Connotation

Abstract: Faced with problems such as unordered expansion, inefficient utilization, and the decay of old cities in the current urban development process, many scholars have considered introducing land use mix as a coping strategy. However, due to a lack of understanding of the evolution process and the theoretical connotation of land use mix, it fails to guide its role in practice. Therefore, this study summarizes the theoretical evolution of land use mix from four levels: ideological evolution, conceptual model, quantitative measurements, and influential factors and effects. It is found that after decades of evolution, although the land use mix theory initially formed a certain theoretical and methodological system, there are still some gaps or deficiencies that need to be filled or improved: (1) the theoretical framework lags behind the needs of practice; (2) in the process of evolution, the idea of modern land use mix has been given a deeper meaning; (3) the conceptual model still needs to be further improved; (4) the influencing mechanism is still unclear.

Abstract: The coordinated development is the final goal of Energy-Economy-Environment system because of the complicatedly interdependent and interactional relationships among them.Although there have been plenty of researches on system coordination,most of them hardly solve the coordinating problems in the field of complicated social systems.To achieve this purpose,on the basis of the analysis of the concept and connotation of system coordination,this paper redefines the quantitative expression of system coordination and builds a set of coordinating evaluation models for 3E system.Its application testifies that the coordinating evaluation model and the corresponding calculating method can express quantitatively the status of coordinating development of 3E system,which provides the decision gist for strategy making.