Abstract: Visual recognition of abnormal fasteners is of vital practical significance for rails to maintain safe operation. However, affected by imaging conditions and other complex external factors, ...

Packing seems simple—until something important is missing. Many travelers only realize what they need after the trip has already started. Some items make things easier, others prevent small problems ...

For over two decades, global audiences watched Roger Federer strike forehands with a fluidity that often seemed effortless. That perception, however, masked the demanding and unglamorous reality of ...