The evaluation of complex radiation impedance for a square piston source on an infinite circularcylindrical baffle is associated to the Greenspon-Sherman formulation for which novel evaluation methods are proposed. Unlike existing methods results are produced in a very wide range of frequencies and source semi-angles with controllable precision. For this reason closed-form expressions are used to describe the truncation errors of all integrals and infinite sums involved. Impedance values of increased accuracy are also provided in tabulated form for engineering use and a new radiation mass-load model is derived for low-frequencies.

It was with great sadness that we learned on 18 October 2021 of the death of the distinguished Italian Slavist and Polonist Sante Graciotti, professor emeritus of the Sapienza University of Rome. This personal tribute, written on the first anniversary of his death, begins with a recollection of the ceremony of awarding Sane Graciotti the title of Doctor honoris causa by the Jagiellonian University. on 16 December 1986. The laudatio, delivered by Professor Tadeusz Ulewicz, presented our guest's achievements and the main stages of his academic life. It began with the study of Italian philology at the Università Cattolica del Sacro Cuore in Milan and came to a turning point at La Sapienza in Rome, where he pivoted towards Slavic philology. The youthful fascination became a lifelong commitment which earned him the acclaim and honours that are the crown of an academic career. Finally, he concentrated his attention on Poland, Polish history and culture, and the history of Polish-Italian cultural relations. In his explorations of the new field, he could count on the friendly assistance of his Polish colleagues, especially Tadeusz Ulewicz, a historian of Polish literature with a profound knowledge of the historical ties between Poland and Italy. The respect they had for each other's work led to the promotion of Graciotti's research in Poland and the awarding of the doctorate honoris causa to Tadeusz Ulewicz by the Università Cattolica in Milan.