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Four novel organometallic compounds containing tin(Ⅳ),titanium(Ⅳ) and zirco-nium(Ⅳ) ions were synthesized and strong fluorescent emission was observed from two tin(Ⅳ) complexes. 相似文献
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依据新的化学课程标准,学习方法和学习策略的重点,由过去只重视书本知识的学习转向强调信息的收集、加工、处理及知识的建构、应用能力的培养。因此,培养学生的科学探究能力和信息素养是目前中学化学教学中关键的一环。本文着眼于在学科教学中利用网络资源,注意化学学科的特点,运用多种教学模式,对现行条件下网络教学与化学教学的融合,进行了初步探索。 相似文献
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网络及网络资源的有效利用,将是缩短西部与发达地区教育水平差异的最佳途径。本文介绍了目前中学西部校园网应用网络教育资源的现状及在新疆克拉玛依市一中利用网络教育资源进行研究型化学教学的课例。 相似文献
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Graphene is an alternative material for photodetectors owing to its unique properties.These include its uniform absorption of light from ultraviolet to infrared and its ultrahigh mobility for both electrons and holes.Unfortunately,due to the low absorption of light,the photoresponsivity of graphene-based photodetectors is usually low,only a few milliamps per watt.In this letter,we fabricate a waveguide-integrated graphene photodetector.A photoresponsivity exceeding0.11 A·W ~(-1) is obtained which enables most optoelectronic applications.The dominating mechanism of photoresponse is investigated and is attributed to the photo-induced bolometric effect.Theoretical calculation shows that the bolometric photoresponsivity is 4.6 A·W ~(-1).The absorption coefficient of the device is estimated to be 0.27 dB·μm ~(-1). 相似文献