科技英语写作授课.pptVIP

论文人称和时态一、科技论文要求叙述客观，读者关注作者的研究内容和结论，而非作者本人，所以应避免使用。二、论文常用时态1.叙述论文研究之前所进行的工作（通常出现在论文的部分）具体时间或具体人的一般采用；对以前工作的总结一般采用。Leeetal.[17](report)aso-called‘hardanodization’approachtoobtainhighlyorderedPAAwithawiderangeofporesizesandinterporedistances.Alotofwork(devote)toinvestigatingtheformationmechanismsofPAA[4–8],andconsiderableresearchefforts(direct)towardthefabricationofthePAAwithlong-rangeorderednanoholes[9–18].*2.实验经过、实验过程的描述通常采用。Thespectra(record).Thestructure(determine)byneutrondiffractionmethods.Theelectrolytesolutions(prepare)fromreagentgradechemicalsanddeionizedwater.ThemorphologyofthePAAfilm(characterize)byfield-emissionscanningelectronmicroscopy(FE-SEM,HitachiS-4800).*3.图表介绍、公式说明、实验结果、实验结论等通常采用。Fig.3（show)SEMimagesoftheas-preparedsamples.InordertofurtherunderstandtheeffectofEGonthemorphologyofPAA,EISmeasurements(carry)outforthefilmsobtainedinEGandaqueoussolutions.Impedancespectraforthefilms(illustrate)inFig.5intheformofBodeplot.ThePAAfilmsformedinbothEGandaqueoussolutions(exhibit）aquasilinearchangeintheimpedancemodulusintheexperimentalfrequencyrangewithaslopecloseto1.*总之：?表示“报道、研究、综述”等，通常用一般现在时InthispaperwereportthesynthesisofRFCcontainingbariumferriteaccordingtoaspecificmethodanditsevaluationofdielectricandmechanicalproperties.Theprobablemodeofevolutionisdiscussed.??叙述他人已报道的内容用一般过去时或现在完成时Inthepastdecadepublicattentionmoreandmorefocusedonthepotentialapplicationsofrenewableresources.?表示研究过程的行为通常用一般过去时HighDensityPolyethylene(HDPE)waskindlysuppliedbyFIAT(Italy).TheHDPEwasblendedwiththeLDPE,inthemoltenstateathightemperature(200℃),usingaBrabenderblender,equippedwithrotatingblades.?表示实验结果及其产生的原因,通常用一般现在时Tensil