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[Techspot] Quantum Levitation Demonstration - Page 6

post #51 of 61
Quote:
Originally Posted by guyladouche View Post
Not the same thing by any means. It's similar, in that you need a superconductor, and that it's interacting with the magnetic fields of a magnetic object, however beyond that it's totally different. In the "historical" depiction, the magnetic fields in the superconductor induced by the bulk magnet oppose the magnetic fields of the bulk magnet and repel the bulk magnet. The bulk magnet can have only one preferred orientation above the supercooled superconductor--if you move the magnet, it reorients against the superconductor, but is still being repelled--there is a net opposing force between the two bodies, and the magnet only seems to hover because that's the equilibrium point between the forces induced by the magnetic fields, and by the force due to gravity. In the new breakthrough, the superconductor is combined, amongst other things, with a sapphire crystal layer, which allows a small amount of the magnetic fields from the bulk magnet to permeate through the superconductor, allowing what the person in the video described to be "locking." The superconductor is no longer hovering due to an equilibrium between magnetic and gravitational forces--it is held in place entirely by magnetic forces (or rather, the gravitational force becomes a small contribution). It's very very different.

Also different--that's just induced eddy currents causing localized magnetic fields that opposed the permanent magnet. Just because copper is not considered ferromagnetic doesn't mean it can't have induced magnetic fields for periods of time when a moving magnetic field is present.
I disagree. If my first video was the result of an equilibrium between gravity and the repulsive magnetic forces then why can the magnet be used to pick up the superconductor? If they really were repelling like you said then the magnet would simply lift off the superconductor and not bring the super conductor with it.

The entire reason any of this happens is because of induced eddy currents. Or at least that's how I understand it. As always, I'm open to being corrected. That just means I learned something new.

EDIT: Turns out I am wrong But so were you in some ways I found this description that is virtually what you said.

"In the Meissner effect, the superconductor that is placed within the magnetic field deflects the field entirely (see the image pictured here), such that none of the field passes through the object itself.

But as Hanson points out, the thinness of the superconductive coating featured in the quantum locking video allows for the magnetic field to penetrate it (albeit in discrete quantities) wherever there exist defects in the superconductor's molecular structure. This penetration gives rise to the "flux tubes" (again, pictured alongside Hanson's explanation), which pass through the inert crystal sapphire wafer and "trap" it in midair. This trapping provides the typically wobbly "levitation" characteristic of the Meissner effect a stiffer quality."

http://io9.com/5850729/quantum-locki...w-does-it-work
Edited by Epitope - 10/19/11 at 7:51am
    
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post #52 of 61

Why is this news? This is not a new concept at all and it has been demonstrated many times already.

Edit: so apparently this is a slightly different form of superconductivity. Would be nice if the source article explained why this is news.


Edited by Kirby1 - 10/19/11 at 7:51am
    
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post #53 of 61
Quote:
Originally Posted by Kirby1 View Post
Would be nice if the source article explained why this is news.
Exactly what I was thinking. The article and video do a very poor job of differentiating this from conventional messnier effect levitation.
    
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post #54 of 61
Quote:
Originally Posted by Kirby1 View Post
Why is this news? This is not a new concept at all and it has been demonstrated many times already.

Edit: so apparently this is a slightly different form of superconductivity. Would be nice if the source article explained why this is news.

http://www.youtube.com/watch?v=TeS_U9qFg7Y
That is not the same phenomenon, so yes, this is news.

EDIT: Didn't refresh page and see your edit.
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post #55 of 61
*sigh* yet another amazing technology that will never be used out side of a college lab.

I've gotten to the point where this kind of thing no longer amazes me. It is too expesive or inpractical for regular or industrial use so it will just be forgoten. We have to keep doing this or else we won't get the .0001% of inventions actually getting used, but it gets depressing knowing that even though I am pretty young yet I will never live to see this actually utilized. if it ever will.
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post #56 of 61
Quote:
Originally Posted by Epitope View Post
Not the same thing at all.
I never said it was.
 
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post #57 of 61
Quote:
Originally Posted by Vagrant Storm View Post
*sigh* yet another amazing technology that will never be used out side of a college lab.

I've gotten to the point where this kind of thing no longer amazes me. It is too expesive or inpractical for regular or industrial use so it will just be forgoten. We have to keep doing this or else we won't get the .0001% of inventions actually getting used, but it gets depressing knowing that even though I am pretty young yet I will never live to see this actually utilized. if it ever will.
I'm sure it will find all sorts of applications. I imagine that back in the 1800s when the electron was first discovered people were saying the same things you just said. "What use is it to me?"
    
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post #58 of 61
Can you overclock that thing?
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post #59 of 61
Quote:
Originally Posted by Shame486 View Post
Can you overclock that thing?
Stronger magnet and liquid helium!
    
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post #60 of 61
Quote:
Originally Posted by Epitope View Post
I disagree. If my first video was the result of an equilibrium between gravity and the repulsive magnetic forces then why can the magnet be used to pick up the superconductor? If they really were repelling like you said then the magnet would simply lift off the superconductor and not bring the super conductor with it.

The entire reason any of this happens is because of induced eddy currents. Or at least that's how I understand it. As always, I'm open to being corrected. That just means I learned something new.

EDIT: Turns out I am wrong But so were you in some ways I found this description that is virtually what you said.
Gah, you got me! Haha, I was too careless to watch until the end of the video to see them lift the superconductor. I will agree--same principle, achieved via different means--the meissner effect is present in your vid link because of unintended imperfections of the superconductor material type, whereas the materials in the new article/video are designed to have that effect. However, I agree, same principle. And I was also incorrect.

Good discussion!
    
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