Sökning: "population theory"

Visar resultat 6 - 10 av 493 avhandlingar innehållade orden population theory.

  1. 6. Inbreeding, Effective Population Sizes and Genetic Differentiation : A Mathematical Analysis of Structured Populations

    Författare :Fredrik Olsson; Ola Hössjer; Steinar Engen; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; matematisk statistik; Mathematical Statistics;

    Sammanfattning : This thesis consists of four papers on various aspects of inbreeding, effective population sizes and genetic differentiation in structured populations, that is, populations that consist of a number of subpopulations. Three of the papers concern age structured populations, where in the first paper we concentrate on calculating the variance effective population size (NeV) and how NeV depends on the time between measurements and the weighting scheme of age classes. LÄS MER

  3. 7. Kameran i krig : den fotografiska iscensättningen av Vietnamkriget i svensk press

    Författare :Kari Andén-Papadopoulos; Peter Larsen; Stockholms universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; war photography; Vietnam war; media; visual communication; documentary photography; photo history; photo theory; Sweden; gender theory; masculinity; femininity; postcolonial theory; cultural studies; ideologies; medie- och kommunikationsvetenskap; Media and Communication Studies;

    Sammanfattning : The doctoral thesis deals with the problems of (news) photographic representation in general, and is based on an empirical study ofVietnam War photography in four major Swedish daily newspapers. A more specific aim of the thesis is to investigate and ideologically evaluate the representational strategies of the press photographs. LÄS MER

  4. 8. Ecostrategies in theory and practice : Farmer's perspectives on water, nutrients and sustainability in low-resource agriculture in the dry zone of Sri Lanka

    Författare :Klas Sandell; Linköpings universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Attitudes towards nature; Alternative development; Carrying capacity; Development strategies; Development theory; Diffusion; Dry zone of Sri Lanka; Ecodevelopment; Ethnoperspective; Fertilizers; Green revolution; Human ecology; Human geography; Low-resource agriculture; Small-scale farming; Sustainable development; Village irrigation.; INTERDISCIPLINARY RESEARCH AREAS; TVÄRVETENSKAPLIGA FORSKNINGSOMRÅDEN;

    Sammanfattning : PROBLEMThe need for a sustainable man - nature relationship has long been a neglected aspect of development theory. The increasing awareness of this negligence has led to a search for development strategies alternative to conventional industrial growth. LÄS MER

  5. 9. Genetic variation in structured populations

    Författare :Marina Rafajlovic; Göteborgs universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; genetic variation; varying population size; effective population size; mutation; recombination; migration; multiple paternity; geographic structure; tests of neutrality; gene tree; species tree;

    Sammanfattning : It is widely acknowledged that the process of speciation in the presence of gene flow between different ecotypes is common in nature. However, the mechanisms underlying speciation are not understood. LÄS MER

  7. 10. Asymptotics, weak convergence and duality in population genetics

    Författare :Martina Favero; Henrik Hult; Alison Etheridge; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : This thesis consists of four papers on asymptotic results and stochastic duality for some processes in mathematical population genetics. The focus is on Wright-Fisher diffusions and coalescent processes, which model, respectively, the evolution of frequencies of genetic types and genealogies in a population,and play a key role in inference on genetic data sets. LÄS MER