Sökning: "permanence"

Visar resultat 1 - 5 av 16 avhandlingar innehållade ordet permanence.

  1. 1. Interaction strength and keystone species in model food webs

    Detta är en avhandling från Linköping : Linköpings universitet

    Författare :Maria Christianou; Linköpings universitet.; Linköpings universitet.; [2003]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; interaction strength; keystone species; keystone links; permanence; resilience; local stability; Lotka-Volterra models; species loss;

    Sammanfattning : Ecological communities are often exposed to different kind of disturbances of varied magnitude. The response to disturbances can be affected by, among other factors, the strength of interactions between species within the community. LÄS MER

  2. 2. Interaction strength and responses of ecological communities to disturbances

    Detta är en avhandling från Institutionen för fysik, kemi och biologi

    Författare :Maria Christianou; Linköpings universitet.; Linköpings universitet.; [2006]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Species deletion; secondary extinctions; keystone species; keystone links; species reintroductions; Lotka-Volterra models; local stability; permanence; resilience; sensitivity analysis; diversity; complexity; food webs; competition communities; NATURAL SCIENCES; NATURVETENSKAP;

    Sammanfattning : Ecological communities are continuously exposed to natural or anthropogenic disturbances of varied intensity and frequency. The way communities respond to disturbances can depend on various factors, such as number of species, structural characteristics of the community, stability properties, species characteristics and the nature of the disturbance. LÄS MER

  3. 3. Permanence of age-structured populations in a spatio-temporal variable environment

    Detta är en avhandling från Linköping : Linköping University Electronic Press

    Författare :Sonja Radosavljevic; Linköpings universitet.; Linköpings universitet.; [2016]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : It is widely recognized that various biotic and abiotic factors cause changes in the size of a population and its age distribution. Population structure, intra-specific competition, temporal variability and spatial heterogeneity are identified as the most important factors that, alone or in combination, influence population dynamics. LÄS MER

  4. 4. Changeability as a quality in textile design

    Detta är en avhandling från Högskolan i Borås

    Författare :Riikka Talman; Högskolan i Borås.; [2019]
    Nyckelord :HUMANIORA; HUMANITIES; Textiles and Fashion Design ; Textil och mode konstnärlig ;

    Sammanfattning : The tendency to wear out and change is inherent in most materials, but – aside from a few exceptions – has been considered to be undesirable by both the industry and consumers. The work presented in this licentiate thesis suggests that, due to change in some form being an inherent property of textiles, it may be viable to look for alternative ways of designing and perceiving textiles that accept change as one of their qualities. LÄS MER

  5. 5. Med älgen i huvudrollen Om fångstgropar, hällbilder och skärvstensvallar i mellersta Norrland

    Detta är en avhandling från Stockholm : Instutitionen för arkeologi och antikens kultur, Stockholms universitet

    Författare :Ylva Sjöstrand; Stockholms universitet.; [2011]
    Nyckelord :HUMANIORA; HUMANITIES; Stone Age; Northern Sweden; Nämforsen; rock art; pit falls; mounds of burnt stone; affordances; James J. Gibsson; chronology; theories of meaning; key symbols; neolithisation; Archaeology; arkeologi;

    Sammanfattning : The importance of the elk (Alces alces) in the Stone Age societies of northern Sweden constitutes the major focus of this thesis. The point of departure is a simple but crucial observation: this animal is the common denominator between the three stationary types of remains known in this region from the period 4000-1800 BC. LÄS MER