copper smelting slags are hard materials. therefore,to recover their copper by flotation method, grinding should be carried out to obtain optimal particle size. copper smelting slags in the bardeskan district, with work index of 16.24 kwh/st, were grinded for 65 minutes to reach an acceptable degree of freedom for the flotation tests, with particle size of 80%, smaller than 70 μm. with this gri...

the purpose of this paper is a study on the effect of cash flows on the gap between actual and optimal financial leverage ratio companies listed in tehran stock exchange. in this regard, we try to help with advanced econometric techniques such as partial adjustment model on panel data and generalized method of moments to achieve a reasonable estimate of the impacts.in this paper, were analyzed ...