FTIR examination of preservative retention in beech wood (Fagus sylvatica L.)
A method of FTIR examination of preservative retention in beech wood structure was developed. Beech wood samples of different preservative content were prepared using low pressure preservation process in laboratory conditions. Then samples were homogenized in a laboratory mill and measurements were performed using FTIR spectrometer with attenuated total reflectance unit. Pure preservative was also measured and from its spectrum 1,555 cm−1 absorption band was chosen as the characteristic for preservative. 1,027 and 1,370 cm−1 were absorption bands characteristic for wood which were chosen as reference peaks. Values of two absorbance ratios, A1,555/A1,027 and A1,555/A1,370 were correlated with the preservative content in particular samples. Correlation coefficients were 0.8390 and 0.8313, respectively.
Testing content of copper in Scots pine wood (Pinus sylvestris L.) after preservative treatment.
Testing content of copper in pinewood ( Pinus sylvestris L.) after preservative treatment. An attempt was made to vacuum pressure treatment of pinewood ( Pinus sylvestris L.) in laboratory conditions. Wolmanit® CX-10 was chosen as a wood preservative. Copper is the active component in this preservative. The analysis of copper content inside wood samples was made after treatment. Measurements were made on XRF spectrometer with an option of point, linear and mapping analysis. The results show that copper compounds absorption grade inside wood depends in a high degree on the preservative concentration.
Methods of determining the desired frequency characteristics of the automatic control systems
Considered the methods of determining the desired frequency characteristics of the automatic control systems while the synthesis of their corrective devices.