共查询到20条相似文献,搜索用时 15 毫秒
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TomwasfollowingUncleSamtotherainforestinBrazil’sAmazonregion①.AshewalkeddeepinsidetherainforestwithUncleSam ,hesawthetreetopstoucheachother,creatingashaded②forestinside .Allofasudden ,Tomheardtheraindropspatting③onthetreeleaves.Tomputonhisraincoatassoona… 相似文献
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《中山大学学报论丛》1996,(3)
OnColegeEnglishClasroomResearchLinLiechengItisadecadesincethecaryingoutoftheCOLLEGEENGLISHTEACHINGSYLLABUS.Wearenowfacedwith... 相似文献
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陈鲁华 《兰州教育学院学报》2002,(2)
ThomasNashe ( 1 5 67- 1 60 1 ?) ,sonofaclergymanandasizaratCambridgeUniversity,wastheyoungestoftheso -called“UniversityWits” ,agroupofimmediatepre -ShakespeareanplaywrightsandwritersofeitherromancesorrealisticfictionsandprosesfromtheuniversitiesofOxfordandCam bridg… 相似文献
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Matteo Pastorino 《上海大学学报(英文版)》1998,2(1):1-14
RecentAdvancesinShort┐RangeMicrowaveImaginginEuropeMateoPastorino(DepartmentofBiophysicalandElectronicEngineering,Universityo... 相似文献
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OBSTACLE DETECTION BY ALV USING TWO 2D LASER RANGE FINDERS 总被引:6,自引:0,他引:6
INTRODUCTIONObstacleavoidanceisanessentialtaskoftheALV .Toachievethis,aquickandreliablede tectionofobstaclesisveryimportant.Severalclassesofactivesensorscanbeusedforthispur pose .Alaserrangefinder (LRF)cansuitablybeusedtodetectobstaclesaheadoftheALV .3DLRFs… 相似文献
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INTRODUCTIONSeriesbatterystringsarewidelyutilizedinmanyapplicationssuchastelecommunicationpowersupplies,electricvehicles,uninterruptedpowersuppliesandphotovoltaicsystems,etc .Thelifetimeofabatteryisoneofthemajorfac torsthatlimittherealizationofaneconomi… 相似文献
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INTRODUCTIONForn≥ 2 ,m≥ 2 ,letSn - 1 andSm - 1 betheunitsphereinRnandRmrepectively ,equippedwiththenormalizedlebesguemeasure .LetΩbeafunctiondefinedonSn - 1 ×Sm - 1 satisfyingΩ∈L1 (Sn - 1 ×Sm - 1 )and∫sn-1 Ω(u ,v)du =0 ,( v ∈Sm- 1 )∫sm-1 Ω(u ,v)du=0 ,( v ∈Sn- 1 ) ( 1 )ThecorrespondingMarcinkie… 相似文献
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PS加固土质石质文物的稳定性和强度问题李最雄TheStrengthandStabilityontheUseofPStoStrengthenFragileStoneRelicsandAncientEarthenArchitectureLiZuiXion... 相似文献
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Aim :TheJournalofZhejiangUniversity(Science)iseditedbyaninternationalboardofdistinguishedChineseandforeignscientists,andisaimedtopresentthelatestdevel opmentsandachievementsinscientificresearchinChinaandoverseastotheworld sscientificcircles,speciallytost… 相似文献
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Aim:TheJournalofZhejiangUniversity(Science)iseditedbyaninternationalboardofdistinguishedChineseandforeignscientists,andisaimedtopresentthelatestdevelopmentsandachievementsinscientificresearchinChinaandoverseastotheworldsscientificcircles,speciallytosti… 相似文献
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Aim :TheJournalofZhejiangUniversity(Science)iseditedbyaninternationalboardofdistinguishedChineseandforeignscientists,andisaimedtopresentthelatestdevel opmentsandachievementsinscientificresearchinChinaandoverseastotheworld sscientificcircles,speciallytost… 相似文献
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1 .IntroductionGPSS(GeneralPurposeSimulationSystem)isaconvenientandapplicablesimulationlanguage ,whichisextensivelyusedindiscrete -eventsimulationstudies .Productionsystemsorproductionlinesareitsmajorapplicationareas .UndertherequestsfromtheTianjinDieselEn… 相似文献
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am ,is,are的用法 ,是学生学习的难点 ,也是重点。学好它们的用法 ,对于以后的学习有很大的帮助。因此 ,必须掌握其用法。在教学中 ,我编了一则顺口溜 ,供大家学习参考 :am ,is,are用法不复杂第二人称are做主人称复数全用are三单is在 ,一单am加分清人称你我他 ,走到哪儿也不怕。注 :三单即第三人称单数用is,第一人称单数实际是指I(我 )用am ;例 :1、Hername WangLi.(填is。因为Hername(他的名字 )不是复数 ,也不是I,更不是 you ,所以必然是第三人称单数 ,故用is)。2、Lucy… 相似文献
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嵇仲韶 《宁波大学学报(教育科学版)》2000,22(3)
sinnA+sinnB+sinnC的下界就一般△ABC来说是0,而本文主要就非钝角三角形情况,来探讨幻sinnA+sinnB+sinnC的最小值问题. 当n=1或2的时候,易证所求的下界为2,本文着重于n≥3的情况. 设y=sinnx,则y’=nsinn-1xcosx,再求导得: y”= n(n-1)sinn-2 xcosx-nsinnx =nsinn-2x[(n-1)cos2x-sin2x]. 当 tgx≤ y”≥0,此时y=sinnx是凸函数,应用有关凸函数性质可知:(1)当arctg … 相似文献
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由一道高考题谈“prefer”的用法□永登县五中陈国忠’94年英语高考有一道选择题:Ratherthanon一一acrowdedbus,healwaysprefers一一bicycle.A.ride;rideB.riding;rideC.ride;t... 相似文献
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INTRODUCTIONSuppose {X ,Xn;n≥ 1 }isasequencei.i.d .r.v .LetSn=∑ni=1XiandV2 n=∑ni=1X2 i.R啨v啨sz( 1 990 )studiedthelimitbehaviorofthese quenceLn =max0≤j<n max1≤k<n-jk- 1 2 (Sj k -Sj) ( 1 )andprovedthatifP(X =± 1 ) =12 then1 ≤liminfn→∞Ln( 2logn) 1 2 ≤limsupn→∞Ln( 2logn) 1 2 =K <∞ a.s.,( 2 )wheretheexactv… 相似文献
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SUN Lin zhi SUN Ping WANG Cun min QIN Xin jie 《上海大学学报(英文版)》1999,3(4):308-312
1 Introduction Millimetersizemicromachinesbasedonmodernprecisionmachininghavepotentialapplicationinindustry.Somenarrowspacesorsmallareasneedthesemicromachinestoinspectandrepairdefects.Researchershaveworkedonfabricationofvariedvehicleswithwheels,mob… 相似文献
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ZHOU Xi zhao 《上海大学学报(英文版)》1999,3(4)
1 Introduction StandardizedUE(User’sEquilibrium)assignmentisaroutechoiceproblemfromorigintodestination(OD).Inequilibrium,throughthechosenroutesconnectedwithODonewillspendthesametraveltime,nomorethanthatthroughotherrouteswhichwerenotchosen. Therear… 相似文献
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INTRODUCTIONIntheManifestooftheCommunistParty,MarxandEnglesdeclared :“Inplaceoftheoldbourgeoissociety ,withitsclassesandclassan tagonisms,weshallhaveanassociation ,inwhichthefreedevelopmentofeachisthecondi tionforthefreedevelopmentofall”(Marx&En gels ,1 984 ) .… 相似文献