From the point of view of urban consumption behavior, urban fresh water consumption could be classified as three types, namely, direct, indirect and induced wat
Land use change in rural China since the 1980s, induced by institution reforms, urbanization, industrializa-tion and population increase, has received more atte
Background Acute myocardial infarction (AMI) is the leading cause of morbidity and disability among Iranian population.Pre-hospital delay is an important cause
Based on dynamic theory of system, agriculture is a complex system composed by element, structure, func-tion and development. Firstly, this paper analyzes their
The existing models of population distribution often focus on the region with a single city or even multiple centers, and lack the detailed explorations of the