In the article, some Huygens inequalities involving trigonometric and hyperbolic functions are refined and sharpened. Mathematics subject classification (2010): Primary 26D05; Secondary 33B10.

A wide range of wireless system developments require knowledge of the distribution of electromagnetic fields from various sources in humans. As experimental assessment is ethically unacceptable, high resolution numerical dosimetry is needed. The FiniteDifference Time-Domain method is the most appropriate due to its simplicity and versatility. Reduction in demands on computational resources can ...

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T. M. H. Creemers,† C. A. De Caro,†,‡ R. W. Visschers,§ R. van Grondelle,| and S. Vo1lker*,†,| Center for the Study of Excited States of Molecules, Huygens and Gorlaeus Laboratories, UniVersity of Leiden, 2300 RA Leiden, The Netherlands, Department of Biomolecular Structure and Dynamics, Faculty of Biology, Free UniVersity, 1081 HV Amsterdam, The Netherlands, and Department of Biophysics, Facul...

Metasurfaces are a family of novel wavefront-shaping devices with planar profile and subwavelength thickness. Acoustic metasurfaces with ultralow profile yet extraordinary wave manipulating properties would be highly desirable for improving the performance of many acoustic wave-based applications. However, designing acoustic metasurfaces with similar functionality to their electromagnetic count...