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.
References in periodicals archive ?
One study that CVS Caremark conducted with Brigham & Women's Hospital in Boston found that beneficiaries who had to pay the full cost of brand-name medications when they hit the doughnut hole were twice as likely to stop taking them altogether than to switch to generics.
This rule implies that the doughnut hole in Figure 1 will hardly provide incentives for cost containment to consumers whose expected expenses (far) exceed that doughnut hole.
Tavenner: About 8 million Medicare beneficiaries are expected to reach the prescription drug coverage gap that we call the doughnut hole this year.
The first rebate checks were sent in June, and checks will be sent each month throughout this year as more beneficiaries enter the doughnut hole.
Starting in 2007, when most participants will be enrolled for the full year, the doughnut hole will transfer costs of about $20 billion to beneficiaries--these are costs beneficiaries will have to cover out of pocket, thanks to the doughnut hole.
Premiums, deductibles, and the doughnut hole will be "indexed," meaning they could increase each year.
Jose Angel Conchello Davila for pushing the government to claim Mexico's rights to hydrocarbons in the doughnut hole.
People with Medicare in the doughnut hole now receive discounts when they purchase prescription drugs at a pharmacy or order them through the mail, until they reach the catastrophic coverage phase.
As an agent, I have seen horrible poverty, heard the near-death stories because people can't afford their meds when in the doughnut hole.
van Vliet note in "Risk-Adjusting the Doughnut Hole to Improve Efficiency and Equity," a key issue for policymakers concerns the appropriate level of medical spending to locate the doughnut hole in order to obtain the strongest incentives for cost containment.
Under ACA, the administration aims to close the doughnut hole by 2020.