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Your search keyword '"Danielewski, Marek"' showing total 312 results
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312 results on '"Danielewski, Marek"'

9. Competition between Chemical and Gravity Forces in Binary Alloys

Author

Wierzba Bartek, Mashimo Tsutomu, and Danielewski Marek

Subjects
cu-sn system, growth kinetics, sedimentation, Technology, Chemical technology, TP1-1185, Chemicals: Manufacture, use, etc., TP200-248
Abstract

We present the first experimental results of the growth of Cu6Sn5 and Cu3Sn under an external force field – during the sedimentation process. The results are compared with the proposed model under the combined influence of the Kirkendall effect, backstress and sedimentation. It is shown that Cu3Sn consumes the preformed Cu6Sn5 phase during sedimentation under a strong gravitational field of 779,000 G at 200 °C.

Published
2018
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15. Formation and Ripening of Nanobelts/Nanofibers under Stirring of aqueous Solution – alternative models

Author

Korol, Yaroslav, Gusak, Andriy, Danielewski, Marek, Gajewska, Marta, Korol, Yaroslav, Gusak, Andriy, Danielewski, Marek, and Gajewska, Marta

Abstract

Problem of V2 O5 nanobelts production under intensive stirring of V2 O5 powder in salted water is revisited. Method was initially proposed in 2016 but models and understanding were lacking. Here an independent attempt of the controlled V2 O5 nanobelts formation and growth under stirring with various rotation frequencies is reported, as well as some alternative mechanisms and respective mathematical models of the nanobelts growth and ripening kinetics.

Published
2022

21. Diffusion in Cauchy Elastic Solid

Author

Danielewski, Marek and Sapa, Lucjan

Subjects
diffusion equation, Cauchy elastic solid, Schrödinger equation, quaternions, Planck-Kleinert crystal, ddc:530
Abstract

It is commonly accepted that a starting point of the science of diffusion is the phenomenological diffusion equation postulated by German physiologist Adolf Fick inspired by experiments on diffusion by Thomas Graham and Robert Brown. Fick’s diffusion equation has been interpreted decades later by Albert Einstein and Marian Smoluchowski. Here we will show that the theory of diffusion has its elegant mathematical foundations formulated three decades before Fick by French mathematician Augustin Cauchy (~1822). The diffusion equation is straightforward consequence of his model of the elastic solid - the classical balance equations for isotropic, elastic crystal. Basing on the Cauchy model and using the quaternion algebra we present a rigorous derivation of the quaternion form of the diffusion equation. The fundamental consequences of all derived equations and relations for physics, chemistry and the future prospects are presented.

Published
2021

24. Time-dependent phenomena in the potential response of ion-selective electrodes treated by the Nernst-Planck-Poisson model. Part 2: transmembrane processes and detection limit

Author

Sokalski, Tomasz, Kucza, Witold, Danielewski, Marek, and Lewenstam, Andrzej

Subjects
Electrodes, Ion selective -- Models, Electrodes, Ion selective -- Properties, Chemistry
Abstract

The detection limit of ion-selective electrodes (ISEs) is of great interest because of the many possible practical applications of ISEs in trace analysis. Existing theoretical interpretations of the detection limit of ISEs are restricted by severe assumptions such as steady-state and electro-neutrality, which hamper theorizing on this problem. For this reason, the Nernst--Planck--Poisson (NPP) equations are used to predict and visualize the detection limit variability under nonequilibrium conditions. For the first time, the NPP model is applied to the so-called inverse problem: finding the optimal measurement time and inner solution concentration for lowering the detection limit.

Published
2009

42. Diffusion in Materials - DIMAT2004

Author

Danielewski, Marek, primary, Filipek, Robert, additional, Abdank-Kozubski, Rafal, additional, Kucza, Witold, additional, Zięba, Paweł, additional, and Żurek, Zbigniew, additional

Published
2005
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