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jcunha

'Disruptive' science has declined - 2 views

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    About "Papers and patents are becoming less disruptive over time" https://www.nature.com/articles/s41586-022-05543-x. "Overall, our results deepen understanding of the evolution of knowledge and may guide career planning and science policy. To promote disruptive science and technology, scholars may be encouraged to read widely and given time to keep up with the rapidly expanding knowledge frontier. Universities may forgo the focus on quantity, and more strongly reward research quality56, and perhaps more fully subsidize year-long sabbaticals. Federal agencies may invest in the riskier and longer-term individual awards that support careers and not simply specific projects57, giving scholars the gift of time needed to step outside the fray, inoculate themselves from the publish or perish culture, and produce truly consequential work. Understanding the decline in disruptive science and technology more fully permits a much-needed rethinking of strategies for organizing the production of science and technology in the future."
Annalisa Riccardi

The Computer That Stores and Processes Information At the Same Time | MIT Technology Re... - 3 views

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    The human brain both stores and processes information at the same time. Now computer scientists say they can do the same thing The human brain is an extraordinary computing machine. Nobody understands exactly how it works its magic but part of the trick is the ability to store and process information at the same time.
johannessimon81

In super-earths magnesium oxide may be metallic and sustain magnetic fields... - 1 views

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    The mantles of Earth and other rocky planets are rich in magnesium and oxygen. Due to its simplicity, the mineral magnesium oxide is a good model for studying the nature of planetary interiors. New work studied how magnesium oxide behaves under the extreme conditions deep within planets and found evidence that alters our understanding of planetary evolution.
Chritos Vezyri

NASA's basement nuclear reactor - 2 views

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    So they think they found a way for beta decay to produce both lighter (Ni->Cu) AND heavier (C->N) nuclei? ...
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    just another attempt to revive cold fusion from the dead ... and all with dubious experimental setups; read the last phrase ""From my perspective, this is still a physics experiment," Zawodny said. "I'm interested in understanding whether the phenomenon is real, what it's all about. Then the next step is to develop the rules for engineering. Once you have that, I'm going to let the engineers have all the fun." He went on to say that, " All we really need is that one bit of irrefutable, reproducible proof that we have a system that works. As soon as you have that, everybody is going to throw their assets at it. And then I want to buy one of these things and put it in my house."
Dario Izzo

Comparing the C++ Standard and Boost - 3 views

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    any thoughts?
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    I don't understand what kind of point the author is trying to make. Boost is not an STL implementation (and you can't actually use Boost if you don't have an underlying STL). So again, what's the conclusion?
johannessimon81

ESA article on magnetic reconnection, related: solar flares, earth magnetic field jets,... - 0 views

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    ESA Science & Technology: A leap forward in probing magnetic reconnection in space: Magnetic reconnection is a fundamental physical process in the Universe, playing a major role in various phenomena such as star formation or solar explosions, but also preventing plasma confinement in fusion reactors on Earth. However, a lack of precise measurements at the heart of this physical process prevents a full understanding of this phenomenon.
Marcus Maertens

Pouring Milk All Over Yourself: The Next Extremely Bizarre Trend? - 1 views

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    So... who is in?
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    I thought you were supposed to do this with petrol... |:-[ It's by the way cool to see how the milk seems to flow very differently from what one might expect from water: it seems to flow in a few thick streams instead of wetting the whole person... Since the surface tension of milk seems to be lower than that of water (http://journals.cambridge.org/action/displayAbstract;jsessionid=908B02C3825E97162B9D60DA615EAC96.journals?fromPage=online&aid=5146540) this is surprising. It might very well be an effect of the colloidal nature of milk as it is water in which semi-solid fat particles are suspended. So like the cornstarch mix that we have seen in the office there might be some dynamic jamming going on leading to a higher viscosity (at high shear rates). After all they might be doing science...
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    nice comment Johannes ... if you add a bit of Kleopatre, e.g. why bathing in milk helped her fool Marcus Antonius, your comment would be fully interdisciplinary :-)
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    you mean it would include History or Psychology? I would understand why Marcus Antonius might get fooled by a bathing beauty - but milk? DONKEY MILK?!? That's just wrong... :-[
LeopoldS

Meteorite Crashes In Russia, Panic Spreads (Updating) - 5 views

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    Latest update: the European Space Agency says their experts "confirm there is no link between the meteor incidents in Russia and asteroid 2012DA14 flyby tonight". How did they find this? As they did not see this one coming, how could they come to that conclusion that early!
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    As you can see from the videos of this meteorite it is coming in from an east to south-east direction (i.e. the direction of the sunrise, more or less). 2012DA14 is coming from due south as you can see here: http://www.wired.com/wiredscience/2013/02/how-to-watch-asteroid-2012-da14/ So the two objects seem to be coming from different directions - at least that would be my explanation.
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    My point is, that if you want to come to such a conclusion (that it is not rubble) you need to be able to construct back the orbits of both objects. 2012DA14 has been observed for one year only, but it is well enough. When the meteor has been observed for the first time, such that we knew its orbit? has it been observed before? if yes, why the impact has not been predicted?
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    If you can show that they come from different directions you know that they are not associated, even if you don't reconstruct their orbits.
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    I don't think so. If both objects were part of the same, they would be on different but intersecting orbits anyway, hence different directions. Anyway, I am not knowledgeable in atmospheric entry ... But, with so few information about the object, I am surprised they are 100% certain it is not related to DA14. I think science requires more cautions ... With only the direction they are 100% sure, while the probability of such event is itself extremely small, I am amazed... They can't even predict with 100% certainty where a space debris will fall... plus, nobody consider the object being part of a bigger one that broke up during early entry (which has not been observed) ... so many uncertainties and possible hypothesis... and i am not the only one :) http://www.infowars.com/russian-meteor-linked-to-da14-asteroid/
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    was not that evident to me also but apparently with the right understanding it was quite clear; was amazed also how quickly NASA has published the likely trajectory of the russian object - have a look at it: quite evident that these are not coming from the same body
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    yes, now i get my 100% certainty with the reconstructed orbits nothing else (http://wiki.nasa.gov/cm/blog/Watch%20the%20Skies/posts/post_1361037562855.html) ... I still think that esa anouncemement was highly premature but with a high probability of being right...
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    Some more results on the topic (link to an arxiv article inside): http://www.bbc.co.uk/news/science-environment-21579422
jcunha

IBM Watson: The inside story of how the Jeopardy-winning supercomputer was born, and wh... - 0 views

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    A nice read. IBM Watson wowed the tech industry with a 2011 win against two of television show Jeopardy greatest champions. Using something that seemed like a sort of tree search for me IBM DeepQA algorithm managed to ingest sparse data (clues), process it getting one answer, understand what that answer means and come up with the question that leads to that answer. Now, IBM tells us that the same system can tackle medical diagnosis and financial risk problems.
Alexander Wittig

Why a Chip That's Bad at Math Can Help Computers Tackle Harder Problems - 1 views

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    DARPA funded the development of a new computer chip that's hardwired to make simple mistakes but can help computers understand the world. Your math teacher lied to you. Sometimes getting your sums wrong is a good thing. So says Joseph Bates, cofounder and CEO of Singular Computing, a company whose computer chips are hardwired to be incapable of performing mathematical calculations correctly.
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    The whole concept boils down to approximate computing it seems to me. In a presentation I attended once I prospected if the same kind of philosophy could be used as a radiation hardness design approach, the short conclusion being that surely will depend on the functionality intended.
santecarloni

the Tricorder project - Science Tricorder Mark 2 - 1 views

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    ... each act member should have one, together with the mug... :) Se also http://www.youtube.com/watch?feature=player_embedded&v=y3sHTKrGdKI
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    I want one too! On a side note, his story about transformers is a nice illustration that being able to express something in a mathematical equation is not equivalent to understanding something.
Lionel Jacques

NASA investigates sending CubeSats to Phobos and back - 3 views

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    NASA's Innovative Advanced Concepts Program provides funding to study a small number of highly advanced spaceflight concepts, with the goal of understanding the technological possibilities which will guide the development of future space missions. Under this program, a JPL (Jet Propulsion Laboratory) researcher has proposed the use of a pair of CubeSats for an autonomous mission to retrieve samples from Phobos, Mars' larger moon.
LeopoldS

Graphite + water = the future of energy storage - Monash University - 6 views

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    any idea how this works - who wants to have a closer look at it?
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    Water is used for keeping the graphene stacks separate. Without water or some other separation method the different graphene stacks would just stick together and graphene would lose its nice properties (like a huge surface). So, water has nothing to do with energy but is just the material which keeps the graphene stacks at distance. The result is a gel. Still, energy needs to be stored in the gel.
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    and the different graphene layers act as anodes and cathodes??
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    Layer orientation in a gel is random. Additionally to that, cathodes and anodes are about charge seperation. Graphene layers are (as far as I understand) supposed to provide huge surfaces to which something, maybe a charge, can be attached. So do we need ions and electrons? Probably not. Probably just electrons which can travel easily through the gel. I guess the whole gel (and all layers inside) would be nagtively charged, making the gel blob a fluid cathode. But again, it's just a guess.
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    Wouldn't it be worth having a closer look?
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    it's still not clear to me how to get electricity in and out of this thing?
Luís F. Simões

HP Dreams of Internet Powered by Phone Chips (And Cow Chips) | Wired.com - 0 views

  • For Hewlett Packard Fellow Chandrakat Patel, there’s a “symbiotic relationship between IT and manure.”
  • Patel is an original thinker. He’s part of a group at HP Labs that has made energy an obsession. Four months ago, Patel buttonholed former Federal Reserve Chairman Alan Greenspan at the Aspen Ideas Festival to sell him on the idea that the joule should be the world’s global currency.
  • Data centers produce a lot of heat, but to energy connoisseurs it’s not really high quality heat. It can’t boil water or power a turbine. But one thing it can do is warm up poop. And that’s how you produce methane gas. And that’s what powers Patel’s data center. See? A symbiotic relationship.
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  • Financial house Cantor Fitzgerald is interested in Project Moonshot because it thinks HP’s servers may have just what it takes to help the company’s traders understand long-term market trends. Director of High-Frequency Trading Niall Dalton says that while the company’s flagship trading platform still needs the quick number-crunching power that comes with the powerhog chips, these low-power Project Moonshot systems could be great for analyzing lots and lots of data — taking market data from the past three years, for example, and running a simulation.
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    of relevance to this discussion: Koomey's Law, a Moore's Law equivalent for computing's energetic efficiency http://www.economist.com/node/21531350 http://hardware.slashdot.org/story/11/09/13/2148202/whither-moores-law-introducing-koomeys-law
LeopoldS

American Innovation Losing its Shine? - 4 views

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    interesting reflections by MIT head on innovation in US
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    interesting, especially since in all COmmission papers US innovation is praised and changes expected are only related to China/India (for the better)... Article mixes a lot talk on innovation with numbers that I do not see necessarily connected (trade deficit, GDP growth etc.). Seems to me the real problematique behind the article is only the next planned distribution of federal funds and where they should cut...
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    well I understand her point. Spending cuts are only vicious short term solutions against economical downturn since growth (GDP is an interesting measure indeed) comes from innovation, research and production. Nonetheless, what she is describing is happening in EU too. So who will take the lead? I am not certain China is the one. In my view, it has not yet solved its domestic issues... and US still has more Nobel Prize than China. One thing for sure, the way it is EU is only a "wagon" of the train...
Luís F. Simões

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

  • 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.
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  • Ref: arxiv.org/abs/1202.4495: Stochastic-Based Pattern Recognition Analysis
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    hey! This is essentially the Probabilistic Computing Ariadna
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    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 :-)
johannessimon81

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

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    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?
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    > 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

Supercooled water transforms into new form of liquid - 0 views

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    A liquid-liquid phase transition at 207K. The research is aimed at understanding what happens when thawing tissues from cyroprotection
Thijs Versloot

Creating a False Memory in the Hippocampus of mice - 2 views

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    The goal is to better understand how memory works to help for example against dementia, depression, stress.. but as we all know it would be great to learn how to fly a helicopter in 5 seconds as well.
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    ... or to make a first real inception ;)
LeopoldS

Physicists Discover Geometry Underlying Particle Physics | Simons Foundation - 7 views

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    Looks fantastic!
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    Luzi ... we need your critical insight!!
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    Definitely elegant.. although if true, it does put two of my closest friends out of a job...
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    Sounds like a great tool for calculation and may provide some deeper understanding. But: I think their comments about space and time are misleading. Often you can ignore space and time when you just want the probability of an event (and it makes your calculations easier) but especially in the low-energy regime an event is clearly localized.
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    where is Luzi? where is Anna? where is Sante? when you need them?
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