简介：AccordingtoChinaNewsNet,alarge-scalebirthcohortstudy,inlinewithinternationalnorms,willbestartedinthesecondhalfthisyearinShanghai,andinfullexpandsnextsummer.ItisreportedthattheprojectwillbeledbyProfessorZhangJun,directorofDepartmentofEnvironmentandChildren'sHealthofShanghaiXinhuaHospitalandShanghaiKeyLaboratory.

简介：Inthispaper,basedonsurveydataoffourcities,migrantpopulationin2008,weusemulti-levelLogitmodeltoanalyzethefactorsofindividualandareasofdestinationwhichhaveimpactonmigrationbehaviorofmigrantpopulationinlargecities.Wefindthattherearelargechangesinthebehaviorofmigrants:Firstly,theriseintheproportionofmigrantcitizenshasledtotheeffectsofgender,maritalstatusandhouseholdtypeandotherfactorsontheprobabilityofmigrationarenotsignificant,andthemigrationisappearingtobaseonthefamilyunit;Secondly,duetothediscriminationagainstmigrantsinemploymentandwageincome,andtheupgradeofindustrialstructure,theattractivenessoftheincreasingjobstothemigrantpopulationhasdeclined,andmigrants,expectedincomeisdetachingfromtheincomelevelofurbanresidents;Thirdly,thegrowthofurbanladors,averagewagehasextrusioneffectontheemploymentofthemigrantlaborsintheinformalsector,whichreducestheprobabilityofpotentialmigrantpopulation.