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New DARPA challenge wants unique algorithms for space applications - 4 views

www.networkworld.com/...79962 technology control MAD
shared by Joris _ on 07 Mar 12 - No Cached
  • Joris _ on 07 Mar 12
     
    "On March 28, the Defense Advanced Research Projects Agency will kick of another one of its highly successful challenges this time looking for teams or individuals to develop unique algorithms to control small satellites on-board the International Space Station. " Will the ACT participate?
  • Ma Ru on 08 Mar 12
     
    That would be wrong on so many levels...
  • LeopoldS on 09 Mar 12
     
    Could not find out what the prize money is? Also does not seem clear to me how three cubes can catch an object "flying" in the opposite direction... But the approach is nice to see
2More

A Swarm of Nano Quadrotors - YouTube - 3 views

www.youtube.com/watch FUN MAD
shared by jmlloren on 01 Feb 12 - No Cached
LeopoldS liked it
  • jmlloren on 01 Feb 12
     
    Nice formation flying, though I still prefer Dario's 3D animation
  • LeopoldS on 01 Feb 12
     
    very nice indeed!!
1More

DARPA Aims to Repurpose Retired Satellites - 2 views

informationweek.com/...232301269 technology MAD Space Darpa
shared by Joris _ on 05 Jan 12 - No Cached
  • Joris _ on 05 Jan 12
     
    Agency wants to send mini robots into space to recycle and reuse antennas from more than 1,300 dormant satellites in geostationary orbit above the earth.
2More

Domino's plans pizza on the Moon - Telegraph - 0 views

www.telegraph.co.uk/...s-plans-pizza-on-the-Moon.html MAD
shared by Joris _ on 02 Sep 11 - No Cached
  • Rival chain Pizza Hut set the bar high in 2001 by delivering a pizza to astronauts orbiting the Earth
  • a plan for a dome-shaped concrete Domino's restaurant on the surface of the moon.
2More

Designer lattices - 5 views

physics.aps.org/...PhysRevLett.107.085501 MAD NAN
shared by jmlloren on 17 Aug 11 - No Cached
  • jmlloren on 17 Aug 11
     
    Perhaps interesting for the SPS self-assembling
  • LeopoldS on 19 Aug 11
     
    nice, read only the abstract so far but looks to me like a bit of 19th century crystallography reinvented ...
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Asteroid Deflection Research Center - 5 views

www.youtube.com/watch space MAD NEO
shared by Joris _ on 16 Jul 11 - No Cached
  • Joris _ on 16 Jul 11
     
    lol
16More

Optimal Control Probem in the CR3BP solved!!! - 7 views

math.u-bourgogne.fr/...research OCP CR3BP trajectory MAD
shared by Dario Izzo on 07 Jun 11 - No Cached
  • Dario Izzo on 07 Jun 11
     
    This guy solved a problem many people are trying to solve!!! The optimal control problem for the three body problem (restricted, circular) can be solved using continuation of the secondary gravity parameter and some clever adaptation of the boundary conditions!! His presentation was an eye opener ... making the work of many pretty useless now :)
  • ...13 more comments...
  • Ma Ru on 08 Jun 11
     
    Riemann hypothesis should be next... Which paper on the linked website is this exactly?
  • Joris _ on 08 Jun 11
     
    hmmm, last year at the AIAA conference in Toronto I presented a continuation approach to design a DRO (three-body problem). Nothing new here unfortunately. I know the work of Caillau, although interesting what is presented was solved 10 years ago by others. The interest of his work is not in the applications (CR3BP), but in the research of particular regularity conditions that unfortunately make the problem limited practically. Look also at the work of Mingotti, Russel, Topputo and other for the (C)RTBP. Smart-One inspired a bunch of researchers :)
  • Dario Izzo on 08 Jun 11
     
    Topputo and some of the others 'inspired' researchers you mention are actually here at the conference and they are all quite depressed :) Caillau really solves the problem: as a one single phase transfer, no tricks, no misconvergence, in general and using none of the usual cheats. What was produced so far by other were only local solutions valid for the particular case considered. In any case I will give him your paper, so that he knows he is working on already solved stuff :)
  • Dario Izzo on 08 Jun 11
     
    Answer to Marek: the paper you may look at is: Discrete and differential homotopy in circular restricted three-body control
  • Joris _ on 08 Jun 11
     
    Ah! with one single phase and a first order method then it is amazing (but it is still just the very particular CRTBP case). The trick is however the homotopy map he selected! Why this one? Any conjugate point? Did I misunderstood the title ? I solved in one phase with second order methods for the less restrictive problem RTBP or simply 3-body... but as a strict answer to your title the problem has been solved before. Nota: In "Russell, R. P., "Primer Vector Theory Applied to Global Low-Thrust Trade Studies," JGCD, Vol. 30, No. 2", he does solve the RTBP with a first order method in one phase.
  • Joris _ on 08 Jun 11
     
    I think what is interesting is not what he solved, but how he solved the problem. But, are means more important than end ... I dunno
  • Dario Izzo on 08 Jun 11
     
    I also loved his method, and it looked to me that is far more general than the CRTBP. As for the title of this post, OK maybe it is an exageration as it suggests that no solution was ever given before, on the other end, as Marek would say "come on guys!!!!!"
  • Joris _ on 09 Jun 11
     
    The generality has to be checked. Don't you think his choice of mapping is too specific? he doesn't really demonstrate it works better than other. In addition, the minimum time choice make the problem very regular (i guess you've experienced that solving min time is much easier than mass max, optimality-wise). There is still a long way before maximum mass+RTBP, Topputo et al should be re-assured :p Did you give him my paper, he may find it interesting since I mention the homotopy on mu but for max mass:)
  • Dario Izzo on 09 Jun 11
     
    Joris, that is the point I was excited abut, at the conference HE DID present solutions to the maximum mass problem!! One phase, from LEO to an orbit around the moon .. amazing :) You will find his presentation on line.... (according to the organizers) I gave him the reference to you paper anyway, but no pdf though as you did not upload it on our web pages and I could not find it in the web. So I gave him some bibliography I had with be from the russians, and from Russell, Petropoulos and Howell, As far as I know these are the only ones that can hope to compete with this guy!!
  • Joris _ on 09 Jun 11
     
    for info only, my phd, in one phase: http://pdf.aiaa.org/preview/CDReadyMAST08_1856/PV2008_7363.pdf I prefered Mars than the dead rock Moon though!
  • Dario Izzo on 09 Jun 11
     
    If you send me the pdf I can give it to the guy .. the link you gave contains only the first page ... (I have no access till monday to the AIAA thingy)
  • LeopoldS on 11 Jun 11
     
    this is why I like this Diigo thingy so much more than delicious ...
  • tvinko on 17 Jun 11
     
    What do you mean by this comment, Leopold? ;-) Jokes apart: I am following the Diigo thingy with Google Reader (rss). Obviously, I am getting the new postings. But if someone later on adds a comment to a post, then I can miss it, because the rss doesn't get updated. Not that it's a big problem, but do you guys have a better solution for this? How are you following these comments? (I know that if you have commented an entry, then you get the later updates in email.) (For example, in google reader I can see only the first 5 comments in this entry.)
  • LeopoldS on 18 Jun 11
     
    I like when there are discussions evolving around entries
  • LeopoldS on 18 Jun 11
     
    and on your problem with the RSS Tamas: its the same for me, you get the comments only for entries that you have posted or that you have commented on ...
1More

DARPA Solicits Ideas For Its Hundred-Year Starship Project | Popular Science - 4 views

www.popsci.com/...try-100-year-starship-concepts darpa MAD
shared by Joris _ on 05 May 11 - No Cached
  • LeopoldS on 05 May 11
     
    I just can't see how their way of finding non-state funding for a 100 year project could work but would be happy to be surprised positively ...
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NASA Considering Gas Stations in Space - FoxNews.com - 3 views

www.foxnews.com/...-nasa-plans-gas-stations-space nasa MAD space NRG
shared by Joris _ on 04 May 11 - No Cached
  • LeopoldS on 05 May 11
     
    Chris Moore is a good guy and one very open minded to new ideas and concepts at NASA; the fact that this was picked up by fox news must be that they could relay this to "gas stations" :-)
2More

Orbiting Dust Storm Could Remove Space Junk - 6 views

www.technologyreview.com/...26634 MAD Space Debris
shared by Joris _ on 13 Apr 11 - No Cached
LeopoldS liked it
  • Joris _ on 13 Apr 11
     
    A good example of how loosing perspective makes so-called "novel ways" actually "rubish ways"
  • LeopoldS on 15 Apr 11
     
    here the paper: http://arxiv.org/abs/1104.1401 well spent defence funding ....
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Water-Powered Spaceship Could Make Spaceflight Cheaper | Space Travel and Exploration |... - 1 views

www.space.com/aceship-mars-solar-system.html mad water technology space NRG
shared by Joris _ on 28 Mar 11 - No Cached
  • Joris _ on 28 Mar 11
     
    what to think about that? spoiling important ressources, smart idea?, and is it really cheap?
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Presentations from Target NEO Workshop (22 February 2011): Providing a Resilient NEO Ac... - 1 views

planetarydefense.blogspot.com/...ons-from-recent-targetneo.html MAD NEO
shared by Joris _ on 11 Mar 11 - No Cached
  • Joris _ on 11 Mar 11
     
    Recents talks about NEO and human explorations. Some very interesting things.
1More

RAGE game by id Software (takes place after Apophis Impact) - 3 views

planetarydefense.blogspot.com/...y-id-software-takes-place.html MAD NEO asteroids game
shared by Joris _ on 02 Mar 11 - No Cached
  • Joris _ on 02 Mar 11
     
    I don't put too many geeky stuffs here, but that may be a game to have a look at :) not that "The Space Game" wasn't "fun".
1More

Beam Me Up: Could Lasers Launch Rockets? - 1 views

news.discovery.com/...aser-launch-rocket-110215.html rocket technology MAD NRG fuel
shared by Joris _ on 16 Feb 11 - No Cached
  • Joris _ on 16 Feb 11
     
    another hill to climb (in reference to a metaphor of a recent post)
7More

What the strange persistence of rockets can teach us about innovation. - 5 views

www.slate.com/...all technology innovation space politic MAD
shared by Joris _ on 04 Feb 11 - No Cached
  • Joris _ on 04 Feb 11
     
    If I could write, this is exactly what I would write about rocket, GO, and so on... :) "we are decadent and tired. But none of the bright young up-and-coming economies seem to be interested in anything besides aping what the United States and the USSR did years ago. We may, in other words, need to look beyond strictly U.S.-centric explanations for such failures of imagination and initiative. ... Those are places we need to go if we are not to end up as the Ottoman Empire of the 21st century, and yet in spite of all of the lip service that is paid to innovation in such areas, it frequently seems as though we are trapped in a collective stasis." "But those who do concern themselves with the formal regulation of "technology" might wish to worry less about possible negative effects of innovation and more about the damage being done to our environment and our prosperity by the mid-20th-century technologies that no sane and responsible person would propose today, but in which we remain trapped by mysterious and ineffable forces."
  • ...4 more comments...
  • Ma Ru on 04 Feb 11
     
    Very interesting, though I'm amused how the author tends to (subconsciously?) shift the blame to non-US dictators :-) Suggestion that in absence of cold war US might have abandoned HB and ICBM programmes is ridiculous.
  • Luís F. Simões on 04 Feb 11
     
    Interesting, this was written by Neal Stephenson ( http://en.wikipedia.org/wiki/Neal_Stephenson#Works ). Great article indeed. The videos of the event from which this arose might be equally interesting: Here Be Dragons: Governing a Technologically Uncertain Future http://newamerica.net/events/2011/here_be_dragons "To employ a commonly used metaphor, our current proficiency in rocket-building is the result of a hill-climbing approach; we started at one place on the technological landscape-which must be considered a random pick, given that it was chosen for dubious reasons by a maniac-and climbed the hill from there, looking for small steps that could be taken to increase the size and efficiency of the device."
  • Joris _ on 04 Feb 11
     
    You know Luis, when I read this quote, I could help thinking about GO, which would be kind of ironic considering the context but not far from what happens in the field :p
  • LeopoldS on 05 Feb 11
     
    Fantastic!!!
  • LeopoldS on 05 Feb 11
     
    Would have been nice if it were historically more accurate and less polemic / superficial
  • pacome delva on 14 Feb 11
     
    mmmh... the wheel is also an old invention... there is an idea behind but this article is not very deepfull, and I really don't think the problem is with innovation and lack of creative young people !!! look at what is done in the financial sector...
3More

Proposed mission to Jupiter system achieves milestone - 1 views

www.sciencedaily.com/...110204205538.htm life MAD
shared by Dario Izzo on 11 Feb 11 - No Cached
  • Dario Izzo on 11 Feb 11
     
    Understanding life is the scientific focus of the next Europa/Ganimede mission!
  • LeopoldS on 12 Feb 11
     
    the objective is rather the study of "emergence of habitable worlds", which of course includes understanding of life and what habitability is ...
  • LeopoldS on 12 Feb 11
2More

Nautilus X MMSEV Is More Outside-the-Box Space Thinking from NASA - 1 views

news.yahoo.com/...dl9pc19tb3JlX291dHNpZGV0aGVib3 technology MAD
shared by Joris _ on 31 Jan 11 - No Cached
  • Joris _ on 31 Jan 11
     
    Wonder what is the most creative: the system or the name! NAUTILUS-X = Non-Atmospheric Universal Transport Intended for Lengthy United States X-ploration http://spirit.as.utexas.edu/~fiso/telecon/Holderman-Henderson_1-26-11/Holderman_1-26-11.ppt
  • LeopoldS on 03 Feb 11
     
    dreaming ...
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