Searched for: author:"Yazdan Mehr, M."
(1 - 9 of 9)
document
Bahrami, A. (author), Yazdan Mehr, M. (author)
Isothermal ageing of Al–Mg–Si alloys, stored at room temperature for more than 5 months, is associated with an unexpected significant increase in the overall electrical resistivity. This unexpected anomalous increase is not observed in alloys with shorter storage (natural ageing) times. This phenomenon is explained with a scenario, based on...
journal article 2019
document
Kiani Khouzani, M. (author), Bahrami, A. (author), Yazdan Mehr, M. (author)
This paper aims at studying microstructure and mechanical properties of spark plasma sintered (SPSed) Stellite®-6 cobalt-based superalloy. SPS is a sintering technique, based on a relatively fast resistance heating using a pulsed current. Fast sintering process, associated with minimum grain growth, results in excellent mechanical properties....
journal article 2019
document
Yazdan Mehr, M. (author), Bahrami, A. (author), van Driel, W.D. (author), Fan, Xuejun (author), Davis, J.L. (author), Zhang, G.Q. (author)
In this paper, degradation mechanisms of optical materials, used in the light emitting diode (LED)-based products, are reviewed. The LED lighting is one of the fastest technology shifts in human history. Lighting accounts for almost 20% of the global electrical energy use, inferring that replacement of traditional lighting sources with LEDs...
journal article 2019
document
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
document
Yazdan Mehr, M. (author), Vollebregt, S. (author), van Driel, W.D. (author), Zhang, G.Q. (author)
A graphene monolayer has been successfully coated on one side of a bisphenol-A-polycarbonate (BPA-PC) plate, used as a substrate for remote phosphor applications in light-emitting diode (LED)-based products. Using a photoresist transferring method, graphene sheet has been coated on BPA-PC plates. The results show that this graphene monolayer...
journal article 2017
document
Yazdan Mehr, M. (author)
In this thesis the degradation and failure mechanisms of organic materials in the optical part of LED-based products are studied. The main causes of discoloration of substrate/lens in remote phosphor of LED-based products are also comprehensively investigated. Solid State Lighting (SSL) technology is a new technology based on light emitting...
doctoral thesis 2015
document
Yazdan Mehr, M. (author), Van Driel, W.D. (author), Zhang, G.Q. (author)
A methodology, based on accelerated degradation testing, is developed to predict the lifetime of remote phosphor plates used in solid-state lighting (SSL) applications. Both thermal stress and light intensity are used to accelerate degradation reaction in remote phosphor plates. A reliability model, based on the Eyring relationship, is also...
journal article 2015
document
Yazdan Mehr, M. (author), van Driel, W.D. (author), Zhang, G.Q. (author)
A methodology, based on accelerated degradation testing, is developed to predict the lifetime of remote phosphor plates used in solid-state lighting (SSL) applications. Both thermal stress and light intensity are used to accelerate degradation reaction in remote phosphor plates. A reliability model, based on the Eyring relationship, is also...
journal article 2015
document
Yazdan Mehr, M. (author), van Driel, W.D. (author), Zhang, G.Q. (author)
In this paper, progresses of color maintenance, also known as color shift, in solid-state lighting (SSL) systems are thoroughly reviewed. First, color shift is introduced and a few examples are given from different real-life industrial conditions. Different degradation mechanisms in different parts of the system are also explained. Different...
review 2015
Searched for: author:"Yazdan Mehr, M."
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