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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
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 ...
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
The potential of UAV-based remote sensing for the prediction of aboveground biomass and N fixation in legume-grass mixtures
(2020-07)
The world population is growing steadily and with it the demand for meat and animal protein. A major source of feed for livestock is grassland, which serves as high quality and protein rich forage. In addition to permanent grassland, temporary grassland is a valuable crop rotation element, especially in organic farming, since legumes in legume-grass mixtures can fix atmospheric nitrogen (NFix). To further increase the intensification in agriculture, reliable non-destructive measurement techniques are needed as an ...
Dissertation
Development of a decentralized solar assisted milk pasteurizer and improved chiller for rural communities
(2022)
Renewable energy is the only way to cope with changing climate for under-developed countries like Pakistan, particularly solar energy must be opted out due to plentiful sunshine hours. Being a natural liquid food, milk is a complete nutritional diet containing all of the essential minerals such as protein, fat and vitamins. However, improper post milking handling and storage resulting in wastage due to microorganisms and bacterial multiplication. The present study enables the application of decentralized solar-based ...
Dissertation
Technical and Environmental Assessment of Energy and Material Production from Rural and Urban Residual Biomass
(2020-04)
Die vorliegende Arbeit umfasst Studien zur Untersuchung technischer und ökologischer Aspekte bei der Nutzung von Restbiomassen in den Nutzungspfaden Energieerzeugung und Aktivkohleproduktion. Im Mittelpunkt der jeweiligen Untersuchung stand das Verfahren zur integrierten Erzeugung von Festbrennstoff und Biogas aus Biomasse (IFBB) und dessen Einfluss auf technische und ökologische Aspekte bei der Verwertung von Restbiomassen. Im Zuge von Naturschutz- und Landschaftspflegemaßnahmen auf extensiv bewirtschafteten ...
Dissertation
Towards crop communities: exploring wheat diversity, wheat-pea species mixtures and farming practice in a food system context
(2022-06)
This thesis combines experimental work on heterogeneous crop populations (HP) and species mixtures (SM) with a social scientific and participatory approach. Chapter 1 introduces crop communities as a concept to integrate multiple approaches to diversify farming systems. HPs provide intraspecific and SM interspecific diversity in crop communities. A key challenge for the genetic improvement of HPs, especially for root traits is to combine effective selection to improve HPs while maintaining intraspecific diversity. ...
Dissertation
Tree Vigour in Apple Production: Impact of Replant Disease and Mitigation Strategies
(2022)
Cultivating apples on sites previously used for cultivation of apples leads to suppression of vegetative performance of apple trees and losses in fruit yields. This replant effect is attributed to an apple related form of soil fertility loss named ‘soil fatigue’ and ‘Apple Replant Disease’ (ARD). Replant disease strongly affects profitability of apple production in nurseries specialised in fruit trees, as well as on fruit orchards. Recent studies focus on causally linked agents of the replant disease and quantification ...
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
Effect of different types of soil conditioners (plant-derived composts and animal manure) and application methods on quantitative and qualitative characteristics of tomatoes and selected soil parameters
(2018)
World population prospect has increased the need for food production, therefore ensuring the sustainable production of food has been of interest to researchers of agricultural sciences, as well as politicians, due to high demands by consumers in various countries in the world.
In this dissertation, we have investigated the effect of different types of composts, from residual biomass (household compost (HC), Spent mushroom compost (SMC) and Vermicompost (VC)), on different characteristics of plant and soil in organic ...