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22 Oct 2014: currently active worldwide, 20 might be expected to erupt in any one year.

5 Aug 2014: In just two short years, perovskite-based solar cells have reached efficiencies of nearly 20%, a level which took conventional silicon-based solar cells 20 years.

12 Aug 2014: Cambridge Imaging Systems has been at the forefront of media asset management for 20 years, developing technology used by corporate and government clients including the Ministry of Defence, IMG Sports, the

19 Nov 2014: In Ontario, 20% of government-monitored drinking water systems now come from landscapes containing lakes with depleted calcium concentrations that favour Holopedium, and this is only set to increase.”.

16 Jun 2014: It’s a field of physics that 20 years ago was unknown.

28 Mar 2014: Felix Deschler. Commercial silicon-based solar cells - such as those seen on the roofs of houses across the country - operate at about 20% efficiency for converting the Sun’s rays into ... It’s taken over 20 years to achieve that rate of efficiency.

20 Mar 2014: Share. Published. 20 Mar 2014. Image. Fans of devitrite crystals. Credit: Haider Butt.

3 Feb 2014: Silicon has been proposed as a replacement for carbon in battery anodes (negative electrodes) for the past 20 years, as it has roughly ten times more storage capacity than carbon.

13 Mar 2014: Ends. About Cambridge Science Festival. Now in its 20. th. year, the Cambridge Science Festival gives the public the opportunity to explore Cambridge science.

1 Jul 2014: UCM is also taking the lead in joining up arts and cultural provision across the city, with Curating Cambridge – a five-week programme of cultural events and activities from October 20 –