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ESA ACT

MRS Issue on Negative-Index Materials - 0 views

www.mrs.org/...sec_subscribe.asp

technology PHY NAN science

shared by ESA ACT on 24 Apr 09 - No Cached
  • ESA ACT on 24 Apr 09
     
    How light travels through a material is measured by the index of refraction, a fundamental optical constant long thought to be an intrinsic materials property. However, research has shown that features manipulated through nanofabrication techniques can le
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 !!!
Joris _

A Fusion Thruster for Space Travel - IEEE Spectrum - 4 views

spectrum.ieee.org/...0

Thruster PHY NRG NASA

shared by Joris _ on 29 Jun 11 - No Cached
LeopoldS liked it
  • Now a NASA engineer has come up with a new way to fling satellites through space on mere grams of fuel, tens of times as efficiently as today’s best space probe thrusters.
  • Instead of using deuterium and tritium as the fuel stocks, the new motor extracts energy from boron fuel.
  • Joris _ on 29 Jun 11
     
    "And according to his calculations, improvements in short-pulse laser systems could make this form of thruster more than 40 times as efficient as even the best of today's ionic propulsion systems that push spacecraft around. "
  • LeopoldS on 02 Jul 11
     
    Dejan please have a look at this also ...
  • LeopoldS on 02 Jul 11
     
    while the nuclear reaction seems to be sound at first view, I am not so sure how this would work: "Electromagnetic forces push the target and the alpha particles in the opposite directions, and the particles exit the spacecraft through a nozzle, providing the vehicle's thrust. "
Marcus Maertens

How leaves talk to roots - 1 views

phys.org/2018-09-roots.html

BIO science

shared by Marcus Maertens on 27 Sep 18 - No Cached
icheibas and tricepaige liked it
  • Marcus Maertens on 27 Sep 18
     
    Micro RNA produced in the leaves is able to travel to the roots to regulate symbiosis with some friendly bacteria.
LeopoldS

Scientists test novel power system for space travel (w/ video) - 1 views

phys.org/...entists-power-space-video.html

Nuclear NPS reactor

shared by LeopoldS on 28 Nov 12 - No Cached
  • LeopoldS on 28 Nov 12
     
    Less impressive than the headline, since they actually just tested their conversion system at suboptimal conditions on an existing reactor setup, but still since done within six month and with less than 1M€ ...
tvinko

Travelling Salesman movie - 4 views

www.travellingsalesmanmovie.com

INF optimisation algorithm

shared by tvinko on 13 Mar 13 - No Cached
Dario Izzo liked it
  • tvinko on 13 Mar 13
     
    related conspiracy: politicians know that P=NP but they do not let us know the proof
  • Dario Izzo on 17 Mar 13
     
    did you put money on this? I would love to see it :)
Guido de Croon

Bumblebees tackling the travelling salesman problem - 2 views

www.plosbiology.org/...10.1371%2Fjournal.pbio.1001392

bio science

shared by Guido de Croon on 01 Oct 12 - No Cached
  • Guido de Croon on 01 Oct 12
     
    Nice article on how bumblebees optimize their path from flower to flower.
Alexander Wittig

Visa Restriction Index 2006 to 2016 - 3 views

visaindex.com

politics

shared by Alexander Wittig on 01 Mar 16 - No Cached
  • Alexander Wittig on 01 Mar 16
     
    For 11 years, Henley & Partners has published the Visa Restrictions Index, giving unprecedented and inimitable insight into the development of visa policies over time. It is the only Index produced in collaboration with the International Air Transport Association, which maintains the world's largest database of travel information.
Vincent C

Fly into Solar Radiation Storm (First ACT member into space !) - 1 views

science.nasa.gov/...19apr_camilla

Solar radiation storm nasa

shared by Vincent C on 25 Apr 12 - No Cached
LeopoldS and pandomilla liked it
  • Vincent C on 25 Apr 12
     
    " This isn't Camilla's first adventure. The chicken has also flown on a NASA T-38 training jet, traveled onboard a helium balloon to the stratosphere over Louisiana, visited the Yuri Gagarin Cosmonaut Training Center in Star City, Russia, and visited hundreds of elementary students in classrooms around the country. " Pretty impressive Camilla ! Congratulations :)
Lionel Jacques

Prolonged Space Travel Causes Brain and Eye Abnormalities in Astronauts | SpaceRef - Yo... - 1 views

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

Bio space Science

shared by Lionel Jacques on 15 Mar 12 - No Cached
  • Lionel Jacques on 15 Mar 12
     
    "Magnetic resonance imaging (MRI) of the eyes and brains of 27 astronauts who have spent prolonged periods of time in space revealed optical abnormalities similar to those that can occur in intracranial hypertension of unknown cause, a potentially serious condition in which pressure builds within the skull."
Ma Ru

1st Symposium on Plant Signalling and Behaviour 2012 - 0 views

spsb2012.com

bio plants cognition science symposium conference cfp

shared by Ma Ru on 16 Mar 12 - No Cached
  • Ma Ru on 16 Mar 12
     
    Something for the plant folks... assuming you have enough travel budget...
  • pandomilla on 17 Mar 12
     
    It is a nice conference indeed, I've been to many of the previous editions (they changed the name of the conference this year)...
santecarloni

Occupy Federal Science: "Transformative" Research Can't Come From Milquetoast | The Cru... - 4 views

blogs.discovermagazine.com/...rch-cant-come-from-milquetoast

science research

shared by santecarloni on 14 Dec 11 - No Cached
LeopoldS liked it
  • LeopoldS on 15 Dec 11
     
    I like this one "The kind of idle pastime that might amuse physicists is to imagine drafting Einstein's grant applications in 1905. "I propose to investigate the idea that light travels in little bits," one might say. "I will explore the possibility that time slows down as things speed up," goes another. Imagine what comments these would have elicited from reviewers for the German Science Funding Agency, had such a thing existed. Instead, Einstein just did the work anyway while drawing his wages as a technical expert third-class at the Bern patent office. And that is how he invented quantum physics and relativity." There is an even more pointer example of the Prussian academy of sciences reviewing the Dr. application of Hertz ...
  • dejanpetkow on 16 Dec 11
     
    Shocking. What is federal research funding for? No, wrong question. Instead maybe: What is federally funded review for?
LeopoldS

Graphite + water = the future of energy storage - Monash University - 6 views

www.monash.edu.au/...r-the-future-of-energy-storage

energy NRG storage graphene

shared by LeopoldS on 07 Nov 11 - No Cached
LeopoldS liked it
  • LeopoldS on 07 Nov 11
     
    any idea how this works - who wants to have a closer look at it?
  • ...3 more comments...
  • dejanpetkow on 08 Nov 11
     
    Water is used for keeping the graphene stacks separate. Without water or some other separation method the different graphene stacks would just stick together and graphene would lose its nice properties (like a huge surface). So, water has nothing to do with energy but is just the material which keeps the graphene stacks at distance. The result is a gel. Still, energy needs to be stored in the gel.
  • LeopoldS on 09 Nov 11
     
    and the different graphene layers act as anodes and cathodes??
  • dejanpetkow on 09 Nov 11
     
    Layer orientation in a gel is random. Additionally to that, cathodes and anodes are about charge seperation. Graphene layers are (as far as I understand) supposed to provide huge surfaces to which something, maybe a charge, can be attached. So do we need ions and electrons? Probably not. Probably just electrons which can travel easily through the gel. I guess the whole gel (and all layers inside) would be nagtively charged, making the gel blob a fluid cathode. But again, it's just a guess.
  • LeopoldS on 10 Nov 11
     
    Wouldn't it be worth having a closer look?
  • LeopoldS on 12 Nov 11
     
    it's still not clear to me how to get electricity in and out of this thing?
Christos Ampatzis

SWF Announces Young Professional Scholarships for IAC 2012 in Naples - 1 views

swfound.org/...arships-for-iac-2012-in-naples

science space

shared by Christos Ampatzis on 11 Jun 12 - No Cached
  • Christos Ampatzis on 11 Jun 12
     
    Secure World Foundation (SWF) is pleased to announce that it will be accepting applications from young professionals for scholarships to aid in traveling to present papers at the 2012 International Astronautical Congress (IAC) in Naples, Italy.
Marcus Maertens

Stephen Hawking: 'There are no black holes' : Nature News & Comment - 1 views

www.nature.com/...ere-are-no-black-holes-1.14583

PHY science space

shared by Marcus Maertens on 18 Feb 14 - No Cached
  • Marcus Maertens on 18 Feb 14
     
    Event Horizon - a modern myth?
  • dejanpetkow on 18 Feb 14
     
    GR is valid on large scales and is, therefore, a simplification of the unknown GUT. As such, the mathematical solutions obtained in GR are strictly speaking valid only within GR. Certainly, the solution called black hole is an extremely heavy object and at the same time extremely small - a point without geometrical extension. The latter is heavily in conflict with the validity range of the underlying theory and, hence, makes lots of people (including experts unlike me) question the concept of black holes despite the fact that something has been "observed" which fits into this concept. Regarding the movie: Event Horizon might be a myth but it emphasizes what Sante said in on of his presentations: Don't use a black hole for travelling, take the worm hole instead. The constructor of Event Horizon created a black hole not considering that the damn thing has no exit...where did he think the Event Horizon would end?
Thijs Versloot

Astronauts' hearts become more spherical in space - 0 views

scienceblog.com/...become-more-spherical-in-space

human travel mars

shared by Thijs Versloot on 01 Apr 14 - No Cached
  • Thijs Versloot on 01 Apr 14
     
    The new findings come from a recent NASA study in which 12 astronauts aboard the ISS took ultrasound images of their hearts before, during, and after their six-month stint in space. What they found confirmed scientists' previous prediction: In microgravity, the human heart becomes more spherical by a factor of nearly 10 percent.
Thijs Versloot

ISEE-3 Reboot Project - Recovering an satellite from deep space by crowdsourcing @Spac... - 3 views

www.rockethub.com/42228

space satellite crowdsourcing

shared by Thijs Versloot on 25 Apr 14 - No Cached
  • Thijs Versloot on 25 Apr 14
     
    "A band of space hackers and engineers are trying to do something never done before - recover a 36 year old NASA spacecraft from the grips of deep space and time. With old NASA documents and Rockethub crowdfunding, a team led by Dennis Wingo and Keith Cowing is attempting to steer ISEE-3, later rechristened ICE, the International Cometary Explorer, back into an Earth orbit and return it to scientific operations. Dennis says, 'ISEE-3 can become a great teaching tool for future engineers and scientists helping with design and travel to Mars'. Only 40 days remain before the spacecraft will be out of range for recovery. A radio telescope is available, propulsion designs are in hand and the team is hoping for public support to provide the small amount needed to accomplish a very unique milestone in space exploration
Ma Ru

F9R First Flight Test - 3 views

www.youtube.com/watch

F9R SpaceX space technology rocket landing launch

shared by Ma Ru on 27 Apr 14 - No Cached
LeopoldS liked it
  • Ma Ru on 27 Apr 14
     
    In case you have not seen this one yet...
  • Thijs Versloot on 28 Apr 14
     
    Nice one, very impressive (also filming it with a drone :)! I noticed at 0:56 that the exhaust flames do travel upwards on the descent. I wonder how much of a problem this would be for the actual reusability / next flight approval?
  • LeopoldS on 29 Apr 14
     
    impressive!
Juxi Leitner

Lotus Plant-Inspired Dust-Busting Shield To Protect Space Gear - 3 views

www.space-travel.com/...To_Protect_Space_Gear_999.html

technology bio spacecraft dust shielding

shared by Juxi Leitner on 29 Sep 09 - Cached
  • replicate to prevent dirt from accumulating on the surfaces of spacesuits, scientific instruments, robotic rovers, solar array panels and other hardware used to gather scientific data or carry out exploratory activities on other objects in the solar system
  • The team also is trying to partner with Northrop Grumman to add a biocide to the coating, which would kill bacteria that thrive and produce foul odors wherever people are confined to a small space for long periods, like the space station.
  • Tobias Seidl on 04 Oct 09
     
    We had some discussion about the Lotus-effect roughly two years ago. Zoe said that NASA surely worked on it. Well, she was right.
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