Bees have a diversified natural history, thus the methods applied to study such diversity are varied.When it comes to studies of nesting biology, bees which nest in pre-existing cavities have been reasonably well studied since researchers started using trap-nests.However, bees whose nests are built underground are poorly studied due to the difficul
Mainly myle mini price addressed in this paper is the stability problem of continuous-time switched cascade nonlinear systems with time-varying delays.A robust convergence property is proved first: If a nominal switched nonlinear system with delays is asymptotically stable, then trajectories of corresponding perturbed system asymptotically approach
what is faux shagreen made of Abstract Every austral spring when Antarctic sea ice melts, favorable growing conditions lead to an intense phytoplankton bloom, which supports much of the local marine ecosystem.Recent studies have found that Antarctic sea ice is predictable several years in advance, suggesting that the spring bloom might exhibit simi