Popular Abstract in Swedish Isocyanater är en grupp kemiska ämnen som framförallt används vid tillverkning av polyuretan (PUR). PUR förekommer i många olika varianter och är ett av de vanligaste plastmaterialen i våra hem. PUR finns som ”skumgummi” i madrasser, möbler och i bilar, men även i en mängd andra produkter som t.ex. färg, lack och lim. Det finns en risk för isocyanatexponering vid framsIsocyanates are used in the production of polyurethane (PUR). Exposure to isocyanates is associated with respiratory disorders and may occur during production or processing of PUR. During thermal degradation of PUR, amines and aminoisocyanates are formed in addition to isocyanates. Some isocyanates and several aromatic amines are sensitizers and listed as carcinogens. A liquid chromatography mass

Popular Abstract in Swedish Mätning av blodflöde är en vanlig uppgift för ett kliniskt fysiologiskt laboratorium. Sådana undersökningar syftar inte bara till att diagnostisera sjukdomstillstånd utan kan också användas för att följa effekter av kirurgiska och medicinska behandlingar. En del metoder används rutinmässigt t ex ultraljudstekniken. Metoderna utvecklas dock ständigt och helt nya metoder Laser Doppler flowmetry (LDF) and laser Doppler imaging (LDI) are modern methods for non-invasive and continuous assessment of skin blood flow. The techniques are based on the phenomenon that monochromatic light transilluminating a perfused tissue is spectrally broadened owing to scattering by moving blood cells. In this study, methodological aspects of the two methods are presented. LDF was used

External cavity diode lasers are often tuned by letting a piezoelectric actuator move the grating, thereby changing the length of the cavity. In order to reach higher repeatability and tuning speeds one can incorporate an electro-optical crystal (EOC) into the cavity. The index of refraction of the EOC can be changed by applying an electric field across it, thereby accurately changing the effectiv

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Navigation using inertial measurement units (IMUs) is an interesting area of research. Due to the low cost hardware and simple implementation, the approach looks very attractive. But the performance of the IMUs to provide sub-meter accuracy over a longer period of time is still not sufficient, so different approaches have been adopted to increase the performance at the cost of extra hardware and/o

The magnetization of a ferro- or ferri-magnetic material has been modeled with the Landau-Lifshitz-Gilbert (LLG) equation. In this model demagnetization effects are included. By applying a linearized small signal model of the LLG equation, it was found that the material can be described by an effective permeability and with the aid of a static external biasing field, the material can be switched b

Abundances for the elements W, Os, and Bi are presented for the HgMn star chi Lupi, based upon GHRS echelle-mode spectra and a synthetic spectrum analysis. The tungsten abundance is consistent with a solar-system value while the osmium and bismuth abundances reflect enhancements. With these new data we are able to quantitatively define an abundance peak within the element range Z = 74 through 83.

Many animals use vision to guide their behaviour and to collect relevant information about their environment. The diversity of visual environments and of visually guided tasks has led to a large variety of specialisations of eyes and visual systems. Our knowledge, however, about how the anatomical and physiological properties of eyes and the behavioural strategies of animals relate to the visual s

Popular Abstract in SwedishDenna doktorsavhandling har studerat förskolebarns kamratkompetens och speciellt uppmärksammat tre aspekter som är av central betydelse för barns samspel med kamrater; prosocialt beteende, aggressivt beteende och social kognition. Prosocialt beteende är handlingar som på något sätt gynnar en annan person (t ex hjälpa, trösta och dela med sig). Trots att prosocialt beteenThis doctoral thesis explored three broad aspects of preschoolers’ social competence: prosocial behavior, aggression, and social cognition. The longitudinal study followed forty-four children (initially 22-40 months), who were observed in natural peer interactions at their daycare centers during a two-month period in each of three con-secutive years. In addition, social-cognitive data were gathere