Browsing by Author "Senturk, Ufuk"

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Experimental modeling of silicate-based geothermal deposits
(Pergamon-elsevier Science Ltd, 2017) Celik, Ash; Topcu, Gokhan; Baba, Alper; Akdogan, Yasar; Senturk, Ufuk; Demir, Mustafa M.
Scaling by metal silicates represents a major obstacle for geothermal systems. A composition that enables the fabrication of artificial deposits is necessary for the rapid testing of potential inhibitors. In this work, artificial deposits were synthesized by employing experimental conditions similar to those in the Tuzla Geothermal Field in Turkey. Although refluxing enabled the formation of a precipitate that was similar to naturally formed deposits in color and texture, their elemental composition and morphology showed a mismatch. An autoclave enabled the production of a precipitate that more closely resembled naturally formed deposits in color, texture, elemental composition, and structure.
Optical enhancement of phosphor-converted wLEDs using glass beads
(Elsevier Science Bv, 2017) Guner, Tugrul; Senturk, Ufuk; Demir, Mustafa M.
YAG:Ce3+ is a yellow-source compound commonly used in phosphor conversion layers for direct coating or remote phosphor configurations in LED illumination. This material, however, suffers from a high correlated color temperature, and low color-rendering index due to its deficiency in the red spectrum. In this study, glass beads (GB) with an average particle diameter of 10 gm were introduced to the conversion layer of a YAG:Ce3+ particulate-filled polydimethylsiloxane matrix composite structure and found to improve the optical features of the resulting composite. (C) 2017 Elsevier B.V. All rights reserved.