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1.
and Magnetic Properties in Fe_(25)Ni_(75) on Ball Milling TimeTX1IntroductionIthasbeenrecentlyreportedthatnanocrystalinemateri...  相似文献   

2.
INTRODUCTIONTheproposedtwo stepcontrolgradingmethodshowninFig .1arrangesallkindsoffunctionsinorderofimportanceandthendefinestheirdegrees.Fig .1 Two stepcontrolgradingmethodprocedureFig.1showsthatthe“0 -1gradingmethod”firstgradesthefunctionsandthenuse“signex …  相似文献   

3.
1 Introduction Thestressintensityfactor(SIF)ofthesemiellipticalsurfacecrackneedstobecalculatedforevaluatingthestrengthofmetalcomponentsbecausemanyflawsoccuronthecomponentsurfaceduetothenanufactureandtransportprocedure.Uptonow,solvingthreedimensionalcra…  相似文献   

4.
1 Introduction Specificationdescribesthebehaviorofthesystemintermsofresults,whereasanimplementationdefinesbehaviorintermsofprocedure.Thisdistinctiongivesrisetotheinformalnotionofdescribingspecificationas“what”asopposedtodescribingimplementationas“ho…  相似文献   

5.
OnL∞StabilityandConvergenceofFictitiousDomainMethodfortheNumericalSolutiontoParabolicDiferentialEquationwithDerivativeBoundar...  相似文献   

6.
CONSTRUCTION COST INTEGRATED CONTROL BASED ON COMPUTER SIMULATION   总被引:1,自引:0,他引:1  
INTRODUCTIONConstructioncostcontrolisimportantactivityforefficientmanagementofaconstructionproject.Acostcontrolsystemmustbedesignedtocontrolwelltheconstruction (WangShou qing,1 996) .Thissystemshouldbeprovidedwiththefunctiontolettheprojectmanagerknowthecur…  相似文献   

7.
INTRODUCTIONThereisgrowingconcernforcorrosiondam ageinreinforcedconcrete (RC)structureswithseveraldecades’service.Thereinforcementcor rosionofRCconstructionsprobablyisthemostsignificantproblemandoutweighsotherformsofdeterioration .StudiesbyPeattieetal.( 1 9…  相似文献   

8.
Physicalpropertiesofacrystalarerelatedtoitsconstituentchemicalbonds,whichshowtheinteractionofalconstituentatoms.Chemicalbond...  相似文献   

9.
1 Introduction Generallyspeaking ,productconcurrentdesignislo calizedwithinenterprises .Withtheincessantdevel opmentofInternetandweb basedapplicationtech niques,however ,itisurgentlyneededtocopewiththeproblemsofproductconcurrentandcollaborativedesignindisc…  相似文献   

10.
Notations Co—initialconcentrationofMnSO+4 ,mol/L Cx—concentrationofPhCHOattime ,mol/L Ct—concentrationofMnSO+4 attime ,mol/L Cy—concentrationofMnO2 ,mol/L ka—rateconstantofoxidation ,mol/(L·min) kb—rateconstantofdisproportionation ,mol/(L·min)  ηθ—ratioofconversio…  相似文献   

11.
1 Introduction Itisknownthattheprotectionefficiencyofzincispartiallyasaresultofformingaprotectivefilmonabasemetal,suchassteel.Althoughpurezinccoatingprovidessomedegreeofprotectionforthesubstrate ,zincisconsumedrapidlyinaseverecorrosionenvi ronment.Conse…  相似文献   

12.
1 Introduction Becauseofthecombinationofanumberoffavorableproperties,suchashighhardness,highcarriermobilityandbreakdownvoltage,largebandgap ,lowdielectricconstant,andtransparencytovisiblelight,IRlightandmicrowaves,etc.[1] ,diamondfilmhasbeenconsider ablyprom…  相似文献   

13.
INTRODUCTIONInthispaper,weconsiderthefollowingcon vexquadraticprogrammingminf(x) =12 xTQx cTxs.t.Ax≤b ,x≥ 0( 1 )wherec ,xaren vectors,bisanm vector,AisamatrixandQisasymmetricpositivesemi definitem×nmatrix .Theformof( 1 )doesnotlosegenerality ,becauseanypequalitycon st…  相似文献   

14.
g on a 150 M ̄3 Turbo Oxygen Gas ExpanderTX1IntroductionItisoneoftheimportantreasonsforusingactivemagneticbearingtoreplacetheae?..  相似文献   

15.
INTRODUCTIONItisimportanttoforecastandcalculatetheroleofconsolidationinstrengtheningsoftsoilground .Forconvenientuseinengineering ,themodelofconsolidationwasreducedtoaone di mensionalprobleminspatialdomain .SinceTerzaghiestablishedone dimensionallinearco…  相似文献   

16.
1 Introduction Thesputteringtechniquewellsuitsthegrowthofcompoundsandalloys ,whoseelementalconstituentshavesignificantlydifferentmelting pointsandvaporpressures.AconsiderableamountofworksaboutrfsputterdepositionofbinaryⅢ Ⅴcompoundfilmshasbeenpublished[1~…  相似文献   

17.
INTRODUCTIONTheequilibriumbed concentration ,asthebedboundaryconditionforsolvingthedifferen tialequationofsuspendedloadisvitaltomath ematicalmodelingofsedimenttransport.Be causeofdifficultiesinmeasurementsofthebedconcentrationinthefieldandintheexperimen…  相似文献   

18.
INTRODUCTIONOn lineseparationandpreconcentrationhavereceivedconsiderableattentioninflowinjectionanalysiscoupledwithatomicabsorptionspec trometryduringrecentyearsandiswidelyap pliedforselectivityandsensitivityenhancement(Fang ,1 995 ) .Automationofthesamplep…  相似文献   

19.
1 .DistributedLearningModeDistributedlearningderivesfromtheconceptofdistributedresource .Itallowsleader,student,andcontenttobedispersedindifferent,non centralpositions .Thus,learningandstudyingcanhappenindependentlyfromtimeandspace .Theconceptofdistributedl…  相似文献   

20.
HistoricalReviewOnThePsychologicalApproachesUnderlyingMotivationalRe search .Wewillconsiderthreegeneralapproachestomotivation :behaviourism ,cognitiveandsocialconstructivist .1.BehaviouristApproach :BehaviouristslikeSkinnerorWastonwouldstresstheroleofrewar…  相似文献   

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