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Archive for the ‘science’ Category
Aussie, Finnish Researchers Create a Single-Atom Transistor
Sunday, December 6th, 2009
ACKyushu writes "Researchers from Helsinki University of Technology (Finland), University of New South Wales (Australia), and University of Melbourne (Australia) have succeeded in building a working transistor whose active region comprises only a single phosphorus atom in silicon. The results have just been published in Nano Letters. The working principles of the device are based on sequential tunneling of single electrons between the phosphorus atom and the source and drain leads of the transistor. The tunneling can be suppressed or allowed by controlling the voltage on a nearby metal electrode with a width of a few tens of nanometers."
LHC Knocked Out By Another Power Failure
Wednesday, December 2nd, 2009
known_ID writes "The Large Hadron Collider — the most puissant particle-punisher ever assembled by the human race — has suffered another major power failure, knocking not only the atom smasher itself but even its associated websites offline."
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Royal Society Releases Historic Science Papers
Monday, November 30th, 2009
krou writes "To celebrate its 350th anniversary, the Royal Society has released a number of historic science papers and made them available online via its Trailblazing website. Among the papers are Benjamin Franklin's notes on his kite-flying experiment, a paper on black holes co-written by Professor Stephen Hawking, manuscripts from Sir Isaac Newton showing 'that white light is a mixture of other colours,' and a few other interesting details such as 'a gruesome account of a 17th century blood transfusion.'"
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LHC Reaches Over One Trillion Electron Volts
Monday, November 30th, 2009
The LHC has become the world's highest-energy particle accelerator, weighing in at over one trillion electron volts. "Until now the LHC had been operating at a relatively low energy of 450 billion electron volts. On Sunday, engineers increased the energy of this 'pilot beam,' reaching 1.18 trillion electron volts at 2344 GMT. The previous record of 0.98 trillion electron volts has been held by the Tevatron accelerator since 2001. The LHC is eventually expected to operate at some seven trillion electron volts."
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Tapering Waveguide Captures a Rainbow
Saturday, November 28th, 2009
SubComdTaco passes along news of researchers in the US who have trapped a rainbow in a tapering waveguide. The research is described (PDF) on the arXiv. "In 2007, Ortwin Hess of the University of Surrey in Guildford, UK, and colleagues proposed a technique to trap light inside a tapering waveguide [made of metamaterials]... The idea is that as the waveguide tapers, the components of the light are made to stop in turn at ever narrower points. That's because any given component of the light cannot pass through an opening that's smaller than its wavelength. This leads to a 'trapped rainbow.' ... Now Vera Smolyaninova of Towson University in Baltimore, Maryland, and colleagues have used a convex lens to create the tapered waveguide and trap a rainbow of light. They coated one side of a 4.5-mm-diameter lens with a gold film..., and laid the lens — gold-side down — on a flat glass slide which was also coated with film of gold. Viewed side-on, the space between the curved lens and the flat slide was a layer of air that narrowed to zero thickness where the lens touched the slide — essentially a tapered waveguide. When they shone a multi-wavelength laser beam at the... gilded waveguide, a trapped rainbow formed inside. This could be seen as a series of colored rings when the lens was viewed from above with a microscope: the visible light leaked through the thin gold film."
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