Polysyklisiä aromaattisia hiilivetyjä (PAH-yhdisteitä) esiintyy kaikkialla ympäristössä. Ne syntyvät epätäydellisen palamisen seurauksena, esimerkiksi vulkaanisessa toiminnassa sekä fossiilisten polttoaineiden poltossa. ...
Pollen competition arises from differences among pollen donors in pollen-tube growth rate. According to the pollen competition hypothesis, only the fastest-growing pollen tubes are assumed to achieve fertilization. By this ...
The purpose of this work was to determine the optimal welding time for linear friction welding of birch (Betula pendula L.) wood while keeping the other parameters constant and at similar levels compared to other species ...
Sulfur-free pulping has an environmental advantage over the traditional kraft process. This article describes the combustion properties of the black liquors produced from silver birch (Betula pendula) sawdust using three ...
