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A new method based on the mode matching technique and the finite element method (FEM) is presented. The method can handle a general thick frequency selective structure (FSS), that consists of an arbitraryn umber of aperture layers and dielectric layers. An aperture layer consists of a conducting plate with a periodic arrayof apertures. The order and the thickness of the layers can be arbitrary. The
Fuel cells are electrochemical devices that directly transform chemical energy into electricity, which are promising for future energy systems, because they are energy efficient. The cell performance depends strongly on the material characteristics, the operating conditions and the chemical reactions that occur at active sites. The steam reforming and electrochemical reaction rates depend on tempe
I denna artikel tar vi upp olika problem, frågor, kring nätbaserad utbildning som kan vara motiv för en fortfarande smal läraranvändargrupp. Vi diskuterar vår lösning till dessa problem.
Artikeln är en slutreplik på debattartikeln "Skattepengar ska inte gå till studiecoacher"
The dielectric continuum model has rightfully been and continues to be a major workhorse for theory and modelling in Surface and Colloid Chemistry. Due to the implicit description of water, entering only as a scaling constant for charge-charge interactions, one would not expect it to work for short distances. However, considerable evidence has been accumulated over the years which shows that t
