In Russian historiography, for more than a century, there have been disputes about the possible reasons for the origin of East Slavic / Old Russian cities.Today, several hypotheses coexist: 1) cities are products of state power, 2) their emergence was influenced by the trade and craft factor, 3) the needs of defense influenced the formation of town
A novel actuator disk model (ADM) coupled with lifting-line theory is proposed in this paper.Several virtual planform blades are placed on a disk plane with a constant azimuthal interval, and the lifting-line theory is applied to each blade to predict the effective angle of attack.The proposed model considers the local lift and drag forces acting o
Infertility in cattle is a major concern of farmers worldwide and despite the enormous improvements in assisted reproduction technologies, the success rates of pregnancies are still low.Embryonic loss is considered one of the main factors of infertility in cattle.As such, the identification of genetic markers for embryo quality and development can