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This project aims to explore the dynamic capabilities of
microrobots to undergo a shape-change through dipole-dipole
interactions in magnetic fields. The project encompasses three
main phases: simulation, fabrication, and application, with a
specific focus on biomedical scenarios. - Engineering and Technology
- Master Thesis, Semester Project
| Using particles as heat transfer medium (HTM) for concentrated solar power (CSP) applications allows for HTM outlet temperatures exceeding 1000°C and convenient thermal energy storage by collecting the heated particles in an insulated silo. When working with a particulate phase, it is important to have control over the residence time of the particles inside the irradiated area of the solar receiver, since this has a direct influence on the average outlet temperature of the solid phase.
An alternative solar particle receiver (SPR) configuration is proposed, in which particles are falling inside a duct against a counter-current air flow. Previous experiments with a similar flow have shown that for solid volume fractions between 0.1% and 0.8%, the average falling velocity of the particle phase could be reduced by the presence of the air flow. These results hint that the residence time of the particles can be adjusted by adjusting the air flow.
This work aims at building the proposed SPR and investigating its hydrodynamics as well as thermal performance for solid volume fractions ranging from 0.1% to 10%. Therefore, a transparent prototype of the facility already exists, and a high-temperature resistant set-up is currently being built.
- Fluidization and Fluid Mechanics, Heat and Mass Transfer Operations, Mechanical Engineering, Turbulent Flows
- ETH Zurich (ETHZ), Master Thesis
| Trifluoroacetic acid (TFA) is a volatile organic acid and a crucial cleavage reagent in solid phase peptide synthesis (SPPS). TFA is also used as an additive in the following chromatographic purification and analysis of peptides to improve separation on reversed phase HPLC columns. Various publications indicate that the secondary structure of synthetic peptides is not only given by the sequence but also by the solvent, counterions, solubilizers and others.1,2 However, a detailed examination of the influence of TFA and other anionic counterions on different secondary structures of synthetic peptides is still missing. - Analytical Chemistry, Biological and Medical Chemistry, Medical Biochemistry: Proteins and Peptides
- Bachelor Thesis, Lab Practice, Master Thesis, Semester Project
| The aim of this project is to segment aortic centrelines from low-resolution MRI data to improve automatic slice planning.
- Engineering and Technology, Information, Computing and Communication Sciences, Mathematical Sciences
- Bachelor Thesis, Semester Project
| Metal nitrides are a promising class of materials for continuous sensing applications (e.g. air quality monitoring, detection of hazardous gases leaks) due to their low operating temperature and excellent selectivities, in comparison with the widely used metal oxides. However, they tend to be unstable at higher temperatures, which limits their response times and response values. Here, flame spray pyrolysis will be used to synthetize such materials and explore the changes with regards to the pristine nitrides for both sensing performance and thermal stability. - Chemical Engineering, Environmental Engineering, Interdisciplinary Engineering, Materials Engineering
- Bachelor Thesis, Master Thesis, Semester Project
| Metal nitrides have advantageous properties compared to metal oxides (better selectivities and lower operating temperatures) that show potential for applications such as continuous monitoring of hazardous gases and leakage detection. However, the sensing mechanism between the analyte and the surface of the metal nitride has not been investigated yet in literature. This project aims to shine some light on the surface interactions happening at the surface of metal nitrides while exposed to target analytes to uncover the sensing mechanism at hand. For that, metal nitride nanoparticles will be synthesized, characterized and their surface will be probed by specific gases using FTIR spectroscopy. - Environmental Technologies, Materials Engineering, Nanotechnology
- Bachelor Thesis, Semester Project
| In practice, most gas sensors created in a laboratory are not selective enough to be directly translated to the market. To overcome this, commercial systems typically require the use of filters (amongst other alternatives) to enhance the selectivity of the whole system. Catalytic filters are based on the chemical decomposition of the analyte when it enters in contact with the surface of the filter. The materials used so far as catalytic filters are mostly metal oxides, which typically require high temperatures to operate and therefore limit the transition to devices. Metal nitrides are another class of materials with interesting catalytic and electronic properties that could make them suitable as filters but have not been yet studied as such. This project will focus on the synthesis and testing of metal nitrides as filters. - Environmental Engineering, Materials Engineering, Nanotechnology
- Bachelor Thesis, Master Thesis, Semester Project, Summer School
| In this study, using a data-driven model, optimized geometries for patch shapes deposited using Wire-Arc Additive Manufacturing (WAAM) are identified. The primary objective is to minimize the stresses to prevent initiation of fatigue crack at the deposition root and to arrest crack in the steel plate. To achieve this, a collection of candidate geometries is generated using Rhinoceros soft-ware. Subsequently, the stress states corresponding to these geometries are determined using finite element (FE) ABAQUS software. FE simulations are scripted using Python codes. Using Element Birth Technique and inherent strain (IS) technique, deposited layers are added to the FE model and activated one by one to mimic the gradual build-up of strains caused by the deposition. The stress intensity factor driving the existing crack and stresses at the print root driving the initiation of a new crack are subsequently extracted from the simulation results. For this purpose, notch stress and critical distance approaches are integrated into the FE model. The simulation results are collected in a dataset and used to train a surrogate data-driven model to predict the fatigue performance of the deposited patch. - Mechanical Engineering, Printing Technology, Structural Engineering, Welding Technology
- Internship, Master Thesis, Semester Project
| Optimal steady-state operations are crucial for engineering systems. A promising paradigm called feedback optimization (FO) features autonomous optimality seeking with a minimal requirement on model information, i.e., the input-output sensitivity. In applications, however, uncertainties (e.g., random failures and parameter shifts) may cause a model mismatch, thus resulting in closed-loop sub-optimality. To address this critical issue, we will explore robustifying FO against structured model mismatch through regularization. To this end, we will formulate a min-max closed-loop optimization problem and solve the reformulated regularized problem in an online fashion. We will characterize the optimality and stability of the closed-loop behavior. Furthermore, we will numerically validate the effectiveness of the proposed algorithm. - Dynamical Systems, Electrical Engineering, Systems Theory and Control, Systems Theory and Control
- Bachelor Thesis, Master Thesis, Semester Project
| Develop and integrate a teleoperation setup for two dexterous, human-like robotic hand on robotic arms. Develop control strategies to solve real-world manipulation challenges with this system, to demonstrate the benefits of two-handed dexterous manipulation in mobile robotics. - Electrical Engineering, Interdisciplinary Engineering, Mechanical Engineering
- Bachelor Thesis, Master Thesis, Semester Project
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