基于渗透原理的农民工城市空间融入变化规律研究

根据2015~2016年对西安市区农民工调查和访谈的1 200份问卷为基础,结合渗透原理,借助数理统计方法,构建城市空间网络节点模型,分析城市融入动态变化规律。研究得出：①农民工城市空间融入具有渗透和排斥规律,其影响因素涉及软差异实力与硬差异实力在城市空间网络节点上渗透力与排斥力相互作用;②该综合作用的阈值决定农民工在城市空间网络节点上的迁移与逗留时间;③理论数据仿真测试表明基于同心圆理论的城市空间网络节点模型（Logistic）符合农民工城市融入动态位移特征,对城市空间和谐发展有着积极的启示意义。

The Spatial Variation of Migrant Workers' City Integration Based on the Principle of Penetration

Based on interviews and questionnaires of 1 200 more or less rural migrant workers in the city of Xi’an in the interval between 2015 and 2016, a network node model of urban space (USNN) associated with the statistical model is proposed in this research aiming to understanding the integrating principles of rural migrant workers in cities. With the combination the principle of penetration and the application of mathematical statistics method, the principle of penetration ideas is exploited to analyze the dynamic change process involving in rural migrant workers pouring into the cities and towns. Logistic regression is employed to describe the nodes in USNN of dynamic change process which is determined by the the interactions of penetration force and repulsion force each other, and the difference value between the interactions of penetration force is determined the direction of displacement in USNN. The conclusions and results can be drawn as follows: Firstly, the integration into the urban space of rural migrant workers takes on the phenomenon of penetration and migration, the influence factors involve in the interactions of penetration force and repulsion force which depends on the soft and hard difference potential strength; Secondly, the comprehensive threshold value of penetration force and repulsion force is determined by the time interval of migration and residence. In order to explicitly describe the stochastic process of rural migrant workers integrating into the cites and towns, network node model is established to analyze the data, and the principle of penetration is applied in exploring the urban spatial transition energy level of migrant workers in terms of concentric circle model; concentric circle model is consist of different levels whose value is arranged the energy value varying from the maximum to minimum centered at city logic origin. In addition, the statistical model with respect to rural migrant workers in urban space network level node permeation process is employed. Based on these, concepts of the soft and hard difference strength are defined to analyze interaction process of osmotic force and repulsive force on each node in urban space network. For any arbitrary node, concepts of the soft and hard difference strength are defined to analyze interaction process of osmotic force and repulsive force on each node in urban space network. The time of penetrating and migration; the moving routes well fitted with Poisson update process; Finally, Simulation and theoretical data test results demonstrate that the Logistic statistical model associated with nodes inside the network of urban space based on concentric circle theorem coincides with the dynamic displacement characteristics of rural migrant workers integrating into the cites and towns, which have a positive significant meaning effect on the harmonic development of urban space.