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    The effect of an instructional intervention on elementary students' science process skills
    (Routledge Journals, Taylor & Francis Ltd, 2017) Durmaz, Husnuye; Mutlu, Seckin
    The authors' aim was to investigate the effects of the instructional intervention on science processes skills (SPSs) of seventh-grade students. The study was designed as nonequivalent control-group pretest-posttest, and it was carried out with 43 students. Participants were chosen according to the convenient sampling method. The authors collected data from the test of SPSs assessment, worksheets, or experiment reports. While the control group received a regular teaching approach over existing science curriculum, an instructional intervention by emphasizing SPSs via multiple types of practical activities was used to improve SPSs of the experimental group. Data obtained were analyzed both for inferential and descriptive purposes. The results indicated a significant difference between the experimental group's pretest and posttest scores related to the assessment SPSs. However, the difference between the control group's pretest and posttest scores related to the test of SPSs assessment was not significant. Despite the limitations of the study such as small sample size, lack of analysis of the long-term students' outcomes of SPSs, and no collection of performance-based assessment data from the control group, the authors suggest that the experimental group improved their SPSs via the instructional intervention more than the control group students. The study results also revealed that the students had several problems in using SPSs.
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    Influence of hexylamine and alcohols as cosurfactants on microemulsion phase behavior and solubilization
    (St Petersburg Natl Research Univ Information Technologies, Mech & Optics, 2019) Durmaz, Husnuye; Iscan, Mehmet
    This study investigated the influence of cosurfactants on the phase behavior and solubilization capacity of microemulsions. Firstly, we determined the influence of alcohol chain length on the microemulsion solubilization capacity in microemulsion systems containing sodium dodecyl sulfate (SDS), heptane, and water; utilizing n-butanol, n-hexanol, n-octanol and hexylamine as cosurfactants. Then, we compared the effect of the cosurfactant on the solubilization capacity of the microemulsion with SDS. Based on the results, we suggest that hexylamine is a good candidate to produce microemulsions since hexylamine behaved as a cationic surfactant. Secondly, keeping constant the rate of surfactant/cosurfactant and varying the rate of alcohol to hexylamine as cosurfactant, we explain the cosurfactant effect in systems with SDS, alcohol, methylene chloride, and sodium molybdate using the spectrophotometric method. Results showed that the absorbance (ABS) values increased continuously in the systems of n-octanol and n-decanol with increasing amounts of hexylamine. The change in ABS values is considered to be related to microemulsion structure inversion.