简介:TheeffectsofσandΦmesonsonthesurfaceredshiftofaneutronstarhavebeeninvestigatedwithintheframeworkofrelativisticmeanfieldtheoryforthebaryonoctet{n,p,Λ,Σ,Σ0,Σ+,Ξ,Ξ0}system.ItisfoundthatcomparedwiththosewithoutconsideringthecontributionsofσandΦmesons,thesurfaceredshiftdecreasesandthatcorrespondingtothemaximumvalueofthemassalsodecreasesfrom0.2540to0.2236,aboutby12%.Meanwhile,itisalsofoundthatincludingσandΦmesons,theM/Randthatcorrespondingtothemaximummassdecrease.
简介:Thestarnetworks,whichwereoriginallyproposedbyAkersandHarel,havesufferedfromarigorousrestrictiononthenumberofnodes.Thegeneralincompletestarnetworks(GISN)areproposedinthispapertorelievethisrestriction.AnefficientlabelingschemeforGISNisgiven,androutingandbroadcastingalgorithmsarealsopresentedforGIS.ThecommunicationdiameterofGISNisshowntobeboundedby4n-7.TheproposedsinglenodebroadcastingalgorithmisoptimalwithrespecttotimecomplexityO(nlog2n).
简介:学习者面对每一个学习挑战,均要经历形成想法,听取专家的观点分析,进行研习探究,进而检查自身理解程度,最后公开交流,综合不同的观点。作为建构主义学习中锚桩教学模式的一个典范,"STAR财富"学习循环圈协调了有效学习环境的四大要素,即以学习者为中心,以知识为中心,以评价为中心和以学习共同体为中心,提供了解决重要问题、评估学习进程和反思完善的机会。
简介:Inordertoachieveawheelchairclimbstairsfunction,thispaperdesignsastar-wheelstair-climbingmechanism.Throughtheeffectofthelockcoupling,thestar-wheelstair-climbingmechanismisformedtobefixedaxisgeartrainorplanetarygeartrainachievingflat-walkingandstair-climbingfunctions.Crossingobstacleanalysisobtainsthemaximumheightandminimumwidthofobstaclewhichthewheelchaircancross.Stress-strainanalysisinSolidworkssimulationisperformedtoverifymaterialstrength.
简介:Theuseofliving,alkyllithium-initiatedanionicpolymerizationtopreparechain-endfunctionalizedpolymersandheteroarm,star-branchedpolymersisdiscussed.Thescopeandlimitationsofspecificterminationreactionswithavarietyofelectrophilicspeciesareillustratedforcarbonation,hydroxyethylation,amination,andsulfonation.Themethodologyofusingsubstituted1,1-diphenylethylenestoprovideageneral,quantitativefunctionalizationprocedureisoutlinedandillustratedwithexamplesofamineandphenolend-functionalization.Amethodologyisdescribedforthesynthesisoffunctionalized,star-branchedcopolymerswithcompositionallyheterogeneousarmsofcontrolledmolecularweightandnarrowmolecularweightdistributionusing1,3-bis(1-pbenylethenyl)benzene.
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