共查询到20条相似文献,搜索用时 15 毫秒
1.
IntroductionItisshownbyavailabletheoriesandexperiments[1]thaticosahedralsymmetryquasicrystalexistinginA1_Mnalloyis 3Dquasicrystal,ithasnotsymmetryinanydimensionsin 3Dspace ;Thesocalled 2Dquasicrystalsarethattheyhavetranslationalperiodicityinonespacedirecti… 相似文献
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IntroductionItiswell_knownthatneutraltypedifferentialequationarewidelyusedinbiology ,physicsandchemistry .Thestudyoftheneutralequationhasimportantsignificanceinboththeoryandapplication .Inthispaper,weconsiderperiodicsolutionofneutralequationas∑mi=0[aix(m-i… 相似文献
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IntroductionThebucklingeigenvalueproblemhasimportantsignificanceinthestabilityanalysisofengineeringstructure.Hencethenumericalcalculationfortheseproblemsisextremelymeaningfulincomputationalmechanics.ThepresentcomputationalmethodsfocusonFEM ,differencem… 相似文献
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云天铨 《应用数学和力学(英文版)》2001,(9)
1 ThePresentState ,theSignificanceandtheMethodsofOptionResearchAnoptionisarightofselection .Therearetwoselectionsforpurchasinganoption :i.e .,toexerciseitornottoexerciseit.Toabuyer,purchasinganoptionisusedforhedgingorformakingprofitsfromspeculation .Toasell… 相似文献
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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
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IntroductionAsamaterialundergoesirreversiblebehavior,itsmicrostructurewillchange .Particularly ,thesinglecrystalvolumefractionofapolycrystal,whichismathematicallyascalarfunctionontherotationgroupandiscalledaCODF (crystalorientationdistributionfunction) ,c… 相似文献
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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
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IntroductionTheMixinglayeriscommonlyencounteredinvariouschemicalprocesses .Itisthereforesignificanttostudythebehaviorsofcoherentstructuresinamixinglayerinordertopredictandcontroltheevolutionoftheflow ,thenimprovethemixingandchemicalreactionefficiency .S… 相似文献
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STUDY FOR THE BIFURCATION TOPOLOGICAL STRUCTURE AND THE GLOBAL COMPLICATED CHARACTER OF A KIND OF NONLINEAR FINANCE SYSTEM(Ⅱ) 总被引:1,自引:0,他引:1
IntroductionChaoticistheinherentrandomnessinthedefinitesystem .Thedefinitenessiscausedbythesysteminternalsbutnotbytheexternaldisturbance,whiletheinherentrandomnessistheirregularanddifficult_to_be_predictedbehaviorofthesystem .Whatismostattractiveofthec… 相似文献
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边宇虹 《应用数学和力学(英文版)》2000,21(5):591-596
IntroductionInengineeringtechnology,thebendingproblemofelasticthinplatehasimportantpracticalsignificance,andalotofresultshavebeenobtained.Becausetheproblemsofeachedgespointsupportedarecomplexer,therearefewresultsoftheproblems.Inthepaper[1],themethodofsup… 相似文献
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STUDY FOR THE BIFURCATION TOPOLOGICAL STRUCTURE AND THE GLOBAL COMPLICATED CHARACTER OF A KIND OF NONLINEAR FINANCE SYSTEM(Ⅰ) 总被引:1,自引:0,他引:1
IntroductionChaoticistheinherentrandomnessinthedefinitesystem .Thedefinitenessiscausedbythesysteminternalsbutnotbytheexternaldisturbance[1- 4],whiletheinherentrandomnessistheirregularanddifficult_to_be_predictedbehaviorofthesystem[5 ,6 ].Whatismostattractive… 相似文献
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IntroductionThenonlinearGalerkinmethodisamulti_levelschemetofindtheapproximatesolutionforthedissipativePDE (partialdifferentialequation) .Thismethodconsistsinsplittingtheunknownintotwo (ormore)terms ,whichbelongtothediscretespaceswithdifferentmeshsize .The… 相似文献
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IntroductionForalongtimetheeffectoftemperatureonthevibrationofplateshasdrawngreatattentioninthefieldofaeronauticsandastronautics,chemistry,nuclearpowerandmechanicalengineering.Incorrespondingtheoreticalanalysisthenonlineareffectshouldbetakenintoconsi… 相似文献
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IntroductionBecauseoftherequirementofc1continuity ,itisverydifficulttoconstructconformingKirchhoffplatebendingelements.Inordertoovercomethedifficulty ,manyapproacheshavebeenpresented .Intheseapproaches,therequirementofc1isreleasedonconditionoftheconvergen… 相似文献
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IntroductionTheproblemofdelaminationbucklingofcompositelaminateshasgeneratedsignificantresearchinterestsandhasbeenthesubjectofmanytheoreticalinvestigationsinthisdecade.Afiniteelementmodel[1]waspresentedtosolvethepost_bucklingproblemofcompositeplateswit… 相似文献
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A crystallographic model for the orientation dependence of low cyclic fatigue property of a nickel-base single crystal superalloy 总被引:3,自引:0,他引:3
IntroductionMuchworkhasbeencarriedouttoinvestigatetheinfluenceoforientationandstrainrateonthemechanicalpropertyofnickel_basesinglecrystalsuperalloys .Inparticular,theanomalousyieldingbehavior,tension/compressionasymmetryandorientationdependencehavebeen… 相似文献
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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
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Thestudyofconservationlawsofdynamicalsystemisasignificantaspectofmodernanalyticalmechanics.In1918,usingtheinvarianceofHamiltonactionundertheinfinitesimaltransformations,Noether[1]studiedconservationlawsofmechanicalsystemandpresentedthefamousNoether’stheor… 相似文献
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IntroductionTurbulentflowisanonlinearstochasticprocessandoneofitsbasiccharacteristicsislargereffectivetransportcapabilitythanthatoflaminarflow .Ingeneral,transportinfluidsisgradient,i.e.momentum ,energyaretransportedfromthehighervalueregiontothelowervalu… 相似文献
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IntroductionOneoftheprimaryproblemsingoetechnicalengineeringistoconstructasoilconstitutivemodelapplicabletogeneral 3_Dstressstates.Althoughmanytypesofconstitutivemodelshavebeenproposed ,fewcantakeproperaccountofthedirectionalchangeofstressvector (i.e .,ro… 相似文献