Sökning: "N limitation"

Visar resultat 16 - 20 av 42 uppsatser innehållade orden N limitation.

  1. 16. Fish community responses to water colour : results along a large gradient from clear to brown lakes in Sweden

    Master-uppsats, SLU/Dept. Of Aquatic Resources

    Författare :Stephanie Koch; [2019]
    Nyckelord :water browning; climate change; dissolved organic carbon; fish community; ; community composition; ; fish biomass;

    Sammanfattning : An increase of dissolved organic carbon and iron in freshwater bodies across the Northern Hemisphere caused by environmental and land use changes lead to water browning with negative impacts on lake ecosystems. Effects of browning on aquatic ecosystems are complex and include reduced light penetration, thermal stratification, lower macrophyte cover, lower primary productivity, and potential shifts in species composition. LÄS MER

  3. 17. Inter-Satellite Link Antennas : Review and The Near Future

    Master-uppsats, Luleå tekniska universitet/Rymdteknik

    Författare :Arttu Tiainen; [2017]
    Nyckelord :Satellite; ISL; Communications; Antenna;

    Sammanfattning : The emerging trend in distributed spacecraft systems of using multiple spacecraft which share functions as opposed to independent spacecraft has given opportunities for missions previously infeasible. Inter-satellite link (ISL) communications provide a direct link within the space segment without need of an intermediate ground segment to relay the data. LÄS MER

  4. 18. Spacecraft dynamic analysis and correlation with test results : Shock environment analysis of LISA Pathfinder at VESTA test bed

    Master-uppsats, Luleå tekniska universitet/Rymdteknik

    Författare :Beata Iwona Kunicka; [2017]
    Nyckelord :FEA FEM; finite element analysis; finite element method; mechanical analysis; structural analysis; dynamic analysis; computational dynamic analysis of structures; shock analysis; shock environment; shock test; shock test campaign; spacecraft dynamic analysis; MSC Nastran; MSC Patran; Dynaworks; Shock Response Spectrum; SRS; space engineering; space science and technology; mechanical engineering; structural engineering; analysis optimisation; analysis parametrisation; mechanical wave propagation; shock propagation; damping; hysteretic damping; viscous damping; structural damping;

    Sammanfattning : The particular study case in this thesis is the shock test performed on the LISA Pathfinder satellite conducted in a laboratory environment on a dedicated test bed: Vega Shock Test Apparatus (VESTA). This test is considered fully representative to study shock levels produced by fairing jettisoning event at Vega Launcher Vehicle, which induces high shock loads towards the satellite. LÄS MER

  5. 19. Evaluation of Massively Scalable Gaussian Processes

    Master-uppsats, KTH/Matematisk statistik

    Författare :Hanna Hultin; [2017]
    Nyckelord :;

    Sammanfattning : Gaussian process methods are flexible non-parametric Bayesian methods used for regression and classification. They allow for explicit handling of uncertainty and are able to learn complex structures in the data. LÄS MER

  7. 20. Evaluation of the effect of different SCOD/TN ratios in a mainstream nitritation process

    Master-uppsats, Lunds universitet/Kemiteknik (CI)

    Författare :Doaa el Halabi; [2017]
    Nyckelord :Partial nitrification; nitritation; microscreen; filtration; Chemical oxygen demand; moving bed biofilm reactor; Partial nitrification anammox; PNA.; Technology and Engineering;

    Sammanfattning : Avloppsvatten är rikt på organiskt material, det organiska materialet har med fördel använts för biogasproduktion. Den traditionella kvävereningsprocessen kräver organiskt material, därför har ett extern organiskt material använts. LÄS MER