简介：Contact-impactprocessesoccuratmostcasesinmultibodysystems.Sub-periodsandsub-regionalmethodsarefrequentlyusedrecently,anddifferentcoordinatesareintroducedinbothoftheapproaches.However,thesub-regionalmethodseemstobemoreeffective.Floatingframeofreferenceformulationiswidelyusedforcontacttreatment,whichdescribesdisplacementsbytherigidbodymotionandasmallsuperposeddeformation,andthecoordinatesdepictingthedeformationincludefiniteelementnodalcoordinatesandmodalcoordinates,theformerdealswiththecontact/impactregion,andthelaterdescribesthenon-contactregion.Inthispaper,freeinterfacesubstructuremethodisusedinmodeling,andthedynamicequationofasinglebodyisderived.Then,usingtheLagrangeequationofthefirstkind,thedynamicequationsofmultibodysystemsareestablished.Furthermore,contact-impactareasaretreatedthroughadditionalconstraintequationsandLagrangemultipliers.Usingsuchapproach,thenumberofsystemcoordinatesandthedimensionsofmassmatrixaresignificantlyreducedwiththemodaltruncation,thereforebothoftheefficiencyandaccuracyareguaranteed.Finiteelementmethodinthelocalcontactregioncandealwithcontact/impactbetweenarbitrarilycomplexinterfaces,whereas,additionalcontactconstraintsusedinthenodaldescriptionregioncanavoidthecustomizedparametersthatareusedinthecontinuousforcemodel.

简介：Thedeuteronisalooselyboundstateoftwonucleons.Itisnaturaltoexpectotherboundstatescomposedoftwohadrons,thatis,hadronicmolecularstates[1].AftertheobservationbytheBelleCollaboration,theX(3872)wasrelatedtoalooselyboundstateofDˉDimmediatelyduetothefactthatitsmassisneartheDˉDthreshold.Recently,theBelleCollaborationannouncedtwochargedbottomonium-likestructuresZb(10610)andZb(10650)neartheBˉBandBˉBthresholds[2].TheanalysisoftheangulardistributionindicatedbothZb(10610)andZb(10650)favorIG(JP)=1+(1+).AstructureZc(3900)closetotheDˉDthresholdwasalsoobservedbytheBESIIIcollaborationinthedecayofY(4260),Y(4260)!+??J=[3].

简介：Thepaperproposesanewapproachofpredictingthebifurcationpointsofelastic-plasticbucklingofplatesandshells,whichisobtainedfromthenaturalcombinationoftheLyaponov’sdy-namiccriteriononstabilityandthemodifiedadaptiveDynamicRelaxation(maDR)methoddevelopedrecentlybytheauthors.Thisnewmethodcanovercomethedifficultiesintheapplicationsofthedy-namiccriterion.Numericalresultsshowthatthetheoreticallypredictedbifurcationpointsareinverygoodagreementwiththecorrespondingexperimentalones.Thepaperalsoprovidesanewmeansforfurtherresearchontheplasticbucklingparadoxofplatesandshells.

简介：Basedonarelativisticquarkmodelapproach,thetransitionpropertiesofthefirstnucleonresonance△(1232),andthecouplingconstantsgπNN,g△πNareinvestigated.Tvodifferentvaystoremovethecenterofmassmotionareconsidered.Theresultsoftherelativisticapproacheswithandwithoutcenterofmasscorrectionarecomparedwiththoseofnonrelativisticconstituentquarkmodel.Moreover,pionmesoncloudeffectonthesecalculatedobservablesisexplicitlyaddressed.Betterresultsareobtainedbytakingthepionmesoncloudintoaccount.

简介：Missingdataandtime-dependentcovariatesoftenarisesimultaneouslyinlongitudinalstudies,anddirectlyapplyingclassicalapproachesmayresultinalossofefficiencyandbiasedestimates.Todealwiththisproblem,weproposeweightedcorrectedestimatingequationsunderthemissingatrandommechanism,followedbydevelopingashrinkageempiricallikelihoodestimationapproachfortheparametersofinterestwhentime-dependentcovariatesarepresent.Suchprocedureimprovesefficiencyovergeneralizedestimationequationsapproachwithworkingindependentassumption,viacombiningtheindependentestimatingequationsandtheextractedadditionalinformationfromtheestimatingequationsthatareexcludedbytheindependenceassumption.Thecontributionfromtheremainingestimatingequationsisweightedaccordingtothelikelihoodofeachequationbeingaconsistentestimatingequationandtheinformationitcarries.Weshowthattheestimatorsareasymptoticallynormallydistributedandtheempiricallikelihoodratiostatisticanditsprofilecounterpartfollowcentralchi-squaredistributionsasymptoticallywhenevaluatedatthetrueparameter.Thepracticalperformanceofourapproachisdemonstratedthroughnumericalsimulationsanddataanalysis.

简介：Anapproachbasedoncontinuumdamagemechanicstofatiguelifepredictionforstructuresisproposed.Anewfatiguedamageevolutionequationisdeveloped,inwhichtheparametersareobtainedinasimplewaywithreferencetotheexperimentalresultsoffatiguetestsonstandardspecimens.WiththeutilizationofAPDLlanguageontheANSYSplatform,afiniteelementimplementationispresentedtoperformcouplingoperationondamageevolutionofmaterialandstressredistribution.ThefatiguelivesofsomenotchedspecimensandaPitch-change-linkarepredictedbyusingtheaboveapproach.Thecalculatedresultsarevalidatedwithexperimentaldata.

简介：

简介：Aerodynamicforcesanddynamicperformancesofrailwayvehiclesarecoupledandaffectedbyeachother.Ontheonehand,aerodynamicforceschangethedisplacementsofatrain.Ontheotherhand,displacementsaffectaerodynamicforces.Basedonvehicle-trackcouplingdynamicsandaerodynamics,anumericalapproachtotheinteractionbetweenairflowandahigh-speedtrainispresentedinthispaper.Aerodynamicforcesanddynamicperformancesofahigh-speedtrainsubjectedtocrosswindwerenumericallysimulated.Resultsshowedthattheinteractionbetweenairflowandahigh-speedtrainhasasignificantinfluenceondisplacementsandaerodynamicforcesoftheheadcoach.Therefore,itisnecessarytoconsidertheinteractionbetweenairflowandahigh-speedtrainsubjectedtocrosswind.

简介：

简介：

简介：ThispaperdealswiththeapplicationofAcousto-ultrasonics,incon-junctionwithPatternRecognitionandClassificationtechniques,totheidentificationofresidualimpactpropertiesofaclassofpolymericmaterial,namely,Polyvinylchlo-ride(PVC).PVCspecimensofdifferentlow-energyrepeatedimpactdamagestatesareprocessedbyAcousto-ultrasonics(AU)toretrieveAUsignalsintheformofdig-italizedrecords.TheseAUsignalsaregroupedasdistinctclasses,eachpertainingtoaknownlevelofrepeatedimpactdamage.DescribingfeaturesoftheseAUsignalsareusedtobuildPatternRecognition(PR)Classifiers.TheseclassifiersareusedtoidentifyunknowndamagestatesinotherPVCspecimensbyclassifyingthere-trievedAUsignalsasbelongingtooneoftheclasses.TheobtainedresultsindicatethatAcousto-ultrasonicsincombinationwithPatternRecognitionandClassificationtechniquescanbeusedforthequantitativenon-destructiveidentificationofdamagestatesinPVCspecimensofunknownlow-energyrepeatedimpactconditions.

简介：有磁力地稳定的床是受到液体驱动的变丑并且由有磁力地导致的interparticle力量控制了的包装的床。这份报纸作为可变形的多孔的媒介处理有磁力地稳定的床并且在灰尘过滤描述他们的申请。放大法律的RichardsonZaki，U/Ut=n描述这块地经由代表n的控制的床扩大，那产出孔依赖者流动长度规模dc=dpn。纸处理二个问题：由假定同类的床扩大和床变量流动长度规模的一个定义的(i)变丑特征；(ii)清扫象以可变流动长度规模表示并且由试验性的数据说明了的过滤器系数，特定的存款和过滤效率那样的过滤特征。

简介：

简介：Generalizedsimplexvariantsbasedonsuccessivelinearsubprogrammingapproach(SLS)aredescribedinthispaper.Insteadofinversematrix,thesevariantsemployMoore-Penroseinverse.Theyarerespectivelycharacterizedbydifferentpivotingrules,Numericalresultsoflimitedtestsshowencouragingperformanceofthesevariants.

简介：

简介：

简介：Weproposethespectrumallocationandresourceschedulingalgorithmsincognitivepointtomultipoint(PMP)networkswithrapidchangesofspectrumopportunitiesandpresentamediaaccesscontrol(MAC)protocolbasedonthesealgorithms.Theobjectiveofspectrumallocationistomakeefficientuseofthespectrumwhilemaintainingthetransceiversynchronizationonfrequencyandtimeinthenetwork.Theobjectiveofresourceschedulingistoguaranteethequalityofservice(QoS)requirementsofdifferentkindsofconnectionsandtominimizethetotalenergyconsumptioninthenetworkaswell.Bysensingonlyasmallsetofpossiblechannelsineachslotbasedonthestatetransitionprobabilityofeachchannel,ourspectrumallocationalgorithmachieveshighspectrumefficiencyinthenetwork.Theresourceschedulingproblemisdividedintothreesubproblemsandwederiveoptimalsolutionstotheseproblemsbygreedyalgorithmandconvexoptimization.Thesimulationresultsshowthatouralgorithmcanmakeefficientuseofthespectrumandthenetworkresourcesatacostoflowcomputationalcomplexity.

简介：在这篇论文，我们扩大印射的途径到N顺序Schroedingerequation。以扩大印射的途径，有一些任意的函数的可变分离解决方案的新家庭被导出。

简介：

简介：Inthispaper,weconsidernonlinearinfinity-normminimizationproblems.WedeviceareliableLagrangiandualapproachforsolvingthiskindofproblemsandbasedonthismethodweproposeanalgorithmforthemixedlinearandnonlinearinfinity-normminimizationproblems.Numericalresultsarepresented.