简介：Alinearstabilityanalysisisperformedforaplumeflowinsideacylinderofaspectratio1.TheconfigurationisidenticaltothatusedbyLopezandMarques(2013)fortheirdirectnumericalsimulationstudy.Itisfoundthatthefirstbifurcation,whichleadstoaperiodicaxisymmetricflowstate,isaccuratelypredictedbylinearanalysis:boththecriticalRayleighnumberandtheglobalfrequencyareconsistentwiththereportedDNSresults.Itisfurthershownthatpressurefeedbackdrivestheglobalmode,ratherthanabsoluteinstability.

简介：Althoughthebearingcapacityofplateanchorsinclayhasbeenstudiedextensively,theresultsconsideringtheeffectsofoffshorecyclicloadingarerelativelyrare.Inthepresentstudy,1gmodeltestsarecarriedouttoinvestigatetheeffectofcyclicloadingonthebearingcapacityofplateanchorsinclay.Theultimatepulloutcapacityofplateanchorsinclaydecreasesastheaccumulatedplasticshearstraingrowsduetothestrain-softeningofclayundercyclicloading.Theload-displacementcurvesofthesetestsarepresentedandtheeffectsofoverburdenstressandcyclicloadingamplitudeonthestrain-softeningbehaviorarediscussed.

简介：Pipelinesarethecriticallinkbetweenmajoroffshoreoilandgasdevelopmentsandthemainland.Anyinadequateon-bottomstabilitydesigncouldresultindisruptionandfailure,havingadevastatingimpactontheeconomyandenvironment.Predictingthestabilitybehaviorofoffshorepipelinesinhurricanesisthereforevitaltotheassessmentofbothnewdesignandexistingassets.TheGulfofMexicohasaverydensenetworkofpipelinesystemsconstructedontheseabed.Duringthelasttwodecades,theGulfofMexicohasexperiencedaseriesofstronghurricanes,whichhavedestroyed,disruptedanddestabilizedmanypipelines.Thispaperfirstreviewssomeoftheseengineeringcases.Followingthat,threecasestudiesareretrospectivelysimulatedusinganin-housedevelopedprogram.ThestudyutilizestheoffshorepipelineandhurricanedetailstoconductaDynamicLateralStabilityanalysis,withtheresultsprovidingevidenceastotheaccuracyofthemodelingtechniquesdeveloped.

简介：Thesynthesisofnontoxicstablegoldnanoparticlesisimportantformedicalapplications.AnaqueousextractoftheplantStachyslavandulifoliaVahlwasusedtosynthesizegoldnanoparticles.ThisgreenmethodinvolvedtheS.lavandulifoliaVahlextractactingasareducingandstabilizingagent.Thenanoparticleswerecharacterizedbytransmissionelectronmicroscopy,dynamiclightscatteringanalysisandUV-visabsorptionandFouriertransform-infraredspectroscopies.Stabilityunderphysiologicalconditionsisimportantformedicalapplications.Thestabilityofthenanoparticleswascomparedwiththatofconventionalcitrate-cappednanoparticles,underbothsyntheticandphysiologicalconditions.ThenanoparticlessynthesizedfromtheS.lavandulifoliaVahlextractwerestableunderphysiologicalconditions,incontrastwithconventionalcitrate-cappednanoparticles.

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简介：Hyperbranchedpolyethylenimine（PEI）-functionalizedmesoporoussilica（MCM@PEI）wassynthesizedandusedtoproducepoly（vinylalcohol）（PVA）nanocomposites.Themodifiednanofillerwascharacterizedwithinfraredspectroscopy,thermogravimetricanalysis,X-raydiffraction,scanningelectronmicroscopy,transmissionelectronmicroscopy,andN2adsorption.Whencomparedwithpuremesoporoussilica（MCM）,theMCM@PEInanoparticlesexhibitedbetterdispersioninthePVAmatrix.TheeffectsofMCM@PEIonthethermalandflamepropertiesofPVAnanocompositeswerealsostudied.Improvementinthethermalpropertieswasconfirmedbyenhancedthermalstabilityandcharyield.IncorporationofMCM@PEIinPVAledtoasignificantdropintheheatreleaserateandthetotalheatrelease.