Zabiegi przezcewnikowej wymiany zastawek serca często ratują życie pacjentów. Leczenie jest stosunkowo bezpieczne i bardzo skuteczne.

The Bulletin of the Polish Academy of Sciences: Technical Sciences (Bull.Pol. Ac.: Tech.) is published bimonthly by the Division IV Engineering Sciences of the Polish Academy of Sciences, since the beginning of the existence of the PAS in 1952. The journal is peer‐reviewed and is published both in printed and electronic form. It is established for the publication of original high quality papers from multidisciplinary Engineering sciences with the following topics preferred: Artificial and Computational Intelligence, Biomedical Engineering and Biotechnology, Civil Engineering, Control, Informatics and Robotics, Electronics, Telecommunication and Optoelectronics, Mechanical and Aeronautical Engineering, Thermodynamics, Material Science and Nanotechnology, Power Systems and Power Electronics.

Journal Metrics: JCR Impact Factor 2018: 1.361, 5 Year Impact Factor: 1.323, SCImago Journal Rank (SJR) 2017: 0.319, Source Normalized Impact per Paper (SNIP) 2017: 1.005, CiteScore 2017: 1.27, The Polish Ministry of Science and Higher Education 2017: 25 points.

Abbreviations/Acronym: Journal citation: Bull. Pol. Ac.: Tech., ISO: Bull. Pol. Acad. Sci.-Tech. Sci., JCR Abbrev: B POL ACAD SCI-TECH Acronym in the Editorial System: BPASTS.

Ship management is a topic that has rarely been approached in the modern Polish maritime legal sciences. There are numerous reasons behind the present state of affairs but it seems that the foremost one is, that the focus in political, legal and economic discourse is still on the legal aspects of ship ownership. This trend continues despite the fact that today over 73% of world shipping tonnage is managed by the specialized ship management entities. An economic analysis has proven that year after year Poland was ceasing to be a large ship owning nation, it used to be, and that this trend is unlikely to be reversed in the short and mid-term perspective. Poland may, however, still continue to play a vital role in the world of shipping by becoming a ship management centre. This article aims to introduce the Readers to the selected aspects of ship management operations.

The author addresses the comprehensive presentation of his conception of the epistemology of history and the idea of historiographical metaphor by philosopher of culture Artur Dobosz, indicating the areas where their views converge and diverge. He introduces into the discussion the lines which Dobosz omitted, yet which significantly supplement the problem field of the epistemology of history that the author has been developing since the early 1990s.

‘The special military operation’ conducted by the Russian Federation, including the ‘anti-terrorist operation’ in the Black and Azov Seas carried out by its Black Sea Fleet, meets the definition of aggression, which, in addition to violating the UN Charter, also violates the provisions of UNCLOS (Article 301) and the San Remo Manual (general provisions, first three sections). The unilateral announcement (through a navigational warning) of an ‘anti-terrorist operation’, and in fact a sea blockade of Ukrainian ports, is contrary to the content of UNCLOS (freedom of navigation) and does not meet the requirements for methods of fighting at sea (sea blockade, zones - San Remo Manual).
The missile attacks on civilian and protected objects located on the territory of the Ukrainian state, carried out by ships and aircraft of the Black Sea Fleet, as well as artillery and missiles shelling of coastal towns, constitute a gross violation (war crime) of the international humanitarian law of armed conflicts (San Remo Manual). On contrary, the use of unmanned surface vehicles (drones) by the Ukrainian side in the arak on the Sevastopol base is in accordance with the provisions of the Manual (means of warfare at sea). Particular attention in the discussed armed conflict deserves art. 35 (c) UNCLOS relating to the Turkish Straits, which allows Turkey (based on the Montreaux Convention) to significantly influence the strategic and operational situation in the Black Sea by denying the use of the straits to warships (Turkey closed them to warships all flags). The voting procedure for informal members of the UN Security Council should be considered ineffective, which in the discussed case, when the aggressor is a state – a permanent member of the Security Council makes it difficult to apply measures provided for by international law against it and forces the use of ad hoc solutions, such as ‘grain corridors’.

The increasing demand for office space in Moscow, as well as the economic and political conditions in the global context, have contributed to the construction of a multifunctional complex of the Moscow International Business Centre in the Russian capital. The primarily office building complex is an example of activities consisting in the degleration of offices outside the city centre. It is also an attempt to create a prestigious place (including attractive architecture), an element of the city identity indicating a high development level of the state, application of new solutions in the fields of urban planning and architecture (including technique and modern technologies). Key words: Moscow International Business Centre, multifunctional office complex, office building, urban operation, post-industrial reconstruction, Moscow

Bogusław Wolniewicz, inspired by his formal ontology of situations, has put forward a question on semilattices with a unit (A question about joinsemilattices, Bulletin of the Section of Logic 19/3, 1990). The present paper is entirely devoted to this problem in the formulation given by Wolniewicz. First, the meaning of the question is analyzed and its lattice-theoretical and Boolean algebraic contents are exhibited. Second, set-theoretical and topological counterparts of the question are formulated and commented upon.