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robots.net - Robots: Swarming Satellites - 0 views

robots.net/2999.html tech swarm satellites robots
shared by Juxi Leitner on 04 Mar 10 - Cached
  • Juxi Leitner on 04 Mar 10
     
    nice podcast to hear also what there plans for the future are
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ScienceDirect - Current Biology : The missing climate change policy - 2 views

www.sciencedirect.com/science climate change
shared by Christos Ampatzis on 09 Mar 10 - No Cached
Nicholas Lan liked it
  • Christos Ampatzis on 09 Mar 10
     
    "Affluent western individuals are increasingly fretting about the carbon dioxide emissions from their lifestyle and energy use but one key issue, having fewer children, is little considered. " If sb has access to the article... Having fewer children as a solution to climate change makes me curious...
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Common ecology quantifies human insurgency : Article : Nature - 0 views

www.nature.com/...nature08631.html modelling war defence
shared by LeopoldS on 07 Jan 10 - Cached
  • LeopoldS on 07 Jan 10
     
    nice paper: like especially: To our knowledge, our model provides the first unified explanation of high-frequency, intra-conflict data across human insurgencies. Other explanations of human insurgency are possible, though any competing theory would also need to replicate the results of Figs 1, 2, 3. Our model's specific mechanisms challenge traditional ideas of insurgency based on rigid hierarchies and networks, whereas its striking similarity to multi-agent financial market models24, 25, 26 hints at a possible link between collective human dynamics in violent and non-violent settings1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19. Top of page
  • pacome delva on 07 Jan 10
     
    There was also this paper ... Power Law Explains Insurgent Violence (http://sciencenow.sciencemag.org/cgi/content/full/2009/1216/1?rss=1)
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TeamParis-SynthEthics - 5 views

2009.igem.org/...TeamParis-SynthEthics.pdf bio human_sciences ethics
shared by pacome delva on 27 Nov 09 - No Cached
  • pacome delva on 27 Nov 09
     
    This is an interesting report from a student in sociology, who worked with a group of scientists on a synthetic biology project for the competition IGEM (http://2009.igem.org/Main_Page). This is what happen when you mix hard and soft sciences. For this project they won the special prize for "Best Human Practices Advance". You can read the part on self or exploded governance (p.34). When reading parts of this reports, I thought that it could be good to have a stagiaire or a YGT in human science to see if we can raise interesting question about ethics for the space sector. There are many questions I'm sure, about the governance, the legitimacy of spending millions to go in space, etc...
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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!
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Pi Computation Record - 4 views

bellard.org/pi2700e9 inf
shared by Francesco Biscani on 06 Jan 10 - Cached
  • Francesco Biscani on 06 Jan 10
     
    For Dario: the PI computation record was established on a single desktop computer using a cache optimized algorithm. Previous record was obtained by a cluster of hundreds of computers. The cache optimized algorithm was 20 times faster.
  • ...6 more comments...
  • Ma Ru on 06 Jan 10
     
    Teeeeheeeeheeee... assembler programmers greet Java/Python/Etc. programmers :)
  • Dario Izzo on 07 Jan 10
     
    And he seems to have done everything in his free time!!! I like the first FAQ.... "why did you do it?"
  • nikolas smyrlakis on 07 Jan 10
  • LeopoldS on 07 Jan 10
     
    did you read any of the books he recommends? suggest: Modern Computer Arithmetic by Richard Brent and Paul Zimmermann, version 0.4, November 2009, Full text available here. The Art of Computer Programming, volume 2 : Seminumerical Algorithms by Donald E. Knuth, Addison-Wesley, third edition, 1998. More information here.
  • LeopoldS on 07 Jan 10
     
    btw: we will very soon have the very same processor in the new iMac .... what record are you going to beat with it?
  • Francesco Biscani on 08 Jan 10
     
    Zimmerman is the same guy behind the MPFR multiprecision floating-point library, if I recall correctly: http://www.mpfr.org/credit.html I've not read the book... Multiprecision arithmetic is a huge topic though, at least from the scientific and number theory point of view if not for its applications to engineering problems. "The art of computer programming" is probably the closest thing to a bible for computer scientists :)
  • Francesco Biscani on 08 Jan 10
     
    "btw: we will very soon have the very same processor in the new iMac .... what record are you going to beat with it?" Fastest Linux install on an iMac :)
  • Juxi Leitner on 08 Jan 10
     
    "Fastest Linux install on an iMac :)" that is going to be a though one but a worthy aim! ""The art of computer programming" is probably the closest thing to a bible for computer scientists :)" yep! Programming is art ;)
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Higgs hunters face long haul - 2 views

physicsworld.com/...41631 phy higgs particles
shared by pacome delva on 05 Feb 10 - Cached
  • to reduce the chances of the LHC being derailed again by a similar accident, physicists at the Geneva lab have decided to run the collider at just half its design energy for the next 18-24 months.
  • Once the 7 TeV run is over, CERN will shut the LHC down in 2012 for a year or more to prepare it to go straight to maximum-energy 14 TeV collisions in 2013. This will be a complex job that will involve replacing some 10,000 superconducting magnet connections with more robust ones.
  • choosing to stay at lower energies is a big price to pay in terms of the Higgs search. "We will need more than twice the data at 7 TeV compared to that needed at 10 TeV to reach the same discovery potential," she says. "At this energy we can at best expect to exclude a Higgs with a mass between 155 and 175 GeV."
  • pacome delva on 05 Feb 10
     
    no Higgs boson before 2013... and a replacement of 10,000 superconducting magnet connections ! Reminds me of the the gravitational detectors... no detection before an upgrade in 2013...! There are the big announcements to make the cash flow... and reality !
  • Luzi Bergamin on 05 Feb 10
     
    Higgs is almost 81, so he should better invest in his health if he wants the Nobel prize... But who cares, it's another 5 years window where high-energy theorists can produce nonsense with no experimental evidence. They should be happy!
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NASA Launches New Site Against Climate Change - It is aimed at educating children - Sof... - 0 views

news.softpedia.com/...st-Climate-Change-133454.shtml climate_research education climate_change NASA
shared by Nina Nadine Ridder on 29 Jan 10 - Cached
  • Nina Nadine Ridder on 29 Jan 10
     
    with a link to the very cute web page for kids (might be interesting for some of you when your daughters are a little older ;) )
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NASA budget for 2011 eliminates funds for manned lunar missions - washingtonpost.com - 3 views

www.washingtonpost.com/...AR2010013101058.html
shared by Joris _ on 01 Feb 10 - Cached
  • NASA's grand plan to return to the moon, built on President George W. Bush's vision of an ambitious new chapter in space exploration, is about to vanish with hardly a whimper
  • a commercial spacecraft that could taxi astronauts into low Earth orbit
  • Obama budget as disastrous for human space fligh
  • Francesco Biscani on 01 Feb 10
     
    Personally I think this is great.
  • ...1 more comment...
  • Joris _ on 01 Feb 10
     
    what is great exactly ? No human beings will put a foot on the Moon, or Mars, in the next 22 yrs and more ... what an awful waste!
  • Francesco Biscani on 01 Feb 10
     
    Well, the constellation program was a waste of money in its current form, overrun by delays and insufficient budget. We would have had Apollo 2.0 sixty years later, for what? At least now they are talking about going to asteroids, martian moons and stuff like that.
  • Joris _ on 01 Feb 10
     
    I agree that Constellation was a mistake. It is though a pity that now human Mars missions would certainly happen even later than initially hoped.
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What Should We Teach New Software Developers? Why? | January 2010 | Communications of t... - 3 views

cacm.acm.org/...fulltext inf
shared by Francesco Biscani on 15 Jan 10 - Cached
Dario Izzo liked it
  • Industry wants to rely on tried-and-true tools and techniques, but is also addicted to dreams of "silver bullets," "transformative breakthroughs," "killer apps," and so forth.
  • This leads to immense conservatism in the choice of basic tools (such as programming languages and operating systems) and a desire for monocultures (to minimize training and deployment costs).
  • The idea of software development as an assembly line manned by semi-skilled interchangeable workers is fundamentally flawed and wasteful.
  • Francesco Biscani on 15 Jan 10
     
    Nice opinion piece by the creator of C++ Bjarne Stroustrup. Substitute "industry" with "science" and many considerations still apply :)
  • Juxi Leitner on 18 Jan 10
     
    "for many, "programming" has become a strange combination of unprincipled hacking and invoking other people's libraries (with only the vaguest idea of what's going on). The notions of "maintenance" and "code quality" are typically forgotten or poorly understood. " ... seen so many of those students :( and ad "My suggestion is to define a structure of CS education based on a core plus specializations and application areas", I am not saying the austrian university system is good, but e.g. the CS degrees in Vienna are done like this, there is a core which is the same for everybody 4-5 semester, and then you specialise in e.g. software engineering or computational mgmt and so forth, and then after 2 semester you specialize again into one of I think 7 or 8 master degrees ... It does not make it easy for industry to hire people, as I have noticed, they sometimes really have no clue what the difference between Software Engineering is compared to Computational Intelligence, at least in HR :/
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NASA will miss Congressional deadline for asteroid tracking - Science Fair - USATODAY.com - 0 views

blogs.usatoday.com/...ine-for-asteroid-tracking.html MAD NEO
shared by Joris _ on 25 Jan 10 - Cached
  • he panel finds the 2005 order to find 90% of Earth-threatening asteroids 460 feet or larger infeasible,
  • No method for diverting asteroids has been experimentally demonstrated
  • Options include a "gravity tractor" orbiting slow-moving objects and tugging them off course with tidal tugs, a "kinetic" impact of a heavy spacecraft into an asteroid, or a nuclear explosion
  • ...1 more annotation...
  • Unlike the dinosaurs, we are smart enough to do the math and figure out the answer that modest resources should be dedicated to the problem
    • Joris _
      Joris _ on 25 Jan 10
       
      "we are smart enough" is a completely subjective comment. Reading the article it does not give the same impression :|
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FT.com / Technology - Facebook becomes bigger hit than Google - 1 views

www.ft.com/...f7-11df-b057-00144feabdc0.html technology facebook google hitwise
shared by nikolas smyrlakis on 17 Mar 10 - Cached
  • nikolas smyrlakis on 17 Mar 10
     
    In a sign that the web is becoming more sociable than searchable Although Facebook is enjoying rapid growth, it is only beginning to cash in on its success. Revenues at the social media company are estimated to be in the range of $1bn to $1.5bn this year, while Google took in $23.7bn last year.
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BBC NEWS | Technology | Down on the farm with the robots - 1 views

news.bbc.co.uk/...8558095.stm GPS robots agriculture
shared by Christos Ampatzis on 12 Mar 10 - Cached
  • Christos Ampatzis on 12 Mar 10
     
    - Smart Tractors?!?!? - "Guidance systems are enablers," said Mr James. "Farmers buy them with one job in mind and then realise they can use it for lots more."
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Are cosmic rays really causing Toyota's woes? | freep.com | Detroit Free Press - 2 views

www.freep.com/...ys-really-causing-Toyotas-woes space electronic
shared by Joris _ on 16 Mar 10 - Cached
LeopoldS liked it
  • Luzi Bergamin on 16 Mar 10
     
    Sounds like one of Calvin's alibis: Aliens! Dad, aliens! A sarcastic Venusian entered the kitchen...
  • nikolas smyrlakis on 16 Mar 10
     
    i think they could also be a cause for Greece's economic crisis
  • Luzi Bergamin on 16 Mar 10
     
    Well, then I suggest to elect Spaceman Spiff instead of Papandreou as Prime Minister! :-)
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artificial inorganic leaf (AIL) - 1 views

www.sciencedaily.com/...100325131549.htm nrg nan bio
shared by Nicholas Lan on 29 Mar 10 - Cached
  • Nicholas Lan on 29 Mar 10
     
    bit confused about what they actually have achieved so far but sounds like it might turn out to be interesting. "The scientists first infiltrated the leaves of Anemone vitifolia -- a plant native to China -- with titanium dioxide in a two-step process. Using advanced spectroscopic techniques, the scientists were then able to confirm that the structural features in the leaf favorable for light harvesting were replicated in the new TiO2 structure. Excitingly, the AIL are eight times more active for hydrogen production than TiO2 that has not been "biotemplated" in that fashion. AILs also are more than three times as active as commercial photo-catalysts. Next, the scientists embedded nanoparticles of platinum into the leaf surface. Platinum, along with the nitrogen found naturally in the leaf, helps increase the activity of the artificial leaves by an additional factor of ten."
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New Intel Sensor Could Cut Electricity Bill - 3 views

www.livescience.com/...t-electricity-bill-100417.html nrg power_management
shared by pacome delva on 19 Apr 10 - Cached
  • Once connected, the sensor will wirelessly connect to all electrical devices in the house and self configure to record the voltages from each source in real time.
  • Joris _ on 19 Apr 10
     
    "The first thing everyone did after seeing the energy graph on the family PC was to turn off the lights". Kind-of we are becoming slaves of the technology. Do we really need a sensor to tell us to turn-off the light when we are leaving the room!?
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3D invisibility cloak unveiled - physicsworld.com - 1 views

physicsworld.com/...42043 transformation_optics cloaking
shared by pacome delva on 29 Mar 10 - Cached
  • For Wegener the aim of the work is not about focusing all efforts on creating invisibility cloaks, but is about exploring a range of applications in transformation optics. This involves calculating what kind of material is needed to bend light in a certain way, by considering light trajectories as the result of the warping of space. Wegener says that transformation optics should lead, for example, to the design of better antennas or smaller optical resonators.
  • Luzi Bergamin on 29 Mar 10
     
    We don't have Science Express subscription here, so I have to wait till the normal paper is out. From what I heard about it, I doubt that this would have made it to Science without the names Pendry and Wegener in the autor list! Certainly, they are two of the smartest guys in Metamaterials, but they are also two of the absolut class A sellers. Pendry by definition is the first in whatever (at least in HIS talks...) but apart from this he's a very nice guy. Better let's not try to characterize Wegener...
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Green patents corralled : Nature News - 0 views

www.nature.com/...465021a.html renewable_energy_technologies patents
shared by Friederike Sontag on 10 May 10 - No Cached
  • Friederike Sontag on 10 May 10
     
    "Patents, licensing practices and technology transfer from rich to poor countries are major issues in the fight against climate change," says Ahmed Abdel Latif, the programme manager for intellectual property at the International Centre for Trade and Sustainable Development
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Synthetic Genome Brings New Life to Bacterium - 0 views

www.sciencemag.org/...958 bio genomics ethics
shared by pacome delva on 21 May 10 - Cached
LeopoldS liked it
  • For 15 years, J. Craig Venter has chased a dream: to build a genome from scratch and use it to make synthetic life. Now, he and his team at the J. Craig Venter Institute (JCVI) in Rockville, Maryland, and San Diego, California, say they have realized that dream.
  • "One thing is sure," Boeke says. "Interesting creatures will be bubbling out of the Venter Institute's labs."
  • pacome delva on 21 May 10
     
    wow, a big step in genomics...!
  • Ma Ru on 21 May 10
     
    But isn't it just yet another word abuse? From what I understand, they just synthesised a genome identical to the one of an existing bacteria... while undoubtedly nice work, this is *very* far from "creating life from scratch"... The fact that you are able to copy something, doesn't mean you understand how it works...
  • pacome delva on 27 May 10
     
    well of course we are far from engineering specific functions, and this is just a copy of a function that already existed. However it is quite impressive and the first time it is done. And the challenge here is not really to "copy" the ADN, but the fact that it works... in other words it is not because you copy the ADN identically that the phenotype (traduction of the ADN) will be the same, which is the case in this experiment.
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Open Source Satellite Initiative | machine project - 3 views

machineproject.com/...satellite education tech outreach satellites DIY
shared by Juxi Leitner on 20 May 10 - Cached
LeopoldS liked it
  • Juxi Leitner on 20 May 10
     
    All the satellite-related systems (except for the rocket to launch it) are DIY programs -- designed so that regular people may also have the chance of developing and eventually launching their own.
  • ...2 more comments...
  • Joris _ on 20 May 10
     
    The book is actually funny to read ... but this is not serious! Is it ?
  • Juxi Leitner on 20 May 10
  • Joris _ on 20 May 10
     
    I was saying that mainly because of some flaws - the piggy-pack installation, no dedicated stage, the limited control, ... It is so far very funny, but once he can fill all the gaps, it should be an excellent initiative - although careful about the debris if anyone has its own ;p
  • LeopoldS on 26 May 10
     
    his quote: "when art becomes practical, we call it technology; when technology becomes useless, we call it art" ... this is probably the later one ....
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