E-Dissertationen: Browsing E-Dissertationen by Title
Now showing items 846-865 of 1014
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Simulated Satellite Formation Flights for Detecting the Temporal Variations of the Earth’s Gravity Field
Elsaka, Basem Abd Elkareem Anwar (2010-07-09)In this thesis, the concept of satellite formation flight (SFF) is studied by means of simulated satellite observations. With various formation types enabling inter-satellite measurements in various directions (e.g. ... -
Singular Value Decomposition and Cluster Analysis as Regression Diagnostics Tools in Geodetic VLBI
Vennebusch, Markus (2007)It is well known that high-leverage observations significantly affect the estimation of parameters. So far, mainly redundancy numbers have been used for the detection of single high-leverage observations or of single ... -
Social interactions, aspirations, and agricultural innovations: Linkages with income and food security in rural Ethiopia
Mekonnen, Daniel Ayalew (2016-11-09)The persistence of poverty in some parts of the society across the globe inspired recent studies in development economics to embrace the use of multidisciplinary tools and concepts to better understand the situation of the ... -
Socio-environmental impacts of settlement growth under conditions of fostered infill development: a methodological framework for a multicriteria assessment
Schetke, Sophie (2010-09-07)The major objective of this study is to analyze socio-environmental conditions under which a sustainable and resource-preserving settlement development can be promoted and to assess respective impacts of greenfield and ... -
Soil and water conservation technologies in the West African Sudan Savanna: Cropping system options to address variability of crop yield and impacts of climate change
Danso, Isaac (2015-12-03)In the Sudan Savanna region of West Africa, smallholder agricultural production is almost entirely rain-fed. Some of the major constraints to crop production are low soil fertility and high intra- and inter-annual rainfall ... -
Soil attribute changes along chronosequences of land use in the littoral wetlands of Lake Naivasha, Kenya
Dold, Christian (2014-11-14)Lake Naivasha is a freshwater lake in the East African Rift Valley, which was affected by a continuously declining water level between 1980 and 2011. The newly exposed littoral area has been gradually put under agricultural ... -
Soil erosion modeling and soil quality evaluation for catchment management strategies in northern Ethiopia
Tesfahunegn, Gebreyesus Brhane (2011-11-02)About 85% of the Ethiopian population is engaged primarily in agriculture. However, changing environmental factors have led to soil quality (SQ) degradation that poses a critical risk for food security. But, despite some ... -
Soil Erosion under Spatially Heterogeneous Field Conditions: Experimental Analysis and Dynamic Modeling
Raza, Ahsan (2023-06-28)Soil erosion is a significant problem for most of the agroecosystems worldwide, as it is one of the primary causes of soil degradation caused by a loss of the topsoil layer. Most of the existing soil erosion models provide ... -
Soil microaggregates as habitat for microorganisms
Biesgen, Danh (2022-07-27)Aggregation of soil particles is one of the most characteristic features of terrestrial soils and crucial for their functionality. Despite the high relevance of soil aggregates, only little is known about their genesis and ... -
Soil organic carbon pools and their spatial patterns: rapid assessment using mid-infrared spectroscopy
Bornemann, Ludger Clemens (2011-02-09)Soil organic carbon (SOC) plays an important role in global C cycling. Until today, the spatial patterns of individual SOC fractions are, however, largely undiscovered as traditional methods for their determination are too ... -
Soil water availability in agriculturally used wetlands of East Africa
Böhme, Beate (2015-07-07)Wetlands contribute increasingly to the food needs and income generation of the rural population in East Africa. The transformation of wetlands into farmland has gained momentum due to a growing food demand, upland shortages ... -
Solubility and Stability of Natural Food Colorants in Microemulsions
Abd El-Galeel, Mohamed Awad Saad (2002)Several microemulsion systems were prepared by using different natural oils such as peppermint oil alone or mixed with a common edible oils (soybean, peanut or rapeseed oil), different surfactants such as lecithin, monoolein ... -
Sorption, Transformation and Transport of Sulfadiazine in a loess and a sandy Soil
Sittig, Stephan (2014-12-10)Veterinary antibiotics are unintentionally introduced into the environment and therefore found in ground and surface water, soil and sediments, air, plants etc. They enter these compartments mainly via application of manure ... -
Soviet tractors vs. oxen: agroecology, agricultural policies and political discourse in Cuba
Figueroa Alfonso, Galia (2022-12-07)After the collapse of the socialist bloc in the late 1980s and early 1990s, the Cuban government was forced to forsake its plans to develop a modern agricultural sector, highly dependent on the intensive use of imported ... -
Spatial competition of learning agents in agricultural procurement markets
Khalili, Hamed (2019-07-15)Spatially dispersed farmers supply raw milk as the primary input to a small number of large dairy-processing firms. The spatial competition of processing firms has short- to long-term repercussions on farm and processor ... -
Spatial Targeting of Payments for Environmental Services in Costa Rica: A Site Selection Tool for Increasing Conservation Benefits
Wünscher, Tobias (2009-06-30)Payments for environmental services (PES) have become an increasingly popular market-based instrument to translate external, non-market environmental services into financial incentives for landowners to preserve the ... -
Spatial variation of biomass energy supply and demand in rural Nepal
Adhikari, Narayan Prasad (2017-02-24)In Nepal, the share of biomass in total energy consumption is about 88 % and of biomass for cooking and heating about 90 % in 76 % of the households. Fuelwood, crop residues and dung are the three main biomass types. The ... -
Spatially explicit modeling of sorghum (Sorghum bicolor (L.) Moench) production on complex terrain of a semi-arid region in Ghana using APSIM
Kpongor, Dilys Sefakor (2007)An increasing human population and decreasing fallow periods have resulted in a rapid decline in soil productivity in the semi-arid region of Ghana, which is characterized by low-input subsistence agriculture. Soils are ... -
Spatio-temporal dynamics of bush-fire nutrient losses and atmospheric depositional gains across the northern savanna region of Ghana
Kugbe, Joseph Xorse (2012-10-12)This study estimates the nutrient balance between annual fire-induced nutrient transfers and bulk (wet plus dry) atmospheric nutrient deposition. In the subsistence-based and fertilizer-limited agriculture of northern Ghana ... -
Spatio-temporal landscape transformations in Southern Chile and its implications on ecosystem services supply and beneficiaries
Locher Krause, Karla Estela (2020-03-10)Human-induced global change has driven drastic modifications of ecosystems that could lead to unexpected and unprecedented transformations in the present and future decades. Current systems modifications increased the need ...