简介:Theequilibriumgeometries,relativestabilities,andelectronicpropertiesofMnAgm(M=Na,Li;n+m≤7)aswellaspureAgn,Nan,Lin(n≤7)clustersaresystematicallyinvestigatedbymeansofthedensityfunctionaltheory.Theoptimizedgeometriesrevealthatfor2≤n≤7,therearesignificantsimilaritiesingeometryamongpureAgn,Nan,andLinclusters,andthetransitionsfromplanartothree-dimensionalconfigurationsoccuratn=7,7,and6,respectively.Incontrast,thefirstthree-dimensional(3D)structuresareobservedatn+m=5forbothNanAgmandLinAgmclusters.Whenn+m≥5,astrikingfeatureisthatthetrigonalbipyramidbecomesthemainsubunitofLinAgm.Furthermore,dramaticodd-evenalternativebehavioursareobtainedinthefragmentationenergies,secondorderdifferenceenergies,highestoccupiedandlowestunoccupiedmolecularorbitalenergygaps,andchemicalhardnessforbothpureanddopedclusters.Theanalyticresultsexhibitthatclusterswithanevenelectronicconfiguration(2,4,6)possesstheweakestchemicalreactivityandmoreenhancedstability.
简介:Thebundleofthe2-formson6-manifolddecomposesintothreesubbundlessuchthatΛ2(R6)=Λ21⊕Λ26⊕Λ28withdimensions1,6and8,respectively.Theselfandantiselfdualitysolutionsofthe2-forms,calledΦ-duality,arehandledandthesesolutionsshowthattheantiselfdualgaugefieldsliveonthesubbundlesΛ21andΛ26whiletheselfonesequationsonΛ28.AlsothesolutiononΛ21presentsaflatconnection.Inaddition,thecurvaturesoftheconnectionsonΛ26andΛ28haveTr[F3]=0,andsothetopologicalinvariantsdeterminedbytheChernclasses,i.e.topologicalcharge,consistonlyonthesecondChernclass.Intheresultofthiscase,theantiselfandselfΦ-dualgaugeinvariantLagrangiansofdefinedonbothsubbundlesareboundedbythesametopologicalcharge.Also,onegivesaquantizationcasetoberelatingtotheinstantonnumber.
简介:Sr原子的运动过程在He-Sr的亚稳亚稳的转变激光纵的搏动的分泌物被分析,一个简明前後一致的物理模型被开发。分泌物参数,主要粒子密度,电子温度,和放射激光的脉搏的时间的进化是数字地计算的。模型提供的结果同意有实验的井,和每激光脉搏的时间的行为被模拟结果成功地解释。[从作者抽象]
简介:电影冷却是一项重要措施启用一台煤气的汽轮机并且从而的入口温度的增加,到改进它的全面效率。冷却剂在片或endwalls通过洞的spanwise排被逐出建立防护材料的一部电影。洞经常在下游的方向被使倾向并且产生一个肾旋涡。这是相反旋转的旋涡对,与在二个旋涡之间的一个向上的流动方向,它趋于上升离开表面并且局部地在对外面向片喂热空气。颠倒旋涡的旋转感觉颠倒这二个缺点进优点。在考虑盒子中,一个反肾旋涡用两个都使倾向的洞的二随后的排被产生有内错角的下游、偏航的spanwise。在以前的研究,我们执行了大旋涡的模拟(它集中了于充分狂暴的边界层)凉下来电影、比较的这个反肾旋涡他们到一个相应物理实验。现在的工作详细分析模仿的流动领域,在全体会议开始(在片或endwall内)通过直到有热边界层的混合的洞。识别在吝啬的流动并且在即时流动发现的旋涡的结构,我们主要使用2标准和显示的线积分卷绕旋转(LIC)技术部分优化。流动区域(冷却剂全体会议,洞,和边界层)随后被学习并且连接了到对方。在整个边界层追踪反肾旋涡,我们建议基于涡度的二个标准并且在LIC结果上。这使我们能在墙把喷气旋涡与冷却有效性联系,它是电影冷却的特色。
简介:Itisoftenstatedthatevencleantokamakdischargesdisruptathighdensity.Onepossibilityisthatsuchdisruptionresultfromtheenergylossarisingfromhydrogenrecyclingattheedgeoftheplasma.thisenergylosscouldleadtoacontractionofthecurrentchannelandtheproductionofadisruptivelyunstableconfiguration.
简介:Basedonthesecond-ordermoments,thispaperderivesananalyticalexpressionoftheM2factoroffour-petalGaussianbeam.TheresultsshowthattheM2factorisonlydeterminedbythebeamordern.Thecorrespondingnumericalcalculationsarealsogiven.Asthebeamorderincreases,theaugmentofM2factorisdisciplinary.AstheexpressionofM2factorisexpressedinseriesformandbecomesmorecomplicated,anewconciseformulaofM2factorisalsopresentedbyusingcurvefittingofnumericalcalculations.When3≤n≤200,themaximumerrorrateoffittingformulawillnotexceed2.6%andtheaverageerrorrateis0.28%.Thisresearchishelpfultotheapplicationsoffour-petalGaussianbeam.