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2More

Can a collapse of global civilization be avoided? - 4 views

rspb.royalsocietypublishing.org/...20122845.full science
shared by Marcus Maertens on 04 Feb 13 - No Cached
  • johannessimon81 on 04 Feb 13
     
    Scary. Maybe we should start to consider what to do after things go bad. Some kind of Asimov'ian Foundation?
  • Marcus Maertens on 04 Feb 13
     
    Sooner or later we'll have to infect other planets with our dumb selves - there is no way around that. Until then we have to delay the collapse by deploying local rules which emerge in a globally more responsible behavior of mankind.
6More

Have We Detected Megastructures Built By Aliens Around A Distant Star? | Popular Science - 7 views

www.popsci.com/structures-around-distant-star
shared by Dario Izzo on 15 Oct 15 - No Cached
  • Dario Izzo on 15 Oct 15
     
    Really? Is this what we were all waiting for?
  • ...3 more comments...
  • jcunha on 16 Oct 15
     
    Reminds me of this - the discovery of the LGM-1 (LGM= Little Green Men indeed): http://www.aps.org/publications/apsnews/200602/history.cfm It turned out to be the first discovery of a pulsar, re-compensated by a Nobel Prize in Physics
  • Paul N on 16 Oct 15
     
    next GTOC idea?
  • jcunha on 10 Dec 15
     
    Guys in SETI have come out with a precision setup to analyze if we have found the true Death Star: http://phys.org/news/2015-12-extraterrestrial-laser-pulses-kic-seti.html Conclusions are no laser light coming out from there..
  • Paul N on 11 Dec 15
     
    to be honest, while the alien megastructure is a cookie idea, I highly doubt that those aliens woke up one day and thought: "hm, let's send laser pulses at this particular random spot in space sometime in the next 6 days".
  • jcunha on 17 May 16
     
    http://phys.org/news/2016-05-natural-alien-mystery-star-behavior.html?utm_source=nwletter&utm_medium=email&utm_campaign=weekly-nwletter
3More

Bold title ..... - 3 views

www.extremetech.com/...ow-learn-from-pure-observation
shared by Dario Izzo on 02 Sep 16 - No Cached
  • johannessimon81 on 02 Sep 16
     
    I got a fever. And the only prescription is more cat faces! ...../\_/\ ...(=^_^) ..\\(___) The article sounds quite interesting, though. I think the idea of a "fake" agent that tries to trick the classifier while both co-evolve is nice as it allows the classifier to first cope with the lower order complexity of the problem. As the fake agent mimics the real agent better and better the classifier has time to add complexity to itself instead of trying to do it all at once. It would be interesting if this is later reflected in the neural nets structure, i.e. having core regions that deal with lower order approximation / classification and peripheral regions (added at a later stage) that deal with nuances as they become apparent. Also this approach will develop not just a classifier for agent behavior but at the same time a model of the same. The later may be useful in itself and might in same cases be the actual goal of the "researcher". I suspect, however, that the problem of producing / evolving the "fake agent" model might in most case be at least as hard as producing a working classifier...
  • johannessimon81 on 05 Sep 16
     
    This paper from 2014 seems discribe something pretty similar (except for not using physical robots, etc...): https://papers.nips.cc/paper/5423-generative-adversarial-nets.pdf
  • Paul N on 13 Sep 16
     
    Yes, this IS basically adversarial learning. Except the generator part instead of being a neural net is some kind of swarm parametrization. I just love how they rebranded it, though. :))
2More

The Cure For Fear | New Republic - 2 views

newrepublic.com/...cure-fear BIO
shared by jaihobah on 03 May 16 - No Cached
  • jaihobah on 03 May 16
     
    A long read but very interesting and well written.
  • jaihobah on 03 May 16
     
    PS: Does this quote from the article not sound a lot like Inception? 'In any given situation, the brain will retrieve old memories to inform an organism's behavior. If the memory is relevant to the situation, the organism can act on the information; if it is not relevant, then the organism can learn from the situation and create a new memory. With reconsolidation, researchers argued, there seemed to be a brief window in between the retrieval of an old memory and the creation of a new memory in which the old memory is vulnerable to manipulation.'
3More

New method uses heat flow to levitate variety of objects - 1 views

phys.org/...2-method-levitate-variety.html technology science PHY microgravity
shared by jcunha on 16 Feb 17 - No Cached
  • jcunha on 16 Feb 17
     
    Normally we associate levitation of objects to superconducting materials. Here a new technique is shown where levitation of a whole new range of materials is shown. "The large temperature gradient leads to a force that balances gravity and results in stable levitation," said Fung, the study's lead author. "We managed to quantify the thermophoretic force and found reasonable agreement with what is predicted by theory. This will allow us to explore the possibilities of levitating different types of objects." Paper at http://aip.scitation.org/doi/10.1063/1.4974489 New microgravity experiments possibility?
  • LeopoldS on 01 Mar 17
     
    not really I fear .... "Typical sizes of the trapped particles are between 10 μm and 1 mm at a pressure between 1 and 10 Torr. The trapping stability is provided radially by the increasing temperature field and vertically by the transition from the free molecule to hydrodynamic behavior of thermophoresis as the particles ascend."
  • jcunha on 06 Mar 17
     
    Might still be OK micro to mm sized experiments. The technique seems to be reliable and cheap enough to compete with other types of microgravity approaches - more research needed to define boundaries of course.
3More

Uncoiling the cucumber's enigma - 1 views

www.eurekalert.org/...hu-utc083012.php
shared by pandomilla on 31 Aug 12 - No Cached
  • pandomilla on 31 Aug 12
     
    Captivated by a strange coiling behavior in the grasping tendrils of the cucumber plant, researchers at Harvard University have characterized a new type of spring that is soft when pulled gently and stiff when pulled strongly. Instead of unwinding to a flat ribbon under stress, as an untwisted coil normally would, the cucumber's tendrils actually coil further.
  • pandomilla on 31 Aug 12
     
    ...interesting discovery that can add something to my ongoing Ariadna...
  • pandomilla on 31 Aug 12
     
    And here you have the paper published today on Science http://www.sciencemag.org/content/337/6098/1087.full
1More

Adventures In Behavioral Neurology-or-what Neurology Can Tell Us About Human Nature | C... - 0 views

edge.org/...dventures_behavioral_neurology Brain
shared by LeopoldS on 21 Feb 12 - No Cached
  • LeopoldS on 21 Feb 12
     
    Nice story about the brain
1More

Flying robot quadrotors have better rhythm than you - 2 views

www.guardian.co.uk/...ing-robot-quadrotors-ted-video
shared by Luke O'Connor on 02 Mar 12 - No Cached
  • Luke O'Connor on 02 Mar 12
     
    Robotics scientists at TED unleash co-ordinated drones that mimic bird behavior to play the James Bond theme song At TED2012, the University of Pennsylvania's deputy dean for education Vijay Kuma showed off his latest accomplishment in robotics: a co-ordinated rendition of the James Bond theme song.
1More

Robot termites able to build various structures - 0 views

www.sciencemag.org/...754 BIO AI technology science
shared by Guido de Croon on 21 Feb 14 - No Cached
  • Guido de Croon on 21 Feb 14
     
    Nice application of swarm robotics for building various structures. See the video at: http://www.youtube.com/watch?v=LFwk303p0zY Their compilation process of a desired structure into local behavior rules seems of most interest.
1More

Walking droplets (video) - 2 views

phys.org/...ilot-wave-dynamics-action.html science
shared by Thijs Versloot on 02 Oct 13 - No Cached
  • johannessimon81 on 02 Oct 13
     
    Wow, the two droplets that orbit each other are really cool - as is the explanation!
1More

Evolutionary strategy: song birds search food in morning, go eat it in afternoon - 0 views

www.bbc.co.uk/24458583 BIO
shared by johannessimon81 on 11 Oct 13 - No Cached
  • johannessimon81 on 11 Oct 13
     
    Song birds don't eat in the morning because the added weight makes them slow and easy prey for other birds. They look for good food places during the early day and come back to eat as late as possible. Correlation of this behavior with the number of predators has been found as well...
6More

Does your iPhone have free will? #arXiv - 3 views

medium.com/...1e223b77e60 technology behavior
shared by Thijs Versloot on 22 Oct 13 - No Cached
  • Thijs Versloot on 22 Oct 13
     
    If you've ever found your iPhone taking control of your life, there may be a good reason. It may think it has free will. That may not be quite as far-fetched as it sounds. Today, one leading scientist outlines a 'Turing Test' for free will and says that while simple devices such as thermostats cannot pass, more complex ones like iPhones might.
  • ...3 more comments...
  • Luzi Bergamin on 22 Oct 13
     
    An interesting paper about how you should *NOT* think about free will...
  • johannessimon81 on 23 Oct 13
     
    I must say that the fact that the outcome of a thought process is not evident to myself in advance sounds like a more plausible explanation than 'free will' being the product of quantum mechanics. The later would not only produce unpredictable decisions but probably also irrational ones...
  • Paul N on 24 Oct 13
     
    Even if it were the product of quantum mechanics, it's still the result of external interference and not the result of 'free' will. It doesn't matter if the external input is deterministic or random, it's still external and it's not "YOU" that decided stuff.
  • Luzi Bergamin on 24 Oct 13
     
    I don't know the inventor of that nonsense that the free will should be the result of QM. It's about the only point I agree with the author of the paper: QM is not necessary and doesn't help. What I meant: all these thought experiments done by typical ultra-naive realists (or ultra-naive physicalists, if you prefer) that cultivate the university departments of physics, computer science etc. are put the cart before the horse. First one has to clarify the role of physical theories and its concepts (e.g. causality) and then one can start to ask how "free will" could perhaps be seen in these theories. More than 200 years ago there existed a famous philosopher named Kant who had some interesting thoughts about this. But authors like Lloyd behave as if he never existed, in fact is view of the world is even pre-Platonic!
  • LeopoldS on 27 Oct 13
     
    Henry Kissinger How I'm missing yer And wishing you were here
2More

The Consequences of a Boozy Youth -- Miller 2009 (921): 1 -- ScienceNOW - 0 views

sciencenow.sciencemag.org/...1 bio rats alcohol
shared by pacome delva on 28 Sep 09 - Cached
  • early alcohol use can cause lasting changes in behavior.
  • 3 months after their last drink, they always preferred the risky lever, even when they payoff was poor
3More

The free-energy principle: A unified brain theory - 3 views

m8ta.com/817_1.pdf
shared by Eduardo Martin Moraud on 19 Aug 10 - No Cached
  • Eduardo Martin Moraud on 19 Aug 10
     
    ... a theory of everytg. Dario, enjoy! :)
  • Dario Izzo on 19 Aug 10
     
    the guy is also a guru of brain imaging....... " and is currently the fourth most cited scientist in neuroscience and behavior in the world " - WoW
  • duncan barker on 19 Aug 10
     
    i think the guy was smoking something whilst writing this!!
11More

The End Of Gravity As a Fundamental Force - 6 views

science.slashdot.org/...Gravity-As-a-Fundamental-Force phy
shared by Francesco Biscani on 11 Jan 10 - Cached
LeopoldS liked it
  • Francesco Biscani on 11 Jan 10
     
    "At a symposium at the Dutch Spinoza-instituut on 8 December, 2009, string theorist Erik Verlinde introduced a theory that derives Newton's classical mechanics. In his theory, gravity exists because of a difference in concentration of information in the empty space between two masses and its surroundings. He does not consider gravity as fundamental, but as an emergent phenomenon that arises from a deeper microscropic reality. A relativistic extension of his argument leads directly to Einstein's equations."
  • ...8 more comments...
  • Dario Izzo on 12 Jan 10
     
    Diffcult for me to fully understand / believe in the holographic principle at macroscopical scales ... potentially it looks though as a revolutionary idea.....
  • pacome delva on 13 Jan 10
     
    never heard about it... seems interesting. At first sight it seems that it is based on fundamental principle that could lead to a new phenomenology, so that could be tested. Perhaps Luzi knows more about this ? Did we ever work on this concept ?
  • Luzi Bergamin on 13 Jan 10
     
    The paper is quite long and I don't have the time right now to read it in detail. Just a few comments: * We (ACT) definitely never did anything in this direction? But: is there a new phenomenology? I'm not sure, if the aim is just to get Einstein's theory as emergent theory, then GR should not change (or only change in extreme conditions.) * Emergent gravity is not new, also Erik admits that. The claim to have found a solution appears quite frequently, but most proposals actually are not emergent at all. At least, I have the impression that Erik is aware of the relevant steps to be performed. * It's very difficult to judge from a short glance at the paper, up to which point the claims are serious and where it just starts to be advertisments. Section 6 is pretty much a collection of self-praise. * Most importantly: I don't understand how exactly space and time should be emergent. I think it's not new to observe that space is related to special canonical variables in thermodynamics. If anybody can see anything "emergent" in the first paragraphs of section 3, then please explain me. For me, this is not emergent space, but space introduced with a "sledge hammer." Time anyway seems to be a precondition, else there is nothing like energy and nothing like dynamics. * Finally, holography appears to be a precondition, to my knowledge no proof exists that normal (non-supersymmetric, non-stringy, non-whatever) GR has a holographic dual.
  • Luzi Bergamin on 13 Jan 10
     
    Update: meanwhile I understood roughly what this should be about. It's well known that BH physics follow the laws of theormodynamics, suggesting the existence of underlying microstates. But if this is true, shouldn't the gravitational force then be emergent from these microstates in the same way as any theromdynamical effect is emergent from the behavior of its constituents (e.g. a gas)? If this can be prooven, then indeed gravity is emergent. Problem: one has to proof that *any* configuration in GR may be interpreted as thermodynamical, not just BHs. That's probably where holography comes into the play. To me this smells pretty much like N=4 SYM vs. QCD. The former is not QCD, but can be solved, so all stringy people study just that one and claim to learn something about QCD. Here, we look at holographic models, GR is not holographic, but who cares... Engineering problems...
  • LeopoldS on 13 Jan 10
     
    is there any experimental or observational evidence that points to this "solution"?
  • Luzi Bergamin on 13 Jan 10
     
    Are you joking??? :D
  • pacome delva on 14 Jan 10
     
    I was a bit fast to say it could be tested... apparently we don't even know a theory that is holographic, perhaps a string theory (see http://arxiv.org/abs/hep-th/9409089v2). So very far from any test...
  • LeopoldS on 14 Jan 10
     
    Luzi, I miss you!!!
  • Luzi Bergamin on 14 Jan 10
     
    Leo, do you mean you liked my comment on your question more than Pacome's? Well, the ACT has to evolve and fledge, so no bullshitting anymore, but serious and calculating answers... :-) Sorry Pacome, nothing against you!! I just LOVE this Diigo because it gives me the opportunity for a happy revival of my ACT mood.
  • pacome delva on 14 Jan 10
     
    haha, today would have been great to show your mood... we had a talk on the connection between mind and matter !!
1More

Laser light and the nematode C. elegans - 2 views

colbert.physics.harvard.edu/videos.php bio phy
shared by Isabelle DB on 10 Mar 11 - No Cached
  • Isabelle DB on 10 Mar 11
     
    Controlling Locomotion and Behavior in Real-Time
1More

Physics - Neighborly networks - 0 views

physics.aps.org/...PhysRevLett.103.058701 networks
shared by pacome delva on 05 Aug 09 - Cached
  • Many networks, from the Internet to Facebook, are transitive: neighbors of the same node are probably neighbors of each other, or in social terms, your friends are likely to be friends with each other too. Apart from a few special cases, mathematically modeling such clustered networks is difficult and calculating their properties almost always requires numerical rather than analytical solutions. But as Mark Newman of the University of Michigan, US, reports in Physical Review Letters, it is in fact possible to generalize random graph models to include clustering in a way that allows exact derivations of network behavior.
1More

Digital holographic microscopy reveals prey-induced changes in swimming behavior of pre... - 0 views

www.pnas.org/...17512 BIO methods paper fun
shared by ESA ACT on 24 Apr 09 - Cached
  • ESA ACT on 24 Apr 09
     
    The study doesn't seem relevant to us - but the name of the method is just marvellous!
1More

PLoS ONE: Order in Spontaneous Behavior - 0 views

www.plosone.org/...fetchArticle.action BIO swarm
shared by ESA ACT on 24 Apr 09 - Cached
  • ESA ACT on 24 Apr 09
     
    Free will in (stupid) fruit flies - that will make swarm behaviour even more difficult...
1More

Interaction ruling animal collective behavior depends on topological rather than metric... - 0 views

www.pnas.org/...1232 paper swarm
shared by ESA ACT on 24 Apr 09 - Cached
  • ESA ACT on 24 Apr 09
     
    Some rules of swarming.
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