objective:  the aim of the research was investigating and visualizing the intellectual structure of thermodynamics subject area based on outputs of iranian scholars of the field indexed in thomson reuters web of science during time span of 1990-2009.   method: the population of the research was all references of the mentioned publications. the sample was the top 1 percent cited scholars of the ...

this paper proposes a new mathematical model for designing and planning postal parcels carriage and postal networks. the objective of postal network designing is to determine the location, size and connection between the postal stations in a city, province or country. in this paper, a kind of multiple locations-allocations hub problem with limited capacity in collecting, distributing and broadc...