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We study wave propagation in periodic and frequency dependent materials. The approach in this paper leads to spectral analysis of a quadratic operator pencil where the spectral parameter relates to the quasimomentum and the frequency is a parameter. We show that the underlying operator has a discrete spectrum, where the eigenvalues are symmetrically placed(More)
BACKGROUND Outcome prediction scoring systems are increasingly used in intensive care medicine, but most were not developed for use in cardiac surgery patients. We compared the performance of four intensive care outcome prediction scoring systems (Acute Physiology and Chronic Health Evaluation II [APACHE II], Simplified Acute Physiology Score II [SAPS II],(More)
Ocean wave energy is a promising renewable energy source that can be converted into useful electrical energy using wave energy converters (WECs). In order for WECs to become a commercially viable alternative to established methods of energy generation, operating the WEC in an optimal fashion is a key task. Thus, model predictive control (MPC) is an(More)
STUDY DESIGN Report of a family affected with X-linked spondyloepiphyseal dysplasia tarda with special respect to radiologic alterations of the spine from puberty to the forth decade and to molecular analysis of the underlying genetic defect. OBJECTIVES To report the typical radiologic presentation of patients with X-linked spondyloepiphyseal dysplasia(More)
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