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1
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Fractional-order models: The case study of the supercapacitor capacitance measurement

100%
Lewandowski M., Orzyłowski M.
|
2017
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issue 4
2
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Cost comparison of different configurations of a hybrid energy storage system with battery-only and supercapacitor-only storage in an electric city bus

81%
Wieczorek M., Lewandowski M., Jefimowski W.
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2019
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issue 6
3
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Oxidation Kinetics of Thin and Ultrathin Fe Films

81%
Marczyńska A., Skoryna J., Lewandowski M., Smardz L.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
549-551
EN
We have studied oxidation kinetics of Fe thin films under atmospheric conditions using the fact that metallic iron is a ferromagnet but ultrathin natural iron oxides are practically nonmagnetic at room temperature. As a consequence, oxidation is associated with a loss in ferromagnetism. Fe thin films were deposited onto 1.5 nm V thick buffer layer using UHV magnetron sputtering. As a substrate we have used Si(100) wafers with an oxidised surface. Results show that all samples with an initial Fe thickness greater than 6 nm oxidize practically instantaneously, whereby a constant amount of 2.5 nm of metal is transformed into oxides. For iron thickness lower than 6 nm the time constant for oxidation increases considerably reaching a value of 30 days for the initial Fe thickness equal to 4 nm.
4
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Influence of contact gaps on the conditions of vehicles supply and wear and tear of catenary wires in a 3 kV DC traction system

72%
Maciołek T., Lewandowski M., Szeląg A., Steczek M., Maciołek T., Lewandowski M., Szeląg A., Steczek M.
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2020
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issue 4
5
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The Application of Ultrasonic Methods to Flow Measurement and Detection of Microembolus in Heart Prostheses

61%
Gawlikowski M., Lewandowski M., Nowicki A., Kustosz R., Walczak M., Karwat P., Karłowicz P.
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EN
For the last 20 years the world cardiosurgery has presented a considerable change of attitude to mechanical circulatory support. In spite of technological progress the main problems in ventricular assist devices are: thrombosis and low accuracy of flow measurements. In this paper the prototype of multi-gate Doppler flowmeter intended for cardiac assist system ReligaHeart EXT has been presented as well as the possibility of ultrasonic microembolus detection.
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