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 ?
McPhee, who had been complaining of black-outs, fled after the crash leaving Mr Brown, front seat passenger Mavis Lewin and her mother Doris Cameron injured at the scene.
The illness meant he had to switch to a fast-acting insulin pump four years ago to control the "hypos" - attacks resulting from low blood sugar levels that sometimes led to black-outs.
Because of all this, there have been frequent black-outs.
Minister Chacon at the time apologised for the black-outs and congratulated Venezuelans for their calm despite the opposition's "de-stabilising efforts".
She added they will be holding talks with the state company to stop further black-outs.
Minister Chacon then apologised for the black-outs and congratulated Venezuelans for their calm despite the opposition's "destabilising efforts".
The latest controversy follows a series of black-outs this season and The Mirror yesterday received a number of calls alleging a Far East betting syndicate had placed heavy money on the outcome of the match.
Billboards extol a "natural gas revolution" and the prowess demonstrated by a satellite put into orbit last year with China's assistance, while daily black-outs plague poor areas where the satellite was supposed to help provide phone and Internet services.
Basic goods are scarce, inflation is raging at 160% per annum, and power black-outs are common.
The lawsuit alleges that the NHL's rules establishing local broadcast territories for NHL teams and associated black-outs violated federal antitrust laws.
By 2017-2018, there will be an end to load shedding," he said, referring to a system of rolling black-outs used to ration electricity.
Dr Edward Owens of the Energy Academy at Heriot-Watt University said, This technology will help achieve progress towards meeting EU targets for reducing emissions by increasing use of renewable energy and will spread energy consumption out to avoid the peaks that put power grids under stress and can lead to black-outs.