简介：Ahybridmodeofone-andtwo-surfacemultipactoronthegrooveddielectricsurfaceisstudiedindetailusingbothananalyticalapproachandtwo-dimensionalparticle-in-cell（2DPIC）simulations.WhenthegroovewidthLeE0/（4πmef2）,bothslopesmayhavethemultipactors.TheelectronsurfacedensityofthemultipactordischargehasasharpincreaseatthelengthL=eE0/（4πmef2）.

简介：Theplasmonicnanogapantennaisanefficientradiatingorreceivingopticaldevice.Theresonancebehaviorofopticalantennasiscommonlyattributedtotheexcitationofalocalizedsurfaceplasmonresonance(LSPR),whichcanbetheoreticallydefinedasthequasi-normalmode(QNM).ToclarifythephysicaloriginoftheLSPR,webuildupananalyticalmodeloftheLSPRbyconsideringamultiplescatteringprocessofpropagativesurfaceplasmonpolaritons(SPPs)ontheantennaarms.ThemodelcancomprehensivelyreproducethecomplexeigenfrequencyandthefielddistributionofQNMsoftheantenna,unveilingthattheLSPRarisesfromaFabry–PerotresonanceofSPPs.Byfurtherapplyingthecomplexpoleexpansiontheoremofmeromorphicfunctions,thefieldoftheantennaunderilluminationbyanearbydipoleemittercanbeanalyticallyexpandedwithQNMs,whichwellpredictsthefrequencyresponseoftheenhancementfactorofradiation.ThepresentmodelestablishesexplicitrelationsbetweentheconceptsoftheLSPRandthepropagativeSPPandintegratestheadvantagesoftheFabry–PerotandQNMformalismsofnanogapantennas.

简介：Tris-(8-hydroxyquinoline)-aluminumeAlq3T–basedorganiclight-emittingdiodeswithCoelectrodearefabricated.Thepositivemagneticelectroluminescence(MEL)andmagneticconductance(MC)areobservedinthesamples,reaching4.35%and1.67%underthefieldof42mTat50K,respectively,andtheMELandMCtracescanbefittedtonon-Lorentzianlineshapes.TheMELvariesasafunctionoftheCothicknessandreachestheoptimalvalueat10nm.TheMELandMCdependenceonvoltageandtemperatureisalsoinvestigated.Theelectron-holepairmodelandthespin-polarizedinjectionmechanismareusedtounderstandtheexperimentalresults.

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简介：因为他们的广泛的应用，无人的表面车辆(USV)成为了研究的一个焦点。保证安全和可靠性并且独立地执行复杂任务，USV被要求拥有环境和有效碰撞回避能力的精确感觉。完成这些，进实时海洋的雷达目标察觉的调查和自治碰撞回避技术被要求，瞄准解决噪音堵塞，在海洋的雷达中的不平的亮度，目标损失，和盲目区域的问题想象。这些技术应该也满足要求即时并且与USV的高航行速度有关的可靠性。因此，这研究基于海洋的雷达开发了一个嵌入的碰撞回避系统，调查了包含适应变光滑的算法和柔韧的分割算法的一个高度即时的目标察觉方法，开发了一个马厩和可靠动态本地环境模型保证USV的安全航行，并且基于调整USV标题和速度在的速度障碍(V障碍)构造了一个碰撞回避算法即时。在多障碍回避的海试用结果第一表明建议回避系统的有效性和效率，然后当时，验证它的大适应性和相对稳定性航行在真实、复杂的海洋的环境的USV。获得的结果将改进USV的聪明的水平并且保证USV独立人士航行的安全。

简介：Anexperimentaltechniquehasbeendevelopedformeasuringandvisualizingstraindistributiononfacialskin.Astereovisiontechniquebasedondigitalimagecorrelationisemployedforobtainingthedisplacementdistributiononthehumanface.Time-variationofthemovementofthefacialskinsurfaceisobtainedfromconsecutiveimagesobtainedusingapairofhigh-speedcameras.Thestrainsonthefacialskinsurfacearethenobtainedfromthemeasureddisplacements.Theperformanceofthedevelopedsystemisdemonstratedbyapplyingittothemeasurementofthestrainonfacialskinduringtheproductionofsound.Resultsshowthatthestrainsonfacialskincanbevisualized.Furtherdiscussionontherelationshipbetweenthecreationofwrinklesandstrainsispossiblewiththehelpofthedevelopedsystem.

简介：ThisstudyconcernscalculationofphasedarraybeamfieldsofthenonlinearRayleighsurfacewavesbasedontheintegralsolutionsforanonparaxialwaveequation.SincetheparabolicapproximationmodelfordescribingthenonlinearRayleighwaveshascertainlimitationsinmodelingthesoundbeamfieldsofphasedarrays,amoregeneralmodelequationandintegralformsofquasilinearsolutionsareintroduced.SomefeaturesofsteeredandfocusedbeamGeldsradiatedfromalinearphasedarrayofthesecondharmonicRayleighwavearepresented.

简介：Angularcoloruniformity(ACU)isakeyfactorusedtoevaluatethelightqualityofwhite-lightemittingdiodes(LEDs).Inthisstudy,anoveldoubleremotemicro-patternedphosphorfilm(doubleRMPPfilm)wasusedtoenhancetheACUofaremotephosphor(RP)down-lightlamp.AconventionalRPfilmandremotephosphorfilmwithsinglemicro-patternedfilm(singleRMPPfilm)alsowereexaminedforcomparison.Theangularcorrelatedcolortemperature(CCT)distributionsandtheopticalperformanceofthefilmswereexperimentallymeasured.ThemeasurementresultsshowedthatdoubleRMPPfilmconfigurationexhibitedbettercoloruniformitywithaCCTdeviationofonly441K,comparedwith556KforthesingleRMPPfilmconfigurationand1390KfortheRPfilmconfiguration.AsimulationbasedonFDTDandraytracingcombinedmethodalsoconfirmedtheACUimprovement.Inaddition,comparedwiththeconventionalRPfilm,theluminousefficiencyofsingleanddoubleRMPPfilmconfigurationswasincreasedby6.68%and4.69%,respectively,atadrivingcurrentof350mA.TheenhancementoftheACUandluminousefficiencyareduetothescatteringandmixingeffectofthemicropatternedfilm.Moreover,thedoubleRMPPfilmconfigurationhadbetterCCTstabilityatdifferentcurrentsthantheothertwoconfigurations.TheresultsdemonstratedtheeffectivenessandsuperiorityofdoubleRMPPfilminwhiteLEDapplications.

简介：Thedetailsofthespecialthree-dimensionalmicro-nanoscalerippleswithaperiodofhundredsofmicronsonthesurfacesofaZr-basedandaLa-basedmetallicglassirradiatedseparatelybysinglelaserpulseareinvestigated.Weusethesmall-amplitudecapillarywavetheorytounveiltherippleformationmechanismthroughconsideringeachofthemoltenmetallicglassesasanincompressibleviscousfluid.Ageneralizedmodelispresentedtodescribethespecialmorphology,whichfitstheexperimentalresultwell.Itisalsorevealedthattheviscositybringsaboutthebiggesteffectonthemonotonedecreasingnatureoftheamplitudeandthewavelengthofthesurfaceripples.Thegreatertheviscosityis,theshortertheamplitudeandthewavelengthare.

简介：Inthispaper,polyimide(PI)filmsaremodifiedusinganatmosphericpressureplasmageneratedbyadielectricbarrierdischarge(DBD)inargon.SurfaceperformanceofPIfilmanditsdependenceonexposuretimefrom0sto300sareinvestigatedbydynamicwatercontactangle(WCA),fieldemissionscanningelectronmicroscopy(FESEM),andFouriertransforminfraredspectroscopyinattenuatedtotalmultiplereflectionmode(FTIR-ATR).ThestudydemonstratesthatdynamicWCAexhibitsaminimumwith40splasmatreatment,andevenlydistributednano-dotsandshadowconcavesappearedfor40sand12sArplasmatreatmentindividually.AshortperiodofplasmamodificationcancontributetothescissionoftheimideringandtheintroductionofC-OandC=O(-COOH)bydetailedanalysisofFTIR-ATR.

简介：Asameansofsurfacemodificationprocess,metalsurfacenanocrystallization(MSN)hasattractedwidespreadattentionandenjoyedagreatprospect.However,currentlylittleresearchiscarriedoutregardingMSNofweldedjoint.Theprocessesofhighenergyshotpeening(HESP)technologyandultrasonicimpacttreatment(UIT)werecarriedouttoachievejointsurfacenanocrystallization.ThegrainsizeofbeforeandaftertheweldedjointsurfacenanocrystallizationwerecomparativelyanalyzedwithX-raydiffractometer,thesurfacedeformationlayerthicknessofbeforeandaftertheweldedjointsurfacenanocrystallizationwerecomparativelyanalyzedwithopticalmicroscopy,thesurfacehardnessofbeforeandaftertheweldedjointsurfacenanocrystallizationwerecomparativelyanalyzedwithmicrohardnessmachine.TheresultsshowthatbothoftheprocessescanachieveweldedjointsurfacenanocrystallizationandtheweldafterHESPhavesmallergrainsize,largerdeformationlayerthicknessandhigherhardnessvaluesthanthoseafterUIT.However,HESPisrestrainedbytheshapesandsizesofweldingmaterials,sotheUITprocessispreferredtouseinthegeneralengineeringpracticalapplications.

简介：YPO_4phosphorssingle-dopedwithSb~（3＋）orGd~（3＋）andco-dopedwithSb~（3＋）andGd~（3＋）werepreparedbyasolid-statereactionmethod.Thephasepurity,morphology,photoluminescenceexcitationandemissionpropertiesofthepreparedphosphorswereinvestigated.TheresultsshowedthatSb~（3＋）couldsensitizeGd~（3＋）intheco-dopedphosphorswhichmadethephosphorsexcitablebyshort-waveultraviolet（UV）atawavelengthbetween220and260nm.Under253.7nmexcitation,theco-dopedphosphorsY_（1–x–y）PO_4：Sb~（3＋）x,Gd~（3＋）yshowedstrongemissionofGd~（3＋）atawavelengthof312nmwhoseintensitychangedwiththedopingconcentrationsofGd~（3＋）andSb~（3＋）.TheoptimizedY_（0.77）PO_4：Sb~（3＋）0.07,Gd~（3＋）0.16phosphorshowedanintensitycomparabletocommercialLaPO_4：Cephosphor（UVB-315）,makingitapotentialcandidateformercurylow-pressuredischargenarrow-bandUV-Bemittinglamps.

简介：碳nanofibers(CNF)的表面functionalization被执行，ie，CNF第一被氧化然后表面经由一个集会方法是由3-Aminopropyltriethoxysilane(APTES)的silanized。一种新类型高穿抵抗s-CNFs/epoxy合成被制作由在原处反应。FTIR光谱学被用来检测silane在CNF的表面上生产的功能的组的变化。tribological性质和微观结构修改，未修改的CNFs/epoxycomposites分别地被学习。expremental结果显示APTEScovalently成功地被连接到CNF的表面并且在环氧基树脂矩阵改进CNF的分散。磨擦系数和s-CNFs/epoxycomposites的wear率是比在一样的负担下面的u-CNFs/epoxycomposites的那些显然低的。调查也显示磨料穿主要为u-CNFs/epoxy穿机制合成，为在一样的滑动下面合成的s-CNFs/epoxy与细微粘合剂穿穿状况。

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简介：Thecharacteristicmodificationsarereportedonthesurfaceofpolymericwaveguidefilmintheprocessofvolume-gratingfabrication.Thelightfromamode-locked76MHzfemtosecondlaserwithpulsedurationof200fsandwavelengthof800nmisfocusednormaltothesurfaceofthesample.Thesurfacemorphologymodificationsareascribedtoafactthatsurfaceswellingoccursduringtheprocess.Periodicmicro-structureisinscribedwithincreasingincidentpower.Thelaser-inducedswellingthresholdonthegrating,whichishigherthanthatoftwo-photoninitiatedphoto-polymerization(TPIP)(8mW),isverifiedtobeabout20mW.Itisfeasibletoenhancethesurfacesmoothnessofintegratedopticsdevicesforfurtherencapsulation.Thevariationofmodulationdepthisstudiedfordifferentvaluesofincidentpowerandscanspacing.Ablationaccompaniedwithsurfaceswellingappearswhenthepowerishigher.Byoptimizingthelasercarvingparameters,highlyefficientgratingdevicescanbefabricated.

简介：Thesurfaceshapeofliquidwateriswellcontrolledduringnanosecondpulselaserablationplasmapropulsion.Inthisstudy,wemeasuredtheeffectoftheshapeonthecouplingcoefficientandthespecificimpulse.Wefoundthatthecouplingcoefficientandspecificimpulsecouldbeoptimizedbyvaryingthesurfaceconvexity.Basedontheanalysisofthesurfaceradiuscurvature,wedemonstratethattheconvexsurfacechangesthelaserfocalpositionstoachievehighefficiency.

简介：Inthispaper,variousstrategiesofspiralirradiatingschemefortheflameformingofabowlshapedsurfaceareinvestigatedexperimentallyandnumerically.Experimentalworkisperformedusingaflametorchintegratedwitha2-axisCNCworkstation.TheABAQUSimplicitsolverisusedinthenumericalsimulation.Threedifferentstrategiesofthespiralirradiatingschemeareinvestigatedfortheflameformingofabowlshapedsurface.ThefirststrategyistheSimplespiralirradiatingscheme,thesecondistheRotationalspiralirradiatingscheme,andthethirdistheSymmetrical-Rotationalspiralirradiatingscheme.TheresultsshowthatusingtheSymmetricalRotationalspiralirradiatingscheme,abowlshapedsurfacewiththemaximumdeformationcanbeproduced,followedbyusingtheRotationalscheme,andtheSimplespiralscheme.ItisalsoconcludedfromtheresultsthatthespiralirradiatingschemewithSymmetrical-Rotational,RotationalandSimplespiralschemesleadtothemaximumsymmetriesintheproducedbowlshapedsurface,respectively.Allthenumericalresultsareingoodagreementwiththeexperimentalobservations.

简介：Theinfluenceofp-typeGaN(pGaN)thicknessonthelightoutputpower(LOP)andinternalquantumefficiency(IQE)oflightemittingdiode(LED)wasstudiedbyexperimentsandsimulations.TheLOPofGaN-basedLEDincreasesasthethicknessofpGaNlayerdecreasesfrom300nmto100nm,andthendecreasesasthethicknessdecreasesto50nm.TheLOPofLEDwith100-nm-thickpGaNincreasesby30.9%comparedwiththatoftheconventionalLEDwith300-nm-thickpGaN.ThevariationtrendofIQEissimilartothatofLOPasthedecreaseofGaNthickness.ThesimulationresultsdemonstratethatthehigherlightefficiencyofLEDwith100-nm-thickpGaNisascribedtotheimprovementsofthecarrierconcentrationsandrecombinationrates.