The structure of the telecommunications industry has changed substantially in the last decade, raising public concern that the quality of our information infrastructure may be adversely affected. This paper extends the standard vertical differentiation model of imperfect competition to address the case of the choice of quality in complex systems. In these systems each demanded good consists of ...

Under the background of new urbanization and industry-city integration (I-C Integ. for short), this paper concerns about the rising phenomenon of large residential area and innovation industry, and suggests that the key of I-C Integ. is co-development of urban service industry with the two formers. Then, this paper reviews the concept of Urban Complex and its relationship with I-C Integ., and c...

Binders are of prime importance in the agglomeration of iron ore concentrates. In this research, strength and density of briquette produced from the magnetite concentrate of Gol-E-Gohar were investigated using different binders at various applied pressures. The results showed that peridor was the most effective binder relative to bentonite and lime. For all types of binders, the increase in bin...

superplastic forming (spf) is a manufacturing process utilized in the automotive industry to produce complex geometry aluminum or magnesium alloy components which cannot be fabricated at room temperature. this paper investigates the effects of the die entry radius and the interfacial friction coefficient on the required forming time and thickness distribution of a superplastic formed part. a co...

the most important environmental pollutant in steel industry is air pollution due to the process of its products. optimise sitting for this industry, in a great extend will prevent pollutants and emissions. khorasan steel company is located near some populous villages and three rivers. it is necessary to perform an investigation for providing abatement and control of air pollution, in time of p...

because of heavy competition between auto manufacturer and the threats of foreign companies, they try to reduce the internal competition and costs by cooperation and merge. estimation about the auto market is affected by supply and demand. the demand depends on two factors: need for new cars and old cars exit. and the supply depends on production capacity and export. key factors that affected o...

the electro discharge machining (edm), one of the methods used in the machining industry and a non-traditional manufacturing method, the electro erosion process does not depend on the hardness of material and offers a way to process materials of very complex geometry with very fine and high precision by using cheap electrode materials, which make it a preferred method. in this study, effect of ...

Whereas public information campaigns have failed to reverse the rising trend in obesity, economists support food taxes as they suggest they can force individuals to change their eating behavior and make the agro-food industry think more about healthy food products. Excise taxes based on the unhealthy nutrient content would be more effective since they impact more on unhealthy food products than...