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1.
IntroductionItisshownbyavailabletheoriesandexperiments[1]thaticosahedralsymmetryquasicrystalexistinginA1_Mnalloyis 3Dquasicrystal,ithasnotsymmetryinanydimensionsin 3Dspace ;Thesocalled 2Dquasicrystalsarethattheyhavetranslationalperiodicityinonespacedirecti…  相似文献   

2.
IntroductionItiswell_knownthatneutraltypedifferentialequationarewidelyusedinbiology ,physicsandchemistry .Thestudyoftheneutralequationhasimportantsignificanceinboththeoryandapplication .Inthispaper,weconsiderperiodicsolutionofneutralequationas∑mi=0[aix(m-i…  相似文献   

3.
IntroductionThebucklingeigenvalueproblemhasimportantsignificanceinthestabilityanalysisofengineeringstructure.Hencethenumericalcalculationfortheseproblemsisextremelymeaningfulincomputationalmechanics.ThepresentcomputationalmethodsfocusonFEM ,differencem…  相似文献   

4.
1 ThePresentState ,theSignificanceandtheMethodsofOptionResearchAnoptionisarightofselection .Therearetwoselectionsforpurchasinganoption :i.e .,toexerciseitornottoexerciseit.Toabuyer,purchasinganoptionisusedforhedgingorformakingprofitsfromspeculation .Toasell…  相似文献   

5.
Research on the effect of particle of two-dimensional shear flow   总被引:2,自引:0,他引:2  
IntroductionTurbulentflowladenwithparticlesiscommoninbothnatureandindustry .Themixingdegreeofparticlesinthegas_solidflowissignificanttoindustrialapplications.Therecentresearchesindicatethatthecoherentstructuresexistinthemixinglayer.Croweetal.[1]evaluated…  相似文献   

6.
IntroductionAsamaterialundergoesirreversiblebehavior,itsmicrostructurewillchange .Particularly ,thesinglecrystalvolumefractionofapolycrystal,whichismathematicallyascalarfunctionontherotationgroupandiscalledaCODF (crystalorientationdistributionfunction) ,c…  相似文献   

7.
A FORM INVARIANCE OF CONSTRAINED BIRKHOFFIAN SYSTEM   总被引:2,自引:0,他引:2  
IntroductionThestudyofthedynamicsofBirkhoffiansystemisanactivebranchinthemodernclassicalmathematicsandamoderndevelopingdirectioninmathematicphysics ,andcanbeappliedtoquantummechanics,statisticalmechanics ,biologicphysics,mechanicsofspaceflightandsomefie…  相似文献   

8.
IntroductionTheMixinglayeriscommonlyencounteredinvariouschemicalprocesses .Itisthereforesignificanttostudythebehaviorsofcoherentstructuresinamixinglayerinordertopredictandcontroltheevolutionoftheflow ,thenimprovethemixingandchemicalreactionefficiency .S…  相似文献   

9.
IntroductionChaoticistheinherentrandomnessinthedefinitesystem .Thedefinitenessiscausedbythesysteminternalsbutnotbytheexternaldisturbance,whiletheinherentrandomnessistheirregularanddifficult_to_be_predictedbehaviorofthesystem .Whatismostattractiveofthec…  相似文献   

10.
IntroductionInengineeringtechnology,thebendingproblemofelasticthinplatehasimportantpracticalsignificance,andalotofresultshavebeenobtained.Becausetheproblemsofeachedgespointsupportedarecomplexer,therearefewresultsoftheproblems.Inthepaper[1],themethodofsup…  相似文献   

11.
IntroductionChaoticistheinherentrandomnessinthedefinitesystem .Thedefinitenessiscausedbythesysteminternalsbutnotbytheexternaldisturbance[1- 4],whiletheinherentrandomnessistheirregularanddifficult_to_be_predictedbehaviorofthesystem[5 ,6 ].Whatismostattractive…  相似文献   

12.
IntroductionThenonlinearGalerkinmethodisamulti_levelschemetofindtheapproximatesolutionforthedissipativePDE (partialdifferentialequation) .Thismethodconsistsinsplittingtheunknownintotwo (ormore)terms ,whichbelongtothediscretespaceswithdifferentmeshsize .The…  相似文献   

13.
IntroductionForalongtimetheeffectoftemperatureonthevibrationofplateshasdrawngreatattentioninthefieldofaeronauticsandastronautics,chemistry,nuclearpowerandmechanicalengineering.Incorrespondingtheoreticalanalysisthenonlineareffectshouldbetakenintoconsi…  相似文献   

14.
IntroductionBecauseoftherequirementofc1continuity ,itisverydifficulttoconstructconformingKirchhoffplatebendingelements.Inordertoovercomethedifficulty ,manyapproacheshavebeenpresented .Intheseapproaches,therequirementofc1isreleasedonconditionoftheconvergen…  相似文献   

15.
IntroductionTheproblemofdelaminationbucklingofcompositelaminateshasgeneratedsignificantresearchinterestsandhasbeenthesubjectofmanytheoreticalinvestigationsinthisdecade.Afiniteelementmodel[1]waspresentedtosolvethepost_bucklingproblemofcompositeplateswit…  相似文献   

16.
IntroductionMuchworkhasbeencarriedouttoinvestigatetheinfluenceoforientationandstrainrateonthemechanicalpropertyofnickel_basesinglecrystalsuperalloys .Inparticular,theanomalousyieldingbehavior,tension/compressionasymmetryandorientationdependencehavebeen…  相似文献   

17.
BIFURCATION ANALYSIS OF A MITOTIC MODEL OF FROG EGGS   总被引:1,自引:0,他引:1  
IntroductionWiththerapiddevelopmentofbiologysciences,cellsignaltransduction ,cellepoptosis,genomeandpost_genomicanalysishaveattractedincreasingattention[1- 6 ].Thecelldivisioncycleisthesequenceofeventsbywhichagrowingcellduplicatesallitscomponentsandthendiv…  相似文献   

18.
Thestudyofconservationlawsofdynamicalsystemisasignificantaspectofmodernanalyticalmechanics.In1918,usingtheinvarianceofHamiltonactionundertheinfinitesimaltransformations,Noether[1]studiedconservationlawsofmechanicalsystemandpresentedthefamousNoether’stheor…  相似文献   

19.
IntroductionTurbulentflowisanonlinearstochasticprocessandoneofitsbasiccharacteristicsislargereffectivetransportcapabilitythanthatoflaminarflow .Ingeneral,transportinfluidsisgradient,i.e.momentum ,energyaretransportedfromthehighervalueregiontothelowervalu…  相似文献   

20.
IntroductionOneoftheprimaryproblemsingoetechnicalengineeringistoconstructasoilconstitutivemodelapplicabletogeneral 3_Dstressstates.Althoughmanytypesofconstitutivemodelshavebeenproposed ,fewcantakeproperaccountofthedirectionalchangeofstressvector (i.e .,ro…  相似文献   

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