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Wen, Minzhen (author), Ibrahim, Mesfin Seid (author), Meda, Abdulmelik Husen (author), Zhang, Kouchi (author), Fan, J. (author)High-power white light-emitting diodes (LEDs) have demonstrated superior efficiency and reliability compared to traditional white light sources. However, ensuring maximum performance for a prolonged lifetime use presents a significant challenge for manufacturers and end users, especially in safety–critical applications. Thus, identifying...journal article 2024
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Rocchetta, Roberto (author), Zhan, Zhouzhao (author), van Driel, W.D. (author), Di Bucchianico, Alessandro (author)Lifetime analyses are crucial for ensuring the durability of new Light-emitting Diodes (LEDs) and uncertainty quantification (UQ) is necessary to quantify a lack of usable failure and degradation data. This work presents a new framework for predicting the lifetime of LEDs in terms of lumen maintenance, effectively quantifying the natural...journal article 2024
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Epema, Jelle (author)This study examines the validity of constant failure rates in the reliability assessment of storm surge barriers, with a focus on the Stormvloedkering Oosterschelde (SVKO). Analysing a dataset of 1,501 malfunctions, including 87 critical incidents over six years, we employ Exponential and Weibull statistical models to assess failure rates. The...master thesis 2023
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van Ammers, Jeroen (author)Submodules are the building blocks for MMC-type HVDC converters and therefore of utmost importance for converter reliability. In order to unlock smarter maintenance strategies for submodule semiconductors, the technical condition of the semiconductors needs to be estimated to form a health index. Besides the non-project-specific traditional...master thesis 2023
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Ikeda, Yukiko (author)Current cravings for more are taking a great toll on the Earth and its most vulnerable communities. The rise in ’fast furniture’ has contributed to this issue, popularizing the idea that furniture can be cheap, to the point of being disposable. To understand the size of this issue and how much more damage to the environment might be in store if...master thesis 2023
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Bhadury, Abheek (author)There will soon be a huge influx of EV chargers required in the coming years. Therefore it is important to find out the lifetime of EV chargers like the DC Fast Charger for business cases. These chargers are a combination of multiple power converters to help regulate the grid AC voltage to something that can be used to charge the battery....master thesis 2023
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Postma, Marijn (author)The urgent need for marine transportation to reduce CO2 emissions has led to considering alternative energy and storage sources. The resulting increase in the complexity of powerplant architectures led to the development of advanced control strategies to achieve energy savings. At the same time, the health status of components has been often...master thesis 2023
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Wu, Chun-Yen (author)The increasing focus on sustainable living and the need to reduce dependency on fossil fuels has led to a growing interest in renewable energy sources. Among these, the wind energy sector has not only experienced significant growth in terms of numbers but also in size. Larger turbines lead to more severe leading-edge erosion and further increase...master thesis 2023
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Hazenbroek, Marie-Claire (author)People with Down Syndrome are growing older but, at the same time, are still disconnected from the world. Their needs change as they age, which is researched in this thesis. Can the design of their living environment simplify their daily activities? Guidelines are conducted from different fieldwork observations and interviews in which multiple...master thesis 2023
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Hoogland, Maxime (author)CO2 electrolysis to form CO with the use of electricity from renewable sources is a promising technique in closing the carbon cycle. Via the electrochemical reduction CO2 can be converted into different hydrocarbon products. These value-added products are for example CO, HCOOH, CH3OH or C2H4. The direct electrochemical route of CO2 reduction is...master thesis 2023
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van Herwerden, Thijs (author)Fiber reinforced composites have been increasingly used in the aerospace and automotive industry, due to their potential advantages for designing flexible, strong and lightweight structures. More recently they are also being considered for the manufacturing of marine propellers. Since they have the potential to lower the weight, lower the...master thesis 2023
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Schürmann, Femke (author)The integration of large-scale battery storage systems can aid the transition to renewable energy and stabilize energy systems for optimization. However, batteries can be cost-prohibitive and unprofitable, highlighting the need for a more comprehensive understanding and modelling of battery degradation. Battery degradation prediction models play...master thesis 2023
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Herzog, Alexander (author), Benkner, Simon (author), Zandi, Babak (author), Buffolo, Matteo (author), van Driel, W.D. (author), Meneghini, Matteo (author), Khanh, Tran Quoc (author)We report on the degradation mechanisms and dynamics of silicone encapsulated ultraviolet A (UV-A) high-power light-emitting diodes (LEDs), with a peak wavelength of 365nm. The stress tests were carried out for a period of 8665 hours with forward currents between 350mA and 700mA and junction temperatures up to 132°C. Depending on stress...journal article 2023
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Bleeker, J.J. (author), Kahn, A.P. (author), Baumgartner, L.M. (author), Grozema, F.C. (author), Vermaas, D.A. (author), Jager, W.F. (author)Spatiotemporal pH imaging using fluorescence lifetime imaging microscopy (FLIM) is an excellent technique for investigating dynamic (electro)chemical processes. However, probes that are responsive at high pH values are not available. Here, we describe the development and application of dedicated pH probes based on the 1-methyl-7-amino...journal article 2023
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van den Berge, R.B.R. (author), Magnier, L.B.M. (author), Mugge, R. (author)Modularity represents a promising design strategy for product lifetime extension. Yet, the fact that products are physically designed to be repaired via such a modular design, does not mean consumers will act accordingly. Past research demonstrated promising results with current modular smartphone users. However, these users may not necessarily...conference paper 2023
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En-nadir, Redouane (author), Basyooni, Mohamed A. (author), Tihtih, Mohammed (author), Belaid, Walid (author), Ez-zejjari, Ilyass (author), Majda, El Ghmari Majda (author), El Ghazi, Haddou (author), Ahmed, Salim (author), Zorkani, Izeddine (author)Ultra-thin quantum wells, with their unique charge confinement effects, are essential in enhancing the electronic and optical properties crucial for optoelectronic device optimization. This study focuses on theoretical investigations into radiative recombination lifetimes in nanostructures, specifically addressing both intra-subband (ISB: e-e)...journal article 2023
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Kardan Halvaei, F. (author), Shekhar, A. (author), Bauer, P. (author)EV fast chargers are essential in addressing the concern of limited driving range for E-mobility applications. However, the load profile of a converter for fast charging involves a high-current pulse that can last for a few minutes to efficiently replenish the EV battery, which is followed by a cooldown period after the charging process is...conference paper 2023
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Kardan Halvaei, F. (author), Ahmadi, M. (author), Shekhar, A. (author), Bauer, P. (author)EV Fast chargers are crucial to alleviate the driving range anxiety for E-mobility applications. A typical converter load profile consists of a short high-current pulse to rapidly refill the EV battery followed by a cooling-off period once the charging is completed. Power electronic components experience thermal cycles as a result, which can...conference paper 2023
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Kardan Halvaei, F. (author), Shekhar, A. (author), Bauer, P. (author)The load profile of the power converter in EV Fast charging applications involves a short high-current pulse for rapid charging of the EV battery leading to thermal cycles on the power electronic devices. These thermal cycles can cause thermo-mechanical fatigues, which consume the power devices’ lifetime. Also, different timescales and magnitude...conference paper 2023
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Molenaar, M. (author), Kardan Halvaei, F. (author), Shekhar, A. (author), Bauer, P. (author)The reliability of semiconductor power devices can be studied by performing a thermal and power cycling test. In order to create the desired temperature cycles, there are four free variables to select during the power cycling test, namely the heating current, heating time, cooling time, and heatsink temperature. In this paper, the relation...conference paper 2023