Search for dissertations about: "TWI"
Showing result 1 - 5 of 8 swedish dissertations containing the word TWI.
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1. A GIS-based landscape analysis of dissolved organic carbon in boreal headwater streams
Abstract : In boreal catchments, stream water chemistry is influenced and controlled by several landscape factors. The influence of spatially distributed variables is in turn dependent on the hydrological scale. READ MORE
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2. Plants go with the flow : predicting spatial distribution of plant species in the boreal forest
Abstract : The main objectives of this thesis are to study if a topographic wetness index (TWI) could be used as a tool for predicting the spatial distribution of vascular plant species richness in the boreal forest as well as to study congruence in species richness between vascular plants, liverworts, mosses and lichens. A wetness index ln(a/tanβ) based on topography was used to assign a specific TWI-value to every 20 x 20m grid in two 25 km2 boreal forest landscapes (differing in average soil pH) in northern Sweden. READ MORE
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3. Experimental and theoretical investigation of the laser cutting process
Abstract : This thesis concerns experimental investigations of laser cutting with theoretical and practical discussions of the results. The thesis is made up of three papers which are linked in such a way that each of them studies a different aspect of laser cutting: In paper I the two major laser types in cutting, namely CO2 and fiber lasers, are compared to each other by a self-defined cut efficiency. READ MORE
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4. Hydrological Modelling, Topographical Influence and Yield Mapping in Precision Agriculture
Abstract : The use of topographical data in hydrological and agricultural applications has increased with GPS data availability and the concept of precision agriculture. This thesis investigates the relationships between topography and in one case simulated soil moisture and in the other case yield. READ MORE
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5. Friction stir welding of copper canisters for nuclear waste
Abstract : The Swedish model for final disposal of nuclear fuel waste is based on copper canisters as a corrosion barrier with an inner pressure holding insert of cast iron. One of the methods to seal the copper canister is to use the Friction Stir Welding (FSW), a method invented by The Welding Institute (TWI). READ MORE