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pacome delva

Galaxy study backs general relativity - 1 views

physicsworld.com/...41948

galaxy general_relativity gravitational_lensing survey

shared by pacome delva on 16 Mar 10 - Cached
  • The observed ratio, dubbed EG, has a value of 0.39 ± 0.06. This agrees with general relativity, which predicts a value of 0.4. Crucially, the measurement rules out the tensor, vector scalar (TeVeS) model of modified gravity, which has an EG of 0.22 and does not need dark matter. The result does not, however, preclude the f(R) theory – which is more similar to general relativity and has EG values in the 0.328–0.365 range.
  • pacome delva on 16 Mar 10
     
    mmm, i wonder if this study takes into account the non linearities studied in the Ariadna on galaxies...
  • LeopoldS on 16 Mar 10
     
    Luzi: any comment?
nikolas smyrlakis

mentored by the Advanced Concepts Team for Google Summer of Code 2010 - 4 views

socghop.appspot.com/...advancedconceptsteam

pagmo google summerofcode

shared by nikolas smyrlakis on 19 Mar 10 - Cached
LeopoldS liked it
  • nikolas smyrlakis on 19 Mar 10
     
    you propably already know,I post it for the twitter account and for your comments
  • ...4 more comments...
  • LeopoldS on 20 Mar 10
     
    once again one of these initiatives that came up from a situation and that would never have been possible with a top-down approach .... fantastic! and as Dario said: we are apparently where NASA still has to go with this :-)
  • Joris _ on 20 Mar 10
     
    Actually, NASA Ames did that already within the NASA Open Source Agreement in 2008 for a V&V software!
  • Joris _ on 20 Mar 10
  • LeopoldS on 20 Mar 10
     
    indeed ... you are right .... interesting project btw - they started in 1999, were in 2005 the first NASA project on Sourceforge and won several awards .... then this entry why they did not participate last year: "05/01/09: Skipping this years Google Summer-of-Code - many of you have asked why we are not participating in this years Summer of Code. The answer is that both John and Peter were too busy with other assignments to set this up in time. We will be back in 2010. At least we were able to compensate with a limited number of NASA internships to continue some of last years projects." .... but I could not find them in this years selected list - any clue?
  • LeopoldS on 20 Mar 10
     
    but in any case, according to the apple guru, Java is a dying technology, so their project might as well ...
  • Joris _ on 21 Mar 10
     
    They participate under the name "The Java Pathfinder Team" (http://babelfish.arc.nasa.gov/trac/jpf/wiki/events/soc2010). It is actually a very useful project for both education and industry (Airbus created a consortium on model checking soft, and there is a lot of research on it) As far as I know, TAS had some plans of using Java onboard spacecrafts, 2 years ago. Not sure the industry is really sensible about Jobs' opinions ;) particularly if there is no better alternative!
Joris _

Why space shuttle exhaust races to the poles - space - 30 March 2010 - New Scientist - 6 views

www.newscientist.com/...xhaust-races-to-the-poles.html

weather nasa

shared by Joris _ on 31 Mar 10 - Cached
LeopoldS liked it
  • LeopoldS on 31 Mar 10
     
    the new scientist article does not say much but maybe the paper could be of interest to our models - Nina and Friederike, please have a look at it - hope that you can get hold of it ...
Juxi Leitner

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 ...
pacome delva

Physicists study how moral behaviour evolved - 2 views

physicsworld.com/...42540

phy ia cooperation

shared by pacome delva on 07 May 10 - Cached
  • A statistical-physics-based model may shed light on the age-old question "how can morality take root in a world where everyone is out for themselves?" Computer simulations by an international team of scientists suggest that the answer lies in how people interact with their closest neighbours rather than with the population as a whole.
  • pacome delva on 07 May 10
     
    Reminds me something... :)
  • nikolas smyrlakis on 07 May 10
     
    I check diigo for the first time since I left and my spirit is still there yeah !
Dario Izzo

In the Blink of Bird’s Eye, a Model for Quantum Navigation | Wired Science ... - 2 views

m.wired.com/...quantum-birds

shared by Dario Izzo on 30 Jan 11 - No Cached
  • Dario Izzo on 30 Jan 11
     
    very ACTish
Loretta Latronico Poulain

Behavioural Economics? Try Biological Economics - 2 views

ipezone.blogspot.com/...-economics-try-biological.html

science fun

shared by Loretta Latronico Poulain on 08 Mar 11 - No Cached
  • Luís F. Simões on 08 Mar 11
     
    The "Biological Economics" thing is a hyping (or misunderstanding) of the BBC article. The work it refers to seems to be an application of Complex Networks theory to financial networks. I found what appear to be some of the related publications: Andrew G. Haldane (April 2009) Rethinking the financial network (further references in the footnote to page 10) Erlend Nier, Jing Yang, Tanju Yorulmazer and Amadeo Alentorn (April 2008) Network models and financial stability Funny how these issues have been repeatedly popping up at the ACT in recent weeks. This connects both with the discussions on information spreading in networks, and with roadmaps' robustness.
Nicholas Lan

prediction markets - 2 views

www.intrade.com/home

fun economics

shared by Nicholas Lan on 24 Feb 11 - No Cached
  • Nicholas Lan on 24 Feb 11
     
    talking of interesting business models - > futures markets for whether or not despots will still be in power by the end of the year. Markets>Foreign Affiars/International security
  • Ma Ru on 25 Feb 11
     
    "Challenge the Intrade Crowd with Your Wisdom"... Yeah...
pacome delva

Will the LHC find supersymmetry? - 0 views

physicsworld.com/...45182

phy supersymmetry lhc

shared by pacome delva on 25 Feb 11 - No Cached
  • But not everyone is optimistic about discovering SUSY. "We will get in a crisis, I think, in a few years," Dorigo predicts, sceptical of the theory because it introduces so many new particles of which data presently show "no hints". However, even though he would lose a $1000 bet, he says that he would still be among the first celebrating if the LHC does turn up sparticles.
  • Luzi Bergamin on 25 Feb 11
     
    Certainly too early for a definite answer, they will keep us in suspense for another few years. But don't worry, whatever is found, Arkani-Hamed will have at least 50 models that can explain this...
santecarloni

[1108.4299] A Memristive Model Compatible with Triplet Rule for Spike-Timing-Dependent-... - 0 views

arxiv.org/1108.4299

science

shared by santecarloni on 30 Aug 11 - No Cached
  • santecarloni on 30 Aug 11
     
    more on memristors...
Francesco Biscani

Why three buses come at once, and how to avoid it - physics-math - 29 October 2009 - Ne... - 4 views

www.newscientist.com/...-once-and-how-to-avoid-it.html

shared by Francesco Biscani on 29 Oct 09 - Cached
  • Now systems complexity researchers Carlos Gershenson and Luis Pineda of the National Autonomous University of Mexico have devised a mathematical model that shows how the problem might be prevented
  • Francesco Biscani on 29 Oct 09
     
    This is from Carlos, the guy who gave a science coffee talk a couple of months ago.
Joris _

Analytics: Math, Operations Research, Statistics Driving Business - 0 views

analyticsmagazine.com

shared by Joris _ on 31 Aug 09 - Cached
  • Joris _ on 31 Aug 09
     
    A very interesting electronic magazine focusing on how using data, modeling, and mathematical analysis to drive business decisions.
LeopoldS

NASA - Climate Simulation Computer Becomes More Powerful - 0 views

www.nasa.gov/...climate_computing.html

climate modelling Earth System Sciences

shared by LeopoldS on 28 Aug 09 - Cached
  • LeopoldS on 28 Aug 09
     
    just to make Nina and Friederike envious ...
Joris _

Ion trap quantum computing - 0 views

www.physorg.com/news161348276.html

shared by Joris _ on 14 May 09 - Cached
  • One of the most important considerations in quantum computing is the fact that quantum computing scales polynomially, rather than exponentially, as classical computing does
  • his process would allow us to take problems of great complexity and still solve them on a humanly possible timescale. This could provide the key to modeling complex systems - especially perhaps in biology - that we can’t solve now. This would be a tremendous advantage over classical computing.
  • Joris _ on 14 May 09
     
    a follow-up question: Can quantum computer be efficient for global optimisation ?
LeopoldS

NHESS - Home - 0 views

www.natural-hazards-and-earth-system-sciences.net

Earth System Sciences natural disasters modelling environment systems

shared by LeopoldS on 13 May 09 - Cached
  • LeopoldS on 13 May 09
     
    especially interesting also for the two new girls, Nina and Friedericke joigning us in a few weeks ...
nikolas smyrlakis

Top 10 disappointing technologies - News - PC Authority - 0 views

www.pcauthority.com.au/...isappointing-technologies.aspx

innovation disruptive technologies failure

shared by nikolas smyrlakis on 18 May 09 - Cached
  • Taiwanese robbers reportedly cut the finger of a man whose car had a fingerprint ignition, something that led scanner manufacturers to install a temperature sensor in future models to prevent a repeat.
ESA ACT

Computer Model Points To the Missing Matter - 0 views

www.journals.uchicago.edu/...522912

PHY supercomputing

shared by ESA ACT on 24 Apr 09 - Cached
  • ESA ACT on 24 Apr 09
     
    Unlike many previous studies of this type, our simulation includes unbound gas, where an appreciable fraction of the baryons in the universe reside.
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