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Cunico, G. (author), Deuten, S. (author), Huang, I. (author)As a concept challenging the growth paradigm, degrowth is put into practice in different ways. Ones of which are degrowth-oriented cooperatives: organisations composed of producers and consumers that intend to keep a locally oriented focus and embrace more responsible economic practices to promote socio-ecological sustainability. Despite their...article 2022
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Hogervorst, M.A. (author), de Kok, M.M. (author)Within the EDA funded project ACAMSII, "Adaptive camouflage for the soldier", a future soldier system is being developed and implemented that provides adaptive camouflage against all relevant sensor threats, ranging from visible to thermal and radar. To provide adaptive camouflage in the visible domain LEDs are integrated in the clothing. A...conference paper 2021
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Hermus, M.A.A. (author), Boesveld, I.C. (author), Hitzert, M. (author), Franx, A. (author), de Graaf, J.P. (author), Steegers, E.A.P. (author), Wiegers, T.A. (author), van der Pal-de Bruin, K.M. (author)Background: During the last decade, a rapid increase of birth locations for low-risk births, other than conventional obstetric units, has been seen in the Netherlands. Internationally some of such locations are called birth centres. The varying international definitions for birth centres are not directly applicable for use within the Dutch...article 2017
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Hermus, M.A.A. (author), Hitzert, M. (author), Boesveld, I.I. (author), van den Akker-van Marle, E.M. (author), van Dommelen, P. (author), Franx, A. (author), de Graaf, J.P. (author), van Lith, J.M.M. (author), Steegers, E.E. (author), Wiegers, T.A. (author), van der Pal-de Bruin, K.K. (author)Objectives To compare the Optimality Index of planned birth in a birth centre with planned birth in a hospital and planned home birth for low-risk term pregnant women who start labour under the responsibility of a community midwife. Design Prospective cohort study. Setting Low-risk pregnant women under care of a community midwife and living in a...article 2017
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Dzhongova, E. (author), Anderson, D. (author), de Ruiter, J. (author), Novakovic, V. (author), Ruiz Oses, M. (author)Restrictions on the carriage of liquids, aerosol, and gels (LAGs) by airline passengers have been in place since November 2006, following the discovery of a terrorist plot involving homemade liquid explosives to be used on transatlantic flights (Wikipedia, 2006). Restrictions on the carriage of LAGs remain today, and the operational impact of...article 2017
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Perpiñà, X. (author), Werkhoven, R.J. (author), Vellvehi, M. (author), Jakovenko, J. (author), Jordà, X. (author), Kunen, J.M.G. (author), Bancken, P. (author), Bolt, P.J. (author)This paper studies the thermal influence of a light-emitting diode (LED) driver on a retrofit LED lamp, also reporting on a procedure for its thermal characterization and multiscale modeling. In this analysis, temperature is measured by infrared thermography and monitoring specific locations with thermocouples. Experimental results point out...article 2015
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Ohmea, H. (author), Tomita, Y. (author), Kashara, M. (author), Schram, J. (author), Smits, E.C.P. (author), van den Brand, J. (author), Bossuyt, F. (author), Vanfleteren, J. (author), de Baets, J. (author)We present a stretchable and foldable passive matrix driven display using 45 by 80 RGB LED’s mounted on a meandering printed circuitry embedded in a polyurethane film. The meander interconnections have been optimized with respect to their electrical and mechanical properties to provide a display with a 3 mm pitch between the pixels and a...conference paper 2015
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Altazin, S. (author), Reynaud, C. (author), Mayer, U.M. (author), Lanz, T. (author), Lapagna, K. (author), Knaack, R. (author), Peninck, L. (author), Kirsch, C. (author), Pernstich, K.P. (author), Harkema, S. (author), Hermes, D. (author), Ruhstaller, B. (author)A multi-scale optical model for organic light-emitting devices containing scattering layers is presented. This model describes the radiation of embedded oscillating dipoles and scattering from spherical particles. After successful model validation with experiments on a top-emitting white OLED, we show how this tool can be used for optimization...article 2015
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Abbaszadeh, D. (author), Nicolai, H.T. (author), Crəciun, N.I. (author), Blom, P.W.M. (author)The operation of blue light-emitting diodes based on polyspirobifluorene with a varying number of N,N,N′,N′ tetraaryldiamino biphenyl (TAD) hole-transport units (HTUs) is investigated. Assuming that the electron transport is not affected by the incorporation of TAD units, model calculations predict that a concentration of 5% HTU leads to an...article 2014
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Ye, H. (author), Koh, S.W. (author), Yuan, C. (author), van Zeijl, H. (author), Gielen, A.W.J. (author), Lee, S.W.R. (author), Zhang, G. (author)The drive of increased electrical currents to achieve high luminous output for phosphor-converted white light-emitting diodes (PW-LED) has led to a series of thermal problems. The light performance of PW-LED is affected by the heat generated by the two major sources in a package/module: chip(s) and phosphors. In this work, spectral shift and...article 2014
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Abbaszadeh, D. (author), Wetzelaer, G.A.H. (author), Nicolai, H.T. (author), Blom, P.W.M. (author)The quenching of excitons at the poly(3,4-ethylenedioxythiophene):poly(styrenesulfonic acid) PEDOT:PSS) anode in blue polyalkoxyspirobifluorene-arylamine polymer light-emitting diodes is investigated. Due to the combination of a higher electron mobility and the presence of electron traps, the recombination zone shifts from the cathode to the...article 2014
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den Hengst-Bruggeling, M. (author), de Graaf, H.A.L.M. (author), van Scheepstal, P.G.M. (author)lntelligence-led policing is a concept of policing that has been applied throughout the world. Despite some encouraging reports, the effect of intelligence-led policing is largely unknown. This paper presents a method with which it is possible to identify intelligence-led policing's potential to increase the effectiveness of policing. The method...article 2014
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Ye, H. (author), Sokolovskij, R. (author), van Zeijl, H.W. (author), Gielen, A.W.J. (author), Zhang, G. (author)Solid State Lighting (SSL) systems, powered by light-emitting diodes (LEDs), are revolutionizing the lighting industry with energy saving and enhanced performance compared to traditional light sources. However, around 70%-80% of the electric power will still be transferred to heat. As the elevated temperature negatively affects the maximum...article 2014
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Ye, H. (author), Mihailovic, M. (author), Wong, C.K.Y. (author), van Zeijl, H.W. (author), Gielen, A.W.J. (author), Zhang, G.Q. (author), Sarro, P.M. (author)High Power Light Emitting Diode (HP LED) is one of the promising candidates for future lighting systems with efficient energy consumption. However, around 70% of the input power will be still transferred to heat. Recently, to obtain more light output, the increased electrical currents consequently cause more significant heat. To solve the...article 2013
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Vellvehi, M. (author), Perpina, X. (author), Jorda, X. (author), Werkhoven, R.J. (author), Kunen, J.M.G. (author), Jakovenko, J. (author), Bancken, P. (author), Bolt, P.J. (author)This work deals with the extraction of key thermal parameters for accurate thermal modelling of LED lamps: air exchange coefficient around the lamp, emissivity and thermal conductivity of all lamp parts. As a case study, an 8W retrofit lamp is presented. To assess simulation results, temperature is monitored on the lamp by infrared thermography...conference paper 2013
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Kloosterman, J. (author), Kregting, R. (author), Erinc, M. (author), van Driel, W.D. (author)Lighting is an advancing phenomenon both on the technology and on the market level due to the rapid development of the solid-state lighting technology. The interest in solder joint reliability has increased by the introduction of the so-called high brightness leadless type of packages. Solder joint reliability is one of the main failure modes in...bookPart 2013
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Ye, H. (author), Chen, X. (author), van Zeijl, H. (author), Gielen, A.W.J. (author), Zhang, G. (author)The diode forward voltage method with pulsed currents was widely used for monitoring junction temperature (Tj of light-emitting diodes (LEDs). However, a thermal transient effect (TTE) was observed by the pulsed currents and consequent errors were introduced. Thermoelectric physics was conducted to explain this phenomena and a group of...article 2013
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van Driel, W.D. (author), Evertz, F.E. (author), Zaal, J.J.M. (author), Morales Nápoles, O. (author), Yuan, C.A. (author)Solid-State Lighting (SSL) applications are slowly but gradually pervading into our daily life. An SSL system is composed of an light-emitting diode (LED) engine with a microelectronic driver(s) in a housing that also supplies the optic design. Knowledge of system-level reliability is crucial for the business success of future SSL systems, and...bookPart 2013
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Koh, S. (author), van Driel, W.D. (author), Yuan, C.A. (author), Zhang, G.Q. (author)Lumen depreciation is one of the major failure modes in light-emitting diode (LED) systems. It originated from the degradation of the different components within the package, being the LED device or chip, the driver, and the optical materials (including phosphorous layer). This chapter describes the state of the art of the degradation mechanism...bookPart 2013
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de Bruyn, P. (author), Moet, D.J.D. (author), Blom, P.W.M. (author)We present an all-solution processed polymer light-emitting diode (PLED) using spincoated zinc oxide (ZnO) and vanadium pentoxide (V2O5) as electron and hole injecting contact, respectively. We compare the performance of these devices to the standard PLED design using PEDOT:PSS as anode and Ba/Al as cathode. We show that the all-solution...article 2012
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