Flight is one of the energetically most costly activities in the animal kingdom, suggesting that natural selection should work to optimize flight performance.The similar size and flight speed of birds and bats may therefore suggest convergent aerodynamic performance; alternatively, flight performance could be restricted by phylogenetic constraints.
Abstract How do people form personal ties? A consensus holds in sociological and social network scholarship that in-person networks are dominated by status homophily and that guanxi networks rely extensively on balance.This article argues that social networking sites (SNSs) reconceptualize the character of homophily and tie-formation altogether in
By revisiting the Nabara 2 shelter in the southern Ennedi (Chad), some previously unreported paintings and a 2 Pce Home Office Package whole set of unexpected oval engravings were surveyed.These engravings, internally decorated with patterns of lines, some featured by a single longitudinal element or a sort of reticular structure, make Nabara 2 an
Steel making industries exhibit extreme working conditions characterized by high temperature, pressure, and production speed as well as intense throughput.Due to high economic and energy investments of the overall production process, an Pulley intense and expensive preventive maintenance program is adopted to avoid breakdowns.Steel making process w