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instability |
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instability 1. tendency to variable or unpredictable behaviour 2. Physics a fast growing disturbance or wave in a plasma instability [‚in·stə′bil·əd·ē] (control systems) A condition of a control system in which excessive positive feedback causes persistent, unwanted oscillations in the output of the system. (physics) A property of the steady state of a system such that certain disturbances or perturbations introduced into the steady state will increase in magnitude, the maximum perturbation amplitude always remaining larger than the initial amplitude. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Rainier Boot, the latest addition to the company's line of Sure Step custom ankle-foot orthoses, is used in the management of moderate to severe posterior tibialis tendon dysfunction, degenerative arthritis, severe pronation, and other ankle instabilities. The Shadow Moire system can be used to characterize the surface topography of paper and to study the problems of dimensional instabilities. Mayer argues that his group has shown that a protoplanetary disk can evolve through a sequence of milder instabilities, coming to a point where the disk fragments into planet forming clumps. |
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