Marek Ziolkowski
University of Szczecin
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Featured researches published by Marek Ziolkowski.
Applied physics | 1976
Marek Ziolkowski; Jan Purczynski; Ryszard Sikora; Modest Gramz
Forces acting on the conductors and inductance of a bifilar lead are determined. The calculations are performed in the bipolar coordinate system on the base of previously obtained results.
40TH ANNUAL REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION: Incorporating the 10th International Conference on Barkhausen Noise and Micromagnetic Testing | 2014
Konstantin Porzig; Matthias Carlstedt; Marek Ziolkowski; Hartmut Brauer; Hannes Toepfer
Numerical modeling of commercial ECT equipment requires preparatory work in reverse engineering. The reconstruction of given ECT probes was performed in terms of (i) geometry, (ii) material properties and source parameters, (iii) impedance computation. High-resolution X-ray images were taken in order to build appropriate CAD models of given ECT probes. An optimization strategy was applied in order to estimate the permeability of the magnetic shield as well as the supply current by means of measurement data of the magnetic flux density. Subsequently, normalized impedance calculations were performed and compared to measurements in generic benchmark models containing artificial defects.
Compel-the International Journal for Computation and Mathematics in Electrical and Electronic Engineering | 2001
Hartmut Brauer; Marek Ziolkowski; Uwe Tenner; Jens Haueisen; H. Nowak
Applies four different minimum norm estimations with common regularization techniques, often used in biomedical applications to the solution of the biomagnetic inverse field problem. Magnetic field data measured with a multi‐channel biomagnetometer sensor system in a magnetically shielded room were used to reconstruct the current density distributions generated by an extended current source which was placed inside a human torso phantom. No one of the tested methods is able to estimate the extension of the source. To improve the results as much as possible a priori information of the source space should be taken into account.
Compel-the International Journal for Computation and Mathematics in Electrical and Electronic Engineering | 2001
Hartmut Brauer; Marek Ziolkowski; Jens Haueisen
We applied minimum norm estimations using different regularization techniques to the solution of the biomagnetic inverse field problem. Using magnetic field data measured with a multi‐channel‐SQUID‐sensor‐system we computed reconstruction of the impressed current density distributions which were generated by extended current sources placed inside a human torso phantom. The common inverse techniques usually applied in modern biomedical investigations in bioelectricity or biomagnetism are compared, and their aptitude for reconstruction of 3D current sources in space was evaluated. We analyzed the impact of using magnetic data, electrical data, and combination of both respectively on the localization of an equivalent current dipole (ECD). Finally, we use a visualization tool which enables a comparison of current density reconstruction. The study is, in parts, related to the new TEAM problem No. 31.
Compel-the International Journal for Computation and Mathematics in Electrical and Electronic Engineering | 1998
Witold Tarczynski; Marek Ziolkowski
Investigations which have been carried out up to the present have shown that trajectories of the arc spot over the extinguishing plate drift always towards the plate axis. Results of calculations presented in this paper are different from the results which have been obtained till now. The calculations have been made with the use of computer programs based on the boundary element method. The results of the calculations show that for some areas of plates of specific shapes potential gradient of a field of forces acting against the arc spot may approach zero. When the arc reaches any point of such an area it is stopped and the arc spot trajectory does not end at the plate axis.
Archive | 2013
Mladen Zec; Robert P. Uhlig; Marek Ziolkowski; Hartmut Brauer
Compel-the International Journal for Computation and Mathematics in Electrical and Electronic Engineering | 1994
S. Gratkowski; Marek Ziolkowski
Compel-the International Journal for Computation and Mathematics in Electrical and Electronic Engineering | 1992
Modest Gramz; Marek Ziolkowski
Archive | 2017
Hartmut Brauer; Marek Ziolkowski; Mladen Zec; Robert P. Uhlig
Original published in: #R#<br/>Compel : international journal of computation & mathematics in electrical & electronic engineering. - Bradford : Emerald (ISSN-p 0332-1649). - 28 (2009) 1, S. 140-153.#R#<br/>DOI: 10.1108/03321640910918940#R#<br/>URL: http://dx.doi.org/10.1108/033216409109189 | 2014
Marek Ziolkowski; Hartmut Brauer