简介:摘要小学语文教学大纲指出“阅读教学是小学语文教学的基本环节……要能够使学生获得多方面的知识,受到思想教育和美的熏陶。”可以说,小学语文教材中的每一篇文章都渗透着美的因素,都有着发展学生审美理解的广阔天地。这就要求教师在阅读教学中必须以语言文字为载体,以情感体验为手段去完成阅读教学的任务。
简介:Wavediffractionoftwoconcentricporouscylinderswithvaryingporositywasstudiedbyusingananalyticalmethodbasedoneigenfunctionmatching.Thefluiddomainaroundthecylindersisdividedintothreesub-domainsandineachsub-domainaneigenfunctionexpansionofthevelocitypotentialisobtainedbysatisfyingtheLaplaceequation,theboundaryconditionsonthefreesurfaceandontheseabed.Theunknowncoefficientsofeigenfunctionexpansionsaredeterminedbyboundaryconditionsontheporoushulls.Inthepaper,theboundaryconditionsarebasedupontheassumptionthattheflowintheporousmediumisgovernedbyDarcy’slaw.Twoporous-effectparametersappliedontwoporouscylindersarefunctionsoftheverticalcoordinateinsteadoftheconstant.Waveloadingontheouterandinnercylinderispresentedinthenumericalresults.