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Modes of propagation of electromagnetic pulses in open dispersive slab waveguides

As a preparatory study of electromagnetic pulse propagation in open waveguides, the modes of propagation of pulses in open slab waveguides are investigated systematically. Core and cladding both consist of simple (linear, homogeneous, isotropic), dispersive materials modeled by temporal convolution with physically sound susceptibility kernels. Under these circumstances, pulses cannot propagate alo

The diversity of mind wandering : The role of individual differences and cognitive factors

Popular Abstract in SwedishMänniskor spenderar en stor del av sin vakna tid åt att tänka på saker som är orelaterade till den uppgift de håller på med eller den omgivning de befinner sig i (dagdrömmar). Under tiden man jobbar, läser en tidning, eller väntar på bussen kan manexempelvis börja tänka på något trevligt man ska göra nästa helg eller en tidigare deprimerande händelse som upprör en. DagdrMany individuals spend a substantial portion of their waking time thinking about topics unrelated to current activities and surroundings (mind wandering). This dissertation sought to contribute to our knowledge of why some people mind wander more than others. Mind wandering in cognitive tasks is more common in individuals with poor executive cognitive control (working memory updating, inhibiting t

Screening of a proton in an electron gas

Calculations are reported of the nonlinear screening of a proton in an electron gas of densities corresponding to rs=1-6. Results for charge densities and total energies are presented from self-consistent Kohn-Sham ground-state calculations. The results differ markedly from the case of linear screening, particularly at low densities. The occurrence of a bound state around the proton for rs>1.9 ind