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Wyszukujesz frazę "Yalçin, O." wg kryterium: Autor

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    Wyświetlanie 1-4 z 4
    Tytuł:
    Spin-1 Model of Noninteracting Nanoparticles
    Autorzy:
    Yalçin, O.
    Erdem, R.
    Övűnç, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812046.pdf
    Data publikacji:
    2008-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Tt
    75.60.-d
    05.50.+q
    05.70.Ln
    Opis:
    In this work, we presented a spin-1 model to investigate the magnetic properties of noninteracting monodomain nanoparticles based on the pair approximation. Nearest-neighbor pair interactions are incorporated between the Ising spins in three parts that are core, core-surface, and surface within the nanoparticle. Using the spin-1 Ising model of magnetization in the pair approximation, we calculated the free energy and minimized with respect to pair variables to obtain the field-cooled magnetization. Hysteresis loops of the system were plotted for various values of exchange coupling constants, and axial anisotropy of strength which couples the core, core-surface, and surface regions. The coercive field and its linear fit to the data were plotted as a function of radius of ferromagnetic nanoparticles.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 4; 835-844
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electric and Magnetic Properties of Hydrogels Doped with Cu Ions
    Autorzy:
    Coşkun, R.
    Okutan, M.
    Yalçın, O.
    Kösemen, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1418231.pdf
    Data publikacji:
    2012-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    52.25.Mq
    82.35.-x
    42.70.Jk
    64.60.-i
    76.30.-v
    Opis:
    The electric and magnetic properties of Cu doped and pure/undoped hydrogels were investigated by impedance spectroscopy and electron spin resonance techniques, respectively. The capacitance and dissipation factor (tan δ) were measured in the frequency range of 100 Hz-10 MHz at room temperature. The Cole-Cole plots for the Cu doped dry and pure dry hydrogels have been used to describe the characteristic change of electrical properties in mentioned temperature interval. The comparison between Cu ions doped and pure/undoped samples is done using the impedance spectroscopy and the electron spin resonance techniques. Electron spin resonance signal for pure, Cu doped wet and Cu doped dry samples are not any power absorption signal, near the symmetric with respect to the resonance field values according to the dry sample and asymmetric for resonance field/base line, respectively.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 4; 683-687
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    THE EFFECT OF FLIPPED CLASSROOM INSTRUCTION IN WRITING: A CASE STUDY WITH IRAQI EFL LEARNERS
    Autorzy:
    O. Qader, Ramyar
    Arslan, Fadime Yalcin
    Powiązania:
    https://bibliotekanauki.pl/articles/955462.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Marii Curie-Skłodowskiej w Lublinie. IATEFL Poland Computer Special Interest Group
    Tematy:
    Flipped Classroom Instruction
    English as a foreign language
    traditional instruction
    writing skills
    Opis:
    The purpose of this study is to examine the effect of Flipped Classroom Instruction (FCI) on Iraqi EFL learners’ writing skills. Participants included 66 students in the College of Languages English Department at Salahaddin University. The study employed a mixed method of data collection, utilizing pre-and post-writing tests as well as a questionnaire for both groups and interviews conducted with the experimental group. Findings indicated that a statistically significant difference existed between the control and experimental groups and, more specifically, the students of the experimental group performed better on the writing tests than the students of the control group. The majority of the learners’ attitudes towards FCI were positive.
    Źródło:
    Teaching English with Technology; 2019, 19, 1; 36-55
    1642-1027
    Pojawia się w:
    Teaching English with Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Changes of surface properties of calcite particles with calcium stearate using conventional experimental design and properties of coated calcite
    Autorzy:
    Ucurum, M.
    Bayram, O.
    Toraman, O. Y,
    Kılıc, H.
    Yalcın, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/109347.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    calcite
    surface modification
    mechano-chemical
    calcium stearate
    properties of modified calcite
    Opis:
    Calcite is utilized as a filler mineral in the industries such as plastics, rubber, and paint, to gain products with a variety of features. In order to use a calcite ore as a filler, some specific physical and physico-chemical properties are required such as ultra-fine sizes and conversion of hydrophilic to hydrophobic structure. In the present study, for these purposes, surfaces of the ultra-fine calcite powder (d50=2.94 μm) were coated by a mechano-chemical process with calcium stearate [Ca(C17H35COO)2] in a stirred ball mill. The influence of operating parameters such as calcite filling-ratio, ball-filling ratio, operation speed, grinding time and chemical dosage on the active ratio (%) was systematically examined. Then, the properties of modified calcite product were measured and evaluated by contact angle, TGA, DTA, FTIR, and SEM. The results showed that the mechano-chemical technology is very effective for modifying the surface of micronized calcite products using calcium stearate chemical.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 3; 688-700
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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