Tables of Gemstone Identification

This proceedings highlights the applications of the newly introduced physical quantity Liutex in hydrodynamics and aerodynamics. Liutex is used to represent the fascinating rotational motion of fluids, i.e., the vortex. Ubiquitously seen in nature and engineering applications, the definition of vortices has been elusive. The Liutex vector provides a unique and systematic description of vortices. The proceedings collects papers presented in the invited workshop "Liutex and Third Generation of Vortex Identification for Engineering Applications" from Aerospace and Aeronautics World Forum 2021. The papers in this book cover both the theoretical aspects of Liutex and many applications in hydrodynamics and aerodynamics. The proceedings is a good reference for researchers in fluid mechanics who are interested in learning about the wide scope of applications of Liutex and using it to develop a new understanding of their research subjects.

Recent years have seen dramatic progress in shape recognition algorithms applied to ever-growing image databases. They have been applied to image stitching, stereo vision, image mosaics, solid object recognition and video or web image retrieval. More fundamentally, the ability of humans and animals to detect and recognize shapes is one of the enigmas of perception.

Drawing on their unrivaled field experience in Europe, the Middle East, and North Africa, authors Mark Beaman and Steve Madge have combined forces with some of Europe's finest bird artists to produce the region's most comprehensive guide ever. This is the first book to cover every species to have occurred in the region, including vagrants and accidentals–nearly nine hundred species in total. Color illustrations depict each bird and its main plumage stages and subspecies. An extensive text explains all aspects of identification, status, and habitat, while full-color maps within the text offer detailed distributional information.