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pacome delva

Can Google Predict the Stock Market? - ScienceNOW - 2 views

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    in related news: Twitter Mood Predicts The Stock Market "An analysis of almost 10 million tweets from 2008 shows how they can be used to predict stock market movements up to 6 days in advance" http://www.technologyreview.com/blog/arxiv/25900/ http://arxiv.org/abs/1010.3003
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    not overly impressive: "The Google data could not predict the weekly fluctuations in stock prices. However, the team found a strong correlation between Internet searches for a company's name and its trade volume, the total number of times the stock changed hands over a given week."
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    Likewise, I can predict the statistical properties of white noise :-)
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    the problem is that usually the google search queries and the twitter updates happen after a crisis for example. I dont really think that people all over the world suddenly realised that Lehman would collapse and started googling it like crazy before it collapsed. More likely they did it afterwards.
Joris _

YouTube - Ascent - Commemorating Shuttle - 2 views

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    An amazing compilation of slow motion videos of the space shuttle. Superb!
Joris _

Orbiting Dust Storm Could Remove Space Junk - 6 views

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    A good example of how loosing perspective makes so-called "novel ways" actually "rubish ways"
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    here the paper: http://arxiv.org/abs/1104.1401 well spent defence funding ....
santecarloni

Vision of beauty - physicsworld.com - 6 views

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    "As sensors in digital cameras fast approach the 127 megapixels of the human eye, clinical trials are under way to implant this technology directly into the retina".
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    Wow
Juxi Leitner

ESA Servers Hacked - 11 views

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    uups :)
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    whoops indeed
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    sounds really bad ... how bad is it???
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    Heads will fall in ESRIN... And now I know who crashed my computations on sophia ;-) [Edit] A lesson for everyone: look at the file with email passwords and see how many you are able to guess even though they're supposed to be scrambled by removing a middle part... [Edit] And a hilarious quote from the hacker's "about me": "I had another blog, more exactly www.tinkode.baywords.com but I forgot the password, so now I created this one."
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    got the reply from IT security today: they had dealt with apparently the very same day and all under control :-)
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    Well, I wouldn't expect a reply: "all our past emails have been downloaded and sold to NASA" even if that was the case.
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    Of course Marek is right... What matters is the theatre of security, not security itself. Just like in airports :)
santecarloni

Aircraft punch holes in clouds and make it rain - physicsworld.com - 2 views

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    Altering local weather?
Marion Nachon

NASA research offers new prospect of water on Mars - 4 views

NASA scientists are seeing new evidence that suggests traces of water on Mars are under a thin varnish of iron oxide, or rust, similar to conditions found on desert rocks in California's Mojave Des...

started by Marion Nachon on 02 Jul 11 no follow-up yet
LeopoldS liked it
Francesco Biscani

Former Google CIO says business misses key people marks | ITworld - 2 views

  • There is a whole cottage industry of people talking about innovation, including all kinds of garbage
  • the more project management you do the less likely your project is to succeed
  • Everyone knew we shouldn't build our own hardware as it was 'dumb', but everyone was wrong.
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  • Just because you can do something with technology that doesn't mean you should do something with technology,
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    Some juicy sound bites from the former Google CIO.
Ma Ru

One Per Cent: Build your own gadget with Microsoft's Lego for adults - 6 views

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    Surprisingly cool initiative from Microsoft...
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    Nintendo did the same a few years ago with the Gameboy Advance and a FPGA module ... very easy to use, very instructive, and a lot of fun (i was a geek!)
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    very nice indeed!
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
LeopoldS

Graphite + water = the future of energy storage - Monash University - 6 views

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    any idea how this works - who wants to have a closer look at it?
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    Water is used for keeping the graphene stacks separate. Without water or some other separation method the different graphene stacks would just stick together and graphene would lose its nice properties (like a huge surface). So, water has nothing to do with energy but is just the material which keeps the graphene stacks at distance. The result is a gel. Still, energy needs to be stored in the gel.
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    and the different graphene layers act as anodes and cathodes??
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    Layer orientation in a gel is random. Additionally to that, cathodes and anodes are about charge seperation. Graphene layers are (as far as I understand) supposed to provide huge surfaces to which something, maybe a charge, can be attached. So do we need ions and electrons? Probably not. Probably just electrons which can travel easily through the gel. I guess the whole gel (and all layers inside) would be nagtively charged, making the gel blob a fluid cathode. But again, it's just a guess.
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    Wouldn't it be worth having a closer look?
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    it's still not clear to me how to get electricity in and out of this thing?
pacome delva

Butterfly lights the way to better thermal imaging - physicsworld.com - 6 views

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    so what about a space sensor for measuring thermal efficiency of buildings? Can you have a look ?
Marion Nachon

Complexity Analysis of the Viking Labeled Release Experiments - 6 views

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    The only extraterrestrial life detection experiments ever conducted were the three which were components of the 1976 Viking Mission to Mars. Of these, only the Labeled Release experiment obtained a clearly positive response. [...] These analyses support the interpretation that the Viking LR experiment did detect extant microbial life on Mars.
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    ...unless life arrived together with the nutrients...
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    Viking was one of the best sterilised sc we have ever launched! Just strange to read such an article published in an obscure Korean journal ...
Luís F. Simões

The Emerging Revolution in Game Theory - Technology Review - 2 views

  • The world of game theory is currently on fire. In May, Freeman Dyson at Princeton University and William Press at the University of Texas announced that they had discovered a previously unknown strategy for the game of prisoner's dilemma which guarantees one player a better outcome than the other. That's a monumental surprise. Theorists have studied Prisoner's Dilemma for decades, using it as a model for the emergence of co-operation in nature. This work has had a profound impact on disciplines such as economics, evolutionary biology and, of course, game theory itself. The new result will have impact in all these areas and more.
  • Ref: arxiv.org/abs/1208.2666: Winning isn't everything: Evolutionary stability of Zero Determinant strategies
Marcus Maertens

Mars Curiosity Descent - Ultra HD 30fps Smooth-Motion - YouTube - 3 views

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    Interpolation of the images of the curiosity landing. Very nice work!
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    this is fantastic!!!
Nicholas Lan

last days of the polymath - 9 views

multidisciplinarity fun science

started by Nicholas Lan on 17 Nov 09 no follow-up yet
Nina Nadine Ridder

Top 10 Surprising Results of Global Warming | LiveScience - 5 views

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    #4 is pretty interesting 
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    first time I hear about this!!! Is there any peer reviewed paper reference to this? should impact missions like GOCE!!
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    There are (even in Science): http://science-mag.aaas.org/cgi/reprint/314/5803/1253.pdf There is also a group at UCAR (lead by S. Solomon, one of the Gods in atmospheric research) who are analyzing this effect: http://www.ucar.edu/news/releases/2006/thermosphere.shtml
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    for the drag effect, this is well known in fluid mechanics, we use the Knudsen number, which explains this phenomenon ... for a perfect gaz though!
LeopoldS

IISC - International Institute of Space Commerce - 5 views

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    interesting collection / source of reports linked to space ...
pacome delva

Philosophers' Imprint - 5 views

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    An interesting (free) journal on philosophy, with even some article with mathematics and physics !
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    Reading the titles somehow reminds me of the most important webpage of the ACT: the Advanced Concepts Generator :-)
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    have you seen the 2 articles on canonical GR ...!
Francesco Biscani

The World's Most Unusual Outsourcing Destination - PCWorld Business Center - 5 views

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    As discussed during lunchtime...
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    "Development work that requires an Internet connection is transferred across the border to China." What are programmers doing 'while the code is compiling'? Play table tennis?
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    fantastic ... I particularly like: "Kim Jong Il, the de-facto leader of the country, declared people who couldn't use computers to be one of the three fools of the 21st century. (The others, he said, are smokers and those ignorant of music.)"
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