Deezer France. Almost immediately after the partnership began, the rate of users signing up for Deezer's premium services went from 6,000 a month to 100,000; by January 2011, 500,000 people were subscribing to the service, with the million-subscriber mark reached in the middle of 2011, half a year ahead of schedule. The two companies expanded their partnership in September 2011 to include Orange contract customers in the United Kingdom. Also in September, Deezer added Facebook integration to its service, allowing users to send music to one another via that social media service. Deezer was launched in France in 2007. On 7
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