he main purpose of this research is to answer the question that "How neighborhood of Iran's trading partners will have an effect on Iran intra-industry trade? For this purpose, the impact of spatial neighborhood effects of 23 major trade partners on Iran’s intra-industry trade for the period of 1995-2014, has been investigated through Spatial Panel Econometric and Maximum Likelihood Estimator (...

there is a close connection between saltwater intrusion into aquifers and groundwater extraction. freshwater extraction in coastal aquifers is one of the most important reasons for the saltwater intrusion into these aquifers. condition of extraction system such as well depth, discharge rate, saltwater concentration and etc. could affect this process widely. thus, investigating different extract...

chemical vapor deposition (cvd) is one of the most important methods for producing carbon nanotubes (cnts). in this research, a numerical model, based on finite volume method, is investigated. the applied method solves the conservation of mass, momentum, energy and species transport equations with aid of ideal gas law. using this model, the growth rate and thickness uniformity of produced cnts,...

Natural radioactivity is responsible for most of the total radiation dose received by human population. Geological materials used in building industry usually become contaminated with naturally occurring radioactive materials. They are used as mixtures in building industry (kaolin, zircon, frit, feldspar) or mechanically processed and used for covering floors and walls of the rooms (granite). I...

in the economic literature, firm entry and exit are considered as two basic concepts and the time interval between them, known as life duration, is almost a neglected subject in iranian economy. accordingly, this study tries to investigate the life duration of new firms in food and beverage industry as one of the most manufacturing industries in iran during 1996-2005. factors affecting the life...