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Acoustic Wave Propagation in Mercury in Constant External Magnetic Field

100%

Skumiel A.

Acta Physica Polonica A

1993

vol. 83

issue 2

173-185

The paper gives a theoretical analysis of the effect of an external constant magnetic field on the propagation of ultrasonic waves in electrically conducting liquids as well as the results of measurements carried out in mercury. The theoretical part is based on Euler's equation, the equation of continuity, the thermodynamical equation, and Maxwell,s equations. In the experimental part we propose and apply two methods for the measurement of the ultrasonic propagation velocity and its variations, as well as a pulse method perfected by the use of analog memory for the determination of the amplitude absorption coefficient. The correctness of the theoretical basis underlying the calculation of the small changes in propagation velocity induced by the magnetic field is confirmed by experiment. The amplitude absorption coefficient determined experimentally is considerably greater than that calculated theoretically for the medium studied.

Structural and Thermophysical Properties of Magnetic Beads Containing Metallic Nanocrystallites

51%

Izydorzak M., Leonowicz M., Skumiel A.

Acta Physica Polonica A

2012

vol. 121

issue 1

68-70

Cobalt, iron, nickel and iron carbide nanocrystallites, stabilized within carbon beads, were prepared by the three-step procedure including formation of metal acrylamide complex, followed by frontal polymerization and pyrolysis of the polymer at various temperatures. The beads containing the nanocrystallites exhibit domination of the ferromagnetic ordering. The analysis of calorimetric results allowed estimation of the efficiency of the hyperthermal effect, under the influence of an alternating magnetic field. The XTT tests show that the extracts prepared on the basis of the Fe_3C containing beads are nontoxic, whereas these made of the composites containing Co and Ni exhibit negligible cytotoxicity for the test article/vehicle ratios 6.25 and 3.125 mg/ml.

Ultrasonic Waves in Magnetic Liquids: Two-Phase Approach and Experimental Results

51%

Kaczmarek M., Hornowski T., Skumiel A., Łabowski M.

Acta Physica Polonica A

2000

vol. 97

issue 4

639-649

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.

Ultrasonic Wave Propagation Velocity in Nonconducting Liquids in an External DC Electric Field

51%

Łabowski M., Skumiel A., Hornowski T.

Acta Physica Polonica A

1991

vol. 79

issue 5

683-693

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.

Properties of Magnetosome Suspension under the Influence of Magnetic Field

33%

Józefczak A., Molčan M., Rozynek Z., Hornowski T., Skumiel A., Timko M., Tóthová J., Kopčanský P., Leszczyński B.

Acta Physica Polonica A

2015

vol. 127

issue 2

629-631

The magnetotactic bacteria synthesize chains of nanosized magnetic particles that function as a compass needle to navigate in the direction of the earth's magnetic field. Magnetosomes are bacterial magnetic nanoparticles containing iron mineral crystals of magnetite or greigite, enveloped by a natural biological membrane. The objective of the work is to study the influence of magnetic field on rheology and acoustic properties of magnetosome suspension. Experimental results show a clear effect of the external magnetic field on the acoustic parameters such as velocity and attenuation of ultrasonic wave, and the viscosity of the suspension, arising from the biogenic magnetic particles aggregation.

46th Winter School on Wave and Quantum Acoustics XLVth Jubilee Winter School on Environmental Acoustics and Vibroacoustics Szczyrk, Poland, February 27 – March 2, 2017

15%

Borucki S., Łuczak J., Zmarzły D., Kunicki M., Cichoń A., Witos F., Leśnik C., Klimaszewski K., Gudra T., Serafin P., Rogala T., Timko M., Pleban D., Filipiak J., Banasiak D., Herman K., Opieliński K., Hejczyk T., Jasek K., Pasternak M., Grabka M., Kardyś W., Milewski A., Kawalec A., Okoń-Fąfara M., Fąfara B., Olszewska A., Pruchnicki P., Wrzosek M., Nicpoń J., Podgórski P., Pustelny T., Szugajew M., Stec O., Szerszeń G., Wotzka D., Boruń A., Bald A., Dzida M., Jężak S., Geppert-Rybczyńska M., Kaczmarek K., Hornowski T., Józefczak A., Kubovčíková M., Skumiel A., Rozynek Z., Timko M., Kopcansky P., Linde B., Verveyko V. N., Verveyko M. V., Verveyko D. V., Verisokin A. Y., Chebrov N. S., Mikulski W., Augustyńska D., Smagowska B.

Archives of Acoustics

2017

vol. 42

issue 1

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Acoustic Wave Propagation in Mercury in Constant External Magnetic Field

Structural and Thermophysical Properties of Magnetic Beads Containing Metallic Nanocrystallites

Ultrasonic Waves in Magnetic Liquids: Two-Phase Approach and Experimental Results

Ultrasonic Wave Propagation Velocity in Nonconducting Liquids in an External DC Electric Field

Properties of Magnetosome Suspension under the Influence of Magnetic Field

46th Winter School on Wave and Quantum Acoustics XLVth Jubilee Winter School on Environmental Acoustics and Vibroacoustics Szczyrk, Poland, February 27 – March 2, 2017