A modified dual-band microstrip patch antenna with a U-slot and loaded with double shorted posts;

However,a sharp crack can hardly be prepared for the specimen of quasi-brittle materials,alternatively it is reasonable to consider a U-shaped notch,then use stress concentration factor(SCF) to characterize the peak stress at the notch bottom.

Arbitrary Lagrangian-Eulerian method is used to study large sloshing of water in large scale U-shaped aqueduct, and to discuss the vibration responses of aqueduct structure with different water levels under sinusoidal loads and earthquake action.