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    Wyświetlanie 1-4 z 4
    Tytuł:
    Comparison of Experimental and Theoretical Double Differential Cross Sections of CH₄ at 250 eV Impact Energy
    Autorzy:
    Isik, N.
    Yavuz, M.
    Aksoy, E.
    Ozer, Z.
    Ulu, M.
    Sahlaoui, M.
    Boumediene, L.
    Bouamoud, M.
    Dogan, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401296.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    34.80.Gs
    Opis:
    In this study, experimental and theoretical double differential cross section (DDCS) data for methane-electron interaction mechanism after the impact of a 250 eV electron have been comprehensively determined for a wide energy range of the detected electron, from 50 to 225 eV. The first Born-One Coulomb wave modeling with Gamow factor has been calculated to analyze experimental DDCS results for a correct description of the electron impact ionization of methane molecule. It is found that these theoretical calculations are successful to describe the post-collision interaction effects due to the Coulomb long-range interaction between the outgoing electrons in the final state. A considerable agreement is found between experimental and theoretical results.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 1112-1114
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pollen morphology in the tribe Nigelleae (Ranunculaceae): a worldwide palynological investigation into the species
    Autorzy:
    Isik, S.
    Donmez, E.O.
    Aydin, Z.U.
    Donmez, A.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2117898.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    Garidella
    Komaroffia
    multivariate analysis
    Nigella
    Ranunculaceae
    pollen morphology
    Opis:
    The pollen morphology of many collections of taxa of the tribe Nigelleae from the family Ranunculaceae which occur worldwide is presented in this study. A total of 88 specimens from 21 taxa, some of which were recently proposed, belonging to the genera Komaroffia, Garidella, and Nigella of Nigelleae were examined using light microscopy (LM) and scanning electron microscopy (SEM). In the tribe, the pollen type is mostly trizonocolpate, but in many taxa and specimens, both trizonocolpate and non-trizonocolpate types occur together. The pollen grains are small to medium (25–53.75 μm × 20–55 μm) in size and oblate to prolate in shape. The exine pattern at the mesocolpium in all the taxa investigated is similar: micro-echinate in LM and micro-echinate-punctate in SEM. The colpus membrane in Komaroffia and Nigella is micro-echinate in both LM and SEM. In Garidella, it is micro-echinate in LM but echinate (spinulose) in SEM. In this study, multivariate analyses, principal component analysis (PCA), and unweighted pair group method with arithmetic mean (UPGMA), were used to evaluate relationships between the genera and species within the tribe with respect to pollen morphology. PCA results show three main groups in the tribe: Garidella, Komaroffia, and Nigella. Moreover, the UPGMA tree also chiefly supports generic segregation into the smaller genera. An overall synthesis of the pollen characteristics of the three genera is provided and discussed.
    Źródło:
    Acta Biologica Cracoviensia. Series Botanica; 2019, 61, 1; 93-102
    0001-5296
    Pojawia się w:
    Acta Biologica Cracoviensia. Series Botanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Protection of Ten-Eyed Bridge in Diyarbakır
    Autorzy:
    Karasin, I. B.
    Isik, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/390971.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
    Tematy:
    historic Ten-Eyed Bridge
    heritage protection
    Diyarbakır
    Opis:
    Mesopotamia, which is one of the strategical regions of the Middle East, has hosted numerous communities and civilizations since the ancient times of human history. This situation made the region considerably prosperous in terms of historical and cultural heritage. Ten-Eyed Bridge, that is one of the most important historical and cultural symbols of Diyarbakir, having lasted till today, became an example of this prosperous heritage. However, various interventions and deteriorations have occurred in the construction within long time due to the impact of human and nature. Because of the considerable temperature difference arising due to continental climate of the region as well as damages like the change of conditions of use, amortizations in bearing constructional components in contact with water have emerged. In this study, with the purpose of ensuring further future existence of Ten-Eyed Bridge, adopted methods for structural and physical deteriorations and protection works were examined.
    Źródło:
    Budownictwo i Architektura; 2016, 15, 1; 87-94
    1899-0665
    Pojawia się w:
    Budownictwo i Architektura
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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