Sökning: "facets"

Visar resultat 21 - 25 av 201 avhandlingar innehållade ordet facets.

  1. 21. Novel architectured, dislocation-free, III-Nitride structures for the next generation optoelectronic devices

    Författare :Maryam Khalilian; NanoLund: Centre for Nanoscience; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; III-Nitride materials; heteroepitaxy; 3D growth mode; optoelectronic devices; Fysicumarkivet A:2019:Khalilian;

    Sammanfattning : III-Nitride (III-N) materials are promising building blocks of optoelectronic devices such as light emitting diode and laser diode due to the unique material properties. Furthermore, direct and tunable band gaps of III-N materials enable them to cover the entire visible-UV region of electromagnetic spectrum for device applications. LÄS MER

  3. 22. Essays on Family Dynamics : Partnering, Fertility and Divorce in Sweden

    Författare :Linus Andersson; Michael Gähler; Juho Härkönen; Frida Rudolphi; Trude Lappegård; Stockholms universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Fertility; Divorce attitudes; Sweden; Educational Homogamy; Life Course; Family Dynamics; Sociology; sociologi;

    Sammanfattning : Diversity in household and family structures poses interesting questions for scientific inquiry. What accounts for patterns of reproduction, partnering, household formation and household dissolution? This dissertation investigates facets of this question in the context of modern Sweden from a longitudinal and individual level perspective. LÄS MER

  4. 23. Mining Web Logs to Improve User Experience in Web Search

    Författare :Libertad Tansini; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Web log mining; web search; user intent; user recommendation; user modelling;

    Sammanfattning : The World Wide Web continues to grow in size and diversity and this makes it increasinglyhard for users to find valuable information because of heterogeneous form and contentof the documents, little knowledge about the reliability and prestige of the documents anda great deal of redundancy.Usually search engines look for documents that contain specific keywords or phrasesstated by the users as queries. LÄS MER

  5. 24. Dissociative Adsorption of CO2 on Copper: The Role of Steps

    Författare :Benjamin Hagman; Synkrotronljusfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; koppar; CO2; Copper surface; Carbon Dioxide : chemistry; Dissociative adsorption; Surface oxidation; Ambient pressure X-ray photoelectron spectroscopy APXPS ; Surface X-ray diffraction SXRD ;

    Sammanfattning : CO2 chemistry has received significant interest in recent time, due to the greenhouse effects of CO2 emissions and the resulting climate change. CO2 reduction reactions, such as methanol synthesis and reverse water-gas shift, is providing a route for recycling of CO2 and thus limiting the CO2 emissions. LÄS MER

  7. 25. Ommatidial adaptations for vision in nocturnal insects

    Författare :Rikard Frederiksen; Biologiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Gain of transduction; Information rate; Signal-to-noise ratio; Apposition eye; Optical sensitivity; Nocturnal insects; Superposition eye; Vision;

    Sammanfattning : Nocturnal vision is a demanding task for insects with small eyes. As it gets dimmer the noise imposed by the stochastic nature of photon arrival makes vision unreliable. Despite this, there are quite a number of animal species that are active at night and apparently see well. LÄS MER