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Guido de Croon

Astro Drone featured on robohub! - 4 views

shared by Guido de Croon on 28 Mar 13 - No Cached
LeopoldS and Joris _ liked it
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    "Robohub is an online platform that brings together leading communicators in robotics research, start-ups, business, and education from around the world." What is nice about robohub is that they generally give a look behind the scenes of interesting robotic studies.
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    This is currently a very trendy subject in navigation, indeed. In your case, how exactly do you resolve the ambiguity? why only one 2D marker? what would be the conclusion exactly?
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    "leading communicators", love it!
LeopoldS

Linux Foundation Training Prepares the International Space Station for Linux Migration | Linux Foundation Training - 1 views

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    linux goes ISS ...
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    From there, it's just a tiny step to OSX :-)
LeopoldS

Better Than Human: Why Robots Will - And Must - Take Our Jobs | Gadget Lab | Wired.com - 1 views

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    interesting, long article ... a bit optimistic in my view
johannessimon81

Mathematicians Predict the Future With Data From the Past - 6 views

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    Asimov's Foundation meets ACT's Tipping Point Prediction?
  • ...2 more comments...
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    Good luck to them!!
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    "Mathematicians Predict the Future With Data From the Past". GREAT! And physicists probably predict the past with data from the future?!? "scientists and mathematicians analyze history in the hopes of finding patterns they can then use to predict the future". Big deal! That's what any scientist does anyway... "cliodynamics"!? Give me a break!
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    still, some interesting thoughts in there ... "Then you have the 50-year cycles of violence. Turchin describes these as the building up and then the release of pressure. Each time, social inequality creeps up over the decades, then reaches a breaking point. Reforms are made, but over time, those reforms are reversed, leading back to a state of increasing social inequality. The graph above shows how regular these spikes are - though there's one missing in the early 19th century, which Turchin attributes to the relative prosperity that characterized the time. He also notes that the severity of the spikes can vary depending on how governments respond to the problem. Turchin says that the United States was in a pre-revolutionary state in the 1910s, but there was a steep drop-off in violence after the 1920s because of the progressive era. The governing class made decisions to reign in corporations and allowed workers to air grievances. These policies reduced the pressure, he says, and prevented revolution. The United Kingdom was also able to avoid revolution through reforms in the 19th century, according to Turchin. But the most common way for these things to resolve themselves is through violence. Turchin takes pains to emphasize that the cycles are not the result of iron-clad rules of history, but of feedback loops - just like in ecology. "In a predator-prey cycle, such as mice and weasels or hares and lynx, the reason why populations go through periodic booms and busts has nothing to do with any external clocks," he writes. "As mice become abundant, weasels breed like crazy and multiply. Then they eat down most of the mice and starve to death themselves, at which point the few surviving mice begin breeding like crazy and the cycle repeats." There are competing theories as well. A group of researchers at the New England Complex Systems Institute - who practice a discipline called econophysics - have built their own model of political violence and
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    It's not the scientific activity described in the article that is uninteresting, on the contrary! But the way it is described is just a bad joke. Once again the results itself are seemingly not sexy enough and thus something is sold as the big revolution, though it's just the application of the oldest scientific principles in a slightly different way than used before.
Annalisa Riccardi

Frozen Frog :) - 5 views

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    Icing organs... Why scientists are so near and yet so far from being able to cryopreserve organs
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    Nice overview!
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!
  • ...5 more comments...
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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
santecarloni

Amateur planet hunters find a world with a four star rating | Bad Astronomy | Discover Magazine - 4 views

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    One more reason why we should be much more open about all these EO data we have .... The two citizen scientists, Kian Jek and Robert Gagliano, are listed as authors on the scientific paper recently published. I love this: the digital nature of these data make it far, far easier to analyze the science than it was in the past, and also easier to get the data out to people. Because of this, we have an explosive growth in these kinds of projects. Planet Hunters is great, but then so is Galaxy Zoo, Moon Mappers, Ice Hunters, and so many others. You can find several of these collected at the CosmoQuest website.
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    Wiktor is also collecting these science games in the ACT-wiki. You should have a look at: http://sophia.estec.esa.int/actwiki/index.php/On-line_Games_4_Science
santecarloni

The Higgs, Boltzmann Brains, and Monkeys Typing Hamlet | The Crux | Discover Magazine - 7 views

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    good luck with this....
  • ...3 more comments...
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    Nice article, actually! It summarizes in "human readable format" why and how too many cosmologists and string theorists just went bozo...
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    really ! this article should go for the ignobels ! http://arxiv.org/abs/0808.3778 I wonder which substance theorists are taking... I will avoid...! but really this is very preoccupating: "complex structures will occasionally emerge from the vacuum as quantum fluctuations, at a small but nonzero rate per unit spacetime volume. An intelligent observer, like a human, could be one such structure." Is this a new alternative to Darwinism...??? a support to creationism ?? How can a physicist can write such non-sense ?
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    and this is published in PRD !!!
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    In 1996 Sokal hoaxed sociologists with his famous nonsense text on political implications of quantum gravity. Can one play a similar game with "researchers" on Boltzmann brains, multiverses, string landscapes or similar? I doubt, this is just reality satire that can't be topped.
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    Poor Boltzmann ...
LeopoldS

Characterizing Quantum Supremacy in Near-Term Devices - 2 views

shared by LeopoldS on 04 Sep 16 - No Cached
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    google paper on quantum computers ... anybody with further insight on how realistic this is
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    Not an answer to Leopold's question but here is a little primer on quantum computers for those that are (like me) still confused about what they actually do: http://www.dwavesys.com/tutorials/background-reading-series/quantum-computing-primer It give a good intuitive idea of the kinds of problems that an adiabatic quantum computer can tackle, an easy analogy of the computation and an explanation of how this get set up in the computer. Also, there is emphasis on how and why quantum computers lend themselves to machine learning (and maybe trajectory optimization??? - ;-) ).
Alexander Wittig

Gene name errors are widespread in the scientific literature - 0 views

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    The spreadsheet software Microsoft Excel, when used with default settings, is known to convert gene names to dates and floating-point numbers. A programmatic scan of leading genomics journals reveals that approximately one-fifth of papers with supplementary Excel gene lists contain erroneous gene name conversions. The reason why you shouldn't use Excel (or Numbers or OpenOffice or ...) without knowing what it actually really does!
jcunha

Sleepy and dreamless mutant mice - 1 views

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    It's proven, sleepiness is genetic.
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    Why it is written 0 views if I read it ?!
jaihobah

Measurement of Impulsive Thrust from a Closed Radio-Frequency Cavity in Vacuum (AIAA) - 2 views

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    An intermediate level discussion of those results by Scott Manley (Physicist, Kerbal Space Program YouTuber): https://www.youtube.com/watch?v=JGcvxg7jJTs
LeopoldS

Home | International Space Apps Challenge - 0 views

shared by LeopoldS on 11 Mar 12 - No Cached
Joris _ liked it
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    Why didn't we come up with this :-(
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    You can still contribute by proposing an interesting challenge, as 90% of those present at the moment revolve around "here in NASA we have tons of data and no clue what to do with it" (booooooriiiiiiiinggg)
santecarloni

How The Cost of Computation Restricts The Processes of Life - Technology Review - 1 views

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    "That's why silicon chips operate at temperatures hot enough to fry eggs." I stopped reading after this sentence... is the remaining part of the article equally scientifically (in)accurate?
LeopoldS

How Apple Killed the Linux Desktop and Why That Doesn't Matter | Wired Enterprise | Wired.com - 2 views

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    nice read ... let's hope since Apple got anyway already too powerful
johannessimon81

NASA's Newest Autonomous Lander Passes Flight Test - 1 views

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    Why don't they use time to contact / optical flow ... Guido!!!!!!
Dario Izzo

Why Most Research Findings are False - 4 views

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    Excluding all mine, which ACT paper contains False claims?
Lionel Jacques

String-theory calculations describe 'birth of the universe' - 0 views

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    Researchers in Japan have developed what may be the first string-theory model with a natural mechanism for explaining why our universe would seem to exist in three spatial dimensions if it actually has six more. According to their model, only three of the nine dimensions started to grow at the beginning of the universe, accounting both for the universe's continuing expansion and for its apparently three-dimensional nature. ... The team has yet to prove that the Standard Model of particle physics will show up in its model,...
Guido de Croon

IEEE spectrum post on the IMAV 2011 - 6 views

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    well done ... why your name does not appear there?
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