简介：这篇论文在一个接近音速的轴的压缩机转子(NASA转子37)的空气动力学的表演上论述轴的不一致的尖端清理的效果的数字调查。在转子经过以内的三维的稳定的流动地以17188.7rpm的设计车轮速度与0.356公里的资料尖端清理被模仿。模拟结果与测量结果很好一致，它验证了数字方法。然后，在转子经过以内的三维的稳定的流动地与不同轴的不一致的尖端清理分别地被模仿。计算结果证明最佳的轴的不一致的尖端清理能改进压缩机表演，当效率和压缩机的压力比率被增加时。流动机制是轴的不一致的尖端清理能削弱尖端漏旋涡，在界面层刮倒低精力的液体并且减少流动阻塞和尖端损失。

简介：Hugoniotrelationsofatwo-dimensionalaxialshockwithcurrentandmagneticfieldinacylindricalshocktubewereinvestigatedbyanumericalmethod.Theradialprofilesofthemagneticfield,electriccurrent,pressures,flowvelocitiesandtemperaturesbetweentheupanddown-streamradialforce-balancedplasmaoftheshockwererevealedbynumericalanalysis.Itisclearlyfoundthattheaxialshockcanleadtotwoeffects:oneisaninverseskineffect(i.e.,thecurrentdensityrisestowardsthecenteroftheconductor),theanotherisareversedcurrenteffectwhichoccursneartheedgeandaboutahalfradius.Itisalsofoundthattheradialgradientofpressure,densityandtemperatureallbecomeverylargenearthecenterduetotheaxialshock.

简介：Manyfactorssuchasouterdiameter,hubratio,bladenumbers,shapeandstaggerangleaffecttheperformanceofsmallcoolingfans.AsmallcoolingfanwassimulatedusingCFDsoftwareforthreebladestaggerangles(30.5°,37.5°,44.5°)andobtainedtheinternalflowfieldandthestaticcharacteristics.Researchindicatedthatthestaggeranglehasanobviouseffectonthestaticcharacteristicsofafan.Forflowratesbelow0.0104m3/s,totalpressureisthegreatestwhenthestaggerangleis37.5°;flowrateshigherthan0.0104m3/s,thetotalpressureisgreatestwhenthestaggerangleis44.5°Forthesameflowrates,thevelocityatinletofpressuresurfaceincreaseswithincreasingstaggerangle,butthechangeofvelocityonthesuctionsurfaceisverysmall.Foronemodel,vorticesandthespeedofrevolutionsurfacesdecreasewithtipclearanceincreasing.Butforotherthreemodels,increasingthestaggerangle,thevortexintensityandspeedofrevolutionsurfacesatsameheighttipclearanceincreases,simultaneously,thepositionofvortexoffsetfromthetopoftherotorbladetothesuctionsurface.

简介：TheS2flowpathdesignmethodofthetransoniccompressorisusedtodesigntheonestagefaninordertoreplacetheoriginaldesignedbladecascadewhichhastwo-stagetransonicfanrotors.Inthemodificationdesign,thecamberlineisparameterizedbyaquarticpolynomialcurveandthethicknessdistributionofthebladeprofileiscontrolledbythedouble-thricepolynomial.Therefore,theinletflowhasbeenpre-compressedandthelocationandintensityoftheshockwaveatsupersonicareahavebeencontrolledinordertoletthenewbladeprofileshavebetteraerodynamicperformance.Thecomputationalresultsshowthatthenewsinglestagefanrotorincreasestheefficiencybytwopercentatthedesignconditionandthetotalpressureratioisslightlyhigherthanthatoftheoriginaldesign.Atthesametime,italsomeetsthemassflowrateandthegeometricalsizerequirementsforthemodificationdesign.

简介：Ageneralstudyofnon-staticrestrictedclassofaxialsystemwithanisotropicdissipativeexpansion-freefluidundergeodesicconditioniscarriedout.Itisfoundthatexpansion-freemodelmustbedissipativeundergeodesicconditiontopreserveaxialsymmetry.Wealsoinvestigatethissystemwithoutgeodesiccondition.Finally,theroleofdissipationisexploredviatransportequation.

简介：在最近的过去，试验性的研究证明了片的一些优点在轴的压缩机倾斜并且扫。当大多数试验性的结果与另外的特征被相结合，在压缩机的性能上决定单个参数的效果是困难的。现在的数字研究针对在出口理解表演和三维的流动模式扫并且未扫过的转子。三个转子也就是；未扫过，200向前扫了，200个向后打扫的转子与理解片边界层流动的模式的一个特定的意愿被分析。分析被做用一充分三维粘滞CFD代码CFX-5。结果在压力上升显示了减小与扫。向后扫根据endwalls附近的表演被考虑，是有害的。在在中间的跨度区域的wake的在另一方面全部的压力损失是更少与向后扫，它这里赞成它的应用程序。然而，向后不利地扫影响货摊边缘。能力向前扫偏斜向中心的streamlines变得以低流动率减少了。向前打扫变化吸表面优化的以如此的一个方法的streamline模式向中心被偏斜，压力表面优化向casing被偏斜。相反的行为在向后打扫的转子被观察。

简介：Opticalaxialscanningisessentialprocesstoobtain3Dinformationofbiologicalspecimens.Torealizeopticalaxialscanningwithoutmoving,thetunablelensisasolution.However,theconventionaltunablelensesusuallyinducenon-uniformmagnificationandresolutionissues.Inthispaper,wereportamovableelectrowettingoptofluidiclens.Unliketheconventionaltunablelens,ourproposedoptofluidiclenshastwoliquid-liquid(L-L)interfaces,whichcanmoveinthecellbyanexternalvoltage.TheobjectdistanceandimagedistanceareadjustedbyshiftingtheL-Linterfaceposition.Therefore,theproposedlenscanrealizeopticalaxialscanningwithuniformmagnificationandresolutioninmicroscopy.Toprovetheconcept,wefabricateanoptofluidiclensanduseitinopticalaxialscanning.Thescanningdistanceismorethan1mmwithuniformmagnificationandgoodimagingquality.Widespreadapplicationofsuchanewadaptivezoomlensisforeseeable.

简介：基于DCA机翼的一个原型和10%弦的轴的排水量重叠，七种正切的排水量被拿与数字方法在双人脚踏车串联模仿流动条件与高效选择更好的几何学。有正切的排水量b/t=0.83的配置将比其它获得更好的流动性能。在这个基础上，有正切的排水量b/t=0.67的二种配置并且0.83在几种配置之中被选择由使用TR-PIV系统即刻地捕获流动速度拿进试验性的调查。有b/t=0.83的配置被观察更好的流动地表演比b/t=0.67。它在差距地区的注射流动强壮得多，弄醒前面的地区区域并且高耸片更小，溪流流动是改进的更多。它证明在试验性的调查的流动表演相当在数字结果预言的一样的趋势。

简介：碳nanocones有相当迷人的电子、结构的性质，其轴的颤动很少在以前的研究被调查。在这份报纸，基于一个非局部的弹性理论，一个不一致的杆模型被使用在nanocones的轴的颤动上调查小规模的效果和不一致的效果。用修改Wentzel-Brillouin-Kramers(WBK)方法，一个asymptotic答案为一般不一致的nanorods的轴的颤动被获得。用类似的过程，然后，nanocones的轴的颤动为不一致的参数，模式数字和非局部的参数被分析。明确的表情为夹钳夹钳和夹钳免费的边界条件的模式频率被导出。因为对小长度规模的效果的无知，轴的颤动频率被古典杆模型高度过高估计，这被发现。

简介：Theimpactbucklingofalaminatedcompositebarisinvestigatedincaseofoneofitsendsmovingduetoaxialimpactcompression.Thegoverningequationsconsideringthefirst-ordersheardeformationeffectarederivedbytheHamiltonprincipleandsolvedbythefinitedifferencemethod.ThecriticalaxialshortnessisdeterminedbytheB-Rcirterion.Thegivenexampleisusedtohighlightthein-fluencesofinitialimperfection,impactvelocity,stresswaveandcoupledstiffness.Itisfoundthattheunsymmetricallylaminatedbarhasaquitedifferentdynamicbucklingbehaviourfromthatofthesymmetricallylaminatedbar.

简介：ThispaperestablishesthevelocityfieldandtheadequateshearstresscorrespondingtothemotionofanOldroyd-BfluidbetweentwoinfinitecoaxialcircularcylindersbymeansoffiniteHankeltransforms.Theflowofthefluidisproducedbytheinnercylinderwhichappliesatime-dependentlongitudinalshearstresstothefluid.Theexactanalyticalsolutions,presentedinseriesformintermsofBesselfunctions,satisfyallimposedinitialandboundaryconditions.ThegeneralsolutionscanbeeasilyspecializedtogivesimilarsolutionsforMaxwell,secondgradeandNewtonianfluidsperformingthesamemotion.Finally,somecharacteristicsofthemotionaswellastheinfluenceofthematerialparametersonthebehaviorofthefluidmotionaregraphicallyillustrated.

简介：Inthepresentpaper,atheoreticalmodelisproposedtoanalyzethetransientbehaviorofsuppressionofrotatingstallinaxialcompressionsystemsthroughtheuseofanadditionaldistubance,Thegoverningequationsofthemodelareasetofsimultaneousnonlinearfirstorderpartialdifferentialequations,andfornumericalcalculations,asimpleexplicittimemarchingmethodcanbeused.Theinfluenceofsystemparametersonthesuppressioneffectivenessandtheinteractionbetweenrotatingstallandsurgehavebeendiscussedinitially.TheanslysisoftheinfluenceofsystemparameterspresentsthatboththeBparameterandaxisymmetriccomprssorcharacteristichavesignificanteffectonthestabilizationeffectivenessofacontrolstrategy.TheeffectivenessdecreasesasthevalueofBandthenumberofstagesorstageloadingofthecompressorincrease,Ithasbeenfoundthattheonsetflowrateofrotatingstallandsurgeinacompressionsystemmaybedifferent,andthereisastronginteractionbetweenthesetwokindsofinstabilities.TheonsetflowrateofpureonedimensionalsurgedependsonthevalueofBandaxisymmetriccompressorcharacteristic,besidestheslopeofthecompressorcharacteristic.Insomecases,whenrotatingstallwhichisthenaturalmodeofinstabilityinacompressionsystemissuppressedonedimensionalsurgecanoccur,Itoftenlimitstheeffectivenessofacontrolstrategytosuppressrotatingstall.Butwhensurgeisintiatedbyratatingstall,itisalsopossibletoinhibittheoccurrenceofsurgebysuppressingrotatingstallinacompressionsystem.

简介：静态的特征，空气动力学的噪音和一把小轴的流动扇子的内部流动特征上的入口指南翼的效果在这个工作被学习。有不同插头角度的入口指南翼被设计，它在casing上被装并且定位了在原型扇子的impeller在上游。稳定、不稳定的流动模拟被执行。稳定的流动被海军司烧方程的计算模仿结合了RNGk-epsilon骚乱模型，当不稳定的流动与大旋涡模拟被计算时。根据理论分析，有60的插头角度的入口指南翼??坅？？

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简介：Toevaluatetheinfluenceofgasandliquidaxialmixingsontheseparationefficiencyofpackedcolumn,anapproximatemathematicalsolutionofHETP(equivalentheighttoatheoreticalplate)undercontinuousoperationhasbeenproposedbasedonthemixingpoolmodel.Themasstransferandhydrodynamicdataofstructuredpacking,Mellapak350Y,obtainedinahighpressuretowerhavebeenusedtotestthevalidityoftheproposedmodel.ComparedwiththeSRPmodelandtheGualitomodel,itisfoundthatforhighpressuredistillationprocessthepresentmathematicalpredictionshowsameanrelativeerrorofabout10%totheexperimentaldata,theaccuracyofwhichisthesameasthatbytheGualitomodelbutbetterthanthatbytheSRPmodel.

简介：TheasymmetricinletvelocityprofilehasbeenobservedinphantommodelusingLDAandinhealthsubjectsusingMagnetResonance(MR).TheeffectsofasymmetricinletaxialvelocityprofileontheflowfieldandtheWallShearStress(WSS)ofcarotidbifurcationwerenumericallystudiedhereinwiththeTF-AHCBmodel.TheresultsshowthattheWallShearStressGradient(WSSG)inthefrontpartofthesinusforinward-tiltinginletaxialvelocityprofileisnearly2timesofthatforthesymmetriconeinthebeginningofsystole,theendofsystole,anddiastole,respectively.TheareaofWSSbelow5×10-3Paattheouterwallofthesinusforoutward-tiltinginletaxialvelocityprofileis1.5timesofthatfortheinward-tiltingoneduringdiastoleofthecardiaccycle.Theasymmetricinletvelocityprofilescanreducetheflowvelocityneartheinnerwallofthesinus,whichhasbeennormallyconsideredahighvelocityregion.Itisconcludedthatbesidesbifurcationgeometryandflowwaveform,theasymmetryofinletvelocityprofileisprobablyafactorinfluencingatherosclerosis.

简介：Thenon-lineardynamicmodelissetupofonetypeofhigh-speedpaintingautomizorwithgassupportingsystem.Thestabilityofmotionanddynamicresponseofthegaspaintingautomizorsystemarestudiedoverarelativelywiderangeofrotatingspeedbynumericalanalyticmethod,thecriticalvelocityunderworkingconditionisfound,androtatestabilityandcriticalconditionarediscussedintheory.Furthermore,therangeofthecriticalparameterofthesystemwhenHopfbifurcationoccursandthelawbetweenaxistraceandbearingclearanceareacquired,too.

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简介：Themonophthalocyaninecomplexesofsamariumandterbiumcontainingaxial2-mercaptobenzothiazole(PcSm(MBT)(1)),2-(2-benzoxazol-2-yl)phenolate(PcTb(OON)(2))or2-(2-benzothiazol-2-yl)phenolate(PcTb(SON)(3))ligandsweresynthesizedandidentifiedbyelemental,LDI-TOFandX-ray(for1)analysis.Photoluminescence(PL)andelectroluminescence(EL)spectraofthecompoundscontainedonlyemissionbandsofphthalocyanineandaxialligandsbutdidnotcontainthebandsoff-ftransitions.Itwasfoundthatamongthecomplexes1,2,3thelatterhadhighestphotoconductivity(~10–7S/cm)andphotovoltaicproperties.Anorganicphotovoltaicdevice(OPV)ofconfigurationofITO/3/C60/Alq3/Alrevealedopen-circuitvoltage(VOC)of0.24Vandshortcurrentdensity(ISC)of0.3μA/cm2underilluminationbyaxenonlampat17mW/cm2.