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    Characteristic Properties of Dy-Eu-Ag co-Doped TiO2 Nanoparticles Prepared by Electrospinning Processes
    (POLISH ACAD SCIENCES INST PHYSICS, 2015) Evcin, A.; Bezir, N. C.; Kayali, R.; Kasikci, M.; Oktay, A.
    TiO2 with high photoactive wide band gap energy semiconductor has been studied intensively for its attractive applications as photo catalyst and solar cell. TiO2 has three kinds of different crystal structures; anatase, brookite and rutile. TiO2-nanoparticles could become valuable light emitting materials when they are doped with highly luminescent rare earth ions. In this study, Dy-Eu-Ag co-doped TiO2 nano particles were prepared by electrospinning method. The crystal structures of nanofibers were determined X-Ray Diffraction device (XRD), morphology of the samples were analyzed by scanning electron microscope (SEM), and the optical properties of the samples were determined by ultraviolet/visible spectrometer (UV/VIS) measurements. Electrical and electronic properties of the sampled were determined using the data obtained from four point prob technique (FPPT).
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    Performance of a salt gradient solar pond with reflective covered surface and derivation of analytic functions for air and soil temperatures for isparta region
    (AMER INST PHYSICS, 2007) Bezir, N. C.; Oezek, N.; Kayali, R.; Oeztuerk, M.; Cetin, SA; Hikmet, I
    In this study, salt gradient solar pond having a surface area of 3.5x3.5 m(2) and depth of 2 m has been constructed in Isparta/Turkiye and a computer software, capable of giving the temporal temperature variation at any point inside or outside a insulated solar pond at any time is presented. Hourly average values of air temperature and daily average soil temperature for the site were used as input parameters. These parameters have been calculated from analytical functions derived by using the hourly and daily temperature values for air and soil data obtained from the local meteorological station in Isparta region, respectively. The results obtained using analytic functions were in good agreement with the experimental results. Performance of the pond has been investigated theoretically and experimentally.
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    Theoretical and Experimental Analysis of a Salt Gradient Solar Pond with Insulated and Reflective Covers
    (TAYLOR & FRANCIS INC, 2009) Bezir, N. C.; Ozek, N.; Kayali, R.; Yakut, A. K.; Sencan, A.; Kalogirou, S.
    In this study, a salt gradient solar pond having a surface area of 3.5 3.5 m2 and depth of 2 m has been built for supplying hot water to a leather workshop on the campus area of Vocational College of Isparta/Yalvac. A cover system was used on the surface of the pond to reduce the thermal losses from the top to air and to increase the thermal efficiency of the pond. Such an arrangement is used for the very first time. The system is composed of two covers that can be rotated between 0 and 180 degrees by a controlled electric motor and has insulation and reflection properties, i.e., the covers function as insulators when closed and as reflectors when opened. The pond's thermal analysis has been carried out theoretically and experimentally for different operating conditions. Results obtained from this study show that salt gradient solar ponds can be used as a source of warm water required at the leather workshop and for suitable domestic applications. The covers were effective both for reducing the night thermal losses and for increasing the daytime performance, although the former effect is negligible.