具有脉冲的生态传染病模型周期解的存在性.pdf

具有脉冲的生态传染病模型周期解的存在性.pdf

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1、第27卷第3期纺织高校基础科学学报Vol.27,No.32014年9月BASICSCIENCESJOURNALOFTEXTILEUNIVERSITIESSept.,2014ArticleID:1006‐8341(2014)03‐0315‐07Existenceofperiodicsolutionineco‐epidemicsystemwithimpulsiveeffect112LIUJun‐li,JIAYing,ZHANGTai‐lei(1.SchoolofScience,Xi′anPolytechnicUniversity,Xi′an710048,

2、China;2.SchoolofScience,Chang′anUniversity,Xi′an710064,China)Abstract:Inthispaper,aperiodicsystemwithimpulsiveeffectisinvestigated.ByusingtheFloquettheoryoflinearperiodicimpulsiveequation,thestabilityoftrivialperiodic,semi‐trivialperiodicsolutionandinfection‐freeperiodicsolutio

3、nareobtained.Byusingthecoincidencede‐greetheorytheexistenceofpositiveperiodicsolutionsisobtained.Asufficientconditiontoguaranteethesystemtobepermanentisprovided.Furthermore,numericalanalysisisgiventoconfirmourtheoreticalresults.Keywords:eco‐epidemicmodel;Floquettheory;coinciden

4、cedegreetheoryCLCnumber:O175Documentcode:A[1‐4]Recently,predator‐preymodelwithdiseaseinpreyhasbeenextensivelystudied.Motivatedbytheaboveworks,wewillproposedthefollowingperiodiceco‐epidemicmodelwithimpulsiveeffect:S(t)=S(t)(r痹1(t)-k1(t)(S(t)+I(t)))-(t)S(t)I(t),λI(t)=(t)S(t)I(t)-

5、c(t)I(t)P(t)-(t)I痹(t),λt≠tk,k∈N,δP(t)=P(t)(r痹2(t)-k2(t)P(t))+e(t)I(t)P(t),(1)+S(tk)=(1+hk)S(tk),+I(tk)=(1+lk)I(tk),t=tk,k∈N.+P(tk)=(1+gk)P(tk),Inmodel(1),thetotalpreypopulationisdividedintotwoclasses,thesusceptiblepopulationS(t)andtheinfectedpopulationI(t),andP(t)isthepredatorp

6、opulation.Itisassumedthatthediseaseson‐lyspreadamongthepreypopulationandthepredatoronlypreysontheinfectivepopulation.r1,r2aretheintrinsicbirthratesofthepreyandpredatorpopulation,1/k1and1/k2arethecarryingcapacityofthepreyandpredatorpopulation,istherateoftransmission,isthedeathra

7、teoftheinfλectedprey,theReceiveddate:2013‐11‐22Foundationitem:SupportedbytheNationalNaturalScienceFoundationofChina(11101323);theShaanxiProvincalEd‐ucationGrant(12JK0879)Correspondingauthor:LIUJun‐li(1981‐),female,anativeofPuyangcounty,Henanprovince,associateprofessorofXi′anPol

8、ytechnicUniversity.E‐mail:ztlljl2008@aliyun.com316纺织高校

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