The ability to achieve ecological sustainability and the sustainable development of marine and estuarine ecosystems constitutes a complex major challenge and depends on many driving forces, often conflicting with each other. In particular, there are three major drivers: (a) the search for human well-being, health and safety, (b) the maintenance of ecological sustainability and environmental equ...

In a work of Just, Miller, Scheepers and Szeptycki it was asked whether certain diagonalization properties for sequences of open covers are provably closed under taking finite or countable unions. In a recent work, Scheepers proved that one of the properties in question is closed under taking countable unions. After surveying the known results, we show that none of the remaining classes is prov...

America’s hardwood forests are some of the country’s most important natural resources. Aside from providing the vast majority of timber used in construction and furnishing, as well as over $17 billion in revenue to the state of Indiana alone, they also play a significant ecological role. They provide and ideal habitat for many organism across all kingdoms and phyla. Knowing this, an important q...

Tourism industry has become one of the biggest and dynamic industries in the world, giving a great impetus to the economic development. However, its vulnerability and the crisis management have been the momentous problem. The findings of researches and practices have shown that tourism crisis will possibly take place due to the destruction of system balance, which is similar to the ecological c...

In this paper I describe a cellular automaton model of a multi-species ecosystem, suitable for the study of emergent properties of macroevolution. Unlike majority of ecological models, the number of coexisting species is not fixed. Starting from one common ancestor they appear by “mutations” of existent species, and then survive or extinct depending on the balance of local ecological interactio...

the capitalism free market system is a system that has gone beyond the ideal level and has realized in all over the world. although it has some achievement for mankind, it has lost its function due to its role in destruction of environment. the theoretical bases of this system are lead to this negative operation. the islam universal system is an ideal system that its theoretical bases, that are...

Prevention researchers have found that drinking in different contexts is related to different alcohol problems. Where and with whom people drink affects the types of alcohol-related problems they experience. Consequently, identifying those contexts that result in the greatest number of problems provides a novel opportunity to target new prevention efforts aimed at those contexts. However, ident...

Social-ecological systems’ dynamics challenge institutions and their functions. For a socio-ecological system to be sustainable, a balanced interdependence of societal and ecological systems is vital. Provided the diversity of social-ecological system contexts, different institutional functions are required for sustaining the balanced interdependence of a social-ecological system. In our paper,...