Fysikk

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Re: Fysikk

Innlegg Panther 08 Jun 2012, 14:41

Veldig interessant artikkel.

http://phys.org/news/2012-06-physicists-atom-quantum-mechanics-precision.html

Physicists split an atom using quantum mechanics precision


Researchers from the University of Bonn have just shown how a single atom can be split into its two halves, pulled apart and put back together again. While the word "atom" literally means "indivisible," the laws of quantum mechanics allow dividing atoms - similarly to light rays - and reuniting them. The researchers want to build quantum mechanics bridges by letting the atom touch adjacent atoms while it is being pulled apart so that it works like a bridge span between two pillars. The results have just been published in the journal Proceedings of the National Academy of Sciences.
Ken-G. Johansen.
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Re: Fysikk

Innlegg QIQrrr 02 Jul 2012, 22:31

Nature, July 2, 2012: Physicists in Europe will present evidence of an entirely new particle on Wednesday, Nature has learned. But more data will be needed to officially confirm whether it is indeed the long-awaited Higgs boson — the particle thought to be behind the mass of all the others - Physicists find new particle, but is it the Higgs?

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"Atlas was permitted the opinion that he was at liberty, if he wished, to drop the Earth and creep away; but this opinion was all that he was permitted" - Franz Kafka
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Re: Fysikk

Innlegg QIQrrr 05 Jul 2012, 11:34

Griffith University, July 3, 2012: In an international scientific breakthrough, a Griffith University research team has been able to photograph the shadow of a single atom for the first time. "We have reached the extreme limit of microscopy; you cannot see anything smaller than an atom using visible light," Professor Dave Kielpinski of Griffith University's Centre for Quantum Dynamics in Brisbane. "We wanted to investigate how few atoms are required to cast a shadow and we proved it takes just one," Professor Kielpinski said. Published this week in Nature Communications, "Absorption imaging of a single atom" is the result of work over the last 5 years by the Kielpinski/Streed research team - World's first single atom photo

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"Atlas was permitted the opinion that he was at liberty, if he wished, to drop the Earth and creep away; but this opinion was all that he was permitted" - Franz Kafka
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Re: Fysikk

Innlegg QIQrrr 08 Sep 2012, 21:13

University of Toronto, September 7, 2012: Researchers at the University of Toronto have demonstrated that theoretical physicist Werner Heisenberg was too pessimistic in 1927 when formulating his famous uncertainty principle. The Heisenberg uncertainty principle is one of the cornerstones of quantum mechanics. In its most familiar form, it says that it is impossible to measure anything without disturbing it. For instance, any attempt to measure a particle's position must randomly change its speed. The principle has bedeviled quantum physicists for nearly a century, until recently, when researchers at U of T demonstrated the ability to directly measure the disturbance. [...] The findings are reported in the paperViolation of Heisenberg's Measurement-Disturbance Relationship by Weak Measurements” - U of T scientists cast doubt on the uncertainty principle
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"Atlas was permitted the opinion that he was at liberty, if he wished, to drop the Earth and creep away; but this opinion was all that he was permitted" - Franz Kafka
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