简介:Theeffectsoftheconstantexcitationonthelocalbifurcationoftheperiodicsolutionsinthe1:2internalresonantsystemswereanalyzedbasedonthesingularitytheory.Itisshownthattheconstantexcitationmakeinfluenceonlywhenthereexistsomenonlinearterms,intheoscillatorwithlowerfrequency.Besidesactingasmainbifurcationparameter,theconstantexcitation,togetherwithcoefficientsofsomenonlinearterms,maychangethevaluesofunfoldingparametersandthetypeofthebifurcation.Underthenon-degeneratecases,theeffectofthethirdordertermscanbeneglected.
简介:Theimportanceofcosmologicalconstantforthecosmologicalmodelsisgiven.Thevariationsofthecosmologicalmodelforparametersλandkwerediscussedrespectively.Nearλ=0,thecosmologicalmodelisunstablewiththechangeofλ,andnearλ=β=0,thecosmologicalmodelisunstablewiththechangeofk.Sowhenweconsiderthestablecosmologicalmodel,wemustconsiderthenonzerocosmologicalconstant.
简介:四轮马车常数的性质在这笔记被调查。以hypergeometric功能,3F2被给的一个新代表和定义四轮马车常数的asymptotic序列的家庭的一个性质被形式化。而且,我们由在Poincar的意义使用gamma功能的比率的asymptotic扩大给四轮马车常数的另外的asymptotic扩大?
简介:我们在场有在非线性的electrodynamics的宇宙论的经常的Λ的常规黑洞的一个班。而不是在黑洞地平线后面的平常的奇特,所有领域和弯曲invariants为常规黑洞到处是常规的。通过计量器不变的途径,常规黑洞的线性地动态的稳定性被学习。在odd-paritysector,我们发现Λ术语不出现在不安的主人方程,常规黑洞在奇怪同等值的不安下面是稳定的whichshows。在另一方面为平同等值的部门,没有宇宙论的常数,主人方程是比盒子更复杂的。我们为常规黑洞的稳定性获得足够的条件。我们也调查常规黑洞的热力学的性质,并且发现那些热力学的数量不满足黑洞热力学的第一条法律的微分表格。为违背第一条法律的原因被揭示。
简介:PropertiesofLebesguefunctionforLagrangeinterpolationonequidistantnodesareinvestigated.ItisprovedthatLebesguefunctioncanbeformulatedbothintermsofahypergeometricfunction2F1andJacobipolynomials.Moreover,anintegralexpressionofLebesguefunctionisalsoobtainedandtheasymptoticbehaviorofLebesgueconstantisstudied.
简介:TheChnstantMndulusAlgoriihm(CMA)enjoyWidepreadpopularityasmethodsforblindbeamform-ingandequalzzationofcommunicationsignals.CMAisstraightforwardtoimplement,robust,andcomputation-zllyofmixierarecomplexity.Furtherlnore,itisinsensitiuetoarrayimperfection.Inanenvironmentcontaintingmultipleconsrantmndulussignals,thesignalextractedbyCMAdependsontherelativepoweroftheincidentsig-nals.Accordingpreviousanrks,theCMAisI,ronewcapturetheStrongestConstantModulus(CM)Signalatthe,outputofthearray.Inthispoper,weshowthattheweakCMsignalcouldberecoveredbyCMA1-2andCMA2-1whenseuingspecialstep-siss.Szmulatzonexamplesconfzrmourremarks.
简介:ThestabilityconstantsofthebinarycomplexesofMn2+withnicotinamide(NA)weredeterminedfrompotentiometricpHtitrationsdataat15.0,25.0and35.0oCandI=0.1,0.2,0.4molL-1(NaClO4).Theformationofbinary1:1,1:2NA-Mncomplexesatthreedifferenttemperaturesandtheinfluenceofthreedifferentionicstrengthontheirstabilitywerereported.Thethermodynamicparameters(△Gof,△Sof,△Hof)forthecomplexformationreactionwereestimatedfromstabilityconstantatdifferenttemperatures.
简介:α-andβ-cyclodextrinsconsistingofsixandsevenglucoseresiduesrespectively,havelipophiliccavitieswithdifferentinnerdiameters.Theyformhost-guestinclusioncomplexeswithhydrophobicorganicandorganometallicguestmoleculesinaqueoussolution.Thesehost-guestcomplexeshaveprovedtobeexcellentmodelsystemsforstudyingthenatureofnoncovalentbondingforcesinaqueousmedia.TheyhaveprovidedvaluableinsightsintothehydrophobiceffectandLondondispersionforcesandaregoodmodelforunderstandingthespecificityofenzymesubstrateinteractions[1]Evidencefortheformationofinclusioncomplexeshavebeenprovidedfromcalovimetrictitration[2]NMR[33],circulardichroism[4],UV[1]andfluorescencespectra[5]andconductometricmethod[6]etc.Herewereportanewfluorimetricmethodforastudyonthereactionofthehost-guestinclusioncomplexesofcyclodextrinwithphenols.Dissociationconstants(Kd)oftheinclusioncomplexesofsomephenolswithα-β-cyclodextrinareestimatedbasedonthevariationofthefluorescentintensityandmodifiedHarad'equations.
简介:Sprayauto-ignitionexperimentswerecarriedoutinaconstantvolumecombustionchamberforsomepurealkanes(n-paraffinswithdifferentchainlength,cyclohexane,n-butylcyclohexane,andisooctane)andblendsofn-decanewithStandardBlendedFuel(isooctane/n-heptane)andproductgasoline.Testresultsshowedthatthereactionactivityofn-paraffinswasrelativelyhigh.Meanwhile,theauto-ignitioncharacteristicsdifferedsignificantlywiththemolecularstructuresofalkanes.Addingdifferentvolumefractionsofn-decanetoStandardBlendedFuelandproductgasolinecouldimprovethefuelreactionactivityatvaryingdegree.Finally,functionalgroupseffectswereusedtosimulatetherelationshipbetweenthemoleculartopologyandtheauto-ignitionquality.
简介:在这份报纸,我们学习(伪,分级的旗帜弯曲在上的尾)度量标准一歧管尺寸n的M(n鈮?3)。建议那一(伪,尾)度量标准F不是Randers类型的一个Finsler度量标准,也就是说F鈮吗?+k3尾k1>0,k2并且k3是M上的分级的功能。如果并且仅当,我们证明F具有分级的旗帜弯曲并且消失的S弯曲旗帜弯曲K=0并且F是一个Berwald度量标准。在这种情况中,F是一局部地Minkowski度量标准。关键词Finsler度量标准-(伪,尾)度量标准-旗帜弯曲-S弯曲-Minkowski公制的先生(2000)题目分类53B40-53C60由中国(资助号码10971239)的国家自然科学基础支持了
简介:Ignitionmodelsoftestedmaterialhaveimportantsignificancetofireprevention.Inordertoknowheattransferofthermalthinmaterialinfiredisaster,startingfromthelawofconservationofenergy,simplifyingheatcapacityintoaconstantaccordingtoDulong-Petitlaw,andthreecalculationformulasofignitiontimeofthermalthinmaterialinaconstantheatfluxwererespectivelyobtainedundertheconditionsofignoringheatloss,linearprocessingheatlossandconsideringthermalradiation.Therelationbetweentheignitiontimeandthethermalcurrentintensitywasdiscussed.