学术交流英语演讲稿.docx

学术交流英语演讲稿.docx

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学术交流英语演讲稿

学术交流英语演讲稿

　　篇一：

学术交流英语PPT讲稿

　　30s

　　Goodafternoon,everyone.ThetitleofthepaperisVisibleMicrospectroscopyforDiagnosisofGastricPrecancer.ItsauthorisLiuYongfromDepartmentofPhysics,ZhaoqingUniversity.It’spresentedbyLiMengfanfromCAS,HefeiInstitutesofPhysicalScience.Youcanknowmoreaboutcancerandthenewmethodtodiagnosegastricprecancerafterreadingthispaper.

　　58s

　　Cancerisverycommonamonghumanbeings.Itismostlyrelatedtothehabitofthepatients,thejob,theenvironment,thedrinkingwaterandthesoilmatters,too.Ifapersonisaffectedbycertainbacteria,hemayalsogetgastriccancer.Badhabitslikesmoking,drinking,mentaltension,eatingimproperlyandlivingirregularlyincreasethepossibilityofhavingcancer.Beforespecifictreatment,thedoctorshouldmakesurewhetherthepatienthascancerandwherethefocusis.Themethodusedtodiagnosecancerandlocatethe

　　cancerousareaisveryimportant.

　　42s

　　Beforewedesignamethodtodiagnosecancer,weshouldknowmoreaboutcancerlikewhereitstartsandwhatitcauses.Firstly,about90%ofthehuman’scancerstartfromtheepitheliallayerofskin,internal

　　organsandtubularorgansinthebody.Secondly,cancerusuallyaccompaniedbythechangesoforganizationstructureinthecelllevel.So,thechangeswhichappearinthestructureoforganizationandchemicalcompositionprovidesimportantevidencefordiagnosisofprecancer.

　　42s

　　NormalmethodtodiagnosegastricprecancerisReflectancespectroscopy.It’sveryprospectiveinearlydiagnosisofcancerandiscommonlyusedtheseyears.

　　Oneofthemostcommontechnologyisdiffusereflectancevisiblespectroscopy,itcanacquiretheapproximateinformationofthetargettissue.Thismethodislowcost,fastandnon-invasive,itprovidesimportantmeansfordiagnosisofmalignantdamageoforganizationofhumanorgans.However,therearealsosomedisadvantagesofthismethodwhichneedtobeimproved.

　　55s

　　Thisisthesystemofdiffusereflectancespectroscopy,thelightbeamemittedfromthetungstenhalogenlampisguidedintotheintegralballbythesourcefiber.Thelightcomeoutoftheintegralballirradiatethestandardboard,thereflectedlightofthestandardboardistreatedasthebackground.Thentaketargettissuesubstituteforthestandardboard,andscanthereflectedlightofit.Thereflectedlightspectraofthegastrictissuemucosallayerandthesubmucosalayerisguidedintothespectrometerbythecollectorfiber.ThespectrometerandthecomputerisconnectedbyUSB,spectrumcanbeprocessedusingcomputer.

　　36s

　　Firstofall,onlyaveragevisiblespectrumofthetargettissuecanbeacquired,itmeansthatthedocterscannotmakeoutthelocationofthecanceroustissueprecisely.

　　What’smore,thedeviceiseasytobeaffectedbychangesofopticalpathlengthinducedbydifferentset-upofproberandthevariationofhemoglobinconcentrationduetothepressurebetweenproberandtissue.

　　50s

　　Toavoidtheproblemsofthecommonlyusedtechniques,diffusereflectancevisiblespectroscopy,scientistsdoalotofresearchestofindoutanewwaytodiagnoseprecancer.

　　ThenewmethodisVisibleMicrospectroscopy.Thevisiblemicrospectroscopicmeasurementdeviceisaccomplishedonthebasisoffiberconfocalmicroscope,its3-dimagingprincipledevotetotheopticaltomographyabilityofthesystem.

　　Thevisiblemicrospectrumofcancerousandnormaltissuecanbeanalysedandcontrasted,soit’smoreusefulthanthenormalmethod.

　　45s

　　Thisisthestructureofthevisiblemicrospectroscopydevice.

　　Thefibercouplercanseparatethelightingbeamsfromthesignalbeam.Thetwolenscanfocusthelightonthetissue,

　　The3-Delectroniccontrolledplatformmovealongthedirectionofopticaxis,sothatthedevicecanacquirethevisiblemicrospectroscopysignalofthesampleindifferentdepth,preciselylocatetheboundaryofthecanceroussignalmeasuredfromdifferentpositioncanbestoredinthecomputerafteranalysedbythespectrometer.

　　31s

　　Thisisthespectrumchartofthenormaltissueandcanceroustissue,theyareanalyzedbythespectrometerbeforebeingtransmittedtothecomputer.Theupperchartisthevisiblespectrumofnormaltissue,itisregular.Contrastingtothis,inthenetherchart,thespectrumofthecancerousareashowsthatthestrengthofreflectedlightgrowsasthewavelengthgrows.

　　49s

　　篇二：

大学生学术交流演讲稿

　　演讲稿

　　各位同学，老师大家好！

我是。

很高兴能够有机会跟大家交流一下学习的经验。

　　前两天，我刚刚得知由我作为咱们大二的代表来跟大家交流学习经验的时候，我是又喜又惧

　　呀，为什么这么说那，喜是因为我的能力受到了老师及同学们的肯定，我的努力算是有了一

　　个小小的回报。

惧是因为我深知自己能力有限，才疏学浅，怕解决不了大家的问题，浪费了

　　大家的时间，反而误导了大家。

所以，为了消除我的恐惧心理，让我能够在接下来的时间里

　　能够自然的跟打击交流，请大家答应我一个请求，就是，你要是感觉我说的还算正确，你就

　　听一下，要是感觉我说的不对，请千万保留自己的意见。

咱们都是理科生，都习惯于理性思维，厌恶死板的说教，那我就用理性的思维跟大家分

　　析一下，咱们学习中经常会出现的问题。

分为三步，是什么？

为什么？

怎麽办？

首先是“是什