Abstract We review the contribution of “The Log Gravity” (Santos Silva and Tenreyro, Rev Econ Stat 88:641–658, 2006), summarize main results in ensuing literature, provide a brief state-of-the-art estimation gravity equations other constant-elasticity models.

Background: Poisoning is an important public health issue and causes high mortality rate each year worldwide. Having epidemiological information can lead to proper planning for its prevention intervention. Objective: This study aims investigate the one-year prevalence of poisoning in patients received pre-hospital emergency services Ghaemshahr, Mazandaran, Iran. Materials Methods: a descriptive...

resistance of 16 sugar beet cultivars to cercospora leaf spot was evaluated in ghaemshahr region. the experiment was conducted in a complete block design with 6 replications, and, disease severity of cultivars was measured two times. root yield of cultivars, as well as their disease severity, was compared with each other under natural cercospora infection in dezful area (winter crop). in dezful...

This study aimed to investigate the relationship between organizational capabilities and strategic management, competitive advantage of Ghaemshahr computer school employees. research was descriptive correlation type. The statistical population consisted 100 employees in 2017-2018. A sample size 80 people selected by straddle random sampling based on gender. Data measurement tools included stand...