Energy – Page 11 – Alternative Energies

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efficiency
December 25, 2015
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Invisibility cloak might enhance efficiency of solar cells

Success of the energy turnaround will depend decisively on the extended use of renewable energy sources. However, their efficiency partly is much smaller than that of conventional energy sources. The efficiency of commercially available photovoltaic cells, for instance, is about 20 percent. Scientists of Karlsruhe Institute of Technology have now published an unconventional approach to increasing the efficiency of the panels. Optical invisibility cloaks guide sunlight around objects that cast shadows on the solar panel.

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Energy
December 25, 2015
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Wind power bodies lament ‘too small’ Spanish tender

Europe’s wind industry has sharply criticised the Spanish government over last week’s 700MW renewables auction – which included 500MW of wind – as being too small to satisfy demand, and warned it leaves the country at risk of missing its 2020 EU targets.

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australia
carbon
December 25, 2015
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Global fossil-fuel emissions predicted to decline for 2015

An international research team reports that the rapid increase in global carbon dioxide emissions from fossil fuels has slowed in the past two years, underlining the need for action to permanently lower emissions.

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acidithiobacillus
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December 24, 2015
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The double life of a bacteria: Living off both iron and pure electricity

The bacterium Acidithiobacillus ferrooxidans can take electrons needed for growth directly from an electrode power source when iron—its already known source of energy—is absent, new research shows. The study shows that A. ferrooxidans can use direct uptake of electrons from an electrode to fuel the same metabolic pathway that is activated by the oxidation of diffusible iron ions.