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In this work solution surface treatment was applied for producing basalt fiber reinforced PA6 matrix composites. Beyond scanning electron microscopy, static and dynamic mechanical tests, dynamic mechanical analysis of composites was used for qualifying the interfacial adhesion in a wide temperature range. The loss factor peak height of loss factor is particularly important, because it is in close relationship with the mobility of polymer molecular chain segments and side groups, hence it correlates with the number and strength of primary or secondary bondings established between the matrix and the basalt fibers. It was proven, that the interfacial adhesion between basalt fibers and polyamide can be largely improved by the application of silane coupling agents in the entire usage temperature range of composites. The presence of coupling agents on the surface of basalt fibers was proven by Fourier transform infrared spectroscopy. The best results were obtained by 3-glycidoxypropyltrimethoxysilane coupling agent

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International audience[No abstract available

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Coals mined in the Transdanubian region in Hungary have an elevated concentration of (226)Ra, which becomes enriched in the slag after burning. This slag has been used as filling and/or insulating material in building works. The aim of this study was to investigate the radiological situation in this territory in terms of the possible impact of this residual material from coal. Flats in three towns with a coal mine and a coal-fired power plant operating in their neighbourhood were examined. The radionuclide contents (including (226)Ra, (232)Th and (40)K) of the slag used for building were determined, and the slags were categorised according to the international standards and recommendations. The external gamma dose rate and the radon concentration in the sites were measured, and based on these data dose assessments were made. The (226)Ra concentration of the slag was 160-2,893 Bq kg(-1); the indoor gamma dose rates were 82-633 nGy h(-1); the radon concentration measured with a nuclear track detector varied from 29 to 1,310 Bq m(-3); the assessed dose contributions in the three towns were 0.65-1.57 mSv y(-1) due to gamma radiation and 2.2-15.2 mSv y(-1) due to radon.