In spite of existing European and national legislation aimed at noise abatement, public interest and concern about noise are high. The EU Directive 70/157/EEC [15] for setting and controlling environmental noise is aimed at creating less noisy and more pleasant environment for European residents within "Sustainable Development in Europe". The authors are presenting a methodology for measuring selected acoustic descriptors (sound absorption coefficient and sound transmission loss) for acoustic materials, which are currently in process of development. Emphasis is put on sandwich structures of absorbers. Verification results of the proposed methodology are presented.
Concerning with an actual situation in the exploitation of technological waste, this contribution deals with the properties analysis of moulded parts made of thermoplastics containing added regrind. The aim of the experiments was to analyze mechanical properties of plastics with various percentage of added regrind into basic material. Material PBT (polybutylene terephthalate), mineral composite with 30% glass fiber, was used for experimental testing. The plastics specimens were made by injection moulding and tested by chosen mechanical properties. The yield of tested material had tendency to decline with added amount of regrind. Addition of regrind had no impact on change of tensile strength and hardness of tested materials with regrind. The values of Charpy impact test had decreasing tendency with increasing rate of regrind. The utilization of regrind at the production of new moulded parts is important from aspect of reduction plastics waste and pollution abatement of environment.
Her research interest includes acoustics and psychoacoustics. She received M.Sc. degree in environmental engineering from Technical University of Kosice in 2011. She was the member in organization committee of ICEEE conference (International Council of Environmental Engineering Education) in 2011. Miroslav Badida, Dr.h.c. prof. Ing. PhD. He is a graduate of Mechanical Faculty of Technical University of Košice. His scientific and research work focuses on the field of environmental engineering. An accent is put on the issue of environmental management systems, ecologization of products and their production and life cycle analysis of products. Lately his attention is paid on research in the field of physical factors of working and living environment.
Sound is an alternative name for acoustic wave which is possible to make the human sensation. This article deals with noise which is every annoying, harassing, annoying, undesirable, inappropriate or harmful sound. Noise is also defined as an audible sound which either disturbs the silence or an intentional sound listening or leads to annoyance. In this article is described some psychoacoustics parameters and also the superposition of sound by two experiments.
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