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1.
Simulation of Weld Depth in A-TIG Welding with Unified Arc-electrode model   总被引:1,自引:0,他引:1  
Itknownthatsmallamountsoffluxonthesurfaceofstainlesssteelcanincreasethedepthofweldpene trationinTIGweldingbyafactorofthree[1] .Thisprocessisreferredtoas”ATIG”orTIGweldingacti vatedbyflux .Therehavebeenthreepublishedphys icalmechanismsthatarepossiblecontri…  相似文献   

2.
Afurtherdiscussiononapplicationofladderopera-torinquantummechanicsZhengRenrong;ZhuShunquan;LinXinwei(DepartmentofPhysics,Sout...  相似文献   

3.
StructuresofTurbulentFlowsinNear┐walRegionZhangZhaoshun(张兆顺),XuChunxiao(许春晓)DepartmentofEngineeringMechanics,TsinghuaUniversi...  相似文献   

4.
Onepossiblemechanismforsignatureinversionofodd-oddnuclei¥ZhuShunquan;ZhengRenrong(DepartemntofPhysics,SouthwestChinaNormalUni...  相似文献   

5.
CoherentStructureVisualizationofRoundTurbulentJet*WangXilin(王希麟),GuHongxia(古红霞),LinWenyi(林文漪)DepartmentofEngineeringMechanics...  相似文献   

6.
AlignmentMechanismofLiquidCrystalMoleculesontheFluoratedPolyimideSurface*XuShouyi(徐寿颐),LiZhijun(李志军)DepartmentofChemistry,Tsi...  相似文献   

7.
I.IntroductionThepurposeoftheessay ,accordingtothewriter,is“todemonstratethatlogic,farfrombeingadry ,pedanticsubject,isaliving ,breathingthing,fullofbeauty,passion ,andtrauma .”ThestoryissetinalawschoolattheuniversityofMinnesota,U .S .A .Theprotagonist,aself -con…  相似文献   

8.
A UNIFIED MODEL FOR SOLAR FLARES   总被引:1,自引:1,他引:0  
Solarflaresareusuallyclassifiedintotwotypes,i.e.,compactandtwo-ribbonflares,whichwerethoughttorequirequitedifferentphysicalmechanisms[1].Duringtheeruptionoftwo-ribbonflares,denseplasmaloopsriseinthecoronaforover10hours,withtheirfoot-pointsseparating.…  相似文献   

9.
StabilityofNonlinearVibrationsofaDeployingFlexibleBeam*LiJunfeng(李俊峰),WangZhaolin(王照林)DepartmentofEngineeringMechanics,Tsingh...  相似文献   

10.
IntroductionSeveralmodelshavebeendevelopedtoestimatetheeffectiveelasticpropertiesofmaterialswithinclusions,e.g.,holesandmicrocracks.Thefamousmicromechanicalmodelsincludethecompositecylindermodel(CCM)byHashin[1],theselfconsistentmethodproposedindependently…  相似文献   

11.
IntroductionPhasetransitionaccompaniessignificantchangeinmechanicalpropertiesofpolymer.Alargedropofmodulusandenhancedmi cro Brownianmotiononheatingthroughglasstransitionormeltingtemperaturecanbeusedinthemoleculardesignofshapememorypolyurethane (SMPU ) .A…  相似文献   

12.
XAFS Study on Solid State Amorphization of Alloys by Mechanical Alloying   总被引:2,自引:0,他引:2  
IntroductionMechanicalalloying(MA)ofelementalpowdermixtureandmechanicalmilling (MM )ofinter metallicpowderhavebeensuccessfullyemployedinrecentyearsasamethodforsynthesizingamor phousandnano crystallinealloys[1~ 3 ] .XAFSmethodwassuccessfullyusedforunderstandi…  相似文献   

13.
产学研合作的机制分析AnalysisonMechanismofCooperationamongEnterprises,InstitutionsofHigherLearningandScientificResearchInstitutions¥//赵兰...  相似文献   

14.
IntroductionThesixspherical prismatic spherical(6SPS)parallelmech anismisgenerallyemployedina 6DOFsimulator (Fig .1) ,whichisthewell knownStewartplatform[1] .Itconsistsofamo bileplatform ,afixedbaseandsixextensiblerods.Sphericaljointsareusedtojointhesixrodswithth…  相似文献   

15.
ExperimentalInvestigationofTurbulentShearFlowbyPIV*XuHongqing(许宏庆),WuJia(吴嘉)DepartmentofEngineeringMechanics,TsinghuaUniversi...  相似文献   

16.
SynthesisandCroslinkingMechanismofaPolyacrylate/polyurethaneCompositeCoatingTangLiming(唐黎明),GuoWei(郭伟),LiuDeshan(刘德山),ZhouQix...  相似文献   

17.
IntroductionThemostcommonmethodofyarnproductionistheinsertionofcontinuous ,unidirectionaltwistintoaparallelarrayoffibersorfilaments.Thehightorsionalstressesgeneratedinsuchaprocesshaveaconsiderableeffectonthestabilityandmechanicalcharac teristicsoftheya…  相似文献   

18.
Introduction  Since 196 0 s ,withthedetailedstudyoftransformationalgen erativegrammar,Englishteachinghasgraduallyabandonedthemechanicpatterndrillsusedinaural oralmethodin 195 0 s,andfocusedondevelopingstudents communicativecompetence .MoreandmoreEnglishteacher…  相似文献   

19.
Forstudyingthedimensiontheoryofdynamicalsystem ,PesinintroducedCarath啨odorystructure(C structure)whichleadstothegeneralizationsofbothclassicaldimensionsandtopologicalpressures;HeconsideredtwotypicalC structureswhichconnectsrespectivelytheopencoveringand…  相似文献   

20.
IntroductionSincethe1940s,manyresearchershavestudiedtheblastingfractureofmetalcylindricalshellssubjecttotransientloadsinawiderangeofengineeringapplications.Theoreticalandexperimentalmodelshavebeendevelopedtodescribethefracturemechanismandruptureconditio…  相似文献   

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