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This week’s most popular songs in Canada across all genres, ranked by radio airplay audience impressions as measured by Nielsen Music, sales data as compiled by Nielsen Music and streaming activity ...

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 ...

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The Official Singles Chart Top 100 reflects the UK’s biggest songs of the week, based on audio and video streams, downloads, CDs and vinyl, compiled by the Official Charts Company. The UK Top 40 is ...

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 ...

Abstract: In some cases of ultrasound nondestructive evaluation, the use of a coupling agent can damage the object being inspected, thus requiring the use of an air-coupled ultrasound transducer. This ...