We present the results of a new estimation of the photodisintegration and propagation of ultrahigh energy cosmic-ray (UHCR) nuclei in intergalactic space. The critical interactions for energy loss and photodisintegration of UHCR nuclei occur with photons of the infrared background radiation (IBR). We have reexamined this problem making use of a new determination of the IBR based on empirical da...

Due to the explosive increase per capita in vehicle ownership China brought about by continuous development of economy and society, many negative impacts have arisen, making it necessary establish smart city system that has rapidly developing detection technology as its data acquisition system. This paper proposes a lightweight model based on an improved version YOLOv5 address problem missed fa...