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TECHNICAL PAPERS

Modes and Balance of Energy in the Piezoelectric Cochlear Outer Hair Cell Wall

[+] Author and Article Information
Alexander A. Spector, Ronald P. Jean

Department of Biomedical Engineering, Johns Hopkins University, 720 Rutland Ave., Baltimore, MD 21205

J Biomech Eng 126(1), 17-25 (Mar 09, 2004) (9 pages) doi:10.1115/1.1644564 History: Received December 10, 2002; Revised October 10, 2003; Online March 09, 2004
Copyright © 2004 by ASME
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References

Figures

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a) Cross-section of the cochlea showing inner (IHC) and outer hair cells (OHC) sitting between the tectorial and basilar membranes; b) sketch of an outer hair cell under the action of an electric field and axial force; and c) a model of the outer hair cell as a cylinder with a liquid (incompressible) core bounded by a lateral wall (Sl and Sl+ are, respectively, the internal and external surfaces of the lateral wall) and two flat caps Sa and Sb
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The longitudinal (a) and circumferential (b) components of the passive strain as functions of voltage for different values of the external force (closed triangles F=0.3 mN/m, open circles F=−0.3 mN/m, and solid line F=0)
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The first form of the active energy (entering balance of the mechanical energy) as a function of voltage for different values of the external force (closed triangles F=0.3 mN/m, open circles F=−0.3 mN/m, and solid line F=0); a) C22=0.2 N/m, and b) C22=0.3 N/m
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The stored mechanical energy as a function of voltage for different values of the external force (closed triangles F=0.3 mN/m, open circles F=−0.3 mN/m, and solid line F=0); a) C22=0.2 N/m, and b) C22=0.3 N/m
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The second form of the active energy (entering balance of the electrical energy) as a function of voltage for different values of the external force (closed triangles F=0.3 mN/m, open circles F=−0.3 mN/m, and solid line F=0); a) C22=0.2 N/m, and b) C22=0.3 N/m
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The external electrical work as a function of voltage for different values of the external force (closed triangles F=0.3 mN/m, open circles F=−0.3 mN/m, and solid line F=0)
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The effectiveness of the electromotile outer hair cell as a function of voltage under the conditions of purely electrical loading for two values of C22

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