Carbon fibre composite laminates are increasingly being used for aerospace structures due to their low weight and improved mechanical performance. Impact damage can cause delaminations below the visible surface of structure limited interlaminar strength. Guided ultrasonic waves detect characterize in laminates. The scattering A0 Lamb wave mode at an artificial delamination, located asymmetric d...

The possibility that long gamma-ray burst (GRB) jets are structured receives growing attention recently, and we have suggested that most GRBs and their softer, less energetic fraternity, X-ray flashes (XRFs), can be understood within a quasi-universal structured jet picture, given that the jet structure for each individual burst is a Gaussian or similar function. Here we perform a global test o...

The possibility that long gamma-ray burst (GRB) jets are structured receives growing attention recently, and we have suggested that most GRBs and their softer, less energetic fraternity, X-ray flashes (XRFs), can be understood within a quasi-universal structured jet picture, given that the jet structure of each individual burst is a Gaussian or similar function. Here we perform a global test on...

A Luneburg lens is a gradient refractive index that can focus plane waves on point at the perimeter without aberration. Three-dimensional (3D) for airborne sound has been well investigated in recent years. However, constructing 3D underwater challenging task due to difficulties designing and fabricating of desired isotropic acoustic materials. This work presents practical implementation sound. ...