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In order to simplify computational methods based on dynamic programming, an approximative procedure based on upper and lower bounds of the optimal cost was recently introduced. The convergence properties of this procedure are analyzed in this paper. In particular, it is shown that the computational effort in finding an approximately optimal control law by relaxed value iteration is related to the

Urinary tract infections (UTI) are common, dangerous and interesting. This review includes a general background on UTIs and molecular mechanisms of pathogenesis. In addition, we discuss UTI susceptibility and especially the effect of genetic variation on innate immunity. The symptoms of acute pyelonephritis are caused by the innate immune response and inflammation in the urinary tract decreases re

When performing adaptive optics (AO) correction for the effect of atmospheric fluctuations, different effects, related to measuring the wavefront at one wavelength and observing at another one, may show up. Some of these effects are related to the dispersive properties of the atmosphere. Others are related to diffraction, both regarding light propagation through the turbulent atmosphere to the ent

The evaporative gas turbine (EvGT), also known as the humid air turbine (HAT) cycle, is a novel advanced gas turbine cycle that has attracted considerable interest for the last decade. This high-efficiency cycle shows the potential to be competitive with Diesel engines or combined cycles in small and intermediate scale plants for power production and/or cogeneration. A 0.6 MW natural gas-fired EvG

Under många år har konsumenttidningen Råd & Rön haft stort inflytande på de svenska konsumenterna och deras konsumtion. Under närmare 50 år ägdes tidningen av Konsumentverket och dess föregångare Statens institut för konsumentfrågor. Genom studier av Råd & Röns årgångar, konsumentmyndigheternas arkiv samt riksdagstrycket står det tydligt att politiker och konsumentmyndigheter haft stort in

Our aim was to analyze retinal structure in young patients with Best disease with reference to future gene therapy. This was a retrospective observational spectral domain optical coherence tomography study of four patients aged 10 years or less with Best disease. Findings ranged from subtle thickening at the level of the retinal pigment epithelium-photoreceptor interdigitation line, to subretinal

To evaluate polyalkylimide as a possible vitreous tamponading agent. A 20-gauge pars plana vitrectomy and posterior vitreous detachment were performed in the right eye of six pigmented rabbits. Approximately 1 ml of viscoelastic gel, polyalkylimide (Bio-AlcamidA (R)) was thereafter injected into the vitreous space. Full-field ERG and intraocular pressure (IOP, Tonopen) was measured pre-and postope