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Jie Tan,Mahadi Masud,Xiaoming Qin,Cheng Yuan,Qingzhao Kong,Y.L.Mo 국제구조공학회 2021 Smart Structures and Systems, An International Jou Vol.28 No.5
Pier column, as the most critical load-bearing member of bridge, can bear multiple loads including axial forces,shear forces, bending moments, etc. The varied cross section at the column interface and bearing platform or drilled shaft leads to harmful stress concentration that can potentially compromise the structural integrity. In order to improve the ductility of bridge structure, a pier column is often designed with a variable cross-section region to dissipate energy through plastic deformation. For better understanding the health condition of pier column in its service life, it is of great significance to obtain the damage severity information in the variable cross-section region. This study utilizes an active sensing method enabled by distributed Lead Zirconate Titanate (PZT)-based Smart Aggregate (SA) sensors to monitor the damage initiation and development near the bottom of a pier column. Crack damage in variable cross-section region functions as a stress relief that attenuates propagating stress wave energy between SA pairs. Both the numerical and experimental results show that the reduction ratio of the stress wave energy is consistent with the crack development, thus validating the reliability of the investigated approach. SA-based technology can be used as a potential tool to provide early warning of damage in variable cross-section region of bridge structures.
EFFICIENT TiO2 NANOPARTICLES/NANORODS COMPOSITE ELECTRODES FOR DYE-SENSITIZED SOLAR CELLS
XIANWEI HUANG,PING SHEN,XIAOMING FENG,ZHUO TAN,SONGTING TAN,BIN ZHAO 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2012 NANO Vol.7 No.2
A new TiO2 nanoparticles/nanorods composite electrode was fabricated and applied in dye-sensitized solar cells (DSSCs). The TiO2 nanorods were obtained by grinding the electrospun TiO2 nanofibers mechanically. The composite photoanode of dye-sensitized solar cells was fabricated by using TiO2 nanoparticles (P25) and electrospun TiO2 nanorods. At the optimized condition, the power conversion efficiency (η) based on a triphenylamine dye (SD2) and a ruthenium dye (N719) are 8.28% and 8.80% under AM 1.5 illumination (100 mW ⋅ cm-2), respectively. The results show that the electrospun TiO2 nanorods in the composite photoanode improve the physicochemical properties and enhance the photovoltaic performances of solar cells.
Synthesis of Carbon Dots from PEG6000 and Papain for Fluorescent and Doxycycline Sensing
Yuanjiao Feng,Lihong Tan,Qian Tang,Wenwu Zhong,Xiaoming Yang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.09
Herein, a simple-green road for preparing carbon dots (CDs) from the mixture of PEG6000 and papain with approving fluorescence has been successfully developed for the first time. Meanwhile, the current CDs were characterized by analytical means such as fluorescence, UV visible spectrophotometer, HR-TEM, XPS and FTIR and so on. Afterwards, this kind of CDs were employed for analyzing doxycycline (DC) relying on the mechanism that the functional group of DC had interactions with CDs, hence, leading to the fluorescence quenching. Also, this DC analytical method mentioned here permitted in a linear range of 5.0 x 10 -8 mol/L - 5.0 x 10 -4 mol/L as well as a detection limit of 18nM at a signal-to-noise ratio (S/N) of 3. More importantly, the CDs prepared here were still explored for milk real samples, indicating their potential for broadening avenues towards other various applications.
Strategies of Knowledge Pricing and the Impact on Firms’ New Product Development Performance
( Chuanrong Wu ),( Ning Tan ),( Zhi Lu ),( Xiaoming Yang ),( Mark E. Mcmurtrey ) 한국인터넷정보학회 2021 KSII Transactions on Internet and Information Syst Vol.15 No.8
The economics of big data knowledge, especially cloud computing and statistical data of consumer preferences, has attracted increasing academic and industry practitioners' attention. Firms nowadays require purchasing not only external private patent knowledge from other firms, but also proprietary big data knowledge to support their new product development. Extant research investigates pricing strategies of external private patent knowledge and proprietary big data knowledge separately. Yet, a comprehensive investigation of pricing strategies of these two types of knowledge is in pressing need. This research constructs an overarching pricing model of external private patent knowledge and proprietary big data knowledge through the lens of firm profitability as a knowledge transaction recipient. The proposed model can help those firms who purchase external knowledge choose the optimal knowledge structure and pricing strategies of two types of knowledge, and provide theoretical and methodological guidance for knowledge transaction recipient firms to negotiate with knowledge providers.
3D Unsteady Simulation of the Transport Characteristics in the LEC Melt of In-Doped GaAs
Shuxian Chen,Shilin Li,Xiaoming Tan 보안공학연구지원센터 2016 International Journal of Multimedia and Ubiquitous Vol.11 No.5
A three-dimensional and time-dependent turbulent mathematical model is established for the mass, heat, momentum and dopant transport in the LEC melt of In-doped GaAs. The Solution scheme for the dopant segregation effect at the melt/crystal interface is put forward. Grid testing calculations have been performed for the choice of the grid. The turbulent mathematical model and numerical methodology are used to simulate the melt convections and dopant transports in the previously published experiments, and the numerical accuracy is validated by comparing the results with the experimental data in different model setups. Some transport characteristics in the LEC melt of In-doped GaAs have been concluded. Owing to the interacting forces associated with different length scales in the LEC melt, the fluid flow is non-axisymmetric. Because of the competition between buoyancy, Marangoni force, centrifugal force and the Coriolis force, the temperature fluctuates in the melt. Due to the segregation, the InAs concentration increase in the axial direction.
Sha Ke,Zhaohui Yang,Fei Yang,Xiaoming Wang,Juan Tan,Bo Liao 연세대학교의과대학 2019 Yonsei medical journal Vol.60 No.7
Purpose: Alzheimer’s disease (AD) is the most common neurodegenerative disease, with a rising prevalence worldwide. Longnoncoding RNAs (lncRNAs) have been found to play important roles in the development and treatment of AD. However, the exactrole of lncRNA nuclear enriched abundant transcript 1 (NEAT1) in neuronal damage in AD is largely unknown. Materials and Methods: The AD model was established in SH-SY5Y and SK-N-SH cells via treatment with amyloid β1-42 (Aβ). Theexpression of NEAT1 and microRNA-107 (miR-107) was measured by quantitative real-time polymerase chain reaction. Cell viabilityand apoptosis were detected by MTT assay, immunocytochemistry, and flow cytometry. The expression of phosphorylated tauprotein (p-Tau) was measured by Western blot. The interaction between NEAT1 and miR-107 was explored by bioinformaticsanalysis, luciferase activity, and RNA immunoprecipitation assays. Results: NEAT1 expression was enhanced in Aβ-treated SH-SY5Y and SK-N-SH cells, and its knockdown attenuated Aβ-inducedinhibition of viability and promotion of apoptosis and p-Tau levels. NEAT1 was indicated as a decoy of miR-107. miR-107 abundancewas reduced in Aβ-treated cells, and its overexpression reversed Aβ-induced injury. Moreover, interference of miR-107 abatedsilencing of NEAT1-mediated inhibition of neuronal damage in Aβ-treated SH-SY5Y and SK-N-SH cells. Conclusion: LncRNA NEAT1 aggravated Aβ-induced neuronal damage by sponging miR-107, indicating a novel avenue for treatmentof AD.