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pacome delva

Condensation transition in networks and other complex systems - 4 views

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    I like this work... it mixes physics, networks and biology ! Anyone heard about her ? Here's an interesting paper found on this website: http://nuweb.neu.edu/gbianconi/condensation.pdf
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    Eh... Barabasi is really milking the golden cow :) It seems interesting, even if I don't remember enough from my statistical mechanics classes to truly understand it without a major effort. Maybe you could make a layman's science coffee about it?
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    yeah i could if there's enough interest...? do u know Barabasi ?
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    He's quite well known for his work on scale-free networks: http://en.wikipedia.org/wiki/Albert-L%C3%A1szl%C3%B3_Barab%C3%A1si He's applying them for everything and the kitchen sink :) We have a Barabasi-Albert network topology implemented in PaGMO...
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    We worked on this with Luzi a few years back ... while the analogy is original and interesting it fails to capture the dynamics of a network, e.g. if a network has hubs that grow and shrink .... Luzi worked on an extended model to solve this issue, but, if I remember correctly, he got stuck in a computationally very hard problem .... We intended to develop and use the extended model to define relevant characteristic of the ESA network formed by mail exchanges.....
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    ...but then the CMS YGT didn't really like the project
Ma Ru

Researcher Creates 'Facebook for Scientists' - 1 views

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    and we are of course there since some time :-) and even have our own group in there ... think that Tobias has first discovered it our group is: https://www.researchgate.net/group/ESA_Advanced_Concepts_Team/ everybody welcome to join ... though Ariadnet is better
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    So if I'm already on Ariadnet, there's no need for me to join this researchgate thingy? Pheew..
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    Very active group, it has exactly one member (Leo) and exactly zero (ZERO,0!!) posts since June 13, 2008!!! Well, sounds like a very typical ACT action in order to increase the key performance indicators :D.
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    Oh come on Luzi, don't be over-pessimistic! It's just because all activity takes place on Ariadnet ;-)
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    tsk tsk typical ex-ACT criticism.. Maybe for me too from next week;P
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    WRONG! You ignore the fact that I complained already while I was yet in the ACT!! Seriously: I clicked around in "ResearchGate" a little bit, couldn't find too many interesting things. Many scientists from India, Iran etc. desperately looking for contacts, retired engineers/scientists from industry that now remember that they were once at university and also quite a number of semi-crackpots. My honest conclusion: not a must. Btw: wish you a nice post-ACT depression! Keep a stiff upper lip, esp. in case you go back to Greece...
Nina Nadine Ridder

Why Explore Mars? : Discovery News - 5 views

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    "NASA's proposed budget for 2011 is $19 billion," Brown says. "That's about three weeks of the war in Iraq." + interesting video on new rover design ("tumbleweed" rover)
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    that's why I quit ESA - I'll join NATO, more promising career ahead
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    I thought you became an EC bureaucrat ...
Luzi Bergamin

Vivos Underground Survival Shelter Network for 2012 and Beyond - 0 views

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    The world will end on 21.12.2012, the Maya knew this (http://www.youtube.com/watch?v=04OilEWckAU in German,) so be prepared! There should be an extra shelter for all (Ex-)ACT members. This would be real fun!! Endless strategic meetings on how to survive after apocalypse!
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    No, Luzi, there was an error in the profecy transcription... they meant that Italy would end in 2012, not the world..... and they seem to be quite right according to most observers. I am actually surprised it lasted so long!!!
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    Of course one of the major reasons behind the apocalypse will be European football championship taking place in Poland+Ukraine...
pacome delva

Synthetic Genome Brings New Life to Bacterium - 0 views

  • 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."
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    wow, a big step in genomics...!
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    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...
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    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.
Francesco Biscani

The Semicolon Wars » American Scientist - 2 views

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    Pretty interesting piece on computer languages.
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    Yes, very good, but I don't get what all the fuss is about... everyone knows Python is the ultimate programming language! :) Follow up reading: If programming languages were religions... (quite accurate actually) Great quote from the article you linked to: In 1975 Edsger W. Dijkstra, a major figure in the structured-programming movement, wrote a memo titled "How Do We Tell Truths that Might Hurt?" The "truths" were mostly Dijkstra's opinions of programming languages; how he told them was very bluntly. Fortran is "an infantile disorder," PL/I "a fatal disease," APL "a mistake, carried through to perfection." Students exposed to COBOL "are mentally mutilated beyond hope of regeneration," he said. "The use of COBOL cripples the mind; its teaching should, therefore, be regarded as a criminal offense."
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    Fool! You can pry my templates from my cold dead hands!
pacome delva

Invisibility cloaks shield the large and visible - physicsworld.com - 1 views

  • Two independent groups of physicists have built invisibility cloaks that can shield large objects lying on a plane. These "carpet cloaks" are far closer to the intuitive idea of an invisibility cloak than devices previously built, they argue, because they hide objects that can be seen with the naked eye and do so at visible wavelengths. The cloaks are also relatively cheap and easy to make, being constructed from the natural material calcite.
  • The team used a technique known as transformation optics to design their cloak.
  • Tomas Tyc of Masaryk University in the Czech Republic, who was not a member of either group, thinks that the papers "describe important achievements in the area of experimental cloaking." But he maintains that a carpet cloak is quite different to a fully fledged Harry Potter-style invisibility cloak. He points out that a carpet cloak only really works when viewing an object – be it a rucksack or a sword on someone's back, for example – side on. Otherwise the object will appear flat but still be visible.
Joris _

The 2010 Global Innovation 1000: How the Top Innovators Keep Winning - 4 views

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    Paper Discussion Deck
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    despite being a consultancy paper, quite interesting ... " the success of these companies is not a matter of how much these companies spend on research and development, but rather how they spend it." could also be translated into: "you need us to tell you how to spend your R&D money" :-)
Nicholas Lan

Global Farming futures - 2 views

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    forecasting to 2050 wouldn't recommend the executive summary but the collection of reports seems to be quite comprehensive across a range of relevant areas "The Project has involved around 400 leading experts and stakeholders from about 35 countries across the world. Drawing upon over 100 peer-reviewed evidence paper commissioned by the Project which can be accessed in full here (hyperlink). "
Luís F. Simões

Shell energy scenarios to 2050 - 6 views

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    just in case you were feeling happy and optimistic
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    An energy scenario published by an oil company? Allow me to be sceptical...
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    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.
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    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.
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    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
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    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.
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    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
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    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/
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    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
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    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

NASA - Mars Science Laboratory, the Next Mars Rover - 4 views

shared by LeopoldS on 22 Jul 11 - No Cached
Marion Nachon liked it
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    forgot to put in my comment: they have chosen a nice landing site .... and quite late it seems to me ...
Dario Izzo

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

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    mmm .. people are making a lot of overstatments on the issue ....
LeopoldS

News - General: Winston the pigeon wings it - 0 views

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    I always new it - the future of telecom is with pigeons ... (what happened to our idea of the pigeon inspired navigator??)
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    Well, it's been newn... I mean known since computer networks were invented that it'll take them a long time to match with a throughput of a train carrying recorded media. The point is that throughput is not the only important parameter: the other is response time... (BTW let's see how this commenting feature works, not many folks seem to use it...)
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    I do use it quite regularily .... a train full of DVDs and flash drives, yes ok - but a pigeon!!!!
Francesco Biscani

Google Wave Preview - 2 views

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    Looks really cool! And it's open source :)
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    Don't know if you've noticed, but the current version is becoming more and more usable... did you try it already in your collaborative work?
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    We've used it a bit with Juxi and Leopold for the work on the new issue of acta futura, and I think it is quite nice. The problem right now is that only a few people in the team have an account (and I have exhausted my invitations). Maybe you have one or two you are willing to share? :)
LeopoldS

MUMPS : a parallel sparse direct solver - 0 views

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    of any interest to us?
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    This is an "old" stuff. It is used, as far as I remember, in IPOPT, the Interior Point OPTimiser, that I use quite often (e.g. gtoc4) ...
Juxi Leitner

Google's Go: A New Programming Language That's Python Meets C++ - 6 views

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    Big news for developers out there: Google has just announced the release of a new, open sourced programming language called Go. The company ...
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    Ugh... no operator overloading, no efficient generic programming and no lambda expressions... Only time will tell, but I don't understand who the intended audience is: I think that Python guys won't care about the (supposedly) increased performance (and you can interface C/C++ with Python easily) and that C++ programmers (I mean, the hardcore serious C++ Boost-like programmers, no the Java-like whiners :P) won't have their beloved templates pried from their cold dead hands with ease.
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    yeah though I think especially operator overloading is not going to be a main problem, it is as with the JS library though quite thinkable that lots of users will switch or use it (or being put to use it...) because it is done by Google
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    Having Google backing it will certainly help, even though they are presenting it as a "system level" (i.e., hard-core) language, and in that domain it is much more difficult to bullshit your way to a position of relevance. Look at Java: Sun pushed it like hell and it is certainly widely used in many contexts (corporate, web and embedded markets mostly), yet it completely failed to win the hearts of "open-source" developers (or, more generally, of those developers who are not forced to use it by virtue of some management-driven decision).
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    "or, more generally, of those developers who are not forced to use it by virtue of some management-driven decision" completely agree with that!!
nikolas smyrlakis

BBC NEWS | Asia-Pacific | Scientists bring snow to Beijing - 2 views

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    Did you know about this Weather Modification Office? Promising or dodgy?
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    Yes. In China it happens apparently quite often that weather is regionally modified, e.g. in order to have good weather conditions during certain events (like olympics in Beijing). But also in other countries weather modification is applied, for reasons of agriculture, pollution, skiing, etc. Obviously, one wonders on the environmental impact of such an artificial cloud feeding process with silver iodide. I just googled, stumbling upon this report http://www.weathermodification.org/AGI_toxicity.pdf which published the result: no environmentally harmful effects...
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    and w.r.t. ur question: I mean different weather conditions which we experience locally (like droughts or other extreme weather events) are (often) due to large-scale/global climatic changes. Hence, cloud seeding just describes a local, short-term mitigation of these events. However, there is a geoengineering proposal (so climate modification) which also suggests to seed clouds above the sea (i.e. increase cloud coverage, e.g. by using seaspray as cloud condesation nuclei), thereby increasing the planetary albedo (Earth reflectance) and reducing the energy reaching the Earth surface. If this idea is promising or not, I couldn't judge upon, but for sure it is worthwhile to take a closer look at.
Ma Ru

Peter Florjancic: Slovenian inventor extraordinaire - 3 views

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    We're all here about inventiveness and creativity, so here you go... Story of a guy who's life's motto has been "Gold lies on the streets and you just need to dig it up with ideas. Ideas are like the shovel" Add to it Monte Carlo, Marlene Dietrich and, say, King Farouk and you get quite an amazing story... And most of all, after reading this you'll know the value of knowing how to ski.
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    nice story indeed ...
santecarloni

[1107.0392] Emergence of good conduct, scaling and Zipf laws in human behavioral sequen... - 3 views

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    ... proof that humanity is good?
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    "The dataset contains practically all actions of all players of the MMOG Pardus since the game went online in 2004 [18]. Pardus is an open-ended online game with a world- wide player base of currently more than 370,000 people. Play- ers live in a virtual, futuristic universe in which they interact with others in a multitude of ways to achieve their self-posed goals [22]. Most players engage in various economic activities typically with the (self-posed) goal to accumulate wealth and status. Social and economical decisions of players are often strongly influenced and driven by social factors such as friend- ship, cooperation, and conflict." quite impressive ...
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