THE WEEK’S MOST POPULAR CURRENT R&B SONGS ACROSS ALL GENRES, RANKED BY STREAMING ACTIVITY DATA BY ONLINE MUSIC SOURCES TRACKED BY LUMINATE, RADIO AIRPLAY AUDIENCE IMPRESSIONS AS MEASURED BY ...

As the US transducer is a stationary source and receiver ... In the focal zone, the pulse is most narrow and the pulse therefore has higher spatial peak energy. As a consequence, the echoes generated ...