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    Wyświetlanie 1-3 z 3
    Tytuł:
    DLTS Investigations of (Ga,In)(N,As)/GaAs Quantum Wells before and after Rapid Thermal Annealing
    Autorzy:
    Gelczuk, Ł.
    Dąbrowska-Szata, M.
    Pucicki, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1195373.pdf
    Data publikacji:
    2014-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.Eq
    71.55.-i
    73.61.Ey
    Opis:
    Deep level transient spectroscopy was used to investigate deep-level defects in (Ga,In)(N,As)/GaAs triple quantum well structures grown by atmospheric pressure metalorganic vapor phase epitaxy with different indium and nitrogen contents and annealed in rapid thermal annealing system. A combination of electron traps that disappear or remain on annealing and a new hole trap that appears on annealing were detected. The revealed electron traps were attributed to N-related complexes or GaAs host-related native point defects. Moreover, it was suggested that the new hole trap observed in the annealed GaAsN/GaAs triple quantum well structure together with the dominant electron trap can act as generation-recombination center responsible for the observed a very poor optical quality among all the investigated multi-quantum well structures.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 5; 1195-1198
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Misfit Dislocations Study in MOVPE Grown Lattice-Mismatched InGaAs/GaAs Heterostructures by Means of DLTS Technique
    Autorzy:
    Gelczuk, L.
    Dąbrowska-Szata, M.
    Jóźwiak, G.
    Radziewicz, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2038268.pdf
    Data publikacji:
    2004-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.-i
    71.55.Eq
    71.20.Nr
    Opis:
    Two deep traps associated with lattice-mismatch induced defects in n-type In$\text{}_{0.042}$Ga$\text{}_{0.958}$As/GaAs heterostructures and three deep point traps were observed by means of DLTS method. In order to determine the overlapping DLTS-line peaks parameters precisely, high resolution Laplace DLTS studies werw performed. A simple procedure of distinguishing between point and extended defects in DLTS measurements was used.
    Źródło:
    Acta Physica Polonica A; 2004, 106, 2; 265-272
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Increase in Protein Contour Length Depends on Mechanical Unfolding Conditions
    Autorzy:
    Dąbrowska, A.
    Lebed, K.
    Lekka, M.
    Kulik, A.
    Forró, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813503.pdf
    Data publikacji:
    2008-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.14.Ee
    87.15.-v
    87.15.He
    87.15.La
    Opis:
    Many proteins in alive organisms have a domain structure providing them the possibility to reversible unfolding, which seems to play an essential role in those processes occurring in tissues which are controlled by mechanical cellular tension. In this work the atomic force microscopy was applied to investigate the mechanical properties of the single molecules of fibronectin, a protein participating in the important mechanical processes in extracellular matrix. The results showed that the conditions of mechanical stretching influence not only the force required to unfolding of a domain but also the increase in protein contour length induced by such unfolding event. Two mean values of the increase in length (called shortly the unfolding length) $L_1$ and $L_2$, were obtained and ascribed to unfolding of either the whole fibronectin domain of type III $(L_2)$ or its fragment $(L_1)$. Both unfolding lengths revealed similar dependence on the stretching conditions. This experimental observation of increase in unfolding length with increasing loading rate was successfully described with a combination of two theoretical models (Bell model and the worm-like-chain model), previously used separately in the analysis of protein unfolding. The general mechanical property of fibronectin domains was emphasized and proposed as a potential determinant of the cellular adhesion.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 2; 753-762
    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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