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ESA ACT

Technology Review: TR10: Intelligent Software Assistant - 0 views

www.technologyreview.com/...22117

inf

shared by ESA ACT on 24 Apr 09 - Cached
  • ESA ACT on 24 Apr 09
     
    For consideration by the Information Management group...
ESA ACT

Technology Review: A Better Network for Outer Space - 0 views

www.technologyreview.com/...21601

internet space network INF

shared by ESA ACT on 24 Apr 09 - Cached
  • ESA ACT on 24 Apr 09
     
    I like the far-thinking approach...
ESA ACT

Technology Review: Laser Lunar Landing System - 0 views

www.technologyreview.com/...21660

lander optics sensors

shared by ESA ACT on 24 Apr 09 - Cached
  • ESA ACT on 24 Apr 09
     
    NASA still on active sensors...
ESA ACT

Technology Review: Europe Backs Supergrids - 0 views

www.technologyreview.com/...21742

europe NRG supergrid power network

shared by ESA ACT on 24 Apr 09 - Cached
  • ESA ACT on 24 Apr 09
     
    Additional infor for Niks project
ESA ACT

Technology Review: Compound-Eye Camera Analyzes Scenes - 0 views

www.technologyreview.com/...18772

BIO VisualAutopilot

shared by ESA ACT on 24 Apr 09 - Cached
  • ESA ACT on 24 Apr 09
     
    Another bio-inspired compound eye.
ESA ACT

The Space Review: Space tourism and carbon dioxide emissions - 0 views

www.thespacereview.com/...1

SpaceTourism Sustainability CO2

shared by ESA ACT on 24 Apr 09 - Cached
  • ESA ACT on 24 Apr 09
     
    Sensible and balanced article
Ma Ru

Dark Matter or Black Hole Propulsion? - 1 views

www.newscientist.com/...s-for-interstellar-travel.html

NRG propulsion star travel space PHY

shared by Ma Ru on 25 Nov 09 - Cached
  • Ma Ru on 25 Nov 09
     
    Anyone out there still doing propulsion stuff? Two more papers just waiting to get busted... http://arxiv.org/abs/0908.1429v1 http://arxiv.org/abs/0908.1803
  • ...5 more comments...
  • Luzi Bergamin on 26 Nov 09
     
    What an awful bunch of complete nonsense!!! But I don't think anybody wants to hear MY opinion on this...
  • pacome delva on 26 Nov 09
     
    wow, is this serious at all...!?
  • Luzi Bergamin on 26 Nov 09
     
    Are you joking?? The BH drive propses a BH with a lifetime of about an year, just 10^7 tons, peanuts!! Then you have to produce it, better not on Earth, so you do this in space, with a laser that produces an equivalent of 10^9 tons highly foucussed, even more peanuts!! Reasonable losses in the production process (probably 99,999%) are not yet taken into account. Engineering problems... :-) The DM drive is even better, they want to collect DM and compress it in a propulsion chamber. Very easy to collect and compress a gas of particles that traverse the Earth without any interaction. Perhaps if the walls of the chamber are made of artificial BHs?? Who knows??
  • LeopoldS on 26 Nov 09
     
    WRONG!!! we are all just WAITING for your opinion on this ....!!!
  • pacome delva on 27 Nov 09
     
    well, yes my remark was ironic... I'm surprised they did a magazine on these concepts...! But the press is always waiting for sensational. They do not even wait for the work to be peer-reviewed now to make an article on it ! This is one of the bad sides of arxiv in my opinion. It's like a journalist that make an article with a copy-paste in wikipedia ! Anyway, this is of course complete bullsh..., and I would have laughed if I had read this in a sci-fi book... but in a "serious" article i'm crying... For the DM i do not agree with your remark Luzi. It's not dark energy they want to use. The DM is baryonic, it's dark just because it's cold so we don't see it by usual means. If you believe the in the standard model of cosmology, then the DM should be somewhere around the galaxies. But it's of course not uniformly distributed, so a DM engine would work (if at all...) only in the periphery of galaxies. It's already impossible to get there...
  • Luzi Bergamin on 27 Nov 09
     
    One reply to Pacome, though the discussion exceeds by far the relevance of the topic already. Baryonic DM is strictly limited by cosomology, if one believes in these models, of course. Anyway, even though most DM is cold, we are constantly bombarded by some DM particles that come together with cosmic radiation, solar wind etc. etc. If DM easily interacted with normal matter, we would have found it long ago. In the paper they consider DM as neutralinos, which are neither baryonic nor strongly or electromagnetically interacting.
  • pacome delva on 27 Nov 09
     
    well then I agree, how the fu.. they want to collect them !!!
Luís F. Simões

Pioneer Anomaly Solved By 1970s Computer Graphics Technique - Technology Review - 4 views

www.technologyreview.com/...26589

pioneer anomaly PHY astrophysics

shared by Luís F. Simões on 31 Mar 11 - No Cached
Nicholas Lan liked it
  • Now Frederico Francisco at the Instituto de Plasmas e Fusao Nuclear in Lisbon Portugal, and a few pals, say they've worked out where the thermal calculations went wrong. These guys have redone the calculations using a computer model of not only how the heat is emitted but how it is reflected off the various parts of the spacecraft too. The reflections turn out to be crucial.
  • Ref: arxiv.org/abs/1103.5222: Modelling The Reflective Thermal Contribution To The Acceleration Of The Pioneer Spacecraft
  • santecarloni on 01 Apr 11
     
    This is really cool. I know one of the authors and he is a good guy... the only thing that leaves me unsatisfied is that if the whole issue is related to thermal effects one should have seen the Pioneer effect all the time and not only at about 10 AU... ...or is there some thermal process that kicked in only at this distance?
  • Luís F. Simões on 26 Jul 11
     
    Here's an update on this theory: NASA Releases New Pioneer Anomaly Analysis "The mysterious force acting on the Pioneer spacecraft seems to be falling exponentially. That's a strong clue that on-board heat is to blame, says NASA." Heat emission 'most likely cause' of pioneer anomaly "What's more interesting is that, contrary to the original analysis conducted all those years ago, the deceleration does seem to be decelerating at an exponential rate -- just as one might expect from the radioactive decay of plutonium-238, which powers the two spacecraft. Turyshev concludes, "The most likely cause of the Pioneer anomaly is the anisotropic emission of on-board heat.""
pacome delva

Physics - Free falling - 2 views

physics.aps.org/...PhysRevA.83.031804

phy atoms

shared by pacome delva on 29 Mar 11 - No Cached
  • In a Rapid Communication appearing in Physical Review A, Pengfei Zhang and colleagues at Shanxi University, China, describe experiments where they tracked an atom’s path with a spatial resolution of 100 nanometers and in a measurement time of 10 microseconds.
Luís F. Simões

Following SpaceX down the rabbit hole -- The Space Review - 4 views

www.thespacereview.com/...1

SpaceX launcher

shared by Luís F. Simões on 19 Apr 11 - No Cached
  • He then went on to remind the press that his company’s goal is to continue to lower the cost of access to space because high launch costs were “the fundamental factor preventing humanity from becoming a spacefaring civilization.”
  • First, two Falcon Heavy launches could field a return to the Moon
  • Second, a single Falcon Heavy could launch a Mars sample return mission.
  • ...3 more annotations...
  • Also possible with a single launch: a first ever human mission to an asteroid.
  • what effect Falcon Heavy might have on the costs of supporting the International Space Station. The ability to launch twice the supply capacity provided by the shuttle at something on the order of 20 percent of the cost changes the calculus entirely. So much so in fact, it opens the door for contemplating an entirely different future for ISS in which it never follows Mir into the Pacific.
  • Following conclusions offered by the Augustine Committee, the Obama Administration cancelled Project Constellation as unaffordable under existing budget limits, and supported instead the ambling, but cost-contained “flexible path.” If the Falcon Heavy is available, however, the rationale for selecting the flexible path—because it’s the only thing we can afford—simply doesn’t exist.
  • Luís F. Simões on 19 Apr 11
     
    an analysis of implications of the Falcon Heavy announcement
pacome delva

Physics - Fruit flies swim through air - 1 views

physics.aps.org/...PhysRevLett.106.178103

bio insect_wings flies

shared by pacome delva on 27 Apr 11 - No Cached
LeopoldS liked it
  • A new experiment reported in Physical Review Letters shows that—contrary to popular wisdom—paddling can be as effective in air as it is in water. This could imply that insects evolved their flight capability from some earlier swimming trait.
  • Using high-speed video cameras to track wing motion, the team observed certain cases where the flies paddled their wings forward and backward. To confirm that this was indeed drag-based motion, the team plugged their wing data into an “insect flight simulator” and found that they could reproduce the fly’s overall movement. The authors constructed a simple model of paddling, which seems to support the theory that insect wings evolved in water.
santecarloni

Giant Waterworld Confirmed Around Naked Eye Star  - Technology Review - 1 views

www.technologyreview.com/...27285

exoplanets science

shared by santecarloni on 26 Oct 11 - No Cached
  • santecarloni on 26 Oct 11
     
    The innermost planet around 55 Cancri A is almost certainly an exotic waterworld with a radius about twice Earth's, say astronomers
Thijs Versloot

Rise of the Robots #Economist - 2 views

www.economist.com/...le-want-technology-makes-their

robot economist

shared by Thijs Versloot on 28 Mar 14 - No Cached
  • Thijs Versloot on 28 Mar 14
     
    The Economist this week has a 14-page special on the rise of the robots. Don't expect a very indepth technical review but an interesting read nonetheless for some maybe.
  • Ma Ru on 28 Mar 14
     
    This article nailed the issue, as far as I'm concerned. By the way the diagram in the Economist is hilarious.. amazing combination of American and male chauvinism!
LeopoldS

Microsoft's Strange Quest for the Topological Qubit | MIT Technology Review - 2 views

www.technologyreview.com/...microsofts-quantum-mechanics

quantum computing

shared by LeopoldS on 13 Oct 14 - No Cached
  • LeopoldS on 13 Oct 14
     
    loads of nice passwords - should we have a closer look at it? anybody volunteering? e.g. Anna and Daniel?
  • jcunha on 16 Oct 14
     
    Just to add to this possible discussion, two important breakthroughs in Quantum Computing using Silicon were published last week (October 12th). Check it here: http://phys.org/news/2014-10-physicists-silicon-quantum.html
Thijs Versloot

Light bending material facilitates the search for new particles - 0 views

www.nanowerk.com/...newsid=37760.php

physics cherenkov high energy metamaterials

shared by Thijs Versloot on 17 Oct 14 - No Cached
  • Thijs Versloot on 17 Oct 14
     
    The problem is that the light cone angle has a limit - all particles with high momentum (mass x velocity) generate light cones with the same angle. Hence, these particles are indistinguishable. Now Chalmers researcher Philippe Tassin and his colleagues at the Free University of Brussels have designed a material that manipulates the Cherenkov cone so that also particles with high momentum get a distinct light cone angle too. The work is on the cover of this week's issue of the journal Physical Review Letters ("Controlling Cherenkov Radiation with Transformation-Optical Metamaterials").
jcunha

Science magazine breakthrough of the year - 3 views

news.sciencemag.org/...0-scientific-achievements-2014

science technology review

shared by jcunha on 19 Dec 14 - No Cached
  • jcunha on 19 Dec 14
     
    A compilation of the highlights of the year, with Rosetta on the first page. There is a follow-up article about potential breakthroughs for 2015 based on ongoing research very interesting to see as well.
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