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Life-Cycle System Reliability-Based Approach for Bridge Pile Foundations under Scour Conditions
Zhongyang Wu,Zhe Luo 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.2
Due to the soil spatial variability, it is still challenging to quantify the long-term reliability of bridge pile foundations under scour conditions. In this paper, a life-cycle system reliability-based approach that can explicitly address the scour-hole geometry and stress history is presented. The finite difference models implemented with the modified load transfer curves are developed to predict the pile performance. Two serviceability failure modes, settlement failure and lateral deflection failure, are investigated in the reliability analysis. This developed approach provides a new tool for the long-term performance assessment and rehabilitation of bridge pile foundations.
Pyrolysis of wood species based on the compositional analysis
Qian Liu,Kaige Wang,Zhongyang Luo,Kefa Cen,Shurong Wang 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.2
Based on the Van Soest method, the components in Chinese fir and fast-growing poplar were quantified, and the fiber present was separated into three fractions: neutral detergent fiber, acid detergent fiber and strong acid detergent fiber. Microstructure of the fibers was investigated by a Fourier transform infrared spectrometry. Cellulose and hemicellulose both represent the characteristics of polysaccharides, while lignin has dissimilar structure. Pyrolysis of fir, poplar and the detergent fibers was carried out on a thermogravimetric analyzer coupled with FTIR spectrometry. After the removal of extractives and soluble minerals, pyrolysis of NDF shows the haracteristics of the three main components. Hydrocarbons, aldehydes, ketones, acids, alcohols and others are generated due to the primary pyrolysis of hemicellulose and cellulose in single stages. Phenols and alcohols are the dominant volatiles released from pyrolysis of lignin in two successive stages, respectively.
Experimental study on ZnO-TiO2 sorbents for the removal of elemental mercury
Kunzan Qiu,Jinsong Zhou,Pan Qi,Qixin Zhou,Xiang Gao,Zhongyang Luo 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.9
ZnO-TiO2 sorbents synthesized by an impregnation method were characterized through XRD (X-ray diffraction), XPS (X-ray photoelectron spectroscopy) and EDS (Energy dispersive spectrometer) analyses. An experiment concerning the adsorption of Hg0 by ZnO-TiO2 under a simulated fuel gas atmosphere was then conducted in a benchscale fixed-bed reactor. The effects of ZnO loading amounts and reaction temperatures on Hg0 removal performance were analyzed. The results showed that ZnO-TiO2 sorbents exhibited excellent Hg0 removal capacity in the presence of H2S at 150 oC and 200 oC; 95.2% and 91.2% of Hg0 was removed, respectively, under the experimental conditions. There are two possible causes for the H2S reacting on the surface of ZnO-TiO2: (1) H2S directly reacted with ZnO to form ZnS, (2) H2S was oxidized to elemental sulfur (Sad) by means of active oxygen on the sorbent surface, and then Sad provided active absorption sites for Hg0 to form HgS. This study identifies three reasons why higher temperatures limit mercury removal. First, the reaction between Hg0 and H2S is inhibited at high temperatures. Second, HgS, as the resulting product in the reaction of mercury removal, becomes unstable at high temperatures. Third, the desulfurization reaction strengthens at higher temperatures, and it is likely that H2S directly reacts with ZnO, thus decreasing the Sad on the sorbent surfaces.
Experimental study of acetone removal by packed-bed dielectric barrier discharge reactor
Chenghang Zheng,Xinbo Zhu,Xiang Gao,Lu Liu,Qianyun Chang,Zhongyang Luo,Kefa Cen 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
In this study, a packed-bed dielectric barrier discharge (DBD) reactor was developed for acetone removal. The effects of packing materials were investigated in terms of discharge characteristics, removal efficiency and byproducts formation. The identification of organic byproducts was conducted. The results indicated the presence of packing materials enhanced the energy density and exhibited a positive effect on acetone removal, while high oxygen concentration inhibited the removal of acetone. The formations of byproducts were significantly reduced in the presence of packing materials. The degradation pathways and mechanisms were discussed, showing CH3 radicals played a crucial role in the acetone degradation process. Published by Elsevier B.V.