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Visar resultat 1 - 5 av 199 avhandlingar som matchar ovanstående sökkriterier.

  1. 1. Paper planes : labour migration, integration policy and the state

    Författare :Henrik Emilsson; Per Mouritsen; Malmö högskola; []
    Nyckelord :;

    Sammanfattning : This dissertation collects four peer-reviewed articles that are published in academic journals. Two of the articles are about the multi-level governance of integration polices, and two study the effects of labour migration policies. LÄS MER

  3. 2. Lactic acid production: extractive fermentation in aqueous two-phase systems

    Författare :Jordi Planes; Teknisk mikrobiologi; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; gel excludion chromatography; polyethylenimine; ethylene oxide propylene oxide; phase forming polymers; aqueous two-phase systems; extractive fermentation; Lactococcus; Lactobacillus; Mikrobiologi; bakteriologi; virologi; mykologi; bacteriology; virology; mycology; Microbiology;

    Sammanfattning : There is an increased interest in the microbial production of lactic acid as a raw material for the synthesis of lactic acid polymers as biodegradable plastics. However, two factors limit the economical competitiveness of lactic acid production by microorganisms: lactic acid inhibition, which decreases both fermentation rate and the maximum lactic acid concentration, and the efficiency in the recovery of lactic acid. LÄS MER

  4. 3. Géométrie digitale utilisée pour la discretisation et le recouvrement optimal des objets euclidiens

    Författare :Adama Arouna Koné; Christer O. Kiselman; Ouaténi Diallo; Diby Diarra; Gunilla Borgefors; Fana Tangara; Sado Traoré; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Digital geometry; Euclidean lines; planes; Géométrie digitale; droites euclidiens; plans; Mathematics with specialization in Applied Mathematics; Matematik med inriktning mot tillämpad matematik;

    Sammanfattning : A Euclidean line in the plane is discretized and the discretized line is dilated by a rectangle.  The thesis studies the dilations that cover the original line and determine the optimal ones.  Similarly, dilations of discretized Euclidean hyperplanes are studied, and the optimal coverings are described.. LÄS MER

  5. 4. Space in Proof Complexity

    Författare :Marc Vinyals; Jakob Nordström; Yehudayoff Amir; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; proof complexity; resolution; polynomial calculus; cutting planes; space complexity; computational complexity; pebble games; communication complexity; CDCL; Computer Science; Datalogi;

    Sammanfattning : ropositional proof complexity is the study of the resources that are needed to prove formulas in propositional logic. In this thesis we are concerned with the size and space of proofs, and in particular with the latter.Different approaches to reasoning are captured by corresponding proof systems. LÄS MER

  7. 5. Localization effects in ternary nitride semiconductors

    Författare :Vytautas Liuolia; Saulius Marcinkevicius; Toshiharu Saiki; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; AlGaN; InGaN; AlInN; LEDs; near-field microscopy; carrier dynamics; alloy fluctuations; carrier localization; built-in electric field; nonpolar planes; polarized luminescence;

    Sammanfattning : InGaN based blue and near-ultraviolet light emitting diodes and laser diodes have been successfully commercialized for many applications such as general lighting, display backlighting and high density optical storage devices. Despite having a comparably high defect density, these devices are known for their efficient operation, which is attributed to localization in potential fluctuations preventing carriers from reaching the centers of nonradiative recombination. LÄS MER