The global spread of COVID-19 has led to profound reflection on building a global public door stop health security system.This paper uses the urban data collected during the COVID-19 epidemic in China in 2020 to evaluate the effect of the National Sanitary City (NSC) policy on the prevention and control of that epidemic at different stages.We found
In this paper, we use the su(1,1)-algebraic treatment to explore the effects of the intrinsic decoherence in a two-mode cavity containing a two-level atom.Each field is resonant with the qubit through a four-photon process.The role of the intrinsic decoherence and Pod Vapes the superposition of the initial generalized Barut-Girardello coherent stat
As a new type of marine unmanned intelligent equipment, autonomous underwater vehicle (AUV) has been widely used in the VCR Accessories field of ocean observation, maritime rescue, mine countermeasures, intelligence reconnaissance, etc.Especially in the underwater search mission, the technical advantages of AUV are particularly obvious.However, lim