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van Mierop, Ron (author)The considerable increase in the number of devices needing connectivity, such as mobile phones and Internet of Things (IoT) devices, has led to an exponential rise in data volumes during the last years, that will surely continue over the next decade. Therefore, it will be increasingly challenging to provide sufficient RF resources. A novel...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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- den Ouden, Bram (author) master thesis 2022
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Šiško, Josip (author), Tomić, Hrvoje (author), Gašparović, Sanja (author), Šiško, Darko (author)Spatial planning is at the core of every economic and social development of city. Key element in the process of spatial planning is information, that is traditionally a cadastre and land book. The change in property values has been considered as the result of the planning process, but in the last decade researches have seen a huge importance of...conference paper 2022
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Chen, Y. (author)There is increasing debate concerning citizen participation in the reuse and transformation of heritage sites. However, the question of why and how participatory approaches are explored in private-led heritage adaptive reuse receives limited attention. The paper shows why the communities should play an essential role in the adaptive reuse of...conference paper 2022
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Teo, Ying Shen (author), Jafari, Iman (author), Liang, Fei (author), Jung, Youmi (author), van der Hoek, J.P. (author), Ong, Say Leong (author), Hu, Jiangyong (author)The UV/Cl2 process (also known as chlorine photolysis, which is the combination of chlorine and simultaneous irradiation of UV light) is conventionally applied at acidic mediums for drinking water treatment and further treatment of wastewater effluents for secondary reuse. This is because the quantum yield of HO• from HOCl (ϕHO•, 254 = 1.4) is...journal article 2022
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van Driel, W.D. (author), Jacobs, B. (author), Watte, P. (author), Zhao, X. (author)Reliability is an essential scientific and technological domain intrinsically linked with system integration. Nowadays, semiconductor industries are confronted with ever-increasing design complexity, dramatically decreasing design margins, increasing chances for and consequences of failures, shortening of product development and qualification...journal article 2022
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Karimba, Benson Mutuma (author), Duker, Annelieke (author), Prasad, Pooja (author), Karimi, Poolad (author), de Fraiture, Charlotte (author), van der Zaag, P. (author)Irrigation is commonly viewed as an activity fixed in time and place requiring permanent infrastructure. However, smallholder farmers in Sub-Saharan Africa engage in irrigation in diverse locations under different organizational modalities. This research analyses a flexible and dynamic form of irrigation driven by unique partnerships between...journal article 2022
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Herzog, Alexander (author), Wagner, Max (author), Benkner, Simon (author), Zandi, Babak (author), van Driel, W.D. (author), Khanh, Tran Quoc (author)We report on the degradation dynamics and mechanisms of the commercially available chip-on-board (COB) high-power light-emitting diode (LED) modules with an electrical power of 175 W. Due to the associated thermal load, the temperature dependence of the aging processes is additionally analyzed within the scope of this work. The aging tests...journal article 2022
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Storm, S.T.H. (author)The concern that an economy could experience persistent stagnation, caused by a structural weakness of aggregate demand, goes back to Alvin Hansen's thesis of “secular stagnation.” Hansen's thesis has been revived in recent times, when it became clear that productivity and potential growth in the OECD countries have been declining for decades....book chapter 2022
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Benkner, Simon (author), Herzog, Alexander (author), Klir, Stefan (author), van Driel, W.D. (author), Khanh, Tran Quoc (author)The unique radiative, photometric and colorimetric characteristic of a light-emitting diode is derived from its spectral power distribution. Modeling such characteristics with respect to the forward current, temperature or operating time has been subject of various studies. Deriving a simple analytical model, however, is not trivial due to the...journal article 2022
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Chen, Wei (author), Chen, Ye (author), Cao, Yixing (author), Cui, Z. (author), Fan, Xuejun (author), Zhang, Kouchi (author), Fan, J. (author)In a light-emitting diode (LED) package, silicone encapsulant serves as a chip protector and enables the light to transmit, since it exhibits the advantages of high light transmittance, high refractive index, and high thermal stability. However, its reliability is still challenged under harsh operation conditions. In this study, the optical...journal article 2022
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Duker, Annelieke E.C. (author), Karimba, Benson Mutuma (author), Wani, Grace E. (author), Prasad, Pooja (author), van der Zaag, P. (author), De Fraiture, Charlotte (author)In the semi-arid lands of southern Kenya, a dynamic process of farmer-led irrigation has developed over the past two decades. It is characterised by short-term agreements to access land and water. Resident and migrant farmers, capital providers and local landowners have engaged in diverse partnerships to benefit from water and land along the...journal article 2022
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Feng, Shuo (author), Jiang, Tao (author), Chen, Wei (author), Fan, Xuejun (author), Zhang, Kouchi (author), Fan, Jiajie (author)As a core packaging material of light color conversion, phosphor/silicone composite plays an indispensable role in light emitting diode (LED) packaging. At present, commercial LED packages mainly use blue LED chips to stimulate Yttrium Aluminum Garnet (YAG) yellow phosphor to reach a white color. However, (Ca,Sr)AlSiN 3 :Eu 2+ (CSASN) red...conference paper 2022
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Lu, Zhiwei (author), Li, Xiaoling (author), Wei, Jinxiu (author), Cai, Miao (author), Yang, Daoguo (author), Zhang, Kouchi (author)UVC-LED is known as a deep ultraviolet LED. The application development and disinfection efficiency of UVC-LED modules are important problems encountered when UVC-LED products are rushed into commercialization. In this article, a specific disinfection experiment with a UVC-LED module was combined to analyze the disinfection efficiency. UVC-LEDs...conference paper 2022
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Ji, Liangzheng (author), Zhang, Kouchi (author), Zhang, Jing (author), Liu, Pan (author)Micro LED display technology has been spotlighted as the most promising technology compared to LCD and OLED. Its excellent advantages include higher brightness, self-illumination, higher resolution, lower power consumption, faster response, higher integration, higher stability, thinner thickness, longer life, etc. In terms of the unique benefits...conference paper 2022
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Purwanto, A. (author)Governmental organizations are increasingly making non-privacy-restricted and non-confidential data publicly available on the internet that anyone can freely use, reuse, and distribute without any restrictions. The opening up the government data enables citizens to engage with OGD, i.e., to collaboratively convert OGD into valuable artifacts...doctoral thesis 2021
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Wymenga, Luutzen (author)Heart Failure (HF) is a disease of high mortality and morbidity with huge impact on health care systems worldwide. HF is a result of decreased contraction of the heart muscle. Current treatments focus on symptoms,and only a minor portion of HF patients is eligible for surgery. Assistance devices for cardiac contractionare currently only...master thesis 2021
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Krishnaswamy, Medha (author)Optogenetics is a neuromodulation technique that uses light to control genetically modified cells to express light sensitive ion channels. Optogenetics allows stimulation of only the specific cells in the region that have been genetically modified and thus results in a high resolution of stimulation.<br/>Currently optogenetic implants are used...master thesis 2021
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Xu, Xinyun (author)Since the outbreak of SARS-COV-2, various virus inactivation techniques have been applied to suppress the spread of virus. Ultraviolet exposure inactivation is an efficient approach to inactivate virus, within UV band, UV-C with comparatively higher energy. UV-C has been proved to inactivate viruses efficiently, while to figure out efficient...master thesis 2021