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in title, tags, annotations or urlExperimental 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
A curvy, stretchy future for electronics - PNAS - 0 views
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Electronics of the future will be soft and rubbery.
'Terrorist Facebook' - the new weapon against al-Qa'ida - World Politics, World - The Independent - 0 views
Animal personalities: Unnatural selection | The Economist - 0 views
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the first time that differences in personality have been shown in wild birds
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hese analyses are based on the assumption that the animals collected represent a randomly selected and thus representative sample of the population.
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Instead it looks as if such trapping studies are selecting the bravest individuals.
Why microbes are smarter than you thought - life - 30 June 2009 - New Scientist - 0 views
Report: Planets will collide in 5 billion years - 0 views
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Mercury, Mars, Venus and Earth to smash into each other, either one at a time or all at once
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by the end of that same 5 billion years the sun will have burned up its hydrogen and in a cooler state will inflate itself
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the great "gas giants" of the outer solar system - Jupiter, Saturn, Uranus and Neptune - are extremely stable in their orbits, so they could remain where they are for a much longer time
Microalgae As A Source Of Alternative Energy - 0 views
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That's very interesting. The algae can be used as an absorber of CO2. The problem is that in order to be efficient it has to cover a wide surface and needs water. Would it be possible to grow algaes in the clouds...? Do you know some plants that are capable of floating in the air ?
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Yes. There are some epiphytic plants who do not have roots and remove CO2 and H2O from air. Oisin is doing some calculations on it.
Cockroaches accept little robots - 0 views
nature01941.pdf (application/pdf Object) - 0 views
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