Comparison of geometric microliths of the Northern Caspian and Lower Don

Geometric microliths are inherent in almost all the Mesolithic and Neolithic monuments in the Lower Volga Region. For the sites of the territory they play a key role. With the help of this type of tools, it is possible to determine the cultural affiliation and chronological position of the studied monuments. In this paper we mainly consider the Neolithic sites on the territory of the Lower Volga and Lower Donets, which have geometric microliths in stone implements. Most of these monuments have a fairly stable series of tools of a geometric type, which makes it possible to compare them among themselves and draw parallels. The results of radiocarbon dating for Neolithic monuments of the Lower Volga and Lower Donets are presented. There is a typological comparison of these sites. The paper discusses similarities and differences, as well as possible contacts, or the lack of population on the two territories - the Lower Volga and the Lower Donets. The author comes to the conclusion that based on the analysis of geometric microliths it is not possible to trace a significant connection between the population of the Lower Volga and the Lower Donets. In the development of the flint industries of these regions there are more differences than similarities.

Harnessing Lewis acidic open metal sites of metal–organic frameworks: the foremost route to achieve highly selective benzene sorption over cyclohexane

Based on the tactical utilization of the Lewis acidic open metal sites (OMS) functionality; for an OMS-rich, microporous, water-stable series of metal–organic frameworks (M-MOF-74), vapor sorption based efficient selectivity for benzene over cyclohexane has been realized, crucial from industrial separation frontier.