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Impact of UV-C stimulation of tubers, immersion of potato sticks in water and frying fat type on the content of fat in dry mass of French fries

Sobol Zygmunt, Jakubowski Tomasz, Wrona Paulina

Agricultural Engineering

2020

Vol. 24, No. 1

47--55

The aim of the experiment was to determine the impact of UV-C stimulation of tubers, immersion of potato sticks in water, and a frying fat type on the content of fat in dry mass of French fries. Tests were carried out on Innovator tubers which is one of the most often used cultivator in production of French fries by the European and Polish companies. Radiation of potato tubers with ultraviolet in band C were performed with the use of the original stand for stimulation of biological material with electro-magnetic radiation. A statistical analysis of the obtained results of tests indicates that stimulation of tubers and a type of frying fat had a statistically significant impact on the fat content in dry mass of French fries.

Celem przeprowadzonego eksperymentu było określenie wpływu stymulacji UV-C bulw, zanurzenia słupków ziemniaczanych w wodzie oraz rodzaju frytury na zawartość tłuszczu w suchej masie frytek. Badania przeprowadzono na bulwach odmiany Innovator, która jest jedną z najchętniej stosowanych w produkcji frytek przez firmy europejskie jak również polskie. Naświetlanie bulw ziemniaka ultrafioletem w paśmie C wykonano z zastosowaniem autorskiego stanowiska do stymulacji materiału biologicznego promieniowaniem elektromagnetycznym. Analiza statystyczna otrzymanych wyników badań wskazuje, że stymulacja bulw i rodzaj frytury, miały statystycznie istotny wpływ na zawartość tłuszczu w suchej masie frytek.

Correlation between compressive strengths and water absorption of fly ash cement mortar immersed in water

Huang Qian, Zhao Liang

Archives of Civil Engineering

2019

Vol. 65, nr 3

141--152

The compressive strength and water absorption of cement mortars with different water-binder ratio (0.35, 0.45 and 0.55) and fly ash content (0, 10%, 20% and 30%) under water immersion were investigated, and the correlation between them was further analyzed. The internal microstructure and phase composition of mortar was studied by scanning electron microscopy (SEM) and X-ray diffraction (XRD), respectively. The results show that the inside of mortar mixed with fly ash displayed the loose and porous microstructure. Therefore, the incorporation of fly ash reduced the compressive strength of mortar, especially the early strength, and the strength decreased with the increase of fly ash content, and the water absorption of mortar also increased. There was a linear correlation between the compressive strength and water absorption of mortar with the equation: fc = -3.838β + 62.332, where fc and β represented the compressive strength and water absorption, respectively. Therefore, when the water absorption of mortar immersed in water was measured, its corresponding compressive strength could be preliminarily inferred through this equation, which was of great significance for detecting and identifying the stability and safety of hydraulic structures.