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Etymology: L, per + tubare, to disturb
a cause or a condition of disturbance, disorder, or confusion.


In physical therapy, an external force applied to a person's center of mass in an attempt to move it from the base of support


(pĕr″tĕr-bā′shŭn) [L. perturbare, thoroughly disordered]
1. The state of being greatly disturbed or agitated; uneasiness of mind.
2. A disturbance or a change in a structure or function, usually as a result of an external influence.


n a small disturbance that tips a metastable system over into disorder and chaos.
References in periodicals archive ?
3) as functions of the perturbations in the data A, S, Q, R, T.
This event is analyzed by studying the velocity perturbations analysis of 2,141 fragments cataloged through 201 days following the event.
When compared with the clinical analog of constant maximal excitation of target muscle groups, both feedback control systems significantly reduced (>40%) the UL loading required to resist postural perturbations.
034) using surface translation but not cable pulls, foot collisions during lateral perturbations (p= 0.
A new analysis of how perturbations propagate through a network of organisms reveals that when an ecosystem is already off-killer, proactively removing particular species can halt the cascade of destruction that may follow.
Further studies will be carried out considering different types of perturbations, more numerical values to cover a wider area and taking into account the nonlinearities of the system.
Mathematical models would eventually be used to estimate exposure levels that would not cause biologically significant perturbations in these pathways.
2004a, 2004b, 2004c) and Khan & Shahzad (2008) in which a very small and suitably chosen perturbations can indeed be an efficient control for Hamiltonian systems which are perturbations of integrable ones.
Here he devotes himself to the bounds for the zeros of entire functions and variations of zeros under perturbations.
The device manifested the possibility to register very weak gravitational perturbations of non-seismic kind both from celestial bodies and from the internal processed in the terrestrial globe.
localized pressure perturbations of the surface, which will generate a flow in the film and coupled with it a deformation of the free surface, resulting in thickness variations.
The only place outside heaven you can be perfectly safe from all dangers and perturbations of love is hell.

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