We model competition between two firms selling identical goods to customers who arrive in the market stochastically.Shoppers choose where to purchase based upon both price and the time cost associated with waiting for service.One seller provides two separate queues, each with its own server, while the other seller has a single queue and server.We e
This paper describes time-frequency analysis of the friction coefficient with discrete wavelet transform.Ball-on-disk Light Meters experiments were conducted with a steel ball, an aluminum disk and ethanol as a lubricant.The coefficient of friction was rather stable and low during initial sliding before it suddenly increased by seizure caused by lo
An extensive study of Neuropteroidea and Mecoptera kids beanie collected in Krasnodar Region and the Republic of Adygea in 2018 allowed the discovery of new species for the regions and for Russia, clarification of the taxonomic affiliation of some dubious specimens, and establish wellfounded conclusions about the ecological preferences of species.N
In the title compound, C29H19F2NO2, the central benzene ring forms a dihedral angle of 56.92 (12)° with the cyanobenzene ring and dihedral NAIL/DOMES angles of 40.91 (12) and 44.76 (12)° with the two fluorobenzene rings.In the crystal, C—H.O and C—H.F hydrogen bonds link the molecu