Phase wrapping is a major problem in direction-of-arrival (DOA) estimation using phase-difference observations. For sensor pair with an inter-sensor spacing greater than half of the wavelength ($\lambda/2$) signal, phase occurs at certain DOA angles leading to ambiguities. Existing unwrapping methods exploit either frequency or spatial diversity. These techniques work by imposing restrictions o...

A moving-mesh finite-difference solution of a Lotka-Volterra competition-diffusion model theoretical ecology is described in which the competition sufficiently strong to spatially segregate two populations, leading two-phase problem with coupling condition at moving interface. mesh approach preserves identities species space and time, so that parameters always refer correct population. The impl...