简介:WeconsideranMX/G/1queueingsystemwithtwophasesofheterogeneousserviceandBernoullivacationschedulewhichoperateunderalinearretrialpolicy.Inaddition,eachindividualcustomerissubjecttoacontroladmissionpolicyuponthearrival.ThismodelgeneralizesboththeclassicalM/G/1retrialqueuewitharrivalsinbatchesandatwophasebatcharrivalqueuewithasinglevacationunderBernoullivacationschedule.Wewillcarryoutanextensivestationaryanalysisofthesystem,includingexistenceofthestationaryregime,embeddedMarkovchain,steadystatedistributionoftheserverstateandnumberofcustomerintheretrialgroup,stochasticdecompositionandcalculationofthefirstmoment.
简介:TheproblemofquickanalysisusingexactgeometrydatawasproposedbyHughesetal.andtheisogeometricanalysisframeworkwasintroducedasasolution.Inthisletter,theexactgeometryconceptiscombinedintothequasi-conformingframeworkandanovelmethod,i.e.,theexactgeometrybasedquasi-conforminganalysisisproposed.Inpresentmethodthegeometryisexactlydescribedbynon-uniformrationalB-splinebases,whilethesolutionspacebytraditionalpolynomialbases.Presentmethodcombinesthemeritsofbothisogeometricanalysisandquasi-conformingfiniteelementmethod.InthisletterEuler-Bernoullibeamproblemissolvedasanexampleandtheresultsshowthatthepresentmethodiseffectiveandpromising.
简介:考虑动态输出反馈控制下Euler-Bernoulli梁的振动抑制问题,证明了系统算子生成的C0-半群,不指数稳定但渐近稳定.且当初值充分光滑时,利用Riesz基方法估计出系统能量多项式衰减.
简介:ThenonlinearvibrationsofviscoelasticEuler–BernoullinanobeamsarestudiedusingthefractionalcalculusandtheGurtin–Murdochtheory.EmployingHamilton'sprinciple,thegoverningequationconsideringsurfaceeffectsisderived.Thefractionalintegro-partialdifferentialgoverningequationisfirstconvertedintoafractional–ordinarydifferentialequationinthetimedomainusingtheGalerkinscheme.Thereafter,thesetofnonlinearfractionaltime-dependentequationsexpressedinastate-spaceformissolvedusingthepredictor–correctormethod.Finally,theeffectsofinitialdisplacement,fractionalderivativeorder,viscoelasticitycoefficient,surfaceparametersandthickness-to-lengthratioonthenonlineartimeresponseofsimply-supportedandclamped-freesiliconviscoelasticnanobeamsareinvestigated.
简介:随便选一个四位数,如1628,先把组成1628的四个数字,由大到小排列得到8621;再把组成1628的四个数字由小到大排列得1268.用大的减去小的:8621-1268=7353;把7353按着上面的办法再做一遍:由大到小排,7533;由小到大排,3357.相减7533-3357=4176把4176再重复一遍:7641-1467=6174.如果再往下做,奇迹就出现啦!7641-1467=6174,又回到了6174.这是偶然的吗?我们再随便举一个四位数:1331,按上面讲的方法连续去做:3311-1133=2178;8721-1278=7443;7443-3447=3996;9963-3699=
简介:我们推导出两类四角系统的Wiener数和Hyper—Wiener数的计算公式.