142 relations: Aerodynamics, Aeroelasticity, Aircraft, Alternating current, Angle of attack, Antiresonance, Armstrong oscillator, Asteroseismology, Astronomy, Atlantic multidecadal oscillation, Attractor, Beat (acoustics), Belousov–Zhabotinsky reaction, BIBO stability, Blocking oscillator, Bray–Liebhafsky reaction, Briggs–Rauscher reaction, Business cycle, Butler oscillator, Cepheid variable, Chandler wobble, Christiaan Huygens, Circadian clock, Circadian rhythm, Clapp oscillator, Classical limit, Climate oscillation, Colpitts oscillator, Continuum mechanics, Critical speed, Crystal oscillator, Cycle (music), Cyclic model, Degrees of freedom (physics and chemistry), Delay-line oscillator, Double pendulum, Dynamical system, Dynamics (mechanics), Earthquake engineering, Ecology, Economics, El Niño–Southern Oscillation, Electrical resistance and conductance, Electromagnetic field, Electronic circuit, Electronic oscillator, Extended interaction oscillator, Feedback, Fluid, Force, ..., Foucault pendulum, Frequency, Friction, Function (mathematics), Generation gap, Geology, Geyser, Gravity, Harmonic oscillator, Hartley oscillator, Heart, Helioseismology, Helmholtz resonance, Hidden oscillation, Infinity, Insulin oscillation, Interval (mathematics), Kinetic energy, Laser, Lever escapement, Lift coefficient, Linearity, Local oscillator, Lotka–Volterra equations, Malthusianism, Mechanical equilibrium, Mercury beating heart, Momentum, Multivibrator, Musical instrument, Neural oscillation, Neuron, Neutral particle oscillation, Neutrino oscillation, Neutron-star oscillation, Normal mode, Open set, Oscillating gene, Oscillator (cellular automaton), Oscillator phase noise, Oscillistor, Pacific decadal oscillation, Pendulum, Periodic function, Phase noise, Phase-shift oscillator, Pierce oscillator, Pilot-induced oscillation, Place of articulation, Potential energy, Predation, Quantum harmonic oscillator, Quantum optics, Quasi-biennial oscillation, Real number, Reciprocating motion, Relaxation oscillator, Resonator, Reversible process (thermodynamics), Rhythm, RLC circuit, Royer oscillator, Seasonality, Self-oscillation, Self-pulsation, Sequence, Signal generator, Simple harmonic motion, Spring (device), Squegging, Statics, Stiffness, String instrument, String vibration, Structural stability, Swing (seat), Tension (physics), Time, Toda oscillator, Torsional vibration, Tuned mass damper, Tuning fork, Vackář oscillator, Vibration, Vibrator (mechanical), Water, Wavelength, Weight, Wien bridge oscillator, Wilberforce pendulum, Wing, 24-hour news cycle. Expand index (92 more) »

## Aerodynamics

Aerodynamics, from Greek ἀήρ aer (air) + δυναμική (dynamics), is the study of the motion of air, particularly its interaction with a solid object, such as an airplane wing.

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## Aeroelasticity

Aeroelasticity is the branch of physics and engineering that studies the interactions between the inertial, elastic, and aerodynamic forces that occur when an elastic body is exposed to a fluid flow.

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## Aircraft

An aircraft is a machine that is able to fly by gaining support from the air.

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## Alternating current

Alternating current (AC) is an electric current which periodically reverses direction, in contrast to direct current (DC) which flows only in one direction.

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## Angle of attack

In fluid dynamics, angle of attack (AOA, or \alpha (Greek letter alpha)) is the angle between a reference line on a body (often the chord line of an airfoil) and the vector representing the relative motion between the body and the fluid through which it is moving.

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## Antiresonance

In the physics of coupled oscillators, antiresonance, by analogy with resonance, is a pronounced minimum in the amplitude of one oscillator at a particular frequency, accompanied by a large shift in its oscillation phase.

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## Armstrong oscillator

The Armstrong oscillator (also known as the Meissner oscillator) is an electronic oscillator circuit which uses an inductor and capacitor to generate an oscillation.

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## Asteroseismology

Asteroseismology or astroseismology is the study of oscillations in stars.

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## Astronomy

Astronomy (from ἀστρονομία) is a natural science that studies celestial objects and phenomena.

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## Atlantic multidecadal oscillation

The Atlantic Multidecadal Oscillation (AMO) is a climate cycle that affects the sea surface temperature (SST) of the North Atlantic Ocean based on different modes on multidecadal timescales.

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## Attractor

In the mathematical field of dynamical systems, an attractor is a set of numerical values toward which a system tends to evolve, for a wide variety of starting conditions of the system.

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## Beat (acoustics)

In acoustics, a beat is an interference pattern between two sounds of slightly different frequencies, perceived as a periodic variation in volume whose rate is the difference of the two frequencies.

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## Belousov–Zhabotinsky reaction

A Belousov–Zhabotinsky reaction, or BZ reaction, is one of a class of reactions that serve as a classical example of non-equilibrium thermodynamics, resulting in the establishment of a nonlinear chemical oscillator.

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## BIBO stability

In signal processing, specifically control theory, bounded-input, bounded-output (BIBO) stability is a form of stability for linear signals and systems that take inputs.

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## Blocking oscillator

A blocking oscillator is a simple configuration of discrete electronic components which can produce a free-running signal, requiring only a resistor, a transformer, and one amplifying element.

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## Bray–Liebhafsky reaction

The Bray–Liebhafsky reaction is a chemical clock first described by William C. Bray in 1921 and the first oscillating reaction in a stirred homogeneous solution.

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## Briggs–Rauscher reaction

The Briggs–Rauscher oscillating reaction is one of a small number of known oscillating chemical reactions.

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## Business cycle

The business cycle, also known as the economic cycle or trade cycle, is the downward and upward movement of gross domestic product (GDP) around its long-term growth trend.

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## Butler oscillator

The Butler oscillator is a crystal-controlled oscillator that uses the crystal near its series resonance point.

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## Cepheid variable

A Cepheid variable is a type of star that pulsates radially, varying in both diameter and temperature and producing changes in brightness with a well-defined stable period and amplitude.

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## Chandler wobble

The Chandler wobble or variation of latitude is a small deviation in the Earth's axis of rotation relative to the solid earth, which was discovered by American astronomer Seth Carlo Chandler in 1891.

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## Christiaan Huygens

Christiaan Huygens (Hugenius; 14 April 1629 – 8 July 1695) was a Dutch physicist, mathematician, astronomer and inventor, who is widely regarded as one of the greatest scientists of all time and a major figure in the scientific revolution.

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## Circadian clock

A circadian clock, or circadian oscillator, is a biochemical oscillator that cycles with a stable phase and is synchronized with solar time.

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## Circadian rhythm

A circadian rhythm is any biological process that displays an endogenous, entrainable oscillation of about 24 hours.

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## Clapp oscillator

The Clapp oscillator is one of several types of LC electronic oscillator constructed from a transistor (or vacuum tube) and a positive feedback network, using the combination of an inductance with a capacitor for frequency determination.

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## Classical limit

The classical limit or correspondence limit is the ability of a physical theory to approximate or "recover" classical mechanics when considered over special values of its parameters.

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## Climate oscillation

A climate oscillation or climate cycle is any recurring cyclical oscillation within global or regional climate, and is a type of climate pattern.

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## Colpitts oscillator

A Colpitts oscillator, invented in 1918 by American engineer Edwin H. Colpitts, is one of a number of designs for LC oscillators, electronic oscillators that use a combination of inductors (L) and capacitors (C) to produce an oscillation at a certain frequency.

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## Continuum mechanics

Continuum mechanics is a branch of mechanics that deals with the analysis of the kinematics and the mechanical behavior of materials modeled as a continuous mass rather than as discrete particles.

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## Critical speed

In solid mechanics, in the field of rotordynamics, the critical speed is the theoretical angular velocity that excites the natural frequency of a rotating object, such as a shaft, propeller, leadscrew, or gear.

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## Crystal oscillator

A crystal oscillator is an electronic oscillator circuit that uses the mechanical resonance of a vibrating crystal of piezoelectric material to create an electrical signal with a precise frequency.

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## Cycle (music)

Cycle has several meanings in the field of music.

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## Cyclic model

A cyclic model (or oscillating model) is any of several cosmological models in which the universe follows infinite, or indefinite, self-sustaining cycles.

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## Degrees of freedom (physics and chemistry)

In physics, a degree of freedom is an independent physical parameter in the formal description of the state of a physical system.

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## Delay-line oscillator

A delay-line oscillator is a form of electronic oscillator that uses a delay line as its principal timing element.

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## Double pendulum

In physics and mathematics, in the area of dynamical systems, a double pendulum is a pendulum with another pendulum attached to its end, and is a simple physical system that exhibits rich dynamic behavior with a strong sensitivity to initial conditions.

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## Dynamical system

In mathematics, a dynamical system is a system in which a function describes the time dependence of a point in a geometrical space.

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## Dynamics (mechanics)

Dynamics is the branch of applied mathematics (specifically classical mechanics) concerned with the study of forces and torques and their effect on motion, as opposed to kinematics, which studies the motion of objects without reference to these forces.

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## Earthquake engineering

Earthquake engineering is an interdisciplinary branch of engineering that designs and analyzes structures, such as buildings and bridges, with earthquakes in mind.

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## Ecology

Ecology (from οἶκος, "house", or "environment"; -λογία, "study of") is the branch of biology which studies the interactions among organisms and their environment.

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## Economics

Economics is the social science that studies the production, distribution, and consumption of goods and services.

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## El Niño–Southern Oscillation

El Niño–Southern Oscillation (ENSO) is an irregularly periodic variation in winds and sea surface temperatures over the tropical eastern Pacific Ocean, affecting climate of much of the tropics and subtropics.

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## Electrical resistance and conductance

The electrical resistance of an electrical conductor is a measure of the difficulty to pass an electric current through that conductor.

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## Electromagnetic field

An electromagnetic field (also EMF or EM field) is a physical field produced by electrically charged objects.

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## Electronic circuit

An electronic circuit is composed of individual electronic components, such as resistors, transistors, capacitors, inductors and diodes, connected by conductive wires or traces through which electric current can flow.

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## Electronic oscillator

An electronic oscillator is an electronic circuit that produces a periodic, oscillating electronic signal, often a sine wave or a square wave.

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## Extended interaction oscillator

The extended interaction oscillator (EIO) is a linear-beam vacuum tube designed to convert direct current to RF power.

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## Feedback

Feedback occurs when outputs of a system are routed back as inputs as part of a chain of cause-and-effect that forms a circuit or loop.

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## Fluid

In physics, a fluid is a substance that continually deforms (flows) under an applied shear stress.

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## Force

In physics, a force is any interaction that, when unopposed, will change the motion of an object.

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## Foucault pendulum

The Foucault pendulum or Foucault's pendulum is a simple device named after French physicist Léon Foucault and conceived as an experiment to demonstrate the Earth's rotation.

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## Frequency

Frequency is the number of occurrences of a repeating event per unit of time.

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## Friction

Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.

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## Function (mathematics)

In mathematics, a function was originally the idealization of how a varying quantity depends on another quantity.

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## Generation gap

A generation gap or generational gap, is a difference of opinions between one generation and another regarding beliefs, politics, or values.

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## Geology

Geology (from the Ancient Greek γῆ, gē, i.e. "earth" and -λoγία, -logia, i.e. "study of, discourse") is an earth science concerned with the solid Earth, the rocks of which it is composed, and the processes by which they change over time.

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## Geyser

A geyser is a spring characterized by intermittent discharge of water ejected turbulently and accompanied by steam.

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## Gravity

Gravity, or gravitation, is a natural phenomenon by which all things with mass or energy—including planets, stars, galaxies, and even light—are brought toward (or gravitate toward) one another.

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## Harmonic oscillator

In classical mechanics, a harmonic oscillator is a system that, when displaced from its equilibrium position, experiences a restoring force, F, proportional to the displacement, x: where k is a positive constant.

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## Hartley oscillator

The Hartley oscillator is an electronic oscillator circuit in which the oscillation frequency is determined by a tuned circuit consisting of capacitors and inductors, that is, an LC oscillator.

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## Heart

The heart is a muscular organ in most animals, which pumps blood through the blood vessels of the circulatory system.

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## Helioseismology

Helioseismology, a term coined by Douglas Gough, is the study of the structure and dynamics of the Sun through its oscillations.

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## Helmholtz resonance

Helmholtz resonance or wind throb is the phenomenon of air resonance in a cavity, such as when one blows across the top of an empty bottle.

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## Hidden oscillation

An oscillation in a dynamical system can be easily localized numerically if initial conditions from its open neighborhood lead to long-run behavior that approaches the oscillation.

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## Infinity

Infinity (symbol) is a concept describing something without any bound or larger than any natural number.

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## Insulin oscillation

The insulin concentration in blood increases after meals and gradually returns to basal levels during the next 1–2 hours.

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## Interval (mathematics)

In mathematics, a (real) interval is a set of real numbers with the property that any number that lies between two numbers in the set is also included in the set.

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## Kinetic energy

In physics, the kinetic energy of an object is the energy that it possesses due to its motion.

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## Laser

A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation.

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## Lever escapement

The lever escapement, invented by British clockmaker Thomas Mudge in 1755, is a type of escapement that is used in almost all mechanical watches, as well as small mechanical non-pendulum clocks, alarm clocks, and kitchen timers.

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## Lift coefficient

The lift coefficient (CL, CN or Cz) is a dimensionless coefficient that relates the lift generated by a lifting body to the fluid density around the body, the fluid velocity and an associated reference area.

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## Linearity

Linearity is the property of a mathematical relationship or function which means that it can be graphically represented as a straight line.

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## Local oscillator

In electronics, a local oscillator (LO) is an electronic oscillator used with a mixer to change the frequency of a signal.

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## Lotka–Volterra equations

The Lotka–Volterra equations, also known as the predator–prey equations, are a pair of first-order nonlinear differential equations, frequently used to describe the dynamics of biological systems in which two species interact, one as a predator and the other as prey.

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## Malthusianism

Malthusianism is the idea that population growth is potentially exponential while the growth of the food supply is linear.

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## Mechanical equilibrium

In classical mechanics, a particle is in mechanical equilibrium if the net force on that particle is zero.

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## Mercury beating heart

The mercury beating heart is an electrochemical redox reaction between the elements mercury, iron and chromium.

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## Momentum

In Newtonian mechanics, linear momentum, translational momentum, or simply momentum (pl. momenta) is the product of the mass and velocity of an object.

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## Multivibrator

A multivibrator is an electronic circuit used to implement a variety of simple two-state devices such as relaxation oscillators, timers and flip-flops.

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## Musical instrument

A musical instrument is an instrument created or adapted to make musical sounds.

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## Neural oscillation

Neural oscillations, or brainwaves, are rhythmic or repetitive patterns of neural activity in the central nervous system.

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## Neuron

A neuron, also known as a neurone (British spelling) and nerve cell, is an electrically excitable cell that receives, processes, and transmits information through electrical and chemical signals.

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## Neutral particle 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.

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## Neutrino oscillation

Neutrino oscillation is a quantum mechanical phenomenon whereby a neutrino created with a specific lepton flavor (electron, muon, or tau) can later be measured to have a different flavor.

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## Neutron-star oscillation

Asteroseismology studies the internal structure of our Sun and other stars using oscillations.

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## Normal mode

A normal mode of an oscillating system is a pattern of motion in which all parts of the system move sinusoidally with the same frequency and with a fixed phase relation.

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## Open set

In topology, an open set is an abstract concept generalizing the idea of an open interval in the real line.

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## Oscillating gene

In molecular biology, an oscillating gene is a gene that is expressed in a rhythmic pattern or in periodic cycles.

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## Oscillator (cellular automaton)

In a cellular automaton, an oscillator is a pattern that returns to its original state, in the same orientation and position, after a finite number of generations.

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## Oscillator phase noise

0,..., t6) one can see that the deviation in amplitude dissipates while the deviation in phase does not.| --> Oscillators inherently produce high levels of phase noise. That noise increases at frequencies close to the oscillation frequency or its harmonics. With the noise being close to the oscillation frequency, it cannot be removed by filtering without also removing the oscillation signal. And since it is predominantly in the phase, it can be removed without any limiter. All well-designed nonlinear oscillators have stable limit cycles, meaning that if perturbed, the oscillator will naturally return to its limit cycle. This is depicted in the figure on the right (removed due to unknown copyright status). Here the stable limit cycle is shown in state space as a closed orbit (the ellipse). When perturbed, the oscillator responds by spiraling back into the limit cycle. However, by observing the time stamps, it is easy to see that while the oscillation returns to its stable limit cycle, it does not return at the same phase. This is because the oscillator is autonomous; it has no stable time reference. The phase is free to drift. As a result, any perturbation of the oscillator causes the phase to drift, which explains why the noise produced by an oscillator is predominantly in phase.

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## Oscillistor

An oscillistor is a semiconductor device, consisting of a semiconductor specimen placed in magnetic field, and a resistor after a power supply.

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## Pacific decadal oscillation

The Pacific Decadal Oscillation (PDO) is a robust, recurring pattern of ocean-atmosphere climate variability centered over the mid-latitude Pacific basin.

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## Pendulum

A pendulum is a weight suspended from a pivot so that it can swing freely.

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## Periodic function

In mathematics, a periodic function is a function that repeats its values in regular intervals or periods.

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## Phase noise

In signal processing, phase noise is the frequency domain representation of rapid, short-term, random fluctuations in the phase of a waveform, caused by time domain instabilities ("jitter").

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## Phase-shift oscillator

A phase-shift oscillator is a linear electronic oscillator circuit that produces a sine wave output.

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## Pierce oscillator

The Pierce oscillator is a type of electronic oscillator particularly well-suited for use in piezoelectric crystal oscillator circuits.

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## Pilot-induced oscillation

Pilot-induced oscillations, as defined by MIL-HDBK-1797A, are sustained or uncontrollable oscillations resulting from efforts of the pilot to control the aircraft and occurs when the pilot of an aircraft inadvertently commands an often increasing series of corrections in opposite directions, each an attempt to cover the aircraft's reaction to the previous input with an overcorrection in the opposite direction.

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## Place of articulation

In articulatory phonetics, the place of articulation (also point of articulation) of a consonant is the point of contact where an obstruction occurs in the vocal tract between an articulatory gesture, an active articulator (typically some part of the tongue), and a passive location (typically some part of the roof of the mouth).

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## Potential energy

In physics, potential energy is the energy possessed by an object because of its position relative to other objects, stresses within itself, its electric charge, or other factors.

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## Predation

Predation is a biological interaction where a predator (a hunting animal) kills and eats its prey (the organism that is attacked).

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## Quantum harmonic oscillator

The quantum harmonic oscillator is the quantum-mechanical analog of the classical harmonic oscillator.

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## Quantum optics

Quantum optics (QO) is a field of research that uses semi-classical and quantum-mechanical physics to investigate phenomena involving light and its interactions with matter at submicroscopic levels.

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## Quasi-biennial oscillation

The quasi-biennial oscillation (QBO) is a quasiperiodic oscillation of the equatorial zonal wind between easterlies and westerlies in the tropical stratosphere with a mean period of 28 to 29 months.

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## Real number

In mathematics, a real number is a value of a continuous quantity that can represent a distance along a line.

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## Reciprocating motion

Reciprocating motion, also called reciprocation, is a repetitive up-and-down or back-and-forth linear motion.

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## Relaxation oscillator

In electronics a relaxation oscillator is a nonlinear electronic oscillator circuit that produces a nonsinusoidal repetitive output signal, such as a triangle wave or square wave.

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## Resonator

A resonator is a device or system that exhibits resonance or resonant behavior, that is, it naturally oscillates at some frequencies, called its resonant frequencies, with greater amplitude than at others.

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## Reversible process (thermodynamics)

In thermodynamics, a reversible process is a process whose direction can be "reversed" by inducing infinitesimal changes to some property of the system via its surroundings, with no increase in entropy.

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## Rhythm

Rhythm (from Greek ῥυθμός, rhythmos, "any regular recurring motion, symmetry") generally means a "movement marked by the regulated succession of strong and weak elements, or of opposite or different conditions".

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## RLC circuit

An RLC circuit is an electrical circuit consisting of a resistor (R), an inductor (L), and a capacitor (C), connected in series or in parallel.

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## Royer oscillator

A Royer oscillator is an electronic relaxation oscillator that employs a saturable-core transformer.

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## Seasonality

In time series data, seasonality is the presence of variations that occur at specific regular intervals less than a year, such as weekly, monthly, or quarterly.

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## Self-oscillation

Self-oscillation is the generation and maintenance of a periodic motion by a source of power that lacks any corresponding periodicity.

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## Self-pulsation

Self-pulsation is a transient phenomenon in continuous-wave lasers.

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## Sequence

In mathematics, a sequence is an enumerated collection of objects in which repetitions are allowed.

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## Signal generator

A signal generator is an electronic device that generates repeating or non-repeating electronic signals in either the analog or the digital domain.

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## Simple harmonic motion

In mechanics and physics, simple harmonic motion is a special type of periodic motion or oscillation motion where the restoring force is directly proportional to the displacement and acts in the direction opposite to that of displacement.

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## Spring (device)

A spring is an elastic object that stores mechanical energy.

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## Squegging

Squegging is a radio engineering term.

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## Statics

Statics is the branch of mechanics that is concerned with the analysis of loads (force and torque, or "moment") acting on physical systems that do not experience an acceleration (a.

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## Stiffness

Stiffness is the rigidity of an object — the extent to which it resists deformation in response to an applied force.

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## String instrument

String instruments, stringed instruments, or chordophones are musical instruments that produce sound from vibrating strings when the performer plays or sounds the strings in some manner.

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## String vibration

A vibration in a string is a wave.

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## Structural stability

In mathematics, structural stability is a fundamental property of a dynamical system which means that the qualitative behavior of the trajectories is unaffected by small perturbations (to be exact ''C''1-small perturbations).

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## Swing (seat)

A swing is a hanging seat, often found at playgrounds for children, at a circus for acrobats, or on a porch for relaxing, although they may also be items of indoor furniture, such as Latin American hammock or the Indian oonjal.

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## Tension (physics)

In physics, tension may be described as the pulling force transmitted axially by the means of a string, cable, chain, or similar one-dimensional continuous object, or by each end of a rod, truss member, or similar three-dimensional object; tension might also be described as the action-reaction pair of forces acting at each end of said elements.

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## Time

Time is the indefinite continued progress of existence and events that occur in apparently irreversible succession from the past through the present to the future.

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## Toda oscillator

In physics, the Toda oscillator is a special kind of nonlinear oscillator.

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## Torsional vibration

Torsional vibration is angular vibration of an object—commonly a shaft along its axis of rotation.

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## Tuned mass damper

A tuned mass damper, also known as a harmonic absorber or seismic damper, is a device mounted in structures to reduce the amplitude of mechanical vibrations.

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## Tuning fork

A tuning fork is an acoustic resonator in the form of a two-pronged fork with the prongs (tines) formed from a U-shaped bar of elastic metal (usually steel).

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## Vackář oscillator

A Vackář oscillator is a wide range variable frequency oscillator (VFO) that strives for a near constant output amplitude over its frequency range.

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## Vibration

Vibration is a mechanical phenomenon whereby oscillations occur about an equilibrium point.

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## Vibrator (mechanical)

A vibrator is a mechanical device to generate vibrations.

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## Water

Water is a transparent, tasteless, odorless, and nearly colorless chemical substance that is the main constituent of Earth's streams, lakes, and oceans, and the fluids of most living organisms.

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## Wavelength

In physics, the wavelength is the spatial period of a periodic wave—the distance over which the wave's shape repeats.

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## Weight

In science and engineering, the weight of an object is related to the amount of force acting on the object, either due to gravity or to a reaction force that holds it in place.

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## Wien bridge oscillator

A Wien bridge oscillator is a type of electronic oscillator that generates sine waves.

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## Wilberforce pendulum

A Wilberforce pendulum, invented by British physicist Lionel Robert Wilberforce around 1896, consists of a mass suspended by a long helical spring and free to turn on its vertical axis, twisting the spring.

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## Wing

A wing is a type of fin that produces lift, while moving through air or some other fluid.

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## 24-hour news cycle

The 24-hour news cycle (or 24/7 news cycle) is 24-hour investigation and reporting of news, concomitant with fast-paced lifestyles.

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## Redirects here:

Coupled oscillation, Coupled oscillator, Coupled oscillators, Electric oscillator, Electric oscillators, Electrical oscillators, Forced oscillation, Forced oscillations, Forced vibrations, Oscillate, Oscillates, Oscillating, Oscillating circuit, Oscillating circuits, Oscillating motion, Oscillating system, Oscillations, Oscillator, Oscillators, Oscillatory, Oscillatory motion, Oscillatory period, Period of oscillation, Vibrating.

## References

[1] https://en.wikipedia.org/wiki/Oscillation