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Absorption and Dispersion of Ultrasonic Waves in n-Amylic Alcohol-Nitromethane Critical Mixture

100%
Hornowski T., Łabowski M.
Acta Physica Polonica A
|
1991
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vol. 79
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issue 5
671-682
EN
Measurement of absorption and propagation velocity of ultrasonic waves as well as shear viscosity in n-amylic alcohol-nitromethane critical mixture are reported. Acoustic measurements were performed in the frequency range from 5 to 25 MHz and temperatures ΔT = T - T_{c} from 0.1 to 12.3 K. An analysis of the results was carried out on the basis of a modified version of mode-coupling theory [10], which led to good agreement with experiment. The correlation length ξ_{0} = 0.94 Ǻ is in agreement with the value obtained from optical measurements.
2
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Ultrasonic Waves in Magnetic Liquids: Two-Phase Approach and Experimental Results

81%
Kaczmarek M., Hornowski T., Skumiel A., Łabowski M.
Acta Physica Polonica A
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2000
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vol. 97
|
issue 4
639-649
EN
A two-phase model of dynamical behavior of magnetic liquid influenced by constant magnetic field is considered. The model takes into account mutual interaction of clusters giving skeleton's stiffness and interaction of clusters with free liquid producing attenuation and dispersion of waves for transversally isotropic system. Rotational degrees of freedom are disregarded. Predictions of the model are discussed for variable amount of clusters and compared with experimental data for different magnetic fields.
3
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Ultrasonic Wave Propagation Velocity in Nonconducting Liquids in an External DC Electric Field

81%
Łabowski M., Skumiel A., Hornowski T.
Acta Physica Polonica A
|
1991
|
vol. 79
|
issue 5
683-693
EN
A theoretical analysis of variations in the propagation velocity of ultrasonic waves in liquid dielectrics in an external DC electric field was performed. Measurements of these variations in transformer oil in dependence on the field strength and temperature were made applying the phase method. To express the experimental results in graphical form numerical procedure of interpolation in Lagrange polynomials was used. The experimentally obtained variations in the velocity are compared with those predicted theoretically by the formulae derived.
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