Sökning: "punctuated equilibrium"
Hittade 5 avhandlingar innehållade orden punctuated equilibrium.
Sammanfattning : The theory of “punctuated equilibrium” suggests that species evolve rapidly during or immediately upon speciation, “punctuating” long periods of little or no morphological evolution. Here I confirm that body size differences within clades of birds and mammals are best explained using a model of punctuated evolution. LÄS MER
2. Stochastic Models in Phylogenetic Comparative Methods: Analytical Properties and Parameter Estimation
Sammanfattning : Phylogenetic comparative methods are well established tools for using inter-species variation to analyse phenotypic evolution and adaptation. They are generally hampered, however, by predominantly univariate approaches and failure to include uncertainty and measurement error in the phylogeny as well as the measured traits. LÄS MER
Sammanfattning : This thesis investigates the role of ideas in policy processes. It does so using three theories as a starting point, selected for being alike yet unique in their description of how ideas may “get stuck” in the organization’s production and reproduction of policy. LÄS MER
Sammanfattning : I den snabbt växande litteraturen om idéer i policyprocessen, som ibland kallats ”the ideational turn” tänker man sig ofta att idéer och språk styr politikens aktörer, snarare än styrs av dem. Hur politiska problem formuleras styr vilka lösningar som ter sig rimliga. Intresset riktas mot politik som intellektuell verksamhet. LÄS MER
Sammanfattning : Youth unemployment in Sweden has reached record levels during the first decade of the 21st century. In 1970, the unemployment rate for 20-24 year olds was approximately 2%. Now, forty years later, this rate has risen to 20%. Relative youth unemployment (youth unemployment in relation to unemployment for the 25-64 year olds) has also risen. LÄS MER