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Seismic Fragility Analysis of V-Shaped Continuous Girder Bridges
Leping Ren,Gang Zhang,Yongfei Zhang,Shuanhai He 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.3
This paper presents an improved approach for evaluating seismic performance of V-shaped continuous girder bridges with different V-angles. A 3-D finite element model is established using the OpenSees for tracing the response of a typical three-span V-shaped continuous girder bridge. The analysis is performed in three steps: component fragility analysis, validated system fragility analysis and V-angle analysis. A series of nonlinear time history analysis(NLTHA), considering the uncertainty in bridge structural parameters and ground motions characteristics, is carried out to investigate the potential fragile position of a V-shapedcontinuous girder bridge. Subsequently, a new improved product of conditional marginal(PCM) method is validated successfully and utilized to form the system fragility curves. The application of the validated method is used to analyse the influence of V-angle on the bridge structural system fragility. The analysis result shows that variation of V-angle has significantinfluence on seismic fragility of V-shaped continuous girder bridges. The V-shaped continuous girder bridges with 80° V-angle has good seismic performance when PGA ≤ 0.8 g. Smaller V-angle can result in higher seismic fragility of V-shaped continuous girder bridges.
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Gearbox health condition identification by neuro-fuzzy ensemble
Long Zhang,Guoliang Xiong,Leping Liu,Qingsong Cao 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.3
A neuro-fuzzy ensemble (NFE) model has been investigated for machinery health diagnosis. The proposed diagnosis system was illustrated by discriminating between various gear health conditions of a motorcycle gearbox. Four different health scenarios were considered in this work: normal, slight-worn, medium-worn and broken-teeth gear. Experimental results show the NFE model per-forms better than single neuro-fuzzy (NF) model with respect to classification accuracy, sensitivity and specificity, while the computational complexity is not increased significantly. In addition, the NF-based models are able to interpret their reasoning behavior in an intuitively understandable way as fuzzy if-then rules, which allows users to gain a deep insight into the data.
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Ionic Liquids as Selectors for Controlling the Crystallization Nucleation of Hen Egg White Lysozyme
Zhanzhong Wang,Qian Wang,Leping Dang 한국생물공학회 2012 Biotechnology and Bioprocess Engineering Vol.17 No.5
Ionic liquids (ILs) have biomaterial applications and are used for protein crystallization. The effect of two imidazolium-based ILs, 1-butyl-3-methylimidazolium chloride ([C4mim]Cl) and 1,3-dimethylimidazolium iodide ([dmim]I),on the nucleation kinetics of lysozyme was investigated by determining the nucleation induction time, and nucleation parameters were evaluated. The values of interfacial tension calculated for solutions with added 30 g/L ILs [C4mim]Cl and [dmim]I, and without added ILs were 99.03, 109.7, and 107.3 mJ/m2, respectively. Compared with solutions without IL addition, the critical free energy change, size, and molecular number of critical nuclei decreased and the nucleation rate increased after the addition of [C4mim]Cl. In contrast, the critical free energy change, size, and molecular number of critical nuclei increased and the nucleation rate decreased after the addition of [dmim]I. These new findings provide insights into controlling lysozyme crystallization separation, and present ILs as potentially useful additives for controlling the crystallization of macromolecules.
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Nucleation behavior of glutathione polymorphs in water
Hongyuan Wei,Zhi Chen,Leping Dang,Shuai Li 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.10
Nucleation behavior of glutathione (GSH) polymorphs in water was investigated by experimental method combined with classical nucleation theory. The solubility of α and β forms GSH in water at different temperatures,and the nucleation induction period at various supersaturations and temperatures were determined experimentally. The results show that, in a certain range of supersaturation, the nucleation of β form predominates at relatively higher temperature,while α form will be obtained at lower temperature. The nucleation kinetics parameters of α and β form were then calculated. To understand the crucial role of temperature on crystal forms, “hypothetic” nucleation parameters of β form at 283.15 K were deduced based on extrapolation method. The results show that the interfacial tension, critical free energy, critical nucleus radius and nucleus number of α form are smaller than that of β form in the same condition at 283.15 K, which implies that α form nucleates easier than β form at low temperature. This work may be useful for the control and optimization of GSH crystallization process in industry.
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Mengfei Qu,Yu Bai,Qijun Hu,Leping He,Enxi Qiu,Xusheng Wan 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.11
The measurement of the saturated internal friction angle of landslide sliding zone soils during the geological investigation could assist in engineering design, as it is a crucial parameter for landslide control. This research developed a comprehensive method to predict the saturated internal friction angle based on the support vector machine (SVM), after investigating the relationship between the saturated internal friction angle and the factors that affect the saturated internal friction angle. The procedure mainly consists of exploratory data analysis, influencing factors analysis, and prediction model set-up. Among the 18 factors, the evolution stage, gravel content, plasticity index, and dry unit weight were the most relevant factors predicting the saturated internal friction angle. The proposed method was illustrated and verified by a model accuracy test with the mean absolute error of the radial basis functions (RBF) kernel function was 0.90°, and the mean relative error was 8.77%. Therefore, this method could provide a reliable saturated internal friction angle in assisting engineers during landslide control.
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Alejandra Pérez-Nava,Josué D. Mota-Morales,Zaira Y. García-Carvajal,Sara E. Herrera-Rodríguez,Gerardo Arrevillaga-Boni,Cristy L. Azanza-Ricardo,Milton O. Vazquez-Lepe,J. Betzabe Gonzalez-Campos 한국섬유공학회 2018 Fibers and polymers Vol.19 No.1
Silver and gold nanoparticles were produced and embedded in poly(vinyl alcohol) (PVA) and chitosan (CTS) solutions by the photoreduction of metallic salt precursors triggered by direct sunlight irradiation, in which the polymers acted as reducing, dispersing and stabilizing agents. Sunlight photoreduction can be standardized using a constant UV index regardless of the season. This strategy was found to be an improvement over other common energy sources used to trigger the reduction of metal ions, including UV light irradiation and high-temperature reduction with mechanical stirring. The resulting PVA/metal nanoparticle and CTS/metal nanoparticle composite solutions were processed into thin films and nanofiber composites. In vitro testing of the cytotoxicity and biocompatibility demonstrates that the film composites are non-toxic andbiocompatible with the HT-29 human colon cancer cell line. Promotion of HT-29 cell growth using our hybrid composites was observed, in contrast to other studies in which colloidal NPs were tested. Therefore, a sustainable approach for the onestep preparation of biocompatible polymer/metallic nanoparticle composites is reported.
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