslinking of sodium carboxymethyl cellulose and the free radical polymeriza-tion of polymerizable β-cyclodextrin (MAH-CD), polyethylene glycol dimethacrylate (PEGDA), acrylamide(AM), and acrylic acid (AA) with urea-loaded halloysite as an additive. The effects of the AM to AAmonomer ratio, the halloysite content, the AlCl3 content and the MAH-CD content on the swelling ratiowere studied. Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), andthermogravimetric analysis (TGA) were applied to characterize the structure and properties of the WSF. The swelling behavior and water retention capacity of the fertilizer were investigated using a classicgravimetric method. The experimental results indicated that the presence of halloysite nanotubes clearlyadjusted the swelling and release properties of the WSF. Kinetic modeling indicated that the swellingmechanism and slow release behavior were consistent with a Fickian diffusion mechanism. Form theconsiderations of its properties and raw materials, the fertilizer developed here has a good prospect ofapplication and extension.
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Xu, Sheng,Yan, Zheng,Jang, Kyung-In,Huang, Wen,Fu, Haoran,Kim, Jeonghyun,Wei, Zijun,Flavin, Matthew,McCracken, Joselle,Wang, Renhan,Badea, Adina,Liu, Yuhao,Xiao, Dongqing,Zhou, Guoyan,Lee, Jungwoo,Chu American Association for the Advancement of Scienc 2015 Science Vol.347 No.6218
<P><B>Popping materials and devices from 2D into 3D</B></P><P>Curved, thin, flexible complex three-dimensional (3D) structures can be very hard to manufacture at small length scales. Xu <I>et al.</I> develop an ingenious design strategy for the microfabrication of complex geometric 3D mesostructures that derive from the out-of-plane buckling of an originally planar structural layout (see the Perspective by Ye and Tsukruk). Finite element analysis of the mechanics makes it possible to design the two 2D patterns, which is then attached to a previously strained substrate at a number of points. Relaxing of the substrate causes the patterned material to bend and buckle, leading to its 3D shape.</P><P><I>Science</I>, this issue p. 154; see also p. 130</P><P>Complex three-dimensional (3D) structures in biology (e.g., cytoskeletal webs, neural circuits, and vasculature networks) form naturally to provide essential functions in even the most basic forms of life. Compelling opportunities exist for analogous 3D architectures in human-made devices, but design options are constrained by existing capabilities in materials growth and assembly. We report routes to previously inaccessible classes of 3D constructs in advanced materials, including device-grade silicon. The schemes involve geometric transformation of 2D micro/nanostructures into extended 3D layouts by compressive buckling. Demonstrations include experimental and theoretical studies of more than 40 representative geometries, from single and multiple helices, toroids, and conical spirals to structures that resemble spherical baskets, cuboid cages, starbursts, flowers, scaffolds, fences, and frameworks, each with single- and/or multiple-level configurations.</P>
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