Evaluation of an evaluation list for model complexity

This study (‘WOt-werkdocument’) builds on the project ‘Evaluation model complexity’, in which a list has been developed to assess the ‘equilibrium’ of a model or database. This list compares the complexity of a model or database with the availability and quality of data and the application area. A model or database is said to be in equilibrium if the uncertainty in the predictions by the model or database is appropriately small for the intended application, while the data availability supports this complexity. In this study the prototype of the list is reviewed and tested by applying it to test cases. The review has been performed by modelling experts from within and outside Wageningen University & Research centre (Wageningen UR). The test cases have been selected form the scientific literature in order to evaluate the various elements of the list. The results are used to update the list to a new version

White matter disorders: MRI - pathology correlations

Knaap, M.S. van der [Promotor]Barkhof, F. [Promotor]Pouwels, P.J.W. [Copromotor]Kamphorst, W. [Copromotor

Backcasting for transformative water management

This thesis reports on a study on the use of backcasting for climate adaptation in water management. It offers new insights and recommendations for the further development of backcasting approaches for transformative climate adaptation

Backcasting for transformative water management

This thesis reports on a study on the use of backcasting for climate adaptation in water management. It offers new insights and recommendations for the further development of backcasting approaches for transformative climate adaptation

Food Quality in Producer-Grazer Models: A Generalized Analysis

Stoichiometric constraints play a role in the dynamics of natural populations, but are not explicitly considered in most mathematical models. Recent theoretical works suggest that these constraints can have a significant impact and should not be neglected. However, it is not yet resolved how stoichiometry should be integrated in population dynamical models, as different modeling approaches are found to yield qualitatively different results. Here we investigate a unifying framework that reveals the differences and commonalities between previously proposed models for producer-grazer systems. Our analysis reveals that stoichiometric constraints affect the dynamics mainly by increasing the intraspecific competition between producers and by introducing a variable biomass conversion efficiency. The intraspecific competition has a strongly stabilizing effect on the system, whereas the variable conversion efficiency resulting from a variable food quality is the main determinant for the nature of the instability once destabilization occurs. Only if the food quality is high an oscillatory instability, as in the classical paradox of enrichment, can occur. While the generalized model reveals that the generic insights remain valid in a large class of models, we show that other details such as the specific sequence of bifurcations encountered in enrichment scenarios can depend sensitively on assumptions made in modeling stoichiometric constraints.Comment: Online appendixes include

De hongerpoliklinieken te Amsterdam in 1945

De bedoeling van deze disssertatie is geweest een overzicht te geven van de op de hongerpoliklinieken verzamelde gegevens. Van vele der waargenomen feiten zijn in de literatuur geen nadere bijzonderheden bekend. In het nu volgende is getracht een vergelijkiing te treffen tussen hetgeen is waargenomen en hetgeen in de literatuur bekend is. Zie: Samenvatting (slotopmerkingen