资源描述：
《北京理工大学2000年攻读博士学位研究生入学考试试题》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。
1、北京理工大学2000年攻读博士学位研究生入学考试试题PassageOneAstronautJimVosshasenjoyedmanymemorablemomentsinhiscareer,includingthreespaceflightsandonespacewalk.Butherecallswithspecialfondnessadecidedlyearthboundexperienceinthesummerof1980,whenheparticipatedintheNASA-ASEESummerFacultyFellowshipProgramVoss,thenscienceteach
2、eratWestPointwasassignedtotheMarshallSpaceFlightCenter’spropulsionlabinAlabamatoanalyzewhyahydraulicfuelpumpsealonthespaceshuttlewasworkingsowellwhenprevioussealshadfailed,Itwasaseeminglytinyproblemamongthevastcomplexitiesofrunningthespaceprogram.YetitwasimportanttoNASAbecauseanycrackinthesealscou
3、ldhaveledtodestructiveresultsfortheastronautswhoreliedonthen.“IworkedabitwithNASAengineers,”saysVoss,“butIdiditmostlybyanalysisIusedahandheldcalculator,notacomputer,todoathermodynamicanalysis.’’Attheendofthesummer,heliketheotherNASA-ASEEfellowsworkingatMarshall,summarizedhisfindingsinaformalpresen
4、tationanddetailedpaperitwasavaluablemomentforVossbecausetheASEEprogramgavehimaddedunderstandingofNASAdeepenedhisdesiretoflyinspace,andintensifiedhisapplicationforastronautstatus.Itwasnotaneasyprocess,Vosswasactuallypassedoverwhenhefirstappliedfortheastronautprogramin1978.Overthenextnineyearshereap
5、pliedrepeatedly,andwasfinallyacceptedin1987,participatinginthreespacemissions.The50-year-oldArmyofficerwholivesinHouston,isnowintrainingforafour-monthmissionasacrewmemberontheinternationalSpaceStationstartinginJuly2000.VosssaystheNASA-ASEESummerFacultyFellowshipProgramiswonderfulforallinvolved.“It
6、bringsinpeoplefromtheacademicworldandgivesNASAaspecialpropertyforaparticularperiodofestablishesalinkwithourcollegesanduniversities,’’Vossexplains.“There’sanexchangeofinformationandanexchangeofperspectivesthatisveryimportant.Fortheacademicside.VosssaystheASEEprogramalso“bringsinstitutionsofhigherle
7、arningmoreinsightintotechnology,wegivethemanopportunitytoworkonreal-worldproblemsandtakeitbacktotheclassroom,’’71.Whywastheproblemof“ahydraulicfuelpumpsealonthespaceshuttle”important,accordingtothepassageauthor?[
