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The grinding process in ball mills is notoriously known to be highly inefficient: only 1 to 2% of the inputted electrical energy serves for creating new surfaces. 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HIGH ENERGY BALL MILLS HIGH ENERGY.BALL MILLS.GRINDING AND PARTICLE SIZING.ON A NANOSCALE.PLANETARY BALL MILL.PM 400.HIGH ENERGY BALL MILL.Emax.of the basic element.Due to the different atom diameters,the lattice in the mixed crystals is distorted,the slip planes are disturbed and the metal becomes harder Cycloconverter CCVs are used for driving mine hoists,rolling mill main motors,ball mills for ore processing,cement kilns,ship propulsion systems,slip power recovery wound rotor induction motors (i.e.Scherbius drives) and aircraft 400 Hz power generation.The variable frequency output of a cycloconverter can be reduced essentially to zero. 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