VI 2015

Studying influence of element Gd3+ on the magneto-optic properties of the tellurite glass 
This paper presents the results of research on the tellurite oxide glasses containing Gd3+ elements addition. The evaluation of the magnetic properties of the investigated materials was based on the determination of the dominant type of magnetic order by measuring the DC magnetic susceptibility. Their magneto-optic properties were determined on the base of the Faraday effect measurements and Verdet constant calculated from the turn angle of the surface light polarization. The results of magnetic susceptibility measurements indicate the change in the nature of magnetic ordering induced by the addition of gadolinium ions. Parent glass Te2 is a typical paramagnetic. The addition of gadolinium ions to the parent glass caused the change in magnetic ordering from paramagnetic to diamagnetic. With the change in the nature of magnetic ordering magneto-optic effect is reduced. An increase amount of point defects and an increase of average volume defect sizes that was observed on the basis of PALS, and a small value of magnetic susceptibility in this case may influence such behavior of the magneto-optic effect. The obtained results can provide important advises on the development of new materials possess unique magneto-optic properties for applications in optoelectronic devices.
Edmund Golis Ph.D.

Kurt Randhahn's artistic pottery workshop in Bolesławiec – a forgotten episode from the Art Nouveau period
Kurt Randhahn, was a lecturer in the Ceramic Vocational School of Bolesławiec, and also managed an artistic pottery in this city between 1899 and 1906. What distinguished it from other works, was the elegant and exclusive assortment of products (vases, jugs, bowls, fi gurative works), decorated with drip glaze, opaque glaze, half-opaque, so-called alabaster glaze, mirrors glaze and modern paint layers. The works were created on the basis of the designs made by Berlin sculptors: Arthur Lewin-Funcke, Konstantin Stark, August Gaul and Carl Stork, as well as artists from Bolesławiec: Ernst Heinecke and Hermann Knauer. Randhahn’s ceramics was highly appraised by critics and won numerous awards, among other things: a honorary diploma on the 1st International Modern Decorative Arts Exhibition in Turin in 1902 and a silver medal on the World Exhibition in Saint Louis in the United States in 1904.
Anna Bober-Tubaj M.Sc.

Test methods for slip resistance of ceramic tiles used in Poland
The article shows how important is slip resistance parameter of ceramic tiles and presents two test methods for this parameter - using a platform with a ramp to specify the maximum inclination angle of the examined surface and determining the dynamic coeffi cient of friction.The paper presents results interpretation of ceramic tiles slip resistance using a platform with a ramp carried out in different laboratories. Based on the analysis of these methods and test results suggest that an objective method of testing slip resistance of ceramic tiles is determination of the dynamic coeffi cient of friction.
Lucyna Badura Ph.D. Eng.

The influence of ecological characteristics of energy sources on environmental burden accompanying fl oat glass manufacture
This paper presents an analysis of a potential impact of electric energy from selected primary energy sources and natural gas from various European countries on environmental burden generated by the fl oat glass production process. In case of the group of European countries taken under consideration the range of values of the cumulated Pt index was relatively wide, from 98.5 Pt/t to 134 Pt/t of glass sheets. Lower burdens were predicted for electric energy generated from renewable primary energy sources and nuclear energy. It has been shown that it is ecologically more
advantageous to satisfy energy needs of the manufacturing process with natural gas than with electric energy.
prof. UTH Ryszard Świetlik Ph. D., Artur Molik Ph.D.