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引导的定语从句用来修饰主语,isreviewed.Sofa

2、rtherearemanyversionsofthestatementsandproofsonthetheorem.However,thereexistsomelimitationsandlackofstrictnessintheseversions,forinstance,thediscussionoftheuniquenessofsolutionwithoutconsideringtheexistenceofsolutionandthelackofstrictnessinthecaseoflosslessmedium.Incontrastwiththetraditionalstate

3、mentsandproofs,thispaperintroducessomeimportantconclusionsonoperatorequationfrommoderntheoryofpartialdifferentialequation(PDE)andattemptstosolvetheproblemsontheexistenceanduniquenessofthesolutiontooperatorequationwhichisderivedfromMaxwell’sequationsoftime-harmonicelectromagneticfields.Thismethodp

4、rovidesanovelandrigorousapproachtoApproachto….的方法discussandsolvetheexistenceanduniquenessofthesolutiontotime-harmonicfieldsinthenewmathematicalframework.Someimportantconclusionsarepresented.1.IntroductionIntheelectromagneticsithasimportantsignificancetoresearchtime-harmonicelectromagneticfields.O

5、nonehand,mostfieldsappearedinpracticalengineeringproblems此处是过去分词做后置定语，修饰前面的mostfields,haveharmonictimevariationandwecansolvetheseengineeringproblemsdirectlythroughresearchingtime-harmonicfields.Ontheotherhand,time-varyingfieldscanbetransformedintothesuperpositionoftime-harmonicfieldswiththeFourie

6、rseriesorFouriertransform[1,2].Therefore,athoroughunderstandinganddiscussionontheexistenceanduniquenessofthesolutiontotime-harmonicelectromagneticfieldsareimportantinthestudyofallelectromagneticfieldsandelectromagneticwavephenomena.Thenecessityandimportanceoftheuniquenesstheoremconsistinthatifthe

7、appropriateinitial-boundaryvalueconditionsofMaxwell’sequationsaregiven,thenthesolutionisdetermineduniquely.Soregardlessofthemethodbywhichtheequationsaresolved定语从句修饰method,此处besolvedby的介词前置，实际上是theequationaresolvedbythe