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The lightning swept stroke along an aircraft in flight. Part II: numerical simulations of the complete process

During a lightning strike to an aircraft in flight, the lightning channel gets deformed in the airflow and displaced along the aircraft, a so-called swept stroke . The deformation and the displacement are caused by the interaction between the aerodynamic flow and the plasma properties of the channel together with the properties of the surface. We give a theoretical analysis and a numerical modelli

Higher order hierarchical H(curl) Legendre basis functions applied in the finite element method: emphasis on microwave circuits

In this paper a set of higher order hierarchical H(curl) Legendre basis functions is introduced as a basis in the two and three dimensional finite element method (FEM). The basis functions are divided into three different sets: edge functions, surface functions and interior functions. Two problems are addressed in order to study the $p$-convergence of the representation. In the first problem the e

Algorithmic Improvements for Stochastic Rasterization & Depth Buffering

Popular Abstract in Swedish Inom området datorgrafik undersöker man hur virtuella scener kan omvandlas till verklighetstrogna bilder. För interaktiva miljöer, som exempelvis datorspel, måste en ny bild vara genererad och klar att visas på skärmen mellan 30-60 gånger i sekunden för att upplevelsen ska kännas responsiv och för att rörelser ska flyta på ett naturligt sätt. För att datorn ska hinna meThe field of computer graphics refers to the use of computers to generate realistic-looking images from virtual scenes. Graphics processing units use an algorithm known as rasterization to compute images of scenes viewed from a virtual camera. The commonly used pinhole camera model does not account for the imperfections that stem from the physical limitations in real-world cameras. This includes,

The use of assistive technology in different age-groups of old people

The aim of this study is to explore the use and perceived unfilled need for assistive technology (AT) for everyday life in three age-groups during the ageing process. Data on use and perceived unfilled need for AT from three age-groups were used; the very old age-group; 81-90, n=314, the oldest old age-group; 85-94, n=154 and younger agegroup, 67-71. The results show that the proportion of users h

An Analytical Procedure for Determining Chromium in Samples of Airborne Dust

Abstract in UndeterminedA method is described for assessing occupational exposures to chromium aerosols; it involves four procedures. The first, proton induced X-ray emission (PIXE), measures the total chromium,. The second, electron spectroscopy for chemical analysis (ESCA), measures the oxidation state of the particle surfaces, and the third, which uses sym-diphenylcarbazide (DPC), measures the