西安电子科技大学研究生科技英语作业

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1、液4爰？利7以專科技英语阅读与写作题目：HarringtonTime-HarmonicElectromagneticFields学院：物理与光电丄程学院专业：电子与通信丁.程学号：1405122310姓名：何超Partner姓名：张书彬学号：1403121555ABSTRACTTheuniquenesstheoremoftime-harmonicelectromagneticfields,whichisthetheoreticalbasisofboundaryvalueproblem(BVP)ofelectromagneticfields,isreviewed.①Sofartherear

2、emanyversionsofthestatementsandproofsonthetheorem.However,thereexistsomelimitationsandlackofstrictnessintheseversions,forinstance,thediscussionoftheuniquenessofsolutionwithoutconsideringtheexistenceofsolutionandthelackofstrictnessinthecaseoflosslessmedium.②Incontrastwiththetraditionalstatementsan

3、dproofs,thispaperintroducessomeimportantconclusionsonoperatorequationfrommodemtheoryofpartialdifferentialequation(PDE)andattemptstosolvetheproblemsontheexistenceanduniquenessofthesolutiontooperatorequationwhichisderivedfromMaxwell'sequationsoftime-harmonicelectromagneticfields.@Thismethodprovides

4、anovelandrigorousapproachtodiscussandsolvetheexistenceanduniquenessofthesolutiontotime-harmonicfieldsinthenewmathematicalframework.Someimportantconclusionsarepresented.1.IntroductionIntheelectromagneticsithasimportantsignificancetoresearchtime-harmonicelectromagneticfields.④Ononehand,mostfieldsap

5、pearedinpracticalengineeringproblemshaveharmonictimevariationandwecansolvetheseengineeringproblemsdirectlythroughresearchingtime-harmonicfields.Ontheotherhand,time-varyingfieldscanbetransformedintothesuperpositionoftime.harmonicfieldswiththeFourierseriesorFouriertransform[1,21.Therefore,athorough

6、understandinganddiscussionontheexistenceanduniquenessofthesolutiontotime-harmonicelectromagneticfieldsareimportantinthestudyofallelectromagneticfieldsandelectromagneticwavephenomena.⑤Thenecessityandimportanceoftheuniquenesstheoremconsistinthatiftheappropriateinitial-boundaryvalueconditionsofMaxwe

7、ll'sequationsaregiven,thenthesolutionisdetermineduniquely•⑥Soregardlessofthemethodbywhichtheequationsaresolved,thesamesolutionwillbeobtained.Recently,theissueontheuniquenesshasarousedmuchconcern[3-9].⑦Inthispaperwemain