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pacome delva

Invisibility cloaks shield the large and visible - physicsworld.com - 1 views

  • Two independent groups of physicists have built invisibility cloaks that can shield large objects lying on a plane. These "carpet cloaks" are far closer to the intuitive idea of an invisibility cloak than devices previously built, they argue, because they hide objects that can be seen with the naked eye and do so at visible wavelengths. The cloaks are also relatively cheap and easy to make, being constructed from the natural material calcite.
  • The team used a technique known as transformation optics to design their cloak.
  • Tomas Tyc of Masaryk University in the Czech Republic, who was not a member of either group, thinks that the papers "describe important achievements in the area of experimental cloaking." But he maintains that a carpet cloak is quite different to a fully fledged Harry Potter-style invisibility cloak. He points out that a carpet cloak only really works when viewing an object – be it a rucksack or a sword on someone's back, for example – side on. Otherwise the object will appear flat but still be visible.
Dario Izzo

breakthrough in number theory! sequence of partition number unveiled - 2 views

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    I wonder if threre are consequences in cryptography
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    Could be worth to look for a bridge to Santilli's Isonumber Theory.
Luís F. Simões

The Fantastical Promise of Reversible Computing  - Technology Review - 2 views

  • Reversible logic could cut the energy wasted by computers to zero. But significant challenges lie ahead.
  • By some estimates the difference between the amount of energy required to carry out a computation and the amount that today's computers actually use, is some eight orders of magnitude. Clearly, there is room for improvement.
  • There are one or two caveats, of course. The first is that nobody has succeeded in building a properly reversible logic gate so this work is entirely theoretical. But there are a number of computing schemes that have the potential to work like this. Thapliyal and Ranganathan point in particular to the emerging technology of quantum cellular automata and show how their approach might be applied.
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  • Ref: arxiv.org/abs/1101.4222: Reversible Logic Based Concurrent Error Detection Methodology For Emerging Nanocircuits
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    We did look at making computation powers more efficient from the bio perspective (efficiency of computations in brain). This paper was actually the base for our discussion on a new approsach to computing http://atlas.estec.esa.int/ACTwiki/images/6/68/Sarpeshkar.pdf and led to several ACT internal studies
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    here is the paper I told you about, on the computational power of analog computing: http://dx.doi.org/10.1016/0304-3975(95)00248-0 you can also get it here: http://www.santafe.edu/media/workingpapers/95-09-079.pdf
Francesco Biscani

Why I don't care very much about tablets anymore - 5 views

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    There it goes :)
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    "So a new tablet will never be exciting the way that a new, luxury gel ink pen will be exciting" Man, I immediately felt like ordering some new luxury gel ink pens!
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    like also this one: "Some of the really savvy new media efforts like Flipboard are exciting, but after the initial "wow" factor wears off, these apps mainly serve to remind me that there's already too much good stuff to read out there, and that my life is slipping away from me in an infinite stream of interesting bits about smart animals, dumb criminals, outrageous celebs, shiny objects, funny memes, scientific discoveries, economic developments, etc.. I invariably end up closing the app in a fit of guilt, and picking up one of the truly fantastic dead tree or Kindle books that I'm working my way through at the moment, so that I can actually exercise my brain (as opposed to simply wearing it out)."
Isabelle DB

the World Wide Web for robots - 4 views

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    Will they need humans anymore?
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    the coordinators of this FP7 are in Eindhoven ... might be nice to check where they are at one of their next consortium conferences: next one apparently in July but no date given. Guido: could you check?
pacome delva

Atomic clock is smallest on the market - 2 views

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    Soon caesium in your watch !
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    very nice indeed ... how much more accurate are our galileo clocks?
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    This small clock is around 10^-12 @1d in stability (loose 1 second after 300000 years) and 50 ns in accuracy. For comparison Galileo and GPS clocks are around 10^-14 @1d in stability and 1 ns in accuracy. And ACES/PHARAO will be around 3*10^-16 @1d in stability and 0.3 ps accuracy.
santecarloni

On Curing Everything § SEEDMAGAZINE.COM - 2 views

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    Kary Mullis offers a radical new way to treat infectious diseases as the effectiveness of our current antibiotics wanes
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    The thing I like about it is that, if I got it right, the last flu infection you had may safe your live once you get cancer... Similar holds for any kind of infection, as long as you got immune to a specific virus and the doctors are able to identify (and reproduce) the virus to which you are immune.
santecarloni

Single-cell biological lasers : Nature Photonics : Nature Publishing Group - 0 views

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    Here, we show that fluorescent proteins4, 5 in cells are a viable gain medium for optical amplification, and report the first successful realization of biological cell lasers based on green fluorescent protein (GFP).
santecarloni

Three-Dimensional Plasmon Rulers - 0 views

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    "Plasmon rulers can be used to determine nanoscale distances within chemical or biological species. They are based on the spectral shift of the scattering spectrum when two plasmonic nanoparticles approach one another.... We demonstrated a three-dimensional plasmon ruler that is based on coupled plasmonic oligomers in combination with high-resolution plasmon spectroscopy. This enables retrieval of the complete spatial configuration of complex macromolecular and biological processes as well as their dynamic evolution."
LeopoldS

NASA - 2011 NIAC Phase I Selections - 7 views

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    very nice selection of projects by NIAC!! there are at least some who have European partners as it looks like ... lets still see if we can get involved ...
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    Interesting. Is it NASA's equivalent of ESA's GSP?
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    It is a good thing NIAC is alive again. Wie, Bong -> "Optimal Dispersion of Near-Earth Objects" . I wonder what it is?
santecarloni

Cubic neutrons might find it hip to be square - physicsworld.com - 2 views

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    Who said that particles are round?
jmlloren

The British Wildlife Photography Awards 2011 - Telegraph - 2 views

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    Excellent photo gallery.
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    Thanks for sharing! Most pics are very very nice, but a few are actually pretty mediocre I must say... "Wildlife" photography is always a rather tricky topic, as demonstrated by this famous story: http://news.bbc.co.uk/1/hi/8470962.stm
Dario Izzo

Nobel Laureate Ivar Giaever Quits Physics Group over Stand on Global Warming - International Business Times - 1 views

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    mmm .. people are making a lot of overstatments on the issue ....
nikolas smyrlakis

Why We Love to Hate Awards - Freakonomics Blog - NYTimes.com - 0 views

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    [spam] Obama expressed his disappointment recently when rapper Kanye West stormed the stage at the MTV Video Music Awards to protest singer Taylor Swift's win of the "Best Female Video" trophy. Soon after, Obama himself was Swifted by critics who felt he was undeserving of his Nobel Prize win. It is obviously connected to the study of the Journal of Wine Economics that wine gold awards are given randomly http://www.wine-economics.org/journal/content/Volume4/number1/Full%20Texts/1_wine%20economics_vol%204_1_Robert%20Hodgson.pdf which also raised some controversy
LeopoldS

Map of the Day - National Geographic Magazine - 2 views

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    nice representation of where "we went"
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    Can't find the Lagrange points missions...
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    you are right - they are not there ...
Tobias Seidl

Cheetah, Gecko and Spiders Inspire Robotic Designs | Gadget Lab | Wired.com - 1 views

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    Bio-inspired robots. Cockroaches are also in.
nikolas smyrlakis

YouTube - Piano stairs - TheFunTheory.com - Rolighetsteorin.se - 0 views

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    Changing people's behaviour through fun. Looks a bit naive, but if there are any ideas http://www.thefuntheory.com there's an ongoing competition until the 15th of Nov.
LeopoldS

Tilera Corporation - 2 views

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    who wants 100 cores ... future of PAGMO?
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    Well nVidia provides 10.000 "cores" in a single rack on thei Teslas...
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    remember that you were recommending its purchase already some time ago ... still strong reasons to do so?
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    The problem with this flurry of activity today regarding multicore architectures is that it is really unclear which one will be the winner in the long run. Never understimate the power of inertia, especially in the software industry (after all, people are still programming in COBOL and Fortran today). For instance, NVIDIA gives you the Teslas with 10000 cores, but then you have to rewrite extensive parts of your code in order to take advantage of this. Is this an investment worth undertaking? Difficult to say, it would certainly be if the whole software world moves into that direction (which is not happening - yet?). But then you have other approaches coming out, suche as the Cell processor by IBM (the one on the PS3) which has really impressive floating point performance and, of course, a completely different programming model. The nice thing about this Tilera processor seems to be that it is a general-purpose processor, which may not require extensive re-engineering of existing code (but I'm really hypothesizing, since the thechincal details are not very abundant on their website).
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    Moreover PaGMO computation model is more towards systems with distributed memory, and not with shared memory (i.e. multi-core). In the latter, at certain point the memory access becomes the bottleneck.
nikolas smyrlakis

Global Warming To Bring More Rain To Taiwan - Science News - redOrbit - 2 views

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    An interesting aspect of global warming..Was thinking of that today and apparently there are some studies but very limited.Involves a lot of satellite data to measure also moisture etc. in the atmoshpere
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