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jcunha

Researchers design metamaterial that buckles selectively - 4 views

phys.org/...5-06-metamaterial-buckles.html

PHY space FUN buckling 3D-print

shared by jcunha on 11 Jun 15 - No Cached
  • jcunha on 11 Jun 15
     
    New 3D printed macro structure exhibits selective buckling open the way for custom shape-memory materials found our neighbor scientists from the Lorentz Institut of the Leiden University. Wonder if it can be applied for self-assembled deployment of structures.
Dario Izzo

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 ...
Ma Ru

Tesla reveals robotic snake car charger - 2 views

www.bbc.co.uk/...technology-33794085

technology robotics tesla fun

shared by Ma Ru on 07 Aug 15 - No Cached
  • Ma Ru on 07 Aug 15
     
    Quoting Elon Musk, "it does seem kinda wrong"...
  • Thijs Versloot on 10 Aug 15
     
    Is it just me but isn't this just needlessly complicated? I mean, you can design the plug on the car, its horizontal and symmetric. Why not just translational motors. Probably because its boring and one wants to make a metal Dr. Octavius tentacle of course
  • Ma Ru on 14 Aug 15
     
    Precisely!
Nina Nadine Ridder

Quantum computer around the corner after Australian scientists make key breakthrough - 1 views

www.abc.net.au/...s4325962.htm

technology quantum_computing science

shared by Nina Nadine Ridder on 07 Oct 15 - No Cached
LeopoldS liked it
  • Nina Nadine Ridder on 07 Oct 15
     
    Australian scientists have cleared one of the final hurdles for designing and building a quantum computer. The team of engineers from the University of New South Wales has successfully built a core component needed for the computer to operate and the work is published today in the journal Nature.
pacome delva

Royal Society Fellows Question Body's Climate Change Statements - 1 views

news.sciencemag.org/...ociety-fellows-question-b.html

phy environment global_warming climate_change climato_sceptics

shared by pacome delva on 01 Jun 10 - Cached
  • The Royal Society has released a statement acknowledging that its climate guide is being updated and noting: "The new guide has been planned for some time but was given added impetus by concerns raised by a small group of Fellows of the Society that older documents designed to challenge some of the common misrepresentations of the science were too narrow in their focus."
  • pacome delva on 01 Jun 10
     
    The "climatosceptics" are more and more powerful, in France it's crazy how much they are in newspaper and television... Before it was fancy to fear the global warming, now it's fancy to fight the "dictat" of the Science, as if Science was a religion with its dogma !
Joris _

Ariane 6 Study Launched | AVIATION WEEK - 0 views

www.aviationweek.com/...story.jsp

technology rocket

shared by Joris _ on 12 Jul 10 - Cached
  • Among the concepts to be studied by the Astrium team are a two-stage configuration with a Vulcain II-type or expander cycle cryogenic main-stage engine, a two-stage design with a methane/oxygen main-stage engine; and a three-stage configuration with solid propulsion first- and second-stage motors.
  • Joris _ on 12 Jul 10
     
    doesn't look very ambitious with such choices!
pacome delva

Sensitivity training for LISA - 1 views

physics.aps.org/...PhysRevLett.104.211103

phy time_delay_interferometry LISA

shared by pacome delva on 08 Jun 10 - Cached
  • De Vine and colleagues therefore designed a laboratory scale version of LISA and showed they were able to suppress two potentially damaging noise sources: phase fluctuations in the clocks that synchronize the measurements and frequency fluctuations in the lasers.
  • pacome delva on 08 Jun 10
     
    good news for LISA...!
pacome delva

Physics - Small-scale hydraulics - 1 views

physics.aps.org/...PhysRevLett.103.144503

phy nan nanofluidic bio

shared by pacome delva on 07 Oct 09 - Cached
  • Taking a cue from biology, scientists are now designing nanofluidic devices in which molecular interactions at the walls of a narrow channel are engineered to control fluid flow.
Joris _

NASA Set to Launch Solar NanoSail into Space | Inhabitat - Green Design Will Save the W... - 0 views

inhabitat.com/...unch-solar-nanosail-into-space

shared by Joris _ on 20 Aug 10 - Cached
  • 100 square feet;
  • NASA is, rather, testing the deployment mechanism.
  • In 2008, engineers were given just four months to devise a solar sail. They pulled it off, but the rocket carrying the sail experienced launch failure.
  • ...1 more annotation...
  • to learn more about how best to bring older satellites out of space rather than allowing them to become that much more space junk
Joris _

Airbus Concept Has Weird Wings, Morphing Seats | Autopia | Wired.com - 6 views

www.wired.com/...airbus-concept-plane-2050

MAD technology concept

shared by Joris _ on 21 Jul 10 - Cached
LeopoldS liked it
  • it reflects what experts in aircraft materials, aerodynamics, cabin design and engines came up with after considering what air transport might look like in 2050
  • Seems safe to say there are some within Airbus who truly are allowed to imagine something beyond normal aircraft interiors.
  • Joris _ on 21 Jul 10
     
    what a ACT's exercise should look like...
  • ...1 more comment...
  • LeopoldS on 21 Jul 10
     
    honestly, if this is all they can imagine for 2050 then this is quite boring .... "Here we are stretching our imagination and thinking beyond our usual boundaries," they are probably not having enough of imagination yet ....
  • Joris _ on 21 Jul 10
     
    Maybe, you should propose this exercise to the team. You'll see there is not much imagination, unless, you consider imagination equals craziness (bullshit things ... and the too common blah blah in the act). I think this concept is an imaginative credible concept. "anything we might ever see" explains it well.
  • pacome delva on 21 Jul 10
     
    well, the article is not very detailed so it can be only "du vent" ! did they actually try if such an airplane can fly ??? what about the engine ??? i find the solar impulse (see post below) much more eco-friendly !!! I agree with Leopold that it's quite boring and stays in the mainstream of the production. I'm sure we can do much better !!! What about some really useful things like pills against the flight sickness, and some really good food in the plane ? haha not soon to happen with all the cost reduction. The future of air transport will be a plane without seats, stewards and perhaps even without pilot !!!
Juxi Leitner

Microsoft Shows Off 'Milo' Virtual Human | News & Opinion | PCMag.com - 0 views

www.pcmag.com/...0,2817,2366470,00.asp

virtual human microsoft fun science AI technology INF

shared by Juxi Leitner on 20 Jul 10 - Cached
  • TED, Microsoft showed off its "virtual human" technology, named Milo, designed for the company's hands-free Xbox 360 motion controller called Kinect at TED Global in Oxford. Milo is built to react to people's emotions, body movements, and voice, allowing players to interact with the virtual character.
Francesco Biscani

DM's Esoteric Programming Languages - Intelligent Design Sort - 1 views

www.dangermouse.net/...intelligentdesignsort.html

inf

shared by Francesco Biscani on 29 Jul 10 - Cached
  • Francesco Biscani on 29 Jul 10
     
    Cool algorithm! We should implement it in PaGMO.
Juxi Leitner

The Associated Press: Launch set for US satellite to monitor space junk - 0 views

www.google.com/..._b5weFCgVAaZ5ZzRsSUiQD9ID5T000

technology space situational awareness

shared by Juxi Leitner on 24 Sep 10 - No Cached
  • It's designed to give the Air Force its first full-time, space-based surveillance of satellites and debris in Earth's orbit. It monitors them for possible collisions.
nikolas smyrlakis

The Space Game - 3 views

games.slashdot.org/...h-Design-Your-Route-To-Jupiter

space game

shared by nikolas smyrlakis on 05 Oct 10 - No Cached
  • nikolas smyrlakis on 05 Oct 10
     
    already on slashdot with a lot of comments. Amazing work, I have no words ! I will just start playing
  • nikolas smyrlakis on 05 Oct 10
     
    best comment, act style : If we assume teleporters, it wouldn't even take a second. Therefore my completely unrealistic solution is much better than your completely unrealistic
Luís F. Simões

NASA Goddard to Auction off Patents for Automated Software Code Generation - 0 views

www.spaceref.com/...viewpr.html

nasa patents software fault-tolerance design swarm

shared by Luís F. Simões on 04 Nov 10 - No Cached
  • The technology was originally developed to handle coding of control code for spacecraft swarms, but it is broadly applicable to any commercial application where rule-based systems development is used.
  • Luís F. Simões on 04 Nov 10
     
    This is related to the "Verified Software" item in NewScientist's list of ideas that will change science. At the link below you'll find the text of the patents being auctioned: http://icapoceantomo.com/item-for-sale/exclusive-license-related-improved-methodology-formally-developing-control-systems :) Patent #7,627,538 ("Swarm autonomic agents with self-destruct capability") makes for quite an interesting read: "This invention relates generally to artificial intelligence and, more particularly, to architecture for collective interactions between autonomous entities." "In some embodiments, an evolvable synthetic neural system is operably coupled to one or more evolvable synthetic neural systems in a hierarchy." "In yet another aspect, an autonomous nanotechnology swarm may comprise a plurality of workers composed of self-similar autonomic components that are arranged to perform individual tasks in furtherance of a desired objective." "In still yet another aspect, a process to construct an environment to satisfy increasingly demanding external requirements may include instantiating an embryonic evolvable neural interface and evolving the embryonic evolvable neural interface towards complex complete connectivity." "In some embodiments, NBF 500 also includes genetic algorithms (GA) 504 at each interface between autonomic components. The GAs 504 may modify the intra-ENI 202 to satisfy requirements of the SALs 502 during learning, task execution or impairment of other subsystems."
LeopoldS

Violation of local realism with freedom of choice - PNAS - 4 views

www.pnas.org/...1002780107

science PHY space

shared by LeopoldS on 01 Nov 10 - No Cached
  • LeopoldS on 01 Nov 10
     
    another Zeilinger experiment ...
  • Luzi Bergamin on 02 Nov 10
     
    And what if the freedom-of-choice is corrupted due to yet another hidden variable in past lightcone of the whole experiment that triggers Alice and Bob's choice as well as the pair creation? Then we can design yet another experiment that will have yet another loophole. I guess this is experimentally interesting work, but the introduction rather reads like an article from the "Institut für Grenzgebiete der Psychologie und Psychohygiene"...
Joris _

KodiakDailyMirror.com :: Daily newspaper of Kodiak, Alaska - 0 views

www.kodiakdailymirror.com/?pid=19&id=9333

MAD Solar Sail

shared by Joris _ on 18 Nov 10 - No Cached
  • The NanoSailD is a solar sail designed to use light particles to accelerate. If all goes well it will be the first solar sail deployed by NASA.
  • It instead uses the sail for the humble but important mission of testing a potential orbit-cleaning tool.
Luís F. Simões

heat shields: NASA's Orion capsule vs. SpaceX's Dragon capsule - 0 views

neil.fraser.name/09

re-entry shielding design optimization spacex nasa

shared by Luís F. Simões on 11 Dec 10 - No Cached
  • NASA has 50 years of experience with reentry capsules, but is fearful of trying something new. SpaceX has no reentry experience and chooses the most efficient engineering approach. Guess whose capsule is overweight and still sitting on the ground? Guess whose capsule completed a successful first flight yesterday?
  • Dario Izzo on 12 Dec 10
     
    Powerful contrast between the two pictures!!
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