This database contains bibliographic descriptions of all Wageningen University PhD theses from 1920 onwards. It is updated on a daily basis by WUR Library.
Author abstracts and/or summaries are added to all descriptions. A link to the full text dissertation is added to the bibliographic description. In a few cases, no electronic version is available, mostly because of copyright issues.
Hard copies of all theses are available for loan at WUR Library. To request them, click the link Request this publication in the full record presentation. This is a fee based service.
irrigation - management - zimbabwe - policy - agrarian reform - theory - practice
Abstract: This thesis focuses on smallholder Irrigation Management Reform (IMR) policy models implemented in Mashonaland West and Mashonaland Central provinces of Zimbabwe. In particular it is concerned with how the models were negotiated, recursively shaped, adopted, transformed and accepted into policy by an array of actors spanning across international funding agencies, government ministries, local agencies responsible for smallholder irrigation development, the irrigators and their surrounding communities. The thesis intends to add to the growing body of debate on IMRs by providing information on ‘the reform process,’ an aspect that has been underplayed so far. It also aims to contribute to the development of an irrigation management policy for the smallholder irrigation sector in Zimbabwe that has been lacking to date.
Abstract: Cowpea, chickpea and yellow pea starches were studied and the results showed that their properties were strongly related to the chemical fine structures of the starches. Furthermore, granular starches were modified using two types of chemical acetylation reagents and then separated into different size fractions. The amount of introduced acetyl groups was found to depend on the size of the granules for the reaction with rapidly reacting reagent acetic acid anhydride, whereas the amount of introduced acetyl groups was independent from the granule size for reaction with the slowly reacting reagent vinyl acetate. Modification with the two types of reagents resulted in significant difference in physical properties of the starches. The investigation on the chemical fine structure of modified starches suggested that the distribution of acetyl groups over both the amylose and amylopectin populations of the starches was different, not only at molecular level but also at granular level.
anaemia - iron deficiency anaemia - iron - fortification - nutritional state - school children - vietnam - supplementary feeding
Abstract: The present thesis aimed to determine the efficacy of a school-based food fortification program to improve hemoglobin concentrations and iron stores of intestinal parasites-prone school children. Furthermore this thesis also compares the effect of iron fortification and iron supplementation on the changes in hemoglobin and iron status.
land use - habitats - physical planning - nature conservation - argentina - ecological network - habitat fragmentation
Abstract: This thesis aims at developing tools to mitigate the process of natural habitat fragmentation related to deforestation, which is becoming a crucial conservation issue in the Yungas, a mountain subtropical forest in the northwest of Argentina. The conservation of forest connections among protected areas is one of the principal targets of nature conservation action in the region, and therefore a major objective of our development. A multi-temporal approach to analyze the evolution of the land use and cover change (LUCC) is proposed. A spatially explicit quantitative analysis of the historical sequence of deforestation for the period 1973 - 2000 is presented. In this period, 80,000 ha have been deforested. This gives an actual indication of the intensity of the conversion of native forest into farmland (farmland area increased from 5 % to 11 % of the total region). A conceptual model depicting the main driving forces interacting from global to local level is formulated. A logistic regression analysis allowed the identification of the spatial determinants (as local proximate variables) for the location of possible future changes in land use. These variables (soil classes, accessibility, slope) were integrated using a GIS procedure that produced a LUCC probability spatial model. This has the principal purpose of predicting the location of future clearings.
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