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Substrate Control in Fed-Batch Cultivations Using a Model-Based Modification of a PI-Controller

A fedbatch process shows exponential growth under ideal conditions. To obtain good substrate concentration control it is necessary that the regulator can track an exponentially growing feed demand, and standard PI-control has to be supplemented with an estimated basic dosage to get reasonable control. However, an exponentially growing concentration error is impossible to avoid. An I-term could be

African farm trajectories and the sub-continental food crisis

This is a study of farm dynamics in eight African countries, drawing on a sample of more than 3000 farm households. It deals mainly with food crops and in detail with maize and makes a longitudinal analysis by systematically comparing current conditions with those obtaining when the farm was set up under its present management. From the study emerges an overall picture of inadequately exploited pr

Second Generation Mothers. Do the children of immigrants adjust their fertility to host country norms?

This chapter explores the fertility behavior, specifically the transition to parenthood, of the second generation, i.e. the children of immigrants, in Sweden from an integration perspective. We examine the impact of education, income, labor market attachment, nationality and immigrant experience on first births of second generation women and contrast it with that of the native Swedish-born populat

Political Structure and Public Policy Conflict Management: A Comparative Study on Thailand and Malaysia

Public policy conflicts emerge when feelings of scarcity and different interests dominate interactive process among the government and the public. The stakeholders struggle in a lower violence capacity but broad range of conflicting issues. Thus, some parties may use cooperative or/and competitive conflict management approaches to achieve their goals. This thesis argues that different political st