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LeopoldS

European Health Levels Suddenly Collapsed After 2003 And Nobody is Sure Why - The Physi... - 1 views

medium.com/...3664ec51205c

data statistics

shared by LeopoldS on 27 Nov 13 - No Cached
  • LeopoldS on 27 Nov 13
     
    interesting stats ...still living longer but enjoying it less?
Athanasia Nikolaou

Nature Paper: Rivers and streams release more CO2 than previously believed - 6 views

www.klimacampus.de/631+M59214efc590.html

climate emissions

shared by Athanasia Nikolaou on 25 Nov 13 - No Cached
LeopoldS liked it
  • Athanasia Nikolaou on 25 Nov 13
     
    Another underestimated source of CO2, are turbulent waters. "The stronger the turbulences at the water's surface, the more CO2 is released into the atmosphere. The combination of maps and data revealed that, while the CO2 emissions from lakes and reservoirs are lower than assumed, those from rivers and streams are three times as high as previously believed." Alltogether the emitted CO2 equates to roughly one-fifth of the emissions caused by humans. Yet more stuff to model...
  • ...10 more comments...
  • Dario Izzo on 26 Nov 13
     
    This could also be a mechanism to counter human CO2 emission ... the more we emit, the less turbulent rivers and stream, the less CO2 is emitted there ... makes sense?
  • johannessimon81 on 27 Nov 13
     
    I guess there is a natural equilibrium there. Once the climate warms up enough for all rivers and streams to evaporate they will not contribute CO2 anymore - which stops their contribution to global warming. So the problem is also the solution (as always).
  • Athanasia Nikolaou on 27 Nov 13
     
    "The source of inland water CO2 is still not known with certainty and new studies are needed to research the mechanisms controlling CO2 evasion globally." It is another source of CO2 this one, and the turbulence in the rivers is independent of our emissions in CO2 and just facilitates the process of releasing CO2 waters. Dario, if I understood correct you have in mind a finite quantity of CO2 that the atmosphere can accomodate, and to my knowledge this does not happen, so I cannot find a relevant feedback there. Johannes, H2O is a powerful greenhouse gas :-)
  • Dario Izzo on 27 Nov 13
     
    Nasia I think you did not get my point (a joke, really, that Johannes continued) .... by emitting more CO2 we warm up the planet thus drying up rivers and lakes which will, in turn emit less CO2 :) No finite quantity of CO2 in the atmosphere is needed to close this loop ... ... as for the H2O it could just go into non turbulent waters rather than staying into the atmosphere ...
  • Athanasia Nikolaou on 03 Dec 13
     
    Really awkward joke explanation: I got the joke of Johannes, but maybe you did not get mine: by warming up the planet to get rid of the rivers and their problems, the water of the rivers will be accomodated in the atmosphere, therefore, the greenhouse gas of water.
  • Dario Izzo on 03 Dec 13
     
    from my previous post: "... as for the H2O it could just go into non turbulent waters rather than staying into the atmosphere ..."
  • johannessimon81 on 03 Dec 13
     
    I guess the emphasis is on "could"... ;-) Also, everybody knows that rain is cold - so more water in the atmosphere makes the climate colder.
  • LeopoldS on 03 Dec 13
     
    do you have the nature paper also? looks like very nice, meticulous typically german research lasting over 10 years with painstakingly many researchers from all over the world involved .... and while important the total is still only 20% of human emissions ... so a variation in it does not seem to change the overall picture
  • Athanasia Nikolaou on 04 Dec 13
     
    here is the nature paper : http://www.nature.com/nature/journal/v503/n7476/full/nature12760.html I appreciate Johannes' and Dario's jokes, since climate is the common ground that all of us can have an opinion, taking honours from experiencing weather. But, the same as if I am trying to make jokes for material science, or A.I. I take a high risk of failing(!) :-S Water is a greenhouse gas, rain rather releases latent heat to the environment in order to be formed, Johannes, nice trolling effort ;-) Between this and the next jokes to come, I would stop to take a look here, provided you have 10 minutes: how/where rain forms http://www.scribd.com/doc/58033704/Tephigrams-for-Dummies
  • Dario Izzo on 04 Dec 13
     
    omg
  • johannessimon81 on 09 Dec 13
     
    Nasia, I thought about your statement carefully - and I cannot agree with you. Water is not a greenhouse gas. It is instead a liquid. Also, I can't believe you keep feeding the troll! :-P But on a more topical note: I think it is an over-simplification to call water a greenhouse gas - water is one of the most important mechanisms in the way Earth handles heat input from the sun. The latent heat that you mention actually cools Earth: solar energy that would otherwise heat Earth's surface is ABSORBED as latent heat by water which consequently evaporates - the same water condenses into rain drops at high altitudes and releases this stored heat. In effect the water cycle is a mechanism of heat transport from low altitude to high altitude where the chance of infrared radiation escaping into space is much higher due to the much thinner layer of atmosphere above (including the smaller abundance of greenhouse gasses). Also, as I know you are well aware, the cloud cover that results from water condensation in the troposphere dramatically increases albedo which has a cooling effect on climate. Furthermore the heat capacity of wet air ("humid heat") is much larger than that of dry air - so any advective heat transfer due to air currents is more efficient in wet air - transporting heat from warm areas to a natural heat sink e.g. polar regions. Of course there are also climate heating effects of water like the absorption of IR radiation. But I stand by my statement (as defended in the above) that rain cools the atmosphere. Oh and also some nice reading material on the complexities related to climate feedback due to sea surface temperature: http://journals.ametsoc.org/doi/abs/10.1175/1520-0442(1993)006%3C2049%3ALSEOTR%3E2.0.CO%3B2
  • Athanasia Nikolaou on 10 Dec 13
     
    I enjoy trolling conversations when there is a gain for both sides at the end :-) . I had to check upon some of the facts in order to explain my self properly. The IPCC report states the greenhouse gases here, and water vapour is included: http://www.ipcc.ch/publications_and_data/ar4/wg1/en/faq-2-1.html Honestly, I read only the abstract of the article you posted, which is a very interesting hypothesis on the mechanism of regulating sea surface temperature, but it is very localized to the tropics (vivid convection, storms) a region of which I have very little expertise, and is difficult to study because it has non-hydrostatic dynamics. The only thing I can comment there is that the authors define constant relative humidity for the bottom layer, supplied by the oceanic surface, which limits the implementation of the concept on other earth regions. Also, we may confuse during the conversation the greenhouse gas with the Radiative Forcing of each greenhouse gas: I see your point of the latent heat trapped in the water vapour, and I agree, but the effect of the water is that it traps even as latent heat an amount of LR that would otherwise escape back to space. That is the greenhouse gas identity and an image to see the absorption bands in the atmosphere and how important the water is, without vain authority-based arguments that miss the explanation in the end: http://www.google.nl/imgres?imgurl=http://www.solarchords.com/uploaded/82/87-33833-450015_44absorbspec.gif&imgrefurl=http://www.solarchords.com/agw-science/4/greenhouse--1-radiation/33784/&h=468&w=458&sz=28&tbnid=x2NtfKh5OPM7lM:&tbnh=98&tbnw=96&zoom=1&usg=__KldteWbV19nVPbbsC4jsOgzCK6E=&docid=cMRZ9f22jbtYPM&sa=X&ei=SwynUq2TMqiS0QXVq4C4Aw&ved=0CDkQ9QEwAw
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."
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

Dolphin inspired radar #biomimicry - 2 views

phys.org/...-10-dolphins-radar-device.html

tech bio radar

shared by Thijs Versloot on 23 Oct 13 - No Cached
  • Thijs Versloot on 23 Oct 13
     
    The device, like dolphins, sends out two pulses in quick succession to allow for a targeted search for semiconductor devices, cancelling any background "noise",
  • ...1 more comment...
  • Athanasia Nikolaou on 30 Oct 13
     
    and it sends out two pulses of opposite polarity, in succession, such that a semiconductor changes the negative to a positive one, amplifying the returning signal. Very interesting. Maybe we can combine different frequencies for identifying a single variable in earth observation. We already use more that one frequencies but for identifying one variable each.
  • Thijs Versloot on 31 Oct 13
     
    Could it be used to measure ocean acidification? I found a study that links sound wave propagation with ocean acidity. Maybe we are able to do such measurement from space even? "Their paper, "Unanticipated consequences of ocean acidification: A noisier ocean at lower pH," published last week in the journal Geophysical Research Letters, found that fossil fuels are turning up the ocean's volume. Since the beginning of the Industrial Revolution, the overall pH of the world's oceans has dropped by about 0.1 units, with more of the changes concentrated closer to the poles. The authors found that sound absorption has decreased by 15 percent in parts of the North Atlantic and by 10 percent throughout the Atlantic and Pacific"
  • Athanasia Nikolaou on 31 Oct 13
     
    The last time I asked an oceanographer for the use of acoustic waves, she said it is still a bit problematic method to take into account its data, but we were referring to measuring ocean circulation. It may be more conclusive for PH measurements, though. The truth is that there is a whole underwater network with pulse emmitters/receivers covering the North Atlantic basin, remnant infrastructure for spying activities in the WW2 and in the cold war, that stays unexploited. We should look more into this idea
Thijs Versloot

Engineers identify how to keep surfaces dry underwater - 1 views

phys.org/...15-08-surfaces-underwater.html

technology

shared by Thijs Versloot on 24 Aug 15 - No Cached
johannessimon81 and jcunha liked it
  • Thijs Versloot on 24 Aug 15
     
    When submerged, water tends to cling to the top of the spikes, while air and water vapor accrue in the pores between them. The combination of trapped air and water vapor within these cavities forms a gaseous layer that deters moisture from seeping into the surface below. More materials with amazing properties. Might even be usefull for liquid fuel tanks?
  • johannessimon81 on 01 Sep 15
     
    I don't quite see how the trapped water vapor keeps the water out of the cavities... since the vapor is at the same low temperature as the water it should hardly exert any pressure at all. One would expect though that surface tension keeps water out of smaller cavities because it tries to minimize surface area. If the water would enter the cavities it would need increase its surface area dramatically which in turn is energetically unfavorable. Interesting application would also be in non-wetting electronics which might make cooling of circuitry a lot easier: you just sink your data center.
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/.
Luís F. Simões

Encryption's holy grail is getting closer, one way or another | ZDNet - 0 views

www.zdnet.com/...ting-closer-one-way-or-another

INF cryptography

shared by Luís F. Simões on 06 Jul 15 - No Cached
  • Working with encrypted data without decrypting it first sounds too good to be true, but it's becoming possible.
  • Luís F. Simões on 06 Jul 15
     
    an update on homomorphic encryption research and applications
Paul N

TED-RNN - Machine generated TED-Talks - 2 views

www.youtube.com/watch

shared by Paul N on 25 Jun 15 - No Cached
alekenolte liked it
  • Paul N on 25 Jun 15
     
    TED talks are so random even recurrent neural networks can do it
  • Luís F. Simões on 25 Jun 15
     
    :D this is so good !!
  • alekenolte on 26 Jun 15
     
    my favourite sentence: "or to be able to solve the data in an astronaut a spider"
Nina Nadine Ridder

Wild Cape York and glittering reef - 1 views

www.abc.net.au/...4253295.htm

Earth_observation climate_change corals marine_biology

shared by Nina Nadine Ridder on 02 Sep 15 - No Cached
  • Nina Nadine Ridder on 02 Sep 15
     
    Really interesting bit hidden in the last paragraph: Monitoring coral bleaching from space with Envisat penetrating down to a depth of 10 m "[...] Envisat's Medium Resolution Imaging Spectrometer sensor can detect coral bleaching down to depths of ten metres, meaning Envisat could potentially map coral bleaching on a global scale."
  • Ma Ru on 15 Sep 15
     
    No, it can't :-) Since 8 April 2012 Envisat is a proud holder of the title of one of the biggest pieces of space junk out there in LEO...
  • Nina Nadine Ridder on 17 Sep 15
     
    admittedly correct, so the past tense would have been a more appropriate choice... Nevertheless, plenty of data to look back at and Sentinel-3 will launch eventually! ;)
jcunha

Introducing A Brain-inspired Computer [IBM TrueNorth] - 0 views

www.research.ibm.com/...brain-chip.shtml

technology science BIO PHY AI NAN

shared by jcunha on 20 Aug 15 - No Cached
LeopoldS liked it
  • jcunha on 20 Aug 15
     
    Built in Silicon technology (Samsung's 28 nm process), its power is measured as one million neurons and 256 million synapses. It contains 5.4 million transistor being the largest IBM chip in these terms. All this said, it consumes less than 100 mW!! "These systems can efficiently process high-dimensional, noisy sensory data in real time, while consuming orders of magnitude less power than conventional computer architectures." IBM is working with initLabs to integrate the DVS retinal camera with these chips = real time image neuro-like image processing. In what seems to be a very successful project hugely funded by DARPA, "Our sights are now set high on the ambitious goal of integrating 4,096 chips in a single rack with 4 billion neurons and 1 trillion synapses while consuming ~4kW of power."
jcunha

scrible | smarter online research - annotate, organize & collaborate on web pages - 2 views

www.scrible.com

research Googling website organization

shared by jcunha on 31 Jul 15 - Cached
  • jcunha on 31 Jul 15
     
    A personal need for organizing the information I access online, going away from the pdf print of page, or browser tab just lying open for ages (Anna style) brought me here. Seems to be a quite good and featureful service, sponsored by the NSF.
  • LeopoldS on 14 Sep 15
     
    not convinced ... still stick to pdf for time being
  • Paul N on 16 Sep 15
     
    NSF, NSA, more or less the same. I'm growing increasingly weary about giving increasingly more private data away to online services.
Ma Ru

Command line tools for the Google Data APIs - 2 views

code.google.com/googlecl

INF command line fun Web 2.0

shared by Ma Ru on 20 Jun 10 - Cached
  • Ma Ru on 20 Jun 10
     
    I'm sure Francesco will love it... perhaps of use for ACT's Google calendar/docs?
  • LeopoldS on 21 Jun 10
     
    is there an easy way (easy for Francesco I mean) to retrieve the citation number of papers in google scholar automatically (e.g. for act papers)?
  • Francesco Biscani on 13 Jul 10
     
    It seems like google scholar is not supported yet.
Juxi Leitner

cubesat-space-protocol - Project Hosting on Google Code - 2 views

code.google.com/...cubesat-space-protocol

cubesat protocol data transfer api communication

shared by Juxi Leitner on 02 Jun 10 - Cached
  • Juxi Leitner on 02 Jun 10
     
    possible a simpler solution for simple spacecraft fractionation
pacome delva

Radiation fears stalk stellar mission - 0 views

physicsworld.com/...43063

space_mission GAIA solar_radiation

shared by pacome delva on 05 Jul 10 - Cached
  • Concern over ESA's handling of the radiation issue caused Michael Perryman, former GAIA project scientist, to resign from the agency in 2008. But GAIA science-team member Lennart Lindegren, an astronomer at Lund Observatory in Sweden, is confident that GAIA's unprecedented accuracy will be feasible. GAIA researchers will continue to perform tests and calibrations until at least 2011, which will include irradiating the CCDs at space-like temperatures. Lindegren admits, however, that they can never be certain of success until the spacecraft is in orbit and starts sending back data.
  • pacome delva on 05 Jul 10
     
    metamaterials to stop radiations?
  • LeopoldS on 05 Jul 10
     
    hmm ... in the optical range it is already a bit tricky .... lets brainstorm a bit about it ... anything in the literature? Luzi?
  • pacome delva on 06 Jul 10
     
    the components of the metamaterial need to have a size inversely proportional to the wavelenght, but here we are talking about high energy protons. So the idea was: is there metamaterials that change the electrical properties to solve this problem of holes in the material... but i dont have a clue !
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.
Joris _

Astrium To Manage Atomic Clock Demo on Station | SpaceNews.com - 1 views

www.spacenews.com/...atomic-clock-demo-station.html

atomic clock

shared by Joris _ on 20 Jul 10 - Cached
pacome delva liked it
  • pacome delva on 21 Jul 10
     
    cool! i will be working on the link and the data!
Joris _

File-Sharing Group Mulls a Floating Pirate Ship of Servers in the Sky | Popular Science - 1 views

www.popsci.com/...oating-pirate-ship-servers-sky

shared by Joris _ on 25 Oct 10 - No Cached
  • The problem: Where can servers that store data frequently seen as unsavory be kept? The solution: Hanging from a giant balloon in the sky?
  • this idea isn't totally practical, since the group has limited resources and an airborne server presents a whole host of problems
  • ther suggestions included a low-level satellite
  • Joris _ on 25 Oct 10
     
    outcome of a brainstorming, or an example of thinking out of the box ... :)
  • LeopoldS on 25 Oct 10
     
    should we try to help them :-) ?
  • Joris _ on 25 Oct 10
     
    we should propose fractionned servers with CubeSats ...
Ma Ru

Train Like an Astronaut ESA Initiative - 2 views

www.trainlikeanastronaut.org/...mission-data

space fun fitness education

shared by Ma Ru on 21 Oct 10 - No Cached
  • Ma Ru on 21 Oct 10
     
    You know what to do...
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