Deezer Deezer Deezer is an Internet-based music streaming service. It allows users to listen to music content from record labels including Sony Music, Universal Music Group, and Warner Music Group on various devices online or offline. Created in Paris, France, Deezer currently has 53 million licensed tracks in its library, with over 30,000 radio channels, 14 million monthly active users, and 6 million paid subscribers as of 3 April 2018. The service is available for Web, Android, iOS, Windows Mobile, BlackBerry OS and Windows, MacOS. In 2006, Daniel Marhely developed the first version of Deezer, called Blogmusik, in Paris. Its idea
Shrouded tidal turbine Shrouded tidal turbine The shrouded tidal turbine is an emerging tidal stream technology that has a turbine enclosed in a venturi shaped shroud or duct (ventuduct), producing a sub atmosphere of low pressure behind the turbine. The venturi shrouded turbine is not subject to the Betz limit and allows the turbine to operate at higher efficiencies than the turbine alone by increasing the volume of the flow over the turbine. Claimed improvements vary, from 1.15 to 4 times higher power output than the same turbine minus the shroud. The Betz limit of 59.3% conversion efficiency for a turbine in an