简介:BybuildingupanAIDSmodelofChineseruralresidents,classifiedintofivegroupsbyincome,concludingsixcommodities(services),analysesthediversityofconsumptionbehavioroutofincomedifference.Wedrawthefollowingconclusions:Firstly,thereexistssomedifferencebetweendifferentincomegroupsincommodities(services)consumption.Secondly,increaseoffarmers'incomewillbefavorabletotheenhancementofconsumptionlevelandupgradingofconsumptionstructure.Thirdly,themediumincomegroup,asonespecialmass,featuresatransitionalmainbodyofconsumptionstructure.Finally,thepolicymakersshouldsupportthefarmerswithlowerincomeincompulsoryeducation,suchasmoreandnecessarytransferpayments.
简介:不可思议地使不安的传送对流散开方程的Acoupled系统被考虑。每个方程的领先的条款被一个小积极参数乘,但是这些参数可以有不同大小。系统的答案有重叠并且交往的边界层。这些层的结构被分析,并且这导致是平常的Shishkin网孔的变体的一个piecewise制服网孔的构造。在一个迎风的差别计划被证明几乎一阶精确的这个网孔上,一致地在两个小参数。我们在场数字实验到的结果证实我们的理论结果。
简介:为避免演化算法在求解多峰函数优化问题时对冗余空间的过度搜索,提高差异演化算法的搜索效率,提出一种新的基于空间收缩的种群灭亡差异演化算法(DEESC),通过最优个体收缩可行空间,用均匀设计方法反复初始化种群,并且讨论了DEESC的主要参数敏感问题.