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 ?
The overall shape of a protein determines its function, so some small perturbation in that shape can produce a misfolded protein and lead to serious medical conditions, Ramanathan said.
Tan, "Scattering of electromagnetic waves from 3D multilayer random rough surfaces based on the second-order small perturbation method: energy conservation, reflectivity, and emissivity," Journal of the Optical Society of America A, vol.
As a small perturbation with energy E is added along the constant [mu] trajectory in the Kruskal coordinate to one of the boundary at early time [t.sub.w], one finds that a bound of infinite energy accumulates near the horizon and a shock wave geometry forms at t = 0, which is the so-called butterfly effect in the AdS blackholes [20].
A Small Perturbation of One-Dimensional Steady State Water.
[5,12] indicated that by embedding a small perturbation in a DAE system, a corresponding ODE system can be obtained.
For a trading strategy [phi], a small perturbation [DELTA], and a partition [tau] of [0, T], the risk quotient [r.sup.[tau]][[phi], [DELTA]] is defined as
Moghaddam, "Study of validity region of small perturbation method for two-layer rough surfaces," IEEE Geoscience and Remote Sensing Letters, vol.
Simulation is made to investigate evolution of small perturbation, lateral stability of vehicle, and vehicle's fuel consumption, respectively.
In the perturbation method, a properly chosen small perturbation parameter should be provided during the solution.
Classical analytic methods include the small perturbation method (SPM) and the Kirchhoff approximation (KA), which have been extensively studied in [1, 2].
Light is not a small perturbation anymore; it couples strongly with the material.

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