Searched for: subject:"Degradation"
(21 - 40 of 79)

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van Driel, B.A. (author), van den Berg, K. J. (author), Smout, M. (author), Dekker, N. (author), Kooyman, P.J. (author), Dik, J. (author)
This study reports on the effect of artists’ paint formulation on degradation rates of TiO2-based oil paints. Titanium white oil paint exists in a multitude of different recipes, and the effect of the formulation on photocatalytic binder<br/>degradation kinetics is unknown. These formulations contain, among others, one or both titanium dioxide...
journal article 2018
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van Driel, W.D. (author), Beijer, J.G.J. (author), Bikker, J.W. (author), van Blokland, C.H.M. (author), Ankomah, C. (author), Jacobs, B. (author)
We have seen an increasing number of reported colour maintenance issues in the market when it concerns LED-based products. Besides this, there are also requests to provide products that have &lt; 2 SDCM colour point changes over lifetime. To understand the mechanisms behind colour maintenance in our LED-portfolio we have developed a...
conference paper 2018
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Yazdan Mehr, M. (author), van Driel, W.D. (author), De Buyl, Francois (author), Zhang, G.Q. (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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Jacobs, B. (author), van Driel, W.D. (author), Schuld, M. (author)
Commercial claims for LED-based products in terms of lumen maintenance are fully based on TM-21 extrapolations using LM-80 data. We presented an approach based on statistical data analytics, following the work from Yu &amp; Tseng, at EuroSimE2015. Since then, more LM80 test data came available both for High Power (HP) and Mid Power (MP) LEDs....
conference paper 2018
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Liu, C. (author), Cheng, Gang (author), Chen, Xihui (author), Pang, Y. (author)
Given local weak feature information, a novel feature extraction and fault diagnosis method for planetary gears based on variational mode decomposition (VMD), singular value decomposition (SVD), and convolutional neural network (CNN) is proposed. VMD was used to decompose the original vibration signal to mode components. The mode matrix was...
journal article 2018
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Wang, H. (author), Silvast, Mika (author), Markine, V.L. (author), Wiljanen, Bruce (author)
Transition zones in railway tracks are the locations with considerable changes in vertical support structures, e.g., near bridges. Due to possible water flow constrictions in transition zone structures, there is frequently an increased moisture level in the ballast/subballast layers, which is a potential source of track degradation. This paper...
journal article 2017
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Smit, H. (author), Muche, Rahel (author), Ahlers, Rhodante (author), van der Zaag, P. (author)
To understand why soil erosion is persistent despite three decades of massive investments in soil conservation, this paper explores how drainage and soil conservation change a hill slope in the Choke Mountains. By paying close attention to the practices that reshape the hill, we account for the active roles of people and material flows in...
journal article 2017
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Wei, Z. (author), Nunez Vicencio, A.A. (author), Li, Z. (author), Dollevoet, R.P.B.J. (author)
In this paper, we investigate the capability of an axle box acceleration (ABA) system to evaluate the degradation at railway crossings. For this purpose, information from multiple sensors, namely, ABA signals, 3D rail profiles, Global Positioning System (GPS) and tachometer recordings, was collected from both nominal and degraded crossings....
journal article 2017
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Lu, G. (author)
Luminous flux maintenance and color stability are two important factors to evaluate the lighting quality. Where a significant amount of research efforts are performed on the former and even some standards have been generated for lumen decay acceleration, research activities and achievements on the latter are lagging behind. DOE Energy Star...
doctoral thesis 2017
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Barcelos Carneiro M Da R, I. (author), Raijmaekers, S (author), Nijssen, RPL (author), van der Meer, F.P. (author), Sluijs, L.J. (author)
In this work, a glass/epoxy material system applied in wind turbine blades was used to evaluate degradation processes induced by water ingression. Composite and neat epoxy specimens were conditioned in demineralised water at 50 °C for 4800 h and tested quasi-statically and in fatigue. Comparing results from mechanical tests in composite...
journal article 2017
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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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Sun, B. (author), Fan, Xuejun (author), Ye, H. (author), Fan, Jiajie (author), Qian, Cheng (author), van Driel, W.D. (author), Zhang, G.Q. (author)
In this paper, an integrated LED lamp with an electrolytic capacitor-free driver is considered to study the coupling effects of both LED and driver's degradations on lamp's lifetime. An electrolytic capacitor-less buck-boost driver is used. The physics of failure (PoF) based electronic thermal simulation is carried out to simulate the lamp's...
journal article 2017
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Cai, Miao (author), Yang, Daoguo (author), Huang, J. (author), Zhang, Maofen (author), Chen, Xianping (author), Liang, Caihang (author), Koh, S.W. (author), Zhang, G.Q. (author)
The color coordinate shift of light-emitting diode (LED) lamps is investigated by running three stress-loaded testing methods, namely step-up stress accelerated degradation testing, step-down stress accelerated degradation testing, and constant stress accelerated degradation testing. A power model is proposed as the statistical model of the...
journal article 2017
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Bronikowski, Agathe (author), Hagedoorn, P.L. (author), Koschorreck, Katja (author), Urlacher, Vlada B. (author)
Laccases have gained significant attention due to their emerging applications including bioremediation, biomass degradation and biofuel cells. One of the prerequisites for the industrial application of laccases is their sufficient availability. However, expression levels of recombinantly expressed laccases are often low. In this study Mrl2, a...
journal article 2017
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van Driel, B.A. (author), Wezendonk, T.A. (author), van den Berg, K. J. (author), Kooyman, P.J. (author), Gascon, Jorge (author), Dik, J. (author)
Titanium white (TiO<sub>2</sub>) has been widely used as a pigment in the 20th century. However, its most photocatalytic form (anatase) can cause severe degradation of the oil paint in which it is contained. UV light initiates TiO<sub>2</sub>-photocatalyzed processes in the paint film, degrading the oil binder into volatile components...
journal article 2017
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Qi, Jingxian (author), Paul, C.E. (author), Hollmann, F. (author), Tischler, Dirk (author)
The oxygen-insensitive azoreductase AzoRo originating from Rhodococcus opacus 1CP was found to be most active at low pH (ca. 4) and high temperature (ca. 50 °C). AzoRo is not an efficient biocatalyst when used at low pH due to stability problems. To overcome this issue, we discovered that AzoRo accepts an alternative electron donor, 1-benzyl...
journal article 2017
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Morsch, Suzanne (author), van Driel, B.A. (author), van den Berg, Klaas Jan (author), Dik, J. (author)
As linseed oil has a longstanding and continuing history of use as a binder in artistic paints, developing an understanding of its degradation mechanism is critical to conservation efforts. At present, little can be done to detect the early stages of oil paint deterioration due to the complex chemical composition of degrading paints. In this...
journal article 2017
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Naddaf Dezfuli, S. (author), Huan, Z. (author), Mol, J.M.C. (author), Leeflang, M.A. (author), Chang, Jiang (author), Zhou, J. (author)
The present research was aimed at developing magnesium-matrix composites that could allow effective control over their physiochemical and mechanical responses when in contact with physiological solutions. A biodegradable, bioactive ceramic - bredigite was chosen as the reinforcing phase in the composites, based on the hypothesis that the...
journal article 2017
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de Bruin, T.D. (author), Verbert, K.A.J. (author), Babuska, R. (author)
Timely detection and identification of faults in railway track circuits are crucial for the safety and availability of railway networks. In this paper, the use of the long-short-term memory (LSTM) recurrent neural network is proposed to accomplish these tasks based on the commonly available measurement signals. By considering the signals from...
journal article 2017
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Vasudevan, R.A. (author), Poli, Isabella (author), Deligiannis, D. (author), Zeman, M. (author), Smets, A.H.M. (author)
Light-induced effects on the minority carrier lifetime of silicon heterojunction structures are studied through multiple-exposure photoconductance decay (MEPCD). MEPCD monitors the effect of the measurement flash from a photoconductance decay setup on a sample over thousands of measurements. Varying the microstructure of the intrinsic...
journal article 2016
Searched for: subject:"Degradation"
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