A system and method for identifying an object based on its estimated mass. The polysilicon rod contains, surrounding the filament rod, an inner zone having but few needle crystals, small in size, an outer zone having a relatively small amount of larger needle crystals, and a smooth transition zone between the inner and outer zones. The battery management system includes a measuring unit electrically connected to the isolation circuits to turn on or off the isolation circuits and measure voltages simultaneously of the batteries when the isolation circuits are turned on by the measuring unit. When the performance of the permutation exceeds the performance of the original part of the flow graph, the streams manager modifies the flow graph so the permutation replaces the original part of the flow graph.