Sökning: "bottom-up and top down factors"

Visar resultat 1 - 5 av 25 avhandlingar innehållade orden bottom-up and top down factors.

  1. 1. Petroleum Production and Exploration Approaching the End of Cheap Oil with Bottom-Up Modeling

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Kristofer Jakobsson; Uppsala universitet.; [2012]

    Sammanfattning : The theme of this thesis is the depletion of petroleum (crude oil and natural gas). Are there reasons to be concerned about an ‘end of cheap oil’ in the near future? There is a lively debate regarding this issue. The debate is sometimes described as a clash of ‘concerned’ natural scientists and ‘unconcerned’ economists. LÄS MER

  2. 2. Anthropogenic impact on predator guilds and ecosystem processes Apex predator extinctions, land use and climate change

    Detta är en avhandling från Stockholm : Department of Zoology, Stockholm University

    Författare :Marianne Pasanen Mortensen; Stockholms universitet.; [2014]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Mesopredators; apex predators; top-down; bottom-up; interspecific killing; red fox; Eurasian lynx; grey wolf; wolverine; productivity; winter severity; cropland; zoologisk ekologi; Animal Ecology;

    Sammanfattning : Humans affect ecosystems by changing species compositions, landscape and climate. This thesis aims to increase our understanding of anthropogenic effects on mesopredator abundance due to changes in apex predator status, landscape and climate. LÄS MER

  3. 3. Complexity and Change in a Simple Food Web Studies in the Baltic Sea (FAO Area 27.IIId)

    Detta är en avhandling från Stockholm : Institutionen för systemekologi

    Författare :Henrik Österblom; Stockholms universitet.; [2006]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Avian cholera; Bottom-up; Bycatch; Clupea harengus; Ecosystem; Food web; Gadus morhua; Halichoerus grypus; Regime shift; Sprattus sprattus; Top-down; Trophic cascade; Uria aalge; NATURAL SCIENCES Biology Terrestrial; freshwater and marine ecology Marine ecology; NATURVETENSKAP Biologi Terrestisk; limnisk och marin ekologi Marin ekologi;

    Sammanfattning : An influence at one trophic level can result in dynamic impacts also on other components of a food web. These dynamics are known as trophic cascades, and can be both top-down and bottom-up. After a near-collapse of the Baltic cod Gadus morhua stock in the 1980s, its main prey sprat Sprattus sprattus increased dramatically. LÄS MER

  4. 4. Creating organisational capacity for priority setting in health care using a bottom-up approach to implement a top-down policy decision

    Detta är en avhandling från Umeå : Umeå university

    Författare :Susanne Waldau; Umeå universitet.; [2010]
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Health care; priority setting; implementation; management systems; MEDICINE Social medicine Public health medicine research areas; MEDICIN Socialmedicin Folkhälsomedicinska forskningsområden; folkhälsa; Public health;

    Sammanfattning : In this thesis, priority setting to the form of the Swedish parliamental decision on priority setting, 1997, is considered an innovation for implementation in health care. The features of this innovation are investigated. LÄS MER

  5. 5. Generating Products in Small and Medium Sized Enterprises : Challenges and Potential Improvements

    Detta är en avhandling från Stockholm : Universitetsservice US AB

    Författare :Jörgen Pilemalm; KTH.; [2002]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Integrated product development; Change management; SME; Integrated Product Development; Change Management;

    Sammanfattning : In contemporary society, companies are faced with new demands and challenges, due to increasing competition and customer requirements. The development of products affects to a great extent, the future earnings and costs of an enterprise, and is therefore very important for its long-term survival. LÄS MER