small perturbation

small perturbation

[′smȯl ‚pərd·ər′bā·shən]
(physics)
A disturbance imposed on a system in steady state, with amplitude assumed small of the first order; that is, the square of the amplitude is negligible in comparison with the amplitude, and the derivatives of the perturbation are assumed to be of the same order of magnitude as the perturbation.
References in periodicals archive ?
Light is not a small perturbation anymore; it couples strongly with the material.
Over the past decade, in part frustrated by perceived slow uptick of public concern, scientists added the following idea: you know, climate change is not just a slow small perturbation in average conditions.
In the hypothesis that the solar corona is in a state of self-organized criticality, the stressing of the magnetic field should be enhanced until a small perturbation switches on many small instabilities, happening together as it occurs in avalanches.
They present a unified analysis of the general linear and nonlinear systems of algebraic equations that depend on a small perturbation parameter.
P&O, IncCond) suffer an irreparable weakness: large perturbation step increases the oscillation magnitude at steady state while small perturbation step reduces the convergence speed.
n] is also a small perturbation, to first order, in [V.
where the positive and negative energy levels in (4) now overlap, and where any small perturbation to the PV can result in an electron-positron pair being created (the electron traveling in free space and the positron in the PV).
Here we focus on the strategy to control transport properties without significantly altering neither the original structure of the system under investigation nor its overall chaotic structure which is based on building barriers by adding a small perturbation which is localized in phase space, hence confining all the trajectories.
Topics include the small perturbation surface backscattering model, the simplified integral equation surface backscattering model, the IEM-B surface backscattering model and its bistatic properties, backscatter from multiscale surfaces, the standard moment method, a model for scattering from a low-dielectric layer of Rayleigh scatterers with irregular layer boundaries, and emission models for rough surfaces and a Rayleigh layer with irregular layer boundaries.
i+1]) a small perturbation of the initial conditions [{[delta]}.
Any small perturbation caused by viscosity or temperature gradient can trigger the asymmetry of gas (water) tips in the parts and result in fingerings.
Under the small perturbation of [phi], some changes have taken place about the dual of Wegl-Heisenberg frames.

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