one of the most important dimention of the industrial structure is the concentration. in order to determine concentration in iranian industries from 2000 to 2005, the 5-firm concentration ratio is used in terms of sale value, production, value added and employment variables. the results indicate high correlation among concentration ratios in terms of sale, employment, value added and production...

manufacture of coke, refined petroleum products and nuclear fuel is one of the isic (international standard industrial classification of all economic activities, rev.2) that produced 8.5 percent of industry value-added in iran in 2007. isfahan, tehran, khuzestan, hormozgan, and markazi provinces accounted for 90 percent of the value added in this sector. to determine competitive advantage in th...

various traditional and industrial coke making techniques were discussed based on their limitations and production capacities, and the criteria such as the quality and size of coke production, amount of coke crumb, amount of investment, amount of operational costs, labor force and mechanization. in this work, the rankings of various traditional and industrial coke making techniques were carried...

Coke strength is the most important characteristic for retaining permeability in the bed of a blast furnace. In the present study, coke was coated with phenolic resin in order to improve the coke strength, and a nanoindentation method was used to estimate the strength of the coated coke after reaction under CO2 atmosphere. The elastic modulus was measured for the microporous coke substrate,. Th...

To decrease the operating cost of flue gas purification technologies based on carbon-based materials, the adsorption and regeneration performance of low-price semi-coke and activated coke were compared for SO2 and NO removal in a simulated flue gas. The functional groups of the two adsorbents before and after regeneration were characterized by a Fourier transform infrared (FTIR) spectrometer, a...

the kinetics of catalyst deactivation and coke formation during dehydrogenation of propane over supported pt–based catalysts and, in particular, the effect of alkali metal promoters on catalyst activity and stability were studied. the analysis of propane conversion data showed that there is an optimum level of alkali metal promoter loading for both catalyst activity and stability.a model based ...