| 1 | How Chinese Teach Mathematics:Canadian Teachers’Perspectives显示文摘As part of a large reciprocal learning partnership project between Canada and China,this study explored Canadian teachers’perceptions of mathematics teaching in elementary schools in China.Using reciprocal learning and Activity Theory as the theoretical lens,we collected data,i.e.,classroom observations,group discussion,and informal exchanges from teachers in a pair of research sister-schools in Canada and China.Qualitative data analyses revealed four themes in Canadian teachers’perceptions of the characteristics of Chinese mathematics teaching:an active teacher-student interaction model of questioning-responding,a mathematical knowledge-package summary at the end of each lesson,integration of the history of mathematics into teaching,and the development and implementation of well-structured lessons.Contributions,implications,and limitations of the study in mathematics education and research are discussed. | PENG Aihui Li CAO | 2021 | Frontiers of Education in China2021，16，1： | 1 |
| 2 | Strongly Coupled Ag/Sn-SnO_(2)Nanosheets Toward CO_(2)Electroreduction to Pure HCOOH Solutions at Ampere‑Level Current显示文摘Electrocatalytic reduction of CO_(2) converts intermittent renewable electricity into value-added liquid products with an enticing prospect,but its practical application is hampered due to the lack of high-performance electrocatalysts.Herein,we elaborately design and develop strongly coupled nanosheets composed of Ag nanoparticles and Sn-SnO_(2) grains,designated as Ag/Sn-SnO_(2) nanosheets(NSs),which possess optimized electronic structure,high electrical conductivity,and more accessible sites.As a result,such a catalyst exhibits unprecedented catalytic performance toward CO_(2)-to-formate conversion with near-unity faradaic efficiency(≥90%),ultrahigh partial current density(2,000 mA cm^(−2)),and superior long-term stability(200 mA cm^(−2),200 h),surpassing the reported catalysts of CO_(2) electroreduction to formate.Additionally,in situ attenuated total reflection-infrared spectra combined with theoretical calculations revealed that electron-enriched Sn sites on Ag/Sn-SnO_(2)NSs not only promote the formation of*OCHO and alleviate the energy barriers of*OCHO to*HCOOH,but also impede the desorption of H*.Notably,the Ag/Sn-SnO_(2)NSs as the cathode in a membrane electrode assembly with porous solid electrolyte layer reactor can continuously produce~0.12 M pure HCOOH solution at 100 mA cm^(−2)over 200 h.This work may inspire further development of advanced electrocatalysts and innovative device systems for promoting practical application of producing liquid fuels from CO_(2). | Min Zhang Aihui Cao Yucui Xiang Chaogang Ban Guang Han Junjie Ding Li‑Yong Gan Xiaoyuan Zhou | 2024 | Nano-Micro Letters2024，16，3： | 0 |
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