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pacome delva

Researchers Solve the Mystery of the Zodiacal Light - 0 views

  • Zodiacal light—the faint white glow that stretches across the darkest skies, tracing the same path the sun takes—has mystified scientists for centuries. They've known that it is sunlight reflected from a disk of dust spanning the inner solar system from Mercury to Jupiter. They just didn’t know where the dust came from—until now.
pacome delva

Novel negative-index metamaterial bends light 'wrong' direction - 1 views

  • the first negative index metamaterial to operate at visible frequencies
  • By engineering a metamaterial with such properties, we are opening the door to such unusual -- but potentially useful -- phenomena as superlensing (high-resolution imaging past the diffraction limit), invisibility cloaking, and the synthesis of materials index-matched to air, for potential enhancement of light collection in solar cells
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    I forwarded the link to my experimental colleagues and here is the comment from Sergei (the master himself:) "this is what Igor has been doing - an array of plasmonic nanocables. This basically works as a wire-medium slab. All their epsilon and mu are rubbish." * If Sergei is as strict as in this comment, then it IS rubbish. He's not one of the notorious complainer (as e.g. myself.) * Please DO NOT FORWARD this to anybody else, Sergei's comment is NOT FOR PUBLIC USE!
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    UPDATE: I had a short chat with Sergei and Pekka, Sergei noticed that there is an increasing number of papers on metamaterials, especially in Nature and Science, which are simply wrong, this one being an example. * The idea is based on a very well known effect of wired media. What appears to be interesting about this paper is that they manage to make an optical analogue with aparently low losses. This could be interesting. * The whole interpretation as NIM, "wrong" refraction etc. is total nonsense.
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    wow, good to know ! But for the privacy you should be aware that this is a public group, so anyone has access to our comments i think !
duncan barker

Can WISE find the hypothetical 'Tyche'? - 0 views

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    "In November 2010, the scientific journal Icarus published a paper by astrophysicists John Matese and Daniel Whitmire, who proposed the existence of a binary companion to our sun, larger than Jupiter, in the long-hypothesized "Oort cloud" -- a faraway repository of small icy bodies at the edge of our solar system. The researchers use the name "Tyche" for the hypothetical planet. Their paper argues that evidence for the planet would have been recorded by the Wide-field Infrared Survey Explorer (WISE)."
Joris _

Up telescope! Search begins for giant new planet - 1 views

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    well, he kind-of falls into his own trap: confusing/discussing "evidence" with "likelihood", and "there is" with "it may". He should have made more efforts in his writing, what he says is a bit pointless! (just put the Icarus' paper)
LeopoldS

July 2011: The Future of Energy | Popular Science - 3 views

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    SPS story ...
duncan barker

Flexible Batteries That Never Need to Be Recharged - Technology Review - 2 views

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    European researchers have built prototypes that combine plastic solar cells with ultrathin, flexible batteries.
LeopoldS

SVS Animation 3832 - Extreme Solar Eruption Caught on Camera - 1 views

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    Nice!!
LeopoldS

BBC News - Speed-of-light experiments give baffling result at Cern - 5 views

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    Sante, Luzi have a look at this???!!!
  • ...3 more comments...
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    and here's the xkcd on it: http://xkcd.com/955/
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    And here's the arXiv paper http://arxiv.org/abs/1109.4897 Serious? Difficult to say. I'm theorist and can't really rate their measurement techniques. Certainly be cautious, mostly such things disappear faster than they appeared.
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    it took them 3 years to "appear"!
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    Leo, you mean that they measured 3 years? That's not a point to criticize: since the only interaction of neutrinos with matter is the Weak Interaction (which is indeed very, very weak), it is extremely hard to get a reasonable statistic. By the same reason, it's essentially impossible to shield the experiment from the background. And this background (solar neutrinos, cosmic radiation neutrinos) is huge.
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    for sure a result to be taken seriously. It makes a buzz in my lab... but always be cautious with this kind of declaration, that hugely violates all physics we know and even most of the reasonable alternative theories... Remember the Pionneer anomaly for which it took almost ten years to set up that finally its a thermal effect.
LeopoldS

Profound change of the near-Earth radiation environment caused by solar superstorms - 1 views

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    effects lasting for decades possible apparently ...
andreiaries

YouTube - Mission 3 computer animation - 0 views

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    ARCA is the romanian google X prize competitor.
  • ...1 more comment...
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    They'll probably launch the concept this month. It doesn't look very realistic, but I like the stage separation.
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    I like the 4 stage system. But how did they solve the plume issue ?
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    The plume issue is not that difficult. I think they used something similar on Apollo LES. The problem is stabilizing the entire system, which is extremely difficult. The entire system will most likely plummet down after the solar balloon phase (which is the only phase they tested before). At least they are not using government money :).
Nina Nadine Ridder

Next German gov't to cut solar subsidies - Boston.com - 1 views

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    Only took 2.5 weeks  till they make stupid decisions...
Juxi Leitner

Martian Projects Shall Use Nuclear Energy - 0 views

  • Since current rocket technologies are not sufficient for the future exploration of Mars and the whole Solar system, and since no alternative energy resources have been found as of now, the only possible way to implement those projects would be by using nuclear energy, Lopota said at an academic conference on aerospace.
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    blablabla
pacome delva

Phantom menace to dark matter theory - space - 08 July 2009 - New Scientist - 0 views

  • If MOND exists, it will appear as if there is an anomalous, "phantom" mass in that region, exerting a gravitational force on the bodies in our solar system.
  • According to Milgrom, this force should cause the orbits of the planets to precess - that is, their elliptical orbits around the sun should slowly change their orientation, over time tracing out a pattern like the petals of a flower.
Joris _

$21 Billion Orbiting Solar Array will Beam Electricity to Earth - 0 views

  • The project, to be undertaken by a research group from 16 companies including Mitsubishi Heavy Industries Ltd, aims to spend the next four years developing the technology needed to beam the electricity produced to earth
  • not be commercially viable at today's prices
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