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Experimental Study on Structural Performance of Cast-in-Place Frame Printed Concrete Wall
Yanan Fu,Ying Zhang,Lei Wu 한국콘크리트학회 2024 International Journal of Concrete Structures and M Vol.18 No.1
A growing number of nations and regions have printed concrete structures thanks to the application of 3D printing technology in the field of civil engineering. However, the houses built with printed concrete are mostly printed concrete wall structures with composite load-bearing walls and cast-in-place frames. This structure solely takes into account the performance of the structure under vertical loads, which does not address its ability to withstand horizontal loads. In this paper, wall specimens were designed and tested under horizontal reciprocal loads in order to investigate the structural performance of this cast-in-place border-frame printed concrete wall structure under horizontal loads. Four factors are examined in order to determine how well the cast-in-place frame printed concrete wall structure performs when subjected to horizontal loads: column longitudinal reinforcement strain, hysteresis curve, skeleton curve, and energy dissipation capacity. According to the test results, the addition of the wall increased the bearing capacity and accumulated energy dissipation of the specimen, but the increase in stiffness also caused the structural ductility to decrease. As a result, cracks were more likely to generate at the wall–column joints, so the stiffness matching between the printed concrete wall and the cast-in-place side frame needed to be further coordinated to obtain a higher ductility. It turns out that the wall sections have little impact on the seismic performance of the members.
MODULATING CH 3 NH 3 PbI 3 PEROVSKITE CRYSTALLIZATION BEHAVIOR THROUGH PRECURSOR CONCENTRATION
KUNWU FU,SUBODH MHAISALKAR,SWEE SIEN LIM,PABLO P. BOIX,NRIPAN MATHEWS,YANAN FANG,LYDIA H. WONG,TZE CHIEN SUM 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.5
Perovskite-based photovoltaic devices have recently achieved impressively high e±ciencies be-yond 15% and gained great interest. We show here the formation of perovskite cluster overlayerstructures which consist of individual perovskite grains on top of mesoporous TiO 2 ¯lms, coex-isting with the randomly distributed nanocrystals within the ¯lms. Perovskite solution concen-tration was found to play an important role in modulating the perovskite crystallization andcluster overlayer formation process. Absorbance increase in visible wavelength range and shift ofphotoluminescence (PL) responses of perovskite ¯lms due to the e®ect of precursor concentrationchange were observed and investigated in detail. The crystallographic analysis of theCH 3 NH 3 PbI 3 ¯lms shows a gradual decrease of the perovskite lattice parameters and shrinkage ofunit volume as precursor solution concentration increases, which is correlated to the changes ofoptical properties. Finally, perovskite-based solar cell device performance was enhanced at higherprecursor concentration.
Shuwen Zhou,Haokun Fu,Shanshan Tao,Yanan Han,Mingrui Mao 서울시립대학교 도시과학연구원 2023 도시과학국제저널 Vol.27 No.-
The relation between planning and smart city development is interwoven. On the one hand, planning is being digitalized and ‘smartificated’, but threatened by the growing dominance of IT corporations in urban development. On the other hand, bottom-up smart initiatives at the neighbourhood level are emerging to challenge top-down control, but the relation between top-down and bottom-up approaches is conflicting and often disconnected. In the Chinese context, a newly established neighbourhood planning mechanism – community duty planners (CDPs) – appears to open up opportunities for bridging bottom-up and top-down approaches to smart city development. In Beijing, the CDPs are institutionalized under Beijing’s Refined Urban Management (RUM) framework which aims to improve the city’s built environment and quality of living. The CDPs play the role of intermediary actors connecting local government with the communities. The article is a reflection on the Shuangjing International Sustainable Development Community Pilot and the CDPs of Shuangjing Neighbourhood. It describes and reflects on how planning institutions can influence smart city development at the neighbourhood level and how bottom-up initiatives can be connected to long-term top-down plans.