Browsing by Author "Kazici, Hilal celik"

Now showing 1 - 2 of 2

Cross-Linked Poly(styrene-Co Quartz and Kaolinite Proppants for Hydraulic Fracturing Applications
(Springer Heidelberg, 2025) Akkus, Ihsan Nuri; Akinay, Yuksel; Zengin, Adem; Kazici, Hilal celik
The hydraulic fracturing operation, used as a production process in shale gas and coalbed methane reservoirs in the oil and natural gas industry, consists of fracturing fluid, proppant, and many other chemicals. This study successfully produced hydraulic fracturing proppants based on quartz and kaolinite minerals using divinyl benzene cross-linked styrene polymer with an in situ suspension polymerization method. Morphological analysis of the prepared proppants confirmed their spherical structure and the sphericity of quartz and kaolinite proppants were determined as 0.9. The polymer shells of the prepared proppants showed thermal resistance up to 375 degrees C and then decomposed between 375 degrees C and 575 degrees C. As a result of mechanical tests, quartz proppants showed a crush resistance of 14.08% under a load of 18,000 psi. Similarly, a crush resistance of 14.28% for kaolinite proppants was determined under a load of 15,000 psi. The apparent densities of quartz and kaolinite proppants were determined as 1.635 g/cm3 and 1.365 g/cm3, respectively. However, quartz proppants mostly display brittle breakage behavior, while kaolinite proppants are plastically deformed under the applied load.
Employee Performance, Service Quality and Satisfaction in Higher Education Institutions
(Tuba-turkish Acad Sciences, 2023) Kilicli, Yasin; Kazici, Hilal celik; Kipcak, Emrullah
Rapid changes and developments in the world affect service-based as well as product-based organisations. Higher education institutions, which can be considered service-based organisations, play a crucial role in developing countries by training qualified human resources. To compete in the international arena, higher education institutions should prioritize the services of units that contribute significantly to the development of R&D infrastructure. As such, this study aims to examine the effect of employee performance on service quality and satisfaction in the coordination unit of scientific research projects in a higher education institution. It also aims to investigate whether service quality has a mediating effect between employee performance and satisfaction. The questionnaire method was used in the study and 281 participants responded to the questionnaire. The findings of the study show that employee performance affects satisfaction in a weak and statistically insignificant way, while it affects service quality in a strong and statistically significant way. While service quality has a strong and statistically significant effect on satisfaction, it was also found to have a mediating effect between employee performance and satisfaction. The insignificant impact of employee performance on satisfaction revealed in this study indicates that managers should not ignore the need for competent and sufficient human resources to ensure a high level of satisfaction.