简介：ＯＮＭＥＣＨＡＮＩＣＡＬＰＲＯＰＥＲＴＹＯＦＣＯＮＳＴＲＡＩＮＴＷｅｉＹａｎｇ（韦杨）；ＬｉａｎｇＬｉｆｕ（梁立孚）；ＬｉａｎｇＺｈｏｎｇｗｅｉ（梁忠伟）（ＲｅｃｅｉｖｅｄＳｅｐ．６，１９９４；ＣｏｍｍｕｎｉｃａｔｅｄｂｙＣｈｉｅｎＷｅｉｚａｎｇ）Ａ...

简介：Thediscretizationsizeislimitedbythesamplingtheorem,andthelimitisonehalfofthewavelengthofthehighestfrequencyoftheproblem.However,onehalfofthewavelengthisanidealvalue.Ingeneral,thediscretizationsizethatcanensuretheaccuracyofthesimulationismuchsmallerthanthisvalueinthetraditionalfiniteelementmethod.Thepossiblereasonofthisphenomenonisanalyzedinthispaper,andanefficientmethodisgiventoimprovethesimulationaccuracy.

简介：Theturtleshellisanamazingstructureoptimizedthroughthelong-termevolutionbynature.Thispaperreportstheexperimentalstudyonthemechanicalpropertyatdifferentlevelsandlocations,andthemicrostructureoftheshellfromTrachemysscripta(Red-earturtle)livinginSouthChina.

简介：Thefieldofmechanicsofbiologicalandbio-inspiredmaterialsunderwentanexcitingdevelopmentoverthepastseveralyears,whichmadeitstandatthecuttingedgeofbothengineeringmechanicsandbiomechanics.Asanintriguinginterdisciplinaryresearchfield,itaimsatelucidatingthefundamentalprinciplesinnature'sdesignofstrong,multi-functionalandsmartMaterialsbyfocusingontheassembly,deformation,stabilityandfailureofthematerials.Theseprinciplesshouldhavewideapplicationsinnotonlymaterialsciencesandmechanicalengineeringbutalsobiomedicalengineering.Forinstance,theknowledgeinMechanicalprinciplesofbiologicalmaterialsisveryhelpfulforaddressingsomemajorchallengesinmaterialsciencesandengineering.Theyalsohavethepotentialtoprovidequantitativeunderstandingabouthowforcesanddeformationaffecthumanbeing'shealth,diseasesandtreatmentattissue,cellularandmolecularlevels.

简介：Biologicalmaterialssuchasbone,tooth,andnacreareload-bearingnanocompositescomposedofmineralandprotein.Sincethemineralcrystalsoftenhaveslendergeometry,thenanocompositesaresusceptibletobuckleunderthecompressiveload.Inthispaper,weanalyzethelocalbucklingbehaviorsofthenanocompositestructureofthebiologicalmaterialsusingabeam-springmodelbywhichwecanconsiderplentyofmineralcrystalsandtheirinteractioninouranalysiscomparedwithexistingstudies.Weshowthatthereisatransitionofthebucklingbehaviorsfromalocalbucklingmodetoaglobalonewhenwecontinuouslyincreasetheaspectratioofmineral,leadingtoanincreaseofthebucklingstrengthwhichlevelsofftothestrengthofthecompositesreinforcedwithcontinuouscrystals.Wefindthatthecontactconditionatthemineraltipshasastrikingeffectonthelocalbucklingmodeatsmallaspectratio,buttheeffectdiminisheswhentheaspectratioislarge.Ouranalysesalsoshowthatthestaggeredarrangementofmineralplaysacentralroleinthestabilityofthebiologicalnanocomposites.

简介：ThePainlev'eintegrabilityandexactsolutionstoacouplednonlinearSchr¨odinger(CNLS)equationappliedinatmosphericdynamicsarediscussed.SomeparametricrestrictionsoftheCNLSequationaregiventopassthePainlev'etest.TwentyperiodiccnoidalwavesolutionsareobtainedbyapplyingtherationalexpansionsoffundamentalJacobiellipticfunctions.TheexactsolutionstotheCNLSequationareusedtoexplainthegenerationandpropagationofatmosphericgravitywaves.

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