Browsing by Author "Kurt, S."

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    The effect of the worksheets on students' achievement in chemical equilibrium
    (Ekip Ltd. Sti., 2011) Yıldırım, N.; Kurt, S.; Ayas, A.
    In the present study, it is aimed to determine effects of worksheets on students' achievement on the factors affecting equilibrium. The study was carried out with a quasi-experimental design. Data were collected through chemical equilibrium concept test, semi structured interviews and unstructured observations. The sample was 44 eleventh grade students enrolled in two classes from a secondary school in Trabzon in the fall term of the 2008-2009 academic years. Interview data were analysed descriptively. Data collected from chemical equilibrium concept test were analysed by using SPSS statistical programme. On the other hand data from unstructured observations were organized and then given directly. At the end of the study, it is found that experimental group students were more successful than the control group. As a result, a number of suggestions were made about development of worksheets in other difficult concepts of chemistry.
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    Improving students' understanding and explaining real life problems on concepts of reaction rate by using a four step constructivist approach
    (Sila Science, 2012) Kurt, S.; Ayas, A.
    The aim of this study was to investigate the effects of activities developed based on a four-step constructivist approach on students' understanding and explaining real-life problems about reaction rate concepts in chemistry. The study was carried out with 41 eleventh grade students, from two different classes attending a secondary school in Turkey. Two classes were randomly designated as experimental and control groups. While teaching the subject, a four-step constructivist approach was used for the experimental group whereas in control group, students were taught by the traditional method. Teaching activities in both groups were observed by one of the researchers. In both groups, Real-life Relating Test (RRT), including the phenomena that students observe in their daily life about reaction rate concepts was implemented before and after the intervention. Also semi-structured interviews were conducted with 13 students chosen from the both groups. At the end of the study, it was determined that the intervention which was carried out based on a four-step constructivist approach helped more the students in explaining real-life problems in a scientific way and provide more lasting learning than traditional approach. It is suggested that such activities should be used in other abstract or problematic concepts in chemistry.
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    Rapid TAURUS for relaxation-based color magnetic particle imaging
    (Institute of Electrical and Electronics Engineers Inc., 2022-08-03) Aslan, M. Tunç; Özaslan, A. Alper; Kurt, S.; Muslu, Y.; Saritas, Emine Ulku
    Magnetic particle imaging (MPI) is a rapidly developing medical imaging modality that exploits the non-linear response of magnetic nanoparticles (MNPs). Color MPI widens the functionality of MPI, empowering it with the capability to distinguish different MNPs and/or MNP environments. The system function approach for color MPI relies on extensive calibrations that capture the differences in the harmonic responses of the MNPs. An alternative calibration-free x-space-based method called TAURUS estimates a map of the relaxation time constant, τ , by recovering the underlying mirror symmetry in the MPI signal. However, TAURUS requires a back and forth scanning of a given region, restricting its usage to slow trajectories with constant or piecewise constant focus fields (FFs). In this work, we propose a novel technique to increase the performance of TAURUS and enable τ map estimation for rapid and multi-dimensional trajectories. The proposed technique is based on correcting the distortions on mirror symmetry induced by time-varying FFs. We demonstrate via simulations and experiments in our in-house MPI scanner that the proposed method successfully estimates high-fidelity τ maps for rapid trajectories that provide orders of magnitude reduction in scanning time (over 300 fold for simulations and over 8 fold for experiments) while preserving the calibration-free property of TAURUS.