2013届毕业论文模(计算书)2013届毕业论文模板(计算书).doc

13届 　 分 类 号: 　　　　　　　　　　　　　　　　　 单位代码:10452 毕业论文（设计） 地图在地理教学中的应用 　　　　　　 姓 名　 　　　　 李雪芹　　　　　 　　　　　　 学 号　　　2013年4月18日摘　要 由于“应试教育”向素质教育转轨，是我国基础教育的重大改革。地理教育具有诸多优先发展的条件，每位地理教师都应不失时机，自加压力，研究教法，为全面提高学生素质作出新的贡献。 而地图是地理学科独有的一种语言，师生在读图用图的过程中，可以丰富课堂内容和形式，激发学生的学习兴趣，培养学生的思维能力。而且由于地图具有直观形象，对比鲜明等实际优势，在实际教学中如能灵活的运用地图，能够较为直观的反映大量的地理信息，在教学中通过地图进行地理特点更为突出的教学，能帮助学生更好的认识地理，热爱地理。 本文对论题的研究采取了比较和举例说明的方法，从剖析现今的教育趋势开始，借助一些具体方法，重点研究了地图在地理教学中对学生产生的重要作用，并提出教师该如何应用地图，以期进一步在提高学生成绩的同时，加强学生素质的培养和实践能力的提升。 关键词：地图；地理教学；应用；  ABSTRACT An alternative process was developed to prepare smaller and nearly monodispersed thiol-stabilized platinum nanoparticles. The procedure involves the reduction of a Pt(IV) precursor salt by a small (10%) stoichiometric excess of sodium borohydride in the presence of a toluene solution of 1-dodecanethiol. Complete　reduction of the Pt precursor was confirmed by elemental analysis and UV-vis spectroscopy. The platinum nanoparticles prepared as such could be transferred directly to the toluene layer without the addition of concentrated hydrochloric acid that was previously reported as essential for the transfer to take place. TEM imaging shows a mean particle diameter of 2.6 nm and a nearly monodispersed particle size distribution. These results were used to formulate a protocol to prepare oligonucleotide-stabilized Pt nanoparticles with narrow particle size distribution and excellent stability in aqueous solutions. An alternative process was developed to prepare smaller and nearly monodispersed thiol-stabilized platinum nanoparticles. The procedure involves the reduction of a Pt(IV) precursor salt by a small (10%) stoichiometric excess of sodium borohydride in the presence of a toluene solution of 1-dodecanethiol. Complete　reduction of the Pt precursor was confirmed by elemental analysis and UV-vis spectroscopy. The platinum nanoparticles prepared as such could be transferred directly to the toluene layer without t