20.500.12556/DiRROS-7601 Vpliv temperature termične obdelave na dielektrične lastnosti lesa Influence of thermal treatment temperature on the dielectric properties of wood V prispevku so predstavljeni rezultati vpliva temperature termične obdelave nadielektrične lastnosti bukovine (Fagus sylvatica L.) in smrekovine (Picea abies L.). V eksperimentu smo uporabili diskaste preskušance premera 45 mm in debeline 5 mm, ki smo jih termično obdelali pri sedmih različnih temperaturah (50 do 200 °C). Dielektrične lastnosti preskušancev smo ugotavljali pri devetih različnih frekvencah (2 do 10 MHz). Vse meritve smo opravili pri sobnitemperaturi z impedančnim analizatorjem HP 4191A RF po metodi z mikrometrom, na katerega sta bili pritrjeni diskasti aluminijasti elektrodi. Na osnovi dobljenih rezultatov smo ugotovili, da se dielektrična vrednost lesain izgubni kot zmanjšujeta z naraščajočo temperaturo obdelave, če je le-tavišja od 100 °C. Dielektrična vrednost lesa je nižja pri večji izgubi mase preskušanca. The effect of thermal treatment temperature on the dielectric properties of beech (Fagus sylvatica L.) and spruce (Picea abies L.) was investigated. Wood disks with a diameter of 45 mm and a thickness of 5 mm were thermally treated at seven different temperatures (50 to 200 °C) before measurements were performed. Dielectric properties of the wood disks were measured at nine various frequencies (2 to 10 MHz) at room temperature. The impedance analyzer HP 4191A RF and the micrometer screw method with circular aluminum electrodes were used. The results indicate that the dielectric constant and the loss tangent of wood decrease as the temperature of the thermal treatment increases, provided the temperature is higher than 100 °C. The dielectric constant also decreases with increasing weight loss of the specimen. dielektrične lastnosti temperatura segrevanje les visoka frekvenca dielectric properties temperature heating wood high-frequency true false true Slovenski jezik Ni določen Znanstveno delo 2017-07-12 09:18:31 2017-07-12 09:18:31 2022-08-12 14:05:32 0000-00-00 00:00:00 2004 0 0 str. 123-135 Vol. 73 2004 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 630*812.8+176.1 Fagus sylvatica L.:174 Picea abies L.(045) 0351-3114 URN:NBN:SI:doc-ZN0BRN8I 1268902 6206978 RAZ_Jost_Matej_i2004.pdf RAZ_Jost_Matej_i2004.pdf 1 30033350B65B76715F5BDE925B9ED854 035e3a81b441d07fdf6adc4c62a8577637c907782b490c3ecc815b43efa9de19 1c8f7ac9-17b5-11ed-b6b8-001a4af901a5 20.500.12556/dirros/1cb324f7-e10e-458b-801b-2e6e53811a50 https://dirros.openscience.si/Dokument.php?lang=slv&id=9468 Gozdarski inštitut Slovenije Acta Silvae et Ligni 0 0 0