Sökning: "annual cycles"

Visar resultat 1 - 5 av 49 avhandlingar innehållade orden annual cycles.

  1. 1. Migratory behaviour of Baltic salmon (Salmo salar L.) : adaptive significance of annual cycles

    Författare :Torleif Eriksson; Lars-Ove Eriksson; Kees Groot; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Migratory behaviour; annual cycles; Baltic salmon; Salmo salar; annual time program; swimming behaviour; mortality; maturity; life history;

    Sammanfattning : This thesis evaluates the adaptive significance of annual cycles on the migratory behaviour of Baltic salmon (Salmo salar L.). The studies have included field experiments as well as laboratory studies gf maturity and migratory behaviour patterns of smolts and postsmolts mainly from the Angerman river population. LÄS MER

  3. 2. Celestial Cycles : Astronomical Concepts of Regeneration in the Ancient Egyptian Coffin Texts

    Författare :Patrik Wallin; Katja Goebs; Uppsala universitet; []
    Nyckelord :HUMANIORA; HUMANITIES; NATURVETENSKAP; NATURAL SCIENCES; Archaeology; Ancient Egypt; Coffin Texts; Astronomy; Middle Kingdom; calendars; time; Arkeologi; Archaeology subjects; Arkeologiämnen; Egyptology; Egyptologi; Informatics; computer and systems science;

    Sammanfattning : This study analyzes the astronomical references found in the ancient Egyptian Coffin Texts. Chapter i presents the aim and method of this study as well as describing the primary sources and previous research. Chapter 2 deals with the conceptual background for the three cycles, as related to the year, month and the day as units of time. LÄS MER

  4. 3. Closing nutrient cycles

    Författare :Usman Akram; Uno Wennergren; Karin Tonderski; Genevieve Metson; Bob Rees; Linköpings universitet; []
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : Adequate and balanced crop nutrition – with nitrogen (N), phosphorus (P), and potassium (K) – is vital for sustainable crop production. Inadequate and imbalanced crop nutrition contributes to the crop yield gaps – a difference in actual and potential crop yield. LÄS MER

  5. 4. Empirical essays on unemployment and business cycles

    Författare :Erik Hegelund; Rodney Edvinsson; Fredrik N G Andersson; Josef Taalbi; Jan Ottosson; Stockholms universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; business cycles; Okun’s law; unemployment; capital formation; temporal disaggregation; band spectrum regression; wavelet analysis; ekonomisk historia; Economic History;

    Sammanfattning : This dissertation examines business cycles in Sweden, and the patterns in and driving forces of short- and long-term movements in unemployment in a selection of high-income countries throughout the 20th century. While this has been studied numerous times before, this dissertation starts from the point of view that there is no consensus in social science on how to understand these phenomena. LÄS MER

  7. 5. Thermodynamic Cycles using Carbon Dioxide as Working Fluid : CO2 transcritical power cycle study

    Författare :Chen Yang; Lundqvist Per; Carlos Infante Ferreria; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : The interest in utilizing the energy in low‐grade heat sources and waste heat is increasing. There is an abundance of such heat sources, but their utilization today is insufficient, mainly due to the limitations of the conventional power cycles in such applications, such as low efficiency, bulky size or moisture at the expansion outlet (e.g. LÄS MER