Search Results

1 - 3 of 3 items

  • Author: Zbigniew Chmielewski x
Clear All Modify Search

Abstract

The paper presents results of research related to familiarity and understanding of home hospice term and shows how the social media discourse of palliative care looks like. Answers and conclusions are crucial for palliative care organisations as their existence depends on donors financial support which engagement is strongly related to communication activities performed by those organisations.

In the paper there has been presented opinions about public discussion about terminally ill children and its potential need for being treated as a taboo. The data whether futile medical care should be performed whatever the cost is also shown in the paper. Researchers asked also who should be responsible for executing management of hospices in Poland. The main conclusions focus on the necessity to intensify communication activities, especially by the professionals.

Abstract

The magnetic flux leakage (MFL) technique is extensively used for detection of flaws as well as for evaluation of their dimensions in ferromagnetic materials. However, proper analysis of the MFL signal is hindered by the MFL sensor velocity causing distortions of this signal. Traditionally measured components of the MFL signal are particularly sensitive to the scanning velocity. In this paper, an another signal – the gradient of the normal component of magnetic flux density – was proposed as it is less sensitive to the scanning velocity. Results obtained for scans of the steel plate with artificially manufactured flaws confirm this statement.

Abstract

The change in the dislocation density, induced by plastic deformation, influences strongly the magnetic domain structure inside the material. Being so, classic parameters, like the coercivity or magnetic permeability, can be a good measure of the deformation level, yet their reliable determination in a non-destructive way in industrial environment is problematic. The magnetoacoustic emission (MAE) which results from the non-180° domain walls (DW) movement in materials with non-zero magnetostriction can be used as an alternative. The intensity of the MAE signal changes strongly as a result of plastic deformation for both tensile and compressive deformation. It is however possible to discern those cases by analysing the changes in the shape of the MAE signal envelopes. The set of the martensitic steel samples (P91) deformed up to 10% (for both tension and compression) was investigated. Due to geometrical limitations imposed by the special mounting system, enabling compression without buckling, the sample had the shape resulting in low signal to noise (S/N) ratio. Being so the optimization of FFT filtering and wavelet analysis was performed in order to improve sensitivity of the proposed method of deformation level determination.