化學和生命體系中內隨機共振的特性及機理的理論研究.pdf

1、中國科學技術大學博士學位論文化學和生命體系中內隨機共振的特性及機理的理論研究姓名：鐘實申請學位級別：博士專業(yè)：物理化學指導教師：辛厚文2001.5.1AbstractNonlinearchemistryisanewinterdisciplinarysciencewhoseresearchobjectisnonlinearbehaviorsofchemicalsystemsthatoccurfarfromequilibriumIfweca

2、llthesenonlinearbehaviorsnonlinearstates，andalsotakeintoconsiderationthefactthatnoiseiSinevitabteinnaturetheinvestigationonthetransitionanditS1awofthesestatesundertheperturbationofnoiseisofgreatimportanceinnonlinearchemi

3、stryandhasgainedgrowingattentioninrecentyearsNoiseisusuallyconsideredtheenemyoforder，however，recentinvestigationshasshownthatnoisecanplayaconstructiveroleinnonlinearsystemsthroughacounterintuitivemechanismcalledstochasti

4、cresonancerSRlSRiSacooperativebehaviorbetweennonlinearsystem，signalandnoise，ie，thesignalcanbeamplifiedbytheassistanceofnoise，andtheoutputsignaltonoiseratioofthesystemcanreachamaximumwithappropriatenoiselevelRecentlyinter

5、nalSRasanontrivialextensionofSRhasalsoattractedmanyscientists’attentionInternalSRisaSRlikephenomenoninwhichanexternalsignalisabsentInthisdissertation，wehavestudiedthecharacteristicsandmechanismofinternalSRinchemicalandli

6、vingsystemsInchemicalsystem，wehaveinvestigatedthedynamicsofthesystemundertheperturbationofwhiteandcolorednoise，respectively，andalsoinvestigatedthenoisydynamicsofcoupledsystemWefoundthatbothwhitenoiseandcolorednoisecanind

7、uceinternalSR，andthenoisepulselengthofwhitenoiseandcorrelationtimeofcolorednoisestronglyaffecttheresonancebehaviorIncoupledsystem，wefoundthatinternalSRCallbepropagatedandamplifiedbytheassistanceofcoupling，andcouplingstre

8、ngthasatunableparameterCanbeusedtocontrolinternalSRInlivingsystemswehavestudiednoiseeffectsinexcitablebiomembraneandintracellularcalciumoscillationsWefoundtheexistenceofinternalSRinthetwosystems，whichimpliesthatnoisemayb

9、eplayafunctionalrolethroughinternalSRinlivingsystemsInthemajoritystudiesoninternalSR，thepulselengthandcorrelationtimeofnoisewerenottakenintoaccount，furthermore，inthepreviousresearchesincoupledchemicalsystemsandlivingsyst

10、ems，verylimitedattentionispaidtotheeffectsofnoise，SOthatourinvestigationismorerealisticandCanalsoprovidesomeinstructionsforexperimentalworkAlthoughSRhasbeeninvestigatedextensively，thereareverylimitedstudiesoninternalSR，e

11、speciallyinchemicalandlivingsystemsSincechemicalandlivingsystemsoftenOCCurfarfromequilibriumandshowrichcomplexnonlinearbehaviors，itisexpectedthatinternalSRinthesesystemsisrobustWeholdthatinvestigationsinthesesystemsarehe