Paweł Kiełbasa

Impact of pulsed electric field on the quality of unpasteurized beer

This work presents an attempt at determination of the impact of Pulsed Electric Fields (PEF) on the selected quality characteristics of the Czech unpasteurized beer Muderlant. To make this determination possible, the studied material was subjected to the impact of 200, 300 or 400 PEF pulses using a prototype laboratory high voltage generator. The efficiency of the method in relation to reduction of selected microorganisms and to inhibition of their growth was confirmed under refrigeration storage up to 72 (h). Lower beer bitterness and turbidity were also observed after PEF use, which should be considered a beneficial result. However, a negative impact of PEF was observed in terms of lower anti-radical ABTS activity and polyphenol content in the beer.

Determining eyeball surface area directly exposed to the effects of external factors.

This article discusses determining the surface area of eyeballs of men and women exposed to the direct effects of external factors in the working environment. For one eye, the mean surface is 172–182 mm2. The determined surface area can be used in formulas for calculating the exposure of eyeballs to harmful chemical substances in workplace air.

High Frequency Induction Tube Furnace for Determination of Ash Melting Temperature

Abstract The article describes the designed and manufactured tube furnace intended for, inter alia, determining the melting temperature of ash conforming to the standard of ISO-540:2001. The possibility of digital sample observation and several programs controlling the obtainable temperature enable to determine the test cycle in any case (convenient for the researcher). Reduction of testing time allows for the analysis of the observed phenomena, as well as more detailed research plan of samples, where substantial changes have been demonstrated.

Wave channel moisture sensor for biomass materials

This paper presents results of the initial research into application of microwave techniques for measuring the moisture content in wood biomass. The goal of the research was to develop a control system for continuous monitoring of moisture control during the manufacturing process. We propose using a closed, low-energy microwave circuit, through a rectangular flow-through chamber with a unique profile. Results of the initial laboratory testing are promising. They indicate that this technique has the potential for an industrial application and may lead to a development of a simple and cost effective, continuous moisture control system. The research required designing a complex wave channel and high-precision manufacturing to build a laboratory prototype. The research team then conducted extensive testing of the prototype, including microwave leakage impact on the safety of the workplace. The paper also presents qualitative analysis.