Source:http://linkedlifedata.com/resource/pubmed/id/12656406
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| Predicate | Object |
|---|---|
| rdf:type | |
| lifeskim:mentions | |
| pubmed:issue |
3
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| pubmed:dateCreated |
2003-3-26
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| pubmed:abstractText |
In the present paper we deal with calculating and measuring the third-order nonlinearity parameter C/A for organic liquids and biological fluids. For the organic liquids, the second-order derivative of sound speed with respect to pressure at constant entropy is discussed in terms of thermodynamic parameters, and a formula for calculating C/A is established. Calculated results of C/A for various organic liquids demonstrate that omitting the second-order derivative of sound speed with respect to sound pressure in an isentropic process, could overestimate the value of C/A about 20%-30%. For measuring C/A, the finite-amplitude insert substitution technique is employed. A theoretical description of the sound pressure amplitude for the third-order harmonics is obtained using the perturbation method, in which the sound pressure amplitude of the third-order harmonics is shown approximately as a parabolic function of the propagation distance in the medium. By measuring and comparing the sound pressure amplitudes of the third-order harmonics when inserting a test sample, the reference liquid, and a comparative liquid, respectively, the value of C/A for the sample liquid is determined with reference to known C/A values of reference and comparative liquids. An experimental setup is developed, and the measured values of C/A for the organic liquids agree with the predicted ones calculated by the thermodynamic methods. Furthermore, the finite-amplitude method is extended to measure the C/A parameter for biological fluids, and the measured values of C/A for several biological fluids are also presented.
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| pubmed:language |
eng
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| pubmed:journal | |
| pubmed:citationSubset |
IM
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| pubmed:chemical | |
| pubmed:status |
MEDLINE
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| pubmed:month |
Mar
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| pubmed:issn |
0001-4966
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| pubmed:author | |
| pubmed:issnType |
Print
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| pubmed:volume |
113
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| pubmed:owner |
NLM
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| pubmed:authorsComplete |
Y
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| pubmed:pagination |
1743-8
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| pubmed:dateRevised |
2006-12-27
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| pubmed:meshHeading |
pubmed-meshheading:12656406-Body Fluids,
pubmed-meshheading:12656406-Finite Element Analysis,
pubmed-meshheading:12656406-Humans,
pubmed-meshheading:12656406-Models, Theoretical,
pubmed-meshheading:12656406-Nonlinear Dynamics,
pubmed-meshheading:12656406-Solvents,
pubmed-meshheading:12656406-Thermodynamics,
pubmed-meshheading:12656406-Ultrasonography
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| pubmed:year |
2003
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| pubmed:articleTitle |
Theoretical calculation and experimental study on the third-order nonlinearity parameter C/A for organic liquids and biological fluids.
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| pubmed:affiliation |
State Key Lab of Modern Acoustics, Institute of Acoustics, Nanjing University, Nanjing 210093, People's Republic of China.
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| pubmed:publicationType |
Journal Article
|