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johannessimon81

This incredible electron micrograph shows light as both a particle and a wave - 4 views

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    So basically we can photograph light now. Not just detect photons but photograph LIGHT WAVES. Really clever setup BTW.
annaheffernan

Filamentous laser beams point to new type of phase transition - applications in weather... - 1 views

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    Filaments of plasma created by a high-powered laser beam undergo a similar type of phase transition as liquid percolating through a porous material - that is the conclusion of physicists in Switzerland. The also describe the application of laser filamentation for directed lightening and encouraged rainfall - Isabelle should come back to take a closer look :p
Thijs Versloot

Alien star invaded the Solar System - 1 views

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    An alien star passed through our Solar System just 70,000 years ago, astronomers have discovered. No other star is known to have approached this close to us. An international team of researchers says it came five times closer than our current nearest neighbour - Proxima Centauri.

    Passing straight through the Oort Cloud region. This must have left some sort of mark maybe? A binary system of a red and brown dwarf (8% and 6% solar masses) so maybe not a too significant impact on trajectories in the Oort cloud?
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    I read this earlier and thought it might be another one of those alien conspiracy stuff. Freaky stuff.
jmlloren

The artificial skylight that you won't believe isn't real - 9 views

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    Nautral Light for Human Space Exploration
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    wow, that looks pretty real to me! I remember a presentation some time ago on difficulties with large scale LED lights for making directed light sources. I guess we can cross that off the list :)
jcunha

Nature Optics: Super vision - 6 views

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    Taking images through opaque, light-scattering layers is a vital capability and essential diagnostic tool in many applications.

    The research group of Prof. Mosk of U. Twente have started doing experiments shooting optical lasers into opaque materials in 2007, and for surprise of everyone, it turn out the light intensity after the opaque material in their experiments was orders of magnitude bigger than expected.

    Following these results they succeeded in taking non-invasive sharp pictures of objects hidden behind a screen of opaqueness, the so referred Super Vision in this Nature overview article.
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    very nice!!!
jcunha

Missing link in metal physics explains Earth's magnetic field - 0 views

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    In a work published on Nature (http://www.nature.com/nature/journal/v517/n7536/full/nature14090.html#affil-auth) a new DFT based simulation of convection in Earth's Core iron shows that electron-electron scattering has a similar contribution to electron's thermal vibration.
    The outcome is that using the old dynamo theory the simulation matches the Earth magnetic field experimental results, solving an 80 years old puzzle.
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    Yay to science! I'm always intrigued by related experiments that try to measure material properties at the GPa range. Especially, the efforts of reaching 'metallic hydrogen' (http://en.wikipedia.org/wiki/Metallic_hydrogen), requiring pressures above 25GPa at which hydrogen becomes conductive. It is thought that gas giant planets could have such a core, but no-one has been able to produce/verify this theory as off yet.
Thijs Versloot

Popper's experiment realized again-but what does it mean? - 1 views

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    Although it may seem like the above two experiments violate the uncertainty principle because the results show a smaller-than-required degree of uncertainty, Shih and his coauthors explain that no violation has occurred due to the fact that the experiments involve photon pairs rather than individual photons. The scientists argue that Popper's original thought experiment was based on a misunderstanding of the proper context of the uncertainty principle: it governs the behavior of single particles only, not the "correlation" of two particles.
annaheffernan

How to make tiny 3D flowers and peacocks from silicon - 1 views

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    "Tilted table", "peacock" and "triple-floor building" are just three of many fantastical 3D structures that have been created by compressing simple 2D patterns. The new technique for creating these objects is called compressive buckling, and has been developed by researchers in the US, China and South Korea.
annaheffernan

New apps allow smartphone users to join the hunt for ultrahigh-energy cosmic rays - 0 views

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    Two apps - the Distributed Electronic Cosmic-ray Observatory (DECO) and Cosmic Rays Found in Smartphones (CRAYFIS) - transform smartphones into miniature cosmic-ray detectors. They use the CMOS chips inside phones' onboard cameras to detect the secondary particles produced when cosmic rays - energetic, charged subatomic particles arriving from beyond the solar system - collide with air molecules in the Earth's atmosphere
jcunha

Artifitial Intelligence to predict solar flares - 0 views

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    A team from Stanford showing possibility of solar flare prediction using AI techniques and data from the NASA SDO observatory.
Thijs Versloot

Improved Saturn Positions Help Spacecraft Navigation, Planet Studies, Fundamental Physics - 0 views

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    Scientists have used the National Science Foundation's Very Long Baseline Array (VLBA) radio-telescope system and NASA's Cassini spacecraft to measure the position of Saturn and its family of moons to within about a mile -- at a range of nearly a billion miles.
Christophe Praz

Scientific method: Defend the integrity of physics - 2 views

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    Interesting article about theoretical physics theories vs. experimental verification. Can we state that a theory can be so good that its existence supplants the need for data and testing ? If a theory is proved to be untestable experimentally, can we still say that it is a scientific theory ? (not in my opinion)
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    There is an interesting approach by Feynman that it does not make sense to describe something of which we cannot measure the consequences. So a theory that is so removed from experiment that it cannot be backed by it is pointless and of no consequence. It is a bit as with the statement "if a tree falls in the forrest and nobody is there to hear it, does it make a sound?". We would typically extrapolate to say that it does make a sound. But actually nobody knows - you would have to take some kind of measurement. But even more fundamentally it does not make any difference! For all intents and purposes there is no point in forcing a prediction that you cannot measure and that therefore has noto reflect an event in your world.
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    "Mathematics is the model of the universe, not the other way round"
    - M. R.
annaheffernan

Physicsworld top 10 breakthroughs of the year - at the top Rosetta - 3 views

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    Physicsworld releases their top 10 breakthroughs of the year 2014, ESA's Rosetta mission tops the list with the achievement of landing on a comet.
Paul N

Have We Been Interpreting Quantum Mechanics Wrong This Whole Time? - 6 views

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    "The experiments involve an oil droplet that bounces along the surface of a liquid. The droplet gently sloshes the liquid with every bounce. At the same time, ripples from past bounces affect its course. The droplet's interaction with its own ripples, which form what's known as a pilot wave, causes it to exhibit behaviors previously thought to be peculiar to elementary particles - including behaviors seen as evidence that these particles are spread through space like waves, without any specific location, until they are measured."

    Pilot-wave theory reresurrected. Maybe something for the next "fundamental" :P physics RF?
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    And for the next 'Experimental Physics Stagiaire' position why not try to do "Unpredictable Tunneling of a Classical Wave-Particle Association" http://stilton.tnw.utwente.nl/people/eddi/Papers/PhysRevLett_TUNNEL.pdf, there are some rumors online that the results of Yves Couder Experiments can be reproduced with simple DIY vibrating tables!

    It is very funny to see the videos of the MIT's replication of this experiment (with lightening legends for those who are uncomfortable with the concepts involved https://www.youtube.com/watch?v=YF5iHQMjcsM)
jcunha

Mystery of where Earth's water came from deepens: Comet water is different - 2 views

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    "Over the past few months, the European Space Agency's Rosetta space probe closely examined the type of comet that some scientists theorized could have brought water to our planet 4 billion years ago. It found water, but the wrong kind."
LeopoldS

physicists explain what AI researchers are actually doing - 5 views

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    love this one ... it seems to take physicist to explain to the AI crowd what they are actually doing ...

    Deep learning is a broad set of techniques that uses multiple layers of representation to automatically learn relevant features directly from structured data. Recently, such techniques have yielded record-breaking results on a diverse set of difficult machine learning tasks in computer vision, speech recognition, and natural language processing. Despite the enormous success of deep learning, relatively little is understood theoretically about why these techniques are so successful at feature learning and compression. Here, we show that deep learning is intimately related to one of the most important and successful techniques in theoretical physics, the renormalization group (RG). RG is an iterative coarse-graining scheme that allows for the extraction of relevant features (i.e. operators) as a physical system is examined at different length scales. We construct an exact mapping from the variational renormalization group, first introduced by Kadanoff, and deep learning architectures based on Restricted Boltzmann Machines (RBMs). We illustrate these ideas using the nearest-neighbor Ising Model in one and two-dimensions. Our results suggests that deep learning algorithms may be employing a generalized RG-like scheme to learn relevant features from data.
Paul N

Room temperature superconductors - 4 views

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    With the aid of short infrared laser pulses, researchers have succeeded for the first time in making a ceramic superconducting at room temperature - albeit for only a few millionths of a microsecond.
jcunha

Quantum machine learning - 1 views

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    Quantum Computing and Machine Learning in the same sentence. The association started to be put forward by Google and NASA playing with D-WAVE computers.

    Meanwhile in the academic media, https://journals.aps.org/prx/pdf/10.1103/PhysRevX.4.031002
Christophe Praz

Gallery of Fluid Motion - 0 views

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    Awarded videos of fluid motion presented at the APS DVD meeting. Very cool stuff.

    #0084 is done with the setup I used for my master thesis.
Christophe Praz

Mars Spacecraft Reveal Comet Flyby Effects on Martian Atmosphere - 1 views

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    NASA and ESA spacecraft have gathered new information about the basic properties of the comet's nucleus (not 67p) and directly detected the effects on the Martian atmosphere.

    Dust from the comet impacted Mars and was vaporized high in the atmosphere, producing what was likely an impressive meteor shower. Eight different types of metal ions have been detected, including sodium, magnesium and iron.

    The satellites will now continue to look for long-term perturbations to Mars' atmosphere.
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