Several model are built to search optimummining rate by using optimum control theory for various pur-pose.A numerical method is extracted to assist both planera
A new compound K<sub>6</sub>Ti<sub>2</sub>Nb<sub>14</sub>O<sub>42</sub>was found inthe ternary system K<sub>2</sub>O-TiO<sub>2</sub>-Nb<sub>2</sub>O<sub>5</sub&am