Magnet World

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Mark
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Magnet World

Post by Mark » Tue Jan 29, 2008 3:47 am

I feel so romantic watching this. ha
http://www.youtube.com/watch?v=T9j2ARTftkg
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Jim Berquist
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Post by Jim Berquist » Thu Jan 31, 2008 4:22 am

Mark your Strange. Cool But Strange! :roll:
WHAT TO FRAP, IT WORKED![url=callto://james.a.berquist]Image[/url]

Mark
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Magnet World

Post by Mark » Thu Jan 31, 2008 10:46 am

While I like abstract thought/associations, the song and his statement combined, "Two homopolar rotating cart built with neodymium magnets drawn from a soul of iron," seemed a bit incongruent/flowery.
Surely this is the duet/song he should have chosen. "With you I'm not shy, to show the way I feel, my secrets to reveal, for you are a magnet and I am the steel... "
I like sensitive scientific analogies, don't get me wrong. ha
http://www.youtube.com/watch?v=1GYyEaQnT60
Last edited by Mark on Thu Jan 31, 2008 5:28 pm, edited 1 time in total.
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Magnet World

Post by Mark » Thu Jan 31, 2008 4:13 pm

Just the last part shows a curious thing, I posted a similar effect prior, shown in a previous link. I wonder if atoms are like that. ha
http://www.youtube.com/watch?v=8KN7LUhlUow
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Rail Gun

Post by Jim Berquist » Sat Feb 02, 2008 1:57 am

WHAT TO FRAP, IT WORKED![url=callto://james.a.berquist]Image[/url]

Mark
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Magnet World

Post by Mark » Thu Mar 20, 2008 1:51 am

http://www.magnet.fsu.edu/magnettechnol ... helix.html


Request Magnet Time
"The procedures for applying for magnet time, as well as the review processes for those applications, vary by program." ha

http://www.magnet.fsu.edu/videos/overvi ... nhmfl.html
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Mark
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Magnet World

Post by Mark » Mon Mar 31, 2008 1:05 am

How is a magnetic field used for cooling?

"Magnetic cooling technology exploits the fact that when a magnetic material, in this case the element gadolinium, is magnetised, heat is produced as a by-product of entropy. The principle of entropy is that there will always be a constant amount of order/disorder in a substance. When the magnet puts the substance in “order”, it has to get rid of the excess disorder – and this becomes heat. Conversely, when the magnetic field is again removed, the substance becomes cold."
http://www.physorg.com/news107183785.html
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larry cottrill
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Re: Magnet World

Post by larry cottrill » Mon Mar 31, 2008 11:31 am

Mark -

What I especially appreciated was the comment that this project was "completed in 2007 at the conceptual level." Man, you don't know how many projects I've been able to finish up in just that same way!

L Cottrill

Mark
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Magnet World

Post by Mark » Mon Mar 31, 2008 1:55 pm

Wiki tidbits.
"Gadolinium demonstrates a magnetocaloric effect whereby its temperature increases when it enters a magnetic field and decreases when it leaves the magnetic field. The effect is considerably stronger for the gadolinium alloy Gd5(Si2Ge2) [1]."
"Furthermore, gadolinium's high magnetic moment and low Curie temperature (which lies just at room temperature) suggest applications as a magnetic component for sensing hot and cold.
http://en.wikipedia.org/wiki/Gadolinium

(For release: December 7, 2001)
"According to Gschneidner, who is also an Anson Marston Distinguished Professor of materials science and engineering at Iowa State University, the magnetic refrigerator employs a rotary design. It consists of a wheel that contains segments of gadolinium powder – supplied by Ames Laboratory – and a high-powered, rare earth permanent magnet."

"The wheel is arranged to pass through a gap in the magnet where the magnetic field is concentrated. As it passes through this field, the gadolinium in the wheel exhibits a large magnetocaloric effect – it heats up. After the gadolinium enters the field, water is circulated to draw the heat out of the metal. As the material leaves the magnetic field, the material cools further as a result of the magnetocaloric effect. A second stream of water is then cooled by the gadolinium. This water is then circulated through the refrigerator’s cooling coils. The overall result is a compact unit that runs virtually silent and nearly vibration free, without the use of ozone-depleting gases, a dramatic change from the vapor-compression-style refrigeration technology in use today."
"Sasha Pecharsky and Vitalij Pecharsky have developed a process for producing kilogram quantities of Gd5(Si2Ge2) alloy using commercial-grade gadolinium. Gd5(Si2Ge2) exhibits a giant magnetocaloric effect which offers the promise to outperform the gadolinium powders used in the current rotary refrigerator."
http://www.external.ameslab.gov/news/re ... refrig.htm
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Add a bike gen

Post by Jim Berquist » Sat Apr 05, 2008 1:12 am

WHAT TO FRAP, IT WORKED![url=callto://james.a.berquist]Image[/url]

Mark
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Magnet World

Post by Mark » Mon Apr 14, 2008 1:22 am

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Mark
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Magnet World

Post by Mark » Mon Apr 14, 2008 3:33 am

... wrong subject
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Magnet World

Post by Mark » Thu Apr 24, 2008 1:36 am

"The combinatorial possibilities for four or more elements are so vast that we have barely scratched the surface, despite efforts to automate the search."
"Most crucially, the 'iron oxypnictides' show that high-temperature conductivity is not the sole preserve of copper oxides. As in that case, superconductivity in the new materials seems to be related to magnetic behaviour. But quite how this works has remained a mystery. With an entirely new family of compounds to play with, the mechanism might be persuaded to start giving up some secrets. With a theory to hand, 'designer superconductors' with much higher transition temperatures might not look like a fool's quest. There could be another Nobel prize in that. For now, it is enough that the oxy-pnictides have set the community buzzing in a way that recalls the last heyday of superconductors two decades ago."
http://www.nature.com/nature/journal/v4 ... 2914a.html
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Re: Magnet World

Post by Mark » Sat Jun 07, 2008 11:09 am

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Re: Magnet World

Post by Mark » Sat Aug 09, 2008 11:58 pm

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