In order to explore the mining failure law of deep coal seam floor and clarify the mechanical behavior and energy change in the floor strata during mining, the mechanical properties and energy evolution law of sandstone under cyclic loading with different confining pressures (20, 30, 40 MPa) were studied using the Rock Top multi-field coupling tester. The results are as follows: (1) the hysteresis phenomenon of a rock stress-strain curve under cyclic loading is evident. Moreover, the hysteresis loop migrates to the direction of strain increase, and the fatigue damage caused by cyclic loading has a certain weakening effect on the peak strength of rock; (2) both the number of cycles and the axial strain show a nonlinear change characteristic that satisfies the quadratic function relationship. Among them, the stress level of the rock is the main factor affecting the fitting effect; (3) under the same confining pressure, with an increase in cycle level, the macroscopic deformation of the rock increases, the accumulation of fatigue damage in the sample increases, and the irreversible deformation of the rock increases, which leads to an increase in energy input and dissipation; (4) in terms of elastic energy and dissipation energy, elastic energy plays a dominant role. In the initial cycle, the rock is destroyed, and the rock energy loss is great. After the second cycle, the input energy is mainly stored in the rock in the form of elastic energy, and only a small part of the input energy is released in the form of dissipation energy; (5) the confining pressure can improve the efficiency of rock absorption and energy storage, enhance the energy storage limit of rock, and limit the dissipation and release of partial energy of rock. The greater the confining pressure, the more evident the limiting effect, and the more significant the dominant position of elastic energy; and (6) the change in the energy dissipation ratio can be divided into three stages: rapid decline stage, stable development stage and rapid rise stage. The greater the increase in dissipation energy, the greater the degree of rock damage. The evolution process of the energy dissipation ratio can reflect the internal damage accumulation process of rock well, which can be used as the criterion of rock instability.

The study of human scientific activity is a well-established field of historical investigation. There are numerous publications devoted to the history of science both in the formats of research papers, monographs and encyclopaedias. The present study aims at testing the validity and relevance of computer text analysis for the purpose of making a contribution to these scholarly studies. The content of the phraseological discussion included here is based on several diachronic corpora of American English with special attention paid to the Time Magazine Corpus. This corpus contains all the articles published in Time Magazine in the years 1923–2006 which are available via integrated online software from the English Corpora platform. The lexical analysis identifies collocational patterns of the term science where science is the main collocator whereas attributive adjectives define the scope of reference of the term under discussion. Nominal compounds are also considered. Additionally, this study traces cultural diachronic distribution and frequency trends of both the term science and its phraseological developments with special focus on the names of various sciences accounted for in Time Magazine.

This research aims to present and analyse selected issues of Polish return law and practice in the light of the European Union return policy and against the backdrop of the migration crises of 2015 and 2021-2023, with a return decision placed at the heart of the study. The principal research objective is to examine whether the provisions of the 2013 Act on Foreigners follow the standards established in the EU Return Directive as well as in the case-law of the Court of Justice of the European Union. Another objective is to analyse the interaction between the provisions forming the uniform national return policy, but which originate from different legal systems (national and European ones). To this end “anti-terrorism” and “pushback” cases under Polish law will be assessed. The article thus poses several crucial questions, inter alia whether the Polish law and practice comply with standards established at the European level, especially insofar as fundamental rights of individuals are concerned; whether they contribute to the establishment of an effective EU return policy; and what role harmonisation plays in this process.