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《上海大学学报(英文版)》2000,(4)
1 Introduction Elasticmetalplastic (EMP) journalbearingisakindoforiginalbearing .Thebushiscomposedofthree layermaterials :purepolymerlayer ,polymere lasticlayerandsteelbase .Thefirsttwosuperstra tumsarecalledcompositelayer.Therigidityofcom positelayerisone te… 相似文献
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INTRODUCTIONCommunicativecompetence ,anotionprop osedbyHymes(1 972 )andothersasachallengetoChomsky s (1 965)conceptoflinguisticcom petence,hasnowbecomeaprimarytheoreticalconstructinsociolinguisticsandanumberofre lateddisciplines,especiallyforresearchingintothere… 相似文献
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现在 ,澳大利亚大约有 130 0个苗族人 ,(statis ticsinthisentryareestimatesmadebytheHmongcommu nity .The 1991censusconductedbytheAustralianBureauofStatisticsdidnotincludeanancestryquestion ,norwasHmongcodedasalanguage .ThustheAustralianHumongareconcealedamongstthestatisticsfor)是… 相似文献
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INTRODUCTIONInexcavation ,normalanalysisisnotgoodenoughtomeetengineeringneedsduetotheun certaintyofforcesappliedonbracestructures,soilcharacteristics,andsoilmodelused .Toguaranteethattheconstructionprocesscanbesmoothlyperformed ,measurementsinsituareusua… 相似文献
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INTRODUCTIONMotioncaptureplaysanimportantroleinthecreationofspecialeffectsinmanyfields.Asidefromuseinfilmsandanimations,motioncapturehascomprehensiveapplicationsintheanalysisofathleteperformance ,medicaldiagnostics,surveillance ,videoretrieval,etc.Conven… 相似文献
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INTRODUCTIONThegenerationofwasteswillbeincreasedwiththerapiddevelopmentoftechnologiesandindustrialpractices.Alargeamountofhazardousortoxicwastesisgeneratedintheprocessingin dustry(Nathanson ,1 986) .Althoughconvention alend of pipewastetreatmenthasprovedtobe… 相似文献
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INTRODUCTIONIncoldregions,soilexpansionresultedfromasoilfreezingprocessoftendeformsanddamagessomeconstructionfoundations.Onewaytostabilizethefoundationisuseoftwophaseclosedthermosyphoninthecoldregions.Duetoitsexcellentheattransfercharacteristics,thetwo… 相似文献
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1 Introduction ThespatialGreen’sfunctionsofmulti layeredmediaareusefulinanalysisofantennaandintegratedcircuitstructures.Theyareconstructedintwosteps.ThefirstistoderivethespectralGreen’sfunction .ThesecondistomakeinverseFouriertransformoftheGreen’sfunc t… 相似文献
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POLYMERIZATION OF METHYL METHACRYLATE WITH IRON-YTTERBIUM DINUCLEAR METALLOCENE CATALYST 总被引:1,自引:0,他引:1
INTRODUCTIONHeterodinuclearcomplexesareofgreatinter estforthestudyofsynergisticeffectsfoundinbimetalliccatalysis(Dombek ,1 985;JnLingetal.,1 993 ;Mccollumetal.,1 996) .Moreandmoresyntheticrouteshavebeenreportedinthelastdecade(Harteretal.,1 989;Scottetal.,1 993 ;Diamondetal.… 相似文献
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Influence of hydroxypropyl methylcellulose edible coating on fresh-keeping and storability of tomato
NTRODUCTIONDiscardednon degradableplasticfilmswide lyusedinfoodpackagingcause“whitepollu tion”totheenvironment.Inrecentyears,theus 相似文献
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1 Introduction Thetraditionalmethodtostudytheperformancesofinductionmotorsisbasedontheconceptofequivalentcircuit.Theparametersintheequivalentcircuitareusuallyobtainedbymagneticcircuitcomputation .Inre centyearsithasbecomepracticaltousefiniteelementmeth… 相似文献
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1 Introduction Monocrotophosandparathion methyl,whichbelongtoorganophosphorouspesticideswithstrongandex tensivepoison ,wereappliedwidelyforthepreventionandcontrolofplantdiseasesandeliminationofpests .Itistakenmoreattentiontostudythepotentialharmtopeoples… 相似文献
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1 Introduction Withthedevelopmentofthefrequencyconversiontechnology ,thefrequencyconvertersareextensivelyemployedinVVVFdrivesystems.Theyareusedtorealizesoftstartingoftheinductionmotor ,whichisoneoftheiradvantages.Nevertheless,inpractice ,thein verter moto… 相似文献
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INTRODUCTIONItiswellknownthatstresssingularitymayariseattheinterfaceedgeofbondeddissimilarmaterials.Duetotheintrinsicelectroelasticcou plingbehavior,thestresssingularitywillleadtothesingularbehavioroftheelectricdisplace ment.Dingetal.( 1 996)deducedthegener… 相似文献
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ShapeOptimalDesignofHydrodynamicBearingBasedonDynamicCharacteristicsChenYunfei(陈云飞)QianRuiming(钱瑞明)(DepartmentofMechanicalEng... 相似文献
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Amongthefourbasicskills ,writingistheweakpointofcollegestudentsinChina .Althoughinrecentyearsmuchmoreemphasisisputonthestudents’productiveskills ,duetothelimitedtime ,theyarenottakenveryseriouslyinpractice .IncurrentcollegeEng lishteachinginChina ,usuallyt… 相似文献
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1IntroductionAstandardMarkovchainisastochasticproceswithaconstanttransitionprobabilitymatrixP,wherePisaonesteptransitionprob... 相似文献
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Lin Ruisen Lu Liang 《上海大学学报(英文版)》1998,2(4):284-289
校澹睿洌酰欤酰恚骉X1IntroductionDesigningareliableandpracticablecontrolerforanonlinearsystemisnotsuficientlyaddressedbycon-ventionalco?.. 相似文献
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INTRODUCTIONTheactiveingredientintheformulatedprod uctSumithion ,fenitrothion [0 ,0 dimethyl0 (3 methyl-4 nitrophenol)phos phorothioate] ,isanorganophosphate (OP)insecticideusedinag ricultureforcropprotectionandcontrolofvectorborndiseasesofpublichealthandveteri… 相似文献