Various systems and techniques are disclosed for stopping, selectively
controlling, and optimizing a flow of particles in a flowing stream. The
systems and techniques utilize a multi-electrode assembly and various
voltage waveforms applied to those electrodes. The particles flow past or
near the electrode assembly and their flow is controlled by the
configuration and arrangement of the electrodes and the voltage waveforms
applied thereto. An additional strategy for countering particle leakage
flow is also described.