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Henzel, J. (author), Bakker, N.J. (author), Najafi, Mehrdad (author), Zardetto, Valerio (author), Veenstra, Sjoerd (author), Isabella, O. (author), Mazzarella, L. (author), Weeber, A.W. (author), Theelen, Mirjam (author)Nonequal current generation in the cells of a photovoltaic module, e.g., due to partial shading, leads to operation in reverse bias. This quickly causes a significant efficiency loss in perovskite solar cells. We report a more quantitative investigation of the reverse bias degradation. Various small reverse biases (negative voltages) were...journal article 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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Vermeer, W.W.M. (author), Chandra Mouli, G.R. (author), Bauer, P. (author)Battery aging is one of the critical problems to be tackled in battery research, as it limits the power and energy capacity during the battery's life. Therefore, optimizing the design of battery systems requires a good understanding of aging behavior. Due to their simplicity, empirical and semiempirical models (EMs) are frequently used in...journal article 2022
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Ren, Jie (author), Zhang, Lihai (author), Zhu, Yingcan (author), Li, Z. (author), San Nicolas, Rackel (author)This study compares the degradation behavior of the alkali-activated slag/fly ash (AASF) and ordinary Portland cement (OPC) mortars exposed to phosphoric acid with different pH values. The experimental results show that AASF mortars exhibit better resistance than OPC mortars against surface damage, although both systems get white deposits on the...journal article 2022
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Jiang, Jing (author), Wang, S. (author), Liu, X. (author), Liu, Jianhui (author), Li, Jun (author), Zhou, Dexiang (author), Zhang, Kouchi (author), Ye, H. (author), Tan, C. (author)High electric-field stress is an effective solution to the recovery of irradiated devices. In this paper, the dependence of the recovery level on the magnitude of gate voltage and duration is investigated. Compared with the scheme of high gate-bias voltage with a short stress time, the transfer characteristics are significantly recovered by...journal article 2022
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Yang, Liu (author), Ma, Yunjian (author), Chen, Yebao (author), Hollmann, F. (author), Wang, Yonghua (author)Phthalic acid esters (PAEs) are widely used as plastic additives to increase the flexibility and durability of plastics. Constantly leaching out from plastics, PAEs are ubiquitously found in the environment. As PAEs exhibit biological activities such as being endocrine disruptive, the quest for efficient degradation strategies continues. Here...journal article 2022
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Fazzi, L. (author), Dias, Nuno (author), Holynska, Malgorzata (author), Tighe, Adrian (author), Rampini, Riccardo (author), Groves, R.M. (author)In this research the ageing of a silicone adhesive in a simulated space environment is monitored through an embedded three parameter tilted fibre Bragg grating (TFBG) sensor. Here, the silicone is used as an adhesive between two thin cover glasses, and the space environmental ageing is simulated by thermal cycles in high vacuum conditions ...journal article 2022
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Makris, K. (author), Langeveld, J.G. (author), Clemens, F.H.L.R. (author)Polyvinyl chloride (PVC) sewer pipes have operated for decades in a hostile environment, raising concern among sewer managers over the longevity of their drainage systems. Inspection data (CCTV and Panoramo®) reveals that severe defects have already surfaced, yet it is unknown if the material properties of PVC sewers have been affected. In...journal article 2021
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Ylla Arbos, C. (author), Blom, A. (author), Acevedo Goldaracena, F. (author), van Vuren, S (author), Schielen, R.M.J. (author)The Rhine reach comprising the Niederrhein and the Upper Rhine Delta is characterized by a long history of engineering interventions. The area is densely populated and the Rhine, the main inland waterway in Europe, justifying the need for such measures. Interventions have had a strong impact on morphodynamic channel characteristics. We use bed...conference paper 2020
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Gusain, D. (author), Cvetkovic, M. (author), Bentvelsen, Ron (author), Palensky, P. (author)To counter the inherent intermittent and unpre dictable power generation from large amounts of wind and solar, fast-acting resources are required, one of the options being sector coupling via power to gas devices. Industrial Power to Gas (IPtG) resources, such as an electrolyzer, represent an attractive solution to satisfy the rising energy...conference paper 2020
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Makris, K. (author), Langeveld, J.G. (author), Clemens, F.H.L.R. (author)Polyvinyl chloride (PVC) has become one of the dominant construction materials for sewer systems over the past decades, as a result of its reputed merits. However, since PVC sewer pipes have operated for decades in a hostile environment, concern over their longevity has been lately raised by sewer managers in the Netherlands. Towards that...journal article 2019
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Cai, Miao (author), Liang, Yonghu (author), Yun, Minghui (author), Chen, Xuan-You (author), Yan, Haidong (author), Yu, Zhaozhe (author), Yang, Daoguo (author), Zhang, Kouchi (author)A novel silicone rubber elastic key (SREK) is proposed in this paper for surface mounting technology (SMT) applications. Effects of thermal reflowing stress on the mechanical properties of SMT-SREKs are investigated. The manufactured SMT-SREKs, which underwent various reflowing conditions in advance, are subjected to pressing force and...journal article 2019
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Naddaf Dezfuli, S. (author)When a bone is fractured, it loses its structural integrity which makes it unable to bear any mechanical load. Therefore, a broken bone must be supported until it regains its strength to handle the body's movement and weight. A surgical procedure is needed to set a fractured bone. This procedure often involves repositioning the bone fragments...doctoral thesis 2018
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Yazdan Mehr, M. (author), van Driel, W.D. (author), De Buyl, Francois (author), Zhang, Kouchi (author)Degradation mechanisms of silicone plates under harsh environment conditions are studied in this investigation. Environmental degradation of silicone free form, used as secondary optics in Light Emitting Diode LED lighting lamps and luminaires or any other applications requiring high quality optics being used, has negative implications for the...journal article 2018
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Rogova, E.S. (author)Reliability of transport equipment plays a crucial role in providing safety for passengers. Safety systems of transport equipment perform safety functions with assigned safety integrity levels (SIL). If the reliability of a safety system is not sufficient, it has to be improved till the required level. This can be done by improving maintenance,...doctoral thesis 2017
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Stanic, N. (author), Langeveld, J.G. (author), Salet, Theo (author), Clemens, F.H.L.R. (author)Drill core samples are taken in practice for an analysis of the material characteristics of concrete pipes in order to improve the quality of the decision-making on rehabilitation actions. Earlier research has demonstrated that core sampling is associated with a significant uncertainty. In this paper, the results of core samples are compared...journal article 2016
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Gard, W.F. (author), Van de Kuilen, J.W.G. (author), Cabrera de Diego, M. (author)Hydraulic timber structures such as mooring poles, fenders, lock gates and jetties are widely-used in inner and sea harbours all over the world. In general these structures give satisfactory performance with regard to the technical requirements. Because of the harsh exposure conditions such as brackish and contaminated water, drying-out,...conference paper 2014
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- Veerman, R.P. (author), Koenders, E.A.B. (author) conference paper 2013
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Heinemann, H.A. (author)Concrete like materials were already applied during the Roman Empire. After the decline of the Roman Empire, a wide scale application of concrete only reappeared in the 19th century. Here lies also the origin of modern (reinforced) concrete. Since then, both concrete application and composition have significantly changed. Today, concrete from...doctoral thesis 2013
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Klaver, A. (author)Solar cells are the prime power supply for satellites in space. Space is, however, a hostile environment for electronic devices, such as solar cells: in space the devices are subjected to large temperature cycles, atomic oxygen, space dust, meteorites, and high-energy charged-particle irradiation. In this thesis we present the development of a...doctoral thesis 2007
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