Thomas Willemsen

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As women have become more assimilated into the work-force over recent decades, they have realized considerable changes in their work roles which may contribute to health problems and other negative outcomes such as marital strain and diminished job status. The purpose of this review was threefold: (1) to synthesize data on the distribution of women's work(More)
Global Navigation Satellite Systems (GNSS)-based navigation with smartphones is very popular. But in areas where no GNSS signal is found navigation could be useful. Examples are navigation in shopping malls, in big offices, in train stations or museums. The goal is to estimate the position in GNSS shaded areas to make navigation possible. The MEMS sensors(More)
SUMMARY Caused by the rapid technical development in the recent 30 years the question relating to position specification and navigation of pedestrians in the outside location could nearly be solved. GNSS-systems are working on almost all transportable devices, e.g. smartphones or tablets – consequently they can be used at any time, at any location. But this(More)
A fast Fourier-based measurement system to determine phase, group delay, and group delay dispersion during optical coating processes is proposed. The in situ method is based on a Michelson interferometer with a broad band light source and a very fast spectrometer. To our knowledge, group delay dispersion measurements directly on the moving substrates during(More)
Plasma deposition techniques like ion-beam-sputtering (IBS) are state of the art to manufacture high quality optical components for laser applications. Besides the well optimized process and monitoring systems, the coating material selection is integral to achieve optimum optical performances. Applying the IBS technology, an approach is presented to create(More)
We report on few-cycle pulse characterization based on third harmonic generation dispersion scan (THG d-scan) measurements using thin films of different TiO(2)-SiO(2) compositions as nonlinear media. By changing the TiO(2) concentration in the thin film the band gap and therefore the position of the absorption edge were varied. The retrieved pulse durations(More)