perturbation

orbit perturbation of spacecraft

Frank's atheism was more than a perturbation to Michael.

some minor perturbation in his house's cash flow.

Perturbation Theory IV. Recurrences. Dephasing. Quasi-Degeneracy. Polyads.

This perturbation of the electronic structure has been known as "pressure-tuning", which can reveal the piezochromism and changes in electronic spectra due to structural distortions.

The large deflection problem of cantilever beams was studied by means of the biparametric perturbation method and the first order derivative substitution from pseudolinear analysis approach.