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《黑龙江环境通报》2014,(25)
游戏是幼儿的基本活动,是促进幼儿学习与发展的重要途径。幼儿园的结构游戏融操作性、艺术性、创造性于一体,作为课程,蕴含着有益于幼儿发展的隐形教育潜能。我园在课程领导中不断思索,寻求幼儿园发展特色,实施促进幼儿园科学保教的策略。我们立足于幼儿、立足于教师,从实际出发,从结构游戏课程研究开始,去思索幼儿的游戏、学习与发展问题,深入研究幼儿园结构游戏的组织与指导,践行课程领导策略。从游戏课题这一研究视角进行引领,运用《指南》指导思想进一步优化结构游戏的研究方向,提升办园保教水平。主要从建构结构游戏课题的愿景和目标,建立课题实践的组织机构,引领教师专业发展,课题研究卓有成效等维度,且思且行,浅谈践行结构游戏课题关注的视角。 相似文献
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Max Hartmann 《Die Naturwissenschaften》1944,32(27-39):231-231
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采用溶胶凝胶法制备了双主金属、双助剂的CuxMn1-xCe0.75Zr0.25Oy催化剂,在固定床反应器中评价了催化剂降解甲苯的性能,并采用XRD、H2-TPR、O2-TPD和Raman对催化剂进行表征。试验结果表明:催化剂中Cu含量的增加有助于增强Cu-Ce金属之间的相互作用,增加催化剂中的氧空位浓度和晶格氧含量,提高催化剂低温还原性,从而促进催化活性的提高。Cu1CeZr催化剂降解甲苯活性最好,其完全降解甲苯的温度(T100)为220℃,比Mn1CeZr催化剂低60℃。 相似文献
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《环境科学学报(英文版)》2023,35(3):691-700
Oxidation of Mn(II) or As(III) by molecular oxygen is slow at pH < 9, while they can be catalytically oxidized in the presence of oxide minerals and then removed from contaminated water. However, the reaction mechanisms on simultaneous oxidation of Mn(II) and As(III) on oxide mineral surface and their accompanied removal efficiency remain unclear. This study compared Mn(II) oxidation on four common metal oxides (γ-Al2O3, CuO, α-Fe2O3 and ZnO) and investigated the simultaneous oxidation and removal of Mn(II) and As(III) through batch experiments and spectroscopic analyses. Among the tested oxides, CuO and α-Fe2O3 possess greater catalytic activity toward Mn(II) oxidation. Oxidation and removal kinetics of Mn(II) and As(III) on CuO indicate that O2 is the terminal electron acceptor for Mn(II) and As(III) oxidation on CuO, and Mn(II) acts as an electron shuttle to promote As(III) oxidation and removal. The main oxidized product of Mn(II) on CuO is high-valent MnOx species. This newly formed Mn(III) or Mn(IV) phases promote As(III) oxidation on CuO at circumneutral pH 8 and is reduced to Mn(II), which may be then released into solution. This study provides new insights into metal oxide-catalyzed oxidation of pollutants Mn(II) and As(III) and suggests that CuO should be considered as an efficient material to remediate Mn(II) and As(III) contamination. 相似文献
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