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jaihobah

Phys. Rev. Lett. 116, 031301 (2016) - Dark Matter Velocity Spectroscopy - 1 views

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    'Whether mysterious high-energy photon emissions from our Galaxy come from dark matter or a more mundane source might be resolved by detecting their Doppler shifts along different lines-of-sight.'
jaihobah

The Nanodevice Aiming to Replace the Field Effect Transistor - 1 views

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    very nice!
    "For a start, the wires operate well as switches that by some measures compare well to field effect transistors. For example they allow a million times more current to flow when they are on compared with off when operating at a voltage of about 1.5 V. "[A light effect transistor] can replicate the basic switching function of the modern field effect transistor with competitive (and potentially improved) characteristics," say Marmon and co.

    But they wires also have entirely new capabilities. The device works as an optical amplifier and can also perform basic logic operations by using two or more laser beams rather than one. That's something a single field effect transistor cannot do."
joergmueller

Caltech Researchers Find Evidence of a Real Ninth Planet | Caltech - 0 views

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    Caltech researchers have found evidence of a giant planet tracing a bizarre, highly elongated orbit in the outer solar system. The object, which the researchers have nicknamed Planet Nine, has a mass about 10 times that of Earth and orbits about 20 times farther from the sun on average than does Neptune (which orbits the sun at an average distance of 2.8 billion miles).
jcunha

The physics of life - 2 views

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    Research in active-matter systems is a growing field in biology. It consists in using theoretical statistical physics in living systems such as molecule colonies to deduce macroscopic properties. The aim and hope is to understand how cells divide, take shape and move on these systems.
    Being a crossing field between physics and biology "The pot of gold is at the interface but you have to push both fields to their limits." one can read
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    Maybe we should discuss about this active matter one of these days?

    "These are the hallmarks of systems that physicists call active matter, which have become a major subject of research in the past few years. Examples abound in the natural world - among them the leaderless but coherent flocking of birds and the flowing, structure-forming cytoskeletons of cells. They are increasingly being made in the laboratory: investigators have synthesized active matter using both biological building blocks such as microtubules, and synthetic components including micrometre-scale, light-sensitive plastic 'swimmers' that form structures when someone turns on a lamp. Production of peer-reviewed papers with 'active matter' in the title or abstract has increased from less than 10 per year a decade ago to almost 70 last year, and several international workshops have been held on the topic in the past year."
jcunha

Experimental evidence for new Flexo-electric nanomaterial - 1 views

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    A new experiment proved the existence of a new effect in nanomaterials: flexo-electric effect. The material has built-in mechanical tension that changes shape when you apply electrical voltage, or that generates electricity if you change its shape and was theorized some decades ago.
    Now, SrTiO3 allowed to observe this new effect, being comparable with piezoelectric effect.
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    My old twente university group! :)
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    Isn't muscle wire quite old technology though?
Paul N

New derivation of pi links quantum physics and pure math - 5 views

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    In 1655 the English mathematician John Wallis published a book in which he derived a formula for pi as the product of an infinite series of ratios. Now researchers from the University of Rochester, in a surprise discovery, have found the same formula in quantum mechanical calculations of the energy levels of a hydrogen atom.
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    This is insanity, Max.
    Or maybe it's genius.
joergmueller

In a new round of testing, NASA confirms yet again that the 'impossible' EMdrive thrust... - 4 views

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    Engineer Roger Shawyer's controversial EM Drive thruster jets back into relevancy this week, as a team of researchers at NASA's Eagleworks Laboratories recently completed yet another round of testing on the seemingly impossible tech.
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    I like this just because it will end up on Thijs' desk :D
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    Interesting that the new comes in... Yahoo Finance :). Another more complete article http://nextbigfuture.com/2015/11/nasa-eagleworks-has-tested-upgraded.html
jcunha

Holographic acoustic elements for manipulation of levitated objects - 0 views

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    Cool scientific and technical feat in engineering a tractor beam. See the explanation video here http://www.nature.com/ncomms/2015/151027/ncomms9661/extref/ncomms9661-s3.mov and the thing working in real time here http://www.nature.com/ncomms/2015/151027/ncomms9661/extref/ncomms9661-s2.mov
aborgg

Watch Uranium Emit Radiation - 2 views

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    You've heard of the catastrophic effects of radiation on environments, animals and humans. A seemingly silent and invisible destroyer, radiation can make whole cities inhabitable for hundreds of years. But have you ever wondered what radiation actually looks like? There may be one image that jumps to mind.

    We saw the same detector setup in the room opposite to ours during the Open Day! Using uranium is just cooler. :)
jcunha

New angry birds type game with cats and quantum mechanics - 6 views

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    "A new Angry Birds-style game is set to help launch a new understanding of quantum science. Some find the concepts of quantum science confusing or unintuitive. Einstein even called quantum effects "spooky." To help people better understand some of the core concepts of quantum science, the Institute for Quantum Computing (IQC) at the University of Waterloo is launching a game - the Quantum Cats"

    Looking forward to see the ACT winning the Quantum Cats competition :)
jcunha

Chemical analysis in Earth and Space via Raman Spectroscopy - 2 views

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    "A new lightweight, energy-efficient tool for analyzing a material's chemical makeup could improve the detection abilities of various technologies, ranging from bomb-detecting drones to space rovers searching for signs of life".

    Raman Spectroscopy is about measuring vibrational modes in molecules. This vibrational modes are in the meV typically, turning Raman Spectroscopy into a high precision technique. This impressive work shows a new technique based on the use of optical fibers coupled to photomultipliers allowing its use, author's word, in extreme conditions such as unmanned aircraft vehicles (UAVs) and Mars/Moon rovers.
jcunha

New methods to make longer streams of plasma with greater longevity could lead to laser... - 0 views

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    More developments in the laser filamentation community.
    Makes me wonder again about Christophe's ideas for a space-formed filament as new and efficient microwave waveguide.
aborgg

Electron waves refract negatively - 1 views

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    Waves of electrons have been bent backward in a sheet of graphene, allowing physicists to focus electrons the way a lens focuses light.

    Electrons coursing through a sheet of carbon atoms exhibited negative refraction, bending at angles not seen in nature. By exploiting this unusual bending, the researchers created a lenslike device to focus the electrons to a tiny point. The new technique could help physicists learn how to manipulate electrons in the tight confines of miniaturized electronic devices, where the particles often behave like waves.
jcunha

Explosion-Generated Collapsing Vacuum Bubbles Reach 20,000 Kelvin - 1 views

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    "In a recent paper published in Physical Review Letters (PRL) Jérôme Duplat and Emmanuel Villermaux developed a method to generate centimeter-sized vacuum bubbles in water with miniature laser-driven explosions, and observed the flash of light produced as the bubble collapsed a not-fully-understood phenomenon known as sonoluminescence." Amazingly they concluded that the temperatrue inside the bubble as it collapses is about 26000 K. At this temperatures some (not me) argue for nuclear fusion...

    Intriguing stuff!!! Check the videos! Yet another test for the 'Experimental Physics Stagiare' :-)?
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    For sure no fusion, that starts appr. from about 20keV, not 20kK. Between both there is still a factor of 11500. What I would rather expect is that the conditions are not appropriate to work with Maxwellian distribution functions. If certain fusion products should be measurable, than this would rather confirm (but not proof) the hypothesis that they do not have Maxwellians but something close to monoenergetic. But most probably they will not measure fusion products, hence no fusion, hence no confusion.
jcunha

Nature: Spawning rings of exceptional points out of Dirac cones - 3 views

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    Dirac cones, a band-structure of two cones touching each other, are the key to understand graphene exceptional properties. They also appear in the theory of photon waveguides and atoms in optical lattices. In here, the study of a Dirac cone deformation in an open system (a system that is perturbed by external agents) lead to the deformation of the Dirac cone, meaning a change in the fundamental properties of the system. This change is such that strange phenomena such as unidirectional transmission or reflection or lasers with single mode (really single) operation can be achieved.

    Proved experimentally in photonic crystals. New way for extremely pure lasers?
jcunha

AGM2015: Antineutrino Global Map 2015 : Scientific Reports - 1 views

shared by jcunha on 08 Sep 15 - No Cached
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    Cool study about measuring antineutrino emissions in order to prospect composition of Earth's crust and mantle.
Nina Nadine Ridder

Is Hawking any closer to solving the puzzle of black holes? - 2 views

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    After this lunch lecture probably not as ground breaking as I thought earlier but still an interesting read...

    "The new solution involves supertranslations, something that I have yet to get my head properly around. But it seems to rely on the well known fact that an "image" of infalling matter seems to get imprinted onto the "surface" of a black hole."
jcunha

New frequency record breaking laser in the X-ray - 0 views

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    Good news for the imaging community: simpler and smaller x-ray sources are on the way.
Ma Ru

An intellectually challenging game of loop - 3 views

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    In case you are looking for inspiration for a new piece of ACT's meeting room furniture...

    "This is almost an example, not of mathematics but how mathematics changes when it becomes physics"
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