简介：现行人教版初中英语教材Book2中的L-13中有下面两个句子:MrsLiniswalkingslowly.MrZhangiswalkingslowerthanMrsLin.有的同学对slower的用法提出了疑问,说上面一句用了副词slowly,下一句为什么不用它的比较级形式moreslowly,而用slower呢?下面就对slow和slowly的用法作一介绍,供同学们学习时参考。

简介：InthispaperweconsiderpolynomialsplinesS(x)withequidistantnodeswhichmaygrowa5O(|x|~5).Wepresentanintegralrepresentationofsuchsplineswithadistributionkernel.Thisrepre-sentationisrelatedtotheFourierintegralofslowlygrowingfunctions.ThepartoftheFourierex-ponentialsherewithplaythesocalledexponentialsplinesbySchoenberg.Theintegralrepresentationprovidesaflexibletoolfordealingwiththegrowingequidistantsplines.First.itallowsustocon-structarichlibraryofsplinespossessingthepropertythattranslationsofanysuchsplineformaba-sisofcorrespondingsplinespace.Itisshownthatanysuchsplineisassociatedwithadualsplinewhosetranslationsformabiorthogonalbasis.Asexampleswepresentsolutionsoftheproblemsofprojectionofagrowingfunctionontosplinespacesandofsplineinterpolationofgrowingfunc-tion.Wederiveformulasforapproximateevaluationofsplinesprojectingafunctionontothesplinespaceandestablishtherewithexactestimationsoftheapproximationerrors.

简介：Inthispaper,westudyasimplifiedmodelwithdelayforacontroloftestosteronesecretion.EmployingtheejectivefixedpointprincipleduetoNussbaum,theexistenceofslowlyoscillatingperiodicsolutionofthemodelisprovenwhenthedelayparameterr>r0,forsomeconstantr0>0.

简介：卢佩生ＥｖｏｌｕｔｉｏｎｏｆＡｓｉａｎＳｕｍｍｅｒＭｏｎｓｏｏｎａｎｄｔｈｅＳｌｏｗｌｙＶａｒｙｉｎｇＤｉｓｔｕｒｂａｎｃｅｓ￥ＬｕＰｅｉｓｈｅｎｇ（ＩｎｓｔｉｔｕｔｅｏｆＡｔｍｏｓｐｈｅｒｉｃＰｈｙｓｉｃｓ，ＣｈｉｎｅｓｅＡｃａｄｅｍｙｏｆＳｃｉｅ...

简介：Existingfarfieldexpressionsofsecondorderpotentialsarebynomeanscomplete.Hencetherehasbeennoexactfarfieldexpressionofsecondorderpotentials.InthispaperthefarfieldexpressionforΦd（2）ispurposelyavoidedindeducingtheformulaeofsecondorderforcesandaseriesoffunctionsΦdRnareused.Thefarfieldexpressionofisgiven,whichfor（x,U,z）∈Σ,φdRn（2）φd（2）.Usingthesepropertiesformulaeforcalculatingsecondorderdiffractionforcesareobtained.Tocalculatetheintegral∫∫1/gfΨdsitisdividedintotwoparts.Oneistheintegraloverafinitedomainandthefunctionundertheintegraliscontinuous,sotheusualapproximateintegrationformulaemaybeused.Theotheristheintegraloveraninfinitedomain.Usingthefarfieldexpressionoffirstorderpotentials,formulaeforcalculatingtheintegraltomeetgivenaccuraciesaregiven.Themooringforceinsurgedirectionisusedforcomparisonbetweennumericalpredictionsandexperimentalmeasurements.Thepredictedresultsarecheckedagainstthemeasuredvalueinaspeciallydesignedtest.Inthelowfrequencydomainofinterest,themooringforcesinsurge,forcalculatedandexperimentalspectraareingoodconsistencysolongasthedampingcoefficientsischoosenappropriately.

简介：Wesystematicallyinvestigatethemotionofslowlymovingmatter-wavegapsolitonsinanonlinearpotential,producedbytheweakrandomspatialvariationoftheatomicscatteringlength.Withtheweakrandomness,weconstructaneffective-particletheorytostudythemotionofgapsolitons.Basedontheeffective-particletheory,theeffectoftherandomnessongapsolitonsisobtained,andthemotionofgapsolitonsisfinallysolved.Moreover,theanalyticresultsforthegeneralbehavioursofgapsolitonmotion,suchastheensemble-averagespeedandthereflectionprobabilitydependingontheweakrandomnessareobtained.Wefindthatwiththeincreaseoftherandomstrengththeensemble-averagespeedofgapsolitonsdecreasesslowlywherethereductionisproportionaltothevarianceoftheweakrandomness,andthereflectionprobabilitybecomeslarger.ThetheoreticalresultsareingoodagreementwiththenumericalsimulationsbasedontheGross-Pitaevskiiequation.

简介：TheMelnikovmethodwasextendedtoperturbedplanarnon-Hamiltonianintegrablesystemswithslowly-varyingangleparameters.Basedontheanalysisofthegeometricstructureofunperturbedsystems,theconditionoftransverselyhomoclinicintersectionwasestablished.ThegeneralizedMelnikovfunctionoftheperturbedsystemwaspresentedbyapplyingthetheoremonthedifferentiabilityofordinarydifferentialequationsolutionswithrespecttoparameters.ChaosmayoccurinthesystemifthegeneralizedMelnikovfunctionhassimplezeros.