Borate glasses with PbO and PbCl2 containing Dy3+ ions

Oxychloroborate glasses containing Dy3+ ions in the B2O3–PbCl2–PbO–Al2O3–WO3 system were studied using X-ray diffraction, Raman, FT-IR, absorption, excitation and luminescence spectroscopy. The results concerning glass preparation, short-range order structure and optical properties are reported. X-ray diffraction analysis evidently indicates that the fully amorphous system was prepared. Coexistence of trigonal BO3 and tetrahedral BO4 units was evidenced by Raman and FT-IR spectroscopy. The electronic states belonging to the 4f 9 configuration of trivalent Dy3+ were determined from the absorption and excitation spectra. The luminescence bands at 480, 573 and 662 nm were registered in oxychloride glasses, which correspond to transitions originating from the 4F9/2 state to the 6HJ/2 (J = 11, 13, 15) states of Dy3+

Możliwości edukacji przyrodniczo-kulturowej na obszarach chronionych w Polsce

Pointing out the large scale of tourism in protected areas In Poland, and the related dangers and necessary responses, the author presents the theoretical assumptions and facts concerning natural and cultural education within their borders and in neighbouring areas.Artykuł, wskazując na dużą skalę turystyki na obszarach chronionych w Polsce, związane z nią zagrożenia i konieczne do podjęcia działania, najszerzej prezentuje założenia teoretyczne i realia prowadzenia edukacji przyrodniczo-kulturowej w ich granicach i szeroko pojętym otoczeniu

Selected Aspects of the Research into the Perception of the Tourist Attractiveness of a Given Area, on the Example of Bagna Biebrzańskie

W artykule autorka podejmuje próbę klasyfikacji percepcyjnych badań atrakcyjności turystycznej, których wyniki traktuje jako tło do zaprezentowania metodyki oraz zaakcentowania potrzeby wieloaspektowości i kompleksowości studiów dotyczących waloryzacji

Reversed food chains : humanity, monstrosity and an evolutionary utopia in Colin Wilson's Spider world novels

"Colin Wilson (1931-2013), philosopher, novelist and an "Angry YoungMan" of British literature, is best known for his works on true crime,mystery and the paranormal. He is also the author of several science fictionnovels, among them the cycle Spider World, written over the spanof sixteen years (The Tower [1987], The Delta [1987], The Magician [1992],Shadowland [2003]. Set in a distant future, the cycle begins as a post-apocalypticvision of Earth governed by giant spiders where surviving humansare hunted, eaten or forced into slavery, and those who are allowed to liveare subject to selective breeding and all forms of social surveillance. Thenovels follow the vicissitudes of Niall, a young boy who sets out to defeatthe spiders but turns into an advocate of an inter-species alliance, becomingin the end the ruler of both humans and spiders. (...)

Zarządzanie kadrami w organizacji turkusowej na przykładzie firmy Brewa s.c. w Kaliszu

The article identifid activities in the fild of human resources management carried out in teal organizations, a concept developed by F. Laloux. The Polish company Brewa, from Kalisz, which for several years has been implementing the teal organization rules, was used as an example. Using the categorized interview method with one of the company’s owners, detailed functions which make up the human resources management in this organization were presented and analyzed. The fidings indicated that recruitment and selection were considered as belonging to the most important activities in this area, including the introduction of a new employee to work.W artykule dokonano identyfiacji działań w zakresie zarządzania kadrami, realizowanych w organizacjach turkusowych opisanych przez F. Laloux, na przykładzie polskiej fimy Brewa s.c. z Kalisza, która od kilku lat wdraża w swojej działalności zasady organizacji turkusowych. Wykorzystując metodę wywiadu skategoryzowanego z jednym z właścicieli fimy, zaprezentowano i przeanalizowano szczegółowe funkcje, które składają się na zarządzanie kadrami w wyżej wymienionej organizacji. Za jedno z najważniejszych działań w tym obszarze uznano rekrutację i selekcję, w tym wprowadzenie nowego pracownika do pracy

Replacement of glass-former B2O3 by GeO2 in an amorphous host evidenced by optical methods

Two completely different glass-host matrices containing lead, i.e. borate and germanate glasses doped with erbium were studied. The replacement of glass-former B2O3 by GeO2 in an amorphous host was evidenced by optical methods. The luminescence decay from the⁴I13/2 upper laser state of Er³⁺ ions is relatively short, whereas the up-converted emission signal is reduced definitely in borate glass containing lead due to its high B-O stretching vibrations. The results indicate that germanate glasses containing lead are promising for near-infrared luminescence and up-conversion applications

Miocene quartz sands redeposited on subaqueous and alluvial fans during the Saalian: Interpretation of the depositional scenario at Ujście, western Poland

The 14-m-thick sandy succession at Ujście in western Poland formed during the Odranian stadial of the Saalian glaciation, is exceptional in being very well sorted, almost mono-fractional (fine-grained sands) and mono-mineral (mainly quartz grains) and in lacking Scandinavian erratics. The lower sequence (5 metres in thickness) consists of three stacked packages of clinoforms (inclined cross-stratified sands) and is interpreted as having been deposited on a subaqueous fan in a shallow lake during two phases of rising water levels. The upper sand (9 metres in thickness) with (sub) horizontal stratification was redeposited on a subaerial alluvial fan. Distinctive distributary channels that occur in the uppermost part of the subaqueous fan and in the lowermost portion of the alluvial fan may indicate a change in sedimentation style from subaqueous to subaerial. Moreover, the subaerial position of the fan supports the presence of ice-wedge casts that developed under periglacial conditions in the upper part of alluvial fan. The results of granulometric analysis, rounding and frosting of grains and mineral analysis indicate that the sands are derived from Gorzów Formation of Early Miocene age. The only feasible explanation is that the 14-m-thick unit must have been redeposited during the Saalian glaciation