In this work we analyze the large-time behavior of a spatially structured economic growth model coupling physical capital accumulation and pollution diffusion. This model extends other results in the literature along different directions. Alongside the classical Cobb–Douglas production function, a convex–concave production function is considered. We add a negative feedback to the production fun...

The paper analyses dynamical growth models predicting the cyclic development of investigated economic factors. provided research deals with an optimal control problem based on model production function Cobb–Douglas type. Following Pontryagin maximum principle, we derived Hamiltonian system and conducted its qualitative analysis, which reveals conditions for behaviour solutions around isolate st...

Herniation of small bowel through the peritoneal defect of the Pouch of Douglas is extremely rare type of internal hernia, and this type of internal hernia has been described as an entity of perineal hernia. Here, we describe a case of a 26-year-old female without history of abdominal surgery presenting with incarcerated small bowel hernia through a peritoneal defect of the Pouch of Douglas. Sh...

background and objectives: pharmaceutical expenditures are responsible for a major part of health systems’ cost. according to the who’s statistics, iran is the first among the 20 countries in the world in terms of drug consumption. the first step in controlling consumption of a particular good is to identify factor inducing the relevant demands. hence, this study aimed to identify the pattern a...

recent studies have shown that firms that have adopted environmental standards and thosethat have obtained official quality certifications achieve higher labour productivity than firms that have notdone so. unlike previous studies, this paper analyzes the combined effect of implementing environmentalgood practices and obtaining quality certifications on apparent labour productivity using a samp...