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Dissertation
Das Einzugsgebiet der Fulda - Untersuchung der Methoden der Hochwasserstatistik im Zeichen des Klimawandels
(2011-10-26)
Numerous studies have proven an effect of a probable climate change on the hydrosphere’s different subsystems. In the 21st century global and regional redistribution of water has to be expected and it is very likely that extreme weather phenomenon will occur more frequently. From a global view the flood situation will exacerbate. In contrast to these discoveries the classical approach of flood frequency analysis provides terms like “mean flood recurrence interval”. But for this analysis to be valid there is a need ...
Dissertation
Numerical Feasibility Study for Treated Wastewater Recharge as a Tool to Impede Saltwater Intrusion in the Coastal Aquifer of Gaza – Palestine
(2014-04-02)
The ongoing depletion of the coastal aquifer in the Gaza strip due to groundwater overexploitation has led to the process of seawater intrusion, which is continually becoming a serious problem in Gaza, as the seawater has further invaded into many sections along the coastal shoreline.
As a first step to get a hold on the problem, the artificial neural network (ANN)-model has been applied as a new approach and an attractive tool to study and predict groundwater levels without applying physically based hydrologic ...
Dissertation
Application and Analysis of physical and data-driven stochastic hydrological Simulation-Optimization Methods for the optimal Management of Surface-Groundwater Resources Systems: Iranian Cases Studies
(2017-08-09)
Application of physical and data-driven stochastic hydrological simulation-optimization techniques is a major title in water resources planning for the prediction of future water-affecting events and conditions. Appropriate models and algorithms such as conceptual surface-groundwater models, artificial intelligence models (ANN), swarm intelligence and fuzzy logic have been developed and used in many research projects of conjunctive management of surface-groundwater resources in recent years. The use of these models ...
Dissertation
Zum Querkrafttragverhalten von UHPC-Balken mit kombinierter Bewehrung aus Stahlfasern und Stabstahl
(Kassel Univ. Press, 2015)
Ultrahochfester Beton besitzt aufgrund seiner Zusammensetzung eine sehr hohe Druckfestigkeit von 150 bis über 200 N/mm² und eine außergewöhnlich hohe Dichtigkeit. Damit werden Anwendungen in stark belasteten Bereichen und mit hohen Anforderungen an die Dauerhaftigkeit des Materials ermöglicht. Gleichzeitig zeigt ultrahochfester Beton bei Erreichen seiner Festigkeit ein sehr sprödes Verhalten. Zur Verhinderung eines explosionsartigen Versagens werden einer UHPC-Mischung Fasern zugegeben oder wird eine Umschnürung mit ...
Dissertation
Large Numerical Models in Continuous Hybrid Simulation
(2016-10-20)
Hybrid simulation is a technique that combines experimental and numerical testing and has been used for the last decades in the fields of aerospace, civil and mechanical engineering. During this time, most of the research has focused on developing algorithms and the necessary technology, including but not limited to, error minimisation techniques, phase lag compensation and faster hydraulic cylinders. However, one of the main shortcomings in hybrid simulation that has pre- vented its widespread use is the size of the ...
Dissertation
Influence of Calcium Aluminate Cement and Ground Granulated Blast Furnace Slag on the Synthesis of Rice Husk Ash-Based Geopolymer Mortars
(2018-02-26)
The manufacture of Portland cement is energy intensive and is associated with carbon dioxide emission of approximately 7% of total global emission. The process also produces pollution in the forms of dust, noise, and vibration with operating machinery during blasting in quarries. Geopolymer material is formed through the reaction of silica and alumina oxides with alkali activator and has appeared as a viable alternative to the Portland cement in the construction field due to good properties such as high compressive, ...
Dissertation
The prediction of seasonal and inter-annual climate variations and their impacts on the water resources in the eastern seaboard of Thailand
(2015-04-27)
The research of this thesis dissertation covers developments and applications of short-and long-term climate predictions. The short-term prediction emphasizes monthly and seasonal climate, i.e. forecasting from up to the next month over a season to up to a year or so. The long-term predictions pertain to the analysis of inter-annual- and decadal climate variations over the whole 21st century. These two climate prediction methods are validated and applied in the study area, namely, Khlong Yai (KY) water basin located ...
Dissertation
Experimental and numerical Investigations of Tracer- and Density- dependent Transport in highly stochastic heterogeneous porous Media and Evaluation of transverse Macrodispersion
(2017-11-27)
Experimentelle und numerische Untersuchungen der dichteabhängigen Strömung und des Transportes gelöster Stoffe in einem sandbepackten Labortank sind wichtig für das Verständnis des Prozesses der Erneuerung von Aquifer. Am Hydrauliklabor der Universität Kassel werden solche Experimente zur Analyse von Makrodispersionseffekte auf eine Frisch-Salzwasser-Grenzfläche innerhalb der heterogen gepackten Sandstruktur mit vorgegebenen stochastischen Eigenschaften in einem Plexiglastank mit den Maßen 9.8×0.1 × 1.225 m durchgeführt. ...
Dissertation
Virtual portfolios for earthquake insurance related risk simulations
(2018-04-05)
Seismic Risk, a combination of Hazard, Vulnerability and Loss, is becoming a mainstream topic due to an increase in the losses and damage caused by earthquake related effects worldwide.
Therefore, it has become an important aspect for insurer and reinsurers since it is extremely difficult to assess due to the lack of the necessary data compared, for example, to car insurance (chapter 1). As described in chapter 2, where the state of the art of seismic risk assessment and simulation is described alongside a more ...
Dissertation
Untersuchung der Verstärkung bestehender Stahlbetonkonstruktionen unter Nutzung Ultrahochfesten Betons (UHPC) im Vergleich zu herkömmlichen Verstärkungsmaßnahmen
(2017-12-07)
Aufgrund des hohen Anteils instandsetzungsbedürftiger Gebäude in Syrien spielen Verstärkungsmaßnahmen eine große Rolle im Bauingenieurwesen. Dabei wird den wirtschaftlichen Aspekten besondere Bedeutung beigemessen. Maßnahmen der Gebäudeverstärkung beruhen in Syrien fast nur auf dem Verfahren der Verstärkung durch Stahlbauteile. Für die Verstärkung und Sanierung bestehender Bauwerke und Bauteile sind in Deutschland verschiedene Methoden, wie z. B. Anbringen zusätzlicher Stahlprofile, Kleben von Stahl-, CFK- oder ...