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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 !
LeopoldS

Experimental Detection of Trinitramide, N(NO2)3 - Rahm - 2010 - Angewandte Chemie Inter... - 0 views

onlinelibrary.wiley.com/...abstract

PHY PRO propulsion space NRG

shared by LeopoldS on 09 Jan 11 - No Cached
  • LeopoldS on 09 Jan 11
     
    Dejan have a look at this ...
  • dejanpetkow on 10 Jan 11
     
    Would be nice to have some cross sections or transition probabilities for the possible transition (or decomposition) channels. But anyway, HEDM is one of the key short/mid-term topics in advanced energy, power, and/or propulsion.
Luís F. Simões

The Fantastical Promise of Reversible Computing  - Technology Review - 2 views

www.technologyreview.com/...26308

INF reversible logic computing chip electronics quantum cellular_automata

shared by Luís F. Simões on 25 Jan 11 - No Cached
  • Reversible logic could cut the energy wasted by computers to zero. But significant challenges lie ahead.
  • By some estimates the difference between the amount of energy required to carry out a computation and the amount that today's computers actually use, is some eight orders of magnitude. Clearly, there is room for improvement.
  • There are one or two caveats, of course. The first is that nobody has succeeded in building a properly reversible logic gate so this work is entirely theoretical. But there are a number of computing schemes that have the potential to work like this. Thapliyal and Ranganathan point in particular to the emerging technology of quantum cellular automata and show how their approach might be applied.
  • ...1 more annotation...
  • Ref: arxiv.org/abs/1101.4222: Reversible Logic Based Concurrent Error Detection Methodology For Emerging Nanocircuits
  • Dario Izzo on 26 Jan 11
     
    We did look at making computation powers more efficient from the bio perspective (efficiency of computations in brain). This paper was actually the base for our discussion on a new approsach to computing http://atlas.estec.esa.int/ACTwiki/images/6/68/Sarpeshkar.pdf and led to several ACT internal studies
  • Luís F. Simões on 26 Jan 11
     
    here is the paper I told you about, on the computational power of analog computing: http://dx.doi.org/10.1016/0304-3975(95)00248-0 you can also get it here: http://www.santafe.edu/media/workingpapers/95-09-079.pdf
Luís F. Simões

Boeing probes international market for human spacecraft - 1 views

spaceflightnow.com/...10cst100

human spaceflight commercial spaceflight

shared by Luís F. Simões on 11 Feb 11 - No Cached
  • The aerospace powerhouse is designing and testing systems for its CST-100 space capsule, a craft the company says could begin flying astronauts to low Earth orbit by 2015. It will launch on existing rockets to lessen development risk and costs.
  • "The spacecraft that we're designing is rocket-agnostic. It would be possible to sell this like a commercial airplane to countries who perhaps have a launch vehicle who would like to launch it in their own country."
  • Luís F. Simões on 11 Feb 11
     
    ...and hitting the news in the same day: A Rocket Built from U.S. and European Parts "A new rocket that would combine parts from NASA's canceled Ares I rocket as well as the Ariane 5 , a well-proven European satellite launcher, could provide a low-cost option for taking crew and cargo to the space station. The rocket proposal was announced this week by ATK, an aerospace and defense company that manufactures the solid rocket motors for NASA's space shuttles, and Astrium, the European company that makes the Ariane 5. They say the rocket, called Liberty, would be ready for flight by 2015." "Other commercial companies, including Boeing and Orbital Sciences Corporation, are looking to use low-end versions of the Atlas V to carry the capsules they are building. Liberty could carry any capsule at a cost less than that of the Atlas V, according to ATK." Look! Competition! :)
Luís F. Simões

William Shatner Wakes Up Crew for Final Discovery Mission - Slashdot - 1 views

idle.slashdot.org/...ew-for-Final-Discovery-Mission

Space shuttle sci-fi Star Trek fun

shared by Luís F. Simões on 07 Mar 11 - No Cached
  • The Space Shuttle Discovery left the International Space Station this morning for the last time. To commemorate the ship's accomplishments over 27 years of service, the crew was greeted to a morning wake-up message from Capt. Kirk. "Space, the final frontier," Shatner said in a prerecorded message. "These have been the voyages of the space shuttle Discovery. Her 30-year mission: to seek out new science, to build new outposts, to bring nations together on the final frontier, to boldly go and do what no spacecraft has done before."
  • Luís F. Simões on 07 Mar 11
     
    here's a recording of the transmission: http://ia600406.us.archive.org/13/items/STS-133/03-07-11_STS-133_FD12_Crew_Wakeup.mp3 to quote from the thread at reddit: "When the space shuttle first flew, 55 americans were being held hostage in the embassy in Iran, and Ronald Reagan had just become president. That same year Prince Charles would marry Lady Diana, the HIV virus would be first identified, Post-It notes were invented, and a small company called Microsoft released it's new operating system MS-DOS."
  • Francesco Biscani on 07 Mar 11
     
    Speaking of William Shatner, the legendary "Rocket Man": http://www.youtube.com/watch?v=5hARDXYz2io
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...
Luís F. Simões

Shell energy scenarios to 2050 - 6 views

www.shell.com/...shell_energy_scenarios_2050

energy future forecast politics economy climate_change

shared by Luís F. Simões on 09 Mar 11 - No Cached
  • Luís F. Simões on 09 Mar 11
     
    just in case you were feeling happy and optimistic
  • ...7 more comments...
  • Francesco Biscani on 09 Mar 11
     
    An energy scenario published by an oil company? Allow me to be sceptical...
  • Joris _ on 10 Mar 11
     
    Indeed, Shell is an energy company, not just oil, for some time now ... The two scenarii are, in their approach, dependant of economic and political situation, which is right now impossible to forecast. Reference to Kyoto is surprising, almost out-dated! But overall, I find it rather optimistic at some stages, and probably the timeline (p37-39) is unlikely with recent events.
  • Luís F. Simões on 10 Mar 11
     
    the report was published in 2008, which explains the reference to Kyoto, as the follow-up to it was much more uncertain at that point. The Blueprint scenario is indeed optimistic, but also quite unlikely I'd say. I don't see humanity suddenly becoming so wise and coordinated. Sadly, I see something closer to the Scramble scenario as much more likely to occur.
  • LeopoldS on 12 Mar 11
     
    not an oil company??? please have a look at the percentage of their revenues coming from oil and gas and then compare this with all their other energy activities together and you will see very quickly that it is only window dressing ... they are an oil and gas company ... and nothing more
  • Joris _ on 14 Mar 11
     
    not JUST oil. From a description: "Shell is a global group of energy and petrochemical companies." Of course revenues coming from oil are the biggest, the investment turnover on other energy sources is small for now. Knowing that most of their revenues is from an expendable source, to guarantee their future, they invest elsewhere. They have invested >1b$ in renewable energy, including biofuels. They had the largest wind power business among so-called "oil" companies. Oil only defines what they do "best". As a comparison, some time ago, Apple were selling only computers and now they sell phones. But I would not say Apple is just a phone company.
  • LeopoldS on 14 Mar 11
     
    window dressing only ... e.g. Net cash from operating activities (pre-tax) in 2008: 70 Billion$ net income in 2008: 26 Billion revenues in 2008: 88 Billion Their investments and revenues in renewables don't even show up in their annual financial reports since probably they are under the heading of "marketing" which is already 1.7 Billion $ ... this is what they report on their investments: Capital investment, portfolio actions and business development Capital investment in 2009 was $24 billion. This represents a 26% decrease from 2008, which included over $8 billion in acquisitions, primarily relating to Duvernay Oil Corp. Capital investment included exploration expenditure of $4.5 billion (2008: $11.0 billion). In Abu Dhabi, Shell signed an agreement with Abu Dhabi National Oil Company to extend the GASCO joint venture for a further 20 years. In Australia, Shell and its partners took the final investment decision (FID) for the Gorgon LNG project (Shell share 25%). Gorgon will supply global gas markets to at least 2050, with a capacity of 15 million tonnes (100% basis) of LNG per year and a major carbon capture and storage scheme. Shell has announced a front-end engineering and design study for a floating LNG (FLNG) project, with the potential to deploy these facilities at the Prelude offshore gas discovery in Australia (Shell share 100%). In Australia, Shell confirmed that it has accepted Woodside Petroleum Ltd.'s entitlement offer of new shares at a total cost of $0.8 billion, maintaining its 34.27% share in the company; $0.4 billion was paid in 2009 with the remainder paid in 2010. In Bolivia and Brazil, Shell sold its share in a gas pipeline and in a thermoelectric power plant and its related assets for a total of around $100 million. In Canada, the Government of Alberta and the national government jointly announced their intent to contribute $0.8 billion of funding towards the Quest carbon capture and sequestration project. Quest, which is at the f
  • Joris _ on 14 Mar 11
     
    thanks for the info :) They still have their 50% share in the wind farm in Noordzee (you can see it from ESTEC on a clear day). Look for Shell International Renewables, other subsidiaries and joint-ventures. I guess, the report is about the oil branch. http://sustainabilityreport.shell.com/2009/servicepages/downloads/files/all_shell_sr09.pdf http://www.noordzeewind.nl/
  • LeopoldS on 16 Mar 11
     
    no - its about Shell globally - all Shell .. these participations are just peanuts please read the intro of the CEO in the pdf you linked to: he does not even mention renewables! their entire sustainability strategy is about oil and gas - just making it (look) nicer and environmentally friendlier
  • Joris _ on 16 Mar 11
     
    Fair enough, for me even peanuts are worthy and I am not able to judge. Not all big-profit companies, like Shell, are evil :( Look in the pdf what is in the upstream and downstream you mentionned above. Non-shell sources for examples and more objectivity: http://www.nuon.com/company/Innovative-projects/noordzeewind.jsp http://www.e-energymarket.com/news/single-news/article/ferrari-tops-bahrain-gp-using-shell-biofuel.html thanks.
LeopoldS

Personal DNA Sequencing Machine One Step Closer - International Business Times - 0 views

www.ibtimes.com/...ng-machine-one-step-closer.htm

bio technology INF NAN

shared by LeopoldS on 25 Jul 11 - No Cached
  • LeopoldS on 25 Jul 11
     
    1000$ DNA sequencing costs - what you never wanted to know about your DNA ....
LeopoldS

pH-Dependent Dimerization and Salt-Dependent Stabilization of the N-terminal Domain of ... - 3 views

onlinelibrary.wiley.com/...abstract

shared by LeopoldS on 22 Aug 11 - No Cached
  • LeopoldS on 22 Aug 11
     
    how the spider silk gets so strong ...
  • jmlloren on 24 Aug 11
     
    C'mon Leopold! It is obvious from the title.
  • LeopoldS on 27 Aug 11
     
    :-)
pacome delva

Orbiting standards lab could improve climate predictions - physicsworld.com - 2 views

physicsworld.com/...47305

climate_change

shared by pacome delva on 30 Sep 11 - No Cached
  • Policy makers would be much better placed to combat the effects of global warming if scientists had access to accurate measurements of the Earth's radiation balance from a dedicated satellite, claims an international group of physicists.
  • it estimates that the satellite could cut a decade or more from the time needed to make useful projections of global temperature at the end of the 21st century.
Dario Izzo

Nobel Laureate Ivar Giaever Quits Physics Group over Stand on Global Warming - Internat... - 1 views

www.ibtimes.com/...-prize-winner-physicist-re.htm

shared by Dario Izzo on 15 Sep 11 - No Cached
  • Dario Izzo on 15 Sep 11
     
    mmm .. people are making a lot of overstatments on the issue ....
LeopoldS

NASA - NASA Announces International Space Apps Competition - 2 views

www.nasa.gov/...HQ_11-313_Space_Apps.html

INF science space fun

shared by LeopoldS on 21 Sep 11 - No Cached
  • LeopoldS on 21 Sep 11
     
    can we participate with a "thespacegame" app?
Nina Nadine Ridder

Geoengineer climate? Obama aide won't rule out - Climate Change- msnbc.com - 0 views

www.msnbc.msn.com/30112396

Geoengineering US_climate_policy

shared by Nina Nadine Ridder on 16 Jul 09 - No Cached
  • LeopoldS on 19 Jul 09
     
    very interesting article indeed - good basis for our own assessment! check especially this part: "At an international meeting of climate scientists last month in Copenhagen, 15 talks dealt with different aspects of geoengineering." do you have the references?
  • Nina Nadine Ridder on 20 Jul 09
     
    I found the abstracts for this meeting online (http://www.iop.org/EJ/toc/1755-1315/6/45). I'm also looking for the papers which relate to the different talks. These could be helpfull too.
Juxi Leitner

Armadillo Aerospace Claim Level 2 NGLLC Prize | International Space Fellowship - 0 views

spacefellowship.com/...pace-claim-level-2-ngllc-prize

llc lunar lander x-prize armadillo

shared by Juxi Leitner on 13 Sep 09 - Cached
  • Juxi Leitner on 13 Sep 09
     
    Armadillo Aerospace have officially completed the 2009 Northrop Grumman Lunar Lander Challenge Level 2, on a rainy day at Caddo Mills, Texas. Reports came in
ESA ACT

Dynamics of phononic dissipation at the atomic scale: Dependence on internal degrees of... - 0 views

scitation.aip.org/...GetabsServlet

nan

shared by ESA ACT on 24 Apr 09 - No Cached
  • ESA ACT on 24 Apr 09
     
    Dynamics of dissipation local vibrations to the surrounding substrate is a key issue in friction between sliding surfaces as well as in boundary lubrication.
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