February 26, 2015
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Biomass Emits Double The CO2 Of Gas .
A blog post about the CO2 emissions caused by the use of American wood fuel to power former coal to electric powerplant.
But it appears to me that author missed the real point. The burning of American wood fuel in British power plant is a major win for the English Ecoloons! NO! CO2 emissions at all!
“In reporting emissions the UK follows the requirements of IPCC guidelines on International Greenhouse Gas reporting. In order to avoid double counting of emissions and removals, the reporting convention is that the CO2 contained within biological materials, such as wood pellets, which are to be burnt for energy purposes, such as electricity generation, is accounted for by the harvesting country. This emission is reported by countries included under the forest management sector.”
Any emissions in collection, transport and combustion count against the Americans and the Americans are not allowed to count their forests towards sequestering the CO2. The British Drax plant generates electricity and has NO countable emissions of CO2. What is not to like? pg
February 25, 2015
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Researchers Make Magnetic Graphene
UC Riverside research could lead to new multi-functional electronic devices
By Iqbal Pittalwala on January 26, 2015
Graphene is a one-atom thick sheet of carbon atoms arranged in a hexagonal lattice. UC Riverside physicists have found a way to induce magnetism in graphene while also preserving graphene’s electronic properties. Image credit: Shi Lab, UC Riverside.
RIVERSIDE, Calif. – Graphene, a one-atom thick sheet of carbon atoms arranged in a hexagonal lattice, has many desirable properties. Magnetism alas is not one of them. Magnetism can be induced in graphene by doping it with magnetic impurities, but this doping tends to disrupt graphene’s electronic properties.
Now a team of physicists at the University of California, Riverside has found an ingenious way to induce magnetism in graphene while also preserving graphene’s electronic properties. They have accomplished this by bringing a graphene sheet very close to a magnetic insulator – an electrical insulator with magnetic properties.
“This is the first time that graphene has been made magnetic this way,” said Jing Shi, a professor of physics and astronomy, whose lab led the research. “The magnetic graphene acquires new electronic properties so that new quantum phenomena can arise. These properties can lead to new electronic devices that are more robust and multi-functional.”
The finding has the potential to increase graphene’s use in computers, as in computer chips that use electronic spin to store data.
Study results appeared online earlier this month in Physical Review Letters.
The magnetic insulator Shi and his team used was yttrium iron garnet grown by laser molecular beam epitaxy in his lab. The researchers placed a single-layer graphene sheet on an atomically smooth layer of yttrium iron garnet. They found that yttrium iron garnet magnetized the graphene sheet. In other words, graphene simply borrows the magnetic properties from yttrium iron garnet.
Magnetic substances like iron tend to interfere with graphene’s electrical conduction. The researchers avoided those substances and chose yttrium iron garnet because they knew it worked as an electric insulator, which meant that it would not disrupt graphene’s electrical transport properties. By not doping the graphene sheet but simply placing it on the layer of yttrium iron garnet, they ensured that graphene’s excellent electrical transport properties remained unchanged.
In their experiments, Shi and his team exposed the graphene to an external magnetic field. They found that graphene’s Hall voltage – a voltage in the perpendicular direction to the current flow – depended linearly on the magnetization of yttrium iron garnet (a phenomenon known as the anomalous Hall effect, seen in magnetic materials like iron and cobalt). This confirmed that their graphene sheet had turned magnetic.
Shi was joined in the study by UC Riverside’s Zhiyong Wang (first author of the research paper), Chi Tang, Raymond Sachs and Yafis Barlas.
Grants to Shi and his team members from the U.S. Department of Energy and the National Science Foundation supported the research.