11/12/2013

Nontoxic quantum dot research improves solar cells

Solar cells made with low-cost, nontoxic copper-based quantum dots can achieve unprecedented longevity and efficiency, according to a study by Los Alamos National Laboratory and Sharp Corporation.

The rise and fall of oxygen

How long has Earth's atmosphere included oxygen? A recent paper suggests low levels of oxygen appeared in the atmosphere approximately 2.95 billion years ago. That's about 550 million years earlier than previously thought.

New system makes the VLA "Two telescopes in one"

The Karl G. Jansky Very Large Array (VLA) will get a new system allowing it to continuously monitor the sky to study the Earth's ionosphere and detect short bursts of radio emission from astronomical objects. The National ...

Engineers zap bridges with electricity to test for corrosion

(Phys.org) —Rust is a civil engineer's nightmare. Motorists in the United States make more than 200 million trips across bridges rated structurally deficient or in need of significant maintenance and yearly inspection. ...

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