The initial case of atypical pneumonia occurred in Wuhan,Hubei Province at the end of 2019 caused by a novel coronavirus,soon it broke out all over the country beyond our imagination.For the very beginning of the brea...The initial case of atypical pneumonia occurred in Wuhan,Hubei Province at the end of 2019 caused by a novel coronavirus,soon it broke out all over the country beyond our imagination.For the very beginning of the break-out,we were lack of acknowledge of the newly disease,but with the further researches go,we intend to know the virus and disease better in every aspect.In this review we focus on the recent paper have been published online about epidemiology,clinical characteristics and therapy,which might help doctors to have a better understanding of the very disease.展开更多
The paper investigates the escape probability for isotropic emitters near a Kerr black hole.We propose a new approach to obtain the escape probability in a general manner,going beyond previous case-by-case studies.Thi...The paper investigates the escape probability for isotropic emitters near a Kerr black hole.We propose a new approach to obtain the escape probability in a general manner,going beyond previous case-by-case studies.This approach is based on studies of the black hole shadow with astrometric observable and can be applied to emitters with an arbitrary 4-velocities and locations,even to the emitters outside of the equatorial plane.We also consider representative examples illustrating how escape probabilities vary with distance,velocity,and inclination angle.Overall,this new approach provides an effective method for studying escape probabilities near Kerr black holes.展开更多
文摘The initial case of atypical pneumonia occurred in Wuhan,Hubei Province at the end of 2019 caused by a novel coronavirus,soon it broke out all over the country beyond our imagination.For the very beginning of the break-out,we were lack of acknowledge of the newly disease,but with the further researches go,we intend to know the virus and disease better in every aspect.In this review we focus on the recent paper have been published online about epidemiology,clinical characteristics and therapy,which might help doctors to have a better understanding of the very disease.
基金supported by the National Key Research and Development Program of China, Grant No. 2020YFC2201502by grants from the National Natural Science Foundation of China (Grant No. 11991052)the Key Research Program of Frontier Sciences, CAS, Grant No. ZDBS-LY-7009
文摘The paper investigates the escape probability for isotropic emitters near a Kerr black hole.We propose a new approach to obtain the escape probability in a general manner,going beyond previous case-by-case studies.This approach is based on studies of the black hole shadow with astrometric observable and can be applied to emitters with an arbitrary 4-velocities and locations,even to the emitters outside of the equatorial plane.We also consider representative examples illustrating how escape probabilities vary with distance,velocity,and inclination angle.Overall,this new approach provides an effective method for studying escape probabilities near Kerr black holes.
