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Thermal and acoustic changes in bee colony due to exposure to microwave electromagnetic field – preliminary research

Zubrzak B., Bieńkowski P., Cała P., Płaskota P., Rudno-Rudziński K., Nowakowski P.

Przegląd Elektrotechniczny

2018

R. 94, nr 12

262--265

The paper presents the results of preliminary research on the influence of the electromagnetic field from microwave range on the population of honeybees, analysing changes in the sounds coming from the hive and temperature trends in the hive. Research was made using two mini-hives, where one was exposed to electromagnetic field and other was a control hive. During the experiment the temperature and acoustic pressure inside the hive was monitored to check if EMF exposure affects any of these factors.

W pracy przedstawiono wyniki badań wstępnych wpływu pola elektromagnetycznego z pasma mikrofal na populacje pszczół poddając analizie zmiany temperaturowe w ulu oraz dźwięki wydobywające się z ulów. Badania przeprowadzono na dwóch mini-ulach, z których jeden poddawano ekspozycji na pole elektromagnetyczne, a drugi był ulem kontrolnym.

Noise exposure of orchestra members measurement uncertainty related to sampling

Rudno-Rudziński K.

Archives of Acoustics

2007

Vol. 32, No. 2

361-366

One of the objectives in workplace noise measurement and assessment practice is to minimize the costs of testing while ensuring that its purpose is achieved, i.e. it is determined if the permissible noise exposure level has not been exceeded. Time reduction results in increased measurement uncertainty whereby the risk that it will be necessary to repeat the tests increases. Noise exposure measurements were carried out in opera orchestra. The technique of equivalent noise level measurement in consecutive one-minute intervals, with full recording of results, was employed. Measurements were performed simultaneously on 8 workstations. The results of the measurements were subjected to a statistical analysis in order to determine the measurement uncertainty associated with performing the measurements by sampling in time intervals of different duration.