Leszek Fracckowiak and Ryszard Strzelecki
Examines some basic aspects of hybrid filters, operating effectively when current pulsations of a non‐linear variable load occur. The operation of two hybrid filter systems, each…
Abstract
Examines some basic aspects of hybrid filters, operating effectively when current pulsations of a non‐linear variable load occur. The operation of two hybrid filter systems, each equipped with an active power filter, working as: a) a controlled additional current source, b) a controlled additional voltage source, recognized by the authors in previous publications as the most advantageous solution has been examined. For both systems, vectorial equations in α,β co‐ordinates, describing their operation, have been presented. On the basis of these equations a common frequency model of three‐phase three‐wire hybrid filters has been elaborated. This model has been used for the evaluation of the filtration efficiency of line current harmonics, taking into consideration the applied methods and algorithms to separate filtered harmonics, above all at a pulsating load current. Some conclusions from the theoretical analysis have been verified by simulation of a line loaded by converter with an output current pulsating at frequencies 10 and 20Hz.
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Agnieszka Chwieduk and Izabela Skórzyńska
The aim of the authors’ text is to consider the ethics of care in the context of academic performative didactics, to which the authors dedicated the book Performative Didactics…
Abstract
The aim of the authors’ text is to consider the ethics of care in the context of academic performative didactics, to which the authors dedicated the book Performative Didactics for Humanists. A Matter of Coincidences published in 2021 would describe, despite the different academic disciplines the authors represent (history and anthropology), as practicing care. As part of (teachers') history teaching, it was work with migration memory consisting in performative processing of migration narratives into the form of a joint undertaking of university and primary school students, which was their performative reading. In the case of (engaged) anthropology, the efforts were based on volunteering, as an activity for the benefit of people migrating and detained against their will in Secure Centers for Foreigners (SOdC). In both cases, taught in a performative way, the students were confronted with the unpredictable effect of their actions (the teaching axis) while their emotional, cognitive and creative resources were mobilized. Most importantly, achievement thereof was a reward in itself. The relevant context in which the authors consider care as a subject of study is the war in Ukraine and its impact on women's lives. In the authors’ opinion, “ethics of care and justice” require reconsideration and social practice through education.