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- 저자 : Tian Yuxin (검색결과 6 건)
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Yuxin Zhang,Xiang Tian,Juwei Xia,Hexin Zhang Techno-Press 2023 Structural monitoring and maintenance Vol.10 No.3
Magnetic flux sensors are commonly used in monitoring the cable force, but the application of the sensors in large diameter non-closed Galfan cables, as those adopted in Yueqing Gymnasium which is located in Yueqing City, Zhejiang Province, China and is the largest span hybrid space structure in the world, is seldom done in engineering. Based on the construction of Yueqing Gymnasium, this paper studies the cable tension monitoring using the magnetic flux method across two stages, namely, the pre-calibration stage before the cable leaves the rigging factory and the field tension formation stage of the cable system. In the pre-calibration stage in the cable factory, a series of 1:1 full-scale comparative tests were carried out to study the feasibility and relability of this kind of monitoring method, and the influence on the monitoring results of charging and discharging voltage, sensor location, cable diameter and fitting method were also studied. Some meaningful conclusions were obtained. On this basis, the real-time cable tension monitoring system of the structure based on the magnetic flux method is established. During the construction process, the monitoring results of the cables are in good agreement with the data of the on-site pressure gauge.The work of this paper will provide a useful reference for cable force monitoring in the construction process of long-span spatial structures.
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Structure and electrical properties of Pr6O11-doped CaCu3Ti4O12 NTC ceramics
Zuo Yang,Tian Jian,Tian Yuxin,Miao Guangtan,Fu Peng 한국세라믹학회 2023 한국세라믹학회지 Vol.60 No.3
The xPr6O11–(1 − x)CaCu3Ti4O12 (CCTO) ceramics with perovskite structure were prepared by the solid-state reaction method. The effects of Pr 6O11 addition on the microstructure and electrical properties of the CCTO ceramics were studied. The addition of Pr 6O11 promoted the sintering of CCTO ceramics, and the mean grain sizes increased gradually from 2.13 to 5.08 μm with increasing Pr 6O11 content. All the samples had noticeable negative temperature coefficient (NTC) effect, and both the grain and grain boundary effects contributed to their NTC characteristics. The thermistor characteristic parameter B25/75 decreased from 6883 to 5291 K as Pr 6O11 contents increased from 0.00 to 0.08. The analysis shows that the conductivity of Pr 6O11–CCTO ceramics arises mainly from the electron hopping transport mechanism. The GB resistances are noticeably higher than grain resistances at the same Pr 6O11 content. All the samples showed electrical relaxation behavior. The above observations indicate that the structures and electrical properties of CCTO ceramics can be attuned precisely by adjusting the Pr 6O11 concentration.
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Zhang Zhaoqiang,Yuxin Yi,Tian Liao,Xiaowei Li 한국강구조학회 2023 International Journal of Steel Structures Vol.23 No.4
To investigate the seismic performance of RC circular column strengthened with self-compacting concrete (SCC) -filled steel tubes (SCFST), nine specimens of height 1200 mm, varying with a cross-section shape of steel tube (external diameter: 218 mm, cross-section dimensions: 200 mm × 200 mm) were tested under axial load and cyclic lateral load. Three parameters, including the axial compression ratio, the cross-section shape of steel tube, and the embedding rebars ratio, were considered in the tests. The failure mode, hysteresis curves, skeleton curves, ductility, stiffness degradation, and energy-dissipation capacity were analysed. Experimental results showed that the bearing capacity and stiffness of the strengthened column were 5.4 and 9.08 times than that of the unstrengthened column respectively, and the improvement ratio of ductility and energy dissipation reached 123% and 85.7% respectively. The bearing capacity and stiffness of the square SCFST strengthened column was enhanced by 28.57% and 42.11% respectively, compared with the circular SCFST strengthened column. With the designed axial compression ratio increasing, the bearing capacity, initial stiffness, and energy dissipation capacity of strengthened columns increased by 17–39%, 21–60%, and 15–40% respectively, but the ductility coefficient decreased by 8.56–32.4%. The bearing capacity and energy dissipation of the specimen with an embedding rebars ratio of 0.06% increased by 7.5% and 9.31% respectively, but the ductility decreased by 12.81%. When the embedding rebars ratio was 0.1%, the reinforcement effect can be basically negligible.
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Zhu, Shijin,Li, Li,Liu, Jiabin,Wang, Hongtao,Wang, Tian,Zhang, Yuxin,Zhang, Lili,Ruoff, Rodney S.,Dong, Fan American Chemical Society 2018 ACS NANO Vol.12 No.2
<P>Two-dimensional birnessite has attracted attention for electrochemical energy storage because of the presence of redox active Mn<SUP>4+</SUP>/Mn<SUP>3+</SUP> ions and spacious interlayer channels available for ions diffusion. However, current strategies are largely limited to enhancing the electrical conductivity of birnessite. One key limitation affecting the electrochemical properties of birnessite is the poor utilization of the MnO<SUB>6</SUB> unit. Here, we assemble β-MnO<SUB>2</SUB>/birnessite core–shell structure that exploits the exposed crystal face of β-MnO<SUB>2</SUB> as the core and ultrathin birnessite sheets that have the structure advantage to enhance the utilization efficiency of the Mn from the bulk. Our birnessite that has sheets parallel to each other is found to have unusual crystal structure with interlayer spacing, Mn(III)/Mn(IV) ratio and the content of the balancing cations differing from that of the common birnessite. The substrate directed growth mechanism is carefully investigated. The as-prepared core–shell nanostructures enhance the exposed surface area of birnessite and achieve high electrochemical performances (for example, 657 F g<SUP>–1</SUP> in 1 M Na<SUB>2</SUB>SO<SUB>4</SUB> electrolyte based on the weight of parallel birnessite) and excellent rate capability over a potential window of up to 1.2 V. This strategy opens avenues for fundamental studies of birnessite and its properties and suggests the possibility of its use in energy storage and other applications. The potential window of an asymmetric supercapacitor that was assembled with this material can be enlarged to 2.2 V (in aqueous electrolyte) with a good cycling ability.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2018/ancac3.2018.12.issue-2/acsnano.7b03431/production/images/medium/nn-2017-03431b_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn7b03431'>ACS Electronic Supporting Info</A></P>
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