Skip to main content

Home/ Diigo In Education/ Group items tagged onde

Rss Feed Group items tagged

Jac Londe

Physicists uncover novel phase of matter - 22 views

    A team of physicists led by Caltech's David Hsieh has discovered an unusual form of matter-not a conventional metal, insulator, or magnet, for example, but something entirely different. This phase, characterized by an unusual ordering of electrons, offers possibilities for new electronic device functionalities and could hold the solution to a long-standing mystery in condensed matter physics having to do with high-temperature superconductivity-the ability for some materials to conduct electricity without resistance, even at "high" temperatures approaching -100 degrees Celsius.
Jac Londe

Confirming Einstein, scientists find 'spacetime foam' not slowing down photons from far... - 13 views

    One hundred years after Albert Einstein formulated the general theory of relativity, an international team has proposed another experimental proof. In a paper published today in Nature Physics, researchers from the Hebrew University of Jerusalem, the Open University of Israel, Sapienza University of ...
Jac Londe

Limites d'exposition humaine à l'énergie électromagnétique radioélectrique da... - 6 views

    Quelle est notre capacité d'absorption des ondes életromagnétiques ?
Jac Londe

Truly random numbers - 41 views

  • At a quantum scale, the motion of electrons and protons is completely and genuinely random, since it doesn’t follow a clear path of cause and effect. You basically have no idea what’s going to happen. If you can measure this somehow, than you’ve got yourself an absolutely random value.
  • “If you want to defeat an adversary who is trying to hack into your system, basically you need large quantities of random numbers,”  Sussman said.
  • “…a truly random number generator will provide impenetrable encryption for communications — be they military transmissions, secure banking, or online purchasing — that underpin the modern connected world.”
  • ...3 more annotations...
  • The researchers used pulses of laser light, which only last a trillionth of a second, that were directed through a diamond. The light comes and goes through the diamond, however when it exists it’s changed, since it has to pass through quantum vacuum fluctuations, the microscopic flickering of the amount of energy in a point in space. Scientists can measure these pulses of light that emerge from the experimental set-up, measurements which are the truly random.
  • random numbers
  • with quantum physics
Jac Londe

Brain-Art Competition 2011 - 37 views

  • The Brain-Art Competition
  • In order to recognize the beauty and creativity of artistic renderings emerging from the neuroimaging community, we are launching the first annual Brain-Art Competition. Countless hours are devoted to creation of informative visualizations for communicating neuroscientific findings. This competition aims to recognize the artistic creativity of our community that often goes unappreciated in the publication process.

  • We are inviting researchers to submit their favorite unpublished works for entry.  Both team and single-person entries are welcomed. The competition will have four award categories:

    1. 1)Best 3-Dimensional Brain Rendering

    2. 2)Best Representation of the Human Connectome

    3. 3)Best Abstract Brain Illustration

    4. 4)Best Humorous Brain Illustration

Jac Londe

The Electron is round. Incredibly round | ZME Science - 59 views

  • The experiments, which spanned more than a decade, suggest that the electron differs from being round by less than 0.000000000000000000000000001 cm. Just so you can get an estimate, if the electron were as big as the solar system, it would still be spherical to within the width of a human hair.
  • a team from the Imperial College London concluded that the electron is actually incredibly round, thus making the most accurate estimate of its shape.
Jac Londe

Scientists capture first direct images of theoretically predicted magnetic monopoles - 19 views

  • first direct images of
  • magnetic monopoles
  • Image representing 12 micrometer x 12 micrometer of artificial magnetic metamaterial where monopoles can be seen at each end of the Dirac strings, visible as dark lines. The dark regions correspond to magnetic islands where the magnetization is reversed. (Image courtesy of Paul Scherrer Institute)
  • ...3 more annotations...
  • “A magnetic monopole is a ‘hypothetical’ particle that is a magnet with only one single magnetic pole,” says UCD Theoretical Physicist, Professor Hans-Benjamin Braun from the UCD School of Physics, who co-led the study with Dr Laura Heyderman from the Paul Scherrer Institute in Switzerland.
  • “Some of the most important theories explaining how quantum matter behaves in the universe are based on their existence, but they have eluded direct imaging since they were first theoretically conceived in the 1930s.”
  • Initially conceived by the British-Swiss theoretical physicist Dirac in 1931, monopoles were proposed to occur as emergent quasiparticles in so called pyrochlore spin-ice systems by Castelnovo, Moessner and Sondhi in 2008.
Jac Londe

Onera - 3 views

    la lumière, observation, détection, identification
Jac Londe

All Measures and Formulas - 48 views

    Everything you need to know about formats and calculations for all kinds of chemical elements and materials
1 - 19 of 19
Showing 20 items per page