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    Changes of surface properties of calcite particles with calcium stearate using conventional experimental design and properties of coated calcite
    (Oficyna Wydawnicza Politechniki Wroclawskiej, 2018) Ucurum M.; Bayram O.; Toraman O.Y.; Kilic H.; Yalcin S.
    Calcite is utilized as a filler mineral in the industries such as plastics, rubber, and paint, to gain products with a variety of features. In order to use a calcite ore as a filler, some specific physical and physico-chemical properties are required such as ultra-fine sizes and conversion of hydrophilic to hydrophobic structure. In the present study, for these purposes, surfaces of the ultra-fine calcite powder (d50=2.94 ?m) were coated by a mechano-chemical process with calcium stearate [Ca(C17H35COO)2] in a stirred ball mill. The influence of operating parameters such as calcite filling-ratio, ball-filling ratio, operation speed, grinding time and chemical dosage on the active ratio (%) was systematically examined. Then, the properties of modified calcite product were measured and evaluated by contact angle, TGA, DTA, FTIR, and SEM. The results showed that the mechano-chemical technology is very effective for modifying the surface of micronized calcite products using calcium stearate chemical. © Wroclaw University of Science and Technology.
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    Evaluation of electromagnetic interference emitted from compact fluorescent lamps according to CISPR-15
    (Electromagnetics Academy, 2015) Kocakusak A.; Cakir M.; Yalcin S.; Ozen S.; Helhel S.
    In this study, Electromagnetic interference (EMI) emitted by the compact fluorescent lamps (CFL) having biggest pie in the market has been investigated according to CISPR-15. Emissions of CFLs vary depending on trademark, since some cannot provide the requirements of CISPR-15 standards such that they act as contaminants in the electric supply system. Conducted analysis considering the limits of CISPR-15 at 150-500 kHz frequency brings out that the effect of CFL produced by Company A at 181.298 kHz is 83.94 dB?V, whereas the effect of CFL produced by Company D at 173.593kHz frequency is 49,92dB?V, respectively. Obtained results are out of CISPR-15 limits of 66-56 dB?V.