Hobbing is a common manufacturing method when producing helical, involute gears. In order to give the manufactured gear a controlled surface smoothness, a method to, very accurately, determine the achieved surface geometry is needed. In this report, the cutting surfaces of the tool, of which the cutting edges are the boundaries, are assumed to be plane in arbitrary directions. They are mathematica

Peripheral tolerance is regulated by different types of regulatory T cells, including CD1-restricted T cells and CD4+CD25+ regulatory T (Treg) cells. This thesis has focused on the interactions between T cells and antigen presenting cells (APCs) and the immunregulatory function of TGF-b as two important factors regulating differentiation and activation of T cells in the periphery. In the first par

Popular Abstract in Swedish Skogskalkning ledde till ökat artantal, ökat antal individer av enskilda arter och ökad omsättning av arter i fältskiktet i bokskog. För gulplister var individstorleken och sexuell respektive vegetativ förökning opåverkad av kalkningen. Sexuell och vegetativ förökning ökade med ökad individstorlek hos gulplister, både i en population av omanipulerade individer som växteLiming increased species richness, in accordance with the species pool hypothesis, and number of plants of individual species in beech forest field-layer vegetation, by increasing establishment by seedlings and vegetative offspring. Turnover rates also increased, suggesting the explanatory value of the carousel model. Plant size, absolute measures of reproduction, and poportional measures of sexua

Popular Abstract in Swedish Denna avhandling grundar sig på forskning inom fältet ``högenergetisk tungjonsfysik'', där man studerar materia under extrema förhållanden vad gäller temperatur och densitet. Experimenten utförs på stora anläggningar där atomkärnor accelereras till höga hastigheter innan de kollideras med varandra. Höga krav ställs på de partikeldetektorer som byggs upp kring sådana intPHENIX is one of four experiments at the Relativistic Heavy-Ion Collider, RHIC. The high-energy heavy-ion collisions provided by this accelerator offer the possibility to study nuclear matter at high temperature and density. The high multiplicity of particles produced in these collisions puts high demands on detector performance. Providing space points along particle trajectories, the Pad Chamber

If we admit that, with the exception of language, human perception is predominantly visual, it is reasonable to think that all phenomena conveyed by the visual senses have something in common, but then visual semiotics/visual culture will comprehend much more than painting, sculpture, and architecture. The double coding hypotheses of cognitive psychology, as well as Lessing’s classical opposition

Image processing is one of the popular applications of Cellular Neural Networks. Macro enriched field-programmable gate-arrays can be used to realize such systems on silicon. The paper discusses a pipelined implementation that supports the handling of gray-level images at 180 to 240 Mpixels per second by exploiting the Virtex-II macros to spatially unroll the local feedback

Popular Abstract in Swedish Klumpfot är en medfödd missbildning av foten med karaktäristiska felställningar av fram- och bakfot, där såväl skelett som mjukdelar är engagerade. Foten är både vriden och roterad inåt med felställningar av bl.a. hälbenet, språngbenet och båtbenet, i varierande svårighetsgrad. Med en förekomst på cirka 1-2 av 1000 levande födda (i Europa) är klumpfot en av de vanligastThe purpose of the study was to develop an ultrasound (US) protocol for evaluating congenital clubfoot pathoanatomy before and during early treatment. By using 3 easily defined and reproducible US projections the talonavicular and the calcaneocuboid joints were assessed. Normal configurations of the relationships at these joints were obtained by investigating 54 healthy babies at the ages of 0, 4

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Popular Abstract in Swedish Människor (och andra arter) har en grundläggande förmåga att anpassa sig till och lära sig hur omgivningen är strukturerad. Ofta lär vi oss struktur indirekt, utan att direkt och avsiktligt studera strukturen ifråga. Klassiska vardagsexempel på tämligen oavsiktlig strukturinlärning är språkinlärning, utveckling av musikaliska preferenser, inlärning av sociala regler, ocPeople can become sensitive to the general structure of different parts of the environment, often without studying that general structure directly, but through being incidentally exposed to instances that conform to the structure. When such learning proceeds unintentionally and gives rise to knowledge that is difficult to verbalize it is often referred to as implicit learning. One of the most comm

Popular Abstract in Swedish Vi människor konsumerar en ständigt ökande mängd elektrisk energi, som till största delen produceras av ändligt tillgängliga material som kol, gas, olja och uran. Elproduktionen har många skadliga bieffekter, som till exempel utsläpp av växthusgasen koldioxid vid förbränning av kol, gas och olja. Solceller omvandlar istället solens ljus direkt till elektricitet. ProcessIn this thesis, in situ doping during growth of III-V semiconductor nanowires, primarily for photovoltaic applications, is investigated. The nanowires were grown by metalorganic vapor phase epitaxy (MOVPE), with gold seed particles. After growth the nanowires were characterized using various techniques, including photoluminescence, transmission electron microscopy and electrical measurements of co

During the latest years the research on the effects of moisture on clothing system has been boosted. New information has revealed phenomena, e.g. “heat pipe” effect with its condensation-evaporation cycle(s) that has not been considered earlier in prediction of physiological reactions or evaluating clothing properties. Considering the material properties, e.g. the evaporative resistance measuremen