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LeopoldS

Phys. Rev. Lett. 105, 211303 (2010): Model for Gravity at Large Distances - 2 views

prl.aps.org/...e211303

phy science astronomy pioneer anomaly

shared by LeopoldS on 18 Nov 10 - No Cached
  • LeopoldS on 18 Nov 10
     
    Sante have a look at this ... Daniel is the TU researcher who did the study I was sending you a few years ago with Luzi - very nice and smart guy .... Luzi: now you will have difficulties in shooting :-)
pacome delva

Beetle beauty captured in silicon - physicsworld.com - 1 views

physicsworld.com/...44389

biomimicry beetles electromagnetism

shared by pacome delva on 22 Nov 10 - No Cached
  • Researchers in Canada have created a new material that mimics the brilliant iridescent colours seen in beetle shells. As the eye-catching effect can be switched off with the simple addition of water, the researchers believe their new material could lead to applications including "smart windows".
Nina Nadine Ridder

Stratospheric Water Vapor is a Global Warming Wild Card - 1 views

www.sciencedaily.com/...100131145840.htm

global_warming climate_models water_cycle

shared by Nina Nadine Ridder on 22 Feb 10 - Cached
  • Nina Nadine Ridder on 22 Feb 10
     
    Climate models are not able to reproduce the observed decrease in stratospheric water vapor which shows that the global water cycle is still not known well enough and further research is desperately needed. 
Luzi Bergamin

Finnish Centre of Excellence in ANALYSIS AND DYNAMICS RESEARCH - 2 views

wiki.helsinki.fi/...Home

phy bio mathematics science

shared by Luzi Bergamin on 03 Mar 10 - Cached
  • Luzi Bergamin on 03 Mar 10
     
    In case you are lacking some catchy ideas, here is the Finnish version of research that Leo certainly likes.
  • Dario Izzo on 03 Mar 10
     
    but at the end is Navier Stokes and turbulence and a few papers on fractals...... catchy?
Dario Izzo

Probabilistic Logic Allows Computer Chip to Run Faster - 3 views

www.azonano.com/news.asp

INF MAD probabilistic computing AI

shared by Dario Izzo on 07 Dec 09 - Cached
  • Dario Izzo on 07 Dec 09
     
    Francesco pointed out this research one year ago, we dropped it as noone was really considering it ... but in space a low CPU power consumption is crucial!! Maybe we should look back into this?
  • ...6 more comments...
  • Ma Ru on 07 Dec 09
     
    Q1: For the time being, for what purposes computers are mainly used on-board?
  • Dario Izzo on 07 Dec 09
     
    for navigation, control, data handling and so on .... why?
  • Ma Ru on 07 Dec 09
     
    Well, because the point is to identify an application in which such computers would do the job... That could be either an existing application which can be done sufficiently well by such computers or a completely new application which is not already there for instance because of some power consumption constraints... Q2 would be then: for which of these purposes strict determinism of the results is not crucial? As the answer to this may not be obvious, a potential study could address this very issue. For instance one can consider on-board navigation systems with limited accuracy... I may be talking bullshit now, but perhaps in some applications it doesn't matter whether a satellite flies on the exact route but +/-10km to the left/right? ...and so on for the other systems. Another thing is understanding what exactly this probabilistic computing is, and what can be achieved using it (like the result is probabilistic but falls within a defined range of precision), etc. Did they build a complete chip or at least a sub-circiut, or still only logic gates...
  • Dario Izzo on 07 Dec 09
     
    Satellites use old CPUs also because with the trend of going for higher power modern CPUs are not very convenient from a system design point of view (TBC)... as a consequence the constraints put on on-board algorithms can be demanding. I agree with you that double precision might just not be necessary for a number of applications (navigation also), but I guess we are not talking about 10km as an absolute value, rather to a relative error that can be tolerated at level of (say) 10^-6. All in all you are right a first study should assess what application this would be useful at all.. and at what precision / power levels
  • Joris _ on 07 Dec 09
     
    The interest of this can be a high fault tolerance for some math operations, ... which would have for effect to simplify the job of coders! I don't think this is a good idea regarding power consumption for CPU (strictly speaking). The reason we use old chip is just a matter of qualification for space, not power. For instance a LEON Sparc (e.g. use on some platform for ESA) consumes something like 5mW/MHz so it is definitely not were an engineer will look for some power saving considering a usual 10-15kW spacecraft
  • Dario Izzo on 07 Dec 09
     
    What about speed then? Seven time faster could allow some real time navigation at higher speed (e.g. velocity of a terminal guidance for an asteroid impactor is limited to 10 km/s ... would a higher velocity be possible with faster processors?) Another issue is the radiation tolerance of the technology ... if the PCMOS are more tolerant to radiation they could get more easily space qualified.....
  • Joris _ on 08 Dec 09
     
    I don't remember what is the speed factor, but I guess this might do it! Although, I remember when using an IMU that you cannot have the data above a given rate (e.g. 20Hz even though the ADC samples the sensor at a little faster rate), so somehow it is not just the CPU that must be re-thought. When I say qualification I also imply the "hardened" phase.
  • Francesco Biscani on 08 Dec 09
     
    I don't know if the (promised) one-order-of-magnitude improvements in power efficiency and performance are enough to justify looking into this. For once, it is not clear to me what embracing this technology would mean from an engineering point of view: does this technology need an entirely new software/hardware stack? If that were the case, in my opinion any potential benefit would be nullified. Also, is it realistic to build an entire self-sufficient chip on this technology? While the precision of floating point computations may be degraded and still be useful, how does all this play with integer arithmetic? Keep in mind that, e.g., in the Linux kernel code floating-point calculations are not even allowed/available... It is probably possible to integrate an "accelerated" low-accuracy floating-point unit together with a traditional CPU, but then again you have more implementation overhead creeping in. Finally, recent processors by Intel (e.g., the Atom) and especially ARM boast really low power-consumption levels, at the same time offering performance-boosting features such as multi-core and vectorization capabilities. Don't such efforts have more potential, if anything because of economical/industrial inertia?
pacome delva

Quantum dots boost solar cell efficiencies - 2 views

physicsworld.com/...38046

phy solar_cells quantum_dots

shared by pacome delva on 15 Dec 09 - No Cached
  • pacome delva on 15 Dec 09
     
    Apparently there is a project going on in ESA on this topic led by TEC-EP, the contact person is Evelyne Simon. I really would like to do some research on these topics to see if we can find something interesting that would not have been considered in this study.
Joris _

Earth's atmosphere came from outer space, find scientists - 3 views

www.physorg.com/news179676765.html

climate research space

shared by Joris _ on 11 Dec 09 - Cached
  • From that we now know that the volcanic gases could not have contributed in any significant way to the Earth's atmosphere
  • LeopoldS on 11 Dec 09
     
    tried to find the original science paper but could not .... the only one I found was this one: http://sciencenow.sciencemag.org/cgi/content/full/2009/1210/2
  • ...1 more comment...
  • Nina Nadine Ridder on 11 Dec 09
  • nikolas smyrlakis on 14 Dec 09
     
    "Plan 9 from outer space" quote confirmed : atmospheric conditions in outer space stall communications! Wonder how many more facts of the movie will prove right in the end...
  • pacome delva on 14 Dec 09
     
    very interesting study. Although it is not so much a surprise, they cite many papers on planetary formation that predicted this, and the only paper on degassing they cite is from our rather unpopular french ex-minister of research c. allegre, who refuses the fact that humans have an impact on climate...
LeopoldS

http://www.eecs.umich.edu/~valeria/research/publications/DATE10RSA.pdf - 1 views

www.eecs.umich.edu/...DATE10RSA.pdf

cryptography computer INF

shared by LeopoldS on 08 Mar 10 - No Cached
  • LeopoldS on 08 Mar 10
     
    nice ... hacking a 1024-bit RSA key in 100 hours .... Francesco will like this one
Ma Ru

Researcher Creates 'Facebook for Scientists' - 1 views

www.nytimes.com/...book-for-scientists-22081.html

inf Web 2.0 ariadnet science

shared by Ma Ru on 19 Mar 10 - Cached
  • Ma Ru on 19 Mar 10
  • ...4 more comments...
  • LeopoldS on 20 Mar 10
     
    and we are of course there since some time :-) and even have our own group in there ... think that Tobias has first discovered it our group is: https://www.researchgate.net/group/ESA_Advanced_Concepts_Team/ everybody welcome to join ... though Ariadnet is better
  • Ma Ru on 23 Mar 10
     
    So if I'm already on Ariadnet, there's no need for me to join this researchgate thingy? Pheew..
  • Luzi Bergamin on 23 Mar 10
     
    Very active group, it has exactly one member (Leo) and exactly zero (ZERO,0!!) posts since June 13, 2008!!! Well, sounds like a very typical ACT action in order to increase the key performance indicators :D.
  • Ma Ru on 23 Mar 10
     
    Oh come on Luzi, don't be over-pessimistic! It's just because all activity takes place on Ariadnet ;-)
  • nikolas smyrlakis on 24 Mar 10
     
    tsk tsk typical ex-ACT criticism.. Maybe for me too from next week;P
  • Luzi Bergamin on 24 Mar 10
     
    WRONG! You ignore the fact that I complained already while I was yet in the ACT!! Seriously: I clicked around in "ResearchGate" a little bit, couldn't find too many interesting things. Many scientists from India, Iran etc. desperately looking for contacts, retired engineers/scientists from industry that now remember that they were once at university and also quite a number of semi-crackpots. My honest conclusion: not a must. Btw: wish you a nice post-ACT depression! Keep a stiff upper lip, esp. in case you go back to Greece...
pacome delva

Girls Get Math: It's Culture That's Skewed - 2 views

www.livescience.com/...090601-gender-math.html

sociology math

shared by pacome delva on 19 Apr 10 - Cached
  • "There's a gender stereotype that boys are better at math than girls are, and stereotypes die very hard," Hyde told LiveScience. "Teachers and parents still believe that boys are better at math than girls are." The researchers provide several possible cultural factors keeping females from excelling in math, including classroom dynamics in which teachers pay more attention to boys, while even mathematically gifted girls are not nurtured. In addition, stereotypes may drive guidance counselors and others to discourage girls from taking engineering courses.
  • Nina Nadine Ridder on 26 Apr 10
     
    The guidance counselor at my high school discouraged me to study physics but was very excited when I was contemplating to become a teacher. Maybe I should send her this article...
  • Luzi Bergamin on 26 Apr 10
     
    Oh yeah, real new!! And in the 90s it was obvious that girls are smarter but discriminated, today its obvious that the poor boys are neglected; some years ago female teachers were proven to discriminate even stronger against girls than male teachers and today politicians demand more male teachers... because they would pay more attention to the neglected boys! Great, that's what I like about sociological research, every couple of years one can sell the same old story again and again and again... sorry, I'm in a real bullshitter mood today!
  • Nicholas Lan on 27 Apr 10
     
    gotta agree with luzi here. girls at secondary school in the UK have been outperforming boys for years now after numerous government programmes. As to guidance counsellors - if they were any good at guidance wouldn't they have better jobs?
pacome delva

Researchers Solve the Mystery of the Zodiacal Light - 0 views

news.sciencemag.org/...hers-solve-the-mystery-of.html

phy astrophysics comets zodiacal_light

shared by pacome delva on 19 Apr 10 - Cached
  • Zodiacal light—the faint white glow that stretches across the darkest skies, tracing the same path the sun takes—has mystified scientists for centuries. They've known that it is sunlight reflected from a disk of dust spanning the inner solar system from Mercury to Jupiter. They just didn’t know where the dust came from—until now.
LeopoldS

The Salvinia Paradox: Superhydrophobic Surfaces with Hydrophilic Pins for Air Retention... - 2 views

www3.interscience.wiley.com/...abstract

BIO biomimetics bionics

shared by LeopoldS on 09 May 10 - No Cached
  • LeopoldS on 09 May 10
     
    not yet for space'ships' but nice biomimetic research
Dario Izzo

Advanced Space Concepts Laboratory > Podcasts - 4 views

ewds.strath.ac.uk/...Podcasts.aspx

concepts advanced space

shared by Dario Izzo on 12 May 10 - Cached
  • Dario Izzo on 12 May 10
     
    A cool way of organizing a research group seminars (should we do it for the science coffee?)
santecarloni

Partial reversal of aging achieved in mice | Harvard Gazette - 0 views

news.harvard.edu/...rsal-of-aging-achieved-in-mice

aging bio technology

shared by santecarloni on 21 May 11 - No Cached
LeopoldS liked it
  • santecarloni on 21 May 11
     
    Researchers led by Ronald A. DePinho (above), a Harvard Medical School professor of genetics, say their work shows for the first time a dramatic reversal of many aspects of age-related degeneration in mice, a milestone in aging science achieved by engineering mice with a controllable telomerase gene. T
  • LeopoldS on 22 May 11
     
    I would not yet volunteer ....
LeopoldS

The Army's Bold Plan to Turn Soldiers Into Telepaths | Machine-Brain Connections | DISC... - 0 views

discovermagazine.com/...n-turn-soldiers-into-telepaths

bio technology BMI

shared by LeopoldS on 25 Jul 11 - No Cached
  • LeopoldS on 25 Jul 11
     
    "The mind reader is Gerwin Schalk, a 39-year-old biomedical scientist and a leading expert on brain-computer interfaces at the New York State Department of Health's Wads­worth Center at Albany Medical College. The 28Austrian-born Schalk, along with a handful of other researchers, is part of a $6.3 million U.S. Army project to establish the basic science required to build a thought helmet-a device that can detect and transmit the unspoken speech of soldiers, allowing them to communicate with one another silently." ...
  • Ma Ru on 01 Aug 11
santecarloni

Optical measurement of cycle-dependent cell growth - 0 views

www.pnas.org/13124

cell growth BIO

shared by santecarloni on 26 Aug 11 - No Cached
  • santecarloni on 26 Aug 11
     
    Researchers developed a new imaging method that can measure cell mass using two beams of light, offering new insight into the much-debated problem of whether cells grow at a constant rate or exponentially. They found that mammalian cells show clear exponential growth only during the G2 phase of the cell cycle. This information has great implications not only for basic biology, but also for diagnostics, drug development and tissue engineering.
LeopoldS

Shake, rattle and … power up? - MIT News Office - 0 views

web.mit.edu/...ower-from-vibrations-0914.html

NRG

shared by LeopoldS on 16 Sep 11 - No Cached
  • Instead of taking a cantilever-based approach, the team went a slightly different route, engineering a microchip with a small bridge-like structure that’s anchored to the chip at both ends. The researchers deposited a single layer of PZT to the bridge, placing a small weight in the middle of it. The team then put the device through a series of vibration tests, and found it was able to respond not just at one specific frequency, but also at a wide range of other low frequencies. The researchers calculated that the device was able to generate 45 microwatts of power with just a single layer of PZT — an improvement of two orders of magnitude compared to current designs.
  • LeopoldS on 16 Sep 11
     
    should we have another look at this type of technology?
LeopoldS

Romo- The Smartphone Robot by Romotive - Kickstarter - 3 views

www.kickstarter.com/...romo-the-smartphone-robot

INF technology AI

shared by LeopoldS on 10 Oct 11 - No Cached
  • LeopoldS on 10 Oct 11
     
    Could we use this for swarm robotics research?
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