简介：在垂直的泵的吸入附近的流动结构试验性地并且数字地被调查以便在设计垂直的泵，没有失去高效，他们的安装区域在被要求最小的吸入的最佳形状获得一个指南。我们作为泵的形状的一个代表性的特征在吸入的扩大比率上集中我们的注意并且在泵性能上调查扩大比率的效果。如果我们为泵的安装需要的区域应该是最小的考虑，最佳扩大比率在1.1锝?.2变化，这被结束如果我们为泵的安装需要的区域应该是最小的考虑。关键词垂直的泵-吸入的形状-在吸入CLC数字TK7附近的流动结构

简介：Theadiabaticelectrontransportistheoreticallystudiedinazigzaggraphenenanoribbon(ZGNR)junctionwithtwotime-dependentpumpingelectricfields.BymodelingaZGNRp–njunctionandapplyingtheKeldyshGreen’sfunctionmethod,wefindthatapumpedchargecurrentisflowinginthedeviceatazeroexternalbias,whichmainlycomesfromthephoton-assistedtunnelingprocessandthevalleyselectionruleinaneven-chainZGNRjunction.ThepumpedchargecurrentanditsONandOFFstatescanbeefficientlymodulatedbychangingthesystemparameterssuchasthepumpingfrequency,thepumpingphasedifference,andtheFermilevel.AferromagneticZGNRdeviceisalsostudiedtogenerateapurespincurrentandafullypolarizedspincurrentduetothecombinedspinpumpeffectandthevalleyvalveeffect.Ourfindingmightpavethewaytomanipulatethedegreeoffreedomofelectronsinagraphene-basedelectronicdevice.

简介：纸在操作条件的部分流动指光线的流动泵更弥漫的翼更少的行为。一些试验性的数据用2D/2CPIV和在内的不稳定的压力大小被获得了更弥漫，处于各种各样的操作条件。以更低的流动率的试验性的结果与二维的数字计算相比。

简介：基于海军司烧方程和Spalart-Allmaras骚乱模型，在有long-mid-short片建筑群impeller的离心的泵的三块维的狂暴的流动地数字地计算、分析。在flowpart的相对速度和压力分布被获得。在复杂impeller的经过的流动由于在涡囊和impeller之间的联合行动是不对称的，这被发现。逆流区域在长片的吸方面的入口，在长片的压力方面和短片的吸方面的插头的中间的部分附近。涡囊喉咙附近的流动被涡囊极大地影响。相对速度大，在涡囊喉咙附近在复杂impeller的插头带回来流动是容易的。静电干扰和全部的压力在impeller从入口一致地升起到插头。在impeller插头，压力周期性地严厉地从压力方面减少到吸方面，然后静态的压力喉咙附近的上升。试验性的结果证明在impeller的背流动在泵的表演上有重要影响。

简介：热泵周期广泛地为他们的高效率被用于干衣机。然而，自从一个标准热泵周期不能在低温度操作，电的加热器经常是的lowefficiency在早为冻结的食物或冬季弄干舞台期间使用了。这研究介绍了代替电的加热器在低温度改进干衣机性能的串联热泵。实验被执行在与周围的温度，低阶段的周期团流动率，和高阶段的周期团流动的关系在串联热泵干衣机的性能检验变化率。结果与串联热泵周期的介绍在低温度的干衣机性能显示出重要改进。

简介：AstablewavelengthoperationHo:YAGlaserdual-pumpedbytwoorthogonallypolarizedTm:YLFlasersisreported.Underthecwoperationmode,alaseroutputpowerof24Wismeasured.Thecorrespondingopticalopticalconversionefficiencyis44.75%andtheslopeefficiencyis50.12%.UndertheQ-switchedoperationmode,theoutputmaximumaveragepoweris22.8Watthere-frequencyof6kHz.Thecorrespondingoptical-opticalconversionefficiencyandslopeefficiencyare42.64%and48.01%,respectively.Theoutputcentralwavelengthis2090.73nm,thelinewidthis0.40nm,andthebeamqualityisM~2<1.6.Moreover,theshiftoftheoutputcentralwavelengthislessthan0.01nm,andthelinewidthshiftisalsolessthan0.01nm.

简介：Understandingtheradiationmodelofaflashlampisessentialforthereflectordesignofalaseramplifier.Reflectordesignofteninvolvesseveralsimplifyingassumptions,likeapointorLambertiansource;eitheroftheseassumptionsmayleadtosignificanterrorsintheoutputdistribution.Inpractice,sourcenon-idealitiesusuallyresultinsacrificingtheamplifier’sgaincoefficient.Weproposeanoveltesttechniqueforattainingthexenonflashlampabsolutespectralintensityatvariousanglesofview,andthenaccuratelypredictradiationdistributionsandgeneratethereflectorshape.Itisshownthatduetotheabsorptionofemittedradiationbythelampitself,thebehavioroftheradiationmodelatvariouswavelengthsisdifferent.Numericalresultsofxenonplasmaabsorptioncoefficientwerecomparedwiththemeasureddata.Areasonableagreementwasobtainedfortheabsorptioncoefficientparameters.Thus,thisworkprovidesausefulanalyticaltoolfortheengineeringdesignoflaseramplifierreflectorsusingxenonflashlampsaspumps.

简介：针对大面积高能激光束时空分布参数测量的需要,综合研究了量热和光电法测量激光束光强时空分布技术,采用现场实时定标方法有效地解决了两类数据融合问题,完成了量热光电复合式激光光强分布测量系统的研制.该系统主要由256路量热探测单元、120路光电探测单元、多通道数据采集模块和数据分析处理模块等部分组成.系统具有绝对激光能量测量准确、时间测量分辨率高的优点,实现了大面积高能激光束光强时空分布的准确测量.

简介：Duetotheexistenceofspatialwalk-offand/orgroup-velocitymismatcheffects,pump-to-signalphasetransferbecomesinevitableduringparametricamplification.Weexperimentallydemonstratethatinhybridseededopticalparametricamplifiers(OPAs)thatincludetwoOPAstagesseededbythesignalandidlerwaves,respectively,thephaseoftheoutputsignalcanberestoredtoitsinitialvalue,althoughtherearespatialandtemporalphasefluctuationsonthepumpsource.Thismethodsignificantlyrelaxestherequirementforhighpumpbeamquality,whichisalwaysverystringentinparametricamplificationsystems.Withtheintroductionofthisschemeintobirefringentphase-matchingOPAsorchirped-pulseOPAs,itshouldbepromisingtoachieveintensefemtosecondlaserpulsesthatareclosetothediffractionlimitinspaceandultra-highcontrastintime,simultaneously.

简介：TheHL-2ANBIdesignparametersarehydrogenbeamenergy60keY,thepulsedurationof2s,consistoftwobeamlinesandinjectedalongtangentialdirection.Theneutralbeampowerwillarrive4MWinthefuture.Thefirststepisonebeamlineandtwoionsources.Thevacuumvesselconsistsofmajorchamber,minorchamberandionsourcechamberanddriftduct.Weneedavacuumsystem,whichcapacityissufficientandtherelativelylowcostsofit.

简介：Theviscouspump,whichhasarotorwithahelicalsquarechannel,isstudiedexperimentally.Thenon-dimen-sionalchannelcurvatureistakentobeabout0.1.Threetypesoftorsionofthechannelaremadetoinvestigatethetorsioneffectontheflowcharacteristics.Wemeasurethefluxthroughthechannelataconstantrotorspeedbychangingthepressuresattheentranceandexitofthepump.Wealsoobservethesecondaryflowatacross-sectionofthechannel.Someoftheresultsobtainedareshownasfollows:Thefrictionfactoralongthechanneltogetthesamefluxislargeforlargechanneltorsionataconstantrotation,andbecomessmallwhenthefavorablerotationoftherotortotheflowisapplied.Asforthesecondaryflowinacross-section,thereappearseveraltypesofvortex.Whenthereisnorotation,thesecondaryflowisalmostasymmetrictwo-vortextypeforsmallfluxasistheordinaryDeanvortex,butitchangestoafour-vortextypewhenthefluxislarge.Thesecondaryflowbecomesasymmetricastherotationisapplied.Wehaveunsteadyflowpatternsatlargefluxandrotation.

简介：Pump-probedifferentialreflectionandtransmissionspectroscopyisaveryeffectivetooltostudythenonequilibriumcarrierdynamicsofgraphene.Thereportedsignofdifferentialreflectionfromgrapheneisnotexplicitlyexplainedandnotconsistent.Here,westudythedifferentialreflectionandtransmissionsignalsofgrapheneonadielectricsubstrate.Theresultsrevealthesignofdifferentialreflectionchangeswiththeincidentdirectionoftheprobebeamwithrespecttothesubstrate.Theobtainedtheorycanbeappliedtopredictthedifferentialsignalsofothertwo-dimensionalmaterialsplacedonvariousdielectricsubstrates.

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：

简介：有比100mm小的一条直径的微型涡轮泵在许多地里被采用；汽车散热器泵，室帮助泵，为电的设备的冷却的泵，洗衣机泵等等。进一步，对微型涡轮泵的需要将为电的机器随它的申请的增加变得更大。微型涡轮泵设计由于限制是尽可能简单的做精确制造，是合乎需要的。但是因为为这些小型的液体机械的内部流动条件没被澄清，常规理论不为小型的泵是传导性的，为微型涡轮泵的设计方法没被建立。有不同插头角度的转子的三种类型为一个实验和数字分析作好准备。表演测试与这些转子被进行以便在性能和微型涡轮泵的内部流动状况上调查片插头角度的效果。它从到更大的流动的那头微型涡轮泵增加和最大的效率流动率移动根据片插头角度的增加评估的试验性的结果被澄清，然而，最大的效率随它的增加减少。在现在的纸，微型涡轮泵的表演被显示出，内部流动条件与实验和数字流动分析的结果被澄清。而且，表演上的片插头角度的效果被调查，有为微型涡轮泵的简单结构的高效设计将被考虑。

简介：Usingcryogeniclasertechnology,itisnowpossibletodesignanddemonstratelasersthathaveconcomitanthighaverageandpeakpowers,withnear-diffraction-limitedbeamquality.WerefertothesenewlasersystemsasHAPPlasers.Inthispaper,wereviewimportantlasercrystalmaterialspropertiesatcryogenictemperature,withanemphasisonYblasers,anddiscusstheimportantdesignconsiderations,includingthelaser-induceddamagethreshold,nonlineareffectsandthermaleffects.Acomprehensivemodelispresentedtodescribediodepulsedpumpingwitharbitrarydurationandrepetitionrate,andisusedwiththeFrantz–Nodvikequationtodescribe,tofirstorder,theperformanceofHAPPlasersystems.Acomputercodewithrepresentativeresultsisalsodescribed.

简介：Thispapertreatstheflowinstabilitiesinamixedflowpumpwithavaneddiffuser.Testpumphasapositiveslopeofahead-flowperformancecurveat65%flowrateofBEP(BestEfficiencyPoint)becauseofarotatingstall.DynamicParticleImageVelocimetry(PIV)andpressurefluctuationmeasurementsareusedforinvestigatingthepropagationmechanismofarotatingstall.Itwasfoundthatunstableperformancewascausedbyperiodicallargescaleabruptbackflowgeneratedfromthevaneddiffusertotheoutletofimpeller.Further,therelationbetweenthestaticpressureattheinletofdiffuservaneandtheinternalflowconditionwasclarified.Fromtheseexperimentalresults,inordertoimprovethepositiveslopeofahead-flowperformancecurve,tosuppressthegrowthofstrongvortextowardtheinletofdiffuservanewasprovedtobeakeypoint.

简介：散布的刺激Brillouin(SBS)的表演用一条新奇幽灵似地切的宽带基于慢光支离破碎的泵来源数字地被学习。泵力量光谱的侧面被极化的宽带跟随的光过滤器的传播系列决定支离破碎的泵来源。我们也调查为2.5Gbit/sreturn-to-zero脉搏(50%责任周期)在不同幽灵似地切的带宽和泵力量层次下面过滤的Gaussian类型和super-Gaussian-type的表演。拓宽的脉搏被半最大值(FWHM)的完整的宽度和rms脉搏宽度分别地描绘。然而，二种测量方法获得的结果与增加泵力量从对方背离。与过滤的常规Gaussian类型相比，拓宽的脉搏能显著地用在延期时间以小减小的成本过滤的super-Gaussian-type被减少。而且，在脉搏拓宽BFWHM=的最大的改进28.4%并且BRMS=10.4%被使用一个五顺序的super-Gaussian-type过滤器和500mW的泵力量完成。

简介：为了在impellers压制成穴并且做涡轮泵，更长生活，inducer与主要impeller被分开，两impellers独立地被驾驶。在impellers附近的泵和流动条件的表演试验性地被调查，下列结果被获得。(1)主要impeller贡献在inducer和主要impeller之间的流动相互作用。(2)两impellers的旋转速度能独立地被控制以便同时总体上压制成穴不仅impeller，而且在inducer。

简介：Asahighspecificspeedpump,thecontra-rotatingaxialflowpumpdistinguishesitselfinarearrotorrotatingintheoppositedirectionofthefrontrotor,whichremarkablycontributestotheenergyconversion,thereductionofthepumpsize,betterhydraulicandcavitationperformances.However,withtworotorsrotatingreversely,thesignificantinteractionbetweenbladerowswasobservedinourprototypecontra-rotatingrotors,whichhighlyaffectedthepumpperformancecomparedwiththeconventionalaxialflowpumps.Consequently,anewtypeofrearrotorwasdesignedbytherotationalspeedoptimizationmethodologywithsomeadditionalconsiderations,aimingatbettercavitationperformance,thereductionofbladerowsinteractionandthesecondaryflowsuppression.Thenewrearrotorshowedasatisfactoryperformanceatthedesignflowratebutanunfavorablepositiveslopeofthehead-flowratecurveinthepartialflowraterangelessthan40%ofthedesignflowrate,whichshouldbeavoidedforthereliabilityofpump-pipesystems.Inthepresentresearch,tounderstandtheinternalflowfieldofnewrearrotoranditsrelationtotheperformancesatthepartialflowrates,thevelocitydistributionsattheinletsandoutletsoftherotorsarefirstlyinvestigated.Then,theboundarylayerflowsonrotorsurfaces,whichclearlyreflectthesecondaryflowinsidetherotors,areanalyzedthroughthelimitingstreamlineobservationsusingthemulti-coloroil-filmmethod.Finally,theunsteadynumericalsimulationsarecarriedouttounderstandthecomplicatedinternalflowstructuresintherotors.