简介:摘要:《义务教育语文课程标准(2011年版)》在教学建议的具体建议中明确提出,写作教学目标要重视“写作教学与阅读教学,口语教学之间的联系,善于将读与写,说与写有机结合,相互促进。”统编版教材也更加关注学生读写听说能力的发展,学生课堂上习得的读写听说能力,最终都要适应社会的发展。然而,我们在教学中发现,由于学生知识水平和生活经验的不足,学生没办法将读写听说进行实践。因此,我以统编教材五年级下册第二单元口语交际“我们都来演一演”为载体,让学生在编课本剧、演课本剧过程中,充分发挥个人潜能,聚焦“读、写、听、说”,构建学习共同体,尊重大家的共同决定,明白合作、共同学习的重要性,在自主探究、交流和演一演的过程中,提高读、写、听、说语文素养。
简介:Inmarineseismicexploration,ocean-bottomcabletechniquesaccuratelyrecordthemulticomponentseismicwavefield;however,theseismicwavepropagationinfluid–solidmediacannotbesimulatedbyasinglewaveequation.Inaddition,whentheseabedinterfaceisirregular,traditionalfinite-differenceschemescannotsimulatetheseismicwavepropagationacrosstheirregularseabedinterface.Therefore,anacoustic–elasticforwardmodelingandvector-basedP-andS-waveseparationmethodisproposed.Inthismethod,wedividethefluid–solidelasticmediawithirregularinterfaceintoorthogonalgridsandmaptheirregularinterfaceintheCartesiancoordinatessystemintoahorizontalinterfaceinthecurvilinearcoordinatessystemofthecomputationaldomainusingcoordinatestransformation.Theacousticandelasticwaveequationsinthecurvilinearcoordinatessystemareappliedtothefluidandsolidmedium,respectively.Attheirregularinterface,thetwoequationsarecombinedintoanacoustic–elasticequationinthecurvilinearcoordinatessystem.Wenextintroduceafullstaggered-gridschemetoimprovethestabilityofthenumericalsimulation.Thus,separateP-andS-waveequationsinthecurvilinearcoordinatessystemarederivedtorealizetheP-andS-waveseparationmethod.