This paper presents a computer-based method for modelling the blades of horizontal axis turbines using B-spline surfaces. The method uses common design parameters for the geometry of this type of turbine and produces a final set of B-spline surfaces for the geometry of the blades that can be...

When the selected parametric model for the covariance structure is far from the true one, the corresponding covariance estimator could have considerable bias. To balance the variability and bias of the covariance estimator, we employ a nonparametric method. In addition, as different mean...

In den hier versammelten Aufsätzen werden verschiedene statistische Verfahren zur Analyse diskreter Strukturen auf Fragen der Arbeitsmarkt- und Entwicklungsökonomie angewandt. In Teil I wird untersucht, ob Arbeitslosigkeit einen Einfluss auf das Auszugsverhalten junger Menschen in der...

In general, for a sufficiently regular function, an expression for the quasi-interpolation error associated with discrete, differential and integral quasi-interpolants can be derived involving a term measuring how well the non-reproduced monomials are approximated. That term depends on some...

Given a B-spline M on Rs, s≥1 we consider a classical discrete quasi-interpolant Qd written in the formQdf=∑i∈Zsf(i)L(⋅−i),where L(x)≔∑j∈JcjM(x−j) for some finite subset J⊂Zs and cj∈R. This fundamental function is determined to produce a quasi-interpolation operator exact...