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The impact of mechanical pre-treatment of wood biomasson drying rate

Głowacki Szymon, Jaros Małgorzata, Sojak Mariusz, Tulej Weronika, Bryś Andrzej, Witek Monika

Chemical and Process Engineering

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2020

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Vol. 41, nr 2

95–-103

EN

The work presents the process of drying wood biomass after pre-treatment involving either debarkingor crushing. The biomass used for research came from a robinia species wood. The material was driedin free-convection, at the drying medium temperatures of 40, 50, 60, 70 and80◦C, respectively. Pre-treatment proved to have a significant impact on the drying rate, including the time required to reachmoisture content of 10%, essential to start further treatment of biomass for power industry purposes.It was found that debarked samples of robinia lost water more quickly than the crushed ones. Samplesthat did not undergo pre-treatment took the longest time to dry.

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In Memoriam of Professor Stanisław Pabis

Jaros Małgorzata, Markowski Marek, Myhan Ryszard

Technical Sciences / University of Warmia and Mazury in Olsztyn

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2019

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nr 22(4)

291--293

EN

Professor Stanisław Pabis passed away suddenly on September 13, 2019, at the age of 94. We lost an outstanding scientist in the field of Biosystems Engineering who founded the scientific school of methodology of empirical sciences and who made a significant contribution to the development of systems engineering in agriculture and food processing.

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Identification of representative segment of root for colour determination of carrot

Jaros Małgorzata, Słowik Mateusz, Golisz Ewa, Janaszek-Mańkowska Monika

Technical Sciences / University of Warmia and Mazury in Olsztyn

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2019

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nr 22(2)

109--118

EN

The aim of the work was to verify hypothesis that colour of longitudinal section of carrot root may be represented by a selected segment of root or a cross-section. An image analysis was based on image data obtained for longitudinal sections of carrot roots using flatbed scanner and graphics editing software. Colour images were acquired into sRGB colour space and converted to CIE Lab. Sixteen segments of equal height were separated over whole length of root image. The colour difference metric was determined to present how colour of each segment differs from the mean colour of whole root. The root section was considered to be representative for whole root if colour difference metric was the least. The analysis of results confirmed a research hypothesis and allowed for finding representative section which was located at 10⁄16 of total root length measuring from the carrot root head.