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- 저자 : Ergang, N. S. (검색결과 3 건)
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Liang Bai,Cai Zhang,Ergang Xiong 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.7
This paper describes the study of steel tube reinforced concrete (STRC) shear walls with a low shear-span ratio, in which steel tubes are embedded in the web of the shear wall. The addition of these steel tubes can significantly improve the shear behavior of ordinary RC shear walls. A series of cyclic loading tests allow us to examine the failure mode, hysteretic behavior, deformability, and energy dissipation capacity of the STRC shear walls. The investigation indicate the STRC shear walls transform from entire section walls to walls with vertical slits under loading. This prevents brittle shear failure and improves the deformation and energy dissipation capacity of the specimens. A softened strut-and-slip model is applied to analyze the shear mechanism of STRC shear walls, and is shown to predict the shear capacity accurately.
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Lee, K. T.,Lytle, J. C.,Ergang, N. S.,Oh, S. M.,Stein, A. WILEY-VCH Verlag 2005 Advanced functional materials Vol.15 No.4
<P>Three-dimensionally ordered macroporous (3DOM) materials are composed of well-interconnected pore and wall structures with wall thicknesses of a few tens of nanometers. These characteristics can be applied to enhance the rate performance of lithium-ion secondary batteries. 3DOM monoliths of hard carbon have been synthesized via a resorcinol-formaldehyde sol–gel process using poly(methyl methacrylate) colloidal-crystal templates, and the rate performance of 3DOM carbon electrodes for lithium-ion secondary batteries has been evaluated. The advantages of monolithic 3DOM carbon electrodes are: 1) solid-state diffusion lengths for lithium ions of the order of a few tens of nanometers, 2) a large number of active sites for charge-transfer reactions because of the material's high surface area, 3) reasonable electrical conductivity of 3DOM carbon due to a well-interconnected wall structure, 4) high ionic conductivity of the electrolyte within the 3DOM carbon matrix, and 5) no need for a binder and/or a conducting agent. These factors lead to significantly improved rate performance compared to a similar but non-templated carbon electrode and compared to an electrode prepared from spherical carbon with binder. To increase the energy density of 3DOM carbon, tin oxide nanoparticles have been coated on the surface of 3DOM carbon by thermal decomposition of tin sulfate, because the specific capacity of tin oxide is larger than that of carbon. The initial specific capacity of SnO<SUB>2</SUB>-coated 3DOM carbon increases compared to that of 3DOM carbon, resulting in a higher energy density of the modified 3DOM carbon. However, the specific capacity decreases as cycling proceeds, apparently because lithium–tin alloy nanoparticles were detached from the carbon support by volume changes during charge–discharge processes. The rate performance of SnO<SUB>2</SUB>-coated 3DOM carbon is improved compared to 3DOM carbon.</P> <B>Graphic Abstract</B> <P>Inverse-opal carbon monoliths have been fabricated (see Figure) from colloidal-crystal templates infiltrated with resorcinol-formaldehyde precursor solutions. These nanoarchitectured carbon monoliths demonstrate relatively high electrochemical rate performance compared to similarly prepared, but non-templated, carbon electrodes. <img src='wiley_img/1616301X-2005-15-4-ADFM200400186-content.gif' alt='wiley_img/1616301X-2005-15-4-ADFM200400186-content'> </P>
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Li, Yuxiang,Kim, Minseok,Wu, Ziang,Lee, Changyeon,Lee, Young Woong,Lee, Jin-Woo,Lee, Young Jun,Wang, Ergang,Kim, Bumjoon J.,Woo, Han Young The Royal Society of Chemistry 2019 Journal of Materials Chemistry C Vol.7 No.6
<P>In order to understand the influence of molecular ordering and orientation on the performance of nonfullerene (NF) solar cells, we synthesized a series of difluoroquinoxaline-based alternating copolymers: starting from poly(2,2′-bithiophene-<I>alt</I>-(2,3-bis(3,4-bis(octyloxy)phenyl)-6,7-difluoroquinoxaline)) (PDFQx-2T), we modified the polymeric backbone by incorporating fluorine atoms (PDFQx-2T2F) or thiophene (PDFQx-3T) or a benzene ring (PDFQx-2TB) in the bithiophene comonomeric unit. The structure modification significantly affected the photovoltaic performance with power conversion efficiencies (PCEs) of 3.95% for PDFQx-2TB:ITIC, 4.82% for PDFQx-2T:ITIC, 4.93% for PDFQx-2T2F:ITIC and 8.13% for PDFQx-3T:ITIC. The dramatic increase in the PCE of PDFQx-3T:ITIC was attributed to improvements in the short-circuit current density (<I>J</I>SC) and fill factor (FF). From the resonant soft X-ray scattering and grazing incidence X-ray scattering measurements, the PDFQx-3T polymers had well-developed, face-on oriented crystallites, allowing the formation of face-to-face alignment with the face-on ordered ITIC molecules at the interfaces. Also, the PDFQx-3T:ITIC blend films exhibited well intermixed blend morphology with smaller domain spacings. These combined features contributed to efficient charge generation with the highest exciton dissociation probability among the four different polymer:ITIC systems. In addition, dominant face-on orientation of both PDFQx-3T polymers and ITIC acceptors with a balanced crystalline coherence length ratio (CCLpolymer/CCLITIC) (0.87, based on the out-of-plane (010) diffraction peaks of PDFQx polymers and ITIC acceptors) led to a more balanced charge mobility than other blends, explaining the highest <I>J</I>SC and FF in the PDFQx-3T:ITIC NF devices.</P>
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