British police on Tuesday said they had arrested three senior staff at the hospital where nurse Lucy Letby was found to have murdered seven babies, on suspicion of gross negligence manslaughter.

By Francesca Street, CNN (CNN) — Catherine Tondelli was standing underneath the Trevi Fountain, on a summer’s evening in Rome, about to throw three coins into the fountain’s waters.

This article proposes a sliding-mode-observer (SMO)-based control strategy to regulate the dc-link voltage for a three-phase two-level active front end (AFE). The SMO is designed for the voltage ...