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ESA ACT

Web usage data outline map of knowledge : Nature News - 0 views

www.nature.com/...458135a.html

web2.0 internet

shared by ESA ACT on 24 Apr 09 - No Cached
  • ESA ACT on 24 Apr 09
     
    Very interesting analysis of scientific fields and their interconnections
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.""
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
anonymous

OpenBCI - 5 views

openbci.com

BIO INF AI brain user interface EEG

shared by anonymous on 12 Aug 14 - No Cached
  • anonymous on 12 Aug 14
     
    "The OpenBCI Board is a versatile and affordable analog-to-digital converter that can be used to sample electrical brain activity (EEG), muscle activity (EMG), heart rate (EKG), and more" Perhaps some work or ideas on brainwave analysis would be interesting ? (User interfaces, mood classifier, detection of various alertness levels )
  • ...1 more comment...
  • Thijs Versloot on 13 Aug 14
     
    lets get one? And then link to the Oculus Rift to control it with my brain.. I want to think about running on Mars and then be doing it :)
  • Paul N on 20 Aug 14
     
    It's not worth it for $400... The chips are seriously nothing special and you can get a lot better for a lot cheaper. I would just get the electrodes and link them to a RPi or an Odroid or something.
  • Thijs Versloot on 21 Aug 14
     
    True, but the selling feature here is that they take care of that stuff and sell it for 400$. Lets say the hardware is 100USD, then an RF-grade person here here has to do the coding, interfacing, testing within roughly (300/16eur/hour) 20 hours to break even and even then the interface is much nicer in their case.
LeopoldS

Operation Socialist: How GCHQ Spies Hacked Belgium's Largest Telco - 4 views

firstlook.org/...elgacom-hack-gchq-inside-story

IT security hacking safety networks

shared by LeopoldS on 16 Dec 14 - No Cached
  • LeopoldS on 16 Dec 14
     
    interesting story with many juicy details on how they proceed ... (similarly interesting nickname for the "operation" chosen by our british friends) "The spies used the IP addresses they had associated with the engineers as search terms to sift through their surveillance troves, and were quickly able to find what they needed to confirm the employees' identities and target them individually with malware. The confirmation came in the form of Google, Yahoo, and LinkedIn "cookies," tiny unique files that are automatically placed on computers to identify and sometimes track people browsing the Internet, often for advertising purposes. GCHQ maintains a huge repository named MUTANT BROTH that stores billions of these intercepted cookies, which it uses to correlate with IP addresses to determine the identity of a person. GCHQ refers to cookies internally as "target detection identifiers." Top-secret GCHQ documents name three male Belgacom engineers who were identified as targets to attack. The Intercept has confirmed the identities of the men, and contacted each of them prior to the publication of this story; all three declined comment and requested that their identities not be disclosed. GCHQ monitored the browsing habits of the engineers, and geared up to enter the most important and sensitive phase of the secret operation. The agency planned to perform a so-called "Quantum Insert" attack, which involves redirecting people targeted for surveillance to a malicious website that infects their computers with malware at a lightning pace. In this case, the documents indicate that GCHQ set up a malicious page that looked like LinkedIn to trick the Belgacom engineers. (The NSA also uses Quantum Inserts to target people, as The Intercept has previously reported.) A GCHQ document reviewing operations conducted between January and March 2011 noted that the hack on Belgacom was successful, and stated that the agency had obtained access to the company's
  • Paul N on 19 Dec 14
     
    I knew I wasn't using TOR often enough...
  • Ma Ru on 24 Dec 14
     
    Cool! It seems that after all it is best to restrict employees' internet access only to work-critical areas... @Paul TOR works on network level, so it would not help here much as cookies (application level) were exploited.
Wiktor Piotrowski

MIT Analysis Paints Bleak Outcome for Mars One Concept - UPDATE - 5 views

www.spacepolicyonline.com/...k-outcome-for-mars-one-concept

space FUN

shared by Wiktor Piotrowski on 10 Oct 14 - No Cached
  • Wiktor Piotrowski on 10 Oct 14
     
    A nice study on the soon cancelled-before-it-began hit TV show "MarsOne" (or, how it should be called, "How to make someone else rich while slowly dying on Mars").
LeopoldS

Wearable sweat sensor paves way for real-time analysis of body chemistry : Nature News ... - 0 views

www.nature.com/...ysis-of-body-chemistry-1.19254

gadget flexible electronics

shared by LeopoldS on 27 Jan 16 - No Cached
  • LeopoldS on 27 Jan 16
     
    seems also potentially useful for astronauts ...
Annalisa Riccardi

An open-source MDAO framework written in Python - 1 views

openmdao.org

shared by Annalisa Riccardi on 03 Apr 13 - No Cached
LeopoldS liked it
  • Annalisa Riccardi on 03 Apr 13
     
    Multidisciplinary Design Analysis and Optimization framework developed by NASA since 2010
johannessimon81

Asteroid mining could lead to self-sustaining space stations - VIDEO!!! - 5 views

www.guardian.co.uk/...id-mining-space-stations-video

fun

shared by johannessimon81 on 23 Jan 13 - No Cached
  • johannessimon81 on 23 Jan 13
     
    Let's all start up some crazy space companies together: harvest hydrogen on Jupiter, trap black holes as unlimited energy supplies, use high temperatures close to the sun to bake bread! Apparently it is really easy to do just about anything and Deep Space Industries is really good at it. Plus: in their video they show Mars One concepts while referring to ESA and NASA.
  • ...3 more comments...
  • Marcus Maertens on 23 Jan 13
     
    I really wonder what they wanna mine out there? Is there such a high demand on... rocks?! And do they really think they can collect fuel somewhere?
  • Wiktor Piotrowski on 24 Jan 13
     
    Well they want to avoid having to send resources into space and rather make it all in space. The first mission is just to find possible asteroids worth mining and bring some asteroid rocks to Earth for analysis. In 2020 they want to start mining for precious metals (e.g. nickel), water and such.They also want to put up a 3D printer in space so that it would extract, separate and/or fuse asteroidal resources together and then print the needed structures already in space. And even though on earth it's just rocks, in space a tonne of them has an estimated value of 1 million dollars (as opposed to 4000 USD on Earth). Although I like the idea, I would put DSI in the same basket as those Mars One nutters 'cause it's not gonna happen.
  • johannessimon81 on 25 Jan 13
     
    I will get excited once they demonstrate they can put a random rock into their machine and out comes a bicycle (then the obvious next step is a space station).
  • Joris _ on 26 Jan 13
     
    hmm aside from the technological feasibility, their approach still should be taken as an example, and deserve a little support. By tackling such difficult problems, they will devise innovative stuffs. Plus, even if this doom-to-fail endeavour may still seem you useless, it creates jobs and make people think... it is already a positive! Final word: how is that different from what Planetary Resources plan to do? It is founded by a bunch of so-called "nuts" ... (http://www.planetaryresources.com/team/) ! a little thought: "We must never be afraid to go too far, for success lies just beyond" - Proust
  • johannessimon81 on 28 Jan 13
     
    I don't think that this proposal is very different from the one by Planetary Resources. My scepticism is rooted in the fact that - at least to my knowledge - fully autonomous mining technology has not even been demonstrated on Earth. I am sure that their proposition is in principle (technically) feasible but at the same time I do not believe that a privately funded company will find enough people to finance a multi-billion dollar R&D project that may or may not lead to an economically sensible outcome, i.e. generate profit (not income - you have to pay back the R&D cost first) within the next 25 years. And on that timescale anything can happen - for all we know we will all be slaves to the singularity by the time they start mining. I do think that people who tackle difficult problems deserve support - and lots of it. It seems however that up till now they have only tackled making a promotional video... About job creation (sorry for the sarcasm): if usefulness is not so important my proposal would be to give shovels to two people - person A digs a hole and person B fills up the same hole at the same time. The good thing about this is that you can increase the number of jobs created simply by handing out more shovels.
Daniel Hennes

CubeSat Ambipolar Thruster - 2 views

www.kickstarter.com/...er-for-interplanetary-cubesats

space technology

shared by Daniel Hennes on 04 Jul 13 - No Cached
LeopoldS liked it
  • Daniel Hennes on 04 Jul 13
     
    "Cast your name into deep space in style!"
  • dejanpetkow on 04 Jul 13
     
    Interesting approach, but with 99.9% probability they will miserably fail (at least in terms of their time schedule) simply because the technology is untested. I haven't read the refs (which miss by the way important works of E. Ahedo et al. on magnetic nozzle acceleration by ambipolar effects), but 1. using water means that you produce oxygen radicals which will erode chamber walls (ionisation efficiency is not 100% and experimental tests haven't been performed yet). 2. Electronic excitation (and radiation), rotational excitation, vibrational excitation, and dissociation are all processes which consume energy and reduce ionisation efficiency drastically. 3. It is a miniaturised Helicon thruster. Theoretical analysis probably does not consider near field effects. Far field models are probably not applicable due to the size of the thruster. I expect some surprises during thruster testing. In any case - good luck!
  • dejanpetkow on 05 Jul 13
     
    Apparently, there is only one qualification constraint regarding CubeSat propulsion which is related to volatile propellant. Since they use water as propellant and are also the owner of the CubeSat it is actually up to them how they qualify their thruster. Given that it is also possible to qualify the thruster within 18 months - since they define what "qualification" means.
Marion Nachon

Complexity Analysis of the Viking Labeled Release Experiments - 6 views

ijass.org/...year_abstract.asp

Bio Space

shared by Marion Nachon on 19 Apr 12 - No Cached
LeopoldS liked it
  • Marion Nachon on 19 Apr 12
     
    The only extraterrestrial life detection experiments ever conducted were the three which were components of the 1976 Viking Mission to Mars. Of these, only the Labeled Release experiment obtained a clearly positive response. [...] These analyses support the interpretation that the Viking LR experiment did detect extant microbial life on Mars.
  • Ma Ru on 19 Apr 12
     
    ...unless life arrived together with the nutrients...
  • LeopoldS on 21 Apr 12
     
    Viking was one of the best sterilised sc we have ever launched! Just strange to read such an article published in an obscure Korean journal ...
Joris _

Flashback Trojan Hits 550,000 Macs - 1 views

www.pcmag.com/...0,2817,2402641,00.asp

INF

shared by Joris _ on 05 Apr 12 - No Cached
  • Joris _ on 05 Apr 12
     
    Analysis of a recent Java flaw exploited by the Flashback Trojan reveals that more than 550,000 Macs were affected in the U.S. and abroad, according to anti-virus vendor Doctor Web. "This once again refutes claims by some experts that there are no cyber-threats to Mac OS X," Doctor Web said in a Tuesday blog post. lol :)
Luís F. Simões

Stochastic Pattern Recognition Dramatically Outperforms Conventional Techniques - Techn... - 2 views

www.technologyreview.com/...27598

stochastic probabilistic computing pattern_recognition robotics navigation

shared by Luís F. Simões on 23 Feb 12 - No Cached
  • A stochastic computer, designed to help an autonomous vehicle navigate, outperforms a conventional computer by three orders of magnitude, say computer scientists
  • These guys have applied stochastic computing to the process of pattern recognition. The problem here is to compare an input signal with a reference signal to determine whether they match.   In the real world, of course, input signals are always noisy so a system that can cope with noise has an obvious advantage.  Canals and co use their technique to help an autonomous vehicle navigate its way through a simple environment for which it has an internal map. For this task, it has to measure the distance to the walls around it and work out where it is on the map. It then computes a trajectory taking it to its destination.
  • Although the idea of stochastic computing has been around for half a century, attempts to exploit have only just begun. Clearly there's much work to be done. And since one line of thought is that the brain might be a stochastic computer, at least in part, there could be exciting times ahead.
  • ...1 more annotation...
  • Ref: arxiv.org/abs/1202.4495: Stochastic-Based Pattern Recognition Analysis
  • Luís F. Simões on 23 Feb 12
     
    hey! This is essentially the Probabilistic Computing Ariadna
  • LeopoldS on 25 Feb 12
     
    The link is there but my understanding of our purpose is different than what I understood from the abstract. In any case,the authors are from Palma de Mallorca, Balears, Spain "somebody" should somehow make them aware of the Ariadna study ... E.g somebody no longer in the team :-)
Tom Gheysens

Analysis of salamander jump reveals an unexpected twist - 1 views

www.sciencedaily.com/...140122102554.htm

BIO science phy technology

shared by Tom Gheysens on 23 Jan 14 - No Cached
LeopoldS liked it
  • LeopoldS on 24 Jan 14
     
    here is the video - did not really get the mechanism
  • LeopoldS on 24 Jan 14
Thijs Versloot

Long-range chemical sensors using new high power continuum lasers - 0 views

www.ns.umich.edu/...could-be-new-eyes-for-military

technology laser science

shared by Thijs Versloot on 09 Jul 13 - No Cached
  • Thijs Versloot on 09 Jul 13
     
    Short range chemical analysis methods exist already, but using new high power lasers one could extend the operation length to e.g aircraft.
  • LeopoldS on 16 Jul 13
     
    Isabelle?
  • Isabelle Dicaire on 18 Jul 13
     
    The optical setup is very simple and lightweight: a compact semi-conductor DFB laser source and an all optical fiber system for amplification and supercontinuum generation. Interesting for space applications!
johannessimon81

Teardown Shows iPhone 5S Costs at Least $199 to Build, $173 for the 5C - 0 views

allthingsd.com/...st-199-to-build-173-for-the-5c

technology

shared by johannessimon81 on 25 Sep 13 - No Cached
  • johannessimon81 on 25 Sep 13
     
    As discussed during lunch
Thijs Versloot

NASA set to debut online software catalog April 10 - 1 views

phys.org/...but-online-software-april.html

software

shared by Thijs Versloot on 06 Apr 14 - No Cached
LeopoldS liked it
  • Thijs Versloot on 06 Apr 14
     
    The catalog, a master list organized into 15 categories, is intended for industry, academia, other government agencies, and general public. The catalog covers technology topics ranging from project management systems, design tools, data handling, image processing, solutions for life support functions, aeronautics, structural analysis, and robotic and autonomous systems. NASA said the codes represent NASA's best solutions to an array of complex mission requirements. McMillan reported that "Within a few weeks of publishing the list, NASA says, it will also offer a searchable database of projects, and then, by next year, it will host the actual software code in its own online repository, a kind of GitHub for astronauts."
Dario Izzo

The Micro: The First Truly Consumer 3D Printer by M3D LLC - Kickstarter - 4 views

www.kickstarter.com/...irst-truly-consumer-3d-printer

3dprinters

shared by Dario Izzo on 02 May 14 - No Cached
  • Dario Izzo on 02 May 14
     
    We must get one of these. They had a goal of 50.000$ but got, instead more than 3,000,000$ !!
  • Ma Ru on 04 May 14
     
    Really bad market analysis on their part...
  • Nicholas Lan on 05 May 14
     
    https://www.kickstarter.com/projects/formlabs/form-1-an-affordable-professional-3d-printer?ref=live i think this is the one I was talking about the other day. ~3M$ from 100k$ target in 2012. I think I remembered it though cos they got sued for patent infringement and it was the first time kickstarter had been included in the lawsuit. I may even have posted the story on diigo...
Thijs Versloot

Need to analyse vast amounts of data? Listen to it! (NASA) - 2 views

www.nasa.gov/...nasa-scientists-listen-to-data

data analysis

shared by Thijs Versloot on 05 Sep 14 - No Cached
  • Thijs Versloot on 05 Sep 14
     
    Robert Alexander spends parts of his day listening to a soft white noise, similar to water falling on the outside of a house during a rainstorm. Every once in a while, he hears an anomalous sound and marks the corresponding time in the audio file.
  • Athanasia Nikolaou on 05 Sep 14
     
    I want this guy's job!
johannessimon81

Emperor LX chair: A way to never have your desk at the wrong height anymore - 6 views

www.geeky-gadgets.com/k-workstation-video-05-06-2013

FUN

shared by johannessimon81 on 21 Jun 13 - No Cached
  • johannessimon81 on 21 Jun 13
     
    Zivile can you order this for me?
  • ...2 more comments...
  • LeopoldS on 23 Jun 13
     
    would you really want to work in one of these?? I certainly wont ...
  • johannessimon81 on 23 Jun 13
     
    work, game, watch movies, eat... - I wonder if a toilet is included though. :-P
  • Ma Ru on 24 Jun 13
     
    I will get one as soon as they put it in a spherical dome like that of Darth Vader's...
  • dejanpetkow on 04 Jul 13
     
    @Johannes: The Japanese version will definitely have a toilet included, of course with health analysis, automatic appointment making with the doctors, life time estimation, diet planning, etc.
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