We study the perspectives of measuring the phenomenon of vacuum birefringence predicted by quantum electrodynamics using an x-ray free-electron laser (XFEL) alone.We devise Cake an experimental scheme allowing two consecutive XFEL pulses to collide under a finite angle, and thus act as both pump and probe field for the effect.The signature of vacuu
Background Despite advances in the quality of Stationery acute stroke management, there are gaps in knowledge about effective support interventions to better manage the transition of care to home for patients with this complex condition.The goal of this systematic review is to explore the literature around support interventions available for patien
This article reviews briefly the background of actions to certify labor capacities, carried out by vocational training institutions in the Latin American and Caribbean region.It mentions Cake the current concept of certification and the different meanings usually ascribed to this term, associated with economic growth, competitiveness, and productiv