The homogeneous dispersive Y<sub>2</sub>O<sub>3</sub> particles were melt-doped on the surface of a superalloy by laser alloying and the effect of Y<sub>2</sub>
Our research and investigation proves thatthe growth rate of the productivity of thenonferrous metals industry is much lower thanthat of investment,and that the
The proposed hierarchical arrangement of the copper plant control is presented.The hierar-chical control in copper manufacture and the recent computer advances