简介：AnovelmethodtocorrectdiffractioneffectinmeasurementofultrasonicvelocityandattenuationathighfrequenciesisdevelopedbyusingthesuperpositiontechniqueofGaussianbeams.Toexaminethevalidityofthisnumericalapproach,theamplitudelossandphaseadvanceduetothediffractioneffectforanSiO2specimenarenumericallycalculatedin30-240MHz,andtheresultsareingoodagreementwiththosebythePapadakismethod.

简介：Toreducethewind-induceddragandimprovethewind-resistanceperformanceofahigh-risebuilding,steadysuctioncontrolisintroducedintothebuildingstructure.Basedonvalidationofthenumericalmethodsbyexperimentwithsuctioncontrolovertheflowseparationofa3Dbackward-facingstep,theReynoldsstressequationmodelisusedtoinvestigatethedragreduction(DR)propertiesofahigh-risebuildingwhosesidefacesarecontrolledbyall-heightsuction.EffectsoftheorificegeometricalparametersandsuctionfluxparametersontheDRandtheseparationcontrolareanalyzed,andthedetailedflowfieldsareshowntoclarifythemechanismofsuctioncontrol.Theresultsindicatethatsuctioncontrolisveryeffectiveinreducingthewindloadsonthehigh-risebuildingmodel,andonlythedimensionlesssuctionfluxdominates.Lastly,thepowerconsumedandthecounterforceinducedbysuctionarediscussed,thesuctionmodelsbecomethe'zero-drag'modelundercertainsuctionangles.

简介：有数组结构的InGaN/GaNmulti-quantum-well-structure激光二极管成功地在蓝宝石底层上被制作。激光二极管由在一个激光薄片上分享普通电极的四根emitter条纹组成。一个800-mm-long洞被劈开底层沿着形成(1100)取向使用激光scriber。激光数组二极管的阀值电流和电压分别地是2A和10.5V。在在房间温度的搏动的当前的注射下面的12W的轻产量山峰力量被完成。我们模仿电的性质在共面的结构和最小化在不同山脉和n电极之间的距离的差别并且增加n类型的电的电导率轧了的结果表演轧了基于的激光二极管是在emitter条纹改进搬运人分发的一致性的二个有效方法。一个薄片上的二emitters被安排在二n电极垫附近位于左边，右边，和四条纹emitters一起装激光。激光二极管在阀值电流上面在408和409nm显示出轻输出的二座锋利的山峰。在为平行、垂直的远域模式的半最大值的完整的宽度分别地是8o和32o。[从作者抽象]

简介：Wepresenta940nmquasi-continuouswavesemiconductorlaserdesignedasabuildingblockforhigh-powerfibercoupledpumpmodules.Thelasercomprisesa400μmnarrow-stripearraymountedonanaluminumnitridesubstrateusinghardsolder.Thechiphasbeenoptimizedforhighopticalpowerandlowlateralfar-fieldangles.Twoverticalandsixlateralstructurevariationshavebeeninvestigatedtodeterminethebestachievableperformance.Operatingat1mspulsewidthandarepetitionrateof10Hz,thelaserdevicereachesamaximumpulsepowerof86Wfroma400μmapertureandmorethan62%maximumconversionefficiency.Lowlateralfar-fieldangles(95%powerenclosed)of11.5and13.5,dependingontheepitaxialdesign,enableefficientmultimodefibercoupling.Thepotentialforhighlyreliableapplicationshasbeendemonstrated.

简介：最近的研究证明了联机录像成像是为监视结晶化过程的一种很有希望的技术。当需要柔韧、快、有能力处理的图象分析由于操作象混合和稳固的集中那样的条件的时间的变化改变了图象质量，在为即时靠近环的控制使用这种技术的瓶颈被考虑。因为晶体趋于重叠或属于对方，在高固体的集中的图象分析结果极其挑战性，在晶体之间的边界通常是模糊的。这篇论文论述能有效地处理在高固体的集中拿的图象的一个图象分割算法。方法片断晶体在水晶块的轮廓上沿着主要相关的凹面点属于对方。详细过程在一个热阶段的反应堆用申请被介绍给l-glutamic酸的结晶化。

简介：Usingtherecentlydevelopedfinite-basis-setmethodwithBsplines,excitedstatesofHatomsinamagneticfieldhavebeencalculated.Energylevelsarepresentedforthetenexcitedstates,2s_0,3d′_0,3p_0,3d_(-1),3d_(-1),4d_(-1),3d_(-2),4d_(-2),4f_(-2),and5f_(-2)asafunctionofmagneticfieldstrengthswitharangefromzeroupto2.35×10~6T.Theobtainedresultsarecomparedwithavailablehighaccuracytheoreticaldatareportedintheliteratureandfoundtobeinexcellentagreement.Thecomparisonalsoshowsthatthecurrentmethodcanproduceenergylevelswithanaccuracyhigherthantheexistinghighaccuracymethod[Phys.Rev.A54(1996)287].Herehighaccuracyenergylevelsareforthefirsttimereportedforthe3d′_0,4d_(-1),4d_(-2),4f_(-2),and5f_(-2)states.

简介：Withthedevelopmentoflasertechnologies,multi-colorlight-fieldsynthesiswithcompleteamplitudeandphasecontrolwouldmakeitpossibletogeneratearbitraryopticalwaveforms.Apracticaloptimizationalgorithmisneededtogeneratesuchawaveforminordertocontrolstrong-fieldprocesses.Wereviewsomerecenttheoreticalworksoftheoptimizationofamplitudesandphasesofmulti-colorlaserstomodifythesingle-atomhigh-orderharmonicgenerationbasedongeneticalgorithm.Bychoosingdifferentfitnesscriteria,wedemonstratethat:(i)harmonicyieldscanbeenhancedby10to100times,(ii)harmoniccutoffenergycanbesubstantiallyextended,(iii)specificharmonicorderscanbeselectivelyenhanced,and(iv)singleattosecondpulsescanbeefficientlygenerated.Thepossibilityofoptimizingmacroscopicconditionsfortheimprovedphasematchingandlowdivergenceofhighharmonicsisalsodiscussed.Thewaveformcontrolandoptimizationareexpectedtobenewdriversforthenextwaveofbreakthroughinthestrong-fieldphysicsinthecomingyears.

简介：TheInternetevolvestoincorporatevery-high-bandwidthopticallinksandmorelarge-delaysatellitelinks.TCPfacesnewchallengesinthisuniqueenvironment.TheoryandexperimentsshowedthatTCPbecomesinefficientandispronetobeunstableastheper-flowproductofbandwidthandlatencyincreases,regardlessofthequeuingscheme.Variable-structurecongestionControlProtocol(VCP)isproposedtoaddresstheseproblems.However,VCPhasproblemintermsofconvergencetime,i.e.,ittakesalongtimeforanewVCPflowtoachievefairbandwidthallocationiftheexistingVCPflowshavelargecon-gestionwindows.ThispaperproposedanExtendedVariable-structurecongestionControlProtocol(EVCP),whichadoptedaconvergencecontroller.Thebasicideaofconvergencecontrolleristhatifaflowhaslargerwindowthanitsfairwindow,itscongestionwindowshouldbedecreasedmoreaggressivelythanusualinMultiplicativeDecrease(MD)phase.SimulationsshowedthatEVCPhasbetterperformanceintermsofconvergencetimewhilekeepingtheadvantagesofVCP.

简介：Thefar-fieldimagingpropertiesofahighindexmicrospherelensspatiallyseparatedfromtheobjectareexperimentallystudied.Ourexperimentalresultsshowthat,foraBlu-raydiskwhosespacingis300nm,thehighindexmicrospherelensalsocandiscernthepatternsoftheobjectsamplewhenthedistancebetweenthelensandtheobjectisupto5.4μm.Whenthedistanceisincreasedfrom0to5.4μm,forthemicrospherelenswithadiameterof24μm,thelateralmagnificationincreasesfrom3.5×to5.5×,whilethefieldofviewdecreasesfrom5.1to3.0μm.Byvaryingthedistancebetweenthelensandtheobject,theopticalimagecanbeoptimized.Wealsoindicatethatthefar-fieldimagingcapabilityofahighindexmicrospherelensisdependentontheelectromagneticfieldintensityprofileofthephotonicnanojetunderdifferentpositionsofthemicrospherelens.

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简介：Variouscosmologymodels,braneoscillationscenarios,interactionofinterstellarplasmawithintenseelectromagneticradiation,andevenhigh-energyphysicsexperiments(e.g.,LargeHadronCollider(LHC))allpredicthighfrequencygravitationalwaves(HFGWs,i.e.,high-energygravitons)inthemicrowavebandandhigherfrequencyregion,andsomeofthemhavelargeenergydensities.Electromagnetic(EM)detectiontosuchHFGWswouldbesuitableduetoveryhighfrequenciesandlargeenergydensitiesoftheHFGWs.WereviewseveraltypicalEMdetectionschemes,i.e.,inverseGertsenshteineffect(G-effect),couplingoftheinverseGeffectwithacoherentEMwave,couplingofplanarsuperconductingopencavitywithastaticmagneticfield,cylindricalsuperconductingclosedcavity,andtheEMsychro-resonancesystem,anddiscussrelatedminimaldetectableamplitudesandsensitivities.Furthermore,wegivesomenewideasandimprovementwaysenhancingthepossibilityofmeasuringtheHFGWs.ItisshownthatthereisstillalargeroomforimprovementforthoseschemestoapproachandevenreachuptherequirementofdetectionofHFGWsexpectedbythecosmologicalmodelsandhigh-energyastrophysicalprocess.

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简介：Polymernanoparticleswerepreparedinthemethylmethacrylate(MMA)/butylmethacrylate(BA)emulsioncopolymerizationprocessbyamodifiedmicroemulsioncopolymerizationmethod.2-Hydroxyethylmethacrylate(HEMA),acrylate(AA)andmethylacrylate(MAA)wereusedasreactivecosurfactants.Withthisprocesshighpolymer:surfactantweightratios(40:1orgreater),relativelyconcentrated(～30wt.%)latexesandsmall(～60nm)particlediameterswereobtained.PropertiesofthelatexeswerecharacterizedbyTEM,DSC,dynamiclightscattering,andIRspectroscopy.

简介：ThefluorescenceemissionandX-raydiffractionofmagenesium8-hydroxyquinolinecomplex(Mgq2)havebeenmeasuredathighpressureupto14GPa.Ithasbeenfoundthatpressurecaninfluencetheemissiondramatically.Atrelativelowerpressure(lessthan2.5GPa)thefluorescenceofMgq2changesslightly,buttheemissiondropsquicklywithincreaseofthepressurewhenthepressuregetshigherthan2.5GPa.TheresultsofinsituenergydispersiveX-raydiffractionathighpressurewithsynchrotronradiationindicatethatthereisaphasetransitionatabout2.5-3GPaforMgq2crystal.2001ElsevierScienceB.V.Allrightsreserved.

简介：LatticeBoltzmannmethodisoneofthewidelyusedinmultiphasefluidflow.However,thetwomaindisadvantagesofthismethodaretheinstabilityofnumericalcalculationsduetothelargedensityratiooftwophasesandimpossibilityofthetemperaturedistributiontobefedbackintothevelocitydistributionfunctionwhenthetemperatureissimulated.BasedonthecombinationprescribedbyInamuro,thelargedensityratiotwo-phaseflowmodelandthermalmodelmakesthedensityratioofthemodelsimulationtobeincreasedto2778:1byoptimizingtheinterfacedistributionfunctionoftwo-phasewhichimprovestheaccuracyofdifferentialformat.Thephasetransitiontermisaddedassourcetermintothedistributionfunctioncontrollingtwophaseorderparameterstodescribethetemperatureeffectonthegas-liquidphasetransition.Thelatentheatgeneratedfromthephasechangeisalsoaddedasasourcetermintothetemperaturedistributionfunctionwhichsimulatesthemovementoftheflowunderthecommoncouplingofdensity,velocity,pressureandtemperature.Thedensityandthetemperaturedistributionofsinglebubblearesimulated.Comparisonofthesimulationresultswithexperimentalresultsindicatesagoodagreementpointingouttheeffectivenessoftheimprovedmodel.

简介：Wereviewtheuseofhollow-corephotoniccrystalfibre(HC-PCF)forhighpowerlaserbeamdelivery.AcomparisonofbandgapHC-PCFwithKagome-latticeHC-PCFonthegeometry,guidancemechanism,andopticalpropertiesshowsthattheKagome-typeHC-PCFisanidealhostforhighpowerlaserbeamtransportationbecauseofitslargecoresize,lowattenuation,broadbandtransmission,single-modeguidance,lowdispersionandtheultra-lowopticaloverlapbetweenthecore-guidedmodesandthesilicacore-surround.ThepowerhandlingcapabilityofKagome-typeHC-PCFisfurtherexperimentallydemonstratedbymillijoulenanosecondlasersparkignitionand~100μJsub-picosecondlaserpulsetransportationandcompression.

简介：与数字方法的发展，数字计算要求越来越高的精确性。这份报纸被奉献给为热方程吸收边界条件(ABC)的高顺序的本地人。我们证明联合系统在计算领域产出在获得的高顺序的本地ABC和部分微分方程之间的一个稳定的问题。这个方法仅仅最近在波浪繁殖模型广泛地被使用了。我们扩大方法论的精神到寓言的，它将成为一个基础为非线性的PDE的一个班设计本地ABC。一些数字测试证明新处理很有效、易控制。[从作者抽象]

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简介：WithrapideconomicandsocialdevelopmentinChina,high-risebuildingshavecontinuouslysprungupsince2006.However,severalbigfireaccidentsinhigh-risebuildingssuchastheBeijingTelevisionCulturalCenterfirein2009andtheShanghaiJing’anDistrictfirein2010etc.haveclaimedpeople’slivesandcausedhugeamountsofeconomicandpropertylosses,thusresultingingreatsocialresponse.Thiscircumstancehascausedgraveconcernfromthepublicand

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