简介：AnSMIBmodelinthepowersystems,especiallythatconceringtheeffectsofhardlimitsonbifurcations,chaosandstabilityisstudied.Parameterconditionsforbifurcationsandchaosintheabsenceofhardlimitsarecomparedwiththoseinthepresenceofhardlimits.Ithasbeenprovedthathardlimitscanaffectsystemstability.Wefindthat(1)hardlimitscanchangeunstableequilibriumintostableone;(2)hardlimitscanchangestabilityoflimitcyclesinducedbyHopfbifurcation;(3)persistenceofhardlimitscanstabilizedivergenttrajectorytoastableequilibriumorlimitcycle;(4)HopfbifurcationoccursbeforeSNbifurcation,sothesystemcollapsecanbecontrolledbeforeHopfbifurcationoccurs.Wealsofindthatsuitablelimitingvaluesofhardlimitscanenlargethefeasibilityregion.Theseresultsarebasedontheoreticalanalysisandnumericalsimulations,suchasconditionforSNBandHopfbifurcation,bifurcationdiagram,trajectories,Lyapunovexponent,Floquetmultipliers,dimensionofattractorandsoon.

简介：ItiswellknownthatsplinesmoothingestimatorrelatestotheBayesianestimateunderpartiallyinformativenormalprior.Inthispaper,wederivetheconditionsfortheproprietyoftheposteriorinthenonparametricmixedefectsmodelunderthisclassofpartiallyinformativenormalpriorforfxedefectwithinversegammapriorsonthevariancecomponentsandhierarchicalpriorsforcovariancematrixofrandomefect,thenweexploretheGibbssamplingprocedure.

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简介：Inthispaper,theconceptofdistributioneffectisproposedwithoutthecausaldiagram.FollowingthenotationofStone[11],weassumethattheexposuretreatmentXisanunknowndeterministicfunctionoftheconfoundersetPa(X)andarandomerrorε.Wediscusssufficientandnecessaryconditionsforhomogeneity,collapsibilityandnonconfoundingfordistributioneffectsanddiscussrelationsamongthem.

简介：ThispaperpresentsaunifieddiagnosticmethodforexponentialnonlinearmodelswithrandomeffectsbaseduponthejointlikelihoodgivenbyRobinsonin1991.Theauthorsshowthatthecasedeletionmodelisequivalenttomeanshiftoutliermodel.Fromthispointofview,severaldiagnosticmeasures,suchasCookdistance,scorestatisticsarederived.ThelocalinfluencemeasureofCookisalsopresented.Numericalexampleillustratesthatourmethodisavailable.

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简介：在这篇文章下列随机拦截混合效果模型将被考虑：y_(ij)=v_i+x_(ij)~τβ+ε_(ij)，i=1，...，m；j=1,2，...，n_i，在此{v_i}arei.i.d。有吝啬的α和有限变化σ_v~2的随机的效果；{ε_(ij)}是有有限变化σ_ε~的i.i.d随机错误2。这里，我们将估计α，σ_v~2，σ_ε~2，β和学习他们的大样品性质例如强壮的一致性，强壮的集中率和asymptotic规度。

简介：为Fermi-Dirac粒子的完整的四轮马车方程的答案的光滑被调查。到Landau-Fermi-Dirac方程的平衡附近的古典答案有调整，这被显示出在所有变量(时间，空间和速度)的效果，也就是说，他们关于所有变量变得立即光滑。

简介：Ageometricframeworkisproposedfornonlinearmodelswithrantiomeffects,basedonamodifiedversionofthegeometricstructurepresentedbyBates&Wattes(1980).Thisgeometricframeworkisusedtostudysomeasymptoticinferenceintermsofcurvaturesfornonlinearregressionmodelswithrandomeffects.Severalpreviousresultsareextended.

简介：在这篇文章，我们学习一个部分指定的空间面板数据的评价线性回归与随机效果。在外长的空间weighting矩阵和外长的regressors的条件下面，我们给一个仪器的可变评价。在某些足够的假设下面，我们证明为有限维的参数的建议评估者是一致、通常asymptotically分布式的root-N，为未知函数的建议评估者一致、asymptotically分布式。为两个的asymptotic变化协变性矩阵的一致评估者参量、未知的部件被提供。蒙特卡罗模拟结果验证我们的理论并且建议途径有某实际价值。

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简介：Westudyamodelforthelong-termbehaviorofasingle-speciespopulationwithsomedegreeofpollutiontoleranceinapollutedenvironment.Themodelconsistsofthreeordinarydifferentialequations:oneforthepopulationdensity,onefortheamountoftoxicantinsidethelivingorganisms,andonefortheamountoftoxicantintheenvironment.Wederivesufficientconditionsforthepersistenceandtheextinctionofthepopulationdependingontheexogenousinputrateofthetoxicantintotheenvironmentandthelevelofpollutiontoleranceoftheorganisms.Numericalsimulationsarecarriedouttoillustrateourmainresults.

简介：Quantileregressionisgraduallyemergingasapowerfultoolforestimatingmodelsofconditionalquantilefunctions,andthereforeresearchinthisareahasvastlyincreasedinthepasttwodecades.Thispaper,withthequantileregressiontechnique,isthefirstcomprehensivelongitudinalstudyonmathematicsparticipationdatacollectedinAlberta,Canada.Themajoradvantageoflongitudinalstudyisitscapabilitytoseparatetheso-calledcohortandageeffectsinthecontextofpopulationstudies.Oneaimofthispaperistostudywhetherthefamilybackgroundfactorsalterperformanceonthemathematicalachievementofthestrongeststudentsinthesamewayasthatofweakerstudentsbasedonthelargelongitudinalsampleof2000,2001and2002mathematicsparticipationlongitudinaldataset.Theinterestingfindingssuggestthattheremaybedifferentialfamilybackgroundfactoreffectsatdifferentpointsinthemathematicalachievementconditionaldistribution.

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