This thesis focuses on the relationship between ethnic composition and both schooling outcomes and classroom behaviour, making the crucial distinction between the share of migrant-origin students and ethnic diversity. Ethnic school composition is seen as one of the explanations for the inequality of school performance between native- and migrant-origin students in Western societies. Although the use of the concept migrant origin is contested concept, the relationship between ethnic school composition and school performance is of interest to policymakers and social scientists in both the United States and Europe.
Ethnic identity is central to many contemporary discussions of belonging and assimilation of migrant-origin youth. Studies typically focus on a single minority identity. Identity theory implies, however, that individuals may hold multiple ethnic identities, or none, and these may find expression to a greater or less extent depending on context. Using a nationally representative, longitudinal study of Dutch teenagers, we investigate the role of classroom ethnic composition in shaping multiple ethnic identity expression. Framing identity choices as a relational process, we show that the number of ethnic identities that children with a migrant-origin background choose is greater for those students who are exposed to a more ethnically diverse context, while less diverse classrooms foster ethnic identification with no or fewer minority groups. Classification of migrant-origin students with a single (minority) ethnicity may thus be an oversimplification of ethnic identity, even for those from a single country of origin.
Intergroup contexts of classrooms have an influence on mainstream and ethnic belonging of youth of immigrant descent. Based on the normative reference group theory, a higher level of ethic identification is expected in classrooms with a higher proportion of co-ethnic youth and, based on constrict theory, a lower level of mainstream identification is expected in ethnically more diverse classrooms. However, these relations between ethnic composition and cultural belonging may differ between countries due to differences in multicultural policies and colonial histories. Using two waves of data from CILS4EU survey, we conduct a cross-national comparison of the relation between intergroup contexts of classrooms and cultural belonging. The results imply that both theories cannot be generalized across national contexts, and other factors vary as well across countries. Therefore, research and policy in this area should pay more attention to the national context in terms of policies and histories.
Introduction The research group Biobased Resources & Energy (BRE) of Avans focusses on recovery of valuable building blocks from low-value solid and liquid residual streams from agriculture, households and industries. For the valorisation of these residual streams, BRE looks into different biological, chemical and mechanical processes. One of the main issues in the utilisation of residual streams is economic feasibility and the recovery of multiple resources from one residual stream. Using membrane technologies in combination with biological, chemical and/or mechanical processes could offer great opportunities. Central Research Question What is the applicability of membrane technologies for valorisation of different residual streams and is it possible to integrate membrane technology in current and new biorefining projects of research group BRE: Set-up In order to reach the goal of this postdoc, 4 research questions will be answered using literature search, experimentation and modelling: 1) What membrane methods are currently (commercially) available to enhance the results of current projects in research group BRE? 2) What are the essential technical parameters for membrane separation and how can these be optimized? 3) What is the economic impact of using membrane technology in recovery of valuable building blocks from residual streams? 4) What are the effects of using membranes instead of or complementary to currently used methods on the sustainability of valorisation of residual streams? Cooperation The postdoc and the research group BRE want to extend the contact and research cooperation with (regional) businesses and (applied) universities and support and facilitate the introduction and further development of membrane technologies in the curriculum of different Avans study programmes. This will be done via internships, minor projects (together with businesses) and development of study material for courses and trainings.
