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

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    Wyświetlanie 1-4 z 4
    Tytuł:
    Inclined surface cracks in a graded half-plane subjected to frictional sliding contact
    Autorzy:
    Arslan, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/281181.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    inclined surface cracks
    crack/contact problems
    graded materials
    finite element method
    Opis:
    Fracture parameters of an inclined surface crack in a graded half-plane subjected to sliding frictional contact are investigated in this study. The problem is modelled via the finite element method (FEM) under the plane strain assumption employing a newly developed displacement boundary condition. The shear modulus of the half-plane is graded exponentially through the thickness direction by means of the homogeneous finite element approach. The augmented Lagrange algorithm is selected as an iterative contact solver. The mixed mode stress intensity factors (SIFs) which are induced by the contact stresses are evaluated utilizing the Displacement Correlation Technique (DCT). The accuracy of the present procedure is ensured comparing the SIF results to those calculated by an analytical method for vertical surface cracks. Additional SIF curves are generated as functions of the crack inclination in order to reveal the effects of non-homogeneity, punch location, crack length and friction coefficient. The prominent conclusion of this study indicates that the crack orientation has profound effects on the behavior of SIF curves, which has not been presented in any study published so far. Hence, consideration of crack inclination is proved essential to successfully predict fracture behavior of a graded medium under frictional contact.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2018, 56, 4; 915-925
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    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:
    An experimental study on the shear strength of SFRC beams without stirrups
    Autorzy:
    Arslan, G.
    Keskin, R. S. O.
    Ulusoy, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/279535.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    steel fiber
    reinforced concrete
    shear strength
    beam
    Opis:
    The use of steel fibers in reinforced concrete (RC) structural members aims at the improvement of mechanical properties of such members. This study focuses on shear strength characteristics of steel fiber reinforced concrete (SFRC) beams without stirrups. Test specimens consisting of three RC and ten SFRC beams without stirrups have been tested under three-point loading in order to investigate the effects of fiber content and shear span-to-effective depth ratio on the shear strength. Furthermore, an equation developed previously for predicting the ultimate shear strength of SFRC beams without stirrups is proposed to predict the diagonal cracking strength of SFRC beams without stirrups.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2017, 55, 4; 1205-1217
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Seasonal variations, environmental parameters, and standing crop assessment of benthic foraminifera in eastern Bahrain, Arabian Gulf
    Autorzy:
    Arslan, M.
    Kaminski, M. A.
    Tawabini, B. S.
    Ilyas, M.
    Babalola, L. O.
    Frontalini, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060170.pdf
    Data publikacji:
    2016
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Arabian/Persian Gulf
    benthic foraminifera
    standing crop
    eastern Bahrain
    Opis:
    Living benthic foraminifera in a relatively unpolluted site offshore Bahrain in the Arabian Gulf, were studied to determine the seasonal variability of their populations, as well as environmental parameters that may affect their distribution. The maximum foraminiferal density was observed during winter with the assemblages primarily dominated by rotaliids and secondarily by miliolids. The high population is attributed to an increased number of juveniles. A relationship between sediment grain size and the foraminiferal density reveals that juveniles were most abundant on coarse-grained sandy substrate and less abundant on fine-grained substrates. In spring, the foraminiferal density decreased, and the lowest values were observed during summer. The population increased again in autumn with highest juvenile/adult ratios. Moreover, results of relative abundance and species consistency show that Ammonia and Glabratellina are consistent from the shallowest to the deepest station, whereas miliolids occurred only at deeper stations. The numbers of peneroplidae and Elphidium also increased along the depth transect. Environmental characterization reveals that although the site is subject to eutrophication caused by nitrates and sulfates, pollution caused by hydrocarbons and heavy metals is not significant. The assessment of 63 heavy metals showed that none of the metals had concentrations that exceed internationally accepted norms [the devised level of Effect Range-Low], but with high concentration of strontium. The lack of a significant environmental effect of heavy metals is confirmed by the Foraminiferal Abnormality Index of <2%. Likewise, no hydrocarbon contamination was detected in the water or sediment samples. We conclude that the site in Bahrain is not yet adversely affected by human development, and therefore can provide baseline information for future comparison and assessment of foraminiferal assemblages in contaminated zones of the Arabian Gulf.
    Źródło:
    Geological Quarterly; 2016, 60, 1; 26--37
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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