Sökning: "alternative stable states"

Visar resultat 16 - 20 av 29 avhandlingar innehållade orden alternative stable states.

  1. 16. Pikeivory: behavioural mechanisms in northern pike piscivory

    Författare :Anders Nilsson; Enhet akvatisk ekologi; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; northern pike; cannibalism; kleptoparasitism; predation; optimal foraging; Animal ecology; Djurekologi;

    Sammanfattning : Optimal foraging and prey preference in top predators may affect population and community dynamics and structure. Also, optimal foraging and prey preference may shift with prevailing conditions, and therefore create changes in the effect of predation. LÄS MER

  3. 17. Dynamic regulation of DNA methylation in human T-cell biology

    Författare :Antonio Lentini; Colm Nestor; Mikael Benson; Huan Zhang; Mika Gustafsson; Ian R. Adams; Linköpings universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES;

    Sammanfattning : T helper cells play a central role in orchestrating immune responses in humans. Upon encountering a foreign antigen, T helper cells are activated followed by a differentiation process where the cells are specialised to help combating the infection. LÄS MER

  4. 18. Diamond Devices Based on Valley Polarization

    Författare :Nattakarn Suntornwipat; Jan Isberg; Markus Gabrysch; Saman Majdi; Hitoshi Umezawa; Uppsala universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; CVD diamond; valleytronics; Negative Differential Mobility; NDM; electron polarization; Time-of-Flight; magnetotransport; carrier transport; drift velocity; valley-transistor; Transferred-Electron Oscillator; TEO; TED; Gunn diode;

    Sammanfattning : Diamond is a wide bandgap semiconductor with extreme properties such as high thermal conductivity, high breakdown field, high carrier mobilities and chemical inertness. These properties together with the possibility to synthesize high purity Single-Crystalline (SC) diamond by Chemical Vapor Deposition (CVD), make it a very interesting material and a candidate for use in power electronics and in hazardous environments. LÄS MER

  5. 19. Towards a Sustainable Food System : Entrepreneurship, Resilience and Agriculture in the Baltic Sea Region

    Författare :Markus Larsson; Rebecka Milestad; Höjer Mattias; Thomas Hahn; Lars Drake; KTH; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Sustainable agriculture; eutrophication; Baltic Sea; entrepreneurship; resilience; sustainable food system; Hållbart jordbruk; övergödning; Östersjön; entreprenörskap; resiliens; hållbart livsmedelssystem; Planering och beslutsanalys; Planning and Decision Analysis;

    Sammanfattning : This thesis compares conventional agriculture and Ecological Recycling Agriculture (ERA) in terms of their environmental and socio-economic effects. Environmental effects include greenhouse gas emissions and energy use, but this analysis focuses on nutrient losses. LÄS MER

  7. 20. Fuel Reforming for Hydrogen Production in Heavy-Duty Vehicle Applications

    Författare :Moa. Z. Granlund; Lars. J. Pettersson; Robert J. Farrauto; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; aging · autothermal fuel reforming · CeO2-ZrO2 · characterization · diesel · H2-assisted HC-SCR · micro reactor · monolith; Chemical Engineering; Kemiteknik;

    Sammanfattning : The depletion of fossil fuels together with growing environmental concerns have created incitement for developing a more energy-efficient and environmentally-friendly vehicle fleet. The development towards cleaner heavy-duty vehicles started already in the 80’s with the introduction of emission legislations. LÄS MER