Kazimierz Wielki University in Bydgoszcz

About: Kazimierz Wielki University in Bydgoszcz is a education organization based out in Bydgoszcz, Poland. It is known for research contribution in the topics: Luminescence & Population. The organization has 1109 authors who have published 2923 publications receiving 19548 citations. The organization is also known as: Casimir the Great University & Uniwersytet Kazimierza Wielkiego w Bydgoszczy.

A Presentation Room in the Virtual Building of the First National Theater of Hungary

Abstract: In this paper, we describe a presentation room created in a three-dimensional model of the first National Theater of Hungary and developed in the virtual reality engine MaxWhere.

Agnieszka Kinas-Zalewska (rec.): Robert Opora, Resocjalizacja: wychowanie i psychokorekcja nieletnich niedostosowanych społecznie

Abstract: Recenzja publikacji: Robert Opora, Resocjalizacja: wychowanie i psychokorekcja nieletnich niedostosowanych spolecznie , Oficyna Wydawnicza „Impuls”, Krakow 2010.

Effect of multiple injection moulding on some properties of polycarbonate

Abstract: Purpose: The aim of this work was to investigate the influence of multiple (up to 6 times) injection moulding of polycarbonate (PC) on some properties of the obtained moulded pieces. The investigation results are to be used to evaluate the usefulness of the multiple processing of PC and management of the PC technological waste by material recycling. Design/methodology/approach: The investigated samples were obtained during the industrial injection moulding. There were determined the sample mechanical properties (by a tensile test), melt flow rate, temperatures of phase transitions (by differential scanning calorimetry, DSC), temperatures of thermal degradation (by thermogravimetric analysis, TGA), as well as storage modulus and damping coefficient (both by dynamic mechanical analysis, DMA). Findings: After the first and second injection mouldings, minor increases (ca. 2.2 wt.% in sum) in the tensile strength of polycarbonate were observed. After the next injection mouldings, this quantity did not change much. The melt flow rate increased along with the number of injection mouldings. The glass temperature was approximately constant while the other phase transition temperatures decreased by ca. 7o C after the first injection moulding and they did not essentially change after each of the next five processing procedures. The storage modulus and damping coefficient of polycarbonate were not noticeably affected by the number of injection mouldings. Research limitations/implications: In order to confirm the claim that degradation processes, occurring in polycarbonate during the first two injection mouldings, cause an increase in the van der Waals interactions between the polymer macromolecules, further investigation is necessary, mostly that on variations in the mean molecular weight of polycarbonate. Practical implications: The studies carried out by now indicate that there are no arguments not to subject the polycarbonate technological waste to the management by material recycling. Originality/value: The method for calculating the fraction of multi-processed plastic in a final product is presented. It has been observed that the largest changes in the examined properties of polycarbonate occur during its first injection moulding. It is stated that a minor degradation of polycarbonate macromolecules increases slightly its tensile strength, caused probably by enhancement of the van der Waals forces.

New types of composite scintillators based on the single crystalline films and crystals of Gd3(Al,Ga)5O12:Ce mixed garnets

Abstract: This work presents the results of creation of novel composite scintillators based on the Gd3Al5-x GaxO12:Ce (x = 1.16–2.67) single crystalline films (SCF), grown by the LPE method onto Gd3Al2.5 Ga2.5O12:Ce single crystal (SC) substrates. The scintillation properties of film/crystal epitaxial structures were investigated under α–particle and γ–quantum excitations. Under α–particle excitation, the light yield of mentioned SCF scintillators is significantly less than that in their substrates due to the influence of Pb2+ flux contamination and formation of Pb2+-Ce4+ centers. Meanwhile, these SCF scintillators under α–excitation possess significantly faster decay kinetics than that of their substrates under γ–excitation. Therefore, the Gd3Al5-xGaxO12:Ce SCFs (x = 1.16–2.67) /Gd3Al2.5Ga2.5O12:Ce SC epitaxial structures can be used as composite scintillators for simultaneous registration of the components of mixed ionizing fluxes, specifically for detection of α–particles (SCF) and γ–quanta (substrate). The separation of the response from the SCF and substrate parts of composite scintillators under α–particle (241Am) and γ–quantum (137Cs) excitations occurs at large tγ/tα = 1.7–4.2 ratio.