简介：Adiode-pumpedalkalilaser(DPAL)providesthesignificantpromiseforhigh-poweredperformances.Inthispaper,amathematicalmodelisintroducedforexaminationofthekineticprocessesofadiode-pumpedcesiumvaporhollow-corephotonic-crystalfiber(HC-PCF)laser,inwhichthecesiumvaporisfilledinthecenterholeofaphotonic-bandgapfiberinsteadofaglasscell.Theinfluenceofdeleteriousprocessesincludingenergypooling,photo-ionization,andPenningionizationonthephysicalfeaturesofafiberDPALisstudiedinthisreport.Ithasbeentheoreticallydemonstratedthatthedeleteriousprocessescannotbeignoredinahigh-poweredfiber-DPALsystem.

简介：Lithium-sulfur（Li-S）batteriesbelongtooneofthepromisingtechnologiesforhigh-energy-densityrechargeablebatteries.However,sulfurcathodessufferfrominherentproblemsofitspoorelectronicconductivityandtheshuttlingofhighlydissolublelithiumpolysulfidesgeneratedduringthecycles.Loadingsulfurintoporouscarbonshasbeenprovedtobeaneffectiveapproachtoalleviatetheseissues.Mesoporousandmicroporouscarbonshavebeenwidelyusedforsulfuraccommodation,butmesoporouscarbonshavepoorsulfurconfinement,whereasmicroporouscarbonsareimpededbylowsulfurloadingrates.Here,acore-shellcarbon,combiningboththemeritsofmesoporouscarbonwithlargeporevolumeandmicroporouscarbonwitheffectivesulfurconfinement,waspreparedbycoatingthemesoporousCMK-3withamicroporouscarbon（MPC）shellandservedasthecarbonhost（CMK-3@MPC）toaccommodatesulfur.Aftersulfurinfusion,theas-obtainedS/（CMK-3@MPC）cathodedeliveredahighinitialcapacityofupto1422mAh·g-1andsustained654mAh·g-1reversiblespecificcapacityafter36cyclesat0.1C.Thegoodperformanceisascribedtotheuniquecore-shellstructureoftheCMK-3@MPCmatrix,inwhichsulfurcanbeeffectivelyconfinedwithinthemeso/microporouscarbonhost,thusachievingsimultaneouslyhighelectrochemicalutilization.

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简介：为了在柴油的核心区域调查微滴尺寸的分发，喷洒，微滴尺寸的即时测量被先进激光2焦点速度计(L2F)进行。L2F的微规模的探查由二foci组成，在他们之间的距离是36μm。测试的嘴有0.2公里直径单个洞。注射压力，针电梯，和曲柄角度的大小被L2F在位置与测量同步从嘴出口的10公里downstream。比在在针下面的离开轴区域，完整的电梯调节并且微滴尺寸的空间分发改变速度集合，水花轴附近的微滴才大。在水花核心区域的微滴尺寸的概率密度分发能在大多数注射时期被适合到Nukiyama-Tanasawa分发，这被发现。

简介：Weperformmicromagneticsimulationsontheswitchingofmagneticvortexcorebyusingspin-polarizedcurrentsthroughathree-nanocontactgeometry.Oursimulationresultsshowthatthecurrentcombinationwithanappropriatecurrentflowdirectiondestroysthesymmetryofthetotaleffectiveenergyofthesystemsothatthevortexcorecanbeeasiertoexcite,resultinginlesscriticalcurrentdensityandafasterswitchingprocess.Besidesitsfundamentalsignificance,ourfindingsprovideanadditionalroutetoincorporatingmagneticvortexphenomenaintodatastoragedevices.

简介：Inthepresentwork,core-shellNi@SiO2catalystswereinvestigatedinordertoevaluatetherelevanceofcatalyticactivityandsurfacestatesofNicoreaswellasNinanoparticlessizetocatalyticpartialoxidationofmethane(POM).ThecatalystswerecharacterizedbyN2adsorption,H2-TPR,XRD,TEMandXPStechniques.Thecatalyticperformanceofthecore-shellcatalystswasfoundtobedependentonthesurfacestatesofcatalyst,whichinfluencedtheformationofproducts.Itwasconsideredthatcarbondioxideformedontheoxidizednickelsites(NiO)andcarbonmonoxideproducedonthereducedsites(Ni).ThesurfacestatesofactivemetalinthedynamicwereinfluencedbothbythesizeofNicoreandtheporosityofsilicashell.However,thecatalyticactivitywouldbedebasedwhenthesizeofNicorewasunderacertainextent,whichcanbeascribedtothefactthecarbondepositionincreasedwiththeincreasingcontentofNiO.TheeffectsofsurfacestatesofNi@SiO2catalystonthecatalyticperformancewerediscussedandthereactionpathwayoverNicoreencapsulatedinsidesilicashellwasproposed.