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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：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：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?.

简介：Inadditiontodeploymentofthecommercialmanagementproducts,anumberofpublicandselfdevelopedtoolsaresuccessfullyusedatFermilabformonitoringofthecampusnetwork.Asuiteoftoolsconsistingofseveralprogramsrunninginadistributedenvironmenttomeasurenetworkparameterssuchasaverageround-triptime.traffic,throughput,errorrate,DNSresponsesandothersfromdifferentlocationsinthenetworkisused.Thesystemmaintainsacentralarchiveofdata,makesanalysisandgraphicalrepresentationavailableviaaweb-basedinterface.ThedevelopedtoolsarebasedonintegrationwithwellknownpublicsoftwareRRD,Cricketfping,iperf.

简介：在这篇论文，我们考虑在双线性的模型减小产生的一个概括Lyapunov方程的低等级近似答案。由使用变化原则，低等级近似答案问题被转变成一个非强迫的优化问题，然后我们使用非线性与准确的线搜索结合坡度方法解决相等的非强迫的优化问题。最后，一些数字例子被举说明建议方法的有效性。[从作者抽象]

简介：Thispapergivesanoverviewonnonlinearporousflowinlowpermeabilityporousmedia,revealsthemicroscopicmechanismsofflows,andclarifiespropertiesofporousflowfluids.Itshowsthat,deviatingfromDarcy’slinearlaw,theporousflowcharacteristicsobeyanonlinearlawinalow-permeabilityporousmedium,andtheviscosityoftheporousflowfluidandthepermeabilityvaluesofwaterandoilarenotconstants.Basedonthesecharacters,anewporousflowmodel,whichcanbetterdescribelowpermeabilityreservoir,isestablished.Thismodelcandescribevariouspatternsofporousflow,asDarcy’slinearlawdoes.Alltheparametersinvolvedinthemodel,havingdefinitephysicalmeanings,canbeobtaineddirectlyfromtheexperiments.

简介：最近，矩阵因式分解模型实质上在处理大规模等级最小化问题吸引增加的注意，它是一个nonconvex最小化问题。明确地，它是一个二次的最少的广场问题并且因而一个四次的多项式优化问题。在这份报纸，我们介绍SNIG的一个概念(“秒顺序必要optimality暗示全球optimality”)代表性质的状况矩阵因式分解模型的静止的点必须是的任何秒顺序全球minimizer。SNIG条件抓住在下面被介绍的一些情形。而且，当SNIG条件可以失败时，我们由一个例子说明。