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Wyszukujesz frazę "İlhan, S." wg kryterium: Autor

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    Wyświetlanie 1-7 z 7
    Tytuł:
    An upper bound for third Hankel determinant of starlike functions related to shell-like curves connected with Fibonacci numbers
    Autorzy:
    Sokół, J.
    İlhan, S.
    Güney, H. Ö.
    Powiązania:
    https://bibliotekanauki.pl/articles/2052451.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
    Tematy:
    analytic function
    convex function
    Fibonacci numbers
    Hankel determinant
    hell-like curve
    starlike function
    funkcja analityczna
    funkcja wypukła
    ciąg Fibonacciego
    wyznacznik Hankela
    krzywa
    funkcja gwiaździsta
    Opis:
    We investigate the third Hankel determinant problem for some starlike functions in the open unit disc, that are related to shell-like curves and connected with Fibonacci numbers. For this, firstly, we prove a conjecture, posed in [17], for sharp upper bound of second Hankel determinant. In the sequel, we obtain another sharp coefficient bound which we apply in solving the problem of the third Hankel determinant for these functions.
    Źródło:
    Journal of Mathematics and Applications; 2018, 41; 195-206
    1733-6775
    2300-9926
    Pojawia się w:
    Journal of Mathematics and Applications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of welding current on nugget sizes in resistance spot welding of SPA-C steel sheets used in railway vehicles
    Autorzy:
    Akkaş, N.
    Ferik, E.
    İlhan, E.
    Aslanlar, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1068169.pdf
    Data publikacji:
    2016-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.20.Vj
    06.60.Vz
    Opis:
    This paper presents an experimental study on resistance spot welding of SPA-C steel sheets used in side wall and roof in rail vehicles. SPA-C steel sheets having 2.3 mm thicknesses were joined by using resistance spot welding as lap joint. A timer and current controlled resistance spot welding machine having 120 kVA capacity and a pneumatic application mechanism with a single lever was used to prepare the specimens. Welding periods were chosen as 10, 15, 20, 25 and 30 periods and also welding currents were increased from 6 kA up to 11.5 kA by rise of 0.5 kA. The electrode force was kept constant at 6 kN. The nugget sizes of prepared welding specimens were calculated by means of an optical microscope and the obtained results were supported by diagrams and, finally, appropriate welding parameters were advised to the users.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 1; 142-144
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Welding Time Effect on Mechanical Properties in Resistance Spot Welding of S235JR(Cu) Steel Sheets Used in Railway Vehicles
    Autorzy:
    Akkaş, N.
    İlhan, E.
    Varol, F.
    Aslanlar, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1187223.pdf
    Data publikacji:
    2016-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.20.Vj
    Opis:
    In this paper, S235JR(Cu) steel sheets were welded by electrical resistance spot welding method. Their thickness was 2 mm and joints were prepared in overlap joint form. A timer and current controlled resistance spot welding machine having 120 kVA capacity and a pneumatic application mechanism with a single lever was used to prepare the specimens. Welding periods were chosen as 5, 10, 15, 20, 25, and 30 periods and also welding currents were increased from 6 kA up to 14 kA by rise of 0.5 kA. The electrode force was kept constant at 6 kN. The obtained welding joints were exposed to tensile-peel and tensile-shear tests. As a result of these experiments, the maximum tensile-shear and tensile-peel strength are obtained in 30 period welding time for 8.5 kA welding current.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 4; 541-543
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of nugget sizes on mechanical properties in resistance spot welding of S235JR(Cu) steel sheets used in railway vehicles
    Autorzy:
    Akkaş, N.
    Ferik, E.
    İlhan, E.
    Aslanlar, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1061494.pdf
    Data publikacji:
    2016-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.20.Vj
    06.60.Vz
    Opis:
    This paper presents an experimental study on the resistance spot welding of S235JR(Cu) steel sheets used in side walls and roofs of rail vehicle bodies. A timer and current controlled resistance spot welding machine having 120 kVA capacity and a pneumatic application mechanism with a single lever were used to prepare the specimens. Welding duration was chosen to be 5, 10, 15, 20, 25 and 30 periods (1 period = 0.02 s) and also welding currents were increased from 6 kA up to 14 kA in steps of 0.5 kA. The electrode force was kept constant at 6 kN. The obtained welding joints were exposed to tensile peel and tensile shear tests and their nugget sizes were measured by means of an optical microscope. The effect of nugget sizes on tensile peel strength and tensile-shear strength was determined using weld lobe diagrams. Based on this data the optimum welding currents and times were advised.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 1; 60-63
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of crystallinity and surface silanol groups on rheological properties of different sepiolites
    Autorzy:
    Çınar, Mustafa
    Gülgönül, Ilhan
    Ozdemir, Orhan
    Çelik, Mehmet S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2146875.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    sepiolite
    rheology
    crystallinity
    pH
    Opis:
    In this study, differences in the rheological properties of three different types of brown sepiolites (K1, K2, and K3) along with one beige (B) sepiolite with different physicochemical properties were explained based on their crystallinity and level of surface silanol groups. Towards this aim, SEM images, XRD and chemical analyses, cation exchange capacity (CEC), and water absorption tests were conducted along with surface area measurements and time-dependent pH profiles. The pH profiles at 3% by wt. revealed that each sepiolite sample attained the equilibrium at different times. These differences showed a parallel behavior with the degree of crystallinity. While sepiolite with better crystallinity (K1) was rather slow in reaching the equilibrium pH, the sepiolites with poor crystallinity (B and K3) reached their equilibrium pH more quickly. The rheological studies conducted with different sepiolites at 3% solids concentration exhibited time-dependent flow of the Bingham plastic model and thixotropic. Differences observed in the rheological behavior of sepiolites were found to correlate with the fiber size, CEC, surface area, and water absorption. The results further indicated that sepiolites with low crystallinity or high level of surface silanol groups (K3 and B sepiolites) show the best rheological properties.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 5; art. no. 153947
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of Mechanical Properties of Metal Inert Gas-Brazed TRIP800 Steel Joints Using Different Shielding Gas Flow Rate
    Autorzy:
    Akkas, N.
    Varol, F.
    Ferik, E.
    Ilhan, E.
    Ozsarac, U.
    Aslanlar, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1195263.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.20.Vj
    Opis:
    In this study, TRIP 800 (transformation induced plasticity) steel plates having 1.5 mm thickness were joined by copper-based (CuAl8) wire in gas metal arc brazing technique. Specimens were prepared in joining forms as butt joint. Brazing operations were done with five different shielding gas flow rates of 8, 10, 12, 14, and 16 L/min. CuAl8 wire composed mostly of copper serves as the filler metal. Having accomplished the brazing operations, tensile properties of joints were detected, and micro- and macrostructures of joints were investigated in order to see the joinability of TRIP 800 steel by gas metal arc brazing technique.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 473-474
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Welding Current on Mechanical Properties of Welding Joints in S235JR(Cu) Steel Sheets in Resistance Spot Welding
    Autorzy:
    Akkas, N.
    Varol, F.
    Ferik, E.
    Ilhan, E.
    Ozsarac, U.
    Aslanlar, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1195245.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.20.Vj
    Opis:
    This paper presents an experimental study on resistance spot welding of S235JR(Cu) steel sheets used in side wall and roof in rail vehicles. S235JR(Cu) steel sheets having 2.0 mm thicknesses were joined by using resistance spot welding as lap joint. A timer and current controlled resistance spot welding machine having 120 kVA capacity and a pneumatic application mechanism with a single lever was used to prepare the specimens. Welding periods were chosen as 10, 15, 20, 25 and 30 cycles and also welding currents were increased from 6 kA up to 14 kA by rise of 1 kA. The electrode force was kept constant at 6 kN. The prepared welding specimens were exposed to tensile-shear and tensile-peel tests and the obtained results were supported by diagrams and, finally, appropriate welding parameters were advised to the users.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 500-502
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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