简介:摘要怎样才能将枯燥的文字变得“优美”?是靠增添内容以求丰富,还是靠变化讲法以求新变,抑或是淡化讲解以求突出学生的主体地位?其实,具体就讲解汉字结构而言,知识性强,枯燥难解,似乎以上方法都不应该放在最主要的位置。本文作者力图从打造教师的优美的授课语言,用语言之美诠释汉字之美,从而做到相得益彰,和谐生美的角度,提出了自己独到的见解,值得深思。
简介:一座城市的温度,来自于生命中那些重要的人,他们像静默的路标,盘踞在城市的隐秘之处,与成长的脉络一同延展。一、雪花的故居我出生时,天降大雪,悄然无息。并没有初次降临人间的哭啼,因为脐带绕着脖子,所以是安静地
简介:CuSpinealmicrospherescongregatedfrominterleavingnanoflakeswiththicknessof40to200nmweresynthesizedbyapyridine-solvothermalprocessviathereactionbetweencupricchloride(CuCl2·2H2O)andthioacetamide(TAA,CH3CSNH2).TheproductswerecharacterizedbyX-raydiffractionandscanningelectronmicroscopy.UV-Visabsorptionspectrum,excitationandphotoluminescencespectraofCuSpinealmicrosphereswereobtainedatroomtemperaturetoinvestigatetheiropticalproperties.ApossiblegrowthmechanismontheformationofCuSpinealmicrospheresisproposed.ThefactorsinfluencingtheevolutionofmorphologiesofCuScrystalsincludingthedosageofthereactants,surfactant,andsulphur-sourcewerealsoanalyzed.
简介:CuSmicrocrystalsweresuccessfullypreparedthroughamildsolvothermalreactioninethyleneglycol(EG)withtheassistanceofcationicsurfactantcetyltrimethylammoniumbromide(CTAB).Aninterestingmorphologyevolutionfromflower-likemicrospherestohollowmicrospheres,andfinallytosmoothnanoflakeswasobservedwhenincreasingtheamountofCTAB.TheproductswerecharacterizedbyX-raydiffraction(XRD),scanningelectronmicroscopy(SEM),transmissionelectronmicroscopy(TEM),andUV—visspectroscopy.ItwasfoundthattheamountofCTABplayedanimportantroleindeterminingthemorphologyoftheCuSmicrocrystals.Electricalmeasurementrevealsthattheas-preparedCuSmicrosphereswereofhighconductivity,whichmightfavortheirdeviceapplications.ItisexpectedthatCuSmicrocrystalswithcontrolledmorphologiesandstructureswillhaveimportantapplicationsinsolarcells.Thissimplebuteffectivemethodcouldalsobeextendedtothecontrolledgrowthofotherinorganicmicrocrystals.