Recognizing, assessing, and responding to threats is critical for survival in the wild.Birds, especially in their role as parents, must decide whether to flee or delay flight when threatened.This study examines how age, reproductive stage, and the presence of a mate influence flight initiation distance (FID) and nest recess duration in white storks
This article contains a kinematic analysis of an aircraft chassis mechanism in a range of positions.The mechanism of the chassis is made up of several smaller subsystems with different functions.The first mechanism is used to eject the chassis before landing (touchdown) and fold it to hatchway after the lift off.The second mechanism is designed to
This paper studies the exponential stability of switched positive nonlinear systems defined by cooperative and homogeneous vector fields.In order to capture the decay rate of such systems, we first consider the subsystems.A sufficient condition for exponential stability of subsystems with time-varying delays Vitamins is derived.In particular, for t
The Antarctica Dry Valleys are regarded as the coldest hyperarid desert system on Earth.While a wide variety of environmental stressors including very low minimum temperatures, frequent freeze-thaw cycles and low water availability impose severe limitations to life, suitable niches for abundant microbial colonization exist.Antarctic desert soils co
Abstract Oviraptorosaurians were a theropod dinosaur group that reached high diversity in the Late Cretaceous.Within oviraptorosaurians, the later diverging oviraptorids evolved distinctive crania which were extensively pneumatised, short and tall, and had a robust toothless beak, interpreted as providing a powerful bite for their herbivorous to om