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    Effect of Microwave-Assisted Impregnation on the Leaching Resistance of ACQ in Refractory Spruce Wood
    (North Carolina State Univ Dept Wood & Paper Sci, 2024) Vaydogan, Kubra Gunduz; Kol, Hamiyet Sahin
    Microwave (MW) treatment is an environmentally friendly and time -saving technique with great potential for generating wood -impregnation innovations. In this study, a microwave -assisted impregnation (MWAI) approach was developed to achieve adequate retention and fixing of alkaline copper quaternary (ACQ) in refractory spruce wood. The synergistic effect of MW pre- and post -treatments in the impregnation procedure on wood's compressive strength (CS) and copper leaching resistance and valence conversion was investigated. In conclusion, highintensity MW pre-treatment and low -intensity MW post -treatment provided optimum results for the fixation of copper. Based on the results of the copper conversion assays, the same MWAI procedure is also predicted to give high biological efficiency.
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    Thermal Conductivity Temperature Dependence of Heat-treated Wood at Different Moisture Content Levels
    (North Carolina State Univ Dept Wood & Paper Sci, 2023) Kol, Hamiyet Sahin; Vaydogan, Kubra Gunduz
    Effects of temperature dependence and relative humidity were studied relative to the thermal conductivity of heat-treated pine and heat-treated beech, which are frequently used for building construction. Pine and beech wood were exposed to heat treatment at 180, 200, and 220 degrees C in nitrogen gas for 2 h. As a result, the thermal conductivity values of the heat-treated wood decreased as the temperature of the heat treatment process increased and relative humidity increased. However, thermal conductivity of wood became more stable after heat treatment under relative humidity changes. The thermal conductivity values increased with rising mean plate temperatures, while the temperature dependence of the heat-treated wood was not affected by the relative humidity changes. Consequently, heat-treated wood, with variable humidity without excessive heat changes, can be preferred for the construction of buildings.