How many types of perturbation are there?
Time-independent perturbation theory is one of two categories of perturbation theory, the other being time-dependent perturbation (see next section).
What is harmonic perturbation?
Harmonic perturbation is a rare special case of time-dependent perturbations in which exact analysis exists. Some important technology advances, such as masers, lasers, nuclear magnetic resonance, etc., originated from it.
What do you mean by Stark effect?
Stark effect, , the splitting of spectral lines observed when the radiating atoms, ions, or molecules are subjected to a strong electric field. The electric analogue of the Zeeman effect (i.e., the magnetic splitting of spectral lines), it was discovered by a German physicist, Johannes Stark (1913).
What is planetary perturbation?
perturbation, in astronomy, deviation in the motion of a celestial object caused either by the gravitational force of a passing object or by a collision with it.
What is the event-related spectral perturbation?
A new measure of event-related brain dynamics, the event-related spectral perturbation(ERSP), is introduced to study event-related dynamics of the EEG spectrum induced by, but not phase-locked to, the onset of the auditory stimuli.
What is an event-related EEG amplitude change?
A well-known example of an event-related EEG amplitude change is the reduction in occipital alpha-band EEG amplitude that normally occurs when the eyes are opened.
What is an event-related potential (ERP)?
By averaging response epochs timelocked to a number of similar events, rhythmic or quasi-rhythmic brain activity not exactly synchronized in bothtime and phase to the experimental events is averaged out through phase cancellation, and the coherent time-and-phase-locked activity that remains is called an event-related potential(ERP).
What does spectral mean?
Spectral is an American military science fiction action film directed by Nic Mathieu. The screenplay was written by Ian Fried, Mathieu and George Nolfi from a screen story by Fried.