The rail-wheel interface is fundamental to explain the dynamic running behaviour of a railway vehicle.It must therefore be understood and among the parameters by which it is characterised, the one called "equivalent conicity" plays an essential role since it allows the satisfactory appreciation of the wheel-rail contact on tangent track and on larg

BackgroundTo investigate the mortality and health care resource use among patients with severe or critical coronavirus disease of 2019 (COVID-19) in the first wave of pandemic in China.MethodsWe performed a systematic review and meta-analysis to investigate the mortality, discharge rate, length of hospital stay, and use of invasive ventilation in s

Abstract Background Completed genomes and environmental genomic sequences are bringing a significant contribution to understanding the evolution of gene families, microbial metabolism and community eco-physiology.Here, we used comparative genomics and phylogenetic analyses in conjunction with enzymatic data to probe the evolution and functions of a

Wheat is one of the important food Right Seat Adjustment Lever crops in the world, and the stability and growth of wheat production have a decisive impact on global food security and economic prosperity.Wheat counting is of great significance for agricultural management, yield prediction and resource allocation.Research shows that the wheat ear cou