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Domain: nbi.dk

Stories and comments across the archive that link to nbi.dk.

Comments · 16

  1. Re:Wait... by GargamelSpaceman · · Score: 1 · on The LHC, the Higgs Boson, and the Chicago Cubs

    If you read Nielsen's page, he's interested in the possibility that the physical laws might be so enormously complex that they would appear random, but they are such that in the limit they appear to conform to the familiar ones we know. So I don't think this is time travel, but more like, the physical laws of the universe ALWAYS WERE such that Higgs Bosons are not created. Nothing 'reached back in time' to perturb the minds of the Congresspeople into Scuttling the Superconducting Supercollider. The laws of the universe are just such that the minds of the Congresspeople were perturbed when they had to be in order to scuttle the SSC.

    Possibly different physical laws ( which have not changed ) caused the LHC to have problems.

    Of course this is only what I think the argument is. I have no idea if A) I am right in my interpretation, or B) if the argument holds water. But it is interesting.

    This page was linked to from Holger Nielsen's web page

  2. Re:The language of engineers by infolib · · Score: 1 · on Learn a Foreign Language As an Engineer?

    Bohr was Danish. His correspondence is in Danish, English, German, French and Swedish.

    As far as physics goes there's only sense in learning languages other than English (and maybe Russian, French or Japanese for a few obscure articles) if you're interested in history. The final polished version of a theory is easier to get from textbooks.

  3. Re:technologies using UHF waves by repapetilto · · Score: 1 · on Hearing Voices? Could Be the Lasers

    Also, this is really interesting considering this theory

  4. Re:Both are wrong. by AxelBoldt · · Score: 1 · on Scientists Say Nerves Use Sound, Not Electricity

    So if these guys claim that biology and medical textbooks talk about electrical impulses, maybe they need to get some real textbooks first
    The CBC summary is garbage. Much better articles are here and here.
  5. Re:I doubt that! by AxelBoldt · · Score: 1 · on Scientists Say Nerves Use Sound, Not Electricity

    So somebody said nerve signals are sent by sound and not electrical impulses? Tell that to the people who regain hearing thanks to cochlear implants
    The authors propose that the solitons carrying the signal in the nerve cell's membrane are created and detected piezo-electrically. Here's a better writeup.
  6. Re:On to the net nerve by AxelBoldt · · Score: 2, Insightful · on Scientists Say Nerves Use Sound, Not Electricity

    we listen to brain waves with an EEG or MEG, which measure minute electrical or magnetic impulses.
    As a soliton travels down a membrane, the density and thickness change. Since the membrane is full of charged and polar molecules, changing its density and thickness will generate an electric signal that can be detected.

    If sound propagation were the key, all that sodium and potassium gating to change the local membrane charge would be useless,
    No, because the sound wave is assumed to be created piezo-electrically. But it's true, in a sound model the cell has to do a lot less ion pumping; it's much more energy efficient.

    Did you know that it has been observed that the thickness of the axon's membrane changes as the nerve impulse moves through? This is a nice writeup.

  7. An article by one of the members of the res. group by Inf0phreak · · Score: 1 · on Scientists Say Nerves Use Sound, Not Electricity
    They wrote an article on their research in the previous edition of Gamma (the quarterly (IIRC) thingie about physics that's published at the Niels Bohr Institute at the University of Copenhagen (help me out here Danish physics students... I'm not too sure on the specifics of who is responsible and what its scope is))

    Anyway, you can read that article in its entirety here: http://www.gamma.nbi.dk/Galleri/gamma143/nerves.pd f

    IANANS (guess...) but I do find it very agreeable that it is odd that strength of an aneastaesia (yeah, it's misspelled) is proportional to its solubility in lipids if the inner workings of nerves are driven by electricity.

  8. Re:Well it clearly matters to some people... by infolib · · Score: 1 · on Good bye Dark Matter, Hello General Relativity
    We live in Canada, and actually won a trip to Switzerland this summer. We went to Geneva and rode the #9 down to CERN. Couldn't get a tour booked in under a year, never mind the few months we had, unfortunately, and when we got there, even the Microcosm exhibit was closed, so my attempts at getting to a scientific "mecca" were foiled (though I did eat in the cafe and had the Menu Proton special :)

    I've seen the exhibit and you didn't miss very much except maybe the chance to buy souvenirs. When I went there we managed to see quite non-public stuff through a combination of the right contacts and downtime from a power-outage :-) If I'm lucky I might get the chance to go again and see the LHC detectors before the beams are switched on.

    There are so many things over there - it's a shame we're at such a distance. At least my fiancée-soon-to-be-wife, who's a high school science teacher, has a lot of Danish heritage - which might make a good excuse to visit. I trust you don't have to book campus tours or anything too far in advance? :)

    When you know you're going, try to contact the Niels Bohr Archive. They might be willing to show you a couple of the interesting rooms and tell funny anecdotes. You can also drop me a slashdot message. I don't know how long I'll be staying at the institute but if nothing else I might have suggestions on how to get in and who to talk to.

  9. A simple proof by infolib · · Score: 1 · on Evidence of 6 Dimensions or More?
    that 1+2+3+... = -1/12. (The proof starts at p. 2 bottom) This "proof" uses nothing but 1st year university analysis. Unfortunately the version i found is in danish, but it's sufficiently formula-dense that it can be followed by anyone with some mathematical training.

    The result is of course wrong, but it (or its equivalent) is actually used for renormalizing quantum field theories to get rid of ugly infinities. Don't ask me what's happening here, I just use the results :-)

  10. Re:Got Mirror ? iop by Anonymous Coward · · Score: 0 · on Beware The Rotundus Rover

    yes

  11. Re:is this real? by Welpa · · Score: 5, Informative · on Diary Illuminates Einstein's Last Years

    Actually, this is not so unbelievable. Heisenberg apparently did believe that Germany would win and was working on developing the atomic bomb for Hitler.

    There has been a lot of attention devoted to a meeting, in 1941, between Heisenberg and Niels Bohr, a Danish physicist, in occupied Copenhagen. There has even been a play about it, called "Copenhagen".

    You can read some documents about the meeting here .

  12. Re:Just saw it on TV by global_diffusion · · Score: 2, Interesting · on Followup To Bohr-Heisenberg Meeting

    Bohr didn't believe an atomic bomb was possible.

    In this draft of a letter to Heisenberg, Bohr said that he had known about the possibility of a bomb for about three years.

    Who else thought this was really sad? I makes me sick to see physics caught up in such horrible politics.

  13. blantant by spudwiser · · Score: 1 · on Followup To Bohr-Heisenberg Meeting

    http://www.nba.nbi.dk all linked up and pretty.

  14. Re:Just saw it on TV by blamanj · · Score: 2 · on Followup To Bohr-Heisenberg Meeting

    Well, trust TV to get it wrong. If you read the letters, Bohr claims that had been obvious to him a few years earlier that a bomb was theoretically possible.

  15. Niles Bohr was Danish by Zuul · · Score: 1 · on Star In A Jar

    Yes, Denmark is a part of Scandinavia, as it is a part of Europe. I'm wondering if you think Scandinavia is a country, because it's not.

    Anyways the Niels Bohr Institute for Astronomy, Physics and Geophysics is in Copenhagen Denmark.

  16. You're so full of... by Rabenwolf · · Score: 2 · on Star In A Jar
    some of which I have been analysing at the Neils Bohr Institute in Kaiserslautern, Germany

    Nice attempt at a troll, but you should at least try to get your stuff consistent. There is no Neils Bohr Institute in Germany. It is the Niels Bohr institute (site is here) and it is in Copenhagen, Denmark.


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