In order to increase production efficiency at open-pit mines, on the basis of linear programming, a practical mathematical model for optimizing truck flow was d
We consider a population-size-dependent branching chain in a general random environment.We give sufficident conditions for certain extinction and for non-certai
A novel caged-prenylxanthone xanthone,neobractatin(1),was isolated from the twig of Garcinia bracteata.Its structure was elucidated by spectroscopic methods,esp
A simple and efficient method has been developed; benzil/benzoin undergoes smooth condensation with various substituted aldehyde and ammonium acetate in the pre
With the development of nanotechnology, the separation and manipulation of micro-nano-particles have become a research focus in the field of nano-materials. Die