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Number of results: 28
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Abstract

The paper presents the author’s reflection regarding the recent transformations of the city of Krakow. The study is focused on the changes that are novelties or distinctive to the city. The conclusions indicate activities that should be treated by city authorities as challenges for the public management of the metropolitan scale.
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Abstract

The subject of the study are strategies for the development of 9 cities, which are among the strongest centres outside the current capitals of regions (in Polish: voivodeships) in the least-developed Polish regions. These cities can give the chance to activate their surroundings. Good strategies that increase the competitiveness of cities and stimulate development can contribute to this. The aim of the research was to fi nd answers to the questions whether and to what extent the studied strategies: (1) are in line with the definition and methodology of strategic planning; (2) recognize and use specific combinations of developmental factors; (3) can contribute to the development of their surroundings. The research method involved the analysis of the strategic plans in the light of the above questions. The strategies studied are not fully in line with the strategy defi nition. They contain errors and methodological flaws commonly encountered in other strategies. They use the specificity of developmental factors, but without conscious, methodical recognition of their combinations and without exposing them. The author signals methodical problems specific to the strategic planning in territorial units and makes suggestions for planning practice.
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Abstract

In this paper a scaling approach for the solution of 2D FE models of electric machines is proposed. This allows a geometrical and stator and rotor resistance scaling as well as a rewinding of a squirrel cage induction machine enabling an efficient numerical optimization. The 2D FEM solutions of a reference machine are calculated by a model based hybrid numeric induction machine simulation approach. In contrast to already known scaling procedures for synchronous machines the FEM solutions of the induction machine are scaled in the stator-current-rotor-frequency-plane and then transformed to the torque- speed-map. This gives the possibility to use a new time scaling factor that is necessary to keep a constant field distribution. The scaling procedure is validated by the finite element method and used in a numerical optimization process for the sizing of an electric vehicle traction drive considering the gear ratio. The results show that the scaling procedure is very accurate, computational very efficient and suitable for the use in machine design optimization.
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