Generalized observers are proposed to relax the existing conditions required to design Luenberger observers for rectangular linear descriptor systems with unknown inputs. The current work is focused on designing index one generalized observers, which can be naturally extended to higher indexes. Sufficient conditions in terms of system operators for the existence of generalized observers are given and proved. Orthogonal transformations are used to derive the results. A physical model is presented to show the usefulness of the proposed theory.

Trace fossils Phymatoderma melvillensis isp. nov., Thalassinoides isp., ?Nereites isp. and Planolites isp. are reported from the glacio−marine sediments of the Cape Melville Formation (Lower Miocene) of King George Island, West Antarctica. Their occurrence and strong bioturbation of sediments point to an offshore or deeper (outer shelf or upper slope) en− vironment. Deep marine crab Antarctidromia inflata Förster, 1985, has been found in Thalassinoides isp. The tracemaker (?crustacean) of Phymatodermamelvillensis re−reworked pelletal sediments probably during times of food deficiency.

While considering the anthropological and sociological aspects of development of the historic city of Zamość , it is necessary to mention the elements of its residents’ life that brought intellectual values in the cultural space of the city entered in 1992 into the List of World Cultural Heritage. The paper has recalled a unique meeting place of the Zamość intelligentsia in the years 1957–2003 – the Ratuszowa café. It was located in the very heart of the city, in the Zamość Town Hall. The paper proves that it was not only a place of careless entertainment but of creative debate and work. It has also evoked memories of the “café life” and regular visitors to coffeehouses in Lviv, Krakow and Warsaw

Hobby magazines represent a segment of the Polish press characterized by an undiminishing diversity — as shown by their eye-catching presence on library and press saloon shelves. However, that subsection of the Polish media has so far attracted little attention from reserchers. The goal of this article is to examine the phenomenon of the hobby magazines in the context of the current market conditions and to outline a research plan of the field.