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1.
TomwasfollowingUncleSamtotherainforestinBrazil’sAmazonregion①.AshewalkeddeepinsidetherainforestwithUncleSam ,hesawthetreetopstoucheachother,creatingashaded②forestinside .Allofasudden ,Tomheardtheraindropspatting③onthetreeleaves.Tomputonhisraincoatassoona…  相似文献   

2.
QUESTIONSHEETSDirections:Inthispapertherearesevenpartswith80questions.Answereachquestionaccordingtotherequirementineachpart.W...  相似文献   

3.
OnColegeEnglishClasroomResearchLinLiechengItisadecadesincethecaryingoutoftheCOLLEGEENGLISHTEACHINGSYLLABUS.Wearenowfacedwith...  相似文献   

4.
ThomasNashe ( 1 5 67- 1 60 1 ?) ,sonofaclergymanandasizaratCambridgeUniversity,wastheyoungestoftheso -called“UniversityWits” ,agroupofimmediatepre -ShakespeareanplaywrightsandwritersofeitherromancesorrealisticfictionsandprosesfromtheuniversitiesofOxfordandCam bridg…  相似文献   

5.
RecentAdvancesinShort┐RangeMicrowaveImaginginEuropeMateoPastorino(DepartmentofBiophysicalandElectronicEngineering,Universityo...  相似文献   

6.
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   

7.
INTRODUCTIONSeriesbatterystringsarewidelyutilizedinmanyapplicationssuchastelecommunicationpowersupplies,electricvehicles,uninterruptedpowersuppliesandphotovoltaicsystems,etc .Thelifetimeofabatteryisoneofthemajorfac torsthatlimittherealizationofaneconomi…  相似文献   

8.
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   

9.
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   

10.
Aim :TheJournalofZhejiangUniversity(Science)iseditedbyaninternationalboardofdistinguishedChineseandforeignscientists,andisaimedtopresentthelatestdevel opmentsandachievementsinscientificresearchinChinaandoverseastotheworld sscientificcircles,speciallytost…  相似文献   

11.
Aim:TheJournalofZhejiangUniversity(Science)iseditedbyaninternationalboardofdistinguishedChineseandforeignscientists,andisaimedtopresentthelatestdevelopmentsandachievementsinscientificresearchinChinaandoverseastotheworldsscientificcircles,speciallytosti…  相似文献   

12.
Aim :TheJournalofZhejiangUniversity(Science)iseditedbyaninternationalboardofdistinguishedChineseandforeignscientists,andisaimedtopresentthelatestdevel opmentsandachievementsinscientificresearchinChinaandoverseastotheworld sscientificcircles,speciallytost…  相似文献   

13.
1 .IntroductionGPSS(GeneralPurposeSimulationSystem)isaconvenientandapplicablesimulationlanguage ,whichisextensivelyusedindiscrete -eventsimulationstudies .Productionsystemsorproductionlinesareitsmajorapplicationareas .UndertherequestsfromtheTianjinDieselEn…  相似文献   

14.
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   

15.
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   

16.
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   

17.
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   

18.
1 Introduction Millimetersizemicromachinesbasedonmodernprecisionmachininghavepotentialapplicationinindustry.Somenarrowspacesorsmallareasneedthesemicromachinestoinspectandrepairdefects.Researchershaveworkedonfabricationofvariedvehicleswithwheels,mob…  相似文献   

19.
1 Introduction StandardizedUE(User’sEquilibrium)assignmentisaroutechoiceproblemfromorigintodestination(OD).Inequilibrium,throughthechosenroutesconnectedwithODonewillspendthesametraveltime,nomorethanthatthroughotherrouteswhichwerenotchosen. Therear…  相似文献   

20.
INTRODUCTIONIntheManifestooftheCommunistParty,MarxandEnglesdeclared :“Inplaceoftheoldbourgeoissociety ,withitsclassesandclassan tagonisms,weshallhaveanassociation ,inwhichthefreedevelopmentofeachisthecondi tionforthefreedevelopmentofall”(Marx&En gels ,1 984 ) .…  相似文献   

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