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Any effect that varies in a back-and-forth or reciprocating manner. Examples of oscillation include the variations of pressure in a sound wave and the fluctuations in a mathematical function whose value repeatedly alternates above and below some mean value.

The term oscillation is for most purposes synonymous with vibration, although the latter sometimes implies primarily a mechanical motion. The alternating current and the associated electric and magnetic fields are referred to as electric (or electromagnetic) oscillations.

If a system is set into oscillation by some initial disturbance and then left alone, the effect is called a free oscillation. A forced oscillation is one in which the oscillation is in response to a steadily applied periodic disturbance.

Any oscillation that continually decreases in amplitude, usually because the oscillating system is sending out energy, is spoken of as a damped oscillation. An oscillation that maintains a steady amplitude, usually because of an outside source of energy, is undamped. See Anharmonic oscillator, Damping, Forced oscillation, Harmonic oscillator, Vibration

McGraw-Hill Concise Encyclopedia of Physics. © 2002 by The McGraw-Hill Companies, Inc.


(control systems)
The oscillation of a real-valued function on an interval is the difference between its least upper bound and greatest lower bound there.
The oscillation of a real-valued function at a point x is the limit of the oscillation of the function on the interval [x-e, x + e ] as e approaches 0. Also known as saltus.
Any effect that varies periodically back and forth between two values.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
In patients who have received HFO, CPAP was required in six patients; however, none of these patients required reintubation (p = 0.187 and p < 0.001).
Momentum toward an HFO phaseout in the Arctic is building.
At this month's Marine Environment Protection Committee meeting, IMO member states must build on the progress already made by supporting the HFO phase-out proposed by Canada.
TC, TG, VLDL and LDL-c level in HFO treated rats was decreased by 11%, 23%, 24% and 12% respectively whereas HDL-c increased by 12%.
Figure 6 shows the staining of 4-HNE protein adducts was found to be significantly elevated in livers of LFOE (Figure 6(b)) and HFO (Figure 6(d)) and HFOE (Figure 6(e)) as compared to LFO (Figure 6(a)) group (p < 0.0001).
The installation of 6000 MW net imported coal-fired power generation complex will replace approximately 6.8 million tons of HFO causing a loss of around US $5 billion per year to the oil companies at prevailing rates.
Installation is very simple as the unit is supplied as a small skid so only a gas oil line and a HFO line need to be connected at one end, and a discharge line at the other end.
One possibility considered is for the manufacturer concerned - the Commission did not mention a name but was clearly referring to the German firm Daimler, which is unwilling to use HFO 1234yf - to take off the market all the models considered not in compliance.
The HFO and diesel fuel oil will be stored in dedicated above-ground tanks at the same location as the power plant.
GE is featuring its Heavy Fuel Oil (HFO) combined cycle plant and FlexEfficiency 60 Portfolio that promotes energy efficiency, complementing Saudi Arabia's sustainable energy management initiatives at the show.
The company's European Refrigeration Training Academy, based near Birmingham, has been equipped with a state-of-the-art working HFO water chiller linked to an integral HC refrigerated cabinet alongside its existing C[O.sup.2] systems, enabling engineers to be trained in the new generation of low global warming refrigerants and hydrocarbons.
Edstroms has built a successful HFO in Jonkoping, Sweden and we aim to do the same here, in Losning, Denmark."