This thesis concerns the role of sediment-living macrobenthos in the cycling of nitrogen species and nitrogen transformation in eutrophic freshwater sediments. In my thesis I have, employing 15N-isotope techniques in laboratory experiments, shown the importance of infaunal chironomid larvae and oligochaetes on denitrification in eutrophic lake sediments. Investigated benthic organisms not only ex

Tolerances are an important part of production where the desire to produce quality products have to be weighed against the increased production costs. The desired tolerance will influence the choice of both production method as well as the machine used. Given that machining is an adequate production method, variation of the required surface roughness will imply a variation of the part cost which n

While the purpuse of the study is to understand drug abuse through experiences told by individuals in life history interviews, the analyses moves beyond the level of descriptive life history. The interview material is interpreted within a theoretical framework, where the multidimensional character of drug abuse is considered. Three perspectives are applied in the analyses: (1) Practise: Different

Almost all automatic semantic role labeling (SRL) systems rely on a preliminary parsing step that derives a syntactic structure from the sentence being analyzed. This makes the choice of syntactic representation an essential design decision. In this paper, we study the influence of syntactic representation on the performance of SRL systems. Specifically, we compare constituent-based and dependency

Popular Abstract in Swedish Olika livsmiljöer och livsstilar kan ställa mycket olika krav på ett sinnesorgans uppbyggnad och funktion. Man kan därför förvänta sig att tex. ögonen hos ett lejon skiljer sig väsentligt från musslors, maskars eller djuphavsfiskars ögon. Det har också visat sig att om man undersöker ett öga i detalj så är det oftast mycket väl anpassat till just de förutsättningar som Functional aspects of the large diversity of eye design in prosobranch molluscs was investigated using morphological and optical methods. Three species from different habitats were investigated. Littorina littorea from Scandinavian intertidal rock habitats, Strombus raninus and S. gigas from tropical sand-flats and Ampularia sp. from heavily vegetated habitats in tropical fresh-water. Littorina a

Popular Abstract in Swedish Amylos-lipid-komplex är ett fenomen som förekommer i vardagliga livsmedel som innehåller stärkelse, t ex bröd och pasta. Dess struktur på molekylnivå kan liknas vid en "fransk hot dog"; franskbrödet motsvarar stärkelsemolekylen "amylos", som bildar en spiral. I dess tunnel stoppas en fet korv, vilken motsvarar en molekyl som har en lång, fet "svans". Molekylerna sitter This thesis is about the formation of amylose-lipid complexes, and their properties. Two forms of superstructures can be identified. Complex form I has more randomly distributed helices, while the structure of form II is crystalline and therefore exhibits the typical V-pattern in X-ray diffraction analyses. Form II has higher heat stability, and is produced by heating at a temperature at least suf

The extensive analysis of Nb II by Ryabtsev et al. (2000) has made it possible for us to measure branching fractions (BFs) in Nb II. The BFs have been measured from spectral line intensities, recorded with the Lund UV Fourier transform spectrometer in the wavelength region 2500 to 5000

A computational algorithm for the full information H∞ control problem for multi-delayed LTI systems is derived. The algorithm is based on a general operator approach in the spectral domain developed for finite-dimensional LTI plants. The simplicity of spectral operations and explicit formulas for computation make it possible to generalize it to infinite-dimensional plants. In the paper, a complete

Artikel om svensk-ryska kriget 1808-09 samt betydelsen av Johan Ludvig Runebergs Fänriks Ståls sägner i 1800- och 1900-talets Sverige.

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