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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
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
Hydro-economic Modeling for Optimization of Sustainable Water Management of a River Basin in the Wake of Climate Change: Case Study of the Zarrine River Basin (ZRB), Iran
(2018-11)
Food and water security will be a great future challenge due to the growth of population and unsustainable water usage. The renewable water resources in the MENA region including Iran, are expected to decline. This situation is exacerbated by the increasing demands and the rising climate variability in the wake of global climate change affecting adversely the available water resources. This thesis research attempts to evaluate the impacts of climate change and water demands on the hydrological and environmental ...
Dissertation
Estimating the Effects of Climate Change on the Water Resources in the Upper Indus Basin (UIB)
(2018)
Water balance calculations and spatially distributed rainfall-runoff models require high-resolution climatic datasets as the primary input, however, in the Upper Indus basin (UIB), it is rare to find in-situ observational climate data which have spatial, altitudinal and temporal coverage, suitable enough for distributed hydrological investigations and so for the assessment of climate-change’s hydrological impacts. The average precipitation amounts over the UIB are unrealistically low to sustain the observed discharge ...
Aufsatz
Meshing highly regular structures: The case of super carbon nanotubes of arbitrary order
(2015)
Mesh generation is an important step inmany numerical methods.We present the “HierarchicalGraphMeshing” (HGM)method as a novel approach to mesh generation, based on algebraic graph theory.The HGM method can be used to systematically construct configurations exhibiting multiple hierarchies and complex symmetry characteristics. The hierarchical description of structures provided by the HGM method can be exploited to increase the efficiency of multiscale and multigrid methods. In this paper, the HGM method is employed ...
Konferenzveröffentlichung
The logarithmic finite element method: Approximation on a manifold in the configuration space
(International Association for Computational IACM, 2018)
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
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 ...
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
Punching Shear Behavior of UHPC Flat Slabs
(2014-09-25)
At the Institute of Structural Engineering of the Faculty of Civil Engineering, Kassel University, series tests of slab-column connection were carried out, subjected to concentrated punching load. The effects of steel fiber content, concrete compressive strength, tension reinforcement ratio, size effect, and yield stress of tension reinforcement were studied by testing a total of six UHPC slabs and one normal strength concrete slab.
Based on experimental results; all the tested slabs failed in punching shear as a ...