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Abstract

This paper deals with issues related to tribological processes occurring as a result of excessive wear of the surface of scraper conveyor components caused by the impact of the mined material created during drilling of development or exploitation galleries. One of the most common types of tribological wear is abrasive wear. W ear tests were carried out for hard coal – based abrasive using dry carbon abrasive and a hydrated mixture with 76 and 58% hard coal. Based on the conducted research, it was established that the effects of wear processes are associated with damage typical of wear mechanisms: micro-scratching and micro-fatigue. For the wear variant in the presence of dry coal abrasive, individual scratches caused by the abrasive grains were observed on the surface of the samples. The main reason for this type of damage was the aggregation of quartz, which is one of the basic components of the mineral substance present in the tested hard coal. When hydrated carbon mixtures were used as an abrasive, the surface of the samples also displayed scratches characteristic of the aggregate quartz. A small part of the carbon abrasive was pressed into the scratches. Under the influence of the wear caused by friction, small depressions were also formed, where coal penetrated. The effect of coal pressing into micro-scratches is related to its plastic properties. T ests of the abrasive conducted after the conclusion of wear tests have shown that under the influence of the local increase in temperature and pressure, the hard coal contained in the abrasive can undergo transformations. In the abrasive transformed under friction, small, but measurable changes in the content of the C element in relation to the initial hard coal sample were exhibited.

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Authors and Affiliations

Iwona Jonczy
ORCID: ORCID
Andrzej N. Wieczorek
Jacek Podwórny
Anna Gerle
Marcin Staszuk
ORCID: ORCID
Jacek Szweblik
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Abstract

This article addresses the legal aspects of assessing the age of foreign minors. It is a juxtaposition of the development of international legal standards in this area with the law and practice of the Polish authorities. The basic thesis of this analysis is the statement that Polish law in its current form requires fundamental change with respect to at least three elements. First, it is necessary to extend the methods of age assessment to also include non-medical methods. Secondly, the law should clearly define the legal form in which the age of a foreigner is determined and, at the same time, impose an obligation to provide a foreigner with the results of the assessment. Thirdly, a person concerned should have a direct opportunity to appeal.
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Authors and Affiliations

Joanna Markiewicz-Stanny
1

  1. Institute for Legal Studies, University of Zielona Góra (Poland)
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Abstract

The article outlines an urban concept — an attempt to associate architectural and philosophical thinking about urban form — emphasizing the aesthetic and ethical aspects of development. The author refers to the Aldo Rossi’s theory of the architecture of the city and the concept of architectonic that Immanuel Kant introduced in his Critique of Pure Reason. Attempts were made to show that studying the mutual relations between the idea of beauty, the architecture of the city and ethics of development may be useful in the further search for a new formula for planning cities and regions.
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Authors and Affiliations

Zbigniew K. Zuziak
1
ORCID: ORCID

  1. Rzeszow University of Technology

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