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Dissertation
Using Optical Satellite Imagery to Monitor and Understand Agricultural Land-cover Change
(2020-06)
The activities of humans have transformed the earth over the last decades. The transformation is estimated to increase further in response to the growing world population. This has caused many countries to devise means to utilize resources sustainably. Bio-economy is seen as a means to reduce the high reliance on fossil materials and ensure the provision of raw materials, energy and food to the increasing world population in a sustainable manner. However, the rising demands for biomass to produce bioenergy have relied ...
Dissertation
Robustness of portable and laboratory-based visible/near- and mid-infrared spectroscopy for optimized determination of temporally and spatially variable soil properties
(2021)
Application of visible/near- (VISNIRS) and mid-infrared (MIRS) spectroscopy to the field of soil science is promising, as it allows information about a range of properties to be collected simultaneously and rapidly, thereby providing high spatial and temporal resolution data for use in, e.g., soil mapping, precision agriculture, and long-term monitoring. However, investigation of the conditions under which visNIRS and MIRS can replace traditional lab methods is required, as the accuracy, robustness, and efficiency ...
Dissertation
Enhancement of Anaerobic Digestion of Banana Waste by Reactor Design and Substrate Pre-treatment for Improved Biogas Production
(2021)
Bananen sind stärkehaltige Früchte palmenähnlicher tropischer und subtropischer Pflanzen der Gattung musa. Uganda ist der zweitgrößte Bananenproduzent weltweit, mit besonderem Fokus auf der grünen ostafrikanischen Hochlandbanane, wissenschaftlich als Musa acuminata (AAAEA) bekannt, die landesweit unter der Bezeichnung “Matooke” als Grundnahrungsmittel genutzt wird. Die industrielle Verarbeitung dieser Bananen zur Erzeugung hochwertigen glutenfreien stärkehaltigen Mehls, das sowohl zum Backen als auch in glykämischen ...
Dissertation
Optimizing drying processes for agricultural products utilising non-invasive measurement and adaptive control systems
(2021)
With increasing population and global warming, the need for functional yet nutritional food combined with energy efficient processes has risen significantly. The new “Industry 4.0” revolution acknowledging this need aims to develop and improve processes that are affordable as well as sustainable. For a process like drying this means a shift towards smart or intelligent drying systems using a multidisciplinary approach. This encompasses the use of advanced computational algorithms and control systems integrated with ...
Dissertation
Investigation of potential drying strategies for quality maintenance of carrot
(2021-05-27)
Convective drying of carrots is a non-linear and unsteady-state process with simultaneous mechanism of heat and mass transfer leading to time varying quality changes along the process and finally causing irreversible quality modification. Inappropriate drying condition will generate many qualities related problems such as destruction of physical properties and discoloration of carrots causing by mechanical and thermal damage due to over-drying or extended drying periods. Inconsistent quality of the product was also ...
Dissertation
Assessment and use of sea buckthorn and apple diversity in northern Pakistan
(2020-12-03)
Many local perennial plant genetic resources (P/PGR) are under threat due to over-exploitation, depletion, degradation, farmers’ favoring few cash crops, poor marketing conditions leading to low product prices along with the lack of knowledge about alternative uses and management strategies. Such processes often cause the underutilization and replacement of local P/PGR causing them to become neglected and underutilized species (NUS). The decline of species abundance may cause genetic erosion of these NUS crops and ...
Dissertation
Modellbildung zur akustischen Überwachung von Rübenbeschädigungen während des Rodevorganges
(2021)
Zuckerrüben sind in Europa ein bedeutendes Erntegut. Die Rübenernte ist vollmechanisiert, Roden, Entfernen des Blattanteils, Reinigen und Lagern werden in einem Arbeitsgang erledigt. Aufgrund der kurzen Einsatzzeit und den zum Erntezeitpunkt oft nicht optimalen Witterungsbedingungen sind die Maschinen auf Flächenleistung und Abreinigung des Erdanteils optimiert. In der vorliegenden Arbeit wurde die prinzipielle Machbarkeit einer Beschädigungserkennung basierend auf einer Maschinenzustandsüberwachung durch eine Analyse ...
Dissertation
Remote sensing of yield and invasive species in nature conservation grasslands invaded by Lupinus polyphyllus
(2021-07)
Extensiv bewirtschaftetes Grünland und naturnahes Naturschutzgrünland sind wertvolle Bereitsteller von Ökosystemdienstleistungen und könnten eine Schlüsselrolle in zukünftigen Managementstrategien spielen zum Schutz von Arten, die durch den Klimawandel bedroht sind. Jedoch ist extensives Grünland, wie viele andere Ökosysteme, bedroht durch die Ausbreitung invasiver Arten, welche einen großen Einfluss auf den Verlust der Biodiversität haben.
Um den Herausforderungen unserer Zeit zu begegnen, sollten Innovationen in ...
Dissertation
Fine-scale grassland monitoring using unmanned aerial vehicle borne remote sensing
(2020-04)
RS is widely employed as a non-destructive methodology to monitor grasslands. Usage of UAV as the RS platform benefits to provide high spatial (fine-grain) and temporal resolution, unclouded data over small grassland extent. Therefore, this thesis evaluated the applications of UAV-borne RS for fine-scale grassland monitoring along with practical farm condition. Grass biomass estimation, predicting forage quality of grass and mapping invasive lupine in grasslands are considered as applications of UAVborne RS.
Dissertation
Numerical Modeling and Characterization of Drying Process of Agricultural Products
(2021)
The main goal of this work was to experimentally characterize the hot air-drying process of agricultural products (Potato, Carrot, Tomato) and verify it with numerical solutions at single layer and industrial scale dryer using Comsol Multiphysics® 5.3.
Input parameters at single layer dryer effects on quality attributes were examined. Two strategies of drying were applied on batch dryer to examine the input effects on quality attributes. Constant input parameters strategy was designed by using central composite ...