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297 个结果
  • 简介:这篇论文在为一把新奇错流扇子与一个噪音实验获得的远地里借助于数字方法和健全压力调查在来源的波动的压力和速度之间的关系。在一把错流扇子的波动的压力和速度的频率特征被分析借助于光谱分析和小浪变换。大旋涡模拟在套墙上获得的波动的压力与实验的相比并且显示出好同意。从光谱健全来源的分析,波动的压力达到顶点,这被发现在远地里与健全压力相应。

  • 标签: 鼓风机 压力 速度 空气动力学
  • 简介:Whenweareoperatinglowtemperatureplasmaindustrialgeneratororexploitinglowtemperatureplasmaapplication,wehavealwaysobservedanenhanceddischargephenomenon.Suchas,whenweareworkingonplasmanitridingtreatmenttosteelworking

  • 标签: 低温等离子体 DC发光放电 空心阴极 渗氮处理
  • 简介:在在精力的反应关上到库仑障碍的multinucleon转移的主要进步被考察。在试验性的进步和理论进步的一个短演讲以后,为未知充满中子的重原子核和trans铀原子核的预言的生产十字节被介绍。

  • 标签: 转移反应 原子核 生产 情调 试验性 十字节
  • 简介:Thestationarycorrelationfunctionandtheassociatedrelaxationtimeforageneralsystemdrivenbycrosscorrelatedwhitenoisesarederived,byvirtueofaStratonovich-likeansatz.Theeffectsofcorrelatednoisesontherelaxationtimeofabistablekineticmodelcoupledtoanadditiveandamultiplicativewhitenoisesarestudied.ItisprovedthatforsmallfluctuationstherelaxationtimeTcasafunctionofλ(thecorrelatedintensitybetweennoises)exhibitsverydifferentbehavioursforαD(αandD,respectively,standfortheintensitiesofadditiveandmultiplicativenoises).Whenα>D,Tcincreaseswithincreasingλ.Butwhenα

  • 标签: 双稳态动力系统 弛豫时间 相关噪声 稳态相关函数
  • 简介:ppΛ→pK~+Λ的反应。是一条很好的隧道通过他们的KΛ腐烂模式学习N~*回声,因为没有混合isospin我=1/2并且我=3/2due到isospin保存。在这个工作,我们扩大一个回声模型,它能复制全部的生气的节很好,到提议这反应的微分生气的节信息。它能用作一本参考书在Lanzhou更凉爽的存储戒指(CSR)造安排强子察觉者。在未来的这些微分生气的节的实验测量将供应我们模型和帮助上的更多的限制我们更好理解奇妙生产动力学。

  • 标签: 谐振模型 PP碰撞 理论物理 交叉段
  • 简介:Waveguidesuperlattices,aspecialtypeofwaveguidearrays,canbedesignedtoachieveverylowcrosstalkatsubmicrometer/subwavelengthpitches.Thetheoreticalframeworkanddesignrationalesforsuchwaveguidesuperlatticeswillbepresentedindepth.Waveguidesidewallroughnesscanhelptodeterthecoherentcouplingbetweenidenticalwaveguidesinnearbysupercells,butitalsoinducesrandomfluctuationoftransmission.Statisticalbehaviorofthetransmissionduetoroughnessinawaveguidesuperlatticeissystematicallytreated.Complextransmissioncharacteristicsduetospectraloscillationandrandomroughnesswillbepresented,andtheirevolutionwiththesuperlatticelengthwillbeanalyzed.

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  • 简介:Experimentswereconductedtoinvestigatetheeffectofimpellergeometryandtongueshapeontheflowfieldofcrossflowfans.Threeimpellers(Ⅰ,Ⅱ,Ⅲ)havingsameouterdiameter,butdifferentradiusratioandbladeangleswereemployedfortheinvestigation.Eachimpellerwastestedwithtwotongueshapes.Flowsurveywascarriedoutforeachimpellerandtongueshapeattwoflowcoefficients.andforeachflowcoefficientatdifferentcircumferentialpositions.Theflowistwo-dimensionalalongthebladespanexceptneartheshrouds.Thetotalpressuredevelopedbytheimpellersineachcaseisfoundtobemaximumatacircumferentialpositionofaround270°.Thetotalandstaticpressuresattheinletofimpellersaremoreorlesssameregardlessofimpellerandtonguegeometry,buttheyvaryconsiderablyatexitoftheimpellers.ImpellerⅢwithtongueT2developshighertotalpressureandefficiencywhereasimpellerⅡwithtongueT2developsminimumtotalpressure.HigherdiffusionandsmallervortexsizearethereasonsforbetterperformanceofimpellerⅢwithtongueT2。

  • 标签: 流动系数 圆周位置 偏心涡流 总压系数 静压系数 涡轮机
  • 简介:Weproposeathree-partyschemeforquantuminformationsplitting(QIS)ofanarbitrarysingle-photonpolarizationstatebasedonweakcross-Kerrnonlinearitycombinedwithlinearopticselementssuchaspolarizationbeamsplitters(PBSs)andhalfwaveplates(HWPs).Theschemeisgeneralizedtothearbitrary-partycase.Withthehelpofquantumnondemolition(QND)measurements,ourschemescanbeaccomplishedinanalmostdeterministicway.Thetwoschemesarefeasiblewiththecurrenttechnology.

  • 标签: QUANTUM information SPLITTING cross-Kerr NONLINEARITY QUANTUM
  • 简介:Theadditivityruleforelectron-moleculescatteringisrevisedbyconsideringthedifferencebetweenthefreeatomandtheboundatominthemolecule.Thetotalcrosssectionsforelectronscatteringfromfluoromethanes(CF4,CF3H,CF2H2,andCFH3)arecalculatedinanenergyrangefrom100eVto1500eVbytherevisedadditivityrule.Thepresentcalculationsarecomparedwiththeoriginaladditivityruleresultsandtheavailableexperimentaldata.Betteragreementwitheachotherisobtained.

  • 标签: 可加性规则 电子散射 分子散射 氟代甲烷 修订 总截面
  • 简介:Cryosurgeryisaneffectivewayofcuringmanydiseasesincludingtumorsandcancers.Itcanbeappliedusingavarietyofsystemsandcryogens.Cheap,convenient,reliableequipmentstillneedstobedevelopedsothatcryotherapymaybeacceptedbysurgeonsandhospitals.Thispaperpresentsacryosurgeryapparatusthatutilizesanauto-cascaderefrigerationsystem.RefrigerantmixtureR50/R23/R600awasselectedastheworkingfluid.Themixturecompositionwasalteredtoachievelowertemperaturesandhighercapacity.Thelowesttemperatureatthecryoprobecouldbeaslowas-100°C,and8Wrefrigerationcapacitycouldbeobtainedat-80°C.Aniceballof11.6mmdiametercouldbeformedwhenthecryoprobewasimmersedinawaterbathat37°C.

  • 标签: 冷冻设备 实验 冷冻治疗 混合制冷剂 多种系统 制冷系统
  • 简介:DiamondfromLiaoning,Chinawasstudiedbysynchrotronradiationandinfraredspectrum.Thedistributionofdislocationsinthespecimenthasbeenrevealed.Anewmethodtodeterminetheorientationofcrystaldefectshasbeenproposedandtheorientationindexesofthedislocationsinthespecimenwerecalculatedbythismethod.Ithasbeenfoundthatthedislocationsinthespecimentarenearbutnotpreciselyparallelto{111}planes,Themaximumanglebetweendislocationand{111}planeisabout16°.AlmostallthedislocationsinthespecimenthavethesameBurgersvector1/2[101]andimplythesamenessoftheirorigination.

  • 标签: 天然金刚石 缺陷 位错 X射线
  • 简介:Toestablishthemechanismofsurfacechangeinacontinuouspolishingsystem,anidealmathematicalmodelisbuiltbasedonWinkler’shypothesisandthePrestonequation.Thebasicfeaturesofthemodelarethechangeratesinthesurfacepeak–valley(PV)valuesoftheworkpiece,conditioningdiskandpitchlap,ratherthanthespecificsurfaceshapes.Inaddition,anequilibriumstateexistsinthesystem,indicatingthatthesurfacechangeratesareallzero.Underequilibrium,thesurfaceofthelapcouldremainflat,anditisinsensitivetothesurfaceerroroftheworkpiece.Thesecharacteristicslaythetheoreticalfoundationsforhigh-efficiencyandhigh-precisionpolishing.Themethodstoobtainanequilibriumstatewithflatsurfacesarethenproposedandconfirmedexperimentally.High-precisionsurfacesbetterthanλ/10(λ=632.8nm)areconsistentlyproducedexperimentally.

  • 标签: CONTINUOUS POLISHING EQUILIBRIUM STATE HIGH accura
  • 简介:Weproposethespectrumallocationandresourceschedulingalgorithmsincognitivepointtomultipoint(PMP)networkswithrapidchangesofspectrumopportunitiesandpresentamediaaccesscontrol(MAC)protocolbasedonthesealgorithms.Theobjectiveofspectrumallocationistomakeefficientuseofthespectrumwhilemaintainingthetransceiversynchronizationonfrequencyandtimeinthenetwork.Theobjectiveofresourceschedulingistoguaranteethequalityofservice(QoS)requirementsofdifferentkindsofconnectionsandtominimizethetotalenergyconsumptioninthenetworkaswell.Bysensingonlyasmallsetofpossiblechannelsineachslotbasedonthestatetransitionprobabilityofeachchannel,ourspectrumallocationalgorithmachieveshighspectrumefficiencyinthenetwork.Theresourceschedulingproblemisdividedintothreesubproblemsandwederiveoptimalsolutionstotheseproblemsbygreedyalgorithmandconvexoptimization.Thesimulationresultsshowthatouralgorithmcanmakeefficientuseofthespectrumandthenetworkresourcesatacostoflowcomputationalcomplexity.

  • 标签: 数据通信 无线通信 光谱 最佳化设计
  • 简介:Fig.1showstheimpactparameter-averagedasymptoticvaluesofthenumberoftheemittedneutronsN_nandthenumberoftheemittedprotonsN_p(whenthevaluesofN_pandN_natt=200fm/cbecomenearlyconstants)i.e.b(topwindow)andb(bottomwindow)asafunctionofthebeamenergywithmomentumdependentintractionforthesystems~(76)Kr+~(40)Ca(leftwindows)and~(76)Kr+~(76)Kr(rightwindows)infivecases:

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