简介：Manybiologicalmaterials,suchaswoodandbone,possesshelicoidmicrostructuresatmicroscale,whichcanserveasreinforcingelementstotransferstressbetweencracksurfacesandimprovethefracturetoughnessoftheircomposites.Failureprocesses,suchasfiber/matrixinterfacedebondingandslidingassociatedwithpull-outofhelicalfibers,areresponsiblemainlyforthehighenergydissipationneededforthefracturetoughnessenhancement.Herewepresentsystemicanalysesofthepull-outbehaviorofahelicalfiberfromanelasticmatrixviathefiniteelementmethod(FEM)simulation,withimplicationsregardingtheunderlyingtougheningmechanismofhelicoidmicrostructures.Wefindthat,throughtheiruniformcurvatureandtorsion,helicalfiberscanprovidehighpull-outforceandlargeinterfaceareas,resultinginhighenergydissipationthataccounts,toalargeextent,forthehightoughnessofbiologicalmaterials.Thehelicityoffibershapeintermsofthehelicalanglehassignificanteffectsontheforce-displacementrelationshipsaswellasthecorrespondingenergydissipationduringfiberpull-out.

简介：上演注射者展出了大潜力完成低排出物并且正在成为许多民用的飞机的更好的选择。而且，它正在答应在军事引擎采用这个注射者图案，它要求大多数空气进入的燃烧通过到还原剂烟排放的注射者的燃烧室。然而，瘦上演注射者在低负担操作对燃烧不稳定性和扑灭敏感，因此为拓宽它的稳定的操作范围的技术为它在真实引擎的申请是关键的。

简介：Out-of-planebucklingofanisotropicelasticplatesubjectedtoasimpleshearisinvestigated.Fromexact3-Dequilibriumconditionsofanisotropicelasticbodywithaplaneofelasticsymmetryatcriticalconfiguration,theequtionforbucklingdirection(bucklingwavedirection)parameterisderivedandtheshapefunctionsofpossiblebucklingmodesareobtained.Thetractionfreeboundaryconditionswhichmustholdontheupperandlowersurfacesofplateleadtoalineareigenvalueproblemwhosenontrivialsolutionsarejustthepossiblebucklingmodesfortheplate.Thebucklingconditionsforbothflexuralandbarrelingmodesarepresented.Asaparticularexampleofbucklingofanisotropicelasticplate,thebucklingofanorthotropicelasticplate,whichissubjectedtosimpleshearalongadirectionmakinganarbitraryangleofθwithrespecttoanelasticprincipalaxisofmaterials,isanalyzed.Thebucklingdirectionvarieswithθandthecriticalamountofshear.Thenumericalresultsshowthatonlytheflexuralmodecanindeedexist.

简介：Possibilitiesforenhancementofcatalyticreactionratebycombiningphasetransfercatalysisandhydrogenbondingofthecatalystwiththesubstrateandreagentwerestudied.Aphasetransfercatalystlibrarywithsixtypolystyrene-supportedquaternaryammoniumsaltcatalystswassynthesized.ThereductionofacetophenonebyNaBH4wasusedastheprobingreactiontoselectouttheostactivecatalystinthelibrarybyusingiterativemethod.whichwasthegel-typetriethanolamineaminsatingstronglyasicanionexchangeresinwiththecrosslinkingdegereeof2%Ahydrogenbondingassistedcatalyticmechanismwasproposedtoexplainthehighcatalyticactivityofthecatalyst.

简介：Anovelread-onlysuper-resolutionopticaldiscstructure(substrate/masklayer/dielectriclayer)ispropsedinthispaper.ByusingaSithinfilmasthemasklayer,therecordingpitswithadiameter380nmandadepth50nmarereadoutonthedynamicmeasuringequipment;thelaserwavelengthλis632.8nmandthenumericalapertureis0.40.IntheoftheSithinfilmis18nmandthesignal-to-noiseratiois32dB.

简介：ThedecompositionoftherepresentationsT0(v∈R)oreconsideredhere.ThePlancherelformulafortheuniversalcoveringgroupofSU(1,1)isalsodeduced.

简介：Anovelmethodforconvertinganarrayofout-of-phaselasersintooneofin-phaselasersthatcanbetightlyfocusedispresented.Themethodexploitssecond-harmonicgenerationandcanbeadaptedfordifferentlaserarraysgeometries.Experimentalandcalculatedresults,presentedfornegativelycoupledlasersformedinasquare,honeycomb,andtriangulargeometriesareingoodagreement.

简介：Improvementonextinctionandpollutionemissionhavebecomeoneofthemostprominentresearchtopicsingasturbine.Itiswidelyrecognizedthatthefuel/airmixturedistributionintherecirculationzoneisacriticalfactorinimprovingleanblow-out(LBO)andignition.Thispaperproposedanewlowemissionschemewithfuelstagedcentrallyandhybridinjectortoimproveflameoutandemission.Arelativesmallamountoffuelentersintocentralpilotairblastatomizerburnerandthenatomizedbyinnerswirlair.Theremainingmajorityoffuelisdirectlyinjectedintovanechannelsoftheprimaryswirlerthroughaseriesofholeslocatedonthesidewallofthemainstage.Onlypilotstageisfueledunderignitionandleanflameoutcondition.Theuniformityoffuel/airmixturedistributionintheprimaryzoneofthenewdesigndecreasesNOXemission,meanwhilethefuelairmixtureinpilotrecirculationzoneislocallyrichtoimproveflameoutandignition.Experimentalinvestigationwasconductedtocomparethenewschemewithbaselinedesignofdual-swirlerintermsofLBOandignitioncharacteristicsunderthesameconditioninamulti-sectorcombustor.Itisfoundthatthefuel-airratioofignitionlimitandLBOdecreasewiththereferencevelocityincreasing.Theexperimentalresultsalsoshowthatthenewschemesuccessfullyimproveleanblow-outandbroadentheoperationrangeofthecombustor.Theexperimentalresultsindicatedthatthecentrallystagedschemecanwidentheoperationboundaryofthecombustorandcanprovideguidancefordesignandoptimizationofcombustionchamber.

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