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doughnut |
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doughnut (esp US), donut
anything shaped like a ring, such as the reaction vessel of a thermonuclear reactor doughnut [′dō‚nət] (nucleonics) Also spelled donut. The toroidal vacuum chamber in which electrons are accelerated in a betatron or synchrotron. Also known as toroid. An assembly of enriched fissionable material, often doughnut-shaped, used in a thermal reactor to provide a local increase in fast neutron flux for experimental purposes. (petroleum engineering) A ring of wedges or a threaded, tapered ring that supports a pipe string. concrete collar, doughnut A collar of reinforced concrete which is placed around an existing column so that it can be jacked up; the shrinkage of the concrete causes it to grip the column firmly. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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