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Ultrafast epitaxial growth of metre-sized single-crystal graphene on industrial Cu foil
Xu, Xiaozhi,Zhang, Zhihong,Dong, Jichen,Yi, Ding,Niu, Jingjing,Wu, Muhong,Lin, Li,Yin, Rongkang,Li, Mingqiang,Zhou, Jingyuan,Wang, Shaoxin,Sun, Junliang,Duan, Xiaojie,Gao, Peng,Jiang, Ying,Wu, Xiaoson Elsevier 2017 Science bulletin Vol.62 No.15
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Mi, Longqing,Xu, Jian,Feng, Yongyi,Cao, Lei,Xue, Mingqiang,Huang, Yanlin,Chen, Cuili,Seo, Hyo Jin Elsevier 2018 Materials chemistry and physics Vol.204 No.-
<P><B>Abstract</B></P> <P>Yb<SUP>3+</SUP> (0.5–30 mol %) activated Y<SUB>4</SUB>CdMo<SUB>3</SUB>O<SUB>16</SUB> phosphors have been prepared by the traditional solid-state reaction method. The phase formation was investigated by the XRD structural refinements. The surface properties of the powder phosphors were verified by SEM, TEM and EDS measurements. The optical properties were evaluated by the reflectance spectra, photoluminescence excitation and emission spectra, decay curves (lifetimes), and the absolute quantum efficiency (QE). Under the excitation of UV light, Yb<SUP>3+</SUP>-activated Y<SUB>4</SUB>CdMo<SUB>3</SUB>O<SUB>16</SUB> shows the efficient near-infrared (NIR) emission bands (900–1100 nm), which is ascribed to the <SUP>2</SUP>F<SUB>5/2</SUB> → <SUP>2</SUP>F<SUB>7/2</SUB> transitions of Yb<SUP>3+</SUP> ions. The NIR emission intensity shows a dependence on Yb<SUP>3+</SUP> contents, which has an optimal doping of 25 mol %. The energy transfer (ET) from MoO<SUB>4</SUB> to Yb<SUP>3+</SUP> ions in the lattices was discussed. The NIR emission around 1000 nm just corresponds to the optical response of Si-based solar cells. Consequently, the efficiency could be enhanced by arranging luminescent layers mixed with Y<SUB>4</SUB>CdMo<SUB>3</SUB>O<SUB>16</SUB>:Yb<SUP>3+</SUP> phosphors and transparent matrix in the front surface of Si solar cells.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The structural refinements of the Yb<SUP>3+</SUP>-doped phosphors were completed. </LI> <LI> The charge transfer of the molybdate to Yb<SUP>3+</SUP> ions is efficient. </LI> <LI> Efficient conversion from near UV light to Yb<SUP>3+</SUP> IR emission was demonstrated. </LI> <LI> This is an excellent candidate for enhancement of spectral response of Si-based solar cells. </LI> </UL> </P>
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Shuqing Wang,Yufeng Jiang,Mingqiang Xu,Yingchao Li,Zhixiong Li 국제구조공학회 2020 Steel and Composite Structures, An International J Vol.36 No.1
The purpose of this study is to develop an effective iterative two-stage method (ITSM) for structural damage identification of offshore platform structures. In each iteration, a new damage index, Modal Energy-Based Damage Index (MEBI), is proposed to help effectively locate the potential damage elements in the first stage. Then, in the second stage, the beetle antenna search (BAS) algorithm is used to estimate the damage severity of these elements. Compared with the well-known particle swarm optimization (PSO) algorithm and genetic algorithm (GA), this algorithm has lower computational cost. A modal energy based objective function for the optimization process is proposed. Using numerical and experimental data, the efficiency and accuracy of the ITSM are studied. The effects of measurement noise and spatial incompleteness of mode shape are both considered. All the obtained results show that under these influences, the ITSM can accurately identify the true location and severity of damage. The results also show that the objective function based on modal energy is most suitable for the ITSM compared with that based on flexibility and weighted natural frequency-mode shape.
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A novel multistage approach for structural model updating based on sensitivity ranking
Yufeng Jiang,Yingchao Li,Shuqing Wang,Mingqiang Xu 국제구조공학회 2020 Smart Structures and Systems, An International Jou Vol.25 No.6
A novel multistage approach is developed for structural model updating based on sensitivity ranking of the selected updating parameters. Modal energy-based sensitivities are formulated, and maximum-normalized indices are designed for sensitivity ranking. Based on the ranking strategy, a multistage approach is proposed, where these parameters to be corrected with similar sensitivity levels are updated simultaneously at the same stage, and the complete procedure continues sequentially at several stages, from large to small, according to the predefined levels of the updating parameters. At every single stage, a previously developed cross model cross mode (CMCM) method is used for structural model updating. The effectiveness and robustness of the multistage approach are investigated by implementing it on an offshore structure, and the performances are compared with nonmultistage approach using numerical and experimental vibration information. These results demonstrate that the multistage approach is more effective for structural model updating of offshore platform structures even with limited information and measured noise. These findings serve as a preliminary strategy for structural model updating of an offshore platform in service.
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Xuehan Wang,Mingxuan Li,Liwei Liu,Rui Mou,Xiuming Zhang,Yanling Bai,Haijin Xu,Mingqiang Qiao 한국미생물학회 2012 The journal of microbiology Vol.50 No.6
A Pseudomonas aeruginosa mutant strain M122 was isolated from a Mu transposon insertion mutant library. In our prophase research, we have found that PA0058, a novel gene encodes a 234-residue conserved protein, was disrupted in the M122 mutant. In this study, the bacteriostatic experiment in vitro indicates that M122 has abnormally high aminoglycoside resistance. We expressed PA0058 in E. coli and found that PA0058 oxidizes and reduces disulfide. This biochemical characterization suggests that PA0058 is a novel disulfide oxidoreductase. Hence, the protein was designated as DsbM. Microarray analysis of the M122 mutant showed its unusual phenotype might be related to the bacterial antioxidant defense system mediated by the oxyR regulon. Meanwhile, we detected –SH content in the periplasm of M122 and wild strain and found a lower –SH/S–S ratio in M122. Therefore, we consider that the loss of dsbM function decreased the –SH/S–S ratio, which then prolongs the OxyR-regulated response, thereby conferring high aminoglycoside resistance to the M122 mutant strain. Our findings have important implications for understanding the mechanisms underlying aminoglycoside resistance in P. aeruginosa.
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