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Commonly used terms in the Electrical industry.
ferroresonance
a resonant phenomenon involving inductance that varies with saturation. It can occur in a system through the interaction of the system capacitance with the inductance of, for example, that of an open-circuited transformer. Ferroresonance resembles, to some extent, the normal resonance that occurs wherever L-C circuits are encountered. If the capacitance is appreciable, ferroresonance can be sustaining or result in a limited over voltage enough to damage the cable or the transformer itself.
magnetic resonance imaging (MRI)
(1) a form of medical imaging with tomographic display that represents the density and bonding of protons (primarily in water) in the tissues of the body, based upon the ability of certain atomic nuclei in a magnetic field to absorb and reemit electromagnetic radiation at specific frequencies.
nuclear magnetic resonance
(2) an imaging modality that uses a pulsed radio frequency magnetic field to selectively change the orientation of the magnetization vectors of protons within the object under study. The change in net magnetic moment as the protons relax back to their original orientation is detected and used to form an image.
nuclear magnetic resonance
the phenomenon in which the resonant frequency of nuclear spin is proportional to the frequency of an applied magnetic field.
See
magnetic resonance imaging
resonance
in an RLC circuit, the resonance is the state at which the reactance of the inductor, X
L
, and the reactance of the capacitor, X
C
, are equal.
X
L
= 2πfL
X
C
= 1/(2πfC)
resonance fluorescence
the modified fluorescence produced when a quantum mechanical system is strongly driven by one or more near-resonant electromagnetic fields.
subsynchronous resonance
an electric power system condition where the electric network exchanges energy with a turbine generator at one or more of the natural frequencies of the combined system below the synchronous frequency of the system.