Friday January 31 Wubin Weng will defend his PhD-thesis with the title "Optical Diagnostics for Quantitative Potassium Chemistry in Biomass Thermochemical Conversion Processes". The dissertation will take Place 9:15 am in Hall Rydberg at the Dept. of Physics, Professorsgatan 1, Lund University. The doctoral thesis is available at the Department. Opponent appointed by the Faculty is Prof. Mikko Hupa, Åbo, Finland.