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Salinization of soils is a major threat to irrigated agriculture and counteracts the targets of costly public infrastructure investments. In this study, salinization is regarded as the outcome of an institutional arrangement which impedes the effective implementation of well-known and well-established control measures be they technical, managerial or economic. In public irrigation systems neither the management units nor the farmers are offered any incentives towards the control of high groundwater levels and salinization if the management units are embedded in a highly centralized non-market institutional setting. The author answers the question under which conditions management units and irrigators are active in halting and reversing the process of salinization.
The present volume contains the lectures of the symposium on 'Risk and Protective Factors in Schizophrenia - towards a conceptual Model of the Disease Process', which was held at the International Science Forum of the University of Heidelberg on October, 2001. The topics of the program were 'Genetic risk factors and gene environment interaction', 'Psychotic and negative symptoms in the general population as risk-factors', 'Etiological risk factors in embryonal life, childhood and adolescence', 'Prepsychotic prodromi and stage models of the development of psychosis', 'Brain development, structural and functional morphology of the early course', 'Urban versus rural life, migration and social c...
Proceedings of the 4th International Conference on Age-Hardenable Aluminium Alloys, Budapest, Hungary, 1986
Age-hardenable aluminium based alloys have several favourable properties, e.g. high electrical conductivity and good strength with respect to their fairly low density. Among them the Al-Zn system is particularly suitable for studying phase transformations in supersaturated solid solutions from both the technological and the physical point of view. The decomposition processes in the Al-Zn system have been studied by many authors over the last three decades. Thus a huge amount of information concerning the behaviour and properties of Al-Zn alloys is available, which can hardly be overlooked. The authors of this book present a well-structured summary of this knowledge. For better understanding of the processes proceeding in Al-Zn alloys, some general features of binary Al alloys as well as a few theoretical aspects of metal physics are given as introducing chapters. The closing chapter presents interesting new developments af Al-based materials.