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2011-11-29 16:51:13

Negative ions play an important role in everything from how our bodies function to the structure of the universe. Scientists from the University of Gothenburg, Sweden, have now developed a new method that makes it possible to study how the electrons in negative ions interact in, which is important in, for example, superconductors and in radiocarbon dating. "By studying atoms with a negative charge, 'negative ions', we can learn how electrons coordinate their motion in what can be compared...

2011-11-18 03:36:07

Like a shadowy character just hidden from view, a mystery atom in the middle of a complex enzyme called nitrogenase had long hindered scientists' ability to study the enzyme fully. But now an international team of scientists led by Serena DeBeer, Cornell assistant professor of chemistry and chemical biology, has pulled back the curtain using powerful synchrotron spectroscopy and computational modeling to reveal carbon as the once-elusive atom. The research was published online Nov. 17...

2011-11-18 03:31:25

If we could make plant food from nitrogen the way nature does, we'd have a much greener method for manufacturing fertilizer — a process that requires such high temperatures and pressures that it consumes about 1.5 percent of the world's energy. Now scientists working at the Department of Energy's SLAC National Accelerator Laboratory have taken an important step towards understanding how nature performs this trick, by identifying a key atom that researchers had sought for more than a...

2011-11-09 22:36:30

Not to pick up electrons, but tweezers made of electrons. A recent paper by researchers from the National Institute of Standards and Technology (NIST) and the University of Virginia (UVA) demonstrates that the beams produced by modern electron microscopes can be used not just to look at nanoscale objects, but to move them around, position them and perhaps even assemble them. Essentially, they say, the tool is an electron version of the laser "optical tweezers" that have become a standard...

2011-11-07 17:01:09

Caltech Engineers Reveal How Scandium Trifluoride Contracts with Heat They shrink when you heat 'em. Most materials expand when heated, but a few contract. Now engineers at the California Institute of Technology (Caltech) have figured out how one of these curious materials, scandium trifluoride (ScF3), does the trick–a finding, they say, that will lead to a deeper understanding of all kinds of materials. The researchers, led by graduate student Chen Li, published their results in...

2011-11-07 16:58:00

A new generation of lighter, stronger plastics could be produced using an intricate chemical process devised by scientists A new generation of lighter, stronger plastics could be produced using an intricate chemical process devised by scientists. Chemists working on the nanoscale — 80,000 times smaller than a hair's breadth — have managed to tie molecules into complex knots that could give materials exceptional versatility. By weaving threads of atoms into the shape of...

2011-11-07 16:45:22

How massless electrons tunnel through energy barriers in a carbon sheet called graphene Electrons moving in graphene behave in an unusual way, as demonstrated by 2010 Nobel Prize laureates for physics Andre Geim and Konstantin Novoselov, who performed transport experiments on this one-carbon-atom-thick material. A review article, just published in EPJ B´, explores the theoretical and experimental results to date of electrons tunneling through energy barriers in graphene. As good an...

2011-10-20 09:31:11

An advanced material that could help bring about next-generation "spintronic" computers has revealed one of its fundamental secrets to a team of scientists from Argonne National Laboratory (ANL) and the National Institute of Standards and Technology (NIST). The material, constructed of two different compounds, might one day allow computers to use the magnetic spin of electrons, in addition to their charge, for computation. A host of innovations could result, including fast memory devices...

Image 1 - Diamonds, Silver And The Quest For Single Photons
2011-10-18 07:56:59

Tiny crystal towers enlighten understanding of photon emission, could inspire diamond microchips for quantum computing Building on earlier work showing how nanowires carved in impurity-laden diamond crystal can efficiently emit individual photons, researchers have developed a scalable manufacturing process to craft arrays of miniature, silver-plated-diamond posts that enable even greater photon control. The development supports efforts to create robust, room-temperature quantum...


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2013-02-17 09:41:03

Image Caption: This icon, known as the "feed icon" or the "RSS icon", was introduced in Mozilla Firefox in order to indicate a web feed was present on a particular web page that could be used in conjunction with the Live bookmarks function. Microsoft Internet Explorer, Opera and some other browsers have adopted the icon in order to promote a de facto standard. Credit: Mozilla/Wikipedia A web feed is a data format that provides the user with regularly updated content. It is also...

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Word of the Day
monteith
  • A large punch-bowl of the eighteenth century, usually of silver and with a movable rim, and decorated with flutings and a scalloped edge. It was also used for cooling and carrying wine-glasses.
  • A kind of cotton handkerchief having white spots on a colored ground, the spots being produced by a chemical which discharges the color.
This word is possibly named after Monteith (Monteigh), 'an eccentric 17th-century Scotsman who wore a cloak scalloped at the hem.'
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