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A multilevel analysis of the effects of disciplinary climate strength on student reading performance
Siwen Guo,Lingyan Li,Danhui Zhang 서울대학교 교육연구소 2018 Asia Pacific Education Review Vol.19 No.1
Climate strength was first conceptualised in the organisational psychology literature as the within-group agreement on the perceptions of climate. In contrast to the deep study of climate level, climate strength has not been clarified by school climate research. The purpose of this cross-cultural study is to identify the main effect of disciplinary climate strength on student reading performance, and its moderating effect on the relationship between disciplinary climate level and student reading performance. A multilevel analysis was conducted on 2009 data from the Programme for International Student Assessment (PISA) from Shanghai-China, Japan, and the United States (US). The result showed a significantly positive relationship between climate strength and student reading performance in Shanghai-China and the US. Moreover, a moderating effect of climate strength was found in Shanghai-China and the US. The effects of climate strength were further examined in strong and weak conditions. School-level predictors of climate strength were also examined. The differences in disciplinary climate strengths and their effects on student reading performance suggested some culture differences in these countries/areas.
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Substrate effect on phonon in graphene layers
Xiao Guo,Yongsong Wang,Siwen You,Dingbang Yang,Guiping Jia,Fei Song,Weidong Dou,Han Huang 한국탄소학회 2023 Carbon Letters Vol.33 No.5
Graphene exhibits high carrier mobility and concentration as well as other remarkable properties. Among them, the thermal behaviors of phonon modes play important roles in the application of optical and electronic devices. Here, A–A stacked graphene were proved well by Raman investigation on G and 2D modes. Temperature-dependent Raman scattering measurements on graphene with various number of layers on different substrates were conducted in the temperature range of 80–460 K. The first-order temperature coefficient of single layer graphene (SLG) on SiO2/ Si substrate is obviously smaller than that on Cu foil, indicating that the substrate effect attributes a great impact on graphene phonon temperature dependence. The first-order temperature coefficients of multilayer graphene linearly decrease as the number of layers increases, attributed to the reduction of substrate effect in phonon behaviors, rather than to the anharmonic phonon–phonon (ph–ph) coupling or thermal expansion.
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Emission properties of sequentially deposited ultrathin CH3NH3PbI3/MoS2 heterostructures
Shao Ziyi,Xiao Junting,Guo Xiao,You Siwen,Zhang Yangyang,Li Mingjun,Song Fei,Zhou Conghua,Xie Haipeng,Gao Yongli,Sun Jiatao,Huang Han 한국물리학회 2022 Current Applied Physics Vol.36 No.-
Hybrid organic-inorganic perovskite materials have obtained considerable attention due to their exotic optoelectronic properties and extraordinarily high performance in photovoltaic devices. Herein, we successively converted the ultrathin PbI2/MoS2 into the CH3NH3PbI3/MoS2 heterostructures via CH3NH3I vapor processing. Atomic force microscopy (AFM)、Scanning electron microscopy (SEM) and X-ray photoemission spectroscopy (XPS) measurements prove the high-quality of the converted CH3NH3PbI3/MoS2. Both MoS2 and CH3NH3PbI3 related photoluminescence (PL) intensity quenching in CH3NH3PbI3/MoS2 implies a Type-II energy level alignment at the interface. Temperature-dependent PL measurements show that the emission peak position shifting trend of CH3NH3PbI3 is opposite to that of MoS2 (traditional semiconductors) due to the thermal expansion and electron-phonon coupling effects. The CH3NH3PbI3/TMDC heterostructures are useful in fabricating innovative devices for wider optoelectronic applications.
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SOH Estimation Method for Lithium-ion Batteries Based on Partial Charging Voltage Segments
Xinwei Liu,Kai Lyu,Siwen Chen,Yilong Guo,Shiyou Xing,Di Wang,Jinlei Sun 전력전자학회 2023 ICPE(ISPE)논문집 Vol.2023 No.-
The state of health (SOH) estimation of lithiumion battery is considered a key component of battery management. A SOH estimation method for lithium-ion batteries, which is based on the partial charging voltage segments, is proposed. The voltage data segments was extracted, and the charging time series corresponding to each mv voltage value was reconstructed by interpolation method, which is used as the input of the RNN network. Finally, the estimated SOH value was obtained. The proposed method was applied to CALCE dataset, and accurate estimation result of SOH can be achieved with only 0.1v voltage segment data.
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Zhenzhen Zhi,Jian Huang,Yanfei Guo,Siwen Lu,Baoguo Ma 대한토목학회 2017 KSCE JOURNAL OF CIVIL ENGINEERING Vol.21 No.5
Phosphorus Gypsum (PG) based Self-Leveling mortar (GSL) is a green and efficient material for floor construction. Its hydration kinetics, rheology property and their effect on mechanical strength of hydrated GSL were crucial to its final application. This study analyzed the effect on setting time of three retarders, namely Protein Salt (PS), Citric Acid (CA), and Sodium Tripolyphosphate (STPP). The fluidity of GSL was investigated individually using three different types of superplasticizer, namely naphthalene (FDN), polycarboxylate (PCE) and melamine (MSF). Finally, the effect of these chemical admixtures on mechanical properties of GSL hardened was examined. Results showed that the optimal contents of PS were 0.1%-0.15% by weight. With 0.1% PS, setting time of GSL retarded to 80min. To reach a maximum fluidity of GSL to 350mm, the optimal contents of PCE, MSF and FDN were 0.2%, 0.6% and 1.0% respectively and corresponding compressive strength of GSL were 54.25MPa, 53MPa and 52.25MPa. Suggesting PCE is the most effective dispersant in PG based GSL system.
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