摘要：《小学数学问题化学习课堂实践手册》一书是一本关于小学阶段数学问题化学习的课堂教学指导手册,该书的作者团队以转变学生学习方式为出发点,在总结十多年的研究与实践教学成果基础上得以成书。书中主要展现了小学阶段数学学科问题化学习三个层次的研究成果,包括理论探索、实践指导以及课堂应用,以求更好地指导小学数学教师在课堂教学中以学生问题、学科问题为出发点,实现基础学习方式改变的课堂转型。

摘要：Designing highly efficient Pt-free electrocatalysts with low overpotential for an alkaline hydrogen evolution reaction(HER)remains a significant ***,a novel and efficient cobalt(Co),ruthenium(Ru)bimetallic electrocatalyst composed of CoRu nanoalloy decorated on the N-doped carbon nanotubes(CoRu@N-CNTs),was prepared by reacting fullerenol with melamine via hydrothermal treatment and followed by *** from the electronic communication between Co and Ru sites,the as-obtained CoRu@N-CNTs catalyst exhibited superior electrocatalytic HER *** deliver a current density of 10 mA·cm^(-2),it required an overpotential of merely 19 mV along with a Tafel slope of 26.19 mV·dec^(-1)in 1 mol·L^(-1)potassium hydroxide(KOH)solution,outperforming the benchmark Pt/C *** present work would pave a new way towards the design and construction of an efficient electrocatalyst for energy storage and conversion.