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- etimologia
O que (quem) é xerographic reversal - definição
SIGNAL PROCESSING TECHNIQUE POPULAR IN ACOUSTICS, AND CURRENTLY BEING APPLIED TO ELECTROMAGNETICS, THAT RESULTS FROM THE REVERSAL IN TIME OF A SYSTEM'S RESPONSE SIGNAL
Time Reversal Signal Processing; Time reversal mirror
Geomagnetic reversal
![Geomagnetic polarity since the middle [[Jurassic]]. Dark areas denote periods where the polarity matches today's polarity, while light areas denote periods where that polarity is reversed. The ''Cretaceous Normal'' superchron is visible as the broad, uninterrupted black band near the middle of the image.](https://commons.wikimedia.org/wiki/Special:FilePath/Geomagnetic polarity 0-169 Ma.svg?width=200 "Geomagnetic polarity since the middle [[Jurassic]]. Dark areas denote periods where the polarity matches today's polarity, while light areas denote periods where that polarity is reversed. The ''Cretaceous Normal'' superchron is visible as the broad, uninterrupted black band near the middle of the image.")
![Geomagnetic polarity during the last 5 million years ([[Pliocene]] and [[Quaternary]], late [[Cenozoic Era]]). Dark areas denote periods where the polarity matches today's normal polarity; light areas denote periods where that polarity is reversed.](https://commons.wikimedia.org/wiki/Special:FilePath/Geomagnetic polarity late Cenozoic.svg?width=200 "Geomagnetic polarity during the last 5 million years ([[Pliocene]] and [[Quaternary]], late [[Cenozoic Era]]). Dark areas denote periods where the polarity matches today's normal polarity; light areas denote periods where that polarity is reversed.")
![magnetic field lines]], blue when the field points towards the center and yellow when away. The rotation axis of the Earth is centered and vertical. The dense clusters of lines are within the Earth's core.<ref name=Glatzmaier/>](https://commons.wikimedia.org/wiki/Special:FilePath/NASA 54559main comparison1 strip.gif?width=200 "magnetic field lines]], blue when the field points towards the center and yellow when away. The rotation axis of the Earth is centered and vertical. The dense clusters of lines are within the Earth's core.<ref name=Glatzmaier/>")
CHANGE OF DIRECTION OF EARTH MAGNETIC FIELD
Cretaceous Long Normal; Magnetic reversal; Magnetic polarity reversal; Polar reversal; Flipping of planetary magnetic poles; Geomagnetic Reversal; Cretaceous long normal; Earth's magnetic reversal; Pole reversal; Magnetic pole reversal; Magnetic Pole Flip; Geomagnetic reversals; Geomagnetic flip; Geomagnetic polarity time scale; Earth's polarity; Geomagnetic field reversal; Normal polarity; Polar Reverse; Superchron; Jurassic Quiet Zone; Cretaceous superchron; Cretaceous normal superchron; Magnetic reversals; Polarity reversal; Polar flip; Polarity transition; Cretaceous Quiet Zone; Reversal of magnetic fields; Geomagnetic polarity
A geomagnetic reversal is a change in a planet's magnetic field such that the positions of magnetic north and magnetic south are interchanged (not to be confused with geographic north and geographic south). The Earth's field has alternated between periods of normal polarity, in which the predominant direction of the field was the same as the present direction, and reverse polarity, in which it was the opposite.
reversal
WIKIMEDIA DISAMBIGUATION PAGE
Reversed; Reversal (disambiguation)
(reversals)
1.
A reversal of a process, policy, or trend is a complete change in it.
The Financial Times says the move represents a complete reversal of previous US policy...
N-COUNT: oft N of n
2.
When there is a role reversal or a reversal of roles, two people or groups exchange their positions or functions.
When children end up taking care of their parents, it is a strange role reversal indeed.
N-COUNT: n N, N of n
Reversal
WIKIMEDIA DISAMBIGUATION PAGE
Reversed; Reversal (disambiguation)
·adj Intended to reverse; implying reversal.
II. Reversal ·noun The act of reversing; the causing to move or face in an opposite direction, or to stand or lie in an inverted position; as, the reversal of a rotating wheel; the reversal of objects by a convex lens.
III. Reversal ·noun A change or overthrowing; as, the reversal of a judgment, which amounts to an official declaration that it is false; the reversal of an attainder, or of an outlawry, by which the sentence is rendered void.
Wikipédia
Time reversal signal processing
Time Reversal Signal Processing has three main uses: creating an optimal carrier signal for communication, reconstructing a source event, and focusing high-energy waves to a point in space. A Time Reversal Mirror (TRM) is a device that can focus waves using the time reversal method. TRMs are also known as time reversal mirror arrays since they are usually arrays of transducers. TRM are well-known and have been used for decades in the optical domain. They are also used in the ultrasonic domain.
