简介:ThefundamentalsolutionsoftheorthotropicthickplatestakingintoaccountthetransversesheardeformationarederivedbymeansofHrmander’soperatormethodandaplane-wavedecompositionoftheDiracδ-functioninthispapey.Theboundaryintegralequationsofthethickplateshavebeenformulatedwhichareadaptedtoarbitraryboundaryconditionsandplaneforms.Thenumericalcalculationofthefundamentalsolutionsisdiscussedindetail.SomenumericalexamplesareanalyzedwithBEM.
简介:Amethodhasbeendevisedtoanalyzemultilayerelectricallythickcircularmi-crostripantennaexcitedbyaprobe.Thecurrentontheprobeistakentobeuniform.Thismethodwasverifiedbyanalysisandexperimentofanelectricallythickcircularmicrostripan-tennawithanairgap.BasedonthefreespaceelectricdyadicGreen’sfunction,thefieldexpressionofanhorizontalelectricdipole(HED),whichislocatedatanypointofthemultilayermediaandpointsinanydirection,hasbeenderived.ByusingthisfieldexpressionandtheRichmondre-actionequation,anintegralequationintermsofelectriccurrentonthepatchisformulated.Byproperlychoosingcurrentexpansionmodes,thismethodcanbeusedforanelectricallythickmi-crostripantenna.Thetheoreticalresultsagreeverywellwithexperimentaldataforanelectricallythickcircularmicrostripantennawithanairgap.
简介:摘要:Thick translation是文化、文学经典跨文化翻译的一种重要途径,其研究在国内外都是较新的领域。国内近二十年产生了一批相关成果,其中个案研究居多,且存在概念的误读误用,多个译名混用的现象,理论深度和研究方法有待加强。在深入有关thick translation的理论研究的基础上,未来研究趋向在于深化其描写性和规定性研究,以促进该理论的健康发展,有效发挥其描写和解释翻译现象,评价和指导翻译实践的作用。
简介:Weinvestigateeffectsofannealingonmagneticpropertiesofathick(Ga,Mn)Aslayer,andfindadramaticincreaseoftheCurietemperaturefrom65to115Kbypostgrowthannealingfora500-nm(Ga,Mn)Aslayer.AugerelectronspectroscopymeasurementssuggestthattheincreaseoftheCurietemperatureismainlyduetodiffusionofMninterstitialtothefreesurface.Thedouble-crystalx-raydiffractionpatternsshowthatthelatticeconstantof(Ga,Mn)Asdecreaseswithincreasingannealingtemperature.Asaresult,theannealinginducedreductionofthelatticeconstantismainlyattributedtoremovalofMninterstitial.
简介:Inthispaper,amethodofconstructingdisplacement-basedelmentforthick/thinplatesisdevel-opedbyusingthetechniqueofgeneralizedcompatibility,andarectangulardisplacement-basedelementwith12degreesoffreedomforthick/thinplatesispresented.Thismethodenjoysagoodaccuracywithsimpleformulationandisfreeofshear-lockingasthethicknessoftheplateapproacheszero.
简介:一个网孔为解决中等厚的盘子的有弹性的动态问题的更少的本地光线的点插值方法(LRPIM)在这篇论文被介绍。板的discretized系统方程用一个局部地加权的剩余方法被获得。它使用一个光线的基础功能(RBF)作为试用功能,和使用结合了多项式基础功能是的四次的花键功能加权的剩余方法的测试功能。形状功能有Kronecker三角洲功能,和没有另外的处理的性质被做强加必要边界条件。为解决动态问题的Newmark方法在计算被采用。动态性质上的照子域和影响领域的尺寸的效果被调查。数字结果证明介绍方法能为中等厚的板的有弹性的动态问题给相当精确的结果。
简介:Atwo-dimensionalsteadyReynolds-averagedNavier–Stokes(RANS)equationwassolvedtoinvestigatetheeffectsofaGurneyflaponSFYT15thickairfoilaerodynamicperformance.Thisairfoilwasdesignedforflightvehicleoperatingat20kmaltitudewithfreestreamvelocityof25m/s.Thechordlength(C)is5mandtheReynoldsnumberbasedonchordlengthisRe=7.76×105.Gurneyflapswiththeheightsrangingfrom0.25%Cto3%Cwereinvestigated.Theshearstresstransport(SST)k-ωturbulencemodelwasusedtosimulatetheflowstructurearoundtheairfoil.ItisshowedthatGurneyflapcanenhancenotonlytheprestallliftbutalsolift-to-dragratioinacertainrangeofanglesofattack.Specially,atcruiseangleofattack(α=3°),Gurneyflapwith0.5%Cheightcanincreaselift-to-dragratioby2.7%,andliftcoefficientby12.9%,respectively.Furthermore,thesurfacepressuredistribution,streamlinesandtrailing-edgeflowstructurearoundtheairfoilareillustrated,whicharehelpfultounderstandthemechanismsofGurneyflaponairfoilaerodynamicperformance.Moreover,itisfoundthattheincreaseofairfoildragwithGurneyflapcanbeattributedtotheincreaseofpressuredragbetweenthewindwardandtheleewardsidesofGurneyflapitself.
简介:Theequationofstressintensityfactors(SIF)ofinternallypressurizedthick-walledcylinderwasusedasthereferencecase.SIFequationofrotatingthick-walledcylindercontainingaradialcrackalongtheinternalborewaspresentedinweightfunctionmethod.Theweightfumctionformulaswereworkedoutandcanbeusedforallkindsofdepthofcracks,rotatingspeed,material,sizeofthick-walledcylindertocalculatethestressintensityfactors.Theresultsindicatedthevalidityandeffectivenessoftheseformulas.Meanwhile,therulesofthestressintensityfactorsinrotatingthick-walledcylinderwiththechangeofcrackdepthsandtheratioofouterradiustoinnerradiuswerestudied.Thestudiesarevaluabletoengineeringapplication.
简介:Stimulatedemissiondepletion(STED)microscopyisoneoffar-fieldopticalmicroscopytechniquesthatcanprovidesub-diffractionspatialresolution.ThespatialresolutionoftheSTEDmicroscopyisdeterminedbythespeciallyengineeredbeamprofileofthedepletionbeamanditspower.However,thebeamprofileofthedepletionbeammaybedistortedduetoaberrationsofopticalsystemsandinhomogeneityofaspecimen’sopticalproperties,resultinginacompromisedspatialresolution.Thesituationgetsdeterioratedwhenthicksamplesareimaged.Intheworstcase,theseveredistortionofthedepletionbeamprofilemaycausecompletelossofthesuperresolutioneffectnomatterhowmuchdepletionpowerisappliedtospecimens.Previouslyseveraladaptiveopticsapproacheshavebeenexploredtocompensateaberrationsofsystemsandspecimens.However,itisdifficulttocorrectthecomplicatedhigh-orderopticalaberrationsofspecimens.Inthisreport,wedemonstratethatthecomplicateddistortedwavefrontfromathickphantomsamplecanbemeasuredbyusingthecoherentopticaladaptivetechnique.Thefullcorrectioncaneffectivelymaintainandimprovespatialresolutioninimagingthicksamples.
简介:Inthispaper,theperformancecharacteristicsofASTMA19QS31803andASTMA1S2F51duplexstainlesssteelwereintroduced,andtheweldabilitieswereanalyzed.Theweldingrepairproceduresofthickwallduplexstainlesssteelweredevelopedbyweldingprocedurequalification.Researchshowsthattherepairweldinghaslesseffectonmechanicalpropertiesofweldedjointsandgreatinfluenceonphaseproportionsandpittingcorrosionresistance.Thetestresultsmeettherequirementsofprojectspecifications.Therepairweldingprocedurecanbeusedinproject,andonlyonetimerepairshallbeused.
简介:Bygivingupanyassumptionsaboutdisplacementmodelsandstressdistribution,themixedstateHamiltonequationfortheaxisymmetricproblemofthethicklaminatedclosedcantilevercylindricalshellsisestablished.Anidenticalanalyticalsolutionisobtainedforthethin,moderatelythickandthicklaminatedclosedcantilevercylindricalshells.Allequationsofelasticitycanbesatis-fied,andallelasticconstantscanbetakenintoaccount.
简介:ThickGaNfilmsweregrownonthesapphiresubstratebyhydridevapourphaseepitaxy.ThepropertiesofGaNfilmswerefoundtobesignificantlyinfluencedbythedurationofexposingthesapphiresubstratetoammoniapriortotheGaNgrowthinitiation.ThecrystallinequalityofGaNfilmsrevealedbyhighresolutionX-raydiffractionwerestronglydependentonthenitridationtime,whichdeterminedsubstratesurfacetopography.ThedifferentnitridationschemesstronglyaffectedthemorphologyofGaNoverlayersresultingintheblueshiftofthemainexcitonicpeakinphotoluminescencespectraatroomtemperature.
简介:UsingtheexampleofthePHELIXhigh-energyshortpulselaserwediscussthetechnicalpreconditionstoinvestigateionaccelerationwithsubmicrometerthicktargets.Weshowhowthetemporalcontrastofthissystemwasimprovedtopreventpre-ionizationofsuchtargetsonthenanosecondtimescale.Furthermoretheinfluenceoftypicalfluctuationsoruncertaintiesoftheon-targetintensityonionaccelerationexperimentsisdiscussed.Wereporthowtheseuncertaintieswerereducedbyimprovingtheassessmentandcontroloftheon-shotintensityandbyoptimizingthepositioningofthetargetintothefocalplane.Finallywereportonexperimentalresultsshowingmaximumprotonenergiesinexcessof85MeVforionaccelerationviathetargetnormalsheathaccelerationmechanismusingtargetthicknessesontheorderofonemicrometer.
简介:Thispaperdemonstratestheplanestressstateandthestressfreethermo-elasticdeformationofFGMthickplateunderthermalloading.First,theSneddon-LocketttheoremontheplanestressstateinanisotropicinfinitethickplateisgeneralizedforacaseofFGMprobleminwhichallthermo-mechanicalpropertiesareoptionalfunctionsofdepthco-ordinate.TheproofisbasedonapplicationoftheIljushinthermo-elasticpotentialtodisplacementtypesystemofequationsthatreducesittotheplanestressstateproblem.Thenanexistenceofthepurelythermaldeformationisprovedintwoways:first,itisshownthattheuniquesolutionfulfilsconditionsofsimultaneousconstanttemperatureandlineargradationofthermalexpansioncoefficient,second,proofisbaseddirectlyonstresstypesystemofequationswhichstraightforwardlyreducestocompatibilityequationsforpurelythermaldeformationifonlystressfieldishomogeneousindomainandatboundary.Finally,coupleexamplesofapplicationtoanengineeringproblemarepresented.