Abstract Recent applications of digital photogrammetry in forestry have highlighted its utility as a viable mensuration technique. However, tropical regions little research has been done on the accuracy this approach for stem volume calculation. In study, performance Structure from Motion estimating individual tree relation to traditional approaches was evaluated. We selected 30 trees five sava...

Since radio telescope is the main tool for human being to search the universe secret, the astronomer reached unanimity at the 24th URSI Conference in Kyota, Japan, 1993, and proposed to construct the next generation of the large radio telescope (LT) (Nan & Peng, 2000). From then on, the astronomer of China began the project of Five-hundred meter Aperture Spherical radio Telescope (FAST) (Qiu, 1...

Abstract We consider a surface with negative curvature in $${{\mathbb {R}}}^3,$$ R 3 , which is cubic perturbation of the saddle. For this surface, we prove new restriction theorem, analogous to theorem for paraboloids proved by L...