Influence of ultrasonic treatment of activated carbon in cavitation and precavitation regimes on capacitive and pseudocapacitive energy storage in electrochemical super-capacitors - Ya. Venhryn; I. I. Grygorchak; B. P. Bakhmatyuk; Yu. O. Kulyk; S. I. Mudry (Nanosystems, nanomaterials, nanotechnologies, 2013)