The tail-sitter Vertical Takeoff and Landing (VTOL) Unmanned Aerial Vehicle(UAV), flying in a fixed-wing model, overcomes many shortcomings of traditional fixed-wing UAVs, and inherits the advantage Lids of high overall efficiency, which means it has great development potential and very broad application prospects.The attitude of tail-sitter VTOL U
COVID-19 has wreaked havoc globally with particular concerns for sub-Saharan Africa (SSA), where models suggest that the majority of the population will become infected.Conventional wisdom suggests that the continent will bear a higher burden of COVID-19 for the same reasons it suffers from other infectious diseases: ecology, socio-economic conditi
Abstract Hydrogels have shown great potential and value in wound healing.In this study, we construct a mesenchymal stem cell exosomes (MSC-Exos) laden natural biopolymer-based hydrogel with transparent, self-healing, injectable, and tissue adhesive properties to promote corneal regeneration.This hydrogel is synthesized by combining aldehyde-modifie
Coffee represents an interesting foodstuff for secondary shelf life modelling, since it is know that almost immediately after its exposure to environmental influences, aroma and colour degradation reactions occur.These reactions can be prevented or retarded by a packaging material, adapted to the given type of food.The aim of this paper was to esti