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1.
1 IntroductionFerroelectricsceramic/polymercompositeswithdif ferentconnectivitypatternshaveattractedrecentresearchinterestsbecauseoftheirpotentialuseashigh energystoragecapacitordielectricsandastransducersandsen sorsinsmartsystems[1 3 ] .Oneoftheattractive…  相似文献   

2.
1 IntroductionCalciumphosphatematerialsaresimilarincomposi tionsandstructuretobonemineralsandhavegoodbio compatibilityandosteoconducitivityasbonereplacementandaugmentations[1] .Atpresent,calciumphosphatearti ficialbonematerialsaremainlyceramicsandglasses ,…  相似文献   

3.
0 INTRODUCTIONWiththedevelopmentofthespacescienceandtechnology ,hybridceramicballbearingslubricatedwithsolidarewidelyemployed[1] .Solidlubricantsunlikeliquidlubricants ,cannotformacomplete ,con tinuousseparatingfilmbetweenmatingsurfaces ,andasaresultdirecto…  相似文献   

4.
0 IntroductionY TZP(Y2 O3 stabilizedZrO2 polycrystal)isakindofceramicmaterialswithexcellentstrengthandfracturetoughnessatroomtemperatureduetothestress inducedmartensitictransformationofthemetastabletetragonalphasetothestablemonoclinicphase[1,2 ].Ithasbeenre p…  相似文献   

5.
Recently ,ceramicmaterialshavebeengivenalotofattentionascandidatesforimplantmate rialssincetheypossesscertainhighlydesirablecharacteristicsforsomeclinicalapplicationsofhu manskeletonsubstitution ,heartvalvesrenewing ,dentalcrownrepairing .Ideally ,thephysi…  相似文献   

6.
TribologicalBehaviourofGCr15SteeltoSi_3N_4CeramicLubricatedbyBiphaseLiguidLubricantsSONGBaoyu;WANGLiqin;QIYulin(宋宝玉),(王黎钦),(齐毓...  相似文献   

7.
Synthetickaolinitehasadvantagesinapplicationsofsomefieldssuchaspapermakingandfineceramicfabri cationwhichrequirekaolinitewithhighwhitedegree .Thestructuresandnaturesofrawmaterials,andreactioncon ditionssuchaspH ,temperature ,themolarratioofSitoAlandaddit…  相似文献   

8.
Duringthelast10years,considerablework[1,2]hasbeenperformedandreviewedonpolysilanesynthesis.Thesepolymersappearveryinterestingasresistsformicrolithography,theprecursorsforceramicsorevenasconductingmaterials.TheyaregenerallysynthesizedbyWurtztypecouplingofs…  相似文献   

9.
Liquefactionofsaturatedbulksolid (e .g .brokenrocks ,sandysoilsandtailings,etc)isaphenomenonthatbulksolidshowssimilarliquidcharacterandlosescarryingcapacitycompletelyundertheactionofdynamicalload[1,2 ] .Vibrationcanpartlyorwhollycausebulksolidtobreak .Sincevib…  相似文献   

10.
0 INTRODUCTIONItisacommonsensethatmanyengineeringstruc turesmadeofheterogeneousaggregatematerialssuchasconcrete ,rocks ,ceramics ,andvariousparticle dispersedorfiberreinforcedcompositesexperienceanincreaseinbrittlenessandadecreaseinstrengthastheirsizeinc…  相似文献   

11.
0 INTRODUCTIONMonitoringofmachiningprocess ,suchasmoni toringchatterandtoolwearinmilling ,isclassicprob lembasedonsignalprocessing .Signals (suchasvi bration ,forceandacousticemission)collectedbythesensorsaretypicallyaffectedbytheprocessdefects ,processworki…  相似文献   

12.
0 INTRODUCTIONItiswellknownthatheterogeneousquasi brittleag gregatematerialssuchasconcrete ,rocks ,ceramics ,andvariousparticle dispersedorfiberreinforcedcompositesexperienceanincreaseinfracturetoughnessastheirsizeincreases .Anessentialcharacteristicofquas…  相似文献   

13.
β cyclodextrin ( β CD)hasmanychiralcar bonatomsandspecialcavitystructure ,itcannotonlybeusedtoseparatearomaticcompounds,butalsoenantiomers.Thetremendouspotentialofcy clodextrins,ortheirderivativesforenantiomersseparationwasdescribed[1,2 ] .Becauseofhighmelting…  相似文献   

14.
0 INTRODUCTIONAsitbecomesincreasinglyclearthatthoseconve nientenergysources ,suchasoilandgas,cannotsup porttheworldforever .Manhasbeguntoturntofindthealternatives[1] .Withthegrowingconcernsonthegreenhouseeffectin 1990s ,hydrogenhasbeenrecog nizedasanimportantf…  相似文献   

15.
Thetheoreticalstudyofalargescalesystemisaveryimportantprobleminsystemsscience.Recently,accordingtoQianXuesen’sandJ.S.Dyer’sthoughts(seerefs.[1,2])oflargescalesystems,wepresentanewoptimalexperimentaltheory(seerefs.[3—11])whichcombinesmathematicalmodelswithexper…  相似文献   

16.
TheoreticalDiscussioninTeachingtheOutlineofDengXiaoPingTheory WangXinao(1)……………………TalkSomethingAboutDengXiao - ping’sThoughtofAccom  相似文献   

17.
Qualityandefficientofsoilandotherroad buildingmaterialscompactiondependsonnumberoffactors (typeandintensityofinfluence ,propertiesofcompactionmate rials ,technologicalschemeandconditionofcompaction) .Butthemainandmostimportantfactorisinteractionbe tweensur…  相似文献   

18.
0 INTRODUCTIONRobotsoccerisanewkindofinternationalhigh techcompetitiondevelopedrapidlyinrecentyears .Asamark ingandchallengingsubjectofAIandRobotics ,itnotonlyprovidesanidealtest bedfortheresearchofhightech nologiessuchasmulti agentcooperation ,butalsopres…  相似文献   

19.
1 INTRODUCTIONTheestimationofconvergencevelocityand parameterizationof geneticalgorithms(GA)aretwoimportanttheoreticproblems,buttherearefewstricttheoreticresults[1] .T .B ck[2 ,3] obtainedtheestimationofconver gencevelocityofsimplifiedGAbyapplyingor derstatisti…  相似文献   

20.
0 INTRODUCTIONTheoperationofthetrafficmanagementcenterofexpresshighwayinfrastructuresisessentiallybasedontheavailabilityofinformation providedbytheavailabilityofinformationprovidedbytheimplement eddevicessuchasloopdetectors ,communicationde vices,hardwa…  相似文献   

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