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Juxi Leitner

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 ....
Luís F. Simões

Crowdfund a Moon Monolith Mission? - Slashdot - 1 views

idle.slashdot.org/...wdfund-a-Moon-Monolith-Mission

2001 monolith moon crowdsourcing private-spaceflight sci-fi fun

shared by Luís F. Simões on 07 Jan 11 - No Cached
  • Jamie found a somewhat amusing little essay on putting together a crowd-sourced mission to put a monolith on the moon. The author estimates it would cost half a billion dollars, which is a sum he thinks could be raised.
  • Let's raise the stakes. I propose raising half a trillion dollars to develop a time machine and put a monolith in Olduvai Gorge three million years in the past to influence Astralopithecus Afarensis evolution. Our very existence might depend on it.
Dario Izzo

Google defends H.264 removal from Chrome, says WebM plug-ins coming to Safari and IE9 -... - 1 views

m.engadget.com/...article.do

open source free sofware

shared by Dario Izzo on 16 Jan 11 - No Cached
  • Dario Izzo on 16 Jan 11
     
    Free software or a marketing move?
  • Francesco Biscani on 16 Jan 11
     
    They have all the weight they need to pull this through. I'm dreaming of a day in which they will switch all Youtube videos to WebM, with all the Apple devices becoming useless to watch Internet video :) And Steve Jobs struggling to explain why, after wearing the mantle of open standards in the whole Flash vs HTML5 thing, he's now pushing H.264 against WebM... Anyway, in my view the less encumbered formats around the best for everyone's freedom.
Luís F. Simões

Polynomial Time Code For 3-SAT Released, P==NP - Slashdot - 0 views

science.slashdot.org/...me-Code-For-3-SAT-Released-PNP

INF computer science mathematics algorithm complexity P=NP?

shared by Luís F. Simões on 20 Jan 11 - No Cached
  • "Vladimir Romanov has released what he claims is a polynomial-time algorithm for solving 3-SAT. Because 3-SAT is NP-complete, this would imply that P==NP. While there's still good reason to be skeptical that this is, in fact, true, he's made source code available and appears decidedly more serious than most of the people attempting to prove that P==NP or P!=NP. Even though this is probably wrong, just based on the sheer number of prior failures, it seems more likely to lead to new discoveries than most. Note that there are already algorithms to solve 3-SAT, including one that runs in time (4/3)^n and succeeds with high probability. Incidentally, this wouldn't necessarily imply that encryption is worthless: it may still be too slow to be practical."
  • Luís F. Simões on 20 Jan 11
     
    here we go again...
  • Luís F. Simões on 28 Feb 11
     
    slashdot: "Russian computer scientist Vladimir Romanov has conceded that his previously published solution to the '3 SAT' problem of boolean algebra does not work."
LeopoldS

Three-Dimensional Invisibility Cloak at Optical Wavelengths - 4 views

www.sciencemag.org/...337.abstract

technology phy science nan

shared by LeopoldS on 16 May 11 - No Cached
  • LeopoldS on 16 May 11
     
    more transformation optics ... 
  • dejanpetkow on 17 May 11
     
    I still believe that it is worth to check the thermal, mechanical and chemical properties of the developed metamaterials. For hyperbolic re-entries the radiation is still the dominating heat load source and a dominating bandwith may be indentified. A resistive metamaterial should be placed on the nose cap of the entry body in order to reduce local radiation heat load.
Luís F. Simões

Bitcoin P2P Currency: The Most Dangerous Project We've Ever Seen - 10 views

launch.is/...dangerous-project-weve-ev.html

bitcoin p2p money disruptive

shared by Luís F. Simões on 16 May 11 - No Cached
LeopoldS liked it
  • After month of research and discovery, we’ve learned the following:1. Bitcoin is a technologically sound project.2. Bitcoin is unstoppable without end-user prosecution.3. Bitcoin is the most dangerous open-source project ever created.4. Bitcoin may be the most dangerous technological project since the internet itself.5. Bitcoin is a political statement by technotarians (technological libertarians).*6. Bitcoins will change the world unless governments ban them with harsh penalties.
  • The benefits of a currency like this:a) Your coins can’t be frozen (like a Paypal account can be)b) Your coins can’t be trackedc) Your coins can’t be taxedd) Transaction costs are extremely low (sorry credit card companies)
  • An individual with the name -- or perhaps handle -- of Satoshi Nakamoto first wrote about bitcoins in a paper called Bitcoin: A Peer-to-Peer Electronic Cash System.
  • ...1 more annotation...
  • * We made this term up to describe the “good people” of the internet who believe in the fundamental rights of individuals to be free, have free speech, fight hypocrisy and stand behind logic, technology and science over religion, political structure and tradition. These are the people who build and support things like Wikileaks, Anonymous, Linux and Wikipedia. They think that people can, and should, govern themselves. They are against external forms of control such as DRM, laws that are bought and sold by lobbyists, and religions like Scientology. They include splinter groups that enforce these ideals in the form of hacktivism, such as the takedown of the Sony Playstation Network after Sony tried to prosecute a hacker for unlocking its console.
  • Ma Ru on 17 May 11
     
    Sounds good!
  • ...9 more comments...
  • pacome delva on 18 May 11
     
    wow it's frigthening! it's the dream of every anarchist, every drug, arm, human dealer! the world made as a global fiscal paradise... the idea is clever however it will not replace real money because 1 - no one will build a fortune on bitcoin if a technological breakthrough can ruin them 2 - government never allowed parallel money to flourish on their territory, so it will be almost impossible to change bitcoin against euros or dollars
  • Nicholas Lan on 18 May 11
     
    interesting stuff anyone read cryptonomicon by neal stephenson? similar theme.
  • Luís F. Simões on 18 May 11
     
    :) yes. One of the comments on reddit was precisely drawing the parallels with Neal Stephenson's Snowcrash / Diamond Age / Cryptonomicon. Interesting stuff indeed. It has a lot of potential for misuse, but also opens up new possibilities. We've discussed recently how emerging technologies will drive social change. Whether it's the likes of NSA / CIA who will benefit the most from the Twitters, Facebooks and so on, by gaining greater power for control, or whether individuals are being empowered to at least an identical degree. We saw last year VISA / PayPal censoring WikiLeaks... Well, here's a way for any individual to support such an organization, in a fully anonymous and uncontrollable way...
  • tvinko on 18 May 11
     
    One of my colleagues has made a nice, short write-up about BitCoin: http://www.pds.ewi.tudelft.nl/~victor/bitcoin.html
  • LeopoldS on 18 May 11
     
    very nice analysis indeed - thanks Tamas for sharing it!
  • pacome delva on 20 May 11
     
    mmm I'm not an expert but it seemed to me that, even if these criticisms are true, there is one fundamental difference between the money you exchange on internet via your bank, and bitcoins. The first one is virtual money and the second one aims at being real, physical, money, even if digital, in the same way as banknotes, coins, or gold.
  • nikolas smyrlakis on 20 May 11
     
    An algorithm wanna-be central bank issuing untraceable tax free money between internet users? not more likely than the end of the world supposed to take place tomorrow, in my opinion. Algorithms don't usually assault women though !:P
  • LeopoldS on 21 May 11
     
    well, most money is anyway just virtual and only based on expectations and trust ... (see e.g. http://en.wikipedia.org/wiki/Money_supply) and thus if people trust that this "money" has some value in the sense that they can get something of value to them in exchange, then not much more is needed it seems to me ...
  • pacome delva on 23 May 11
     
    @Leopold: ok let's use the rigth words then. Bitcoin aim at being a currency ("physical objects generally accepted as a medium of exchange" from wikipedia), different than the "demand deposit". In the article proposed by Tamas he compares what cannot be compared (currencies, demand deposits and their mean of exchange). The interesting question is wether one can create a digital currency which is too difficult to counterfeit. As far as I know, there is no existing digital currency except this bitcoins (and maybe the currencies from games as second life and others, but which are of limited use in real world).
  • nikolas smyrlakis on 23 May 11
     
    well of course money is trust, and even more loans and credit and even more stock and bond markets. It all represents trust and expectations. However since the first banks 500 years ago and the first loans etc. etc., and as well the fact that bonds and currencies bring down whole countries (Greece lately), and are mainly controlled by large financial centres and (central) banks, banks have always been on the winning side no matter what and that isn't going to change easily. So if you are talking about these new currencies it would be a new era, not just a new currency. So should Greece convert its debt to bitcoins ;P ?
  • pacome delva on 23 May 11
     
    well, from 1936 to 1993 the central bank of france was owned by the state and was supposed to serve the general interest...
LeopoldS

Focus Fusion Society: Developing an environmentally safe, clean, low cost, unlimited e... - 0 views

focusfusion.org

nuclear NRG fusion fission plasma

shared by LeopoldS on 26 Oct 09 - Cached
  • LeopoldS on 26 Oct 09
     
    is this just another cold fusion crap or something we could have a closer look at .... still not clear to me ... anybody?
Joris _

DailyTech - NASA Releases iPhone App - 2 views

www.dailytech.com/...article16613.htm

shared by Joris _ on 26 Oct 09 - Cached
  • The U.S. space agency has worked more diligently the past few years to better interact with the public.
  • Joris _ on 26 Oct 09
     
    what about ESA?
  • ...3 more comments...
  • LeopoldS on 26 Oct 09
     
    have already sent it as a suggestion to our com department ... btw: installed the app and its really well done!!
  • Francesco Biscani on 27 Oct 09
     
    God no, why give more taxpayers' money to the shittiest, greediest and most closed company out there??
  • LeopoldS on 27 Oct 09
     
    why "more" ... do they get any taxpayers money? answer to your question: because its the most efficient (and coolest) platform to convey your message to a larger audience with relatively little effort ... btw: just ordered a time capsule for home :-)
  • Francesco Biscani on 27 Oct 09
     
    I said "more" because we already gave them money in the form of Sophia and Atlas :) If we want to be consistent in promoting "open" efforts (open innovation, open source, open governance, etc.) we should avoid Apple like the plague. They are far far worse than Microsoft in terms of closedness, secrecy, shady market practices and vendor lock-in. Just google a bit and you will find lots of example of their behaviour.
  • nikolas smyrlakis on 28 Oct 09
     
    cant' really argue about the Apple practices, although I ve read some things. I think the NASA app is more like a news feed and nothing more. But that online crowdsourcing game we had in mind, now that would be cool in a mobile version - new mobiles also have accelerometers nowadays
pacome delva

One-way Mirror for Sound Waves | Physical Review Focus - 0 views

focus.aps.org/st8

phy sound_wave

shared by pacome delva on 31 Aug 09 - Cached
  • If the technique is practical, it could give designers new flexibility in making ultrasonic sources like those used in medical imaging.
LeopoldS

Optics InfoBase - Highly directional radiation generated by a tungsten thermal source - 0 views

www.opticsinfobase.org/abstract.cfm

SPS NRG WPT

shared by LeopoldS on 13 Sep 09 - Cached
  • LeopoldS on 13 Sep 09
     
    as with my last post: how long could such distances get? ready for SPS?
ESA ACT

Posts tagged BugLabs at Engadget - 0 views

www.engadget.com/BugLabs

open-source INF innovation future gadget

shared by ESA ACT on 24 Apr 09 - Cached
  • ESA ACT on 24 Apr 09
     
    look at these bugs .... can't we do something with them? they look nice for sure ....
ESA ACT

SIMILE | Welkin - 0 views

simile.mit.edu/welkin

internet network open-source programming rdf SemanticWeb web2.0

shared by ESA ACT on 24 Apr 09 - Cached
  • ESA ACT on 24 Apr 09
     
    Luzi and Dario: can we use this semantic tool for the "temperature of ESA" project? please check
ESA ACT

Welcome - Bazaar Version Control - 0 views

bazaar-vcs.org

open-source programming software CollaborativeWork

shared by ESA ACT on 24 Apr 09 - Cached
  • ESA ACT on 24 Apr 09
     
    distributed version control system
LeopoldS

Main Page - FreeMind - free mind mapping software - 0 views

freemind.sourceforge.net/...Main_Page

open source brainstorming innovation

shared by LeopoldS on 24 Jun 09 - Cached
  • LeopoldS on 24 Jun 09
     
    anybody has experience with this already?
ESA ACT

Science News / An Attractive Source For Spintronics - 0 views

www.sciencenews.org/...ractive_source_for_spintronics

physics NRG

shared by ESA ACT on 24 Apr 09 - Cached
  • ESA ACT on 24 Apr 09
     
    anybody wants to look into this closer? maybe Pacôme? -LS
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