articles

In recent years, perovskites have taken the solar cell industry by storm. They are cheap, easy to produce and very flexible in their applications. Their efficiency at converting light into electricity has grown faster than that of any other material – from under four percent in 2009 to over 20 percent in 2017 – and some experts believe that perovskites could eventually outperform the most common solar cell material, silicon. But despite their popularity, researchers don’t know why perovskites are so efficient.

Now experiments with a powerful “electron camera” at the Department of Energy’s SLAC National Accelerator Laboratory have discovered that light whirls atoms around in perovskites, potentially explaining the high efficiency of these next-generation solar cell materials and providing clues for making better ones.

It might seem like a tomato plant and a subway system don’t have much in common, but both, it turns out, are networks that strive to make similar tradeoffs between cost and performance.

Using 3D laser scans of growing plants, Salk scientists found that the same universal design principles that humans use to engineer networks like subways also guide the shapes of plant branching architectures. The work, which appears in the July 26, 2017, issue of Cell Systems, could help direct strategies to increase crop yields or breed plants better adapted to climate change.

Coastal mangroves are among the most imperiled ecosystems on earth, with current estimates indicating that up to 67 per cent have been lost to date – according to the United Nations science wing.

“The stakes are high, because mangrove ecosystems provide benefits and services that are essential for life,” said Irina Bokova, Director-General of the UN Educational, Scientific and Cultural Organization (UNESCO) in a message on the International Day for the Conservation of the Mangrove Ecosystem.

When the NASA-NOAA Suomi NPP satellite passed over the Eastern Pacific Ocean on July 25 it captured a visible close-up of Hurricane Hilary.

The Visible Infrared Imaging Radiometer Suite (VIIRS) instrument aboard the NASA-NOAA Suomi NPP satellite captured a visible light image of Hilaryon July 25 at 5:54 p.m. EDT (2154 UTC). The Suomi NPP image showed that Hilary appeared somewhat asymmetric.

The world lost nearly 49 million acres of forest in 2015 to logging, wildfires, palm oil plantations, and other development activity, according to new data by the conservation group Global Forest Watch. That is equal to an area roughly the size of Nebraska, Climate Central reported.