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Marion Nachon

NASA Spacecraft Data Suggest Water Flowing on Mars - 2 views

www.jpl.nasa.gov/...news.cfm

Science Climate

shared by Marion Nachon on 14 Jan 12 - No Cached
LeopoldS liked it
  • Marion Nachon on 14 Jan 12
     
    HIRISE (High Resolution Imaging Science Experiment) images show flows lengthen and darken on rocky equator-facing slopes from late spring to early fall. The seasonality, latitude distribution and brightness changes suggest a volatile material is involved, but there is no direct detection of one.
Kevin de Groote

Gephi, an open source graph visualization and manipulation software - 5 views

gephi.org

shared by Kevin de Groote on 05 Jun 12 - Cached
LeopoldS and Joris _ liked it
  • Kevin de Groote on 05 Jun 12
     
    Gephi is an interactive visualization and exploration platform for all kinds of networks and complex systems, dynamic and hierarchical graphs. Runs on Windows, Linux and Mac OS X. Gephi is open-source and free. Learn More on Gephi Platform " Gephi 0.8.1-beta has been released! Discover a new Timeline, dynamic ranking and weighted community detection.
Jacco Geul

US lab developing technology for space traffic control - 0 views

www.networkworld.com/...chnology-space-traffic-control

space debris tracking collisions

shared by Jacco Geul on 24 Jan 14 - No Cached
  • Jacco Geul on 24 Jan 14
     
    New technology (STARE-a constellation of nano-satellites) for tracking satellites and space debris could improve the accuracy from 1km (current by NORAD) to less than 100m. Increasing the reliability of collision detection, preventing 99% of false warnings.
Beniamino Abis

Antimatter experiment produces first beam of antihydrogen - 1 views

home.web.cern.ch/...oduces-first-beam-antihydrogen

science phy

shared by Beniamino Abis on 22 Jan 14 - No Cached
  • Beniamino Abis on 22 Jan 14
     
    The ASACUSA experiment at CERN has succeeded for the first time in producing a beam of antihydrogen atoms. The ASACUSA collaboration reports the unambiguous detection of 80 antihydrogen atoms 2.7 metres downstream of their production, where the perturbing influence of the magnetic fields used initially to produce the antiatoms is small. http://www.nature.com/ncomms/2014/140121/ncomms4089/full/ncomms4089.html
johannessimon81

A Different Form of Color Vision in Mantis Shrimp - 4 views

www.sciencemag.org/...411.full

technology BIO biomimetics science

shared by johannessimon81 on 28 Jan 14 - No Cached
  • johannessimon81 on 28 Jan 14
     
    Mantis shrimp seem to have 12 types of photo-receptive sensors - but this does not really improve their ability to discriminate between colors. Speculation is that they serve as a form of pre-processing for visual information: the brain does not need to decode full color information from just a few channels which would would allow for a smaller brain. I guess technologically the two extremes of light detection would be RGB cameras which are like our eyes and offer good spatial resolution, and spectrometers which have a large amount of color channels but at the cost of spatial resolution. It seems the mantis shrimp uses something that is somewhere between RGB cameras and spectrometers. Could there be a use for this in space?
  • Ma Ru on 31 Jan 14
     
    > RGB cameras which are like our eyes ...apart from the fact that the spectral response of the eyes is completely different from "RGB" cameras (http://en.wikipedia.org/wiki/File:Cones_SMJ2_E.svg) ... and that the eyes have 4 types of light-sensitive cells, not three (http://en.wikipedia.org/wiki/File:Cone-response.svg) ... and that, unlike cameras, human eye is precise only in a very narrow centre region (http://en.wikipedia.org/wiki/Fovea) ...hmm, apart from relying on tri-stimulus colour perception it seems human eyes are in fact completely different from "RGB cameras" :-) OK sorry for picking on this - that's just the colour science geek in me :-) Now seriously, on one hand the article abstract sounds very interesting, but on the other the statement "Why use 12 color channels when three or four are sufficient for fine color discrimination?" reveals so much ignorance to the very basics of colour science that I'm completely puzzled - in the end, it's a Science article so it should be reasonably scientifically sound, right? Pity I can't access full text... the interesting thing is that more channels mean more information and therefore should require *more* power to process - which is exactly opposite to their theory (as far as I can tell it from the abstract...). So the key is to understand *what* information about light these mantises are collecting and why - definitely it's not "colour" in the sense of human perceptual experience. But in any case - yes, spectrometry has its uses in space :-)
Thijs Versloot

Counting whales from space #plos - 1 views

www.plosone.org/...10.1371%2Fjournal.pone.0088655

satellite whales

shared by Thijs Versloot on 13 Feb 14 - No Cached
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  • Thijs Versloot on 13 Feb 14
     
    The WorldView2 satellite has a maximum 50 cm resolution and a water penetrating coastal band in the far-blue part of the spectrum that allows it to see deeper into the water column. Using an image covering 113 km2, we identified 55 probable whales and 23 other features that are possibly whales, with a further 13 objects that are only detected by the coastal band.
Luís F. Simões

Mars Code | Communications of the ACM - 1 views

cacm.acm.org/...fulltext

INF software redundancy fault detection model checking Curiosity Mars

shared by Luís F. Simões on 12 Mar 14 - No Cached
  • As can be expected, all functions on the rover, and on the spacecraft that brought it to its destination 350 million miles from Earth, are controlled by software. This article discusses some of the precautions the JPL flight software team took to improve its reliability.
  • Luís F. Simões on 12 Mar 14
     
    Interesting read if you're interested on the kind of coding that goes into something like the Curiosity rover. :) btw.. nice fill-packet being sent by Curiosity: "Elvis has Spirit. The answer is 42....END\r\n"
johannessimon81

Cosmological model without accelerated expansion proposed - 1 views

www.nature.com/...e-may-not-be-expanding-1.13379

science cosmology

shared by johannessimon81 on 07 Aug 13 - No Cached
  • johannessimon81 on 07 Aug 13
     
    Redshift in this model is partially produced by a change in the masses of elementary particles (and atoms)
  • ...3 more comments...
  • Thijs Versloot on 25 Aug 13
     
    It seems to solve the problem of infinite energy density at the singularity in any case. I would love to see a way of experimentally verifying this, although most people seem to believe it is wrong. I read the following quote though by Dirac to Pauli "we all agree your idea is crazy, but the real question is it crazy enough to be correct?"
  • H H on 25 Aug 13
     
    As far as I can see, this is not untestable per se, rather an explanation to the redshift that is equivalent to accelerating expansion. It is not that the theory is untestable, rather just another way of looking at it. Kind of like that its sometimes convenient to consider light a particle, sometimes a wave. In the same way it could sometime convenient to view the universe as static with increasing mass instead.
  • Thijs Versloot on 26 Aug 13
     
    Well the premiss "matter getting heavier" may be up to falsification in some way or another. Currently, there is no absolute method to determine mass so it might even be plausible that this is actually the case. I don't think it is related but there is a problem with the 1kg-standards (1 official and 6 copies) where the masses seem to deviate.
  • johannessimon81 on 26 Aug 13
     
    It should not be impossible to verify a change in mass(es) over time. For example the electron cyclotron frequency scales ~e/m while the Hydrogen emission frequencies scale with ~m*e^4. Using multiple relationships like that which can be easily and accurately measured an increase in the mass of fundamental particles should - in principle - be detectable (even if the mass of the earth increases at the same time changing the relativistic reference frame).
  • Thijs Versloot on 26 Aug 13
     
    The Watt balance and a definition using the Planck's constant seems to do the trick and is currently being discussed. Would the electron charge not be problematic as it is related to Coulombs which depends on Amperes which is defined by Newtons which hence depends back on the mass again?
Thijs Versloot

Bacterial growth in space - 0 views

www.sciencedaily.com/...130815105154.htm

Bio technology

shared by Thijs Versloot on 20 Aug 13 - No Cached
  • Thijs Versloot on 20 Aug 13
     
    According to the article it seems that the growth of biofilms in space (MIR, ISS) is continuing to be a challenge for any space missions. Hardly any information is present on what role gravity plays in their growth and development. Maybe detection is also one important aspect of this indeed (Tom?)
johannessimon81

Evidence for High-Energy Extraterrestrial Neutrinos at the IceCube Detector - 1 views

www.sciencemag.org/...1242856

science technology space PHY

shared by johannessimon81 on 22 Nov 13 - No Cached
  • johannessimon81 on 22 Nov 13
     
    IceCube detects a neutrino in about every 6 minutes but most are from within the solar system. A small number of very high energy neutrinos have been found though which have energies that cannot be produced by the sun or on Earth.
Marcus Maertens

Serious gaming meets disruptive innovation - 2 views

www.infopuntveiligheid.nl/Infopuntdocumenten/Serious_gaming_for_behavioural_assessment_and_research_in_case_of_emergency[1].pdf

science

shared by Marcus Maertens on 04 Oct 13 - No Cached
  • Marcus Maertens on 04 Oct 13
     
    Maybe of interest for those into innovative disruption etc? ;)
  • LeopoldS on 05 Oct 13
     
    I could not detect the "disruptive innovation" in the paper
johannessimon81

Weather patterns on Exoplanet detected - 1 views

news.discovery.com/...chance-of-maelstrom-131001.htm

space science

shared by johannessimon81 on 02 Oct 13 - No Cached
  • Thijs Versloot on 02 Oct 13
     
    so it took us 70% of the time Earth is in the habitable zone to develop, would this be normal or could it be much faster? In other words, would all forms of life that started on a planet that originated at a 'similar' point in time like us, be equally far developed?
  • Paul N on 24 Oct 13
     
    That is actually quite tricky to estimate rly. If for no other reason than the fact that all of the mass extinctions we had over the Earth's history basically reset the evolutionary clock. Assuming 2 Earths identical in every way but one did not have the dinosaur wipe-out impact, that would've given non-impact Earth 60million years to evolve a potential dinosaur intelligent super race.
  • johannessimon81 on 25 Oct 13
     
    The opposite might be true - or might not be ;-). Since usually the rate of evolution increases after major extinction events the chance is higher to produce 'intelligent' organisms if these events happen quite frequently. Usually the time of rapid evolution is only a few million years - so Earth is going quite slow. Certainly extinction events don't reset the evolutionary clock - if they would never have happened Earth gene pool would probably be quite primitive. By the way: dinosaurs were a quite diverse group and large dinosaurs might well have had cognitive abilities that come close to whales or primates - the difference to us might be that we have hands to manipulate our environment and vocal cords to communicate in very diverse ways. Modern dinosaur (descendents), i.e. birds, contain some very intelligent species - especially with respect to their body size and weight.
Athanasia Nikolaou

Science on Mars and Mars on Science - 0 views

news.sciencemag.org/...-mars-rover-quest-ancient-life

chemistry geology BIO planetary Mars

shared by Athanasia Nikolaou on 09 Dec 13 - No Cached
  • Athanasia Nikolaou on 09 Dec 13
     
    Some sort of organic carbon has been detected by the sampling of Curiosity; the contamination source was isolated and the signal persists. The scientists suggest as a source meteorites transporting interstellar matter, or maybe some sort of ancient life whose biomass production only survived cosmic radiation as it was buried underground. a big deal: six relevant articles were published simultaneously online: http://www.sciencemag.org/site/extra/curiosity/index.xhtml?utm_content=&utm_medium=Facebook&utm_campaign=Science&utm_source=shortener
Thijs Versloot

Telescope to track space junk using youth radio station - 0 views

www.alphagalileo.org/ViewItem.aspx

shared by Thijs Versloot on 02 Dec 13 - No Cached
  • Thijs Versloot on 02 Dec 13
     
    Team leader Professor Steven Tingay, Director of the MWA at Curtin University and Chief Investigator in the Australian Research Council Centre for All-sky Astrophysics (CAASTRO) said the MWA will be able to detect the space junk by listening in to the radio signals generated by stations including popular youth network Triple J.
Thijs Versloot

Taking the internet underwater - 0 views

phys.org/...13-10-internet-underwater.html

technology

shared by Thijs Versloot on 15 Oct 13 - No Cached
  • Thijs Versloot on 15 Oct 13
     
    University at Buffalo researchers are developing a deep-sea Internet. The technological breakthrough could lead to improvements in tsunami detection, offshore oil and natural gas exploration, surveillance, pollution monitoring...
Thijs Versloot

HealthMap software flagged Ebola 9 days before outbreak announced - 0 views

healthmap.org/ebola

AI health

shared by Thijs Versloot on 11 Aug 14 - No Cached
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  • Thijs Versloot on 11 Aug 14
     
    HealthMap uses algorithms to scour tens of thousands of social media sites, local news, government websites, infectious-disease physicians' social networks and other sources to detect and track disease outbreaks. Sophisticated software filters irrelevant data, classifies the relevant information, identifies diseases and maps their locations with the help of experts.
Thijs Versloot

Final design phase for worlds largest radio telescope #SKA - 0 views

www.skatelescope.org

space science technology

shared by Thijs Versloot on 05 Nov 13 - Cached
  • Thijs Versloot on 05 Nov 13
     
    One of the feats: "The SKA will be so sensitive that it will be able to detect an airport radar on a planet tens of light years away"
Alexander Wittig

Picture This: NVIDIA GPUs Sort Through Tens of Millions of Flickr Photos - 2 views

blogs.nvidia.com/...flickr

AI

shared by Alexander Wittig on 21 Jul 15 - No Cached
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  • Alexander Wittig on 21 Jul 15
     
    Strange and exotic cityscapes. Desolate wilderness areas. Dogs that look like wookies. Flickr, one of the world's largest photo sharing services, sees it all. And, now, Flickr's image recognition technology can categorize more than 11 billion photos like these. And it does it automatically. It's called "Magic View." Magical deep learning! Buzzword attack!
  • ...4 more comments...
  • LeopoldS on 21 Jul 15
     
    and here comes my standard question: how can we use this for space? fast detection of natural disasters onboard?
  • Alexander Wittig on 22 Jul 15
     
    Even on ground. You could for example teach it what nuclear reactors or missiles or other weapons you don't want look like on satellite pictures and automatically scan the world for them (basically replacing intelligence analysts).
  • Alexander Wittig on 23 Jul 15
     
    In fact, I think this could make a nice ACT project: counting seals from satellite imagery is an actual (and quite recent) thing: http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0092613 In this publication they did it manually from a GeoEye 1 b/w image, which sounds quite tedious. Maybe one can train one of those image recognition algorithms to do it automatically. Or maybe it's a bit easier to count larger things, like elephants (also a thing).
  • jcunha on 23 Jul 15
     
    In HiPEAC (High Performance, embedded architecture and computation) conference I attended in the beginning of this year there was a big trend of CUDA GPU vs FPGA for hardware accelerated image processing. Most of it orbitting around discussing who was faster and cheaper with people from NVIDIA in one side and people from Xilinx and Intel in the other. I remember of talking with an IBM scientist working on hardware accelerated data processing working together with the Radio telescope institute in Netherlands about the solution where they working on (GPU CUDA). I gathered that NVIDIA GPU suits best in applications that somehow do not rely in hardware, having the advantage of being programmed in a 'easy' way accessible to a scientist. FPGA's are highly reliable components with the advantage of being available in radhard versions, but requiring specific knowledge of physical circuit design and tailored 'harsh' programming languages. I don't know what is the level of rad hardness in NVIDIA's GPUs... Therefore FPGAs are indeed the standard choice for image processing in space missions (a talk with the microelectronics department guys could expand on this), whereas GPUs are currently used in some ground based (radio astronomy or other types of telescopes). I think that on for a specific purpose as the one you mentioned, this FPGA vs GPU should be assessed first before going further.
  • Paul N on 29 Jul 15
     
    You're forgetting power usage. GPUs need 1000 hamster wheels worth of power while FPGAs can run on a potato. Since space applications are highly power limited, putting any kind of GPU monster in orbit or on a rover is failed idea from the start. Also in FPGAs if a gate burns out from radiation you can just reprogram around it. Looking for seals offline in high res images is indeed definitely a GPU task.... for now.
  • jcunha on 31 Jul 15
     
    The discussion of how to make FPGA hardware acceleration solutions easier to use for the 'layman' is starting btw http://reconfigurablecomputing4themasses.net/.
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