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Thijs Versloot

Active Metasurfaces for Advanced Wavefront Engineering #Harvard - 4 views

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    Metasurfaces have been made, but the problem is that they usually are static and for quantum optic applications the question is how to make a rapidly configurable metasurface. for this Harvard has initiated a multidisciplinary team that involves theoretical physics, metamaterials, nanophotonic circuitry, quantum devices, plasmonics, nanofabrication, and computational modeling
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    Reading "wavefront engineering" in the title I thought it had to do with wave manipulation in the sea. Nothing to do though. As I read further in this article, Harvard thrives in forming multidisciplinarity groups. Their practice is to call the best team in each expertise they need to merge. Not one researcher from each discipline, but teams of experienced professors and a series of graduate students. Maybe we could discuss it in the retreat!
Daniel Hennes

Japan is planning to build huge floating solar power plants - 4 views

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    Japan has started construction of two floating solar power plants, which will become part of a huge, 60 megawatt floating renewable energy network.
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    They should probably buddy up with the wave energy dudes and create the ultimate reneweable energy plant
LeopoldS

Access : Coherent terahertz control of antiferromagnetic spin waves : Nature Photonics - 1 views

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    terahertz lasers controling the spin of electrons ....
pacome delva

A Phase Transition for Light | Physical Review Focus - 3 views

  • A computer simulation shows the transition from "fermionic" to "liquid" light.
  • The possibility of sending this type of "self-focused" light pulse long distances could be important for remote sensing applications, such as LIDAR, which uses laser light the way radar uses radio waves.
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    what the heck is this?? sounds really strange but highly interesting to me ....
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    can we use this for energy transmission?
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    read it now more carefully and the answer is probably no ...
pacome delva

Penrose claims to have glimpsed universe before Big Bang - 0 views

  • According to Penrose and Gurzadyan, these circles allow us to "see through" the Big Bang into the aeon that would have existed beforehand. The circles, they say, are the marks left in our aeon by the spherical ripples of gravitational waves that were generated when black holes collided in the previous aeon.
  • Julian Barbour, a visiting professor of physics at the University of Oxford, says that these circles would be "remarkable if real and sensational if they confirm Penrose's theory". They would, he says, "overthrow the standard inflationary picture", which, he adds, has become widely accepted as scientific fact by many cosmologists. But he believes that the result will be "very controversial" and that other researchers will look at the data very critically. He says there are many disputable aspects to the theory
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    hehe, a nice controversy? or completely overinterpreted results...?
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    what the heck is this? sounds strange to me ... would I understand the original paper?
LeopoldS

The surprising motion of ski moguls - Physics Today November 2009 - 2 views

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    for those lucky ones currently on skis ....
LeopoldS

MIT researchers discover new way of producing electricity - 3 views

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    nice!!! got the info from Claudio ...
Luís F. Simões

Wind Power Without the Blades: Big Pics : Discovery News - 4 views

  • The carbon-fiber stalks, reinforced with resin, are about a foot wide at the base tapering to about 2 inches at the top. Each stalk will contain alternating layers of electrodes and ceramic discs made from piezoelectric material, which generates a current when put under pressure. In the case of the stalks, the discs will compress as they sway in the wind, creating a charge.
  • Based on rough estimates, said Núñez-Ameni the output would be comparable to that of a conventional wind farm covering the same area
  • After completion, a Windstalk should be able to produce as much electricity as a single wind turbine, with the advantage that output could be increased with a denser array of stalks. Density is not possible with conventional turbines, which need to be spaced about three times the rotor's diameter in order to avoid air turbulence. But Windstalks work on chaos and turbulence so they can be installed much closer together, said Núñez-Ameni.
  • ...1 more annotation...
  • Núñez-Ameni also reports that the firm is currently working on taking the Windstalk idea underwater. Called Wavestalk, the whole system would be inverted to harness energy from the flow of ocean currents and waves.
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    additional information: http://atelierdna.com/?p=144
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    isn't this a bit of a contradiction: on the one hand: "Based on rough estimates, said Núñez-Ameni the output would be comparable to that of a conventional wind farm covering the same area" and on the other: "After completion, a Windstalk should be able to produce as much electricity as a single wind turbine, with the advantage that output could be increased with a denser array of stalks. Density is not possible with conventional turbines, which need to be spaced about three times the rotor's diameter in order to avoid air turbulence. " still, very interesting concept!
pacome delva

Researchers Use Radio Waves to "See" Through Walls -- Berardelli 2009 (1015): 2 -- Scie... - 0 views

  • Researchers have discovered that an array of radio transceivers--devices that send and receive signals--can track people's movements behind walls. Possible uses include detecting people trapped in burning buildings, controlling lighting or heating and cooling systems as people enter or exit rooms, and spotting burglars or enemy soldiers.
pacome delva

One-way Mirror for Sound Waves | Physical Review Focus - 0 views

  • If the technique is practical, it could give designers new flexibility in making ultrasonic sources like those used in medical imaging.
nikolas smyrlakis

NASDAQ market index to track smart grid, electric infrastructure - Finance - Renewable ... - 0 views

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    how about that for smartgrids etc
Nicholas Lan

Hands-on with the Muse brain sensing headband -- the most important wearable of 2014 (e... - 4 views

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    interestingly it looks like a subject could wear it all day while doing normal stuff http://www.choosemuse.com/ "I got my hands on an early version of Interaxon's brainwave reading headband, the Muse, and I think this could be the most important wearable of the year. And that's saying a lot, considering I've seen 2014′s entire lineup for health tech at the Consumer Electronic Show as well as a few undisclosed athletic devices slated for later this year."
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    ..."alerts the users with sights and sounds when they are producing brain waves associated with calm and focus." ALERT! ALERT! ALERT! YOU ARE CALM AND FOCUSSED! :-D
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    indeed the app that comes with it sounds really lame but it comes with an sdk
Thijs Versloot

Twisted light waves sent across Vienna - 2 views

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    A group of researchers from Austria have sent twisted beams of light across the rooftops of Vienna. It is the first time that twisted light has been transmitted over a large distance outdoors, and could enable researchers to take advantage of the significant data-carrying capacity of light in both classical and quantum communications. Although the data rate is not very high, it could offer a way to provide unhackable data links via space. Would provide an edge over terrestrial fibre optics?
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
Thijs Versloot

Octopus robot makes waves with ultra-fast propulsion - 2 views

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    Technology/Robotics Scientists have developed an octopus-like robot, which can zoom through water with ultra-fast propulsion and acceleration never before seen in man-made underwater vehicles. Most fast aquatic animals are sleek and slender to help them move easily through the water but cephalopods, such as the octopus, are capable of high-speed escapes by filling their bodies with water and then quickly expelling it to dart away.
annaheffernan

Acoustic topological insulator could hide submarines - 2 views

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    Researchers have proposed a new "acoustic topological insulator" that could help alleviate sound scattering problems by transmitting sound in certain directions without any backscattering.
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    If I understood correctly the triangular structure would channel the incident sound wave to a unique direction between two options, according to the rotation direction of the cylinders included in its mesh. So, one (possibly two) directions left to detect the hypothetical submarines? Very interesting though, I hope no oceanographers take measurements simultaneously to the signals as climate models will get even more wrong...!
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