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ID:51205006
大小:1.09 MB
页数:55页
时间:2020-03-20
《学术英语写作Unit6.Introduction.ppt》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、1Unit6HowtoWritetheIntroduction2TeachingProceduresLead-in1SampleAnalysis2BuildingaModel3GrammarandWritingSkills431.WhatinformationshouldbecontainedintheIntroduction?Lead-inBackgroundLiteratureReviewUnresolvedQuestionThePresentPaper42.Whatisthepurposeofwriting
2、theIntroduction?3.HowdoestheIntroductiondifferfromtheAbstract?4.HowdowritersnormallystarttheIntroduction?5.WhattypeofinformationshouldbeincludedintheIntroduction,andinwhatorder?6.HowdowritersnormallyendtheIntroduction?5TypicalcomplaintsofrefereesTheIntroductiono
3、ccupiestoohighaproportionoftheentirepaperandcontainstoomanygeneralstatementsthatarewidelyknown.Therationalandobjectivesarenotdefinedandthewholesectioniscompletelydisorganized-itisnotclearwhatproblemtheauthorisaddressingortryingtosolveandwhytheychosetheirparticul
4、armethodology.MuchoftheinitialpartisessentiallyacutandpastefromtheAbstract.6Theauthorhasnotrelatedthebackgroundinformationtotheobjectiveofthepaper.PleaserememberthatthepapermaybereadbyinexperiencedPh.D.studentsorothersstartingtheirworkinyourspecificfield.Hence,p
5、leaseaddanexplanationoratleastareferencewhenmentioningnotionsrelatedto…andterminologyfor…7Introduction1.Polylactide(PLA)hasreceivedmuchattentioninrecentyearsduetoitsbiodegradableproperties,whichofferimportanteconomicbenefits.2.PLAisapolymerobtainedfromcornandisp
6、roducedbythepolymerizationoflactide.3.Ithasmanypossibleusesinthebiomedicalfield1andhasalsobeeninvestigatedaspotentialengineeringmaterial.2,34.However,ithasbeenfoundtobetooweakunderimpacttobeusedcommercially.45.Onewaytotoughenpolymersistoincorporatealayerofrubber
7、particles5andtherehasbeenextensiveresearchregardingtherubbermodificationofPLA.6.Forexample,Penneyetal.showedthatPLAcompositescouldbepreparedusingblendingtechniques6andmorerecently,Hillierestablishedthetoughnessofsuchcomposites.77.However,althoughtheeffectoftheru
8、bberparticlesonthemechanicalpropertiesofcopolymersystemswasdemonstratedovertwoyearsago,8littleattentionhasbeenpaidtotheselectionofanappropriaterubbercomponent.8.Thepr
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