in this research the simulation of an air independent proton exchange membrane fuel cell (pemfc) propulsion system was taken into consideration. the system consists of several parts including pem fuel cell stack, metal hydride and liquid oxygen (lox) tanks, and also pre-heaters of oxygen and hydrogen gases along with other heat exchangers, to ensure proper operation of system. the heat recovery...

in this research, the efficiency of the comminution circuit as well as the efficiency of size classification equipment of the concentrator plant 2 of sarcheshmeh copper complex was studied. the comminution circuit of this plant includes one sag mill in a closed circuit with a vibrating screen and one ball mill with a size classification system of hydrocyclone. the goal of this work was to calcu...

This article looks at one way of harnessing inexhaustible energy - wind power. The relevance the use farms has been considered, which is due to many factors. most important advantage an source energy, namely air currents, are result pressure differences in atmosphere. Although modern industry mainly based on non-renewable sources (oil, gas and hard coal account for about 80% global balance), in...