ultraharmonic oscillation - ορισμός. Τι είναι το ultraharmonic oscillation
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Τι (ποιος) είναι ultraharmonic oscillation - ορισμός

Self oscillation; Self-exciting oscillation; Self‑oscillation; Self-oscillator
  • Schematic representation of a self-oscillation as a positive feedback loop.  The oscillator ''V'' produces a feedback signal ''B''.  The controller at ''R'' uses this signal to modulate the external power ''S'' that acts on the oscillator.  If the power is modulated in phase with the oscillator's velocity, a negative damping is established and the oscillation grows until limited by nonlinearities.

Self-oscillation         
Self-oscillation is the generation and maintenance of a periodic motion by a source of power that lacks any corresponding periodicity. The oscillator itself controls the phase with which the external power acts on it.
Neutral particle oscillation         
TRANSMUTATION OF A PARTICLE WITH ZERO ELECTRIC CHARGE INTO ANOTHER NEUTRAL PARTICLE DUE TO A CHANGE OF A NON-ZERO INTERNAL QUANTUM NUMBER
Neutral particle oscillations; Meson oscillations; Meson oscillation; Neutral meson mixing; Neutron–antineutron oscillation; Neutron-antineutron oscillation
In particle physics, neutral particle oscillation is the transmutation of a particle with zero electric charge into another neutral particle due to a change of a non-zero internal quantum number, via an interaction that does not conserve that quantum number. Neutral particle oscillations were first investigated in 1954 by Murray Gell-mann and Abraham Pais.
Bounded mean oscillation         
REAL-VALUED FUNCTION WHOSE MEAN OSCILLATION IS BOUNDED
Fefferman duality theorem; Vanishing mean oscillation; Mean oscillation; John-Nirenberg Inequality; John–Nirenberg inequality; John-Nirenberg inequality
In harmonic analysis in mathematics, a function of bounded mean oscillation, also known as a BMO function, is a real-valued function whose mean oscillation is bounded (finite). The space of functions of bounded mean oscillation (BMO), is a function space that, in some precise sense, plays the same role in the theory of Hardy spaces Hp that the space L∞ of essentially bounded functions plays in the theory of Lp-spaces: it is also called John–Nirenberg space, after Fritz John and Louis Nirenberg who introduced and studied it for the first time.

Βικιπαίδεια

Self-oscillation

Self-oscillation is the generation and maintenance of a periodic motion by a source of power that lacks any corresponding periodicity. The oscillator itself controls the phase with which the external power acts on it. Self-oscillators are therefore distinct from forced and parametric resonators, in which the power that sustains the motion must be modulated externally.

In linear systems, self-oscillation appears as an instability associated with a negative damping term, which causes small perturbations to grow exponentially in amplitude. This negative damping is due to a positive feedback between the oscillation and the modulation of the external source of power. The amplitude and waveform of steady self-oscillations are determined by the nonlinear characteristics of the system.

Self-oscillations are important in physics, engineering, biology, and economics.