| http://www.w3.org/ns/prov#value | - The support structure 64 also serves as a thermal sink and ultra-high vacuum seal to a superconducting single walled metallic-type carbon nanotube 66 of relatively larger diameter, e.g. in the range of approximately 5 to 200 nanometers, which serves both as a field emission extraction electrode and as a miniature ultrahigh vacuum chamber.
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