20.500.12556/RUL-147998 Spremljanje kakovosti hlodovine s konvencionalnimi, dendrokronološkimi in nedestruktivnimi metodami Monitoring the quality and value of European oak logs using conventional, dendrochronological and non-destructive methods European oak logs (Quercus robur, Quercus petraea) from the 15th auction of valuable logs in Slovenj Gradec in 2021 were included in the study. Of the 1,318 auctioned logs, 78 were randomly selected and visually graded into quality classes (A, B, C) according to the National Grading Rules (2017). In parallel, we analysed the wood growth dendrochronologically and the acoustic properties of the logs using the longitudinal vibration resonance method. The logs with the best quality had a larger diameter and, on average, wider annual rings. We confirmed the correlation between the visually determined quality and the obtained price of the logs. Longitudinal vibration velocity (v) and relative acoustic conversion efficiency (RACE) were positively correlated with log quality and price. The frequency spectra of the low-quality logs differed from the theoretical spectra. This study confirms the feasibility of non-destructive acoustic methods for evaluating oak log quality. V raziskavo smo vključili hrastovo hlodovino (Quercus robur, Quercus petraea) s 15. dražbe vrednejših sortimentov okroglega lesa v Slovenj Gradcu v letu 2021. Naključno smo izbrali 78 od 1318 licitiranih hlodov in jih skladno z veljavnim Pravilnikom o merjenju (2017) vizualno razvrstili po kakovosti (A, B, C). Vzporedno smo dendrokronološko analizirali priraščanje lesa ter z metodo frekvenčnega odziva pri vzdolžnem vzbujanju še akustične lastnosti hlodovine. Najkvalitetnejša hlodovina je bila večjih premerov, z več in povprečno širšimi branikami. Potrdili smo povezavo med vizualno določeno kakovostjo in doseženo ceno hlodovine. Hitrost vzdolžnega nihanja (v) in relativna učinkovitost akustične pretvorbe (RACE) sta bili s kakovostjo in ceno hlodovine pozitivno povezani. Frekvenčni spektri pri hlodovini nižje kakovosti odstopajo od teoretičnih. Raziskava je potrdila možnost uporabe nedestruktivnih akustičnih metod za oceno kakovosti hrastove hlodovine. wood European oak logs grading quality price non-destructive evaluation les hrast razvrščanje hlodovine kakovost cena nedestruktivno testiranje true false true Angleški jezik Slovenski jezik Članek v reviji 2023-07-17 13:31:07 2023-07-17 13:31:14 2023-07-18 03:31:42 0000-00-00 00:00:00 2023 0 0 10 str. št. 1 Let. 72 2023 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 630*85+630*812:176.1 (Quercus L.) 2590-9932 10.26614/les-wood.2023.v72n01a07 159001091 RAZ_Straze_Ales_2023.pdf RAZ_Straze_Ales_2023.pdf 1 13FA4378A9A051CE21543C578FD3B1C3 838f81adcf7d7cc8ed501cbedea59d842ed3b9fd3afa65b28789493c5f6e8f06 bc3f97f5-2495-11ee-aeaf-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=171906 https://journals.uni-lj.si/les-wood/article/view/14531 1 70042743-2495-11ee-aeaf-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=171905 Biotehniška fakulteta Les 0 0 0