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Harandi, Ali Nazemi (author), Eslami, Abdoulmajid (author), Bahrami, Abbas (author), Bakhtafrouz, Asghar (author), Yazdan Mehr, M. (author)This study presents a failure analysis in two reformer tubes used for hydrogen production in a petrochemical industry. These tubes (Tube A and Tube B) were made by the centrifugal casting of HP-Nb alloy in such a way that one contained titanium as a micro-element, and the other was free from titanium in its chemical composition. Although the two...journal article 2023
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Alali, Arkan (author), Hosseini-Abari, Afrouzossadat (author), Bahrami, A. (author), Yazdan Mehr, M. (author)Modification of paint with nanoparticles (NPs) provides self-cleaning, water/dirt-repellent, and other properties. Therefore, the aim of the present study was to biosynthesize silver (Ag) and copper oxide (CuO) NPs and to prepare NP-modified paint. To this end, AgNPs and CuONPs were biosynthesized using Bacillus atrophaeus spores and commercial...journal article 2023
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Yazdan Mehr, M. (author), Hajipour, Pejman (author), van Zeijl, H.W. (author), van Driel, W.D. (author), Cooremans, Thierry (author), De Buyl, Francois (author), Zhang, Kouchi (author)Adhesive bonding is a key joining technology in many industrial applications, including automotive, aerospace industries, biomedical devices, and microelectronic components. Adhesive bonding is gaining more and more attention due to the increasing demand for joining similar or dissimilar components, mostly within the framework of designing...conference paper 2023
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Torkian, Niloufar (author), Bahrami, Abbas (author), Hosseini-Abari, Afrouzossadat (author), Momeni, Mohammad Mohsen (author), Abdolkarimi-Mahabadi, Meisam (author), Bayat, Ahmad (author), Hajipour, Pejman (author), Rourani, Hamed Amini (author), Yazdan Mehr, M. (author)This paper investigates the synthesis, antibacterial, and photocatalytic properties of silver ion-exchanged natural zeolite/TiO2 photocatalyst nanocomposite. Zeolite is known to have a porous surface structure, making it an ideal substrate and framework in different nanocomposites. Moreover, natural zeolite has a superior thermal and chemical...journal article 2022
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Yazdan Mehr, M. (author), van Driel, W.D. (author), Zhang, Kouchi (author)In this chapter, degradation mechanisms of optical materials, used in the light-emitting diode (LED)-based products, are explained. This chapter aims at describing the service conditions on the degradation mechanisms of different organic optical materials in LEDs which lead to the color shift of the light output. The contributions of different...book chapter 2022
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van Driel, W.D. (author), Yazdan Mehr, M. (author), Fan, X. J. (author), Zhang, Kouchi (author)In the foregoing chapters, the reliability of organic compounds in microelectronics and optoelectronics was discussed. It provided a state of the art in reliability concepts for materials used in electronic products. It also enlightened the direction in reliability concepts for these products. In this chapter, we discuss the outlook where we...book chapter 2022
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Hajipour, Pejman (author), Bahrami, Abbas (author), Yazdan Mehr, M. (author), van Driel, W.D. (author), Zhang, Kouchi (author)This paper investigates the photocatalytic characteristics of Ag nanowire (AgNW)/TiO2 and AgNW/TiO2/graphene oxide (GO) nanocomposites. Samples were synthesized by the direct coating of TiO2 particles on the surface of silver nanowires. As-prepared AgNW/TiO2 and AgNW/TiO2/GO nanocomposites were characterized by electron microscopy, X-ray...journal article 2021
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Khouzani, Mahdi Kiani (author), Bahrami, Abbas (author), Yazdan Mehr, M. (author), van Driel, W.D. (author), Zhang, Kouchi (author)This paper aims to investigate the synthesis, structure, and optical properties of SiO<sub>2</sub> @YAG:Ce core–shell optical nanoparticles for solid state lighting applications. YAG:Ce phosphor is a key part in white light emitting diodes (LEDs), with its main functionality being the generation of yellow light. Generated yellow light from...journal article 2020
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Yazdan Mehr, M. (author), Bahrami, A. (author), van Driel, W.D. (author), Fan, X.J. (author), Davis, J.L. (author), Zhang, Kouchi (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 2020
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Bahrami, Abbas (author), Khouzani, Mahdi Kiani (author), Mokhtari, Seyed Amirmohammad (author), Zareh, Shahin (author), Yazdan Mehr, M. (author)This paper investigates the root cause of the formation of surface cracks on hot-rolled C-Mn constructional steel heavy plates. Cracks are rather evenly distributed over the surface in the form of colonies of cracks. Samples were cut from the heavy plate. The microstructure of samples in the as-cast and hot-rolled states were studied using...journal article 2019
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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
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Bahrami, Abbas (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
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Yazdan Mehr, M. (author), van Driel, W.D. (author), Zhang, Kouchi (author)This paper investigates degradation and failure mechanisms of BPA-PC lenses in simulated harsh environment conditions. Exposure of secondary optics in Light Emitting Diode LED-based systems or any other similar applications to environmental stresses can adversely effect the performance and lifetime of products. This paper simulates a harsh...conference paper 2019
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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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Yazdan Mehr, M. (author), Toroghinejad, M.R. (author), Karimzadeh, F. (author), van Driel, W.D. (author), Zhang, Kouchi (author)Reduction of intensity of light output is one of the most common degradation modes in light-emitting diode (LED) systems. It starts from the failure of the various components in the system, including the chip, the driver, and optical components (i.e. phosphorous layer). The kinetics of degradation in real life applications is relatively slow...journal article 2018
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Yazdan Mehr, M. (author), van Driel, W.D. (author), Zhang, Kouchi (author)Lumen depreciation is one of the major failure modes in light-emitting diode (LED) systems. It originates from the degradation of the different components within the system, including the chip, the driver, and the optical materials (i.e., phosphorous layer). The kinetics of degradation in real-life applications is relatively slow, and in most...book chapter 2018
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Yazdan Mehr, M. (author), Vollebregt, S. (author), van Driel, W.D. (author), Zhang, Kouchi (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
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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
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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
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Yazdan Mehr, M. (author), van Driel, W.D. (author), Zhang, Kouchi (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
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