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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
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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
annaheffernan liked it
  • 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.
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Optimal Control Probem in the CR3BP solved!!! - 7 views

math.u-bourgogne.fr/...research OCP CR3BP trajectory MAD
shared by Dario Izzo on 07 Jun 11 - No Cached
  • Dario Izzo on 07 Jun 11
     
    This guy solved a problem many people are trying to solve!!! The optimal control problem for the three body problem (restricted, circular) can be solved using continuation of the secondary gravity parameter and some clever adaptation of the boundary conditions!! His presentation was an eye opener ... making the work of many pretty useless now :)
  • ...13 more comments...
  • Ma Ru on 08 Jun 11
     
    Riemann hypothesis should be next... Which paper on the linked website is this exactly?
  • Joris _ on 08 Jun 11
     
    hmmm, last year at the AIAA conference in Toronto I presented a continuation approach to design a DRO (three-body problem). Nothing new here unfortunately. I know the work of Caillau, although interesting what is presented was solved 10 years ago by others. The interest of his work is not in the applications (CR3BP), but in the research of particular regularity conditions that unfortunately make the problem limited practically. Look also at the work of Mingotti, Russel, Topputo and other for the (C)RTBP. Smart-One inspired a bunch of researchers :)
  • Dario Izzo on 08 Jun 11
     
    Topputo and some of the others 'inspired' researchers you mention are actually here at the conference and they are all quite depressed :) Caillau really solves the problem: as a one single phase transfer, no tricks, no misconvergence, in general and using none of the usual cheats. What was produced so far by other were only local solutions valid for the particular case considered. In any case I will give him your paper, so that he knows he is working on already solved stuff :)
  • Dario Izzo on 08 Jun 11
     
    Answer to Marek: the paper you may look at is: Discrete and differential homotopy in circular restricted three-body control
  • Joris _ on 08 Jun 11
     
    Ah! with one single phase and a first order method then it is amazing (but it is still just the very particular CRTBP case). The trick is however the homotopy map he selected! Why this one? Any conjugate point? Did I misunderstood the title ? I solved in one phase with second order methods for the less restrictive problem RTBP or simply 3-body... but as a strict answer to your title the problem has been solved before. Nota: In "Russell, R. P., "Primer Vector Theory Applied to Global Low-Thrust Trade Studies," JGCD, Vol. 30, No. 2", he does solve the RTBP with a first order method in one phase.
  • Joris _ on 08 Jun 11
     
    I think what is interesting is not what he solved, but how he solved the problem. But, are means more important than end ... I dunno
  • Dario Izzo on 08 Jun 11
     
    I also loved his method, and it looked to me that is far more general than the CRTBP. As for the title of this post, OK maybe it is an exageration as it suggests that no solution was ever given before, on the other end, as Marek would say "come on guys!!!!!"
  • Joris _ on 09 Jun 11
     
    The generality has to be checked. Don't you think his choice of mapping is too specific? he doesn't really demonstrate it works better than other. In addition, the minimum time choice make the problem very regular (i guess you've experienced that solving min time is much easier than mass max, optimality-wise). There is still a long way before maximum mass+RTBP, Topputo et al should be re-assured :p Did you give him my paper, he may find it interesting since I mention the homotopy on mu but for max mass:)
  • Dario Izzo on 09 Jun 11
     
    Joris, that is the point I was excited abut, at the conference HE DID present solutions to the maximum mass problem!! One phase, from LEO to an orbit around the moon .. amazing :) You will find his presentation on line.... (according to the organizers) I gave him the reference to you paper anyway, but no pdf though as you did not upload it on our web pages and I could not find it in the web. So I gave him some bibliography I had with be from the russians, and from Russell, Petropoulos and Howell, As far as I know these are the only ones that can hope to compete with this guy!!
  • Joris _ on 09 Jun 11
     
    for info only, my phd, in one phase: http://pdf.aiaa.org/preview/CDReadyMAST08_1856/PV2008_7363.pdf I prefered Mars than the dead rock Moon though!
  • Dario Izzo on 09 Jun 11
     
    If you send me the pdf I can give it to the guy .. the link you gave contains only the first page ... (I have no access till monday to the AIAA thingy)
  • LeopoldS on 11 Jun 11
     
    this is why I like this Diigo thingy so much more than delicious ...
  • tvinko on 17 Jun 11
     
    What do you mean by this comment, Leopold? ;-) Jokes apart: I am following the Diigo thingy with Google Reader (rss). Obviously, I am getting the new postings. But if someone later on adds a comment to a post, then I can miss it, because the rss doesn't get updated. Not that it's a big problem, but do you guys have a better solution for this? How are you following these comments? (I know that if you have commented an entry, then you get the later updates in email.) (For example, in google reader I can see only the first 5 comments in this entry.)
  • LeopoldS on 18 Jun 11
     
    I like when there are discussions evolving around entries
  • LeopoldS on 18 Jun 11
     
    and on your problem with the RSS Tamas: its the same for me, you get the comments only for entries that you have posted or that you have commented on ...
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iRobot Brings Visual Mapping and Navigation to the Roomba 980 - 1 views

spectrum.ieee.org/...d-navigation-to-the-roomba-980
shared by Alexander Wittig on 18 Sep 15 - No Cached
  • Alexander Wittig on 18 Sep 15
     
    Finally the thing will have a little more artificial intelligence than just "bump into wall, turn a bit, repeat". We've known for a while now that iRobot has been developing robots with wireless integration along with intelligent navigation capability based on VSLAM (Vision Simultaneous Localization and Mapping). We've know this for enough of a while that it's been a little bit frustrating to see iRobot's most recent Roomba upgrades come out without those neat features.
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Smart grids - The IET - 0 views

www.theiet.org/...smartgrids.cfm smart_grids sustainable_energy talk
shared by Nina Nadine Ridder on 25 Aug 10 - Cached
  • Nina Nadine Ridder on 25 Aug 10
     
    talk about European Technology Platform SmartGrids in Paris on the 7th Sep, 19h
  • Nina Nadine Ridder on 25 Aug 10
     
    in case somebody is in Paris on the 7th Sep. - sounds quite interesting
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File Compression: New Tool for Life Detection? - 4 views

www.astrobio.net/...on-new-tool-for-life-detection life AI image compression
shared by Dario Izzo on 21 Sep 10 - No Cached
  • Dario Izzo on 21 Sep 10
     
    As mentioned today during coffee .... we could think to link this to source localization
  • ...3 more comments...
  • Ma Ru on 22 Sep 10
     
    Not sure by what you mean by source localisation, but this using gzip to discern "biological" from "non-biological" images seems to me *very* tricky... I mean, there's a lot of other factors that may affect compressibility of an image than just mere "regularity" of the pattern, and if they haven't controlled for these, this is just bullsh1t... (For instance did they use the same imaging device to take those images? What about lighting conditions and exposure? etc). The apostle of sometimes surprising uses of compression is prof. Shmidhuber from IDSIA...
  • Dario Izzo on 22 Sep 10
     
    I completely agree with you..... still if you have one instrument on board the spacecraft and your picture compressibility is a noisy indicator of some interesting source .... we could try to perform some probabilistic reasoning
  • Juxi Leitner on 24 Sep 10
     
    I think they (IDSIA-Schmidhuber) are planning on putting something about that also inside the Acta Futura paper...
  • Ma Ru on 24 Sep 10
     
    Really, you think they'd target such a low impact factor publication? ;-P
  • Dario Izzo on 26 Sep 10
     
    you will all soon be begging to publish in Acta Futura! We will be bigger than Nature.
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Phys. Rev. Lett. 89, 210401 (2002): Locality and Topology in the Molecular Aharonov-Boh... - 2 views

prl.aps.org/...e210401
shared by duncan barker on 01 Nov 10 - No Cached
  • Luzi Bergamin on 01 Nov 10
     
    If it's neither topological nor nonlocal, why on Earth is it then called Aharonov-Bohm effect?
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Violation of local realism with freedom of choice - PNAS - 4 views

www.pnas.org/...1002780107 science PHY space
shared by LeopoldS on 01 Nov 10 - No Cached
  • LeopoldS on 01 Nov 10
     
    another Zeilinger experiment ...
  • Luzi Bergamin on 02 Nov 10
     
    And what if the freedom-of-choice is corrupted due to yet another hidden variable in past lightcone of the whole experiment that triggers Alice and Bob's choice as well as the pair creation? Then we can design yet another experiment that will have yet another loophole. I guess this is experimentally interesting work, but the introduction rather reads like an article from the "Institut für Grenzgebiete der Psychologie und Psychohygiene"...
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Better Nanotubes May Be on the Way -- Fox 2009 (1210): 3 -- ScienceNOW - 1 views

sciencenow.sciencemag.org/...3 phy nan carbon_nanotubes
shared by pacome delva on 14 Dec 09 - Cached
  • Success at building large amounts of inexpensive nanotubes opens the door for lighter, faster car frames; affordable space vehicles; and ultralightweight armor. Or on a smaller level, BNNTs could be used with pinpoint precision to attack cancer cells by sticking to tumors, absorbing neutrons from a targeted beam, and generating localized alpha radiation to kill the cancer. "This is the start of a revolution in materials," says Dennis Bushnell, a NASA engineer who has watched the work closely in the hopes of using BNNTs for space vehicles.
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On whether to re-brand space junk as "historical heritage"... - 3 views

www.latimes.com/...nk29-2010jan29,0,5698181.story
shared by Eduardo Martin Moraud on 29 Jan 10 - Cached
LeopoldS liked it
  • Eduardo Martin Moraud on 29 Jan 10
     
    For those working on space debris removal... Watch out for moon-protection activists that will accuse you of distroying a historical heritage: "There are countless places on Earth that have been awarded protection to preserve their historic or cultural importance. The moon has none. But that may be about to change...."
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Some *real* crowdsourcing by NASA - 1 views

www.planethunters.org space planet crowdsourcing NASA exoplanets software
shared by Ma Ru on 18 Dec 10 - No Cached
LeopoldS liked it
  • Ma Ru on 18 Dec 10
     
    For the time being the page does not load for me (overload?) but I've just read an article about it in the local news.
  • LeopoldS on 19 Dec 10
     
    loads fine for me ... and very nice layout - well done in general in my view
  • LeopoldS on 19 Dec 10
     
    This Zooniverse looks nice in general ... look also at the other projects: http://www.zooniverse.org/contact
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Three-Dimensional Invisibility Cloak at Optical Wavelengths - 4 views

www.sciencemag.org/...337.abstract technology phy science nan
shared by LeopoldS on 16 May 11 - No Cached
  • LeopoldS on 16 May 11
     
    more transformation optics ... 
  • dejanpetkow on 17 May 11
     
    I still believe that it is worth to check the thermal, mechanical and chemical properties of the developed metamaterials. For hyperbolic re-entries the radiation is still the dominating heat load source and a dominating bandwith may be indentified. A resistive metamaterial should be placed on the nose cap of the entry body in order to reduce local radiation heat load.
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T-Mobile Sidekick Disaster: Danger's Servers Crashed, And They Don't Have A Backup - 0 views

www.techcrunch.com/...ed-and-they-dont-have-a-backup inf cloud computing fun
shared by Francesco Biscani on 11 Oct 09 - Cached
  • The fact that T-Mobile and/or Microsoft Danger don’t have a redundant backup is simply inexcusable, especially given the fact that the Sidekick is totally reliant on the cloud because it doesn’t store its data locally.
  • Francesco Biscani on 11 Oct 09
     
    Some foreseen dangers of cloud computing become reality...
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Physicists Propose Scheme for Teleporting Light Beams - 0 views

www.physorg.com/news166779852.html PHY
shared by Joris _ on 15 Jul 09 - Cached
  • it’s possible that a physical object (e.g. a quantum field) in one location could emerge at another location in the same quantum state
  • pacome delva on 16 Jul 09
     
    have to be carefull this article is really badly written. Teleportation is not some matter that disapear from somewhere to reappear somewhere else... Usually we talk about entangled particles (by essence quantum theory is non-local), and teleportation means that if you force (with a measurement) one particle to take a particular quantum state then the other one will have the same quantum state. There it seems that the same could be done with a quantum field, which is the second quantization of the quantum theory: the state of a quantum field can contain a mixture of n-particles states (meaning that the number of particles is not defined, only the mean value). If you measure the number of particle then you force the quantum field to "choose" a particular quantum state (which can be the vacuum). Teleportation means that you will have exactly the same measure on another quantum field, which is somehow intricated to your first one.
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Metaheuristic / Stochastic Local Search Forum - 0 views

landau.ulb.ac.be/sls-forum INF AI metaheuristic stochastic optimization forum
shared by ESA ACT on 24 Apr 09 - No Cached
  • ESA ACT on 24 Apr 09
     
    The ambition of this forum is to create a network, from where ideas and insights can be shared and projects/collaboration can be raised.
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BrowserPlus™ (a technique that seems to bridge webbrowsers with local desktop... - 0 views

browserplus.yahoo.com INF internet browser web
shared by ESA ACT on 24 Apr 09 - Cached
  • ESA ACT on 24 Apr 09
     
    looks actually quite interesting to me - could we use it?
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esp@cenet - Home page - 0 views

ep.espacenet.com/?locale=en_EP patents searchengine
shared by ESA ACT on 24 Apr 09 - Cached
  • ESA ACT on 24 Apr 09
     
    Patent search engine from EPO
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Secrets of a mollusk's unique bioceramic armor - 1 views

www.sciencedaily.com/...140330151537.htm BIO technology optical ceramic
shared by Thijs Versloot on 31 Mar 14 - No Cached
  • Thijs Versloot on 31 Mar 14
     
    The secrets behind a marine creature's defensive armor -- one that is exceptionally tough, yet optically clear -- have been revealed by scientists. The shells' unique properties emerge from a specialized nanostructure that allows optical clarity, as well as efficient energy dissipation and the ability to localize deformation, the researchers found.
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NeuroNex - Odor2Action - 0 views

www.odor2action.org biomimetics chemoreception neuroscience olfactory BIO odor localization
shared by marenr on 05 Jan 21 - No Cached
  • marenr on 05 Jan 21
     
    Let's keep a eye on this... Animals use odor cues to navigate through their environments, helping them locate targets and assess danger. Much of how animal brains organize, read out, and respond to odor stimuli across spatial and temporal scales is not well understood. To tackle these questions, Odor2Action uses a highly interdisciplinary team science approach. Our work uses fruit fly, honeybee, and mouse models to determine how neural representations of odor are generated, reformatted, and translated to generate useful behaviors that guide how animals interact with their environment.
  • LeopoldS on 07 Jan 21
     
    reminds me of the methan smelling source finding study we did ...
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