简介:TheauthorsestablishsomeuniformestimatesforthedistancetohalfwaypointsofminimalgeodesicsintermsofthedistantcetoendpointsonsometypesofRiemannianmanifolds,andthenprovesometheoremsaboutthefinitegenerationoffundamentalgroupofRiemannianmanifoldwithnonnegativeRiccicurvature,whichsupportthefamousMilnorconjecture.
简介:LetAbeaunitalC*-algebra,n∈N∪{∞}.Itisprovedthattheisomorphism△n:Un0(A)/DUn0(A)→AffT(A)/△n0(π1(Un0(A)))isisometricforsomesuitabledistances.Asanapplication,theauthorhasthesplitexactsequence0→AffT(A)/△n0(π1(Un0(A)))iA→Un(A)/DUn(A)πA→Un(A)/Un0(A)→0withiAcontractive(andisometricifn=∞)undercertainconditionofA.
简介:VisegrádGroupisoneofthemostdynamicinternationalorganizationsamongCentralandEasternEuropeancountries.ItsmembersarePoland,theCzechRepublic,SlovakiaandHungary.TradebetweenVisegrádGroupandChinaaccountsforover70%ofthetotaltradebetweenChinaandCentralandEasternEurope(CEE),highlightingthegroup'simportance.
简介:我们是否用声学的记载的工具测量阶段或组速度,仍然被说服。在这份报纸,三种模型被用来由理论分析和数字模拟调查这个问题。首先,我们使用与不同速度包含二个飞机波浪的飞机波浪重叠模型并且能改变阶段速度和组速度的价值。数字结果看那阶段速度是否比组速度更高或低,用缓慢时间连贯(STC)我们能仅仅给阶段速度的方法。根据分散分析和分支切割集成的结果,当组速度由到达时间拣获得了时,第二在僵硬边界地上凿穿为分散曲线的结果和STC方法获得的速度是阶段速度的一阶的模式表演的波形建模。最后,偶极子登录一个慢形成模型用分散分析和真实轴的集成被调查。分散曲线和完整的波浪火车的结果与僵硬边界条件作为地上凿穿模型显示出类似的结论。
简介:Inthispaper,wegivetheholomorphicautomorphismgroupofthehigher-dimensionalgeneralizationofThullendomain.
简介:TheWorkingGrouponInternationalBorders---GeoenvironmentalConcerns(IBC)wasestablishedinlate2003andoperatesundertheauspicesofTheIUGSCommissiononGeologicalSciencesforEnvironmentalPlanning(COGEOENVIRONMENT).Thefollowingisabriefreportofthefirstyear'sactivitiesoftheIBCduring2003.
简介:Thetitlepolymerwaspreparedfrom5-diethylamino-3-thia-pentylglycidyletheranddiethyleneglycolbisglycidyletherviaring-openingcopolymerization.Itwasfoundthatthisreactioncouldbecatalyzedbysodium,butnotLewisacid.Theobtainedpolymercancoordinatewithplatinumcompound,andtheplatinumcomplexisanewkindofcatalystforthehydrosilylationofolefinswithtriethoxysilane.
简介:磅(基于地点的服务)是从GIS的发展的显著结果到geospatial信息服务。从下一代因特网和网提供的群众和机会由geospatial信息的要求面对了2.0,geospatial信息服务的一个新模型基于DMI(数字可测量的图象)被介绍。首先,磅的概念和网2.0的机会被介绍,然后,DMI的特征被讨论。拿图象城市
简介:DigitaldecayspectroscopyofactinideisotopesatthegasfilledseparatorSHANSAlloverthechartofnuclides,theregiontothe“north-east”of208Pb,withZ≥84andN=128~130,hoststheshortest-livedαradioactivities,withhalf-livesintherangeofnanosecondstomicroseconds.Synthesisanddetectionofneutron-deficientisotopesabovethoriuminthisregionarechallengingduetotheirlowproductioncrosssectionsandshorthalf-lives.