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ESA ACT

Fertigungsverfahren Thixomoulding: Vorbild Treibsand - Auto - SPIEGEL ONLINE - Nachrichten - 0 views

www.spiegel.de/...0,1518,510667,00.html

engineering leightweight

shared by ESA ACT on 24 Apr 09 - Cached
  • ESA ACT on 24 Apr 09
     
    A method, formerly unknown to me. Maybe the mechanical engineers find it interesting.
ESA ACT

OpenHTMM Released - 0 views

googleresearch.blogspot.com/...openhtmm-released.html

INF AI algorithm open-source

shared by ESA ACT on 24 Apr 09 - Cached
  • ESA ACT on 24 Apr 09
     
    Statistical methods of text analysis have become increasingly sophisticated over the years. A good example is automated topic analysis using latent models, two variants of which are Probabilistic latent semantic analysis and Latent Dirichlet Allocation.
Ma Ru

Egyptian mummification method resurrected in the UK - 0 views

www.newscientist.com/...tian-mummification-method.html

BIO technology science history egypt mummy UK

shared by Ma Ru on 18 Oct 11 - No Cached
  • Ma Ru on 18 Oct 11
     
    Torquay's disturbingly close to Plymouth... Good quote: "I'm the only woman in the country who's got a mummy for a husband". Yay.
annaheffernan

Particle accelerator barely bigger than a grain of sand - 3 views

gizmodo.com/bigger-than-a-grain-1426829083

technology PHY science

shared by annaheffernan on 07 Oct 13 - No Cached
  • annaheffernan on 07 Oct 13
     
    Just getting a particle up to near the speed of light isn't good enough for today's physics. To properly unravel the fundamentals of the universe, particles have to be smashed together with enormous force. And two Stanford researchers have just devised a laser-based method that imparts ten times the power of traditional methods at a fraction of the cost.
annaheffernan

Laser shines a new light on isotope separation - 0 views

physicsworld.com/...ew-light-on-isotope-separation

shared by annaheffernan on 07 Jul 14 - No Cached
  • annaheffernan on 07 Jul 14
     
    A new method of separating nuclear isotopes that exploits the slight differences in their electronic energy levels has been developed by physicists in the US. The energy-efficient separator was used to create isotopically pure lithium-7, which is used in some nuclear reactors. Good news for any future nuclear powered space missions perhaps? It could potentially replace the current (and much less energy efficient) methods that were developed in the 1950's
Isabelle Dicaire

Experimental space telescopes to be 3D-printed at NASA - Laser Focus World - 0 views

www.laserfocusworld.com/...-to-be-3d-printed-at-nasa.html

shared by Isabelle Dicaire on 08 Aug 14 - No Cached
  • Isabelle Dicaire on 08 Aug 14
     
    From the article: By the end of September 2014, Jason Budinoff, an aerospace engineer at NASA's Goddard Space Flight Center (Greenbelt, MD), is expected to complete the first imaging telescopes ever assembled almost exclusively from 3D-manufactured components. The devices' optics and electronics will be fabricated using conventional methods. "As far as I know, we are the first to attempt to build an entire instrument with 3D printing," says Budinoff. He is building a fully functional 50 mm camera whose outer tube, baffles, and optical mounts are all printed as a single structure. The instrument is appropriately sized for a CubeSat (a small satellite made of individual units each about 100 mm on a side). 
Christophe Praz

Scientific method: Defend the integrity of physics - 2 views

www.nature.com/...e-integrity-of-physics-1.16535

PHY METAPHY

shared by Christophe Praz on 17 Dec 14 - No Cached
LeopoldS liked it
  • Christophe Praz on 17 Dec 14
     
    Interesting article about theoretical physics theories vs. experimental verification. Can we state that a theory can be so good that its existence supplants the need for data and testing ? If a theory is proved to be untestable experimentally, can we still say that it is a scientific theory ? (not in my opinion)
  • johannessimon81 on 17 Dec 14
     
    There is an interesting approach by Feynman that it does not make sense to describe something of which we cannot measure the consequences. So a theory that is so removed from experiment that it cannot be backed by it is pointless and of no consequence. It is a bit as with the statement "if a tree falls in the forrest and nobody is there to hear it, does it make a sound?". We would typically extrapolate to say that it does make a sound. But actually nobody knows - you would have to take some kind of measurement. But even more fundamentally it does not make any difference! For all intents and purposes there is no point in forcing a prediction that you cannot measure and that therefore has noto reflect an event in your world.
  • Ma Ru on 24 Dec 14
     
    "Mathematics is the model of the universe, not the other way round" - M. R.
Thijs Versloot

Getting rid of corporate email - 1 views

www.wired.com/...-memo-hell-designing-work-flow

working methods email

shared by Thijs Versloot on 19 May 14 - No Cached
  • Thijs Versloot on 19 May 14
     
    Now something on working methods... More than anything else Box does, Notes seems to embody the philosophy that in business, you never write for the sake of writing. You write to share with people. After all, memos were never meant to be ends in themselves-just the means.
LeopoldS

Alibaba's AI Outguns Humans in Reading Test - Bloomberg - 4 views

www.bloomberg.com/...s-in-key-stanford-reading-test

AI

shared by LeopoldS on 17 Jan 18 - No Cached
  • LeopoldS on 17 Jan 18
     
    any papers or insights on methods available?
  • dharmeshtailor on 18 Jan 18
     
    Couldn't find a paper for Alibaba's results but Microsoft Research's performance on this dataset was very close. The paper is here: https://www.microsoft.com/en-us/research/wp-content/uploads/2017/05/r-net.pdf Btw the 'reading test' is a publicly available dataset called 'Stanford Question Answering Dataset (SQuAD)'. Their website shows a leaderboard: https://rajpurkar.github.io/SQuAD-explorer/
Luís F. Simões

Physicists Discover a Whopping 13 New Solutions to Three-Body Problem - ScienceNOW - 1 views

news.sciencemag.org/...cists-discover-a-whopping.html

MAD

shared by Luís F. Simões on 10 Mar 13 - No Cached
  • The discovery of 13 new families, made by physicists Milovan Šuvakov and Veljko Dmitrašinović at the University of Belgrade, brings the new total to 16.
  • All the solutions can be viewed online
  • Dario Izzo on 10 Mar 13
     
    They search numerically for initial conditions resulting in periodic orbits. Reminds to me the methods we employed for the "search for invariant relative motion" and which brought us to discover the magic inclinations (47.9 degrees). I wonder what are the implications. In any case nice plots :)
  • Francesco Biscani on 11 Mar 13
     
    Haven't read in detail, but it's not clear to me what it means exactly. If they were discovered numerically (I assume it means via numerical integration), how can they be sure the orbits are truly periodic?
LeopoldS

[1305.3913] Indication of anomalous heat energy production in a reactor device - 5 views

arxiv.org/1305.3913

shared by LeopoldS on 23 May 13 - No Cached
  • LeopoldS on 23 May 13
     
    looks like some backwind for all the cold fusion believers ...
  • ...1 more comment...
  • johannessimon81 on 24 May 13
     
    Actually Sante and me just reviewed their paper. Although (some of) the scientists in the paper seem to have good track records their experimental techniques are by far not the best to determine the excess amount of energy produced. Even though their methods may introduce fairly large errors they would not be able to negate the cited power output - so they either are super-sloppy (i.e. they lie) or there is TRULY new physics involved... A big problem is that they are basically verifying somebody else's experiment - however because this guy is paranoid he does not tell them exactly what he did. In fact they went to his lab and used a setup that HE put together. All they do is do a measurement on it and it seems like they try to be thorough. There is quite a chance that the guy behind it all (Rossi) is setting them up - personally I would think >95%. However, the implications of this being new physics are so big that I think further research should be conducted.
  • LeopoldS on 24 May 13
     
    I just answered something very similar to Franco, except the conclusions: I don't think that there is a good reason for us or anybody else in ESA to get involved at this stage.
  • johannessimon81 on 24 May 13
     
    I agree - if this device would work it there would be other interest groups (like the energy sector) with a much more concrete stake in the technology.
johannessimon81

Nano-Suit Protects Bugs From Space-Like Vacuums - 0 views

www.wired.com/...nano-suit-vacuum

BIO science space

shared by johannessimon81 on 17 Apr 13 - No Cached
  • johannessimon81 on 17 Apr 13
     
    Electron microscope studies reveal that the electron bombardment leads to polymerization of the outer layer of some insect larva's skin and protects them from dehydration. Artificial method to create this effect tested as well. Allows observation of living animals under electron microscope! Question: can the insects still breath after they are back in air? :-S
Guido de Croon

Robotic insects make first controlled flight - 3 views

news.harvard.edu/...s-make-first-controlled-flight

science AI BIO

shared by Guido de Croon on 03 May 13 - No Cached
  • Guido de Croon on 03 May 13
     
    The Robobee takes off without guide wires! It is still powered via a wire, and the control is done with the help of a VICON system and on an external computer, but this still is an amazing feat!
  • johannessimon81 on 03 May 13
     
    The way they make this thing is just as impressive. The manufacturing technique is "pop-up book" folding, a method that has been developed by the same group and that allows a two dimensional monolithic MEMS structures to be easily assembled into a 3D structure. I actually put this as an item of the "Technology List 2020" on the wiki this morning.
  • Dario Izzo on 05 May 13
     
    I agree, manufacturing is the amazing thing here ..... as soon as the power-consumption/density problem is solved these things will really take off :)
Athanasia Nikolaou

A Proposal For Juno To Observe The Volcanoes Of Io - Universe Today - 0 views

www.universetoday.com/...osal-juno-observe-volcanoes-io

space optimisation

shared by Athanasia Nikolaou on 31 Jan 17 - No Cached
  • Athanasia Nikolaou on 31 Jan 17
     
    Combination of the radio occultation method plus change in the orbital plan in order to observe new target (the volcanic outgassing from Io satellite) by passing though the magnetosphere of Jupiter. It poses a challenge in the sensitivity of the electronics. Maybe it is accepted if the risk is low. Idea for the next GTOC challenge maybe? Optimising the cost on the electronics vs the frequency of passages?
Luke O'Connor

Trajectory of a falling Batman - 2 views

physics.le.ac.uk/...289

shared by Luke O'Connor on 10 Jul 12 - No Cached
  • Luke O'Connor on 10 Jul 12
     
    The film Batman Begins shows the character of Batman gliding using a rigid form of his cape. This paper assesses the feasibility of such a glide and fi nds that while a reasonable distance could be travelled if gliding from a tall building, the speed at which Batman would be travelling would be too dangerous to stop without some method of slowing down.
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?
Luke O'Connor

Software Detects Motion that the Human Eye Can't See - 4 views

www.technologyreview.com/...motion-that-the-human-eye-cant

shared by Luke O'Connor on 24 Jul 12 - No Cached
  • Luke O'Connor on 24 Jul 12
     
    The video technique could lead to remote diagnostic methods, like the ability to detect the heart rate of someone on a screen.
  • Luke O'Connor on 24 Jul 12
     
    Are there potential applications to earth observation etc..?
  • Luke O'Connor on 24 Jul 12
Luís F. Simões

Poison Attacks Against Machine Learning - Slashdot - 1 views

tech.slashdot.org/...tacks-against-machine-learning

machine learning classification security

shared by Luís F. Simões on 23 Jul 12 - No Cached
  • Support Vector Machines (SVMs) are fairly simple but powerful machine learning systems. They learn from data and are usually trained before being deployed.
  • In many cases they need to continue to learn as they do the job and this raised the possibility of feeding it with data that causes it to make bad decisions. Three researchers have recently demonstrated how to do this with the minimum poisoned data to maximum effect. What they discovered is that their method was capable of having a surprisingly large impact on the performance of the SVMs tested. They also point out that it could be possible to direct the induced errors so as to produce particular types of error.
  • Luís F. Simões on 23 Jul 12
     
    http://arxiv.org/abs/1206.6389v2 for Guido; an interesting example of "takeover" research
Athanasia Nikolaou

Spray cyanobacteria on the desert to halt its spread - 2 views

www.newscientist.com/...desert-to-halt-its-spread.html

climate BIO

shared by Athanasia Nikolaou on 20 Jan 14 - No Cached
LeopoldS liked it
  • Athanasia Nikolaou on 20 Jan 14
     
    A wide scale 8 year experiment in China on combating desertification seems to have been successful. Instead of using cyanobacteria blooms in the sea, the tested method proposes to spray them on the boundaries of desert/farmland every few days, so that the carbon they capture stays on the ground. It is useful in fixing the organic material against wind erosion only complementary to planting hardy grasses. Very fast result, nevertheless. Could be classified as a geoengineering activity.
  • LeopoldS on 22 Jan 14
     
    130 km2 as next step will be quite an area
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