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Method to Measure Tone of Axial and Proximal Muscle

Method to Measure Tone of Axial and Proximal Muscle

Published on: December 14, 2011

Nonlinear torsional oscillations in rotating systems.

X Liao¹, K Zhang, Y Chang

¹Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China.

Physical Review Letters

|March 16, 2007

Summary

Nonlinear torsional oscillations, variations in stellar and planetary rotation, can be generated by convective instabilities. This study demonstrates their maintenance through these natural fluid dynamics processes in rotating systems.

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Area of Science:

Astrophysics
Geophysics
Fluid Dynamics

Background:

Torsional oscillations, temporal variations in differential rotation, are known in convective stars and planets.
These oscillations are typically observed in fluid regions of celestial bodies.

Purpose of the Study:

To demonstrate for the first time that nonlinear torsional oscillations can be generated and sustained by convective instabilities.
To explore the role of convective instabilities in maintaining differential rotation variations.

Main Methods:

Numerical simulations of rotating fluid systems with convective instabilities.
Analysis of temporal variations in differential rotation patterns.

Main Results:

Nonlinear torsional oscillations were successfully generated within the simulated rotating systems.
Convective instabilities were shown to be the driving mechanism for these oscillations.
The oscillations were maintained over time by the ongoing convective processes.

Conclusions:

Convective instabilities are capable of generating and sustaining nonlinear torsional oscillations.
This finding provides a new mechanism for understanding rotational dynamics in stars and planets.
The results have implications for models of stellar and planetary interiors.