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简介：Thedeterminationofthesoundpowerofasourceissimpleinareverberationchamber,butusuallylowervalvesareobtainedatlowfrequenciesthanthefree-spacevalue.Itisshownthatthesoundpowerdeterminedinareverberationchamberdependsnotonlyonitsfree-spacepower,butalsoonthepositionsofthesourceandthereveiver,aswellasthewaythemeasurementsaremadeandaveraged.Exactandstatisticalformulasarederivedtoaccountforthesefactors.Theresultsexplainthediscrepancyandagreewellwithearlierexperiments.Basedonthetheory,parcticabletechniquesofsoundpowerdetermina-tionarepropesedandcorrectpowerformulaspresented.

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简介：Thereisatypeofnodalsurfaceimposedbysymmetryonwavefunctions.Thesesurfacesarecrucialtotheorderingoflow-lyingstates.Basedonananalysisofthistypeofsurfaceandbasedonexistingtheoreticalresults,thefeatureofthelow-lyingspectrumoftheHe-tetramerisstudied,andthecandidatesofboundstatesandnarrowresonancesaresuggested.

简介：左R-模M称为Eω-内射模,如果对环R中任意的ω阶Euclid理想I来说,任何R-模同态能够拓展为R-模同态。左R-模M称为Eω-投射模,若对环R中任意的ω阶Euclid理想I和任何R-模同态f∈HomR（M,R/I）,存在R-模同态g∈HomR（M,R）使得f=πg,其中π是自然同态。本文证明P和Q均是Eω-投射模当且仅当PQ是Eω-投射模。进而,又证明了每一个左R-模是Eω-投射的当且仅当每一个左R-模是Eω-内射。

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简介：Thispaperaimstogivesomeexamplesofdiffeomorphic(orhomeomorphic)lowdimensionalcompleteintersections,whichcanbeconsideredasageometricalrealizationofclassificationtheoremsaboutcompleteintersections.AconjectureofLibgoberandWood(1982)willbeconfirmedbyoneoftheexamples.

简介：Geant4LowEnergyElectromagneticpackageProvidesaprecisetreatmentofelectromagneticinterationsofparticleswithmatterdowntoverylowenergies(250oVforelectronsandphotons,<1keVforhadronsandions),Itincludesaverietyofmodelsfortheelectromagneticprocessesofelectrons,photons,hadronsandions,takingintoaccountadvancefeatures,suchasshelleffectsandeffectsduetochargedependence.Thecomprehensivesetofparticletypesitcanhandle,thevarietyofmodelingapproachesandtheextendedcoverageofenergyrangemakethispackageauniquetoolamongMonteCarlocodesonthemarket,andofrelevancetoserveralexperimentaldomainsinHIEP,astroparticlephysics,spacescienceandbiomedicalstudies.

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简介：以便讨论修改La的铅锆酸盐titanate锡酸盐antiferroelectric陶艺PbLaZr的非线性的机电的性质，Sn，TiO3PLZST，近似线性化的电致伸缩的方程古典线性压电的方程从秒顺序被导出的一模一样的形式概括压电的方程称为。解决非线性的antiferroelectric阶段转变陶艺变换器的电声的transduction问题的一条分析途径被介绍。PLZST的非线性的性质能基于为分析变换器的电声的transduction问题的近似线性化的电致伸缩的方程与维持的偏爱是线性地相等的。创新antiferroelectric陶艺有回声频率1.1kHz的低频率班IVflextensional变换器基于途径被开发它作为活跃元素利用PLZST。湖认证显示为变换器的PLZST的使用一会儿在它的PZT-4对应物上在在SL的TVR和9dB增加产出3dB增加，并且途径是有效的。

简介：本文在无穷维空间引入(E0，E)型渐近光滑映射的概念，研究了其基本性质和变为E中渐近光精映射的条件，我们证明了(E0，E)型吸引子存在性定理和(E0，E)型吸引子转化为E中吸引子的条件定理，所有结果都应用于一类耗散波方程新近性态的研究．

简介：最小的dilaton模型(MDM)由叫的dilaton和dilaton顶夸克搭挡把t'称为的一汗衫数量扩大标准模型。在这个工作，我们调查t'-induced放射的修正到Higgs-strahlung生产过程e+在未来Higgs的eZh工厂。我们首先详细介绍分析计算并且显示出怎么处理紫外分叉。然后，我们由从精确electroweak数据考虑限制数字地计算修正。我们发现那，为罪恶L=0.2并且mt'=1200GeV，修正是0.26%和2.1%为，1TeV分别地，并且更大的价值能作为罪恶L增加。

简介：CuO-CeO2catalystswerepreparedbyaureaprecipitationmethodfortheoxidativesteamreformingofethanolatlow-temperature.Thecatalyticperformancewasevaluatedandthecatalystswerecharacterizedbyinductivelycoupledplasmaatomicemissionspectroscopy,X-raydiffraction,temperature-programmedreduction,fieldemissionscanningelectronmicroscopyandthermo-gravimetricanalysis.OverCuOCeO2catalysts,H2withlowCOcontentwasproducedinthewholetestedtemperaturerangeof250–450C.Thenon-noblemetalcatalyst20CuCeshowedhigherH2productionratethan1%Rh/CeO2catalystat300–400Candtheadvantagewasmoreobviousafter20htestingat400C.TheseresultsfurtherconfirmedthatCuO-CeO2catalystsmaybesuitablecandidatesforlowtemperaturehydrogenproductionfromethanol.

简介：Heattransportisakeyenergeticprocessinmaterialsanddevices.Thereducedsamplesize,lowdimensionoftheproblemandtherichspectrumofmaterialimperfectionsintroducefruitfulphenomenaatnanoscale.Inthisreview,wesummarizerecentprogressesintheunderstandingofheattransportprocessinlow-dimensionalmaterials,withfocusontherolesofdefects,disorder,interfaces,andthequantummechanicaleffect.Newphysicsuncoveredfromcomputationalsimulations,experimentalstudies,andpredictablemodelswillbereviewed,followedbyaperspectiveonopenchallenges.

简介：Duetotheupcomingdemandsofnext-generationelectronic/magnetoelectronicdeviceswithlow-energyconsumption,emergingcorrelatedmaterials(suchassuperconductors,topologicalinsulatorsandmanganites)areoneofthehighlypromisingcandidatesfortheapplications.Forthepastdecades,manganiteshaveattractedgreatinterestduetothecolossalmagnetoresistanceeffect,charge-spin-orbitalordering,andelectronicphaseseparation.However,theincapableofdeterministiccontrolofthoseemerginglow-dimensionalspinstructuresatambientconditionrestricttheirpossibleapplications.Therefore,theunderstandingandcontrolofthedynamicbehaviorsofspinorderparametersatnanoscaleinmanganitesunderexternalstimuliwithlowenergyconsumption,especiallyatroomtemperatureishighlydesired.Inthisreview,wecollectedrecentmajorprogressesofnanoscalecontrolofspinstructuresinmanganitesatlowdimension,especiallyfocusingonthecontroloftheirphaseboundaries,domainwallsaswellasthetopologicalspinstructures(e.g.,skyrmions).Inaddition,capacitor-basedprototypespintronicdevicesareproposedbytakingadvantageoftheabovecontrolmethodsinmanganites.Thiscapacitor-basedstructuremayprovideanewplatformforthedesignoffuturespintronicdeviceswithlow-energyconsumption.

简介：在低频率改正测量头相关的转移功能(HRTF)的一个方法被建议。由在低频率从球形的头模型分析HRTF，在400Hz的频率下面，HRTF的大小是将近不变的，阶段为远、近的地两个都是频率的线性功能，这被证明。因此，如果在400Hz上面的HRTF被实验精确地测量，它能由理论模型在低频率改正HRTF。计算和主观实验的结果证明建议方法的可行性。

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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：ForthesuccessofPAL-XFEL,twocriticalsystems,namelyalowemittanceinjectorandavariablegapout-vacuumundulator,areunderdevelopment.InordertorealizethetargetemittanceofthePAL-XFELinjectorwecarriedoutanoptimizationstudyofvariousparameters,suchasthelaserbeamtransverseprofile,thelaserpulselength,thelaserphase,andthegunenergy.ThetransverseemittancemeasuredattheInjectorTestFacility(ITF)isεx=0.48±0.01mmmrad.AnundulatorprototypebasedontheEU-XFELdesignandmodifiedforPAL-XFELwasbuiltandtested.Alocal-Kpoletuningprocedurewasdevelopedandtested.Asignificantreduction(90%)ofthelocal-Kfluctuationwasobserved.Therequirementofundulatorfieldreproducibilitybetterthan2×10-4andtheundulatorgapsettingaccuracybelow1μmwereachievedfortheprototype.Theopticalphasejitterafterthepoleheighttuningatthetuninggapwascalculatedtobe2.6?rms,whichsatisfiestherequirementof5.0?.