Quadruple rainbow' caught on film for the first time - 1 views
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LeopoldS on 08 Oct 11Reminder of physics classes ...
If your wristwatch was as accurate as today’s atomic clocks, it would not gain or lose a second in 80 million years.
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Physics - The quantum shortcut to a solution - 1 views
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looks interesting - though not sure I would understand the full paper - do you have it?
Physics - Atoms in a lattice keep time - 0 views
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The NIST group traps and cools neutral 171Yb atoms and loads them into a one-dimensional lattice, so that about 30,000 atoms fill several hundred lattice sites.
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Lemke et al. compare their optical lattice clock with the current standard atomic fountain clock and find that the accuracy of the Yb lattice clock potentially challenges the current standard.
Physics - Nanospheres on a silver plate - 0 views
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As a result of its high symmetry and conjugated bond structure, the electronic properties of C60 are very unusual, and there is a massive research effort toward integrating it into molecular scale electronic devices [4].
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In this context, it is important to understand how the molecule forms bonds with a metal substrate, such as silver, which is commonly used as an electrode material.
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The general trend in all of these cases shows that even molecules with relatively weak individual (atom-to-atom) surface bonds can induce substantial substrate reconstructions in order to create favorable adsorption sites [8]. Such “nanopatterning” of substrates is essential to the stability of ordered structures of these molecules and can critically influence their electronic structure, which is an important aspect in the design of molecular electronic devices.
Experimental verification of the feasibility of a quantum channel between space and Earth - 0 views
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Extending quantum communication to space environments would enable us to perform fundamental experiments on quantum physics as well as applications of quantum information at planetary and interplanetary scales. Here, we report on the first experimental study of the conditions for the implementation of the single-photon exchange between a satellite and an Earth-based station. We built an experiment that mimics a single photon source on a satellite, exploiting the telescope at the Matera Laser Ranging Observatory of the Italian Space Agency to detect the transmitted photons. Weak laser pulses, emitted by the ground-based station, are directed toward a satellite equipped with cube-corner retroreflectors. These reflect a small portion of the pulse, with an average of less-than-one photon per pulse directed to our receiver, as required for faint-pulse quantum communication. We were able to detect returns from satellite Ajisai, a low-Earth orbit geodetic satellite, whose orbit has a perigee height of 1485 km.
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hello Jose! Interesting it was proposed to do the same with the ISS as part of the ACES experiment. I don't remember the paper but i can look if you're interested
Physics - Addressing the crowd - 0 views
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Setting up patterns by removing atoms from specific sites allows the team to watch in situ tunneling processes and microengineer novel atomic interactions.
Physics - Doing sums with swirls - 0 views
Virtual Teams - 0 views
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this might come very handy in case we explore further the idea of a virtual ACT - one of the key points: you still have to meet from time to time physically ...
Physics - Seeing without being seen - 0 views
Physics - Seeing without being seen - 0 views
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pacome is back! -
although we can't access the link;p
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oups i corrected this (up)
Papers by Alessandro Saffiotti - 0 views
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Employ of semantic knowledge as a source of information to PEIS (Physically Embedded Intelligent Systems)
http://perso.orange.fr/ebraw/ - 0 views
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this guy has a very personal and original opinion on physics.
Physics - spotlighting exceptional research - 0 views
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Highlights from PRL and Phys.Rev.
Physic Nobel prize 2008 - 0 views
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Delivered for work on broken symmetry
Twibright Optar - 0 views
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Optar stands for OPTical ARchiver. It's a codec for encoding data on paper. A proposal for fighting the digital obsolescence: Digital obsolescence is a situation where a digital resource is no longer readable because the physical media, the reader require
Physics - Power laws in chess - 3 views
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Finding power laws has now become de rigueur when analyzing popularity distributions. Long tails have been reported for the frequency of word usage in many languages [2], the number of citations of scientific papers [3], the number of visits (hits) to individual websites in a given time interval [4], and many more.
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Is there such a law for the technology used in satellites ?
Physics - Taking the wraps off cloaking - 0 views
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nice presentation...
Bio-Mimetic Approaches in Management Science, Book - Barnes & Noble - 1 views
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Oh yes somebody seems to have found a link between CMS and Biomimetics. Everything is possible now, even Fundamental physics !
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Neural networks = biomimetics. That's the conclusion from the TOC. It seems that biomimetics becomes the worse usurper than string theory.
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