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santecarloni

Vision of beauty - physicsworld.com - 6 views

physicsworld.com/...45840

vision bio technology

shared by santecarloni on 06 May 11 - No Cached
LeopoldS liked it
  • santecarloni on 06 May 11
     
    "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".
  • LeopoldS on 07 May 11
     
    Wow
Juxi Leitner

ESA Servers Hacked - 11 views

tinkode27.baywords.com/esa-int-hacked-full-disclosure

technology internet

shared by Juxi Leitner on 09 May 11 - No Cached
  • Juxi Leitner on 09 May 11
     
    uups :)
  • ...4 more comments...
  • Francesco Biscani on 09 May 11
     
    whoops indeed
  • LeopoldS on 10 May 11
     
    sounds really bad ... how bad is it???
  • Ma Ru on 10 May 11
     
    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."
  • LeopoldS on 11 May 11
     
    got the reply from IT security today: they had dealt with apparently the very same day and all under control :-)
  • Ma Ru on 12 May 11
     
    Well, I wouldn't expect a reply: "all our past emails have been downloaded and sold to NASA" even if that was the case.
  • Francesco Biscani on 12 May 11
     
    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

physicsworld.com/...46388

rain PHY science

shared by santecarloni on 01 Jul 11 - No Cached
  • santecarloni on 01 Jul 11
     
    Altering local weather?
Francesco Biscani

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

www.itworld.com/...siness-misses-key-people-marks

fun

shared by Francesco Biscani on 26 Jul 11 - No Cached
LeopoldS and Joris _ liked it
  • 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.
  • ...1 more annotation...
  • Just because you can do something with technology that doesn't mean you should do something with technology,
  • Francesco Biscani on 26 Jul 11
     
    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

www.newscientist.com/...osoft-releases-toolkit-to.html

technology DIY electronics gadgets

shared by Ma Ru on 04 Aug 11 - No Cached
LeopoldS liked it
  • Ma Ru on 04 Aug 11
     
    Surprisingly cool initiative from Microsoft...
  • Joris _ on 05 Aug 11
     
    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!)
  • LeopoldS on 14 Aug 11
     
    very nice indeed!
jmlloren

The British Wildlife Photography Awards 2011 - Telegraph - 2 views

www.telegraph.co.uk/...e-Photography-Awards-2011.html

FUN

shared by jmlloren on 27 Sep 11 - No Cached
LeopoldS and Ma Ru liked it
  • jmlloren on 27 Sep 11
     
    Excellent photo gallery.
  • Ma Ru on 07 Oct 11
     
    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
  • Ma Ru on 20 Oct 11
LeopoldS

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

www.monash.edu.au/...r-the-future-of-energy-storage

energy NRG storage graphene

shared by LeopoldS on 07 Nov 11 - No Cached
LeopoldS liked it
  • LeopoldS on 07 Nov 11
     
    any idea how this works - who wants to have a closer look at it?
  • ...3 more comments...
  • dejanpetkow on 08 Nov 11
     
    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.
  • LeopoldS on 09 Nov 11
     
    and the different graphene layers act as anodes and cathodes??
  • dejanpetkow on 09 Nov 11
     
    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.
  • LeopoldS on 10 Nov 11
     
    Wouldn't it be worth having a closer look?
  • LeopoldS on 12 Nov 11
     
    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

physicsworld.com/...48637

bio phy

shared by pacome delva on 20 Feb 12 - No Cached
LeopoldS liked it
  • Isabelle DB on 23 Feb 12
     
    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

ijass.org/...year_abstract.asp

Bio Space

shared by Marion Nachon on 19 Apr 12 - No Cached
LeopoldS liked it
  • Marion Nachon on 19 Apr 12
     
    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.
  • Ma Ru on 19 Apr 12
     
    ...unless life arrived together with the nutrients...
  • LeopoldS on 21 Apr 12
     
    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

www.technologyreview.com/...ging-revolution-in-game-theory

game theory evolution cooperation

shared by Luís F. Simões on 21 Aug 12 - No Cached
  • 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

www.youtube.com/watch

technology space FUN

shared by Marcus Maertens on 14 Sep 12 - No Cached
  • Marcus Maertens on 14 Sep 12
     
    Interpolation of the images of the curiosity landing. Very nice work!
  • LeopoldS on 25 Sep 12
     
    this is fantastic!!!
Nina Nadine Ridder

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

www.livescience.com/..._global_warming_results-1.html

climate_change satellite_orbit drag atmosphere

shared by Nina Nadine Ridder on 07 Dec 09 - Cached
LeopoldS liked it
  • Nina Nadine Ridder on 07 Dec 09
     
    #4 is pretty interesting 
  • ...1 more comment...
  • LeopoldS on 08 Dec 09
     
    first time I hear about this!!! Is there any peer reviewed paper reference to this? should impact missions like GOCE!!
  • Nina Nadine Ridder on 08 Dec 09
     
    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
  • Joris _ on 08 Dec 09
     
    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

www.iisc.im/publications.asp

reports science engineering space

shared by LeopoldS on 07 Jan 10 - Cached
Nicholas Lan liked it
  • LeopoldS on 07 Jan 10
     
    interesting collection / source of reports linked to space ...
pacome delva

Philosophers' Imprint - 5 views

quod.lib.umich.edu/...text-idx

philosophy phy math

shared by pacome delva on 18 Jan 10 - Cached
Nicholas Lan liked it
  • pacome delva on 18 Jan 10
     
    An interesting (free) journal on philosophy, with even some article with mathematics and physics !
  • Luzi Bergamin on 18 Jan 10
     
    Reading the titles somehow reminds me of the most important webpage of the ACT: the Advanced Concepts Generator :-)
  • pacome delva on 18 Jan 10
     
    have you seen the 2 articles on canonical GR ...!
Francesco Biscani

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

www.pcworld.com/...l_outsourcing_destination.html

shared by Francesco Biscani on 15 Jun 10 - Cached
LeopoldS liked it
  • Francesco Biscani on 15 Jun 10
     
    As discussed during lunchtime...
  • andreiaries on 15 Jun 10
     
    "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?
  • LeopoldS on 15 Jun 10
     
    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.)"
Francesco Biscani

Apple's Mistake - 5 views

www.paulgraham.com/apple.html

shared by Francesco Biscani on 16 Jun 10 - Cached
LeopoldS liked it
  • Francesco Biscani on 16 Jun 10
     
    Nice opinion piece.
  • LeopoldS on 16 Jun 10
     
    nice indeed .... especially like: "They make such great stuff, but they're such assholes. Do I really want to support this company? Should Apple care what people like me think? What difference does it make if they alienate a small minority of their users? There are a couple reasons they should care. One is that these users are the people they want as employees. If your company seems evil, the best programmers won't work for you. That hurt Microsoft a lot starting in the 90s. Programmers started to feel sheepish about working there. It seemed like selling out. When people from Microsoft were talking to other programmers and they mentioned where they worked, there were a lot of self-deprecating jokes about having gone over to the dark side. But the real problem for Microsoft wasn't the embarrassment of the people they hired. It was the people they never got. And you know who got them? Google and Apple. If Microsoft was the Empire, they were the Rebel Alliance. And it's largely because they got more of the best people that Google and Apple are doing so much better than Microsoft today. Why are programmers so fussy about their employers' morals? Partly because they can afford to be. The best programmers can work wherever they want. They don't have to work for a company they have qualms about. But the other reason programmers are fussy, I think, is that evil begets stupidity. An organization that wins by exercising power starts to lose the ability to win by doing better work. And it's not fun for a smart person to work in a place where the best ideas aren't the ones that win."
  • Ma Ru on 16 Jun 10
     
    Poor programmers can complain, but they will keep developing applications for iPhone as long as their bosses will tell them to do so... From my experience in mobile software development I assure you it's not the pain of the programmer that dictates what is done, but the customer's demand. Even though like this the quality of applications is somewhat worse than it could be, clients won't complain as they have no reference point. And things will stay as they are: apple censoring the applications, clients paying for stuff that "sometimes just does not work" (it's normal, isn't it??), and programmers complaining, but obediently making iPhone apps...
jmlloren

Exotic matter : Insight : Nature - 5 views

www.nature.com/...index.html

nan phy

shared by jmlloren on 03 Aug 10 - Cached
LeopoldS liked it
  • jmlloren on 03 Aug 10
     
    Trends in materials and condensed matter. Check out the topological insulators. amazing field.
  • ...12 more comments...
  • Luzi Bergamin on 03 Aug 10
     
    Aparently very interesting, will it survive the short hype? Relevant work describing mirror charges of topological insulators and the classical boundary conditions were done by Ismo and Ari. But the two communities don't know each other and so they are never cited. Also a way to produce new things...
  • jmlloren on 04 Aug 10
     
    Thanks for noticing! Indeed, I had no idea that Ari (don't know Ismo) was involved in the field. Was it before Kane's proposal or more recently? What I mostly like is that semiconductors are good candidates for 3D TI, however I got lost in the quantum field jargon. Yesterday, I got a headache trying to follow the Majorana fermions, the merons, skyrnions, axions, and so on. Luzi, are all these things familiar to you?
  • Luzi Bergamin on 04 Aug 10
     
    Ismo Lindell described in the early 90's the mirror charge of what is now called topological insulator. He says that similar results were obtained already at the beginning of the 20th century... Ismo Lindell and Ari Sihvola in the recent years discussed engineering aspects of PEMCs (perfect electro-megnetic conductors,) which are more or less classical analogues of topological insulators. Fundamental aspects of PEMCs are well knwon in high-energy physics for a long time, recent works are mainly due to Friedrich Hehl and Yuri Obukhov. All these works are purely classical, so there is no charge quantisation, no considerations of electron spin etc. About Majorana fermions: yes, I spent several years of research on that topic. Axions: a topological state, of course, trivial :-) Also merons and skyrnions are topological states, but I'm less familiar with them.
  • LeopoldS on 04 Aug 10
     
    "Non-Abelian systems1, 2 contain composite particles that are neither fermions nor bosons and have a quantum statistics that is far richer than that offered by the fermion-boson dichotomy. The presence of such quasiparticles manifests itself in two remarkable ways. First, it leads to a degeneracy of the ground state that is not based on simple symmetry considerations and is robust against perturbations and interactions with the environment. Second, an interchange of two quasiparticles does not merely multiply the wavefunction by a sign, as is the case for fermions and bosons. Rather, it takes the system from one ground state to another. If a series of interchanges is made, the final state of the system will depend on the order in which these interchanges are being carried out, in sharp contrast to what happens when similar operations are performed on identical fermions or bosons." wow, this paper by Stern reads really weired ... any of you ever looked into this?
  • jmlloren on 04 Aug 10
     
    C'mon Leopold, it's as trivial as the topological states, AKA axions! Regarding the question, not me!
  • LeopoldS on 04 Aug 10
     
    just looked up the wikipedia entry on axions .... at least they have some creativity in names giving: "In supersymmetric theories the axion has both a scalar and a fermionic superpartner. The fermionic superpartner of the axion is called the axino, the scalar superpartner is called the saxion. In some models, the saxion is the dilaton. They are all bundled up in a chiral superfield. The axino has been predicted to be the lightest supersymmetric particle in such a model.[24] In part due to this property, it is considered a candidate for the composition of dark matter.[25]"
  • jmlloren on 04 Aug 10
     
    Thank's Leopold. Sorry Luzi for being ironic concerning the triviality of the axions. Now, Leo confirmed me that indeed is a trivial matter. I have problems with models where EVERYTHING is involved.
  • Luzi Bergamin on 04 Aug 10
     
    Well, that's the theory of everything, isn't it?? Seriously: I don't think that theoretically there is a lot of new stuff here. Topological aspects of (non-Abelian) theories became extremely popular in the context of string theory. The reason is very simple: topological theories are much simpler than "normal" and since string theory anyway is far too complicated to be solved, people just consider purely topological theories, then claiming that this has something to do with the real world, which of course is plainly wrong. So what I think is new about these topological insulators are the claims that one can actually fabricate a material which more or less accurately mimics a topological theory and that these materials are of practical use. Still, they are a little bit the poor man's version of the topological theories fundamental physicists like to look at since electrdynamics is an Abelian theory.
  • jmlloren on 04 Aug 10
     
    I have the feeling, not the knowledge, that you are right. However, I think that the implications of this light quantum field effects are great. The fact of being able to sustain two currents polarized in spin is a technological breakthrough.
  • LeopoldS on 04 Aug 10
     
    not sure how much I can contribute to your apparently educated debate here but if I remember well from my work for the master, these non-Abelian theories were all but "simple" as Luzi puts it ... and from a different perspective: to me the whole thing of being able to describe such non-Abelian systems nicely indicates that they should in one way or another also have some appearance in Nature (would be very surprised if not) - though this is of course no argument that makes string theory any better or closer to what Luzi called reality ....
  • Luzi Bergamin on 04 Aug 10
     
    Well, electrodynamics remains an Abelian theory. From the theoretical point of view this is less interesting than non-Abelian ones, since in 4D the fibre bundle of a U(1) theory is trivial (great buzz words, eh!) But in topological insulators the point of view is slightly different since one always has the insulator (topological theory), its surrounding (propagating theory) and most importantly the interface between the two. This is a new situation that people from field and string theory were not really interested in.
  • Dario Izzo on 04 Aug 10
     
    guys... how would you explain this to your gran mothers?
  • jmlloren on 05 Aug 10
  • LeopoldS on 07 Aug 10
     
    *you* tried *your* best .... ??
Luís F. Simões

Image evolution - 5 views

alteredqualia.com/...evolve

image evolution AI fun

shared by Luís F. Simões on 09 Sep 10 - Cached
LeopoldS liked it
  • Luís F. Simões on 09 Sep 10
     
    A very simple, but very creative application of evolution! Try it with your images. You can read about the first implementation of this kind here: http://developers.slashdot.org/developers/08/12/09/0238252.shtml
Luís F. Simões

Timelapse video of asteroid discoveries in our solar system from 1980-2010 (watch in 10... - 5 views

www.youtube.com/watch

asteroid detection solar system WISE

shared by Luís F. Simões on 13 Sep 10 - No Cached
Joris _ liked it
  • Ma Ru on 14 Sep 10
     
    Nice... Now I have a lame question: after you have discovered ~500k asteroids, all moving (I assume more or less) chaotically in that asteroid belt, how do you tell one from another?
  • ...1 more comment...
  • Joris _ on 14 Sep 10
     
    hmm, not very chaotic indeed - laws of Kepler plus some perturbations.
  • Ma Ru on 15 Sep 10
     
    That's what I thought but when presented as a green "goo" in the video, it appears rather unordered... so I guess this is just an impression evoked by a not-to-scale presentation?
  • Francesco Biscani on 19 Sep 10
     
    It depends... orbits can be chaotic if the orbital period is in a resonance with Jupiter, although such orbits are not stable. Such configurations tend to get disrupted pretty quickly (in cosmic terms :P) http://en.wikipedia.org/wiki/Kirkwood_gap
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