These all-time rankings are based on actual performance on the weekly Billboard Hot 100 (from its launch on Aug. 4, 1958 through Oct. 10, 2015) and Billboard 200 (from Aug. 17, 1963 — when we combined ...

Abstract: Piezoelectric ceramic transducers (PCTs) are used as the vibration sources for the ultrasonic cleaner. However, PCTs have a narrow operational region and sensitive to load variation. This ...