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Panel Picks 3 Finalists for ESAs Cosmic Vision M class Missions | SpaceNews.com - 3 views

spacenews.com/...ic-vision-mclass-missions.html MAD Class_M Science Marco Polo
shared by Joris _ on 20 Jan 10 - Cached
pacome delva liked it
  • “superb from a science standpoint,” but beyond Europe’s current budget
  • There was some questioning of the cost estimate for Euclid, but at some point you have to decide: Either you don’t believe the estimates that [ESA science program managers] produced, or you assume their estimates are credible. Euclid was the one mission where costs were debated, but the consensus was to use the cost estimates presented to us.
  • pacome delva on 20 Jan 10
     
    finally cross-scale is not selected, it was the only cosmic vision mission with multi-satellites formation flying, since the concept for Xeus has changed. There is still Swarm but it's not really formation flying... So ESA is missing something here...
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Superconductors could simulate the brain - 2 views

physicsworld.com/...41916 superconductors brain
shared by pacome delva on 08 Mar 10 - Cached
  • who have shown how networks of artificial neurons containing two Josephson junctions would outpace more traditional computer-simulated brains by many orders of magnitude. Studying such junction-based systems could improve our understanding of long-term learning and memory along with factors that may contribute to disorders like epilepsy.
  • The existing design does not permit learning since the weighting of connections between synapses cannot be changed over time, but Segall believes that if this feature can be added then their neurons might allow a lifetime's worth of learning to be simulated in five or ten minutes. This, he adds, should help us to understand how learning changes with age and might give us clues as to how long-term disorders like Parkinson's disease develops.
  • Christos Ampatzis on 09 Mar 10
     
    What I don't get is how the measure the extent of matching: how "close", or realistic is the modelisation they achieve with different methods? And moreover, if weights cannot adapt and there are no direct connections between neurons and layers of neurons, isnt that a very arbitrary matching?
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Researcher Creates 'Facebook for Scientists' - 1 views

www.nytimes.com/...book-for-scientists-22081.html inf Web 2.0 ariadnet science
shared by Ma Ru on 19 Mar 10 - Cached
  • Ma Ru on 19 Mar 10
  • ...4 more comments...
  • LeopoldS on 20 Mar 10
     
    and we are of course there since some time :-) and even have our own group in there ... think that Tobias has first discovered it our group is: https://www.researchgate.net/group/ESA_Advanced_Concepts_Team/ everybody welcome to join ... though Ariadnet is better
  • Ma Ru on 23 Mar 10
     
    So if I'm already on Ariadnet, there's no need for me to join this researchgate thingy? Pheew..
  • Luzi Bergamin on 23 Mar 10
     
    Very active group, it has exactly one member (Leo) and exactly zero (ZERO,0!!) posts since June 13, 2008!!! Well, sounds like a very typical ACT action in order to increase the key performance indicators :D.
  • Ma Ru on 23 Mar 10
     
    Oh come on Luzi, don't be over-pessimistic! It's just because all activity takes place on Ariadnet ;-)
  • nikolas smyrlakis on 24 Mar 10
     
    tsk tsk typical ex-ACT criticism.. Maybe for me too from next week;P
  • Luzi Bergamin on 24 Mar 10
     
    WRONG! You ignore the fact that I complained already while I was yet in the ACT!! Seriously: I clicked around in "ResearchGate" a little bit, couldn't find too many interesting things. Many scientists from India, Iran etc. desperately looking for contacts, retired engineers/scientists from industry that now remember that they were once at university and also quite a number of semi-crackpots. My honest conclusion: not a must. Btw: wish you a nice post-ACT depression! Keep a stiff upper lip, esp. in case you go back to Greece...
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Grappling With Space Debris - 1 views

www.spacedaily.com/...ing_With_Space_Debris_999.html space debris security
shared by Juxi Leitner on 23 Mar 10 - Cached
  • Fortunately, as we speak, the very best space engineers are tackling the problem of how to tackle space debris and get it out of the way.
  • Juxi Leitner on 23 Mar 10
     
    another of those articles...
  • nikolas smyrlakis on 24 Mar 10
     
    i guess when it says about the very best engineers tackling the problem as we speak, it refers to our brainstorms. How did they find out?
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Toward Liquid-Cooled Computers - 0 views

news.sciencemag.org/...d-liquid-cooled-computers.html computer liquid-cooling
shared by pacome delva on 30 Mar 10 - Cached
  • pacome delva on 30 Mar 10
     
    only for the nerds who took the test and answered that they built their computer themselves...
  • ...1 more comment...
  • Nicholas Lan on 30 Mar 10
     
    i should point out i only got 79 on the nerd test but... http://www.youtube.com/watch?v=dUEpFef6caQ
  • pacome delva on 30 Mar 10
     
    i was about to say these guys are 300% nerds but i just saw they use windows...! fake nerds :) Anyway 5.15Ghz's not bad
  • Nicholas Lan on 30 Mar 10
     
    oddly most overclocking products and software seem to be aimed at windows as far as i can tell. I'd guess because people usually only bother to do it for gaming?
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04.02.2010 - Researchers enable a robot to fold towels - 3 views

www.berkeley.edu/...02_robot%20.shtml AI technology
shared by andreiaries on 06 Apr 10 - Cached
  • andreiaries on 06 Apr 10
     
    Amazing what robots learn to do these days :). Any background music ideas for the video?
  • Ma Ru on 06 Apr 10
     
    Nice try, but humans are still better in it... on so many levels: http://www.youtube.com/watch?v=qzFwn064cFE
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New Material: Network of 'Streets' for Light - 1 views

focus.aps.org/st14 phy metamaterials waveguides
shared by pacome delva on 19 Apr 10 - Cached
  • In recent years, researchers have created early versions of "invisibility cloaks" and advanced optical fibers by manipulating light using structures composed of tiny, repeating units. In the 9 April Physical Review Letters, a team proposes a different way to make an artificial optical material--from a network of light-guiding filaments. If such structures are practical, they could open new ways to control light in technologies ranging from high-speed telecommunication to high-resolution imaging.
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Hawking: Aliens are out there, likely to be Bad News * The Register - 3 views

www.theregister.co.uk/...hawking_aliens_warning aliens
shared by Joris _ on 26 Apr 10 - Cached
  • Luzi Bergamin on 26 Apr 10
     
    I think it's time to quote "Calvin & Hobbes" (yes, I'm still the guy who knows a C&H for any situation in life) "Sometimes I think the surest sign that intelligent life exists elsewhere in the universe is that none of it has tried to contact us." One should sue this idiot for racism against extraterrestrials!!
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Mapping Turbulence in the Solar Wind - 0 views

focus.aps.org/st16 phy astrophysics solar_wind formation_flying turbulence
shared by pacome delva on 03 May 10 - Cached
  • a team reports studying the turbulent flow of solar wind particles by monitoring the accompanying waves of magnetic field. The team used a cluster of satellites to measure the field in unprecedented spatial detail. They found that the waves aren't equally strong in all directions but are larger in certain preferred directions, as theorists had predicted. The observation will help astrophysicists better understand the consequences of the solar wind, including its effect on the transmission of cosmic rays, particles that arrive at Earth from elsewhere in our galaxy.
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Networked Networks Are Prone to Epic Failure | Wired Science | Wired.com - 1 views

www.wired.com/...networked-networks tech networks failure
shared by Juxi Leitner on 27 Apr 10 - Cached
  • The interconnections fueled a cascading effect, with the failures coursing back and forth. A damaged node in the first network would pull down nodes in the second, which crashed nodes in the first, which brought down more in the second, and so on. And when they looked at data from a 2003 Italian power blackout, in which the electrical grid was linked to the computer network that controlled it, the patterns matched their models’ math.
  • Juxi Leitner on 27 Apr 10
     
    that would be an interesting "Systems of Systems" study for once ...
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Draper MIT Students Test Lunar Hopper with Eyes on Prize | SpaceNews.com - 0 views

www.spacenews.com/...tudents-test-lunar-hopper.html tech exploration hopping
shared by Juxi Leitner on 02 May 10 - Cached
  • The testing of the second-generation lunar hopper is being carried out under the supervision of engineers from the nearby Draper Laboratory with an eye toward competing for the Google Lunar X Prize in 2012.
  • Although planetary rovers are not new, the hopper concept could add a new dimension to robotic planetary exploration, one that Tuohy said could inspire a new generation of engineers, technologists and scientists.
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DARPA Looking for Partner On Wireless Spacecraft Demo | SpaceNews.com - 1 views

spacenews.com/...-wireless-spacecraft-demo.html fractionated spacecraft tech
shared by Juxi Leitner on 12 May 10 - Cached
  • DARPA will entertain proposals from all qualified sources, be they government, commercial, national or international, the posting said. Responses to the request for information are due May 17.
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The Semicolon Wars » American Scientist - 2 views

www.americanscientist.org/...issue.aspx inf
shared by Francesco Biscani on 07 Jan 11 - No Cached
  • Francesco Biscani on 07 Jan 11
     
    Pretty interesting piece on computer languages.
  • Luís F. Simões on 07 Jan 11
     
    Yes, very good, but I don't get what all the fuss is about... everyone knows Python is the ultimate programming language! :) Follow up reading: If programming languages were religions... (quite accurate actually) Great quote from the article you linked to: In 1975 Edsger W. Dijkstra, a major figure in the structured-programming movement, wrote a memo titled "How Do We Tell Truths that Might Hurt?" The "truths" were mostly Dijkstra's opinions of programming languages; how he told them was very bluntly. Fortran is "an infantile disorder," PL/I "a fatal disease," APL "a mistake, carried through to perfection." Students exposed to COBOL "are mentally mutilated beyond hope of regeneration," he said. "The use of COBOL cripples the mind; its teaching should, therefore, be regarded as a criminal offense."
  • Francesco Biscani on 07 Jan 11
     
    Fool! You can pry my templates from my cold dead hands!
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Scientists arguing about climate change - very funny - 2 views

www.youtube.com/watch
shared by duncan barker on 06 Jan 11 - No Cached
  • duncan barker on 06 Jan 11
     
    They are arguing about whether its the Sun or CO2 levels which effect global temperatures. which do you believe?
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Global Warning - a project of the National Security Journalism Initiative - 0 views

global-warning.org/main Arctic Climate Change Global Warming and Security Environment Energy Youth Students Water Military
shared by Isabelle DB on 12 Jan 11 - No Cached
  • Isabelle DB on 12 Jan 11
     
    "WASHINGTON, D.C. - In a three-month investigation, a team of Northwestern University student reporters has found that the US nation's security establishment is not adequately prepared for many of the environmental changes that are coming faster than predicted and that threaten to reshape demands made on the military and intelligence community. This is despite the fact that the Defense Department has called climate change a potential "accelerant of instability." The Medill School of Journalism graduate student team began publication on January 10 of its findings on the national security implications of climate change with a series of print, video and interactive stories."
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Malagasy Spiders Spin the World's Toughest Biological Material - ScienceNOW - 0 views

news.sciencemag.org/...y-spiders-spin-the-worlds.html bio biomaterials spiders
shared by pacome delva on 04 Jan 11 - No Cached
  • Like an engineer accounting for a skyscraper swaying in the wind, Madagascar's Darwin's bark spider (Caerostris darwini) spins enormous, river-spanning webs that stretch and contract as the trees to which they're anchored bend this way and that. A new study finds that this spider's silk is the toughest biomaterial yet discovered.
  • The spiders' colossal orb webs can span up to 2.8 square meters and are anchored by threads as long as 25 meters.
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SPACE.com -- Venus Probe's Problems May Cause Japan to Scale Back - 0 views

www.space.com/...suki-japan-rethink-101217.html space MAD
shared by Joris _ on 20 Dec 10 - No Cached
  • We have to be more conservative to plan our next planetary mission, so it will never fail in any aspect."
  • the probe's initial failure will have a big impact on how JAXA plans future planetary missions
  • hew to more conservative ideas in the near future
  • Joris _ on 20 Dec 10
     
    what a shame! ambition and innovation have not been fairly rewarded ...
  • ...1 more comment...
  • Ma Ru on 20 Dec 10
     
    Did you try to run your algorithm on their problem as Dario suggested? I'm very curious!
  • Joris _ on 20 Dec 10
     
    I didn't have time yet. But formulating the failure with a MTBF or a FIT, you can easily imagine a more robust solution. Instead of one single burn, you would make several smaller burns - It will take more time and require more fuel though. Another "robust" approach is to consider weak stability boundary capture. Again it takes time, but chances of failure are lessen.
  • LeopoldS on 21 Dec 10
     
    would be a pity indeed!
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Kaggle: Crowdsourcing Data Modeling - 2 views

www.kaggle.com/aboutus crowdsourcing competition data mining statistics data database
shared by Luís F. Simões on 05 Jan 11 - No Cached
  • Kaggle is an innovative solution for statistical/analytics outsourcing. We are the leading platform for data modeling and prediction competitions. Companies, governments and researchers present datasets and problems - the world's best data scientists then compete to produce the best solutions. At the end of a competition, the competition host pays prize money in exchange for the intellectual property behind the winning model.
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Polynomial Time Code For 3-SAT Released, P==NP - Slashdot - 0 views

science.slashdot.org/...me-Code-For-3-SAT-Released-PNP INF computer science mathematics algorithm complexity P=NP?
shared by Luís F. Simões on 20 Jan 11 - No Cached
  • "Vladimir Romanov has released what he claims is a polynomial-time algorithm for solving 3-SAT. Because 3-SAT is NP-complete, this would imply that P==NP. While there's still good reason to be skeptical that this is, in fact, true, he's made source code available and appears decidedly more serious than most of the people attempting to prove that P==NP or P!=NP. Even though this is probably wrong, just based on the sheer number of prior failures, it seems more likely to lead to new discoveries than most. Note that there are already algorithms to solve 3-SAT, including one that runs in time (4/3)^n and succeeds with high probability. Incidentally, this wouldn't necessarily imply that encryption is worthless: it may still be too slow to be practical."
  • Luís F. Simões on 20 Jan 11
     
    here we go again...
  • Luís F. Simões on 28 Feb 11
     
    slashdot: "Russian computer scientist Vladimir Romanov has conceded that his previously published solution to the '3 SAT' problem of boolean algebra does not work."
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Macroscopic invisibility cloaking of visible light : Nature Communications : Nature Pub... - 3 views

www.nature.com/...ncomms1176.html invisibility PHY science
shared by LeopoldS on 02 Feb 11 - No Cached
  • LeopoldS on 02 Feb 11
     
    and all this without magic metamaterials ...
  • ...1 more comment...
  • Luzi Bergamin on 02 Feb 11
     
    Wellwellwell! I don't know how I have to complain, since I could not yet read the full article, but I'm sure I will :-).
  • Luzi Bergamin on 02 Feb 11
     
    It's funny to see how people get more and more humble in the desperate attempt to save their stupid ideas... At the beginning was the brave and bold aim to cloak something in free space (in a sphere or a cylinder). This requires inhomogeneous, anisotropic, magnetic materials; hopeless!! So one reduces to one polarization, now we have inhomogenous, anisotropic materials; still hopeless! At this point one downgraded the pretension: instead of cloaking in free space, we make a "carpet cloak" and hide an object behind an invisible dent in a mirror. But if that shall be continuous, we still need inhomogeneity and this is very hard. So now instead of a dent we take a cone and then it is claimed to work ... for ONE polarization. But of course the cloak can't work at all incident angles... irony of fate: everything is now made from birefringent media, the antithesis of what the metamaterials dogma was at the beginning!
  • jmlloren on 04 Feb 11
     
    Hi Luzi, can you please send me the paper. We are writing a project based on sulfates and carbonates, and all this BS sounds great for the introduction (The authors used Calcite as birefringent material)
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