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Diameter-dependent growth rate of InAs nanowires

We have grown Au seeded InAs nanowires using chemical beam epitaxy and report on the growth rate dependence on nanowire diameter. We find a maximum of the growth rate at a nanowire diameter of 25 nm, below which the growth rate decreases due to the Gibbs-Thomson effect. Above the maximum, the growth rate decreases with increasing diameter due to the effect of material diffusion to the growth point

Patch antennas on inhomogeneous substrates

Patch antennas on inhomogeneous substrates are analyzed with the stable FEM-FDTD hybrid method [T. Rylander and A. Bondeson, “Stable FEMFDTD hybrid method for Maxwell’s equations,” Comput. Phys. Comm. 125, 75 (2000)] and an analytic propagator technique. For inhomogeneous substrates with a fixed homogenized value of the permittivity, our results conjecture that a decrease of the permittivity in the

Parameter Optimization of a Paper Machine Model

In this paper, the problem of calibrating a paper machine dryer section model to measurement data is treated. The model, which is dynamic, nonlinear and of large scale, is implemented in Modelica and Dymola. The purpose of the model is to evaluate, in simulation, new control structures before application to the plant. This approach requires a well calibrated model in order for simulation results t