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.

Dzięki skonstruowaniu detektorów odbierających fale grawitacyjne możliwe jest penetrowanie najdalszych zakątków Wszechświata w poszukiwaniu czarnych dziur i gwiazd neutronowych.

Fale grawitacyjne nie są rzadkim zjawiskiem, które występuje w kosmosie raz na jakiś czas. Powstają one w następstwie różnych kosmicznych wydarzeń i przebiegają przez Ziemię bardzo często. Badanie ich genezy jest bezcennym źródłem wiedzy o kosmosie.

The author presents a sketch of the history of concepts and imaginative geography of the lands located in the hereafter: earthly and heavenly Paradise, Purgatory and Heaven. He reaches back to the origins of these images in ancient Eastern cultures, the culture of Antiquity, and patristic writings. He traces their development throughout the Middle Ages to the time of Dante, whose La Commedia sanctioned the separation of the hereafter into topographically located Hell, Purgatory and Paradise.