Wikipedia:Featured picture candidates/delist/Meissner effect.jpg

Meissner effect
[[:Image:Meissner effect.jpg|thumb|200px|Meissner effect using a high-temperature superconductor and powerful Rare-earth magnet.

"In the late 1980s, Pacific Northwest National Laboratory researchers conducted research into superconductors. The ceramic superconductors are made from a material that has only very low alternating-current resistance and thus dissipates less power. Magnetic forces between the magnet and ceramic superconductor provide a magnetic cushion that keeps the magnet suspended above the superconductor. Liquid nitrogen cools the superconductor to about 77 Kelvin, producing the magnetic cushion." From the Pacific northwest national lab. March 1987.]]
 * Reason:Not available with a free license. Copyright status at PNNL website states that documents may be used for non-commercial, scientific and educational use. Papa November (talk) 16:10, 28 January 2008 (UTC)
 * Nominator: Papa November (talk)


 * Delist &mdash; Papa November (talk) 16:10, 28 January 2008 (UTC)
 * Comment - How did this go from public domain to unfree license? I've been going through the history and I'm not exactly sure how that happened. May you explain it first? -- ZeWrestler   Talk 17:12, 28 January 2008 (UTC)
 * Wikipedia's image use policy only considers images to be "free" if they are also free for commercial use. This image was produced by the PNNL, and although it is a US federal government institution it states on its website that all its documents are for non-commercial use only.  This has been noted previously at Template talk:PD-USGov-DOE. Papa November (talk) 17:31, 28 January 2008 (UTC)

MER-C 02:59, 29 January 2008 (UTC)