Photonic Doppler velocimetry (PDV) has rapidly become a standard diagnostic for measuring velocities in dynamic compression research. While free surface velocity measurements are fairly straightforward, complications occur when PDV is used to measure a dynamically loaded sample through a window. Fresnel reflections can severely affect the velocity and time resolution of PDV measurements, especi...

With an increasing trend towards deep water production, the susceptibility of offshore structures to dynamic response has become an important issue. Indeed, this has been bough to the forefront by a new response phenomenon, commonly referred to as ‘ringing’, which is thought to be associated with steep near-braking waves. At present, neither the occurrence of ‘ringing’ or the mechanisms which p...

reached so far to the south-east of Africa as Natal, seems to me extraordinary”, wrote Witherby. The primary purpose of bird ringing was to map bird migration, and much information about migration routes and winter and summer destinations has been obtained over the past century. Ringing is still based on the original principles but techniques have been refined and improved. And researchers have...

At low bit rates, image compression codecs based on overlapping transforms introduce spurious oscillations known as ringing artifacts in the vicinity of major edges. Unlike previous works, we present a maximum-likelihood approach to the ringingartifact removal problem. Our approach employs a parameter-estimation method based on the -means algorithm with the number of clusters determined by a cl...