The study of the roles and functions of cities and their developments is an important question in modern geographic studies. The unbalanced spatial distribution of populations, irregular migration to metropolises and imbalances in the distribution of economic opportunities between regions have led to focus on the idea of ​​medium-sized cities as one of the most effective approaches to planning ...

Power as an institution, governance as structure and spatial organization is considered as an organizational tool in the service of the goals and aspirations of the institutions of power and governance structure. In this framework the spatial organization and geographic environment is a result of social organization (social, economic, political), and its natural and ecological system. Human aut...

in this thesis, structural, electronical, and optical properties of inverse pervskite(ca3pbo) in cubic phase have been investigated.the calculation have been done based on density functional theory and according to generalized gradiant approximate (gga) as correlating potential. in order to calculate the configurations, implementing in the wien2k code have been used from 2013 version. first of ...