Forest gradients in West Africa : a spatial gradient analysis / Renaat S.A.R. van RompaeyMarangoni convection : numerical model and experiments / Antonius Waltherus Jacobus Petrus den BoerExploring the calcicole-calcifuge gradient in heathlands / Maria Cornelia Catharina de GraafOn the phase behavior of polydisperse copolymers : (tapering, oscillations and destruction) / Christiaan KokOn the phase behavior of polydisperse copolymers : (tapering, oscillations and destruction) / Christiaan KokGradient plasticity with interfacial effects and experimental confirmation through nano-indentation / Katerina Elias AifantisBifurcations of gradient vector fields / Geert Vegter