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绘本作为幼儿的第一本读物,它是早期亲子共读主要的载体,也是幼儿园教学重要的媒介。基于其对幼儿发展的重要性,绘本如今在世界范围迅速风靡,国内针对绘本教学的研究也逐渐丰富。文章将从绘本的概念与特质、发展概况、教育价值,以及绘本教学中资源的开发与利用、教师的角色与作用、存在的问题以及实施的策略等方面来对已有研究进行梳理,为日后的研究提供一定的借鉴作用。 相似文献
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Correct extraction of the ultra-large-scale integrated (ULSI) interconnect components at hight frequencies is very important for evaluating electrical performances of high-speed ULSI circuits. In this paper, the extraction of the interconnect resistance at high frequencies is derived from the Ohm‘s law and verified by the software FastHenry. The results are also compared with those of another resistance formula originated from the effective area of the current flowing. The applicability of these two formulae is discussed. The influence of the interconnect geometry on the resistance at high frequencies is studied. The computation indicates that the effect of frequency on the resistance is weak when the skin depth is larger than half of the short side of the rectangular interconnect cross section. With further increase of frequency, the resistance increases obviously. Results imply that conductor with a square cross section exhibits the largest resistance for rectangular conductors of constant cross section area. 相似文献
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肖夏 《语数外学习(初中版)》2004,(11):10-11
假如你要穿过一片茂密的森林,出发前给你两种选择:一是足够的干粮;一是一杆猎枪,并教你如何使用它。如果在这二之中只能选择一种,你会选择哪一种呢?我想,大多数人都会选择后,因为他们大都会这样想:只选择干粮,如果遭遇野兽侵袭的危险,便无法抵抗甚至连命都会保不住。而有了猎枪,不仅能自卫或逃离危险,还能用它打到猎物,得到更多更好的口粮,这岂不是一举两得之事? 相似文献