NASA’s Mars Reconnaissance Orbiter has learned to pull off daring 120-degree rolls that give its SHARAD radar ...

Based on the parabolic approximation of Helmholtz equation, a three-dimensional (3-D) vector parabolic equation (PE) technique for predicting propagation loss in large region irregular terrain is ...

A ray-tracing method was employed to establish a concentration model for parabolic trough solar collectors based on finite element simulation. The analysis focused on the effects of non-ideal optical ...