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    Wyświetlanie 1-3 z 3
    Tytuł:
    Chromatographic Determination of Stabilizer in Nitrocellulose Based Propellants. (A new extraction based chromatographic method for the determination of stabilizers in propellants)
    Autorzy:
    Yücel, A.
    Inal, E. K.
    Akay, M. A.
    Atakol, O.
    Öz, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/358506.pdf
    Data publikacji:
    2011
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    HPLC
    propellants
    nitrocellulose based propellants
    energetic materials
    explosives
    Opis:
    Regarding the chromatographic analysis of the stabilizers in the double based propellants, nitrocellulose causes an interference problem with diphenylamine and its derivatives. In this study, specifc extraction of the stabilizer was planned before the chromatographic analysis and the stabilizer was extracted into CHCl3 by means of a soxhylet extraction in order to eliminate this problem. Then, most of the CHCl3 was evaporated under hydrothermal conditions and the residue was analyzed with HPLC after being dissolved in MeCN. By means of an isocratic work, the stabilizer 2-nitro diphenylamine (2NDPA) was clearly detected with 85% MeCN and 15% H2O carrier phase in C18 column. The effect of the matrix that could be found in the ambient was examined and the recovery was found between 95.06 +/-3.09 - 99.88 +/-3.34%. No matrix effect was determined in the ambient.
    Źródło:
    Central European Journal of Energetic Materials; 2011, 8, 3; 183-192
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Physiological and gene-expression variations in watermelon (Citrullus lanatus L.) cultivars exposed to drought stress
    Autorzy:
    Erez, M.E.
    Inal, B.
    Karipcin, M.Z.
    Altintas, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2130594.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    abiotic stress
    bioactive compounds
    Citrullus lanatus
    transcription factor
    Opis:
    Drought conditions may have direct or indirect effects on plant physiology, biochemistry, and molecular characteristics. The purpose of this study was to investigate the effects of drought stress on the physiological, biochemical, and molecular responses of three different watermelon cultivars with varying levels of drought tolerance (24: drought resistant, CS: moderately tolerant, and 98: drought sensitive). The cultivars exhibited different responses to cope with water stress according to their tolerance level. Drought induced significant reductions in chlorophyll a, total chlorophyll and carotenoid content and glutation reductase and ascorbate peroxidase activity in the sensitive cultivar unlike in the moderately tolerant and drought resistant cultivars. Additionally, the expression levels of NAC1, NAC2, ORE1, WRKY24, SAG12, SAG13, KCS2, CER1, DREB2A, LTP3, SWEET15, and PYL9 genes were measured using qRT-PCR. The expression ratios of the genes significantly varied depending on the gene location and on the tolerance of the cultivars. Results showed that the physiology and biochemical and molecular pathways of tolerant cultivars change to adapt to drought conditions. Therefore, the drought-resistant cultivar copes with drought stress by increasing proline content and antioxidant enzyme activities, as well as by increasing the expression of specific genes.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2020, 89, 2
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Relative intensities of the 3d-2p lines emitted by Ar¹³⁺ ions after impact excitation by an electron beam
    Autorzy:
    Rachedi, S.
    Inal, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1068589.pdf
    Data publikacji:
    2016-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    32.30.Rj
    32.70.Fw
    52.20.Fs
    Opis:
    The intensity ratio R of the dipole-allowed lines 3d²D_{3/2,5/2} → 2p²P_{3/2} and 3d²D_{3/2} → 2p²P_{1/2} emitted from highly charged boron-like Ar¹³⁺ ion collisionally excited by a monoenergetic electron beam has been theoretically studied versus electron densities from 10⁹ to 5× 10¹³ cm^{-3}. The calculations were performed at different angles θ of observation with respect to the electron beam direction and various incident-electron energies e_{ı} from 0.65 to 3 keV. By taking into account all important transitions among 290 magnetic sublevels of the 2s²2p, 2s2p², 2p³, 2s²3l, 2s2p3l, 2p²3l (l = 0-2) configurations, a collisional-radiative model has been used for determining the populations of the upper magnetic sublevels of the lines. All required atomic data were computed with the Flexible Atomic Code. We find that the effect of anisotropy in the photon emission, due to the directionality of the incident electron beam, can lead to very significant differences between R(0°) and R(90°). Our results also indicate that the contribution from the ²D_{3/2}→ ²P_{3/2} line which blends with the ²D_{5/2} → ²P_{3/2} line enhances the effect of anisotropy.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 1; 128-129
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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