20.500.12556/RUL-172831 Temperaturne nehomogenosti v tkivu med in po obdelavi s pulznimi električnimi polji Temperature inhomogeneities in tissue during and after pulsed electric fields treatment V diplomski nalogi preučujem temperaturne spremembe v rastlinskem tkivu med in po obdelavi s pulznimi električnimi polji (PEF). Preverjam tudi, ali pri tem nastajajo temperaturne nehomogenosti, ki vplivajo na enakomernost in učinkovitost postopka. Kot modelni tkivi sta bila uporabljena krompir in korenje. Obdelava je potekala z osmimi pulzi trajanja 100 µs pri frekvenci 1 kHz in napetostih 500, 650, 800 in 1000 V. Za vsako kombinacijo tkivo–napetost so bili izvedeni trije ponovitveni poskusi (n = 3). Temperaturo sem merila z optičnimi vlakenskimi senzorji v štirih kanalih, nameščenih bočno glede na elektrode in medsebojno oddaljenih približno 3 mm. Dobljeni podatki so bili analizirani v programu MATLAB. Rezultati kažejo, da apsolutni prirastek temperature z napetostjo narašča nelinearno in da segrevanje ni povsem homogeno: razlike med kanali se z napetostjo povečujejo in niso zanemarljive. Statistična analiza potrjuje, da so temperaturne razlike med kanali pri isti napetosti v večini primerjav statistično značilne p < 0.05, z nekaj izjemami pri nižjih napetostih. Statistično značilne so tudi razlike med napetostmi znotraj istega kanala. Primerjava tkiv pokaže, da so v krompirju prirastki temperature večji, a bolj dosledni, medtem ko se v korenju pri višjih napetostih pojavijo izrazitejše razlike med kanali. Ugotovitve prispevajo k boljšemu razumevanju vpliva mikrostrukture tkiva na toplotne odzive med PEF-obdelavo ter predstavljajo osnovo za optimizacijo industrijskih procesov. In this thesis, I investigate temperature changes in plant tissue during and after treatment with pulsed electric fields (PEF), with a particular focus on the occurrence of temperature inhomogeneities that may affect process uniformity and efficiency. Potato and carrot were selected as model tissues. The treatment was carried out using eight pulses of 100 µs duration at a frequency of 1 kHz and voltages of 500, 650, 800, and 1000 V. For each tissue–voltage combination, three replicates were performed (n = 3). Temperature was measured with fibre-optic sensors placed laterally to the electrodes at four positions, spaced approximately 3 mm apart. The collected data were analysed in MATLAB. The results show that the absolute temperature rise increases nonlinearly with voltage and that heating is not fully homogeneous: differences between measurement positions become more pronounced with increasing voltage and are not negligible. Statistical analysis confirms that, in most comparisons, temperature differences between channels at the same voltage are statistically significant (p < 0.05), with some exceptions at lower voltages. Significant differences were also observed between voltages within the same channel. A comparison of tissues indicates that in potato, temperature rises are greater but more consistent across the voltage range, whereas in carrot, at higher voltages, pronounced differences between channels emerge. These findings contribute to a better understanding of how tissue microstructure affects thermal responses during PEF treatment and provide a basis for optimising industrial processes where uniform and controlled treatment of biological materials is essential. Pulzna električna polja (PEF) temperatura nehomogenost krompir korenje elektroporacija. Pulsed electric fields (PEF) temperature inhomogeneity potato carrot electroporation. true false false Slovenski jezik Angleški jezik Diplomsko delo/naloga 2025-09-11 12:05:00 2025-09-11 12:05:05 2026-02-09 10:08:44 0000-00-00 00:00:00 2025 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 62873 267742979 Temelkova_Mihaela_-_Temperaturne_nehomogenosti_v_tkivu_med_in_po_obdelavi_s_pulznimi_elektricnim.pdf Temelkova_Mihaela_-_Temperaturne_nehomogenosti_v_tkivu_med_in_po_obdelavi_s_pulznimi_elektricnim.pdf 1 DCB7FC2EF554DA12CAD9FE763DE646B6 bffa7c204fd03d09f3ffb8a679963e105908a5c713efaec101d39ccc211d3c5e a118bac7-8ef6-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=216928 Fakulteta za elektrotehniko 0 0 0