Study on land ecological safety can help people acquire the states and changes of land ecosystem. It is of great significance to realize the reasonable utilization of land resource. The paper constructed an evaluation index system of land ecological safety based on Pressure-State-Response model. Then the paper combined fuzzy mathematics and matterelement theory to establish an evaluation model ...

Objectives: The objective behind this study was investigating the relationships between family functioning and psychological hardiness in parents of exceptional children versus parents of normal children. Methods: The study was causal-comparative. Population included all parents of normal and exceptional students in Bojnurd City studying in ordinary and exceptional schools in the academic ye...

Discusses the interaction between socio-economic systems and their natural environment, by examining the indicators of sustainable development. Areas covered by the operationalization of sustainable development indicators; Details on the global nature of environmental problems; Important strategy of the operationalization of sustainable development; Link between economic data and ecological ind...