Andrzej Wac-Włodarczyk

Aging tests of amorphous current transformers used in ground fault interrupters

It is pointed out that the magnetic material for cores of a differential current transformer (DCT) of a ground fault interrupter (GFI) should be characterized by high initial permeability, little dependence on temperature, and a low remanence. These parameters have been taken into consideration during selection of the most suitable annealing regime of Co-based (CoFeMnMo)/sub 77/(SiB)/sub 23/ material. It is assumed that a GFI is required to have a service life of 20-years continuous operation. Hence, the magnetic properties of the core of the DCT must be highly stable and exhibit virtually no deterioration over this period. During its operational lifetime, the core may be subjected to rapid saturation due to short circuits and earth faults, etc., as well as cyclic temperature changes. The effects of temperature aging and high current transients on the performance of the DCT were investigated. It is concluded that current shocks do not significantly alter the small-signal magnetic permeability of Co-based amorphous cores of selected annealing. The material examined exhibits degradation of magnetic properties due to aging greater than that reported for Fe-based materials. >

The investigation of electromagnetic field influence generated by mobile phones on cardiac pacemakers with the anatomically based human model

Purpose – The aim of this paper is to investigate the coupling model which describes the relationship between the electromagnetic (EM) field emitted by a field source, in this case the mobile phone, and the interfering voltage at a cardiac pacemaker which is digitally implanted into the human body model.Design/methodology/approach – The research was carried out using two kinds of numerical phantoms with various configurations, i.e. the mobile placed in front of a trunk and the mobile placed near the human ear (totally 12 configurations). Moreover, the simplified homogeneous human model with numerically implanted cardiac pacemaker is considered (two configurations). The simulations are carried out using the finite difference time domain method according to international standards.Findings – From the investigation it was found that the interfering voltage at the cardiac pacemaker (for each of the considered models) was much smaller than the one proposed by IEC standard. A practical conclusion that can be dr...

Best practices applicable as a means to ensure high quality of education at the EIE area

The article outlines the most important information concerning didactic, scientific and organizational procedures that have been introduced at Electrical and Information Engineering Department of Lublin University of Technology in order to provide high quality of education level. Those tasks have been determined by both statute of the Lublin University of Technology and particular objectives of each of the scientific units that have been operating in the structure of the EIE Department. Among them, there have been discussed such topics as realizing the process of education on Electrical Engineering and Information Engineering courses, keeping curricula up to date accordingly to the newest requirements of the labour market and developing the idea of additional classes for voluntary students, particularly interested in a specific part of the knowledge. Subsequently, the paper presents crucial data connected with conducted scientific research, including information about papers submitted to Organizing Committees of many international conferences by particular authors. Finally, activities in the field of knowledge transfer and academic entrepreneurship also have been described. It has been necessary to describe such form of academic entrepreneurship activity as Business Incubator of Lublin University of Technology. The most interesting tendencies have been presented in graphs and diagrams and then discussed. In conclusion part authors try to designate the way of evolution of the University and indicate fields which will maintain an expansive tendency as well as suggest sectors which will lose their importance from the global Universitys aims point of view. Evaluation of realized objectives also was conducted.

A feedback from the graduates as a basis of quality of education assessment. case-study research at Lublin University of Technology

In the most cases the process of assessing a quality of education level is connected with some popular procedures such as evaluation, accreditation, auditing or different ones. Certainly, their objectivity could be discussed from different points of view and many aspects could be taken into consideration in order to specify the most suitable, universal and objective criteria. Nonetheless, it could be noticed that during assessing quality of education level very often not enough attention is paid to the situation of people who finished their study at the evaluated university. For that reason at the Faculty of Electrical and Information Engineering of Lublin University of Technology some internal research was started. Within its scope was to examine the quality of education, considering different social aspects of graduated students as the primary criteria of the assessment. As the result of this research, it was possible to recognize what changes need to be introduced, to make the process of education more effective and to improve the usefulness of technical knowledge taught at Lublin University of Technology. This article outlines some aspects concerning conducting research mentioned above and presents obtained results followed by conclusions and recommendations.