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Abstract

The paper contains the economic analysis of the carried out modernisation of the facilities of a water-park consisting in fitting solar collectors for heating of tap hot water and central heating system. The article presents the data showing investment outlays, operating costs and the calculations concerning the payback time.
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Abstract

The paper contains the technical analysis of the carried out modernisation of the facilities of a water-park consisting in fitting solar collectors for the heating of tap hot water and central heating system. The article includes information on the modernisation carried out with a particular emphasis on analysing the way in which the equipment has been selected and technical solutions employed.
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Abstract

The article analyses selected aspects of the technology and logistics used to modernise a coal-fired heating plant to switch to woodchips, which is illustrated with a specific investment. The study presents characteristics of the investment’s heat economy before the modernisation, as well as the assumptions and program of the project. Finally, selected effects of the modernisation have been described
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Abstract

The purpose of this paper is an attempt to reflect on the beginnings of Ukrainian modernism. The article is an analysis of the “Open letter to Ukrainian writers” by Mykola Voronyi and his polemics with a well-known Ukrainian writer, Ivan Franko. This letter, which was published in the journal “Literaturno-Naukowy Wisnyk” in 1901, is a very important document of the epoch, bearing the mark of a literary manifesto. This little note made the Ukrainian intelligentsia aware of the crisis of so-called narodnytstvo poetics and the need for far-reaching modernization of Ukrainian literature. The writer postulated the rejection of adopted schemes in favour of the latest European trends in literature. The attempt to implement the program demands was an edition of Mykola Voronyi’s literary collection, “From the Valleys and Above the Clouds”, which has also been analyzed and discussed in this paper. The author concludes that the “Open letter to Ukrainian writers” can be considered one of the first manifestations of Ukrainian modernism
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Abstract

This paper presents the results on the effects of die-casting process on the strength parameters of castings of the aluminium AlSi9Cu3 alloy belonging to the group of EN AB-46000, made on renovated high pressure die-casting machine. Specimens for quality testing were taken from the places of the casting most loaded during the service. The aim of a research was to prove how the new die-casting process control capabilities influence on the tensile strength of the cast material defined as a value of the breaking force of the specimens. It has been found that it is possible to specify a set of recommended settings valves of second (II) and third (III) phase, which are responsible for filling the metal mould on die-casting pressure machine. From the point of view of the finished cast element, it was noticed that exceeding the prescribed values of valve settings does not bring further benefits and even causes unnecessary overload and reduce the durability of the mold. Moreover, it was noticed that reduction of the predetermined setting of the second phase (II) valve leads to the formation of casting defects again.
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