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1.
0 INTRODUCTIONFeaturerecognizingisplayinganincreasinglyim portantroleintheintegrationofCAD ,CAPPandCAM .IttakesinformationfromtherepresentationofapartandconvertsitintomachiningfeaturesthatareneededinCAPPandCAMsystemswhich generatethepart’smachining proce…  相似文献   

2.
1 INTRODUCTIONOncommon midpoint (CMP)andcommon shotpoint (CSP)gathers,seismictime distancecurvein (x,t)domaincanbeapproximatedashyperbo  相似文献   

3.
1 INTRODUCTIONThestandardchemicalmethodsforthedeter minationofsevenimpuritiesincobaltoxidein cludetwodifferentmethods (AASforCa ,AESforZn ,Ni,Fe ,Cu ,MnandPb) [1] .Onlyafewstudieshavebeenreportedforthedeterminationofimpuritiesinhigh puritycobaltoxide .Kujiraiand…  相似文献   

4.
PapersNO .1HPSElectronicBallastBasedonCIC -CPPFCTechniqueWANGWei SUQin GAOGuoan  1RicemutationafterflowninspaceSUNYeqing WEILijun LIXiaoleetal  7MacroscopiccumulativefatiguedamageofmaterialundernonsymmetricalcycleGAIBingzheng  12Geologicalcharactersandpetr…  相似文献   

5.
0 INTRODUCTIONForthe pastthirteenyears ,therehasbeenanimmenseinterestamongresearchersintheproblemsrelatedtomachinesimulationofhumanreading .Mostopticalcharacterrecognition (OCR)meth odsassumethatindividualcharacterscanbeisolated ,andsuchtechniques ,although…  相似文献   

6.
1 IntroductionManganeseperovskites ,suchasR1-yAyMnO3 (R =rare earthelement,A =divalentelement) ,areattractingconsiderabletheoreticandtechnologicalinterestsbyvirtueofthediscoveryofthecolossalmagnetoresistance(CMR) [1,2 ] .CMRiscausedbythecomplexnatureofin terplayof…  相似文献   

7.
Improvement of M-U-O and K-P-W proxy signature schemes   总被引:11,自引:0,他引:11  
0 INTRODUCTIONIn 1996 ,Mambo ,Usuda,andOkamoto[1,2 ] pro posedanewcategoryofsignatureschemecalledaproxysignature .Theproxysignatureschemeallowsadesignatedperson ,calledaproxysigner,tosignonbehalfofanorig inalsigner .Mambo[1] etalshow proxysignatureshouldhaveproperti…  相似文献   

8.
0 INTRODUCTIONInDescriptiveGeometry&MechanicalDrawing ,thechapterof″CombinationObject″isalwaysdifficultforbothteachersandstudents .Thekeyproblemisthatitishardtodevelopspaceimaginingabilitiesinthestudents′minds.Teachershavetoexplainthecontentswithmanyvis…  相似文献   

9.
1 INTRODUCTIONThehigh energyparticlephysicsexperimentsneeddetectors ,whichcanbeusedinhighradiationenvironment.Thesedetectorsrequir  相似文献   

10.
0 INTRODUCTIONAl Mnseriesalloysascommercialoneshavelonghis tory .Thefirstcommercial 3XXXalloywasdevelopedin190 6andthemainalloyingelementsofthisalloyare 1.2 5w (B) %Mnand 0 .13w (B) %Cu .In 192 9,30 0 4alloywith 1w (B) %Mgelementcameintoindustrialuse .Overpasttwenty years ,3XXXser…  相似文献   

11.
0 INTRODUCTIONItiswellknownthatthefatiguedamagephe nomenonisahighlynon linearprocess .Consequent ly ,thelineardamagerule (LDR) proposedbyPalm grenandMinercannotperfectlydescribeit[1,2 ] .Ithasthereforebecometheimportantsubjectformanyinvestigatorsimprovinguponi…  相似文献   

12.
0 INTRODUCTIONColloidchemistryisthesubjectsclosetoengi neeringprojectsandeasytobeintersectedwithothersubjects .Modernindustryandagricultureprovidecol loidchemistrywithagoodfield (forexamplepetro chemicalindustry ,painting ,printinganddying ,mineralseparatin…  相似文献   

13.
INTRODUCTIONLetNbethesetofpositiveintegers ,andletA ,B∈Nwithgcd (A ,B) =1andBsquarefree .Thediophan tineequationA2 x4 -By2 - 1,x ,y∈N ( 1)isakindofbasicandimportantquarticDiophantineequa tions[1] .In 1997,Cohn[2 ] andSunandYuan[3] provedrespectivelythatifA =1thentheonlypossibl…  相似文献   

14.
0 INTRODUCTIONTheproblemwasproposedin 2 0 0 0MathematicalContestinModeling (MCM )problemB .Basedonthestudyof 4colorproblem ,differentmodelsweredesigned .1 THEASSIGNMENTMODELEverytransmitter ,locatedatthecenterofeachhexagonwhoselengthissoveralargeplanar ,isassigne…  相似文献   

15.
0 INTRODUCTIONThefiniteelementmethod (FEM)hasbeenwidelyrecognizedforitsgeneralapplicability .TheFEMhasbe comeanefficientmethodforstructureanalysisandisalsothoughttobeoneoffuturedevelopmenttrendsforrein forcedconcrete (RC)design[1,2 ] .AlthoughRCobviouslydoesn…  相似文献   

16.
0 INTRODUCTIONTheintegratedCAD/CAPP/CAMsystemhasbeenwidelyusedinpracticewithsignificanteconomicgainsinconventionalmanufacturingfield.AlthoughafairlyhighlevelofautomationhasbeenachievedinElectricalDischargeMachining(EDM)equipment,thedesignofEDMproduction…  相似文献   

17.
1 INTRODUCTIONPress/sinter (P/M )isacommonlyusedtechnologyforfabricationofpowdermetallurgy31 6Lstainlesssteel.Yet,theas sinteredden sityisabout 90 %oftheoreticaldensitywithlowmechanicalproperties.SomeresearchersstudiedaddingelementslikeB ,P ,Si,Cu ,Al,etc .toformlo…  相似文献   

18.
CentralSouthUniversity (CSU)isoneofChina′skeyuniversities ,whichisaffiliatedwiththeMi nistryofEducation .“JournalofCentralSouthUniversityofTechnology (EnglishEdition)” (ISSN 10 0 5 9784 ,CODENJCSTFT ,Quarterly)issponsoredbyCSU .Prof.ChenGuoda ,AcademicianofChineseAca…  相似文献   

19.
CentralSouthUniversityofTechnology (CSUT)isoneofChina′skeyuniversities,whichisaffiliat edwiththeMinistryofEducation .“JournalofCentralSouthUniversityofTechnology (EnglishEdi tion)” (ISSN 10 0 5 9784,CODENJCSTFT)supportedbyCSUT ,willbeQuarterlyfromtheyearof2 0 0 0 .Pro…  相似文献   

20.
CentralSouthUniversity (CSU)isoneofChina′skeyuniversities ,whichisaffiliatedwiththeMin istryofEducation .“JournalofCentralSouthUniversityofTechnology (EnglishEdition)” (ISSN10 0 5 9784 ,CODENJCSTFT ,Quarterly)issupportedbyCSU .Prof.ChenGuoda ,AcademicianofChineseAca…  相似文献   

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