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pacome delva

Quantum effect spotted in a visible object - 0 views

physicsworld.com/...42019

phy quantum_physics decoherence Schrodinger_cat

shared by pacome delva on 19 Mar 10 - Cached
  • In this way the researchers created a superposition state of the resonator where they simultaneously had an excitation in the resonator and no excitation in the resonator, such that when they measured it, the resonator has to "choose" which state it is in. "This is analogous to Schrödinger's cat being dead and alive at the same time," says Cleland.
  • pacome delva on 19 Mar 10
     
    The Schrodinger cat with drums, that's for Nik ;)
pacome delva

Planets 'Sing' in Three-Part Harmony - 0 views

news.sciencemag.org/...shot-planets-sing-in-thre.html

celestial_mechanics extrasolar_planets resonance

shared by pacome delva on 05 Jul 10 - Cached
  • this is the first three-planet resonance ever seen.
  • The three planets are in a 4:2:1 resonance: the innermost giant completes four orbits in the time the middle one completes two and the newfound outermost world completes one.
  • pacome delva on 05 Jul 10
     
    for Francesco!
ESA ACT

Nonradiative Resonant Excitation Transfer from Nanocrystal Quantum Dots to Adjacent Quantum Channels - 0 views

pubs.acs.org/...nl0719731.html

nan energy

shared by ESA ACT on 24 Apr 09 - No Cached
  • ESA ACT on 24 Apr 09
     
    Nonradiative resonant energy transfer in optimized QD-QW systems may provide a solar energy conversion approach with a viable tradeoff with the bottlenecks of charge carrier generation and/or transport to/in electrodes faced by excitonic solar cells.
Marcus Maertens

xkcd: Galilean Moons - 3 views

xkcd.com

space fun

shared by Marcus Maertens on 06 Dec 13 - Cached
  • Marcus Maertens on 06 Dec 13
     
    These annoying resonances... I want to kill Io after this!
annaheffernan

Graphene drum could store quantum information - 4 views

physicsworld.com/...ould-store-quantum-information

PHY science technology quantum

shared by annaheffernan on 06 Oct 14 - No Cached
  • annaheffernan on 06 Oct 14
     
    Devices made from resonating graphene "drums" could be used as microwave amplifiers and memory chips in quantum computers. So say researchers at the Kavli Institute of Nanoscience at the Delft University of Technology in the Netherlands, who are the first to demonstrate optomechanical coupling between a mechanical resonator and a superconducting microwave cavity.
santecarloni

Sharpening the Nanofocus: Berkeley Lab Researchers Use Nanoantenna to Enhance Plasmonic Sensing « Berkeley Lab News Center - 0 views

newscenter.lbl.gov/...a-to-enhance-plasmonic-sensing

nan technology

shared by santecarloni on 18 May 11 - No Cached
  • santecarloni on 18 May 11
     
    See Also: Matter & Energy Nanotechnology Optics Physics Materials Science Graphene Organic Chemistry Reference White gold Electromagnetic radiation Nanomedicine Nanoparticle Any use for the smell project? "We have demonstrated resonant antenna-enhanced single-particle hydrogen sensing in the visible region and presented a fabrication approach to the positioning of a single palladium nanoparticle in the nanofocus of a gold nanoantenna,"
ESA ACT

Three-dimensional left-handed material lens - 0 views

scitation.aip.org/...GetabsServlet

PHY Photonics optics

shared by ESA ACT on 24 Apr 09 - No Cached
  • ESA ACT on 24 Apr 09
     
    A model is provided for the image formation by a three-dimensional lens with negative index of refraction (n) and compared with results for an array of split-ring resonators (SRRs) and wires. For n=−1, a linear decrease in image distance r is expected w
Lionel Jacques

Prolonged Space Travel Causes Brain and Eye Abnormalities in Astronauts | SpaceRef - Your Space Reference - 1 views

www.spaceref.com/...viewpr.html

Bio space Science

shared by Lionel Jacques on 15 Mar 12 - No Cached
  • Lionel Jacques on 15 Mar 12
     
    "Magnetic resonance imaging (MRI) of the eyes and brains of 27 astronauts who have spent prolonged periods of time in space revealed optical abnormalities similar to those that can occur in intracranial hypertension of unknown cause, a potentially serious condition in which pressure builds within the skull."
santecarloni

First flat lens focuses light without distortion - physicsworld.com - 0 views

physicsworld.com/...cuses-light-without-distortion

light lens PHY science

shared by santecarloni on 24 Sep 12 - No Cached
LeopoldS liked it
  • santecarloni on 24 Sep 12
     
    Physicists in the US have made the first ultrathin flat lens. Thanks to its flatness, the device eliminates optical aberrations that occur in conventional lenses with spherical surfaces. As a result, the focusing power of the lens also approaches the ultimate physical limit set by the laws of diffraction.
  • LeopoldS on 24 Sep 12
     
    Really nice indeed! The new flat ultrathin lens is different in that it is a nanostructured "metasurface" made of optically thin beam-shaping elements called optical antennas, which are separated by distances shorter than the wavelength of the light they are designed to focus. These antennas are wavelength-scale metallic elements that introduce a slight phase delay in a light ray that scatters off them. The metasurface can be tuned for specific wavelengths of light by simply changing the size, angle and spacing between the nanoantennas. "The antenna is nothing more than a resonator that stores light and then releases it after a short time delay," Capasso says. "This delay changes the direction of the light in the same way that a thick glass lens would." The lens surface is patterned with antennas of different shapes and sizes that are oriented in different directions. This causes the phase delays to be radially distributed around the lens so that light rays are increasingly refracted further away from the centre, something that has the effect of focusing the incident light to a precise point.
Thijs Versloot

Combined nanoplasmonic and optical resonators produces laser-like light emission - 0 views

www.sciencedaily.com/...140826121139.htm

optics laser amplification plasmonic

shared by Thijs Versloot on 27 Aug 14 - No Cached
annaheffernan liked it
  • Thijs Versloot on 27 Aug 14
     
    "We have made optical systems at the microscopic scale that amplify light and produce ultra-narrowband spectral output," explained J. Gary Eden, a professor of electrical and computer engineering (ECE) at Illinois. "These new optical amplifiers are well-suited for routing optical power on a chip containing both electronic and optical components.
Luís F. Simões

Timelapse video of asteroid discoveries in our solar system from 1980-2010 (watch in 1080p) - 5 views

www.youtube.com/watch

asteroid detection solar system WISE

shared by Luís F. Simões on 13 Sep 10 - No Cached
Joris _ liked it
  • Ma Ru on 14 Sep 10
     
    Nice... Now I have a lame question: after you have discovered ~500k asteroids, all moving (I assume more or less) chaotically in that asteroid belt, how do you tell one from another?
  • ...1 more comment...
  • Joris _ on 14 Sep 10
     
    hmm, not very chaotic indeed - laws of Kepler plus some perturbations.
  • Ma Ru on 15 Sep 10
     
    That's what I thought but when presented as a green "goo" in the video, it appears rather unordered... so I guess this is just an impression evoked by a not-to-scale presentation?
  • Francesco Biscani on 19 Sep 10
     
    It depends... orbits can be chaotic if the orbital period is in a resonance with Jupiter, although such orbits are not stable. Such configurations tend to get disrupted pretty quickly (in cosmic terms :P) http://en.wikipedia.org/wiki/Kirkwood_gap
pacome delva

3D invisibility cloak unveiled - physicsworld.com - 1 views

physicsworld.com/...42043

transformation_optics cloaking

shared by pacome delva on 29 Mar 10 - Cached
  • For Wegener the aim of the work is not about focusing all efforts on creating invisibility cloaks, but is about exploring a range of applications in transformation optics. This involves calculating what kind of material is needed to bend light in a certain way, by considering light trajectories as the result of the warping of space. Wegener says that transformation optics should lead, for example, to the design of better antennas or smaller optical resonators.
  • Luzi Bergamin on 29 Mar 10
     
    We don't have Science Express subscription here, so I have to wait till the normal paper is out. From what I heard about it, I doubt that this would have made it to Science without the names Pendry and Wegener in the autor list! Certainly, they are two of the smartest guys in Metamaterials, but they are also two of the absolut class A sellers. Pendry by definition is the first in whatever (at least in HIS talks...) but apart from this he's a very nice guy. Better let's not try to characterize Wegener...
LeopoldS

Realization of a gravity-resonance-spectroscopy technique : Nature Physics : Nature Publishing Group - 1 views

www.nature.com/...nphys1970.html

PHY science NRG

shared by LeopoldS on 18 Apr 11 - No Cached
  • LeopoldS on 18 Apr 11
     
    Sante have a look at this ... sounds fascinating ... 
anonymous

Nasa validates 'impossible' space drive (Wired UK) - 3 views

www.wired.co.uk/...lidates-impossible-space-drive

PHY space nasa propulsion emdrive

shared by anonymous on 31 Jul 14 - No Cached
  • anonymous on 31 Jul 14
     
    NASA validates the EmDrive (http://emdrive.com/) technology for converting electrical energy into thrust. (from the website: "Thrust is produced by the amplification of the radiation pressure of an electromagnetic wave propagated through a resonant waveguide assembly.")
  • ...3 more comments...
  • LeopoldS on 01 Aug 14
     
    I would be very very skeptic on this results and am actually ready to take bets that they are victims of something else than "new physics" ... some measurement error e.g.
  • anonymous on 02 Aug 14
     
    Assuming that this system is feasible, and taking the results of Chinese team (Thrust of 720 mN http://www.wired.co.uk/news/archive/2013-02/06/emdrive-and-cold-fusion), I wonder whether this would allow for some actual trajectory maneuvers (and to which degree). If so, can we simulate some possible trajectories, e.g. compare the current solutions to this one ? For example, Shawyer (original author) claims that this system would be capable of stabilizing ISS without need for refueling. Other article on the same topic: http://www.theverge.com/2014/8/1/5959637/nasa-cannae-drive-tests-have-promising-results
  • Thijs Versloot on 04 Aug 14
     
    To be exact, the chinese reported 720mN and the americans found ~50microN. The first one I simply do not believe and the second one seems more credible, yet it has to be said that measuring such low thrust levels on a thrust-stand is very difficult and prone to measurement errors. @Krzys, the thrust level of 720mN is within the same range of other electric propulsion systems which are considered - and even used in some cases - for station keeping, also for the ISS actually (for which there are also ideas to use a high power system delivering several Newtons of thrust). Then on the idea, I do not rule out that an interaction between the EM waves and 'vacuum' could be possible, however if this would be true then this surely would be detectable in any particle accelerator as it would produce background events/noise. The energy densities involved and the conversion to thrust via some form of interaction with the vacuum surely could not provide thrusts in the range reported by the chinese, nor the americans. The laws of momentum conservation would still need to apply. Finally, 'quantum vacuum virtual plasma'.. really?
  • annaheffernan on 04 Aug 14
     
    I have to join the skeptics on this one ...
  • Marcus Maertens on 09 Aug 14
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