As they descend, the autorotating seeds of maples and some other trees generate unexpectedly high lift, but how they attain this elevated performance is unknown. To elucidate the mechanisms responsible, we measured the three-dimensional flow around dynamically scaled models of maple and hornbeam seeds. Our results indicate that these seeds attain high lift by generating a stable leading-edge vo...

We determine the asymptotic distribution of p-rank sandpile groups random bipartite graphs. see that this depends on ratio between number vertices each side, with a threshold when sides is equal to $$\frac{1}{p}$$ . follow approach Wood (J Am Math Soc 30(4):915–958, 2017) and consider graphs as special case matrices, rely variant definition min-entropy given by Maples (Cokernels matrices satisf...

This research investigated the existing conditions and functionality of rows maple trees (Acer L.) (which are traditionally used in our country for urban greening) streets that most frequent terms traffic intensity, ways use measures to maintain greenery (streets I II order) on territory municipality Stari grad (Belgrade). In area a total 39 these categories were surveyed. Rows represented 2 ou...