nowadays, many countries view tourism as the best way of promoting culture, making international relations and gaining economic incomes for this reason, tourism has been at focus in many countries which has many recourses for tourism and great capacity for attracting tourists. meanwhile, one of tourism sub-branches is ecotourism, which has a particular compatibility with nature. iran is a count...

Abstract[1] Natural resources as a source of wealth can increase prosperity or impede economic growth.  Empirical studies with different specifications and data are also mixed on whether natural resources are curse or blessing. In fact, the variety of model specifications, measurements, and samples in the empirical literature makes it difficult to generalize the results. In this study, a growth...

Growing concerns about energy security and environmental sustainability have fueled demand for sustainable renewable sources in recent years. Biodiesel, a alternative to conventional fuels, has gained significant attention as potential source of energy. However, the stability biodiesel during storage its susceptibility oxidation remain major challenges. To address these issues, researchers turn...