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- 저자 : Menghan Sun (검색결과 4 건)
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Nian Cheng,Weiwei Li,Menghan Zhang,Hangjuan Wu,Shujie Sun,Zhiqiang Zhao,Zhenyu Xiao,Zhuzhu Sun,Wei Zi,Liang Fang 한국물리학회 2019 Current Applied Physics Vol.19 No.1
Employing additive to regulate the morphology of perovskite film is an effective method to enhance both the power conversion efficiency and long term stability of organic-inorganic hybrid perovskite solar cells. Here, we demonstrate that guanidinium thiocyanate (GuSCN) is a suitable additive for methylammonium lead iodide (MAPbI3) perovskite materials. Addition of GuSCN into MAPbI3 can simultaneously enhance the crystallinity, enlarge the crystal size, and reduce the trap density of the perovskite films. As a result, the MAPbI3 perovskite with 10% GuSCN exhibits superior power conversion efficiency of 16.70% compared to the pristine MAPbI3 perovskite solar cell (15.57%). At the same time, the MAPbI3 perovskite solar cell with GuSCN additive shows better stability, power conversion efficiency retains ∼90% of its initial value compared to only ∼60% for pristine MAPbI3 perovskite solar cells after being stored for 15 days without encapsulation
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Feng Fan,Dewen Kong,Menghan Sun,Xudong Zhi 한국강구조학회 2014 International Journal of Steel Structures Vol.14 No.4
As a typical base isolation device, the friction pendulum bearing (FPB) was applied to the lattice grid structures in this paper. The isolation mechanism of FPBs was analyzed from two aspects of force and energy consumption, while the static anddynamic mechanical properties of lattice grid structures with FPBs were numerically investigated using two models of regularand oblique quadrangular pyramid framed structures. The physical models of FPBs with fictional coefficient of 0.1 and acurvature radius of 1.0 m was established and applied to the lattice grid structures. Moreover, the mechanical properties of thesestructures with FPBs ware studied. Numerical results indicate that the seismic response of structures is remarkably weakenedby using FPBs, which means FPBs can be used to effectively control structural vibration.
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Seismic Coefficients and Earthquake Damage Predictions for a Space Truss with a Supporting Structure
Zailin Yang,Ziwen Wang,Yang Yong,Menghan Sun 한국강구조학회 2022 International Journal of Steel Structures Vol.22 No.4
Previous studies have shown that when the lower support structure is considered, the dynamic characteristics of grid structures change signifi cantly, and the stress distributions are also noticeably diff erent. Therefore, this paper discusses whether other simple and feasible structural seismic damage prediction methods could be proposed after accounting for the infl uence of the lower supporting structure. Considering diff erent site types and diff erent intensities, a time-history analysis was conducted using the mode decomposition response spectrum method for frequent 8- and 9-degree earthquake intensity. Then, the acceleration response spectra for diff erent sites experiencing 8- and 9-degree intensity of frequently occurring earthquakes specifi ed in the Code for Seismic Design of Buildings (GB50011-2010) were used to calculate and discuss the distribution law for the seismic internal forces of space truss structures. Based on the calculation conclusion, the design method and damage prediction method for a plate-like space truss structure under earthquake actions are discussed. Then, a new value of the seismic action coeffi cient was proposed in this paper, and the ground motion peaks for various types of earthquake damage for diff erent site types were obtained using the functional relationship.
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Push-Out Tests on Interlocked Angles Connectors in Steel-Concrete-Steel Composite Structure
Junyi Chen,Yonghui Wang,Ximei Zhai,Xudong Zhi,Menghan Sun 한국강구조학회 2023 International Journal of Steel Structures Vol.23 No.2
This paper reported a new interlocked angle connector (IAC) for steel-concrete-steel sandwich structures. Shear performances of IACs embedded in normal concrete were studied via a push-out testing program, and the failure mode, shear resistance, and load–slip responses of IACs in normal concrete were obtained. The influences of height, width, thickness, orientation of steel angles, and interlocking bolts on shear behaviours of IACs were experimentally studied. The experimental results indicated that the ultimate shear resistances and slip capacities of IACs were improved via increasing the height, width and thickness of steel angles, while the orientation of steel angles exhibited limited influence on the ultimate shear resistances and failure modes of IACs. In addition, the analytical models were proposed for predicting ultimate shear resistances and load–slip behaviours of IACs. The experimental results were employed to validate the analytical models, and the proposed analytical models were found to provide more accurate predictions on ultimate shear resistances and load–slip behaviours of IACs as compared to the existing design codes.
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