Yazar "Düzyol, S." seçeneğine göre listele

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    Creep Behavior of Cankiri-turkey Rock Salt Under Uniaxial and Triaxial Loading Conditions
    (CRC PRESS-TAYLOR & FRANCIS GROUP, 2010) Özkan, İ.; Düzyol, S.
    The Cankiri rock salt region formed during the Tertiary period is an important mine region of Turkey. In the region, an underground room-and-pillar mining are used to extract rock salt. However, the database of mechanical properties was insufficient for design studies. Therefore, rock mechanics experiments were performed on core and cubic specimens. It was understood from preliminary studies that the scale effect on the uniaxial compressive strength (UCS) does not exist when the diameter (D) and width (W) for both specimen types are D >= 50 mm and W >= 50 mm. Some experiments were designed to determine creep behavior. The creep behavior under uniaxial and triaxial loading was investigated using the uniaxial (UCT) and triaxial creep tests (TCT). Finally, a mathematical model describing the creep behavior was developed by statistical software SPSS V10. The model parameters were time, uniaxial and confining pressure. Values calculated using the proposed function were compared with experimental results.
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    Critical Solution Surface Tension for Liquid-Liquid Extraction
    (ELSEVIER, 2010) Özkan, A.; Düzyol, S.
    This paper introduces a strong correlation between the solution surface tension and the liquid-liquid extraction process of minerals. It was found that the liquid-liquid extraction recoveries of celestite, magnesite and dolomite minerals decreased with decreasing solution surface tension, and eventually the liquid-liquid extraction of these minerals did not take place below a particular value of the solution surface tension. The solution surface tension value at which liquid-liquid extraction does not occur was defined as 'the critical solution surface tension for liquid-liquid extraction, gamma(c-e)'. Consequently, the solution surface tension value for a successful liquid-liquid extraction of a mineral must be higher than the critical solution surface tension of liquid-liquid extraction (gamma(c-e)) value. In addition, the experimental results have demonstrated that the gamma(c-e) values obtained from liquid-liquid extraction tests of these minerals were slightly higher than their critical surface tension of wetting (gamma(c)) values based on the contact angle measurement technique. These differences between the gamma(c-e) and the gamma(c) values indicate that the liquid-liquid extraction process of the minerals took place after reaching a sufficiently low wettability.