Juliusz Dąbrowa
AGH University of Science and Technology
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Publication
Featured researches published by Juliusz Dąbrowa.
Defect and Diffusion Forum | 2015
Juliusz Dąbrowa; Witold Kucza; Katarzyna Tkacz-Śmiech; Bogusław Bożek; Marek Danielewski
The Nernst-Planck flux formula is used in Darkens method to obtain the interdiffusion fluxes. The effective interdiffusion potentials, derived for the independent components in the system, allow obtaining the symmetrical matrix of the interdiffusion coefficients. The transport coefficients for 2, 3 and r-component system are presented. Interpretation of obtained matrixes in the light of Onsagers theory of irreversible thermodynamics is shown. Equation for the entropy production in the interdiffusion process is displayed. The presented approach allows calculation of entropy production during interdiffusion, as well as formulating Onsagers phenomenological coefficients for the interdiffusion in an explicit form, a form which is directly correlated with the mobilities of the atoms present in the system.
Analytica Chimica Acta | 2015
Witold Kucza; Juliusz Dąbrowa; Katarzyna Nawara
A numerical solution of the uniform dispersion model in cylindrical channels at low Fourier numbers is presented. The presented setup allowed to eliminate experimental non-idealities interfering the laminar flow. Double-humped responses measured in a flow injection system with impedance detection agreed with those predicted by theory. Simulated concentration profiles as well as flow injection analysis (FIA) responses show the predictive and descriptive power of the numerical approach. A strong dependence of peak shapes on Fourier numbers, at its low values, makes the approach suitable for determination of diffusion coefficients. In the work, the uniform dispersion model coupled with the Levenberg-Marquardt method of optimization allowed to determine the salt diffusion coefficient for KCl, NaCl, KMnO4 and CuSO4 in water. The determined values (1.83, 1.53, 1.57 and 0.90)×10(-9)m(2)s(-1), respectively, agree well with the literature data.
Journal of Alloys and Compounds | 2016
Juliusz Dąbrowa; Witold Kucza; Grzegorz Cieślak; T. Kulik; Marek Danielewski; Jien-Wei Yeh
Ceramics International | 2014
Tomasz Brylewski; Witold Kucza; Anna Adamczyk; Andrzej Kruk; Mirosław Stygar; Michał Bobruk; Juliusz Dąbrowa
Intermetallics | 2017
Juliusz Dąbrowa; Grzegorz Cieślak; Mirosław Stygar; Krzysztof Mroczka; Katarzyna Berent; T. Kulik; Marek Danielewski
Journal of Alloys and Compounds | 2018
Witold Kucza; Juliusz Dąbrowa; Grzegorz Cieślak; Katarzyna Berent; T. Kulik; Marek Danielewski
Scripta Materialia | 2017
Marek Zajusz; Juliusz Dąbrowa; Marek Danielewski
Materials Letters | 2018
Juliusz Dąbrowa; Mirosław Stygar; Andrzej Mikuła; Arkadiusz Knapik; Krzysztof Mroczka; Waldemar Tejchman; Marek Danielewski; Manfred Martin
Journal of Materials Engineering and Performance | 2017
Mirosław Stygar; Juliusz Dąbrowa; Piotr Dziembaj; Tomasz Brylewski
Journal of Materials Engineering and Performance | 2015
Juliusz Dąbrowa; L. Perriere; Mirosław Stygar; Witold Kucza; Ł. Klita; Marek Danielewski