学术交流英语稿子

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1、Thefirstppt(0一0:20)Goodmorningeveryone!MynameisArvin.IcomefromtheuniversityofScienceandTechnologyofChina.TodayIwilldiscusshowtoextractthehdyrogenbyanewmethod.Thesecondppt(0:20—1:00)Atpresentourenvironmentissufferingfromseriouspollution,theblueskyhasdisappeared.WehavetofacethedreadedPM2.5al

2、mosteveryday.Why?Whyourenvironmentbecomesobad・Oneoftheimportantreasonsistheoveruseoffossilfuels,suchascoalandoil.Thesefossilfuelshaveagreatimpactonourenvironment.Thethirdppt(1:00一1:45)CuiTently,themoreseriousproblemisthatthefossilenergyisalsovanishingrapidly.Forthedevelopingcountrieslikech

3、ina,theannualdemandforenergyisverylarge.However,Coalreservescanbeonlyminedfor152yearsandwecanonlyuse40yearsofoil.Soitisemergencytofindaapporpriatealternative・Thefourthppt(1:45—2:35)Hydrogenisawonderfulsubstitute,becauseitisacleanenergyandalsohavehighcalorificvalue・Thereareavarietyofwaystop

4、roducehydrogen.Suchasbiological>waterelectrolysisandChemicalmethods.However,theremethodsaretooexpensiveorunfriendlytotheenvironment.Soweproposeanewmethodforproducinghydrogen,weobtainhydrogenbythereactionofaluminumwithwate匸Thefifthppt(2:35—3:20)Ifwewanttousethiswaytoextracthydrogen,weshould

5、solvetwochallengingproblem,ontheonehand,thereisanativethinoxidelayeronthealuminumsurfacewhichpreventwaterfromreactingwithaluminum.Ontheotherhand,Howtosavetheactivatedaluminumpowderisalsoabigproblem・Duetotheactivatedaluminumpowderiseasytobeoxidizedbyair.Thesixthppt(3:20—3:58)Inordertoactiva

6、tethealuminum,firstly,weaddsomeadditivesintothealuminumtomakealloys.Thenalloywasmillingwiththesalt.Saltcannotonlyactivatethealuminumbutalsoprotectitfromairoxidation.Withthesemethods,thealuminumcanreactwithwateratroomtemperaturetoreleasehydrogen.Theseventhppt(3:58—4:58)NextIwillintroducesom

7、eofthefactorsthataffectthehydrogenevolutionreaction.Thefirstfactoristemperature.Fromthisgraph,wecanseethattheconversionyieldenhancedsteadilywiththeincreaseofreactiontime・AndthehydrogengenerationrateincreasessharplywhenweincreasethetemperatureofwatecTheEighthpp