Congestion and overloading for lines are the main problems in the exploitation of power grids. The consequences of these problems in deregulated systems can be mentioned as sudden jumps in prices in some parts of the power system, lead to an increase in market power and reduction of competition in it. FACTS devices are efficient, powerful and economical tools in controlling power flows through ...

Social play is complicated to study because of its emergent, diverse, and inter-subjective nature. Since social psychology and sociology have studied human interactions in great detail and depth in real life, we propose that they can deepen our understandings of social game experience. Specifically, the interaction ritual theory (IR theory) from Micro-sociology that focuses on moment-to-moment ...

Relations among species in ecosystems can be represented by complex networks where both negative (competition) and positive (mutualism) interactions are concurrently present. Recently, it has been shown that many ecosystems can be cast into mutualistic networks, and that nestedness reduces effective inter-species competition, thus facilitating mutually beneficial interactions and increasing the...

Rangelands renewable resources play a very important role in ecosystem regulating, preserving plant genetic reservoirs, water cycle as well as providing large parts of forage requirements. These resources were considered to be a basis for sustainable development and also a basic platform for various economic activities. During the recent years in Iran, these valuable sources were subjected to s...