blackout

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blackout

1. a momentary loss of consciousness, vision, or memory
2. a temporary electrical power failure or cut
3. Electronics a temporary loss of sensitivity in a valve following a short strong pulse
4. a temporary loss of radio communications between a spacecraft and earth, esp on re-entry into the earth's atmosphere

blackout

[′blak‚au̇t]
(communications)
(electricity)
The shutting off of power in an electrical power transmission system, either deliberately or through failure of the system.

blackout

blackoutclick for a larger image
The relationship between acceleration and time at maximum G required to produce symptoms of grayout and blackout.
i. A condition of temporary loss of vision, possibly also loss of consciousness, resulting from the effect of high and sustained positive acceleration (g) on the body. A condition that occurs at g value higher than 1 that causes gray-out. Normally, this occurs when the body is exposed to +4 and +4.5 g for about 10 seconds or more. This can be postponed slightly by using a g-suit, by crouching, or by using a reclining seat. The onset of gray-out and blackout conditions varies from individual to individual. It is also dependent on physical conditioning.
ii. The fadeout of radio communications caused by changes in the ionosphere resulting from a nuclear explosion or ionospheric disturbances.
iii. An enforced period during which all lights in an area are turned off or concealed, so as not to be visible from the air. It is one of the passive air defense measures.

blackout

A complete loss of power. See brownout.
References in periodicals archive ?
As the long hot summer progresses, the black-outs are bound to increase, making life harder and less productive.
She spent her married life caring for her husband, Donato, who suffered from epilepsy and was plagued by terrifying fits and black-outs.
Though meant to be performed in sequence with short black-outs between each, they can be mixed, matched, or rearranged in any form the director likes.
BRITAIN could face widespread black-outs unless there is urgent investment in a new fleet of gas-fired power stations, MPs warned last night.
Roberta Hemmings said her son, who divorced 25 years ago, suffered from black-outs after a cycling accident about three years ago.
BLACK-OUTS affecting thousands of homes in south Warwickshire caused chaos in Stratford, Warwick and Kenilworth last night.
As a means of remedying the frequent black-outs and various electricity generation problems, Government has passed a motion that will convert the money owed by the BVI Electricity Corp.
He said Mrs Brain and her husband had struggled to shake off symptoms of vomiting, headaches and black-outs over a two-year period.
Typically headed by the camp director, this is a team of people who plan and initiate the camp's response to both external threats like forest fires and electrical black-outs, and internal threats such as a lost camper or severe weather plan.
Such devices, in turn, could spawn such payoffs as electric-transmission grids less vulnerable to power loss and black-outs, military radar with longer ranges and higher precision, and electric vehicles with improved performance, as compared with current versions.
It causes a problem with the blood supply to the body which stops the heart and causes black-outs and fainting.
Another 3,000 homes in EAST YORKSHIRE suffered black-outs.