西安电子科技大学 研究生 科技英语作业

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1、科技英语阅读与写作题目：HarringtonTime-HarmonicElectromagneticFields学院：物理与光电工程学院专业：电子与通信工程学号：1405122310姓名：何超Partner姓名：张书彬学号：1403121555ABSTRACTTheuniquenesstheoremoftime-harmonicelectromagneticfields,whichisthetheoreticalbasisofboundaryvalueproblem(BVP)ofelectromagneticfieldsWhich引导的

2、定语从句用来修饰主语,isreviewed.Sofartherearemanyversionsofthestatementsandproofsonthetheorem.However,thereexistsomelimitationsandlackofstrictnessintheseversions,forinstance,thediscussionoftheuniquenessofsolutionwithoutconsideringtheexistenceofsolutionandthelackofstrictnessintheca

3、seoflosslessmedium.Incontrastwiththetraditionalstatementsandproofs,thispaperintroducessomeimportantconclusionsonoperatorequationfrommoderntheoryofpartialdifferentialequation(PDE)andattemptstosolvetheproblemsontheexistenceanduniquenessofthesolutiontooperatorequationwhichi

4、sderivedfromMaxwell’sequationsoftime-harmonicelectromagneticfields.ThismethodprovidesanovelandrigorousapproachtoApproachto….的方法discussandsolvetheexistenceanduniquenessofthesolutiontotime-harmonicfieldsinthenewmathematicalframework.Someimportantconclusionsarepresented.1.I

5、ntroductionIntheelectromagneticsithasimportantsignificancetoresearchtime-harmonicelectromagneticfields.Ononehand,mostfieldsappearedinpracticalengineeringproblems此处是过去分词做后置定语，修饰前面的mostfields,haveharmonictimevariationandwecansolvetheseengineeringproblemsdirectlythroughrese

6、archingtime-harmonicfields.Ontheotherhand,time-varyingfieldscanbetransformedintothesuperpositionoftime-harmonicfieldswiththeFourierseriesorFouriertransform[1,2].Therefore,athoroughunderstandinganddiscussionontheexistenceanduniquenessofthesolutiontotime-harmonicelectromag

7、neticfieldsareimportantinthestudyofallelectromagneticfieldsandelectromagneticwavephenomena.Thenecessityandimportanceoftheuniquenesstheoremconsistinthatiftheappropriateinitial-boundaryvalueconditionsofMaxwell’sequationsaregiven,thenthesolutionisdetermineduniquely.Soregard

8、lessofthemethodbywhichtheequationsaresolved定语从句修饰method,此处besolvedby的介词前置，实际上是theequationaresolvedbythe