简介：有高精力的波长悦耳的超短波的脉搏来源高度为很多应用被需要。波长悦耳的all-normal-dispersion(ANDi)锁模式的纤维激光，能容易被压缩并且由所有纤维结构放大了，是有紧缩的结构的如此的来源的一粒有希望的种子。在不同中心波长的脉搏压缩和扩大(从1026～1058nm)悦耳的ANDiYbdoped锁模式的纤维，我们以前建议了的激光试验性地在这个工作被调查。它被发现那，为不同波长，持续时间并且从振荡器直接产量脉搏啁啾然而，更加变化压缩脉搏的持续时间少些波动。为扩大过程，由于做Yb的纤维的unflat获得光谱，在短波长的获得在长波长比那大。因而，扩大过程导致的光谱失真的趋势为不同波长是不同的。这些结果和分析将基于一粒ANDi种子对高精力、波长悦耳的超短波的脉搏来源的设计有用。

简介：TheconceptofusingbladeslottingtosuppressthelargeboundarylayerseparationofhighaerodynamicloadinglowpressureturbineprofilehasbeendevelopedinPart1.Calculatedresultshighlighttheinabilityperformanceaccompaniedwithun-properbladeslottingathighReynoldsnumber,bladeslottingoptimizationseemslikecompulsory.Meanwhile,tofurtherdignifytherationalforuseofbladeslotting,slottingpositionanditsgeometryneededtobeoptimized.Comparisonofdifferentslottingschemecalculationresultspromisedthatbladeslottingparameterlikeoutletangleandoutletpositionarethemostimportantparameterswhichmustbeinvestigatedtosatisfythedesignpurpose.

简介：ThestructureandhydridingperformanceofLa0.6Nd0.4Ni4.8Mn0.2Cux(x=0～0.4)alloyswereinvestigatedinordertodevelopsuitablematerialsformetalhydrideairconditioner.TheeffectofCuadditiononthecrystalstructure,equilibriumpressure,hydrogencapacityandhysteresisaswellashydrogenabsorption/desorptionkineticsweresystematicallystudiedbyusingthemeasurementofP-Cisotherms,X-raydiffractionandscanningelectronmicroscopy.AstheamountofCuincreases,theplateaupressureincreasesandhydrogenabsorption/desorptionkineticsisimproved,buttheeffectivehydrogenstoragecapacitydecreases.Itisshownthatvariationsinthebasalplaneparameteracanbeusedasanindicationfortheplateaupressurechanges.Withtheincreaseofparametera,theplateaupressuredecreases.ForLa0.6Nd0.4Ni4.8Mn0.2Cux(x=0～0.4)alloysthereisarelationshipbetweentheeffectivehydrogenstoragecapacitiesandtheratiosoftheirunitcellparameterscanda.Theeffectivehydrogenstoragecapacitydecreaseswithincreaseofa/c.

简介：ThisarticleaddressesthesynthesisoforganicallytailoredNi-Allayereddoublehydroxide(ONi-AlLDH)anditsuseinthefabricationofexfoliatedpoly(methylmethacrylate)(PMMA)nanocomposites.ThepristineNi-AlLDHwasinitiallysynthesizedbyco-precipitationmethodandsubsequentlymodifiedusingsodiumdodecylsulfatetoobtainONi-AlLDH.NanocompositesofPMMAcontainingvariousamountsofmodifiedNi-AlLDH(3wt%?7wt%)weresynthesizedviasolventblendingmethodtoinvestigatetheinfluenceofLDHcontentonthepropertiesofPMMAmatrix.SeveralcharacterizationmethodssuchasX-raydiffraction(XRD),transmissionelectronmicroscopy(TEM),Fouriertransforminfraredspectroscopy(FTIR),rheologicalanalysis,differentialscanningcalorimetry(DSC)andthermogravimetricanalysis(TGA),wereemployedtoexaminethestructural,viscoelasticandthermalpropertiesofPMMA/OLDHnanocomposites.TheresultsofXRDandTEMexaminationconfirmtheformationofpartiallyexfoliatedPMMA/OLDHnanocomposites.TheFTIRresultselucidatethatthecharacteristicbandsforbothpurePMMAandmodifiedLDHarepresentinthespectraofPMMA/OLDHnanocomposites.Rheologicalanalyseswerecarriedouttoexaminetheadhesionbetweenpolymermatrixandfillerspresentinthenanocompositesample.TheTGAdataindicatethatthePMMAnanocompositesexhibithigherthermalstabilitywhencomparedtopurePMMA.ThethermaldecompositiontemperatureofPMMA/OLDHnanocompositesincreasesby28KcomparedtothatofpurePMMAat15%weightlossasapointofreference.IncomparisonwithpurePMMA,thePMMAnanocompositecontaining7wt%LDHdemonstratesimprovedglasstransitiontemperature(Tg)ofaround3K.Theactivationenergy(Ea),reactionorders(n)andreactionmechanismofthermaldegradationofPMMA/OLDHnanocompositeswereevaluatedusingdifferentkineticmodels.WateruptakecapacityofthePMMA/OLDHnanocompositesislessthanthatofthepurePMMA.

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简介：TheagingbehaviorofAl-Cu-Mg-AgalloyswithhighCu/Mgwasstudiedbytransmissionelectronmicroscopy(TEM)andsmall-angleX-rayscattering(SAXS)usingsynchrotronradiation.TEMstudyrevealsthatthemajorstrengtheningphasesofthealloyafteragingat160?Cfor10hareΩandlessθ′.SAXSstudyshowsthatthescatteringpatternsarecomposedofseveralconcentriccirclesatthebeginningofagingprocess,whichisreplacedbythebutterfly-wingsscatteringpatternswiththeincreaseofagingtime...

简介：Objectives:TocharacterizethedistributionpatternofbiovarsandserotypesofUreaplasmaurealyticuminnormalhealthywomen,sexuallytransmittedinfectionsclinicclientsandinsexworkers.Methods:Weculturedcervicalswabstakenfrom261physicalcheck-upclients,599STIclinicoutpatientsand98sexworkersusingcommercialselectivemedium.SomepositivecultureswerefurtherbiotypedandserotypedbyPCR.Results:(1)Biovar1ofU.urealyticum(95.0%),especiallysingleinfectionofserotype1,3,and6ofbiovar1,iscommonlyfoundinhealthywomen.(2)Uourealyticumismorecommonlyisolatedinsexworkers(90.8%)thaninphysicalcheck-upgroup(60.9%)andSTIoutpatientsgroup(61.3%)(P<0.001).(3)Biovar2infectionofU.urealyticumismoreprevalentinsexworkers(28.1%)andSTIoutpatientsgroup(26.6%)thanthatinphysicalcheck-upgroup(4.9%)(P<0.001).(4)MixedinfectioncausedbymorethanoneserotypeofU.urealyticumisincreasingfromphysicalcheck-upgroup(8.6%)toSTIoutpatients(12.4%)andtosexworkers(23.9%)(P<0.01).(5)Thereisnostatisticdifferenceinthedistributionofserotype1,3,and6ofbiovar1amongthesethreegroups(P=0.763).(6)ThePCRmethoddescribedhereisrelativelysimple,rapidandspecificforthebiotypingandserotypingofbiovar1ofU.urealyticum.Conclusion:weshouldpaymoreattentiontobiovar2andmixedinfectionthansingleinfectionofbiovar1ofU.urealyticuminclinicpractice.PCRisagoodmethodinbiotypingandserotyping.

简介：Boundarylayerseparationandreattachmentisoftenanunavoidablefeatureoflowpressure(LP)turbine,oneofthemaincausesofthisphenomenonisthehighaltitudelowReynoldsnumberexperiencedbythemodernLPturbinestageinaero-engine.Althoughanexcellentturbineairfoildesigncanavoidflowseparationoncertainextent,butwithinflightenvelope,LPturbine'scharacteristicReynoldsnumbermayvariedgreatly,soitwillbestillundertheriskofthepresenceofseparationbubble.Inthistwopartspaperanewconceptofslotted-bladewasraisedtotestifythegainofthebladeslotting.AhighaerodynamicloadingLPturbinebladeIET-LPTAwasunderinvestigatedwithdifferentReynoldsnumber.ComputationalresultsrevealthatthebladeslottingcouldbeawayofchoicetosuppressseparationbubbleandreduceprofilelossundertheconditionoflowReynoldsnumber,althoughitspositionandgeometryneedtobefurtherinvestigated.

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简介：在答案的膜蛋白质的结构在水晶阶段与那不同。我们在场小角度X光散布的主要结果(萨克斯风管)解决了第一次在净化的答案从光合的bacteriaRhodopseudomonasacidophile收获天线膜蛋白质建筑群LH2的一盏灯的拓扑的结构。我们在答案的LH2建筑群的椭圆的形状清楚地在水晶阶段从它的圆形的结构背离的结果表演由X光衍射决定了。这结果在LH2提供卓见进结构和功能相互影响。

简介：摘要：某核电厂日常期间出现安全注入系统泵的中压电机冷却器泄露的异常，该电机所对应的这一列安注系统不可用，将会降低核安全冗余度，同时影响电厂发电能力，需要第一时间排查故障模式，锁定故障原因，并制定应对措施，以确保核电机组的安全稳定运行。

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简介：[摘要] 笔者在前人研究的基础上总结概括出了影响学生英语听力的因素，并以三大听力策略——认知策略、元认知策略和情感策略为理论，在将抽象理论具体化的基础上提出了一个循序渐进提高高中生英语听力能力的策略，从而对高中课上英语听力训练提出一个建议性计划，与大家一起切磋。

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