Videos reveal birds, bats and bugs near Ivanpah solar project power towers
July 27, 2016 04:15 PM - Us Geological Survey via EurekAlert!
Video surveillance is the most effective method for detecting animals flying around solar power towers, according to a study of various techniques by the U.S. Geological Survey and its partners at the Ivanpah Solar Electric Generating System facility in southeastern California.
This study is the first to examine a variety of remote sensing and sampling techniques to determine which technology might be most effective for monitoring how solar power facilities impact flying animals. The information will be used to further study the effects of solar power infrastructure on flying animals -- a subject about which little is known -- and to develop ways to lessen harmful effects.
At Ivanpah, evidence of flying animals impacted by intense heat near the solar towers had been observed. The new study showed that although birds and bats were occasionally seen near the towers at Ivanpah, most observations involved insects.
Montreal households the greenest in Canada: UBC study
July 27, 2016 11:51 AM - University of British Columbia via EurekAlert!
Montreal homes are the most sustainable in the country, and Edmonton's the least, according to a new University of British Columbia study that compares average household greenhouse gas emissions in major cities across Canada.
Using census data over a 12-year span, researchers ranked cities on how much carbon dioxide the average Canadian family (two to three people) with an annual income of $81,000 in each city produced in a year from the combined use of electricity, gasoline and natural gas.
The average Montreal household produces five tonnes of GHG per family per year, while the average Edmonton household emits 20 tonnes per family per year.
Current atmospheric greenhouse gas concentrations likely commit to warmings greater than 1.5C over land
July 27, 2016 10:20 AM - Centre for Ecology & Hydrology
Current levels of atmospheric greenhouse gas concentrations already commit the planet to air temperatures over many land regions being eventually warmed by greater than 1.5°C, according to new research published today (27 July 2016) in the journal Scientific Reports.
The results of the new study have implications for international discussions of what constitutes safe global temperature thresholds, such as 1.5°C or 2°C of warming since pre-industrial times. The expected extra warming over land will influence how we need to design some cities. It could also impact on the responses of trees and plants, and including crops.
The research was carried out by scientists from the UK's Centre for Ecology & Hydrology and the University of Exeter, UK.
The research team found two main reasons behind the result.
Silicon-air battery achieves running time of over 1,000 hours for the first time
July 26, 2016 03:48 PM - Forschungszentrum Juelich via ScienceDaily
Silicon-air batteries are viewed as a promising and cost-effective alternative to current energy storage technology. However, they have thus far only achieved relatively short running times. Jülich researchers have now discovered why.
In theory, silicon-air batteries have a much higher energy density and are also smaller and lighter than current lithium-ion batteries. They are also environmentally friendly and insensitive to external influences. Their most important advantage, however, is their material. Silicon is the second most abundant element in the Earth's crust after oxygen: it is cheap and its reserves are practically inexhaustible.
Biological wizardry ferments carbon monoxide into biofuel
July 26, 2016 02:27 PM - Cornell University via EurekAlert!
Cornell University biological engineers have deciphered the cellular strategy to make the biofuel ethanol, using an anaerobic microbe feeding on carbon monoxide - a common industrial waste gas.
"Instead of having the waste go to waste, you make it into something you want," said Ludmilla Aristilde, assistant professor in biological and environmental engineering. "In order to make the microbes do our work, we had to figure out how they work, their metabolism."
Aristilde collaborated with her colleague Lars Angenent, professor of biological and environmental engineering, on the project. She explained, "The Angenent group had taken a waste product and turned it into a useful product."
To make biofuel from inorganic, gaseous industrial rubbish, the researchers learned that the bacterium Clostridium ljungdahlii responds thermodynamically - rather than genetically - in the process of tuning favorable enzymatic reactions.
Researchers printed energy producing photographs
July 26, 2016 10:52 AM - Aalto University via EurekAlert!
Solar cells have been manufactured already for a long from inexpensive materials with different printing techniques. Especially organic solar cells and dye-sensitized solar cells are suitable for printing.
-We wanted to take the idea of printed solar cells even further, and see if their materials could be inkjet-printed as pictures and text like traditional printing inks, tells University Lecturer Janne Halme.
When light is absorbed in an ordinary ink, it generates heat. A photovoltaic ink, however, coverts part of that energy to electricity. The darker the color, the more electricity is produced, because the human eye is most sensitive to that part of the solar radiation spectrum which has highest energy density. The most efficient solar cell is therefore pitch-black.
Solar Impulse Just Completed Its Momentous Flight Around the World
July 26, 2016 10:28 AM - Aarian Marshall via Wired.com
Solar Impulse 2 touched down in Abu Dhabi today, becoming the first fuel-free plane to successfully circumnavigate the globe. OK, so the 22,000-mile trip took a minute: The solar-powered bird lifted off from the same city in March 2015. But despite a few setbacks, the plane and Swiss pilot Bertrand Piccard (who took shifts with fellow flyer André Borschberg) touched down without incident.
Solar Impulse 2 is a seriously nifty machine. Its 236-foot wingspan makes it wider than a Boeing 747, but the thing is just 5,000 pounds. 17,000 rigid, photovoltaic panels charge four uber-efficient batteries, which make up nearly a third of the weight. Its four 17.4-horsepower motors definitely aren’t the fastest: The plane tops out around 90 mph, and traveled at an average of 38 mph across the Pacific. (Yeah, we’d honk at it on the highway, too.)
Global Economy Has Reduced Its Energy Intensity by One-Third Since 1990
July 25, 2016 01:41 PM -
The global economy is becoming less energy intensive, using fewer fossil fuels to power productivity and economic growth, according to new data from the U.S. Department of Energy. Global energy intensity — a measure of energy consumption per unit of gross domestic product (GDP) — has decreased nearly one-third since 1990, the agency said. The U.S., for example, burned 5,900 British thermal units per dollar of GDP in 2015, compared to 6,600 BTUs in 2010.
Unlocking the secret to cheaper solar power
July 25, 2016 01:23 PM - American Institute of Physics (AIP) via ScienceDaily
As climate change garners more attention around the world, scientists at the University of Virginia and Cornell University have made critical advances in understanding the physical properties of an emerging class of solar cells that have the potential to dramatically lower the cost of solar energy.
Solar cells remain a focal point of scientific investigation because the sun offers the most abundant source of energy on earth. The concern, however, with conventional solar cells made from silicon is their cost. Even with recent improvements, they still require a significant amount of electricity and industrial processing to be manufactured.
In 2009, energy researchers turned their attention to a class of materials called "metal halide perovskites," or MHPs. They are sprayed on like paint onto solid objects, says Joshua Choi, an assistant professor of chemical engineering at the University of Virginia. As the solution dries, the MHPs crystallize into a thin film that can be used to capture energy in a solar cell.
New lithium-oxygen battery greatly improves energy efficiency, longevity
July 25, 2016 12:31 PM - Massachusetts Institute of Technology via EurekAlert!
Lithium-air batteries are considered highly promising technologies for electric cars and portable electronic devices because of their potential for delivering a high energy output in proportion to their weight. But such batteries have some pretty serious drawbacks: They waste much of the injected energy as heat and degrade relatively quickly. They also require expensive extra components to pump oxygen gas in and out, in an open-cell configuration that is very different from conventional sealed batteries.
But a new variation of the battery chemistry, which could be used in a conventional, fully sealed battery, promises similar theoretical performance as lithium-air batteries, while overcoming all of these drawbacks.
The new battery concept, called a nanolithia cathode battery, is described in the journalNature Energy in a paper by Ju Li, the Battelle Energy Alliance Professor of Nuclear Science and Engineering at MIT; postdoc Zhi Zhu; and five others at MIT, Argonne National Laboratory, and Peking University in China.