The study of time-periodic solutions the multidimensional wave equation on entire 3D space is an important field research in applied mathematics. It known that this leads to Sommerfeld radiation condition at infinity. states for a solution one-dimensional equation, such as Helmholtz or represent outgoing 1D, which models propagation electromagnetic waves systems effectively reduced one dimensio...

This article describes algorithms to extract tree crowns using two-dimensional (2D) and three-dimensional (3D) segmentation. As a first step, 2D-search detected the tallest trees but was unable detect located below other trees. However, 3D-search for local maxima of model fits could be used in second step also lower canopy layers. We compared detection results from ALS carried out at 1450 m abo...